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Effect of Phosphorus Slag on the Performance of Roller Compacted Concrete

机译：磷渣对碾压混凝土性能的影响

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As a kind of industrial wastes, phosphorus slag has high pozzolanic reactivity and is almost in every province in China. This paper studied the effect of phosphorus slag on the performance of roller compacted concrete. The results shows that the setting time of roller compacted concrete would been delayed since adding phosphorus slag to the roller compacted concrete, and this phenomenon will be more obvious if adding more phosphorus slag. At this paper, if phosphorus slag dosage was 45%, then the initial setting time would be about 236% times of that of roller compacted concrete without phosphorus slag, and the final setting time would be about 207% times. Adding phosphorus slag to the cement, the heat of hydration of cementitious materials would be reduced. In this test, as phosphorus slag content was 45%, the heat of hydration at 3 d was 62. 8% that of the pure cement without adding phosphorus slag, as well as, the heat of hydration at 7 d was 76. 0%. Consequently the adiabatic temperature rise would be reduced. Early strength of roller compacted concrete mixed with proper content of phosphorus slag maybe lower, but the long-term strength would be higher than the reference concrete. This showed that phosphorus slag has high pozzolanic reactivity. Adding phosphorus slag to the roller compacted concrete would increase the ultimate tensile value and reduce the modulus of compressive elastic, and accordingly the crack resistance of roller compacted concrete could be improved. It maybe increase the drying shrinkage of concrete in early age by adding phosphorus slag, however, the drying shrinkage was as same as that of the reference concrete at the age of 90 d. Therefore, phosphorus slag is especially suitable for mass concrete.
机译：磷渣作为一种工业废物，具有很高的火山灰反应性，几乎在中国每个省份都存在。本文研究了磷渣对碾压混凝土性能的影响。结果表明，由于在碾压混凝土中加入磷渣，会延缓碾压混凝土的凝结时间，如果加入更多的磷渣，这种现象将更加明显。在本文中，如果磷渣用量为45％，则初始凝固时间约为不含磷渣的碾压混凝土的236％，最终凝固时间约为207％。在水泥中添加磷渣，将减少水泥质材料的水化热。在该试验中，由于磷渣含量为45％，在3 d时的水化热为不添加磷渣的纯水泥的62. 8％，而在7 d时的水化热为76. 0％ 。因此，绝热温升将减小。掺入适量磷渣的碾压混凝土的早期强度可能较低，但长期强度会高于参考混凝土。这表明磷渣具有较高的火山灰反应性。在碾压混凝土中添加磷渣可提高极限抗拉强度，降低压缩弹性模量，从而可提高碾压混凝土的抗裂性。加入磷渣可能会增加早期混凝土的干燥收缩率，但其干燥收缩率与90 d时的参考混凝土相同。因此，磷渣特别适合于大体积混凝土。

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