Factors affecting the results of concrete compression testing: A review

Talaat, Abdalla; Emad, Abdelrhman; Tarek, Ahmed; Masbouba, Mohamed; Essam, Ashraf; Kohail, Mohamed

doi:10.1016/j.asej.2020.07.015

Cited by 66 publications

(23 citation statements)

References 105 publications

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“…It should be noted that small size samples were used here considering the size of the reactor. This may lead to a greater CO 2 uptake capacity and compressive strength compared to larger size samples due to the diffusion depth of the carbonation curing process, 21 but it does not affect the intercomparison of the dolomite additive Portland cement (DPC) samples.…”

Section: Methodsmentioning

confidence: 99%

Enhanced carbonation curing of cement pastes with dolomite additive

Guo

Wang

et al. 2022

Greenhouse Gases

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Carbonation curing of cement-based materials has recently received increasing attention as a CO 2 utilization technology. This study aimed at investigating the effects of carbonation curing on the performance of ordinary Portland cement (OPC) pastes with dolomite additive (DPC). The CO 2 uptake capacity, after being normalized to carbonation active components, significantly increased with larger dolomite mixing ratios. For DPC-25% samples under 2.5 MPa curing pressure, the maximum CO 2 uptake capacity reached 23.6 wt%, which was 23% higher than that of pure OPC samples under the same condition. Effects of water to solids (w/s) ratio and temperature on carbonation are two-sided. The optimum w/s ratio for CO 2 uptake capacity of DPC-15% samples was approximately 0.20, while the optimum temperature was equal to 60 • C or higher than 60 • C. The CO 2 uptake capacity increased with finer particle size and higher CO 2 curing pressures. Compared to large particles, smaller particles are more likely to have a better dilution effect, providing more contact surface for carbonated precipitation. From the pore structure changes perspective, carbonation products filled the interface between the dolomite and amorphous particles. DPC-25% samples with higher dolomite mixing ratios provided more pores and pathways for gas diffusion, and exhibited a more uniform structure, thereby contributing to the highest compressive strength values of DPC-25% samples (63.8 MPa) among all the DPC samples. These findings imply the possible feasibility of dolomite as an additive in carbonation cured building materials.

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Section: Methodsmentioning

confidence: 99%

Enhanced carbonation curing of cement pastes with dolomite additive

Guo

Wang

et al. 2022

Greenhouse Gases

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“…In order to compare compressive strengths of concrete with different dimensions, size effect should be considered [4]. However, current research, studied the size effect of concrete subjected to uniaxial compression, showed that the strengths of φ150 × 300 mm and φ100 × 200 mm cylinders with the same length-to-diameter ratio (L/D) are almost the same for lower strength concrete [20][21][22]. Therefore, the conversion factor that accounts for the different sizes of concrete specimens was not considered in this test program.…”

Section: Test Methodsmentioning

confidence: 99%

Development of a Novel Concrete Curing Method Using Induction Heating System

2020

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This study aimed to develop an accelerated concrete curing method based on induction heating (IH) technology. The proposed curing method provides improved heating efficiency and safety since it directly heats only the metallic forms in a non-contacting manner. It also has the advantage of being capable of heating the concrete according to a desirable heating scenario. The effects of several parameters on its performance were evaluated using a finite element method (FEM)-based thermal analysis and heating performance tests. The FEM analysis revealed the steel form to be appropriate for the IH system. The analysis also revealed that equally spaced three-turn coils yielded increased temperature uniformity in the steel form, which was verified by results of the steel form heating experiments. Furthermore, the minimum temperature generated in the form was sufficient for concrete curing. The efficiency of the use of IH for concrete curing and the effects of curing parameters were further investigated through compression tests after applications of various curing methods and by examining the temperature distributions during curing. The test results revealed early strength development even under water freezing conditions. This demonstrated the effectiveness of IH for concrete curing in cold weather. However, the efficiency decreased when the cross-sectional dimension of the specimen increased. The test results also verified that the maximum temperature and duration of induction heat curing affect the early age strength of concrete.

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“…Compression test is a significant phenomenon related to concrete. Compressive strength varies depending upon the size of the specimen and the change in strength is different for different geometries [26]. GA is faster and more efficient than traditional methods and optimizes both continuous and discreet functions.…”

Section: Figure 3 Cube Molds Filled With Concretementioning

confidence: 99%

A Study on the Mechanical Properties of Green Concrete

et al. 2022

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Green concrete is a type of concrete that uses waste materials as one of its ingredients. Hazardous wastes like fly ash and silica fume can be used to partially replace cement in concrete, which varies in physical and chemical properties. On the other hand, the increase in automobiles in urban and rural areas has led to an increase in the number of waste tires, which promotes environmental pollution due to disposal issues throughout the world. This study aims to use waste materials which can partially replace cement and conventional aggregates in the concrete mix. Fly Ash (FA), Silica Fume (SF), and Plaster of Paris (PP) replaced cement, whereas Reclaimed Rubber (RR) partially replaced coarse aggregates by weight. This work is focused on experimentation and simulation of M 40 grade mix using the above four materials. 306 cubes were cast by replacing cement with FA, SF, and PP in 3% increments up to 24%. Similarly, coarse aggregates were replaced with RR using the same proportion. Compression tests were carried out using a Universal Testing Machine. 12% silica fume replacement exhibited maximum strength during individual replacement of materials in concrete, which is selected as the optimum percentage replacement. FA and PP developed ultimate strength at 9% replacement of cement in the concrete mix, which is considered the optimum replacement percentage. A Genetic Algorithm (GA) model was developed using a C++ program to simulate various combinations of FA, SF, PP, and RR based on individual optimum replacement percentage. Hence, 1600 combinations were identified with the above four materials. Hence, GA was used as a tool to simulate the compressive strength of concrete to reduce time and cost. During simulation of combined replacement using GA, very high and very low compressive strength values were neglected, and 32 combinations were selected based on optimum compressive strength values. Finally, five combinations (C1-C5) were recognized, which resulted in higher compressive strength than individual optimum values after simulation. The GA-based numerical results were validated by casting 15 cubes for all the five combinations. 15 beam samples of size 100 150 1500 mm were cast with the above five combinations, cured and tested using a loading frame. A load-deflection curve was plotted, which showed that material replacement increased the flexural strength of the concrete mix. Doi: 10.28991/CEJ-2022-08-05-012 Full Text: PDF

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Factors affecting the results of concrete compression testing: A review

Cited by 66 publications

References 105 publications

Enhanced carbonation curing of cement pastes with dolomite additive

Enhanced carbonation curing of cement pastes with dolomite additive

Development of a Novel Concrete Curing Method Using Induction Heating System

A Study on the Mechanical Properties of Green Concrete

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