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EFFECTS OF RICE HUSK ASH AND METAKAOLIN ADMIXTURE ON THE PROPERTIES OF RECYCLED CONCRETE
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摘要: 稻壳灰与偏高岭土均是具有火山灰活性的材料。采用稻壳灰和偏高岭土配置复合强化液对再生粗骨料进行化学强化，研究强化液对再生粗骨料性能的改善效果以及强化后再生粗骨料制备的再生混凝土的性能。研究表明：5种不同配比的强化液均可以优化再生粗骨料和再生混凝土的性能；当强化液中稻壳灰与偏高岭土掺量比为3：1时，再生粗骨料的压碎指标较强化前降低了1.5%，空隙率降低了2.4%，表观密度与堆积密度均有所改善，吸水率增加了2.2%；与基准组相比，用强化骨料制备的再生混凝土抗压强度增长了8.6%，抗折强度增长了4.4%，且具有更好的耐磨性。Abstract: Both rice husk ash and metakaolin are pozzolanic active materials. In the experiment,chemical slurry of rice husk ash and metakaolin were used to strengthen the recycled coarse aggregate. The effects of chemical slurry on the properties of recycled coarse aggregate and the properties of recycled concrete prepared were tested. Studies showed that the properties of recycled coarse aggregate and recycled concrete could be optimized by 5 different ratios of chemical slurry. When the mixing ratio of rice husk ash and metakaolin was 3:1, the crushing index of recycled coarse aggregate decreased by 1.5%, the void ratio decreased by 2.4%,the apparent density and bulk density improved,the water absorption increased by 2.2%.Compared with the reference group, the compressive strength of recycled concrete prepared with reinforced aggregate increased by 8.6%, the flexural strength increased by 4.4% and the wear resistance was better.
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