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Effects of aggregate gradation on the properties of lightweight aggregate concrete
lightweight aggregate concrete
Under loading, the stress distribution in lightweight aggregate concrete (LWAC) and the normal weight aggregate concrete (NC) are different. The research use sintered clay lightweight aggregate (LWA) to study the influences of gradation on the concrete properties, such as the unit weight, workability, and the compressive strength. The results were compared with those of NC. Two water cement ratios (w/c=0.7 and 0.4)and three unit gradations (12.5mm,9.5mm,4.75mm) of lightweight coarse aggregate were used in test. The experimental result shows that the influence of aggregate gradation on the unit weight of concrete is limited, because the unit weight of coarse aggregates are similar. The LWAC have the same workability as NC by varying the gradation of aggregate, but LWAC appears better workability than NC as the mix proportion is same. The smaller the Dmax is, the higher the LWAC compressive strength can be achieved. As the w/c is high, the LWAC compressive strength is similar to that of NC. As the w/c is low and the coarse aggregate Dmax large than 9.5mm(#3/8”), the LWAC compressive strength is lower than that of NC.
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