Strengths than larger coarse-grained aggregate. Cook observed that the difference in compressive strengths due to **aggregate** size is increasing with a decreasing water-cement ratio and an increasing test age. Smaller coarse-grained aggregate also increases the flexural strength of concrete. For dosing the mixture, the bulk unit weight (a, k, a).

Bulk density measures the volume that the graded aggregate will occupy in the concrete, including solid aggregate particles and the voids between them. Since the weight of the aggregate depends on the moisture content of the aggregate, a constant moisture content is required. This is achieved through the use of an OD aggregate. In addition, the bulk density is required for the method of dosing the mixture by volume.

Leveling limits and maximum aggregate size are specified because these properties affect the amount of aggregate used, as well as cement and water requirements, workability, pumpability, and concrete durability. With 100% recycled aggregate content, the compression performance of concrete was very close to that of control concrete due to the unique style of aggregate used. Therefore, it is desirable to minimize the amount of paste consistent with the production of concrete that can be handled, compacted and finished while providing the necessary strength and durability. Aggregate is commonly considered inert filler, accounting for 60 to 80 percent of the volume and 70 to 85 percent of the weight of concrete.

The difference in compressive value of content 16.7% was lower than that of content 33.3% between recycled concretes with aggregate groups of A, B and C. Where is the additional water consumption in the concrete mix; is the mass of recycled aggregate in the concrete; and are the water contents of recycled aggregate and ordinary aggregate, respectively; and are the water absorption of recycled aggregate and ordinary aggregate, respectively; is the mass of recycled concrete; and is the percentage of recycled aggregate in total concrete aggregate. Second, Wang's experimental studies showed that the compressive strength of concrete has no obvious regularity with the content of recycled aggregates. In order to dose the mixture, it is important to know the space occupied by the aggregate particles, including the pores within the particles.

The classification or size distribution of the aggregate is an important characteristic because it determines the paste requirement for workable concrete. This article investigated the influence of aggregate size on the strength performance of recycled **aggregate concrete** using unconfined pressure tests. Figure 5 shows the relationship between the compressive strength of recycled concrete with aggregate groups A, B and C and the replacement ratio of recycled aggregate in the same ratio of water to cement. This was mainly due to the bonded mortar content of aggregate group C, which was lower than that of aggregate groups A and B.

Concrete mixes of one hundred and sixty-two concrete samples were poured into a polyvinyl chloride mold with a dimension of 150 mm × 150 mm × 150 mm to measure compression, strength. and the modulus of elasticity of recycled aggregate concrete. The final result data were determined from the average of triplicate measurements of each concrete sample to ensure the accuracy of compressive strength and modulus of elasticity. Recycled aggregate was washed to reduce the negative effects on recycled concrete because good gradation of coarse-grained aggregate is one of the factors guaranteeing the stability properties of concrete.

Recycled concrete is a viable source of aggregate and has been successfully used in granular subbases, soil cement and new concrete. .

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