Froudinstou-Yannas [44] also reported that the mixes containing of coarse aggregate with RCA possessed nearly 76% of the compressive strength of natural aggregate concrete. It was also reported by Neville that the coarse aggregate has various effects on the concrete strength depending upon the mix W/C ratio [45] .
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Added an answer on October 15, 2020 at 5:26 pm. The effect of coarse aggregate size in compressive strength of concrete are as follows :-. (1) Coarse aggregate size is directly proportional to the slump (workability) of a fresh concrete with constant water cement ratio. (2) Compressive strength of a concrete increases with …
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This paper investigates the effect of the size and shape of coarse aggregates on the compressive strength of concrete. Concrete strength is affected by the surface texture, grading and maximum aggregate size. Six different sizes of coarse aggregate have been selected for both angular and rounded coarse aggregate. The coarse aggregates were ...
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The compressive strength usually allows a good relationship with other properties of concrete, and it is thus widely used as a quality indicator [20]. To model the impact of coarse RCA on the 28-day compressive strength of concrete as accurately as possible, the three factors discussed above need to be carefully considered.
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compressive strength and split tensile strength of all grades of quarry dust concrete tends to reduce by a certain percentage when water cement ratio was increased from 0.5 to 0.65 in steps of 0.05.
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Aggregate is classified as two different types, coarse and fine. Coarse aggregate is usually greater than 4.75 mm (retained on a No. 4 sieve), while fine aggregate is less than 4.75 mm (passing the No. 4 sieve). The compressive aggregate strength is an important factor in the selection of aggregate.
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The shape of the aggregate particles and its quality, including grading as well-graded aggregate play more vital role on the compressive strength of concrete mixture resulting minimum voids, are ...
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The properties of porous concrete at different ratios—0, 15, 30, 45 and 60%—revealed that RCA is suitable for use as coarse aggregate. The optimum replacement percentage of recycled aggregate for porous concrete in terms of strength is 30%, with 28th-day compressive strength of 17.37 MPa.
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Recycled coarse aggregate 1 (RCA) was treated with silica fume cement 2 (SFC) paste. Subsequently, specimens of two types of concrete were prepared: one with treated RCA 3 (TRCA) and another with natural coarse aggregate 4 (NCA) based on conventional concrete 5 (CC) mixture designs. The slump, cubic, and prism …
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Younis et al. (Younis and Pilakoutas, 2013) examined the impact of various performance parameters of RA (CRA, MRA, and brick coarse aggregate) on the compressive strength of RA concrete and suggested that the OD, LAA, and WA of RA are correlated with the compressive strength.
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Vol. 25, No. l COARSE AGGREGATE, MODULUS, STRENGTH, HIGH PERFORMANCE CONCRETE VA VZZA ^ (a) (b) (c) 7/ (d) (e) Mortar Aggregate FIG.1 Illustration of Composite Models TABLE 3 Measured Dynamic Modulus and Compressive Strength of Cement Mortar and Concretes at Varying Ages Material type Nominal …
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The cubic compressive strength and prismatic compressive strength of recycled coarse aggregate concrete were measured and are listed in Table 7, which was normalized into a data graph as shown in Fig. 6. It can be seen that the cubic compressive strength and prismatic compressive strength of three classes of RAC are all lower …
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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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RAC is processed from solid construction waste. Particles with particle sizes between 75 µm and 4.75 mm are called recycled fine aggregate, while those with particle sizes greater than 4.75 mm are called recycled coarse aggregate [31]pared with natural aggregate, RCCA is coated with a large amount of old mortar, which generally …
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Coarse aggregate (%) and fine aggregate also play significant roles with importance scores of 10.00% and 3.45%, respectively. Compressive strength: Water again proves to be the most critical factor, with an importance score of 59.98%. Coarse aggregate follows closely with an importance score of 48.75%, emphasizing its impact on …
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50.0 mm) of coarse aggregate and six cement contents (150, 200, 250, 300, 350 and 400 kg/m. of concrete) considering water-cement ratio of 0.5 by weight reveal that the strength of concrete ...
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Duan et al. [47] proposed an ANN model to predict the compressive strength of RCA concrete by accounting for the mass of water, cement, sand, natural coarse aggregate and recycled coarse aggregate, water-cement ratio (w/c), fineness modulus of sand, water absorption of aggregates, saturated surface-dried density, …
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The paper examined the impact of coarse aggregates on compressive strength of concrete. Slump and compaction factor tests were conducted on the mixture of quartzite and crushed granite course aggregates, and quarry dust (fine aggregate). Nominal mix (1:2:3) was adopted and mix compositions were calculated by absolute weight method. Twelve …
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It was found that the evolution of compressive strength of recycled aggregate concrete is similar in behavior to the concrete with natural aggregate, except that it is about 10% lower in values.
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The decrease in strength was noticeable, as the CS replacement was over 30% of CSC for both the 7 th day compressive strength and the 28 th day compressive strength, respectively. Fig. 6. Compressive strength of change in the percentage of coconut shell as replacement of coarse aggregates in concrete
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Here, I MC is the compressive strength increase of concrete produced by using coarse marble aggregates instead of coarse aggregates (%), E 1-MC is an equation containing first-degree expressions, E ie-MS is …
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aggregates 6.3.2—Moderate-strength lightweight concrete and associated aggregates 6.3.3—Properties Chapter 7—Recycled aggregates, p. E1-23 ... or Screen Analysis of …
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Twelve (12) cubes (150x150mm) of each type of coarse aggregate were cast for 7, 14, 21, and 28 days to determine their compressive strengths. Quartzite was found to have the highest average ...
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Toanalysis Coarse Aggregate Sources Effects on Compressive Strength of Cement Concrete. Laboratory tests were conducted to find the properties of coarse aggregates from selected 4 river sources and compressive strength test was conducted using UTM machine for altogether 48 cubes. After conducting the test for properties of …
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The experimental results showed that the compressive strength of the samples with coarse aggregates of both 5–10 mm and 10–16 mm cured by 2 days OH curing at −20 °C reached 51.94 MPa, which was higher than samples including single aggregate diameter level, presenting a comparable strength value with 7 days room …
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Accordingly, the compressive strength of normal strength concrete tends to increase as the maximum aggregate size decreases. Therefore, further studies covering …
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At 28th day 10mmcoarse aggregate size gave 23.524 Mpa compressive strength which is themaximum compressive strength …
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Strength of coarse aggregates is difficult to measure. While we talk about the strength of coarse aggregates it refers to the crushing strength of the aggregate itself. However, the required information on strength of coarse aggregates can be obtained from indirect tests: crushing strength of prepared rock samples, crushed value of bulk ...
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The hyperbolic model is suitable for the two-phase composites of coarse aggregate and mortar, and the value of 'p' could reflect the interlocking effect of coarse …
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Aggregate Crushing Value Test – Determine Aggregate Crushing Strength. Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Coarse aggregate crushing value is the percentage by weight of the crushed material obtained when test ...
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