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Effects of Coarse Aggregate Size on the Compressive Strength of Concrete. This study investigates the effect of aggregate size on the compressive strength of concrete. Two nominal mixes, that is, 1:2:4 and 1:3:6 were used in the study. Concrete cubes were produced with 6, 10, 12.5, 20 and 25 mm aggregates for the two nominal mixes and they were ...
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compressive strength and increases shrinkage in the resulting concrete [19]. However, the exact mechanism by which these clays in coarse aggregate affect the properties of concrete has not been established. Therefore, the effect of clay particles in coarse aggregates on concrete compressive strength is central to this experimental study.
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Even so, it was hypothesised that as the standard deviation of the water absorption of recycled coarse aggregate increases over a wide range, the compressive strength of HPC will first increase ...
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compressive strengths, while in normal-strength concretes; coarse aggregate strength has little effect on compressive strength. While Özturan and Çeçen (2007) compared the effects of limestone and basalt on the compressive strength of high-strength concrete in their research and concluded that concrete
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Compressive strength of cubes is 21.26N/mm2, 23.41N/mm2, 23.66N/mm2, and 24.31N/mm2 for coarse aggregate sizes 13.2mm, 19mm, 25.0mm and 37.5mm respectively. That of …
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Additionally, by replacing all aggregates with CGFAs and coal gangue coarse aggregates, the 28 d compressive strengths of samples W0.5R100 and W0.4R100 were 44.8 and 52.24 MPa, respectively, which ...
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This paper presents a study on the compressive strength of concrete using recycled aggregates. The concrete was designed to have a 25MPa compressive strength and an 8cm slump. The rates of replacing natural aggregates with recycled coarse were 0%, 10%, and 20%. The test samples were compressed to determine their compressive strength value …
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The effects of content and particle size distribution of coarse aggregate on the compressive strength of concrete have been investigated (Meddah, Zitouni, and Belâabes 2010). Three types of ...
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Compressive strength of the specimens at the middle layers was up to 30 % higher than those at the top and bottom layers. The inferior compressive strength was primarily ascribed to the worsened distribution of CAs and higher voids in the top layer. ... The addition of coarse aggregate (CA) to UHPC can reduce the use of cementitious materials ...
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To evaluate the effect of maximum coarse aggregate size on the compressive strength of the UHSC mixtures in this paper, the compressive strength against aggregate …
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In this study, according to the Chinese standard (GB/T 14685-2011) [39], the crushing index method was used to evaluate the compressive strength of crushed stone, …
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Full Article. Compressive Strength of Light-Weight Concrete Material Made from Treated Wood Waste as a Coarse Aggregate. Murtada Abass A Alrubaie, a, * Salam Wtaife, a Zahraa Hussein Joudah Alsafy, a,b and Nur Hafizah Abd Khalid b The effect of replacing the conventional coarse aggregate with wood shavings was evaluated relative to the 28-day compressive strength of …
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At a water to OPC ratio of 0.4, CMT concrete demonstrates higher compressive strength (CS) than the control blend up to 40% replacement (90-day CS). The same trends …
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Keywords— Coarse Aggregate, Compressive Strength, Grading of Aggregate, Source, Size I. INTRODUCTION Cement, water, sand, aggregates and sometimes admixtures are the ingredients of concrete. The mixing of these materials in specified proportions produce concrete. The strength of concrete is influenced by ratio of cement to mixing water, ratio ...
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Although the simulations were based on standard specimens from the laboratory, the results showed good agreement with the documented experimental results. Briefly, at a …
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As illustrated in Figure 14, the compressive strength is maximum at q = 0.23, and the compressive strength of UHPC-CA first increases and then decreases with the increase of coarse aggregate content. It demonstrates that the volume fraction calculated according to ( 7 ) may be the optimal value or pretty close to it.
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between the maximum coarse aggregate size and the compressive strength follows a polynomial with R 2= 1; indicating that the model is reliable. The optimum maximum coarse aggregate size for the best compressive strength of 28 day concrete was therefore found to be 8mm for the water/cement ratio of 0.63. The analysis
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Effects of Compressive Strength With and Without Coarse Aggregate on High Strength Concrete by using Fly Ash and Silica Fume .More specifically the project work has been carried out. a) To find out the compressive strength of granite …
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The main objective of this research is therefore to evaluate the influence of replacing natural fine and coarse aggregate on the 3-, 7- and 28-day compressive strength of concrete using machine ...
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Question: Solve the following mix design problem. Given: Specified compressive strength of concrete = 4000 psi Maximum size of coarse aggregate = ¼ in. Specific gravity of coarse aggregate (CA) = 2.7 Dry-rodded density of CA = 105 lb/ft3 Specific gravity of fine aggregate (FA) = 2.6 Specific gravity of cement = 3.15 Fineness modulus of FM = 2.6 Non-air-entrained
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The compressive strength and flexural strength of coarse aggregate showed that the 25% replacement produces low-stress lightweight slab (Olutoge 2010). However, the coarse aggregate reduced 7.43% cost per cubic meter …
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The compressive strength changes with aggregate size can be mainly attributed to the effect of aggregate size on pores characteristics and cementitious paste thickness. It is found that the compressive strength is most sensitive to the content of the small pores (0–1.5 mm 2). The increase of the small pores content will decrease the ...
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3.1.2 Effect of Coarse Aggregate Size on Concrete Compressive Strength: The compressive test results are presented in the Table 2. Table 2: Compressive Strength Result after 28 Days of Curing
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The degree of strength reduction in RCA concrete does vary with each source aggregate. Froudinstou-Yannas also found that some mixes replacing 100 % of coarse …
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Coarse Aggregate: The fraction from 20 mm to 4.75 mm is used for coarse aggregate in this project. Generally there are 2 types of coarse aggregate is used coarse aggregate I (grit, which is 10 mm down) and coarse aggregate II (20 mm down). Recycled Concrete Aggregate: The C&D waste was collected from Varachha Road near old
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Sahin et al. [12] have observed that the increase in strength for a given increase in cement content depends on the type of aggregate used and the cement content itself while Özturan and Çeçen [9] have found that for the same properties of paste, different types of CA with different shape, texture, mineralogy and strength may result in different concrete strengths.
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Explanation: As per IS code guidelines for methods of tests for strength of concrete. Some of the important recommendations regarding testing of compressive strength are listed below:. Specimen size: Normally 150 x 150 x 150 mm cube is used as specimen if maximum coarse aggregate size = 38 mm but if maximum nominal size of aggregates is less …
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The pervious concrete utilising recycled coarse aggregate (RCA) is known as sustainable pavement material which has 15-35% void content of the total volume. This study aims to improve the compressive strength of pervious concrete containing RCA as coarse aggregate. Three pre-treatment methods on RCA were applied in the experiment.
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1)Compressive Strength. The maximum strength shown by aggregates when subjected to compression gives their compressive strength. It is to be remembered that crushed stones are obtained from by squashing large-sized boulders. Therefore, aggregates are intrinsic materials and their compressive strength depends largely on the rock type that is …
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Using same mix design, coconut shell concrete was prepared by replacement of conventional crushed coarse aggregate (CA) with waste coconut shell (CS). Coconut shell replaced conventional aggregate by 10%, 20%, 30% and 40% respectively (by volume) and the effect on compressive strength and density of concrete was observed.
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