increasing compressive strength of concrete
The Time Variation Law of Concrete Compressive
2023.3.24 In addition, the compressive strength of concrete was mainly affected by the water–cement ratio, and strength increased with a decrease in the water–cement ratio [51,59,63]. The CEB-FIP Model
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Early-age performance of self-compacting concrete under
2022.12.1 Under the working conditions of this study, after approximately 7 d of stepwise increasing compression, the performance (chloride resistance, strength, etc.) of
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A systematic review and assessment of concrete strength
2023.7.1 In Civil Engineering field, the compressive strength of concrete is a key parameter to design concrete structures and evaluate existing structures. Conventionally
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Compressive strength prediction model of high-strength concrete
2021.1.12 Introduction. In the ACI 318 [ 1 ], “high-strength concrete (HSC) is that which accomplishes cylinder compressive strength of no less than 41 MPa at 28 days.”.
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In‐situ compressive and tensile performances of high strength ...
2 天之前 After this, the in-situ specimens underwent slight increase in the compressive strength with only around 25% decrease at 400°C and 14%–16% decrease at 600°C.
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with the of increasing of compressive concrete strength in ratios mentioned above. Keywords: High strength Concrete, Beams, Strength, Deflection, Ductility. 1. Introduction,
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Machine Learning-Based Prediction of Compressive
Abstract: Fiber Reinforced Polymer (FRP) has played a crucial role in the construction industry for some time by strengthening concrete structures, increasing their longevity,
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Innovative machine learning approaches to
3 天之前 Rapid urbanization and industrialization have spurred an increase in concrete manufacturing, contributing to resource depletion and environmental damage. However, this challenge can be addressed by
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Prediction of Axial Compression Behavior of Confined Concrete
1 天前 The ductility of specimens improves with the increasing stirrup and CFRP ratios, while the increment at cryogenic temperatures is less than that at 20°C. ... can provide
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Full article: Compressive and Flexural Strengths of Bio ...
2023.12.26 Incorporation of bacillus subtilis bacteria in concrete increases the compressive strength (f ck) and flexural strength (f t) of the concrete samples. At 0.45 w/c, the f ck increased by 24% from 25.8 MPa (NC) to 32 MPa (BC), while the f t increased by 8% from 3.7 MPa (NC) to 4.0 MPa (BC).
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Efficient models to evaluate the effect of C3S, C2S, C3A, and
2023.1.1 After F e 2 O 3, A l 2 O 3 a n d C a O plays the second most dominant role in increasing the compressive strength of cement paste. All of these conclusions are supported by the information from the literature. In terms of mineral compositions, C 3 S and C 4 A F contributes positively to the compressive strength of cement paste, based on the ...
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Prediction model for the compressive strength of green concrete
2023.2.1 The results showed that the increase of cement kiln dust in the mix and accordingly the decrease in water/cement ratio, the two samples with 10% and 20% additional CKD had increased the ...
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What is Concrete PSI? Compressive Strength Explained - Concrete
2023.5.26 Concrete is known to be strong and long-lasting, but just how strong it needs to be to do its job varies, depending on the application. The compressive strength of concrete refers to how many pounds per square inch (psi) it can handle when force is applied. It is a reliable indicator of how it will perform under heavy loads or internal ...
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Mechanical properties of concrete at low and ultra-low
2022.12.27 Where σ cl and σ c0 are the compressive strength of concrete at low temperature, and room temperature (20 °C), respectively, and σ c is the increment of compressive strength (MPa).. Fig. 1 shows the relationship between the increment of compressive strength and temperature obtained by different researchers through low
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Effect of Concrete Strength on Shear Capacity of Reinforced
2022.8.21 In order to evaluate the shear strength and behavior of high-strength concrete beams without web reinforcing, eight high-strength continuous concrete beams with cross sections of 200 mm by 300 mm were cast and tested to failure. The ultimate load-carrying capability and shear behavior are presented. The applicability of the Sudheer et
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(PDF) Influence of superplasticizer on strength of concrete
2012.1.1 However, compressive strength is improved by dosage 1.0% of SP after 28 days curing is 55 N/mm2, which is higher than that of control concrete, the optimum amount of admixture must be 1%. Over ...
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Compressive Strength Of Concrete: Cube Test Results At 7
2019.1.6 Size of the concrete cube = 15 cm x 15 cm x 15 cm. Area of the cube sample =225 cm 2 (22500 mm 2) The same calculation should be done for 28 days of compressive strength. The maximum load applied or load at failure of cube = 400 KN (400×1000 N) Compressive strength = (Load in N/ Area in mm2)=400×1000/22500
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Effects of ocean salts on the compressive strength of concrete
1978.7.1 The 28-day compressive strength of seawater concrete was enhanced dramatically and almost linearly with increase of salinity from 0 to 7% [84], while it was decreased to 65–70% of the compressive strength of ordinary concrete due to the crystallization of salt in seawater containing 20% sodium chloride at the later ages [88].
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Effect of vibratory mixing on the slump, compressive strength, and ...
2021.11.1 The compressive strength results at CM and different vibration parameters are shown in Fig. 4, Fig. 5. As seen in Fig. 4, there is an increase in compressive strength and a decrease in coefficient of variation comparing the VM with CM. It is mainly attributed to that vibratory mixing effectively help the agglomerate cement particle disperse and ...
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Increasing Concrete Strength - North America
2024.1.24 The compressive strength of concrete can be increased by: Including admixtures. Adjusting the cement type and quantity. Reducing the water/cement ratio. Utilizing supplementary cementitious materials
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Everything You Need to Know About Concrete
2019.3.31 While traditional concrete normally has a compressive strength ranging anywhere from 2,500 to 5,000 psi, UHPC can have a compressive strength of up to 10 times that of traditional concrete. After
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Early-age performance of self-compacting concrete under
2022.12.1 Under the working conditions of this study, after approximately 7 d of stepwise increasing compression, the performance (chloride resistance, strength, etc.) of all groups of concrete improved. The compressive strength can be increased by >20 %, and the chloride diffusion coefficient could be reduced by >30 %.
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Compressive and Flexural Strength of Concrete with
With recent technological advances, adding nanomaterials as a reinforcement material in concrete has gained immense attention. This review paper aims to report advances in the form of a one-stop shop catering to methods that focus on improving the quality of traditional concrete. Nanoparticles#x2014;the elementary form of nanomaterials#x2014;are
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An approach to improve compressive strength of cement
2023.2.15 The compressive strength development of cement mortar samples under two different curing regimes is given in Fig. 2.The compressive strength of mortars was enhanced with the growth of the duration time whether it was water-cured or CO 2-cured regime.For the hydrated samples, 1d compressive strength was 12.3 MPa, and it
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Specimen size effect on compressive and flexural strength of
2018.4.1 A comprehensive study on compressive strength on HSFRC was conducted by Graybeal and Davis [12].At first, they compared many previous studies, coming to a conclusion that the compressive strength of concrete expressed by smaller specimens is expected to be slightly higher than the strength expressed by larger ones, and that
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Impact of Mixing Methods and Cement Dosage on Unconfined Compressive ...
2022.3.22 The technology of vibratory mixing has been applied to improve the compressive strength of cement-stabilized macadam (CSM). The aim of this study is to investigate the effect of vibration acceleration and cement dosage on the unconfined compressive strength and density of CSM. The mixtures with four cement dosages (2%,
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Effects of Coarse and Fine Crushed Clay Brick Content on the
2022.5.29 The objective of this study is to investigate the compressive strength and microstructural evolution of recycled aggregate concrete (RAC) containing coarse and fine clay brick aggregates. The compressive strength tests, scanning electron microscopy (SEM) observations, and X-ray diffraction (XRD) tests were performed on RAC and natural
MoreHigh temperature effects on different grades of concrete
2021.2.5 Figure 5 shows the compressive strength-temperature variation from the current study of concrete specimens. It is clear from the graph that with increasing temperature, compressive strength decreases irrespective of the grade of concrete. The effect of elevated temperature on the compressive strength is greater for M60 concrete
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A comprehensive investigation into the effect of water to cement
2020.8.30 The compressive strength to cement content curve in RCCP mixtures is shown in Fig. 5 b. As observed, increasing the cement content increases the compressive strength. An increase of 240–340 kg in the cement content, or an increase of 12% to 17% in the C/A ratio, increases the compressive strength for 55%.
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Experimental study of the effect of aggregate type on concrete strength ...
2021.5.1 The ratio of the compressive strength calculated for these two parent rocks is 2.29. As a results, depending on the type of the parent rock, compressive strength differs over an expansive range. Moreover, according to . Conclusion. In this paper, the effect of aggregate type on the compressive strength of concrete and its permeability was ...
MoreExamination of mechanical, permeability, and durability
2023.9.13 While the compressive strength loss of the control concrete was 7.45%, the loss of the concrete produced with 30% natural perlite was 30.99%, which was about four times higher. Losses in compressive strength were almost at the same level with the increase in the proportion of natural perlite up to 100%.
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Effect of carbonation on strength development of cement-treated
2015.8.1 The carbonation of cement-treated soil warrants further discussion as it, too, leads to an increase in strength. Carbonation is a process by which carbon dioxide (CO 2) in ambient air penetrates cementitious materials and reacts with cement hydrates such as calcium hydroxides (portlandite, Ca(OH) 2) and calcium–silicate–hydrate (C–S–H) gel in
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Effect of elevated temperatures on compressive strength of concrete ...
2019.12.30 Vodák [3] suggested that the compressive strength decreases with an increase in porosity based on tests of the strengths and porosities of concrete after drying at temperatures ranging from 25 °C to 280 °C. Likewise, Kodur [16] observed that the compressive strength decreases with increasing temperature (20 °C–800 °C).
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Compressive strength, flexural strength, and durability of
2023.4.24 Increasing the fly ash content beyond 30% in the concrete mix reduces its compressive strength. At 90-day curing, M303 (30% fly ash mix) outperformed all other concrete mixes in compressive strength. After 90 days of curing, the compressive strength of the M303 mix was 20.35% higher than the control mix’s compressive strength.
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A comparative study on the implementation of carbon and
2020.7.19 Fiber-reinforced polymer (FRP) wrapping is one of the current approaches for retrofitting projects. This study aims to compare the performance of carbon and glass fibers in increase of compressive strength and improvement of concrete seismic parameters. In this research, three classes of concrete compressive strength (20, 35, and 50 MPa)
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Study on the Influence of Specimen Size and Aggregate Size
2023.5.19 In the study of the effect of aggregate size on the compressive strength of concrete, Wu et al. prepared three kinds of aggregate size ranges of concrete cubic specimens; the aggregate size ranges were 5–10 mm, 10–16 mm, 16–20 mm, and the uniaxial compression test of the specimen showed that the compressive strength of
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(PDF) Effect of Maximum Aggregate Size on the Strength
2020.6.1 Abstract and Figures. Aggregates form 60% to 75% of concrete volume and thus influence its mechanical properties. The strength of (normal or high-strength) concrete is affected by the maximum size ...
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How Prestressed Concrete Works - MT Copeland
2022.2.2 Prestressed concrete commonly uses high-strength concrete, which is a type of concrete that has a greater compressive strength of 6000 pounds per square inch (PSI) or higher. It is made using durable aggregates, has a high cement content and lower water to cement ratio, and often utilizes superplasticizers to improve workability issues
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Effect of moisture content and porosity on compressive strength
2019.1.20 In this study, the compressive strength of concretes with different water–cement ratios during drying at 105 °C is measured. The results indicate that, with increasing moisture content, the compressive strength decreases initially and then increases. The effect of moisture content on compressive strength increases with the
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