同掺再生粗细骨料混凝土的力学与耐久性能研究

摘要/Abstract

摘要： 为了探讨同时掺入大掺量再生粗骨料和细骨料制备C40及以上强度等级再生混凝土的可行性,在C45天然骨料混凝土配合比的基础上,采用II类再生粗骨料、I类再生细骨料,以同掺再生粗细骨料质量替代率为25%、50%、75%、100%配制了4组再生混凝土,研究了再生粗细骨料替代率对再生混凝土基本力学性能和耐久性能的影响规律。结果表明:当同掺再生粗细骨料的替代率为25%时,混凝土的力学性能下降很小,替代率为50%、75%的混凝土的抗压强度分别达到C45、C40等级,替代率100%的全再生粗细骨料混凝土的28 d抗压、劈拉、轴压强度和弹性模量等力学性能指标较天然骨料混凝土降低12.0%~23.2%,并达到C35抗压强度等级。增加再生粗细骨料的替代率会降低混凝土的耐久性,但即使是全再生粗细骨料混凝土仍可获得高的耐久性,其抗碳化性能、抗氯离子渗透性、抗冻性能分别达到T-IV、RCM-IV和F300等级,说明在混凝土中同时掺用50%及以上再生粗细骨料配制C40及以上强度等级的再生混凝土是可行的。

关键词: 天然骨料, 再生骨料, 再生混凝土, 力学性能, 耐久性能

Abstract: This investigation intends to explore the feasibility for preparing the C40 and above strength grade recycled concrete with incorporation of large amount of coarse and fine recycled aggregates. For this purpose, based on the C45 grade natural aggregate concrete mix ratio, four recycled concretes were prepared with simultaneous incorporation of Class-II coarse recycled aggregate and Class-I fine recycled aggregate. The following replacement ratios for coarse and fine recycled aggregates were considered: 25%, 50%, 75% and 100% by mass. The results show that the mechanical properties of the recycled concrete decrease very little for the replacement ratio of 25%, and the compressive strength of the two recycled concretes with 50% and 75% replacement ratios reaches C45 and C40 grade, respectively. Compared with the natural aggregate concrete, the 28 d various mechanical properties, such as compressive strength, splitting tensile strength, axial compressive strength and elastic modulus of fully recycled concrete with 100% replacement ratio decrease by 12.0%~23.2%, and reach C35 compressive strength grade. The increase of the replacement ratio of coarse and fine recycled aggregates will reduce the durability of concrete, but even the fully recycled concrete still has high durability, and its resistance to carbonation, chloride ion permeability and frost resistance reach T-IV, RCM-IV and F300 grade, respectively. All these results indicate that it is feasible to incorporate 50% or more coarse and fine recycled aggregates into recycled concrete with strength of no less than C40 grade.

Key words: natural aggregate, recycled aggregate, recycled concrete, mechanical property, durability

中图分类号:

TU528

陈鹏博, 李北星, 殷实, 杨宏天. 同掺再生粗细骨料混凝土的力学与耐久性能研究[J]. 硅酸盐通报, 2022, 41(12): 4300-4309.

CHEN Pengbo, LI Beixing, YIN Shi, YANG Hongtian. Mechanical and Durability Properties of Concrete with Simultaneous Incorporation of Coarse and Fine Recycled Aggregates[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4300-4309.

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