养护方式对再生混凝土抗碳化性能的影响
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TU528

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国家自然科学基金资助项目(51408192);中央高校基本科研业务费专项资金资助项目(B200202232)


Effect of Curing Method on Carbonation Resistance of Recycled Concrete
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    摘要:

    通过实验室加速碳化试验,研究了养护方式和再生粗骨料取代率对混凝土抗碳化性能的影响。结果表明,在其他条件不变的情况下,养护剂养护下混凝土的碳化深度最小,洒水养护和覆膜养护下混凝土的碳化深度依次增大。混凝土碳化深度随再生粗骨料取代率的增加而增大,与普通骨料混凝土相比,再生粗骨料取代率为50%的混凝土部分碳化区尺寸和碳化前沿深度分别增大了7.5%和23.7%,而再生粗骨料取代率为100%的混凝土两者分别增大了21.3%和55.3%。通过吸水特性试验分析了养护方式及再生骨料取代率对混凝土抗碳化性能的影响机理,结果表明,养护剂养护下的混凝土毛细吸水系数最小,洒水养护和覆膜养护下混凝土的毛细吸水系数依次增大;混凝土毛细吸水系数随再生粗骨料取代率的增加近似呈线性增大。

    Abstract:

    Through the accelerated carbonization test in laboratory, the effects of curing method and the replacement rate of recycled coarse aggregate (RCA) on the carbonation resistance of concrete were studied. The results show that the carbonization depth of concrete with curing agent is the smallest under other conditions unchanged, followed by water spray curing and film curing. The carbonation depth of concrete increases with the increase of the replacement rate of RCA. Compared with the ordinary aggregate concrete, the size of the partial carbonization zone and the depth of the carbonization front of concrete with 50% replacement rate of RCA are increased by 7.5% and 23.7%, respectively, while the increase rates are 21.3% and 55.3% for the concrete with 100% replacement rate of RCA, respectively. The influence mechanism of the curing method and the replacement rate of RCA on the carbonation resistance of concrete is analyzed through the water absorption characteristics test. The results show that the capillary water absorption coefficient of concrete cured with curing agent is the smallest, which that cured with sprinkler and film increases in turn. The capillary water absorption coefficient of concrete increases approximately linearly with the increase of the replacement rate of RCA.

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蒋建华,陈思安,赵克寒,余亚兵,朱照钰.养护方式对再生混凝土抗碳化性能的影响[J].河北工程大学自然版,2022,(4):12-17,25

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  • 收稿日期:2022-03-01
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  • 在线发布日期: 2022-12-29
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