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concassage et criblage de carriere
Full article: Optimization of concrete mix design for
2024.5.4 Compressive strength serves as a critical indicator of concrete performance and structural integrity (Chen et al., Citation 2023; Iffat, Citation 2015; Zhong et al., Citation 2023). Our analysis, presented in Table 7 and Figures 10 and 11, illustrate the progressive increase in compressive strength over the curing period. Notably, concrete ...
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Experimental study to compare the strength of concrete with
2024.4.12 The effect of temperature on the compressive and tensile strengths of concrete containing 0.5%, 1.5%, and 2% polypropylene fibres and with cement contents of 200 kg/m 3, 260 kg/m 3, and 320...
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A systematic review and assessment of concrete strength
2023.7.1 Compressive strength is used as a measure of resistance and the overall quality of concrete [8]. The compressive strength of concrete is conventionally determined by applying increasing axial compression uniformly distributed load
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Revisiting the concept of characteristic compressive strength of concrete
2020.12.10 Characteristic compressive strength. Size effect. Finite-size scaling. Concrete. Strength variability. 1. Introduction. In civil engineering, concrete is mostly used under compression loading configurations since its compressive strength is much larger than its tensile and/or flexural strengths.
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Effects of Fibers on Compressive Strength of Concrete
2023.1.1 The findings obtained demonstrate that the flexicurity and break tensile strength ratios represented as compressive strength and the interaction between these strengths of high-performance steel fiber reinforced concrete with r = 0.94 [13].
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Improving early compressive strength of precast concrete by increasing ...
The increase of active silicon content in precast concrete can greatly improve the early compressive strength of precast concrete (PC) under steam curing conditions. The increase of active silicon content in PC can greatly improve the early hydration process of cement and accelerate the rate of early cement hydration heat release.
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Increasing Concrete Strength - North America
5 天之前 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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Compressive Strength of Concrete Containing Plastic Waste
2021.5.26 While for concrete with a mixture of 5%, the compressive strength drops from 16.54 to 14.56 MPa. Lastly, regular concrete’s compressive strength with a mix of 10 and 15% decrease from 14.41 to 12.68 MPa and from 14.4 to 12.68 MPa, respectively. Therefore, it can be concluded the results do not match our expectations.
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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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Predicting the compressive strength of concrete from its
2020.11.10 The uniaxial compressive strength (UCS) is one of the most important mechanical properties of concrete. This paper aims to demonstrate that the UCS of concrete can be accurately predicted from its compositions and age using the extreme gradient boosting regression (XGB) method.
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Influence of nanomaterials on the workability and compressive strength ...
2022.1.1 The concrete with 5% Nano-TiO 2 improved the compressive strength by 6%, while the addition of super plasticizer and slag powder along with Nano-TiO 2 improved it by 15% [15]. The authors pointed out that the reason for the increase in compressive strength was due to the reduction and change of orientation index in functioning of the
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EFFECT OF CURING METHODS ON THE COMPRESSIVE STRENGTH OF CONCRETE
2011.1.1 100 C) generally accelerates cement hydration. and concrete strength gain at early age. Cur-. ing temperature below 50 F (10 C) are not. desirable for early age strength development. When the ...
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Flexural Strength of Concrete - EngineeringCivil
2020.12.8 Where, fck is the characteristic compressive strength of concrete in MPa. Characteristic compressive strength (MPa) Flexural Strength (MPa) 20: 3.13: 25: 3.50: 30: 3.83: 35: 4.14: 40: 4.43: 45: 4.70: 50: ... Though the modern construction practice uses reinforcement steel to increase the tensile strength of the concrete, the computation of
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Factors Affecting Strength of Concrete - The Constructor
🕑 Reading time: 1 minuteFactors Affecting Strength of Concrete Concrete strength is affected by many factors, such as quality of raw materials, water/cement ratio, coarse/fine aggregate ratio, age of concrete, compaction of concrete, temperature, relative humidity and curing of concrete. Quality of Raw Materials Cement: Provided the cement conforms with the
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Strategies to increase the compressive strength of ultra
2023.10.4 As illustrated in the comparative histogram shown in Fig.2, these microstructural differences lead to an increase in the compressive strength of ultra-lightweight foamed concrete, especially in ...
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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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Increasing the Compressive Strength of Concrete
2022.12.1 From. Table 2 and Figure 2 it is shown that the compressive strength of concrete at 3 days is 68%, 7 days is. 79%, 14 days is 91%, and 21 days is 93%, when compared with the compressive
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Experimental study to compare the strength of concrete with
2024.4.12 At a temperature of 250 °C, an increase in the fibre content decreased the compressive strength in the specimens with a cement content of 200 kg/m 3 and 260 kg/m 3 but increased the compressive ...
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Biochar affects compressive strength of Portland cement
2024.3.6 The superiority of biochars produced from agricultural feedstock over other feedstock types in increasing the compressive strength of Portland cement composites could be attributed to their low molar oxygen/carbon (O/C) ratio, primarily caused by the low carbon contents of biochars (Tables 1 and 2), as lower molar O/C ratio is associated with ...
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Concrete dilation angle increases with increasing compressive strength ...
The experiment was performed on conventional reinforced concrete slab of size 1200 × 1200 mm with a thickness of 50 mm with reinforcement ratio of 0.23%. The slab was impacted under an impacted ...
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Efficient models to evaluate the effect of C - ScienceDirect
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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Investigating the Effect of Various Fibers on Plasticity and
2024.5.8 With the integration of steel fibers, the increase in compressive strength in concrete samples is quite evident, which has many effects on increasing the overall mechanical performance of concrete. The addition of macro syntactic fibers improves the fracture toughness and flexibility of concrete (with a slight increase in compressive
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Best Practice Guidelines for Compressive Strength Testing of Concrete ...
Exposure to temperature extremes also needs to be avoided. Concrete must be cured at a temperature of 19-23 o C in a saturated condition until testing for compressive strength at 7 or 28 days. Test cylinders should be tested in the saturated surface dry condition and should not be allowed to dry out excessively.
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Increasing flexural strength of CO2 cured cement paste by
2023.8.1 The flexural strength and compressive strength of the cement mortar samples were determined using a compression machine from Zhejiang Yiyu Instrument Equipment Co., Ltd., in accordance with ASTM C348 and ASTM C349. The cement paste samples were soaked in ethyl alcohol to stop hydration after carbonation treatment.
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Effect of Carbonation on the Compressive Strength
2021.2.1 The materials used in the experiment are ordinary Portland cement (Class 42.5), sand, laterite and granite chippings. Laterized concrete was produced at 5, 10, 15, 20, 25, 30 and 35% contents of laterite. The properties of the aggregates are presented in Table 1 and illustrated in Figure 1. Concrete was prepared to BS EN 12390-2 (2000), using ...
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Compressive and tensile behaviour of concrete subjected to
2024.1.2 The dynamic compressive strength of concrete increases from 57.5 to 88 MPa with an increase in the strain rate from 72 to 284 s −1 describing the strain rate sensitivity of the concrete. The energy absorption capacity significantly increased from 0.289 to 0.930 J/m 3 as the strain rate increased from 72 to 284 s −1 due to the formation of ...
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Effects of water-cement ratio on bond strength of concrete
2023.1.1 The compressive strength of concrete with varying w/c ratios at curing ages of 7, 14, 21, and 28 days is shown in Fig. 11. The results show that increasing the w/c ratio from 0.4 to 0.6 increases the compressive strength of the concrete. Furthermore, the compressive strength of each w/c ratio increases with curing age.
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Evolution of the early compressive strength of cement-slag
2022.2.16 When the CEA dosage increased to 4%, 6%, and 8%, the growth rate of compressive strength presented a trend of first increasing, then gradually decreasing, and finally increasing again. Their compressive strengths at 72 h were reduced by 40.0%, 53.3%, and 66.5%, respectively. The improvement of compressive strength was attributed to the
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Utilizing Graphite Powder to Improve Concrete
2020.3.8 Polarizing the fresh cement paste has a significant effect on its mechanical properties such that the ultimate compressive strength decreased by 50%, and the failure strain increased by 500%.
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A comprehensive review on pervious concrete - ScienceDirect
2023.12.1 Pervious concrete is comprised of interconnected and interlinked holes and pores, measuring between 2 and 8 mm in length, which provide effective drainage. Additionally, the porosity and empty space of permeable concrete range from 15 % to 35 %, while its compressive strength is between 2.8 and 28 MPa.
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Effect of Fly Ash on Strength of Concrete SpringerLink
2019.10.26 The experimental values for compression, split tension and flexural strength are presented below under separate headings. 4.1 Effect of Fly Ash on Compressive Strength. Figure 3 shows the deviation of percentage of residual compressive strength of standard concrete (SC) with percentage of fly ash. From Fig. 3, the values of
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(PDF) Compressive Strength Enhancement of Pervious Concrete
2022.5.1 The Compressive Strength for Both Normal PC and PP fibre PC After study was done on results for the pervious concrete having the ratio of 1:2, it implied a good improvement which is 30% increase ...
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Experimental Study into the Mechanical Properties of Plastic Concrete ...
2023.9.30 increasing compressive strength and thus with decreasing w/c-ratio or increasing cement content [1]. In literature, various studies have investigated the elastic modulus of Plastic Concrete [10,11 ...
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Influence of Inertia on the Dynamic Compressive Strength of Concrete
2022.9.28 To accurately evaluate the dynamic response of concrete structures under these extreme dynamic loading conditions, Abrams first performed a series of compression tests on concrete with a strain rate of 2 × 10 −4 s −1 and found that the compressive strength of concrete is an increasing function of the strain rate. Later, various ...
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Compressive Strength - an overview ScienceDirect Topics
Fly ash in the construction industry. N.B. Singh, in Handbook of Fly Ash, 2022 19.11.2.1 Compressive strength of geopolymer mortar and concrete. Compressive strengths of geopolymer mortars and concretes develop very fast and show that 100% FA content perform better than the strength of the corresponding control with the same mix
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Improving early compressive strength of precast concrete by increasing ...
2022.8.9 The results show that the compressive strength of cement mortar with 0.02% NGO can be significantly improved by 20.95% at 28d, and the chloride diffusion coefficient can be reduced to 0.29×10 ...
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