Properties Of Porous Concrete Research Articles

Optimizing Porous Concrete Using Granite Stone-Crushing Waste: Composition, Strength, and Density Analysis

This study examines the utilization of granite stone-crushing waste in the production of porous concrete, with a particular emphasis on the influence of aggregate composition and cement paste layer thickness on the material’s strength and density. Two types of aggregates were employed in this study: granite crushing screenings and granite crushed stone. The impact of aggregate grain size on the properties of porous concrete properties was investigated, and it was found that the use of granite screenings (2.5–5 mm) resulted in superior concrete characteristics compared to granite crushed stone (5–10 mm). This study puts forward a method for optimizing the composition of porous concrete to achieve an optimal balance of compressive strength and density. A method for the design of porous concrete was proposed, incorporating experimental results and the dependencies of strength on the water/cement ratio (W/C). Equations were developed to predict concrete strength based on W/C and cement paste layer thicknesses (CPLTs). The method provides preliminary mix proportions, which should be validated and adjusted for the final design. The findings demonstrate the potential for utilizing stone-crushing waste to produce environmentally sustainable and high-quality porous concrete.

Impact of Water Level Variation on Mechanical Properties of Porous Concrete

This paper investigates porous concrete and the influence of water level variations and porosity on the mechanical, physical, and hydraulic properties of porous concrete. The effect of different void percentages and various water levels on the properties of porous concrete was studied. Fabricated specimens with targeted porosities of 20% and 25% were subjected to a series of tests to evaluate their compressive strength, hydraulic conductivity (permeability), and porosity. The permeability of the specimens was assessed using a falling head permeameter to ensure effective water percolation. Porosity was quantified through a volumetric method, providing insights into void content. Both cubical and cylindrical specimens were used for all tests, along with compression tests under both air-dried and oven-dried conditions. The results showed that the maximum compressive strength occurred under oven-dried conditions for both cubical (7.05 MPa, 5.58 MPa) and cylindrical (8.36 MPa, 4.81 MPa) specimens, with 20% and 25% porosities, respectively. The compressive strength was found to be low in air-dried samples and increased with higher water levels, peaking at the 40% water level. Furthermore, the porosity exhibited a significant correlation with the reduction in density, affecting the mechanical properties. For the cylindrical and cubical samples, the dry density decreased by 16.03 kg/m3 and 20.85 kg/m3 and the permeability increased by 0.41 mm/s and 0.84 mm/s, respectively, for every 1% increase in porosity. The results showcased the effect of water level variation on porous concrete properties as well as its promising ability to infiltrate water. This promotes the development of sustainable pavement systems by minimizing surface runoff and aiding groundwater recharge.

Improving the Performance of Porous Concrete by Utilizing the Pumice Aggregate

The performance of porous concrete, widely used for storm-water management, can be compromised due to the limitations of conventional aggregates. This research investigates the potential of pumice aggregate, a lightweight volcanic material, to enhance the mechanical strength, durability, and permeability of porous concrete. A series of experimental tests were conducted to evaluate the effects of varying pumice aggregate content on the properties of porous concrete. The results demonstrate that the inclusion of pumice aggregate significantly improves the compressive strength, flexural strength, and freeze-thaw resistance of porous concrete. Moreover, the permeability of the concrete mixtures is enhanced, allowing for better storm-water infiltration. The favorable porous characteristics of pumice aggregate contribute to increased void content within the concrete, enhancing its water storage capacity and reducing runoff. These findings suggest that utilizing pumice aggregate can lead to the development of more sustainable and efficient porous concrete systems for storm-water management. The incorporation of pumice aggregate not only improves the mechanical and hydraulic performance of porous concrete but also offers environmental benefits by utilizing a lightweight and natural material. The findings of this research have significant implications for sustainable construction practices and the effective management of storm-water runoff.

Modeling of Strength Properties of Porous Concrete

According to previous research, porous concrete has lesser compressive strength than normal concrete and can only withstand mild traffic loads. The demand for high-strength porous concrete is urgent. By balancing the elements of porous concrete, high strength porous concrete may be produced. This may be accomplished by comprehending the complicated interaction between porous concrete's constituents. Using artificial intelligence approaches, the present research offers a study on the prediction of 7, 28-day compressive strengths and 28, 90- day flexural strengths of porous concrete. Random tree (RT), M5 Rules, REP Tree, and ensemble with Bagging were used to estimate the compressive strength of porous concrete in this work, and a comparison of performance and practicality of artificial intelligence result is shown. A total of 111 datasets were extracted from prior research and publications. As input parameters for modelling, cement, natural coarse aggregates, recycled coarse aggregates, water, silica fume, plastic/steel/rubber fibres, and density were employed. Properties such as mean absolute error, root mean square error, and correlation coefficient were used to evaluate and compare the behavior of projected models. The results demonstrated a high level of capacity and potential for predicting the compressive of porous concrete.

Fiber reinforced polymers in pervious concrete - a state of the art review

Porous concrete, entitled also as permeable or pervious concrete, is a type of concrete that has interconnected voids that allow water and also air to go across it. It is widely used in the construction of pavements, parking lots, and sidewalks, among other applications, because of its ability to reduce stormwater drainage, better quality of the water, and decrease urban heat island effects. The addition of fibers to porous concrete has been the subject of numerous studies in recent years, with researchers examining the effects of diversified types and amounts of fibers on the material’s properties. Fiber reinforcement can enhance the strength, durability, and ductility of porous concrete, making it more suitable for use in structural applications. Polymer fibers, in particular, have shown promise in improving the properties of porous concrete. They can increase the material’s resistance to cracking, improve its flexural strength, and enhance its heat-absorbing property. However, the characteristics of polymer-reinforced porous concrete are not yet fully understood, and more research is needed to determine the optimal types and amounts of fibers for specific applications. Despite the potential benefits of fiber-reinforced porous concrete, there are also some challenges associated with its use. The addition of fibers can increase the material’s cost and complexity of production, and it may also affect its permeability and drainage capacity.Fiber-reinforced porous concrete represents an exciting area of research and development in the field of civil engineering. While the addition of fibers can enhance the material’s properties, more research is needed to determine the optimal types and amounts of fibers for specific applications. By addressing these challenges and continuing to refine the material’s properties, fiber-reinforced porous concrete has the potential to expand its use in a large spectrum of applications, including structural engineering, transportation infrastructure, and environmental protection.

A dynamic system analysis study on the design of high-performance pervious concrete ratios

Abstract As permeable concrete contains more pores and larger pore size when improving its water permeability, it will affect its mechanical properties and durability, so it is of great significance to study the mixing ratio of porous concrete. Studying the mixing ratio of porous concrete is of great significance. The subject is studied in depth from the aspects of mechanical properties and water permeability, in order to prepare high-performance permeable concrete with high compressive strength and meet the requirements of infiltration. Firstly. Optimization of the performance of raw materials and mixing ratios of porous concrete, according to the aggregate gradation, aggregate particle size, and other factors on the mechanical properties of porous concrete, to determine its optimal aggregate mixing ratio. Three groups of high-performance pervious concrete specimens with different aggregate particle sizes and pore structures were examined for their real fine structure. Finally, after the preparation of high-performance pervious concrete was completed, the porosity, fractal dimension, equivalent diameter, contour coefficient, and roundness of the specimens were tested to investigate the effects of several factors mentioned above on the permeability coefficient and compressive strength properties of pervious concrete. The results show that the two-dimensional pore diameter is normally distributed, the diameter size is centrally distributed in the range of 0~10mm, and the number of pores in this range accounts for more than 70%. Gradually increasing aggregate particle size leads to an increase in the proportion of large pores inside the specimen. After the compressive strength test and porosity test, it was found that the water permeability coefficient of the porous concrete was the best for the single-grain limestone aggregate with the equivalent diameter range of 5~8mm. The results of this study have theoretical value in enriching and developing high-performance permeable concrete.

Effect of aggregate gradation on the mechanical strengths and permeability properties of porous concrete

Porous concrete (PC) is a very popular construction material in developed countries and is now finding application in India in parking lots. In this investigation, an effort was made to study the various performances of PC in the laboratory. Different gradations of coarse aggregates namely 4.75–10 mm, 10–12.5 mm, and 12.5–16 mm are considered to characterize PC adopting conventional compaction by tamping rod, additional 5 and 10 compactions by proctor hammer. The effect of varying compaction and the coarse aggregate gradation is studied on axial compressive, flexural tensile, and splitting tensile strengths of PC. In addition, a simple method is proposed to determine the permeability of all PC mixes. The work was extended to know the influence of low-grade fly ash and GGBS as supplementary cementing materials (SCMs) on the strengths and permeability of PC. Though the strength of PC in the presence of SCMs has decreased, the permeability and the estimated porosity of all mixes decreased compared to the 100% cement counterpart. A wide range of PCs were developed to suit several combinations of mechanical strength, density, and permeability depending on the type of application leading to a sustainable solution. The simple test method proposed to determine the permeability of the PC gives satisfactory results.

The impact of multi-walled carbon nanotubes on the mechanical and environmental properties of porous concrete in removing pollutants for use in surface runoffs

Surface water is commonly acknowledged as the most polluted among the several water sources available. The principal pollutants consist of various industrial toxins, organic dyes, and heavy metals, specifically found in surface runoffs. The potential for enhancing water quality through the extraction of pollutants from runoff appears promising with the implementation of porous concrete, in conjunction with other additives. This study investigates the impact of varying quantities of coarse and fine aggregates, with variable water-to-cement ratios, on the mechanical properties of concrete. Furthermore, the effectiveness of MWCNT in the removal of chemical oxygen demand (COD) and the dye pollutant methylene blue via surface absorption and production cost are examined in this research. The results reveal that the MWCNT had significant effectiveness in removing COD and dye pollutants from surface runoff water. The greatest rate of COD removal observed was 71.34 %, while the maximum percentage of dye removal was 91.89 %. In addition, the integration of MWCNTs into the porous concrete matrix yielded improved mechanical characteristics, indicating a positive influence of this addition. Concerning the cost of samples, the inclusion of MWCNT resulted in an increase in the overall cost. However, the utilization of porous concrete pavements offers a promising prospect for cost savings, and with advancements in water purification and mechanical qualities, this method has considerable benefits.

A Study on Effect of Mustard Husk Ash on Properties of Porous Concrete

Abstract: Mustard Husk Ash (MHA), a by-product of the mustard oil extraction process, has gained attention as a potential supplementary cementitious material in the construction industry. The incorporation of MHA in porous concrete offers the dual benefits of waste management and sustainable construction practices. The environmental advantages of utilizing MHA, such as reducing landfill waste and conserving natural resources. The review paper synthesizes the findings from various research studies that have investigated the influence of RHA on the properties of porous concrete. The impact of different percentages of Rice Husk Ash (RHA) as a partial replacement for cement is analysed. The fresh and hardened properties of porous concrete, including workability, compressive strength, water absorption, and porosity, are examined in light of the incorporation of RHA. The review paper identifies key trends and observations from the existing literature. It discusses the influence of water content and size of coarse aggregates on the performance of RHA-based porous concrete. It also addresses the challenges and limitations associated with the use of RHA, such as its effect on the water demand and workability of concrete mixes. By synthesizing the collective findings, the review paper provides valuable insights into the effectiveness and feasibility of RHA as a sustainable alternative in porous concrete production. It identifies knowledge gaps and areas for further research, emphasizing the need for long-term durability studies and performance assessments on MHA based on porous concrete under different environmental conditions. In conclusion, this review paper contributes to the understanding of the effect of mustard husk ash on the properties of porous concrete. It underscores the potential of MHA as a viable option for enhancing the sustainability and performance of porous concrete. The comprehensive analysis serves as a valuable resource for researchers, engineers, and practitioners seeking to explore the application of MHA in porous concrete and promote environmentally friendly construction practices.

Strength, Porosity and Permeability Properties of Porous Concrete Made from Recycled Concrete Aggregates

Due to expansion in infrastructure and increased development of urbanization in Ethiopia, most of the places are covered either by impermeable cement concrete or bitumen that blocks the percolation of water from rainfall. A porous concrete made of zero fine aggregates, creating a pore that permits the concrete to be water permeable, is highly desirable. Similarly, the demand for natural coarse aggregates remains high, while natural resources are being depleted. Therefore, this study aims to investigate the properties of porous concrete using recycled concrete aggregate as a partial replacement for natural coarse aggregate. Experimental tests were conducted on cement setting time, workability of concrete, compressive, split tensile, porosity, and permeability of porous concrete. The properties of porous concrete at different ratios—0, 15, 30, 45 and 60%—revealed that RCA is suitable for use as coarse aggregate. The optimum replacement percentage of recycled aggregate for porous concrete in terms of strength is 30%, with 28th-day compressive strength of 17.37 MPa. However, slight increments were observed in porosity and permeability coefficient. Therefore, the concrete produced in this study is structural concrete, which is suitable for walkways and other concrete flat works, whereby heavy vehicle traffic loads do not exist.

Study of water intrusion in admixture concrete using neutron backscattering technique

This work aims to study the water infiltration in ordinary concrete with different percentages of super-plasticizer (SP) varied from 0.25% to 1.5% of cement weight. It was performed by measuring thermal neutrons backscattered from the investigated samples. Dynamic measurements were carried out by fixing the sample on a transfer table in front of the neutron beam exit. A slit collimated beam of neutrons emitted from 252Cf was hit on which surface of the sample water did not infiltrate through it and along the flow direction.Further, static measurements were made using collimated neutron beams of thermal and fast neutrons emitted from sources of 252Cf and Pu-Be with strength of 1.3 × 107 and 5 × 106 n/s respectively. These beams of neutron incident on the other side of sample which water allowed infiltrating for 7, 14, 21, 28, and 35 days. The backscattered thermal neutrons were measured by BF3 detector which fixed on the same side of the incident neutron beam. The obtained results show clearly the dependence of water infiltration on the percentages of SP and the submerged time. As well as, the measuring sensitivity depends on the main energy of the incident neutrons, submerged time, and SP% was given and discussed. The results indicated that samples with SP below 1.5% show an improvement in resistivity to water infiltration and therefore prolong the concrete durability for marine constructions. The best percentage of SP is 1%, for more percentages, there is a negative effect on the permeability and diffusivity. As well as, the obtained results indicated that, NBS is a powerful, nondestructive, and fast method to observe water infiltration in porous materials. In addition, these results lead to improve concrete properties to prevent fluid intrusion. Further investigation should be done with different recycled additives to achieving the optimization between waste reuse and engineering properties of porous concrete.

Physical and Hydraulic Properties of Porous Concrete

The work presented includes a review of the state of art of porous concrete. Its purpose is to evaluate the potential use of porous concrete in constructions where the level of surface runoff justifies it. A review of the literature presented here has been necessary where parameters of special consideration have been defined in the dosage of permeable mixtures. The study includes the definition of porous concrete in terms of its main components: cement, coarse aggregate, water, additives, and sand, in little or no quantity, to cause the generation of an effective content of interconnected voids that allow rapid storm drainage. Given the reports of variables of high incidence in the mechanical behavior of porous concrete (resistance/permeability relationship), an investigation is warranted to synthesize the effects of the variables in the preparation of the mixture: water–cement ratio, granulometry, and morphology of the aggregates, compaction pressure, and curing techniques, among others. Likewise, the protocols for the characterization of porous concrete and additional aspects relevant to support the experimental phase are exposed, constituting a reference or anchor point for developing technologies associated with the manufacture of this material and the possibilities of its implementation in constructions.

Prediction Model for Compressive Strength of Porous Concrete with Low-Grade Recycled Aggregate.

As the first batch of products after the resource utilization of construction and demolition waste, low-grade recycled aggregate (RA) has not been fully utilized, which hinders the development of the comprehensive recycling industry of construction waste. Therefore, this paper studies the mechanical properties of porous concrete (POC) with low-grade RA. An improved relationship between porosity and compressive strength of brittle, porous materials is used to express the compressive strength of POC with recycled aggregate (RPOC), and the prediction for compressive strength of porous concrete with low-grade RA is constructed by analyzing the mechanism of compressive damage. The results show: the compressive strength of porous concrete decreases with the addition of low-grade recycled aggregate, but the effect is not obvious when the replacement rate is less than 25%. The error range of the relationship between porosity and compressive strength of RPOC is basically within 15% after improvement. The prediction model for compressive strength based on the ideal sphere model of aggregate can accurately reflect the compressive strength of porous concrete with low-grade RA. The results of this study can provide a reference for the staff to learn about the functional characteristics of recycled products in advance and provide security for the actual project.

Effects of specimen shape and size on the permeability and mechanical properties of porous concrete

Porous concrete, which is generally considered as an environment-friendly pavement, plays an important role in sponge city. However, measuring its strength and permeability with different specimen shapes and sizes has not been paid enough attention by the researchers. Therefore, the effects of the size and shape on the permeability and mechanical properties of porous concrete were investigated in this paper. Thus, two types of aggregates and three types of cement were selected to cast different mixtures in different molds (two sizes of cylindrical and cuboid specimens). All porous concrete specimens were tested to evaluate the influence of shape and size on the permeability of porous concrete firstly. Then the different cube and cuboid specimens were nominated to measure the compressive strength and flexural strength of porous concrete respectively. Two different sizes of cylindrical specimens were selected to test the compressive strength and splitting strength. The results show that porosity, aggregate size, aggregate type, cement grade could affect the strength of porous concrete. Moreover, the compressive strength, flexural strength, splitting strength of the porous concrete with two different sizes, and the compressive strength and splitting strength with different shapes are significantly different.

Studying the mix design and investigating the photocatalytic performance of pervious concrete containing TiO2-Soaked recycled aggregates

Demolished concrete, as one main form of construction and demolition wastes, has been widely studied of being utilized as recycled aggregates (RAs) in new concrete production. However, existing studies of applying RAs have been limited to the mechanical and durability issues of cementitious composites containing RAs. There has not been sufficient research of adopting RAs in cementitious products to also address the environmental sustainability. On the other hand, existing research utilizing cementitious products (e.g., concrete pavement) for air purification purpose have not adequately considered RA usage. Aiming to address the two sustainable objectives (i.e., waste diversion and air purification) simultaneously in concrete mix, this research adopted a two-step approach. Firstly, we studied and identified the optimal mix design of pervious concrete containing TiO2-soaked recycled coarse aggregates (RCAs) in order to achieve the higher compressive strength; secondly, we investigated the photocatalytic performance of pervious concrete containing RCAs coated with TiO2 photocatalysts. The photocatalytic performance of pervious concrete was also tested by applying a 10-min heavy rainwater wash. Experimental test results revealed that the internal voids of adhered mortar enabled RCAs to absorb more TiO2 particles. The NO degradation rate of TiO2-soaked RCAs increased from 71.4% to 80.6% when RCAs’ size decreased from 15-20 mm to 5–10 mm. The orthogonal experimental investigation indicated that water-to-binder ratio had the most significant effect on concrete compressive strength, followed by ratio of RCAs to binder, and replacement ratio of RCAs to natural aggregates. The optimized mix design for pervious concrete containing RCAs was identified to achieve highest strength (i.e., water-to-binder ratio at 0.35, coarse aggregate-to-binder ratio of 3 by mass, fly ash replacement rate to Portland cement at 5%, and 50% replacement ratio of RCAs to NCAs). The concentration of TiO2 solution at 0.3% was identified as the optimal ratio to achieve the highest NO degradation rate at 70% before rainwater wash. The NO degradation rates of pervious concrete still reached nearly 50% after 10-min heavy rainwater wash, indicating that pervious concrete using RCAs coated with TiO2 could largely maintain its photocatalytic capacity. This study addresses two main social and environmental issues in developing countries (e.g., China), namely overwhelming amount of construction & demolition wastes being generated, and air pollution. It leads to the cleaner production in concrete pavement construction by achieving the optimization between waste reuse, air purification, and engineering properties of porous concrete.

Effect of cement replacement by fly ash and epoxy on the properties of pervious concrete

Permeable concrete has strong drainage and can recharge groundwater, making it a common semi-rigid road base material. Over the last decade, authors have focused on the properties of porous concrete with pozzolanic admixtures. The number of studies on the mechanical properties of pervious concrete made through the replacement of pozzolanic materials with cement is quite limited. Unfortunately, researchers have not focused on utilizing additional admixtures to improve the properties of pervious concrete made with high volumes of pozzolanic replacement. This paper focuses on the effect of using epoxy to partially replace cement on the mechanical properties of permeable concrete made with a significant amount of cement replaced by fly ash. A comparison between the addition and non-addition (15%) of sand as a partial replacement for gravel was investigated and the effect of increased gravel to sand ratios on the properties of porous concrete was also studied. This paper showed a slight decrease in porosity due to epoxy replacement compared to an increase in porosity by other mechanical properties. There was an increase in strength when epoxy replacement reached above 45% as well as a marginal decrease in strength and modulus of elasticity with (50%) fly ash replacement. There was also an increase in strength due to (15%) gravel replacement by sand of above 40%, with a reduction in strength with increased gravel to sand ratios.

Influence of BOF and GGBFS Based Alkali Activated Materials on the Properties of Porous Concrete.

In this study, environmentally friendly ground granulated blast furnace slag (GGBFS) based alkali activated materials and basic oxygen furnace slags (BOFs) were used as bonding materials and aggregates, respectively, to produce novel, environmentally friendly GGBFS based porous concrete. Porous concrete with a particle size of 4.75–9.5 mm and 9.5–19.00 mm was used as an aggregate. The “liquid-to-solid ratios” (L/S) variable was set at set at 0.5 and 0.6, and the “percentage of pore filling paste ratio” variable was controlled at 40%, 50%, and 60%. The curing period was set at 28 d, and the relationship between connected porosity and permeability, as well as that between unit weight and the pore filling paste ratio percentage were explored using analysis of variance. The results showed that the porous concrete had a maximum compressive strength of 8.31 MPa. The following results were obtained. An increase in percentage of pore filling paste ratio increased compressive strength. Permeability was measured at 4.67 cm/s and was positively correlated with porosity. An increase in porosity increased permeability, in which porosity was positively correlated with the percentage of pore filling paste ratio. The maximum splitting strength achieved during the 28 d was 1.46 MPa, showing a trend similar to that of compressive strength.

Analysis of thermal conductivity of porous concrete using laboratory measurements and microstructure models

Porous concrete pavement has been used to alleviate urban heat island (UHI) effect in the near-surface temperature field. Due to high porosity and heterogeneity, thermal properties of porous concrete may vary depending on the microstructure of aggregates and air voids. This paper developed an innovative method to calculate the effective thermal conductivity of porous concrete considering two-dimensional (2-D) heterogeneous microstructure. An image-aided approach was used to randomly generate the three-phase (aggregates, cement paste, and air) microstructure model of porous concrete. Finite-element (FE) models were developed to calculate thermal conductivity of porous concrete by simulating the steady heat transfer process. Laboratory experiments were conducted to measure thermal conductivity of porous concrete and its components. The prediction results were compared to experimental measurements and close agreements without statistical differences were observed. The effects of microstructure feature on thermal conductivity of porous concrete were studied. Although the thermal conductivity of porous concrete decreases as the porosity increases in general, the variation of thermal conductivity is affected by the tortuosity and orientation of air void and aggregate contacts. The study findings clearly indicate that the heterogeneous microstructure of porous concrete need be considered for accurate prediction of thermal transport behavior.

Application of Talc as an Eco-Friendly Additive to Improve the Structural Behavior of Porous Concrete

Talc is an eco-friendly material used in various domains. In this study, talc, quartz and lime sand were added for improving the performance of porous concrete. For this, talc/quartz and lime sand were used as substitute with 5–30% and 5–15% of aggregates, respectively. Compressive strength, porosity and permeability of the porous concrete blocks and their draining capacity were the tested characteristics. Results showed that although by increasing the amount of talc, quartz and lime sand, compressive strength was improved, permeability and porosity were reduced. However, despite the significant difference in hardness of talc and quartz, mixtures containing talc had acceptable performance and were close to quartz so that the average compressive strength of talc samples was only 0.4 MPa less than the quartz ones. It was also found that threshold value for the addition of talc to increase the strength of porous concrete was 25% and over this rate makes no difference in resistance and even reduces it. Results also revealed that all mixtures had good performance in drainage of synthetic urban runoff—the least-permeable talc sample drained 40-mm runoff in 69 s. Also, the most impermeable quartz specimen drained the 40-mm runoff in 44 s. Generally, the mentioned results indicated that talc, as an eco-friendly additive, had acceptable performance in improving the properties of porous concrete.

Using Waste Vermiculite and Dolomite as Eco-Friendly Additives for Improving the Performance of Porous Concrete

The present study investigated the applicability of waste vermiculite and dolomite as fine aggregate, known as appropriate mineral adsorbents to enhance the quality of urban runoff, for improving the mechanical properties of porous concrete. 180 samples were mixed by adding 5-30% vermiculite and dolomite, as fine aggregate, and combining them with ordinary sand; lime sand (combining of 5-15% of each). Results showed that although adding dolomite culminated in a minor reduction of permeability– average of about 30%-, the average of compressive strength was augmented by 120%. Results of compressive strength of dolomite samples were repeated in mixtures containing vermiculite (an increase of 57%). While exploiting vermiculite in high percentages (20, 25, and 30) resulted in an extensive decrease in the permeability (94%), it was improved to an acceptable level (about 40%) after using vermiculite in combination with ordinary sand (lime sand). All dolomite and improved vermiculite mixtures, after combining vermiculite with ordinary sand, had appropriate performance in draining storm-urban runoff; such that in the weakest case, stimulated storm runoffs with heights of 10, 20, 30 and 40 cm were completely drained only after 17, 36, 59 and 87 seconds, respectively. Also, using vermiculite resulted in reducing the concrete weight (about 100 kg). Generally, although a little reduction in the permeability was seen, but using waste vermiculite and dolomite improved the mechanical properties of porous concrete significantly.