Compressive Strength Test Results Research Articles

The synergic effects of metakaolin and polycarboxylate-ether on dispersion of graphene oxide in cementitious environments and macro-level properties of graphene oxide modified cement composites

Studying the effects of pozzolanic materials such as silica fume, fly ash, and metakaolin (MK) on dispersion of graphene oxide (GO) in cementitious environments has attracted interest in recent years. In this research, the potential of MK particles as an impediment against GO agglomeration in high alkaline environments is investigated. Despite the exhibited results in previous studies that the particles of pozzolans can inhibit the agglomeration of GO in cementitious environments by consuming Ca(OH)2 besides the mechanical separation of GO sheets, the results of the present study revealed that MK particles alone could not prevent GO nanosheets from clustering, physically or chemically. However, based on UV–vis spectroscopy and SEM-EDS analysis results, the incorporation of MK particles with Polycarboxylate-ether (PCE) significantly ameliorates the dispersion and time-dependent stability of GO nanosheets in simulated cement pore solution. Indeed, in this case, the anchoring characteristic of the negative surface charge of MK particles besides the steric hindrance effect of PCE’s side chains can reduce the possibility of the interaction between GO nanosheets and calcium ions in cementitious environments. Moreover, the improved stability of MK-PCE modified GO suspensions ensures the permanence of the desired dispersion of GO in the alkaline medium of cement composites, which is advantageous for enhancing the mechanical and transport properties of cement composites. In this research, the results of compressive strength, flexural strength, flexural modulus, toughness, and ultrasonic pulse velocity tests on MK-GO incorporated cement paste samples after 28 days of curing showed an enhancement by 27.6%, 36.3%, 49.8%, 42.0%, and 5.0%, respectively compared to the reference sample. This improvement is primarily due to the beneficial effects of MK-PCE to make GO play a better reinforcing role in cement composites.

Effect of acidic and sulfated environments on phase transformation, compressive strength and microstructure of natural rubber latex-modified cement pastes

This study investigated the influence of aggressive acid and sulfate media on the phase transformation of cement materials to which natural rubber latex was added. After 28 days of curing underwater, all samples were subjected to sulfuric acid (H2SO4) and sodium sulfate (Na2SO4) solutions for 0, 7, 14, or 28 days. After that, X-ray diffraction (XRD) was used for phase identification. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) was used to confirm the chemical functionally of the samples. The microstructure and elemental composition were also studied using scanning electron microscopy (SEM) and energy X-ray dispersive spectroscopy (EDS), respectively. XRD data showed no evidence of any clear relationship in rubber-modified cement pastes between any phase transformation and natural rubber content. FTIR results confirm the presence of portlandite, calcite, gypsum and C–S–H phases and indicate interaction between the rubber and cement phases. The inclusion of natural rubber latex in cement led to formation of a water channel structure of the bassanite phase (CaSO4 0.625H2O) after 14 and 28 days of exposure to sulfuric acid solutions. Bassanite (CaSO4 0.5H2O) and the water channel structures of bassanite were not found in the samples after sodium sulfate attack. Based on the results of compressive strength tests, it was suggested that an optimal ratio (rubber/cement = 11.11%) enhanced the stability of cement paste after acid and sulfate exposure. From SEM images, a major change in morphology was observed for samples exposed to H2SO4 compared to those subjected to Na2SO4.

Mechanical and Thermal Performance of Cement Mortar Incorporating Super Absorbent Polymer (SAP)

Super Absorbent Polymer (SAP) is a favorable admixture which can influence various properties of cementitious materials. It mainly improves the water retaining properties of cement-based construction materials. In this paper, an experimental program was carried out to determine the mechanical and thermal performance of cement plaster containing SAP. Firstly, the absorption capacity of SAP was determined in different loading conditions and chloride solutions. Thereafter, the optimum dosage of SAP for cement plaster was also determined from five different proportions of SAP (0.05, 0.1, 0.3, 0.5 and 1% of cement mass) based on the compressive strength test results. The mortar incorporating 0.05% SAP of cement mass was selected as the optimum dosage, which yielded the highest compressive strength. Two slabs of 1×1×25 mm with 0.05% SAP and two slabs of 1×1×25 mm without SAP were cast to determine the thermal performance of the cement mortar with and without SAP. For this purpose, a wooden chamber of 2×1×1 m was constructed and the slab was placed in the middle of this chamber to carry out the thermal performance test of cement mortar. The slabs with 0.05% SAP showed promising results for acting as a thermal barrier in buildings compared to slabs without SAP. Doi: 10.28991/cej-2020-03091614 Full Text: PDF

Effects of silica aerogel inclusion on the stability of heat generation and heat-dependent electrical characteristics of cementitious composites with CNT

The present study investigated the effects of silica aerogel inclusion on the stability of heat generation and heat-dependent electrical characteristics of cementitious composites with carbon nanotube (CNT). The heat generation and heat-dependent electrical characteristics of the specimens were explored under the monotonic and cyclic heating conditions and they were discussed in terms of compressive strength and SEM test results. The test results indicated that the addition of the silica aerogel improved the stability of heat generation and changes in the electrical resistivity of up to 63% and 68%, respectively, upon 20 cycles of the heating tests. The enhancement in the electrical properties is attributed to the fact that the incorporated silica aerogel mitigated the re-distribution of CNT particles due to hydration reaction during the heating process, which in turn improved the stability of heat generation and heat-dependent electrical characteristics of the cementitious composites.

Design of Self Compacting Concrete Using Artificial Neural Networks (Dept.C)

Application of artificial neural networks (ANNs) model to design the mix component of self compacting concrete (SCC) with desirable properties, compressive strength and slump flow, is described in this research Artificial Neural Networks (ANNs) have recently been introduced as an efficient artificial intelligence modeling technique for applications involving a large number of variables, especially with highly nonlinear and complex interactions among input/output variables in a system without any prior knowledge about the nature of these interactions. Various types of ANN models are developed and used for different problems. In this paper, an artificial neural network of the feed-forward back-propagation type has been applied for the prediction of self compacting concrete mixtures. The main targets are SCC components and the inputs interred are compressive strength and slump flow. Due to the complex non linear effect of compressive strength and slump flow properties on the SCC components, the ANN model is used to predict the components of SCC parameters (mix components). SCC component parameters were outputted according to a multi mixes taken from 34 researches (1-34] related with self compacting concrete which contains the compressive strength and slump flow test results. Mix component values are considered as the aim of the prediction. A total of 225 specimens were selected from the laboratory results of about 34 researches. The system was trained and validated using 150 training mixes chosen randomly from the data set and tested using the remaining 75 mixes. About 20 mixes of experimental SCC not found in the entered data were performed experimental in order to simulate the program and compare between experimental and predicted mix design. Results indicate that SCC components can be predicted with reliable values to the experimental results using the ANN method.

The Impact of the Amount of Water Used in Activation Solution and the Initial Temperature of Paste on the Rheological Behaviour and Structural Evolution of Metakaolin-Based Geopolymer Pastes

This study aimed to determine the impact of the initial temperature of the paste (from 5 °C to 35 °C) and the addition of water, which reflects a decrease in the molarity of activation solutions (AS) by diluting 10 M NaOH with distillate water, on the rheological properties of geopolymer pastes. Additionally, this resulted in changes to the physical–mechanical properties of geopolymers after curing. A higher amount of water in the AS composition and higher initial paste temperature led to an increase in the spread values up to 28% and decreases viscosity. A smaller amount of water in the AS composition and a higher initial paste temperature accelerated the speed of the geopolymer structure formation up to 1.5 times during the curing period, increased compressive strength and reduced apparent porosity and pore size. X-ray diffraction confirmed the compressive strength test results and revealed that the lower amount of water in the AS and the higher initial paste temperature for the geopolymer preparation significantly affected the mineral formation and physical and mechanical properties of the samples.

Role of red mud as a cementing material in concrete: a comprehensive study on durability behavior

Red mud (RM), a semi-solid residual of the alumina refinery process, has higher alkalinity, and its disposal leads to environmental imbalance. To overcome this issue, RM is partially replaced with cement in the range of 0% to 20% at an interval of 5%. The present research work majorly focused on durability and micro-level concrete studies containing pre-calcined (600 °C in 2 h) RM. The tests on red mud concrete, viz. compressive strength, sorptivity test, open porosity test, rapid chloride penetration test, accelerated corrosion test, water absorption test, X-ray diffraction, scanning electron microscope (SEM), and energy-dispersive spectroscope (EDS) analysis, have been conducted to investigate the comprehensive characterization of concrete with RM. From the compressive strength test results, maximum strength was observed at 10% replacement. Open porosity, chloride ions permeability, water absorption, and sorptivity values showed reduction at an increment of RM replacement level. RM concrete offered more corrosion resistance due to high alkalinity, which possessed a pH of more than 12.5. From the micro-level investigations such as SEM and EDS, higher C–S–H gel formation was observed in RM 10% replacement concrete. In the meantime, less number of pores was observed in all RM replaced concrete mixes.

Impact of Fire on Mechanical Properties of Slurry Infiltrated Fiber Concrete (SIFCON)

This research aims to shed light on the fire flame effect on some mechanical properties of SIFCON samples, such as compressive strength, flexural strength and modulus of elasticity and comparing the results with CEN design curve and CEB. Higher temperature resistance is one of the most important parameters affecting the durability and service life of the material. This study comprised of casting and testing SIFCON specimens with 6% fiber volume before and after exposure to elevated temperatures. Two fire exposure duration of 1 and2 hours were investigate. In addition to room temperature, Silica fume was used as a partial replacement (10%) by weight of cement. It was found from the results achieved that after exposure to high temperatures, compressive strength, flexural strength and elastic modulus decreased. The drastically reduction of compressive strength took place with increasing temperature. The residual compressive strength, flexural strength and elastic modulus at 1010 °C were in the range of (58.4 to 80.1%), (81.6 to 78.7%) and (30.4 to 32.8%) respectively. The compressive strength test results of this study together with results obtained by other investigators were compared with CEB strength-reduction curve and that of CEN. It was noticed that the test results agreed with CEN design curve rather than with that of CEB.

Strength Characteristics of Controlled Low-Strength Materials with Waste Paper Sludge Ash (WPSA) for Prevention of Sewage Pipe Damage.

In this study, the effects of the mixing conditions of waste paper sludge ash (WPSA) on the strength and bearing capacity of controlled low-strength material (CLSM) were evaluated, and the optimal mixing conditions were used to evaluate the strength characteristics of CLSM with recyclable WPSA. The strength and bearing capacity of CLSM with WPSA were evaluated using unconfined compressive strength tests and plate bearing tests, respectively. The unconfined compressive strength test results show that the optimal mixing conditions for securing 0.8–1.2 MPa of target strength under 5% of cement content conditions can be obtained when both WPSA and fly ash are used. This is because WPSA and fly ash, which act as binders, have a significant impact on overall strength when the cement content is low. The bearing capacity of weathered soil increased from 550 to 575 kPa over time, and CLSM with WPSA increased significantly, from 560 to 730 kPa. This means that the bearing capacity of CLSM with WPSA was 2.0% higher than that of weathered soil immediately after construction; furthermore, it was 27% higher at 60 days of age. In addition, the allowable bearing capacity of CLSM corresponding to the optimal mixing conditions was evaluated, and it was found that this value increased by 30.4% until 60 days of age. This increase rate was 6.7 times larger than that of weathered soil (4.5%). Therefore, based on the allowable bearing capacity calculation results, CLSM with WPSA was applied as a sewage pipe backfill material. It was found that CLSM with WPSA performed better as backfill and was more stable than soil immediately after construction. The results of this study confirm that CLSM with WPSA can be utilized as sewage pipe backfill material.

Pozzolanic and mechanical properties of Date Palm Seed Ash (Dpsa) concrete

This paper presents the findings of a research work conducted on how to improve the mechanical properties of concrete using Date Palm Seed Ash (DPSA) as partial replacement of cement. The DPSA used was obtained by controlled burning of date palm seed in a kiln at a maximum temperature of 630oC for eight hours and air cooled afterwards. The ash obtained was sieved through 75μm sieve and its oxide composition analysed using X-ray fluorescence (XRF) procedures. DoE method of mix design was used to produce concrete ingredients for grade 30N/mm2 giving a water-cement ratio of 0.53. The effect of partial replacement of cement with DPSA on cement paste and concrete using 0, 2.5, 5, 7.5, 10, 15 and 20% DPSA was investigated through consistency and setting times tests, workability test, compressive strength test (at 7, 21, 28 and 56 days curing duration), pozzolanic activity index evaluation and water absorption test. Results show that DPSA has high silicon dioxide (45.50%), aluminum oxide (20.75%) and Iron oxide (7.25%). Findings indicate that the consistency and setting times of cement-DPSA paste increased with increase in the replacement of cement with DPSA. The workability of DPSA concrete decreased with increase in cement replacement. Compressive strength test results show that cement can be replaced with DPSA up to 10% as the compressive strength at 10% replacement is 31.5N/mm2 as against the 31N/mm2 of the normal concrete, at 56 days. The pozzolanic activity index result also show that DPSA concrete meets up the minimum requirement of 75% specified by ASTM C618-15. Also, the water absorption capacity of DPSA concrete at the highest replacement (20%) is 11% less than that at 0%.
 Keywords: Cement, Compressive strength, Concrete, Date palm seed ash, Partial replacement, Pozzolana

Effect of Particle Size of Quartz Sand Filler on Microstructure and Strength of Alkali-Activated Slag-Based Materials

Interaction between quartz sand and water glass has been investigated and characterized by using the Si/Na molar ratio to determine the role of silica in the polycondensation rate and mechanical properties of the synthesized materials as a function of quartz sand particle size. Results of atomic emission spectroscopy, SEM and compressive strength tests show that interactions between sodium silicate solution and quartz sand depend on the degree of dispersibility that determines the degree of amorphization of quartz sand. When using ordinary quartz sand sodium silicate solution acts as a thin layer of glue covering the grains of sand and weakly binds them to each other, while using finely ground quartz sand in the mixture there is a dissolution–precipitation reaction that modifies the surface layers of the particles and more strongly consolidating the granular system. The increase in the molar ratio of Si/Na in sodium silicate solution containing finely ground quartz sand occurs due to the increase in the proportion of amorphous quartz (according to XRD) and corresponds to the described mechanism. Then, samples of alkali-activated slag-based materials with a coarse ordinary quartz sand and finely ground quartz sand were synthesized, compared in terms of strength and the latter characterized by SEM, porosimetry, XRD. The increase of dispersibility and amorphization of quartz sand is established to favors to form consolidated of low-temperature curing materials based on alkali-activated slag and quartz sand with the significantly increased compressive strength from 30–44 MPa for mixtures based on ordinary coarse quartz sand to 95–140 MPa for finely ground slag/sand blended mixture.

Effectiveness of Glass Powder as a Partial Replacement of Sand in Concrete Mixtures

Concrete is commonly used as the main component in a building. Concrete is obtained by mixing Portland cement, water, aggregates, and sometimes added ingredients at certain comparisons in the form of chemicals, fibrous materials, and non-chemical materials. Utilization of glass powder waste for concrete mixtures is now being developed. This research was conducted to determine the optimum composition of glass powder as a partial replacement of sand against the compressive strength of concrete. The content of the glass powder mixture used is 10%, 15%, 20%, and 30% of the weight of sand in the concrete mixture. Slump test results showed that in the variation of coarse glass powder concrete slump decreased due to lack of bonding capacity between the aggregates. In concrete with a variation of fine glass powder the slump slightly decreases because the fine glass powder absorbs too much water. Concrete compressive strength testing is carried out at 28 days. The results of concrete compressive strength test showed the optimum value can be achieved by 22.8 MPa with 15% variation in glass powder content. The use of glass powder is effective as a substitute for partial sand at 15% of coarse glass powder.

STUDI KELAYAKAN MATERIAL GUNUNG DAERAH ALIRAN SUNGAI ARAH MALANG-KOTA BATU DALAM PENGGUNAANNYA SEBAGAI SALAH SATU MATERIAL BETON

Abstract The use of the mountain seal used as a building block for concrete should be considered, based on current usage apart from being a light construction material for housing, mountain materials from these two places are used as the main aggregate material for building construction, water structures (dams), roads. and bridges located in the surrounding Malang-Kota Batu area To determine the size of the aggregate, the coarse aggregate is sieved using a vibrating sieve, while the fine aggregate is sieved by a hydraulic sieve. In the screening process, about 70% of the filtered must pass so that high efficiency and capacity can be achieved. The compressive strength test results obtained the average compressive strength value at 28 days of concrete for concrete with fine aggregate sand zone III and coarse aggregate (gravel) in the Batu City area is equivalent to 35.65 MPa. The results of the split tensile strength test showed that the average split strength value at the age of 28 days for concrete with fine aggregate sand zone III and coarse aggregate (gravel) in the Kota Batu area is equivalent to 2.51 MPa. The compressive strength value for normal concrete is 35.65 MPa, it should produce split tensile strength = 4.179 MPa according to the provisions of SNI T-15-1991-03 Article 3.2.5 (fr = 0.70√fc '). Even though the split tensile strength value obtained in the laboratory is only 2.51 MPa, this means that the quality of materials (sand and broken stone) from Batu City is not suitable for use as building materials. Because the number 2.51 MPa is relatively much smaller than the value of 4.179 MPa, it is only one of the factors outlined in the SNI T-15-1991-03 article 3.2.5. Keywords: Mountain Material, Concrete, Concrete Compressive Strength Test, Concrete Tensile Strength Test

Impact of maturation conditions for concrete on its compressive strength

This paper aims to present the results of compressive strength tests of concrete specimens, prepared according to two recipes, after 2, 7 and 28 days of maturing in four different environments. The concrete specimens had the same w/c ratio, the same amount of aggregate of particular fractions, the addition of a superplasticizer, but they differed in the cement type. In one recipe, the Portland cement CEM I 32.5R was used, in the other – pozzolanic ash cement CEM IV/B(V) 32.5R-LH/NA. Concrete specimens with dimensions of 100 x 100 x 100 mm made according to both recipes were placed in individual ripening environments: in cuvettes with water, soaked and wrapped with construction foil, left in room conditions in the laboratory, placed outside the laboratory and being exposed to the atmospheric conditions. The obtained compressive strength results confirmed that the best way of curing concrete is the wet cure (in cuvettes with water). It has been proven that the choice of proper curing method is key in terms of compressive strength.

Evaluating the use of steel scrap, waste tiles, waste paving blocks and silica fume in flexural behavior of concrete

Steel scrap is a waste product of steel plate manufacturing industry. A large quantity of steel scrap is produced by drilling every year. The disposal of those steel scraps is a major issue in Iraq and all over the world. The landfill is one of the methods for disposing the scraps albeit it produces soil pollution. What is worse is that in Iraq there is no waste separation system in a sense that all the waste materials are dumped in soil especially in the desert, and it is harmful to the environment. One way to alleviate the situation, the present study suggests that steel scrap is added with concrete, and the mechanical and physical properties were studied. Waste materials, such as terrazzo tile and paving block, are dumped in landfills. Such action destroys the environment. Recycling these materials and using them as fine and coarse aggregate in new concrete mixes would eliminate the problem. Additionally, these waste materials are considered as non-degradable. Silica fume has been employed as a partial replacement by weight of cement at percentages of (8%, 12%, and 16%) to enhance the concrete that contains the waste materials. This paper examines the workability of addition of steel scrap to the weight of concrete by the percentages of (0.6%, 1.2%, and 1.8%) as well as the addition of porous tile and paving block as partial substitute by percentages of (15%, 30%, and 45%) for coarse and fine aggregate, respectively. Concrete samples were produced and subjected to compression strength, water absorption and split tensile tests. A reduction in strength was observed for all concretes that contain porous tiles waste as the percentage increased, in relation to the control concrete. On the other hand, concrete that contains waste paving blocks shows an increment in strength at the percentages of (15% and 30%) and reduction at the percentage of 45%. Based on the compressive strength test results, steel scrap samples being at 0.6%, 1.2%, and 1.8% show that the strength increased of the samples with 0.6% and decreased of those at 1.2% and 1.8%. Thus, this research demonstrates that the use of three waste materials-crushed tiles waste, steel scraps and paving blocks waste as components of concrete is technically feasible in the manufacture of concrete.

Mechanical and electromagnetic performance of cement based composites containing different replacement levels of ground granulated blast furnace slag, fly ash, silica fume and rice husk ash

In this study, cement additives were replaced with cement in mortar mixtures by mass. Mortar specimens were prepared with different additives and dosages which were mechanically and electromagnetically tested. According to the compressive strength test results, mortars containing ground granulated blast furnace slag had weak early age strength and strong later age compressive strengths values, mortars containing fly ash had lower compressive strength value with increasing amount of additives in the mortar mixture for both 7 and 28-day samples, mortars containing silica fume had the maximum strength values at 20% replacement level and lastly the mortars including more than 10% rice husk ash showed weaker strength behaviors with increasing amount of rice husk ash. Besides, electromagnetic responses of the mortar samples were investigated in the frequency range of 3–18 GHz. The reflection and transmission values were measured and the absorption characteristics were calculated. According to the electromagnetic test results, it is revealed that the mortars including ground granulated blast furnace slag can be utilized in the applications of high stealth technology and electromagnetic shields in a wide frequency range of communication field. An increase in the ratio of fly ash in the mortars reduces the transmission of the electromagnetic wave. Mortars including silica fume had very low values of reflection and transmission. Hence, it is expected that the absorption values must be high due to dependency of absorption to reflection and transmission, and it can be said that mortar with rice husk ash exhibits a strong absorber behavior.

Socket prosthesis manufacturing process made from bamboo fiber composite materials

This research aims to develop the manufacturing process of making socket prosthesis with bamboo fiber composite material and epoxy matrix. Bamboo fiber was chosen because it is strong, environmentally friendly, and recyclable. The focus of research is to arrange the manufacturing process of making sockets, starting from material preparation to socket testing. The method used in this study is a customized method and prototype socket manufacture in accordance with the dimensions obtained from the patient. Based on the results of the research that has been carried out, stages of the manufacturing process, results of compressive strength testing, and morphological analysis of socket products are obtained. These results will be a reference in future research.

Effect of local sand ratio toward compressive strength and dielectric properties of concrete

In this work, we report the effect of local sand ratio on compressive strength and dielectric properties of concrete. Concretes were made by mixing Portland cement mixed with local sand in various compositions of 1:2, 1:3.1:4.1:5, 1:6, and 1:7. These mixtures were printed in the form of 5×5×5 cm3 and have maintained (soaked) for 27 days. Specimens were characterized on the 28th day. Compressive strength was tested using the compression test and dielectric test with a series LCR meter. The compressive strength test results show that the more significant sand addition in the mixture decreases the compressive strength. Dielectric test results reveal that the higher addition of sand in the mixture reduces the dielectric constant. These results indicate that the dielectric constant measurement can be used as an alternative method for the investigation of concrete quality.

Effects of Low-Density Polyethylene (LDPE) Strips on Some Engineering Properties of Cement-Stabilized Lateritic Soils

The study investigated the compaction and strength characteristics of lateritic soils stabilized with 3% cement and waste sachet water-proof (low-density polyethylene, LDPE) strips. Three (3) lateritic samples collected from Ugwuoba, Nawfia, and Okpuno in Enugu and Anambra states of Nigeria were used in the study. Index properties tests on the samples show that they fall within class A-2-6(1) and A-2-4(0) based on the American Association of State Highway and Transportation Officials (AASHTO) and SM/SC based on Unified Soil Classification System (USCS). LDPE strips were varied at 0, 0.25, 0.5, 0.75, 1, 1.5, and 2% based on the dry unit weight of the soil. Results of unconfined compressive strength (UCS) tests show significant improvement in the strength of the soils at 2 % LDPE strips. Statistical analysis also shows that a significant relationship exists between the percentage of LDPE strips, compactive effort, and maximum dry unit weight (MDUW)/optimum moisture content (OMC), UCS of the soils. The tensile and flexural strength of lateritic soil stabilized with 3% cement can be improved optimally by the addition of 2% of low-cost LDPE strips of aspect ratio (AR) of 10 mm  10 mm.

INVESTIGATION OF EFFECTS OF RECYCLED AGGREGATES AND BLAST FURNACE SLAG ON PROPERTIES OF SELF-COMPACTING CONCRETE

The effects of simultaneous use of recycled aggregates and ground blast furnace slag as a percentage of cement-constituting materials on different properties of fresh self-compacting concrete (SCC) are investigated in this study. To this end, three series of SCC mixtures with a fixed volume of cement paste equalling 380 ltr/m3 (2.36 gal/ft3) and the replacement ratio of coarse aggregates (fifty percent and one hundred percent) and total aggregates (zero percent, fifty percent and one hundred percent) were prepared. The water content ratios in the first, second and third series were 0.4, 0.45, and 0.5, respectively. The results of the compressive strength tests for 7-day, 14-day and 28-day cubic specimens and compressive strength and Brazilian test results for 28-day cylindrical specimens were used as control parameters governing the SCC resistive quality. The results of fresh SCC tests (including slump-flow and T50 tests, V-funnel test, and L-box test) showed that the negative effect of recycled fine aggregates on fresh SCC properties is significantly more than that of recycled coarse aggregate. However, recycled SCC with acceptable properties can be obtained with a slight increase in the amount of superplasticisers used in the presence of slag.