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分别研究了水灰比、砂率和砂类型对水泥混凝土工作性能和力学性能的影响。结果表明:水灰比增加,混凝土的综合工作性能、抗压强度和耐磨性能降低。混凝土的综合工作性能随着砂率降低而降低,而混凝土的耐磨性则随着砂率的增加而降低。砂率对混凝土的抗压强度影响不大,混凝土的砂率不应太低或太高。在相同配比情况下的4种砂配制的混凝土,石灰岩机制砂混凝土的工作性与河砂混凝土的工作性能相差不大,抗压强度比河砂混凝土的高9.1%,混凝土的磨损量仅为河砂混凝土的78.1%,耐磨性较好,配合比本身所用减水剂不到河砂混凝土的50%,具有较好的经济性。因此,在水泥混凝土中,石灰岩机制砂能够很好地替代河沙。
The effects of water cement ratio, sand rate and sand type on the workability and mechanical properties of cement concrete were studied respectively. The results show that: the water-cement ratio increases, the overall performance of concrete, compressive strength and wear resistance decreased. The overall performance of concrete decreases with the decrease of sand rate, while the wear resistance of concrete decreases with the increase of sand rate. Sand rate has little effect on the compressive strength of concrete, concrete sand rate should not be too low or too high. In the same proportion of 4 kinds of sand prepared concrete, limestone mechanical properties of concrete and river sand workability of concrete or less, compressive strength higher than 9.1% of river sand concrete, concrete wear is only 78.1% of river sand concrete has good abrasion resistance, and the water reducing agent used in the mixing ratio is less than 50% of river sand concrete, which has good economy. Therefore, in cement concrete, limestone mechanism sand can well replace river sand.