Compressive Strength Properties Research Articles

Application of High-performance Concrete in Civil Engineering

With the continuous improvement of modern civil engineering performance requirements on building materials, high-performance concrete (High-Performance Concrete, HPC) has become one of the key materials. This paper discusses the application of HPC in various civil engineering, and its innovative impact. HPC has played a key role in many major engineering projects for its extraordinary durability, high intensity and excellent working nature. First, the paper introduces the basic composition and performance characteristics of HPC, including its compressive strength, durability and rheological properties. The optimized formulation of HPC reduces the use of cement, and cement production is one of the major sources of carbon emissions. By using fly ash, silicon ash and other industrial by-products to replace part of the cement components, HPC not only improves its environmental friendliness, but also enhances the comprehensive performance of the material. Finally, the paper prospects the potential development of HPC in future civil engineering. With technological advances and increasing demand for environmentally friendly building materials, the improvement and application of HPC will continue to expand.

Experimental study on bond behavior of steel bar embedded in thin UHPC

Due to the high compressive strength and excellent tensile properties of UHPC, reinforced UHPC with a thickness of 45 mm–60mm and a concrete cover of 15 mm–19mm has been used in the steel-UHPC lightweight composite deck. However, the researches about the bond behaviors of steel bar in UHPC with the concrete cover less than 20 mm were still limited. This paper aimed to study the bond behaviors of steel bars in UHPC with a thinner concrete cover (≤20 mm) and develop the calculation method for the lower bound of bond strength. A program of pullout test was conducted using the tensile test setup mimicking the tensile stress condition of structural members. The effects of concrete cover (10 mm, 15 mm and 20 mm), steel fiber volume fraction (0.5%, 1% and 2%), steel bar diameter (10 mm, 12 mm, 14 mm and 16 mm), embedment length of steel bar (4db, 6db, 8db, 10db) on the bond behaviors of steel bar in UHPC were investigated through 11 groups of pullout test specimens. The test results showed that most specimens failed in concrete cover splitting and the bond strength was influenced to different degrees by the test variates. The bond strength for steel bar in UHPC with a steel fiber volume fraction of 2% varied from 12.29 MPa to 15.88 MPa, and an embedment length of 8db with a concrete cover of 15 mm could ensure the steel bar with a diameter less than 16 mm reached its nominal yield stress of 400 MPa before the bond failure. On the basis of pullout test results in this study and the published test data, an empirical equation was proposed to predicted the lower bound of bond strength for steel bar in UHPC.

Utilization of wollastonite, jarosite, and their blends for the sustainable development of concrete paver block mixes containing reclaimed asphalt pavement aggregates.

While several research studies considered the utilization of reclaimed asphalt pavement (RAP) aggregates for asphalt and concrete pavements, very few attempted its possible utilization for precast concrete applications like concrete paver blocks (CPBs). Moreover, few attempts made in the recent past to improve the strength properties of RAP inclusive concrete mixes by incorporating certain supplementary cementitious materials (SCMs) have reported an insignificant or marginal effect. The present study attempts to comprehensively investigate the utilization potential of some locally and abundantly available materials having suitable physicochemical properties to improve the performance of a zero-slump CPB mix containing 50% RAP aggregates. The studied filler materials, namely, wollastonite (naturally occurring calcium metasilicate mineral) and jarosite (hazardous zinc industry waste), were used to replace 5-15% and 10-20% by volume of Portland cement in the 50% RAP CPB mix. Apart from their individual effects, the efficacy of wollastonite-jarosite blends was also investigated. Considering the lack of indoor storage facilities and economic aspects of CPBs, the influence of water spray curing regime on the performance of the RAP CPB mixes was studied and compared to that of continuous water curing regime. Inclusion of the considered fillers was found to statistically and significantly enhance the flexural strength, tensile splitting strength, and abrasion resistance of the 50% RAP CPB mix; however, the compressive strength (in most cases), permeable voids, water absorption, and water permeability properties showed an insignificant improvement. Results of thermogravimetric analysis confirmed the occurrence of pozzolanic reactivity, and microstructure analysis revealed improvements in packing of concrete matrix and ITZ with filler inclusion qualitatively substantiating the improvements in strength and durability characteristics. The toxicity characteristics of heavy metals that may leach from the hazardous jarosite-based RAP CPB mixes were found to be within permissible limits. Based on the performance requirements specified by IS, IRC, and ASTM standards, all the RAP CPB mixes with filler inclusions fulfilled the acceptance criteria for heavy traffic applications, and water spray curing can enact as an alternate method for curing these mixes. However, to avail maximum performance benefits, it is recommended to use 5% wollastonite, 15% jarosite, and a combination of 10% wollastonite and 10% jarosite as a Portland cement substitute to produce sustainable eco-friendly RAP CPB mixes.

Experimental study on the effect of polypropylene fiber on compressive strength and fracture properties of high-strength concrete after elevated temperatures

Polypropylene fibers improve the toughness of concrete and reduce the susceptibility of high-strength concrete (HSC) to high temperature spalling. And the mechanical properties of polypropylene fiber reinforced concrete (PFRC) become important after exposure to high temperatures, especially in situations related to engineering uses or repairing concrete structures damaged by fire. This paper presents an experimental study on the compressive strength and fracture properties of PFRC experiencing different temperatures with different fiber contents and lengths. It was shown that the fracture path of concrete becomes longer after experiencing high temperatures. The rate of debonding of mortar and coarse aggregate increases with the temperature rising. The compressive strength of concrete and the peak load and fracture energy of three-point bending beams were both increased by the addition of polypropylene fibers at room temperature, and the compressive strength increased with the increase of fiber content. The addition of polypropylene fibers is able to increase the compressive strength of concrete compared to the control group at experiencing temperatures less than 300 oC. The peak forces of the three-point bending of the concrete beams all show a decreasing trend with the increase in the experienced temperature. The initial slopes of the rising part of the force-loading point displacement and force-crack mouth opening displacement (CMOD) curves all decrease with increasing of temperature, and curves gradually become slower. Addition of polypropylene fibers decreases the peak force of concrete after high temperature. There is no significant pattern in the effect of polypropylene fiber content and length on the peak force and fracture energy of concrete three-point bending beams.

Optimization of Controlled Low-Strength Material from Multi-Component Coal-Based Solid Waste

Recently, controlled low-strength material (CLSM) has been considered an easy-to-mix material, and the raw material is usually derived from solid waste, suggesting lower production costs. Moreover, the resource utilization of waste fosters the sustainable advancement of both society and the environment. In the present work, a CLSM with excellent performance was developed by adopting fly ash, bottom ash, desulfuration gypsum, and cement as the main cementitious materials, as well as gasification coarse slag and coal gangue as aggregates. An orthogonal experiment with three factors and three levels was designed according to the ratio of cement to binder, the contents of water, and the water-reducing agent. Further, the macroscopic properties of flowability, dry density, bleeding, compressive strength, fresh density, porosity, and absorption rate of the CLSM mixtures were tested. To optimize the CLSM proportion, the ranges of three indicators of CLSM were calculated. Experimental results manifested that the fresh and dry densities of the mixtures were within the range recommended by ACI 229. The optimal levels of cement–binder ratio (i.e., the ratio of cement to binder), water content, and water-reducing agent content are 0.24, 248 kg·m−3, and 0.80 kg·m−3, respectively. Under this condition, the flowability was 251 mm, the bleeding was 3.96%, and the compressive strength for 3 d, 7 d, and 28 d was 1.50 MPa, 3.06 MPa, and 7.79 MPa, respectively. Furthermore, the leaching values of eight heavy metals in CLSM and raw materials were less than the standard requirements, indicative of no leaching risk.

Arriving the optimum retarder dosage level of sugar on the setting time, compressive strength, and microstructure property of Portland pozzolana cement

AbstractCement and concrete are the most crucial and dominating engineering materials in the construction sector. Cement serves as an excellent binder for concrete and when it is treated under unusual conditions either to satisfy accelerating or retarding requirements by the construction industries, admixtures role comes into the effect. The construction industry has been searching for retarding admixtures and the optimal dosage level, particularly for ready mix concrete applications. Generally the retarding admixtures such as organic retarders (lignosulphonates, hydroxycarboxylic acids and their salts, phosphonates, sugars) or inorganic retarders (phosphonates, borates) were generally used to reduce the speed of the reaction between cement and water by altering the growth of the hydration products and/or limiting the rate of water penetration to the cement particles. The research was still in its infancy stage in terms of determining not just the appropriate dosage amount, but also the ideal retarder materials for the aforementioned uses. In considering this industrial need, an attempt was made on utilizing the usage of sugar in the concrete to study the retarding effect without affecting the strength properties of cement. The sugars usage levels were at 5, 10, 15, and 20% of the usage of cement to investigate consistency, setting time, compressive strength and micro structure properties at the curing age of 7, 14 and 28 days on the mortar specimens. The conclusions of the study reported that setting time was extended with increase of the dosage levels of sugar. However in considering the strength property, less than 5% of sugar dosage level can be better for the application as retarding agent in the industry applications.

Comparative study of fresh phosphogypsum treatment by sulfuric acid and neutralization with NaOH and CO2

AbstractThe newly formed, fresh phosphogypsum (PG) at the filter cake of the Dinh Vu Diamoni photphate DAP fertilizer factory was studied and treated with dilute sulfuric acid. The impurities were removed by sulfuric acid treatment and the carbonatation by NaOH and CO2 to create calcium carbonate. The results showed that fresh PG at filter cake contained the P2O5 total of 1.38%, and the phosphorus pentoxides effectively were removed at 69.32%. The acid‐treated PG was neutralized by NaOH and CO2 aeration, creating CaCO3 in situ nano‐microparticles identified by scanning electron microscopy (SEM) images and CaCO3 intensity by X‐ray diffraction (XRD). In this study, the cement mortar test, which used treated PG from both sulfuric treatment and NaOH neutralization within CO2 aeration, has better compressive strength properties and hydration supported by SEM images, XRD results, and thermogravimetric analysis.

Enhanced fresh and hardened properties of foamed concrete modified with nano-silica

Nowadays, the application of nanotechnology has gained increased attention in the concrete technology field. Several applications of concrete require light weight; one such concrete used is foamed concrete (FC), which has more voids in the microstructure. In this study, nano-silica (NS) was utilized, which exhibits a pozzolanic nature, and it reacts with other pozzolanic compositions (like lime, alumina, etc.) to form hydrated compounds in concrete. Apart from these hydrated compounds, NS acts as a filler material and enhances properties of concrete such as the fresh and hardened properties. This research examines the fresh, hardened, and microstructural properties of FC blended with NS. The ratio of binder and filler used in this research is 1:1.5, with a water-to-binder ratio of 0.45 and a density of 880 kg/m3. A total of six different weight fractions of NS were added to FC mixes, namely 0%, 1%, 2%, 3%, 4%, and 5%. Properties assessed for FC blended with NS were the slump, bulk density, strength parameters (flexural, splitting tensile, and compressive strengths), morphological analysis, water absorption, and porosity. It was concluded from this study that the optimum NS utilized to improve the properties was 3%. Apart from this, the relationship between the mechanical properties and NS dosages was developed. The correlations between the compressive strength and other properties were analyzed, and relationships were developed based on the best statistical approach. This study helps academicians, researchers, and industrialists enhance the properties of FC blended with NS and their relationships to predict concrete properties from other properties.

A Study on Compressive Strength and Micro Structural Properties of Magnesium Oxychloride Cement Concrete Under Varying Temperatures of Magnesium Oxide

Abstract: Construction is a huge consumer of natural resources and a considerable contribution in terms of CO2 emissions. Manufacturing cement and construction materials was shown t be source of the most greenhouse gas emissions. This study looks at whether magnesium oxychloride cement (MOC) may be used as a concrete alternative to standard Portland cement to lessen the environmental effect of the building sector. The research process involves a thorough review of the literature, an experimental investigation, and an internal structural analysis based on the optimal molar ratio. In this investigation, MOC cement concrete was mixed with magnesium powder at varied temperatures. The use of heated magnesium oxide powder produces the first set of results. Finally, a change was made to increase compressive strength of MOC cement concrete. To stimulate the reaction or gel formation, heat was applied to MgO powder at various temperatures and added to the manufacturing of MOC cement to improve the compressive strength. The molar ratio is chosen from the journal for optimum mixing and simple casting of concrete cubes. SEM and EDAX are utilized to analyze the microstructure of the various raised temperature samples. The MgO, phases 3 and 5, are apparent as double and triple ribbons with shared boundaries with water molecules and chloride anions in the SEM images, showing that the strength has increased due to these phases. EDAX shows the proportion of elemental weight in the sample

Three-Dimensional Extrusion Printed Urinary Specific Grafts: Mechanistic Insights into Buildability and Biophysical Properties.

The compositional formulations and the optimization of process parameters to fabricate hydrogel scaffolds with urological tissue-mimicking biophysical properties are not yet extensively explored, including a comprehensive assessment of a spectrum of properties, such as mechanical strength, viscoelasticity, antimicrobial property, and cytocompatibility. While addressing this aspect, the present work provides mechanistic insights into process science, to produce shape-fidelity compliant alginate-based biomaterial ink blended with gelatin and synthetic nanocellulose. The composition-dependent pseudoplasticity, viscoelasticity, thixotropy, and gel stability over a longer duration in physiological context have been rationalized in terms of intermolecular hydrogen bonding interactions among the biomaterial ink constituents. By varying the hybrid hydrogel ink composition within a narrow compositional window, the resulting hydrogel closely mimics the natural urological tissue-like properties, including tensile stretchability, compressive strength, and biophysical properties. Based on the printability assessment using a critical analysis of gel strength, we have established the buildability of the acellular hydrogel ink and have been successful in fabricating shape-fidelity compliant urological patches or hollow cylindrical grafts using 3D extrusion printing. Importantly, the new hydrogel formulations with good hydrophilicity, support fibroblast cell proliferation and inhibit the growth of Gram-negative E. coli bacteria. These attributes were rationalized in terms of nanocellulose-induced physicochemical changes on the scaffold surface. Taken together, the present study uncovers the process-science-based understanding of the 3D extrudability of the newly formulated alginate-gelatin-nanocellulose-based hydrogels with urological tissue-specific biophysical, cytocompatibility, and antibacterial properties.

Enhanced Hemostatic and Procoagulant Efficacy of PEG/ZnO Hydrogels: A Novel Approach in Traumatic Hemorrhage Management.

Managing severe bleeding, particularly in soft tissues and visceral injuries, remains a significant challenge in trauma and surgical care. Traditional hemostatic methods often fall short in wet and dynamic environments. This study addresses the critical issue of severe bleeding in soft tissues, proposing an innovative solution using a polyethylene glycol (PEG)-based hydrogel combined with zinc oxide (ZnO). The developed hydrogel forms a dual-network structure through amide bonds and metal ion chelation, resulting in enhanced mechanical properties and adhesion strength. The hydrogel, exhibiting excellent biocompatibility, is designed to release zinc ions, promoting coagulation and accelerating hemostasis. Comprehensive characterization, including gelation time, rheological properties, microstructure analysis, and swelling behavior, demonstrates the superior performance of the PEG/ZnO hydrogel compared to traditional PEG hydrogels. Mechanical tests confirm increased compression strength and adhesive properties, which are crucial for withstanding tissue dynamics. In vitro assessments reveal excellent biocompatibility and enhanced procoagulant ability attributed to ZnO. Moreover, in vivo experiments using rat liver and tail bleeding models demonstrate the remarkable hemostatic performance of the PEG/ZnO hydrogel, showcasing its potential for acute bleeding treatment in both visceral and peripheral scenarios.

Influence mechanism of mineral composition ratios on the early anchorage properties for cement anchoring agents

The utilization of cement anchoring agents has attracted significant attention in engineering applications such as tunnel support, primarily due to its high early strength and cost-effectiveness. Three different mineral composition ratios of cement anchoring agents were prepared in this paper for enhancing anchoring properties. The effects of mineral composition ratios on setting time, compressive strength, and early tensile pull-out properties of cement anchoring agents were thoroughly investigated. Based on hydration heat, hydration products composition and content, and microstructural evolution, the influence mechanism of mineral composition ratios on cement anchoring agents were discussed. Results show that the mineral composition ratios significantly affect the setting time and mechanical properties of cement anchoring agents. Excess alumina and filler content delays the setting time of cement anchoring agents, which is not conducive to the development of early strength. MC (the mass ratio of calcium oxide to alumina is 11.06) demonstrates a tensile pull-out strength that is 18% greater than MA (the mass ratio of calcium oxide to alumina is 5.67) and 55% higher than MB (the mass ratio of calcium oxide to alumina is 5.55). Moreover, its compressive strength is 6.88% higher than MA and 25.17% higher than MB after casting one day. MC boasts elevated hydration heat and a higher content of hydration products. These hydration products effectively bind together, thereby improving the interface adhesion between the steel bar and the cement anchoring agents. This study enhances our comprehension on how mineral composition ratios influence the early fundamental properties of cement anchoring agents, which also provides new avenues for designing high-performance cement anchoring agents.

Direct Pellet Three-Dimensional Printing of Polybutylene Adipate-co-Terephthalate for a Greener Future.

The widespread use of conventional plastics in various industries has resulted in increased oil consumption and environmental pollution. To address these issues, a combination of plastic recycling and the use of biodegradable plastics is essential. Among biodegradable polymers, poly butylene adipate-co-terephthalate (PBAT) has attracted significant attention due to its favorable mechanical properties and biodegradability. In this study, we investigated the potential of using PBAT for direct pellet printing, eliminating the need for filament conversion. To determine the optimal printing temperature, three sets of tensile specimens were 3D-printed at varying nozzle temperatures, and their mechanical properties and microstructure were analyzed. Additionally, dynamic mechanical thermal analysis (DMTA) was conducted to evaluate the thermal behavior of the printed PBAT. Furthermore, we designed and printed two structures with different infill percentages (40% and 60%) to assess their compressive strength and energy absorption properties. DMTA revealed that PBAT's glass-rubber transition temperature is approximately -25 °C. Our findings demonstrate that increasing the nozzle temperature enhances the mechanical properties of PBAT. Notably, the highest nozzle temperature of 200 °C yielded remarkable results, with an elongation of 1379% and a tensile strength of 7.5 MPa. Moreover, specimens with a 60% infill density exhibited superior compressive strength (1338 KPa) and energy absorption compared with those with 40% infill density (1306 KPa). The SEM images showed that with an increase in the nozzle temperature, the quality of the print was greatly improved, and it was difficult to find microholes or even a layered structure for the sample printed at 200 °C.

Effect of incorporation of star‐shaped polycaprolactone on structure‐properties relationship of chitosan‐based networks via urethane/urea linkage

AbstractA chitosan‐based network was fabricated using hexamethylene diisocyanate as a crosslinking agent. The effect was investigated of incorporating star‐shaped polycaprolactone (stPCL) into chitosan‐based networks (CS/stPCL), where the stPCL content varied from 10 to 50 wt%. Quantitative analyses of the urethane/urea linkages and of the stPCL content in the networks were determined based on curve fitting and Soxhlet extraction, respectively. The optimum weight ratio was 80:20 for CS and stPCL (80CS20stPCL), with the highest urethane/urea linkages and stPCL content in the network (30.73%). The compressive testing and rheological analysis indicated that incorporating stPCL enhanced the compressive strength and rheological properties of the chitosan‐based network. In addition, the 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyl‐2H‐tetrazolium bromide assay of the CS/stPCL network had a cell viability percentage greater than 70%. The CS/stPCL network promoted the formation of an apatite layer on the surface, indicating that the CS/stPCL network could be a promising candidate for tissue engineering.

Investigation on the compressive strength and durability properties of alkali-activated slag mortar: Effect of superabsorbent polymer dosage and water content

This paper presents the properties of alkali-activated slag (AAS) mortar additivated with a superabsorbent polymer (SAP) to improve its mechanical and durability properties. The effect of different dosages of SAP (0.0–0.3% with respect to the blast furnace slag weight) and different extra water additions on setting time, autogenous shrinkage, compressive strength, water permeability, frost resistance, heat of hydration, and porosity is presented and discussed. The results highlight the beneficial effect of adding SAP on the mechanical and durability properties of the proposed mixtures. Only at higher percentages of SAP and additional water occur performance drops due to excessive macro-porosity of the system. It is interesting to point out that, in contrast, shrinkage always decreases as the percentages of SAP addition and additional water increase, although it cannot be completely eliminated. Experimental evidence also highlights that significant benefits can be gained from using this material in harsh environments.

Evaluation of Setting Time, Compressive Strength, Microleakage and Antibacterial Properties of Nano Hydroxyapatite Incorporated GIC: An In-vitro Study

Introduction: Glass Ionomer Cement (GIC) is widely used as a restorative material, but it still exhibits some limitations that pose significant drawbacks in clinical use. The composition of Hydroxyapatite (HA) mimics the inorganic fraction of mineralised tissues such as bones and teeth. HA possesses osteoconductive and bioactive properties, making it favourable for orthopaedic and dental applications. Aim: The aim of this study was to evaluate and compare the setting time, compressive strength, microleakage and antibacterial properties of nano-HA incorporated GIC (NHaGIC) at various concentrations with Type-II GIC. Materials and Methods: This in-vitro study was conducted in the Department of Paediatric and Preventive Dentistry at Sri Aurobindo College of Dentistry in Indore, Madhya Pradesh, India, for a duration of nine months, from May 2023 to January 2024. The study comprised five study groups as follows: Group-1- Type-II GIC (control), Group-2-NHA-GIC 4%, Group-3-NHA-GIC 8%, Group-4-NHA-GIC 10% and Group-5-NHA-GIC 15%. A total of 50 acrylic moulds containing the test material and TypeII GIC, with 10 in each group (n=10), were prepared to record the setting time, which was tested using a Gillmore needle. The compressive strength was checked using a Universal Testing Machine. Additionally, 50 primary molars were selected according to inclusion and exclusion criteria and randomly divided into five groups (n=10) to evaluate microleakage. Microleakage was assessed using the dye penetration method under a stereomicroscope. For antibacterial properties, 50 samples (n=10) were taken for each strain, i.e., Strain A: S. mutans and Strain B: L. fermentum and the disk diffusion method was employed. Thus, a total sample size of 250 was used. The preparation of GIC-NHAp was done by adding nano- HA to GIC at selected concentrations by weight/weight percentage (w/w%). The results were analysed using a one-way Analysis of Variance (ANOVA) test. Results: A statistically significant difference was observed (p<0.001) between Group-1 (GIC II) and Group-II (4% GICNHAp), III (8% GIC-NHAp), IV (10% GIC-NHAp) and V (15% GIC-NHAp) regarding setting time, compressive strength, microleakage and antibacterial properties. Conclusion: It can be concluded that adding NHAp crystals to GIC enhances its properties, such as compressive strength and antimicrobial efficiency, as the concentration increases. The microleakage property showed a consistent decrease with increasing concentration. However, the setting time increased with higher concentrations of NHAp in GIC.

Fracture behaviour assessment of high-performance fibre-reinforced concrete at high strain rates using interpretable modelling approaches

High-performance fibre-reinforced concrete (HPFRC), a type of cementitious composite material known for its exceptional mechanical performance, has widespread applications in structures exposed to severe dynamic loading conditions. However, understanding nonlinear HPFRC fracture behaviour, particularly under high strain rates, remains challenging given the complexities of assessment procedures and cost-intensive nature of experiments. This study presents an interpretable framework for modelling and analysing HPFRC fracture strength at high strain rates. A wide range of machine learning methods, including ensemble techniques, were employed to capture multivariate effects of eight essential input features (e.g., mortar compressive strength, fibre physical and mechanical properties, cross-sectional area, and strain rate) on fracture strength response. To assess the derived models, a novel evaluation procedure was proposed involving a data-based analysis, employing established metrics (i.e., coefficient of determination, root mean squared error, and mean absolute error via K-fold cross-validation) and a domain experts-involved evaluation utilising global sensitivity analysis to discern first-order and higher-order interactions among input factors. The proposed approach efficiently yielded both quantitative and qualitative insights into crucial input factors governing HPFRC fracture strength with limited experimental data. The obtained findings highlight the significance of multivariate effects, such as the interaction between strain rate and fibre tensile strength, and between fibre volume and fibre diameter, on fracture behaviour. The proposed interpretable framework aims to provide a powerful tool for proactive material failure analysis by understanding fracture behaviour and identifying potential weak and strong interactions among input factors of HPFRC-based samples. Moreover, the utilisation of the proposed approach enables researchers and civil engineers to efficiently focus on the most critical input parameters during the early design stage and ensuring the structural integrity and safety of HPFRC-based constructions.

Experimental Investigation into the Impact of Substituting Natural Sand with Manufactured Sand in Landfill Construction

There is a lower requirement for river sand in construction because of a number of logistical and environmental problems. In response to these issues, alternative materials are being increasingly recognized by the construction field progressively M. Sand, derived from the mining and processing of rocks that is a low-particle-size substitute to natural sand which demonstrates potential. Amongst its numerous applications are surface polishing, prefabricated cement components, hollow block development, and lightweight component production. Practitioners and researchers both have been giving special attention on the usage of M. sand in the last few years. This has led to further study into its suitability for replacing river sand in concrete production. The formulation of concrete blends using M. Sand has been made possible through various mix designs developed according to relevant design codes such as IS codes. An assessment of the mechanical properties and structural performance -of concrete containing M. Sand has been conducted using cubes, cylinders, and beams compared to traditional natural sand concrete. As a result of these tests, the compressive, flexural, and tensile strength properties of M. Sand and M. Sand can be compared, suggesting M. Sand has similar properties. Concrete construction applications can utilize sand as an environmentally sustainable and viable alternative to natural-river sand, thereby addressing sustainability concerns and resource scarcity concerns.

Compressive strength and thermal properties of ferro coke prepared by cold pressing method

Compressive strength and thermal properties of ferro coke prepared by cold pressing method

Correlation of Mechanical and Durability Properties of Binary and Ternary Blended High-performance Concrete

High-performance concrete is a specialized type of concrete renowned for its exceptional strength, durability, and resilience to various environmental stresses. Typically it’s crafted using a combination of two or three supplementary cementitious materials (SCMs) in precise proportions to achieve specific performance attributes. Ternary blended concrete, for instance, incorporates three different SCMs alongside Portland cement. This study delved into the relationship between mechanical and durability aspects of high-performance concrete. Durability measures including electrical resistivity, water absorption, porosity, chloride penetration, and carbonation were analyzed alongside the compressive strength of various concrete mixes. The findings indicate that ternary blended concrete displays superior electrical resistivity, lower water absorption, reduced critical pore size, decreased chloride diffusion coefficient, and slower corrosion rate compared to binary mixes. Power correlations were conducted on these durability parameters, revealing a positive correlation between compressive strength and durability properties.