再生粗骨料对再生混凝土力学性能及碳化性能的影响

发布时间：2018-03-05 19:04

本文选题：再生粗骨料　切入点：取代率　出处：《混凝土》2017年12期 　论文类型：期刊论文

【摘要】：与天然骨料相比,再生粗骨料来源复杂且基本性能不稳定,对再生混凝土性能影响较大,因此再生混凝土的应用是工程界十分关注的问题。在普通混凝土的基础上,研究了再生粗骨料的取代率及品质差异对再生混凝土力学性能及碳化性能的影响,研究结果表明:随着RCA取代率的增加,RAC的力学性能及抗碳化性能逐渐降低,且劣于天然骨料混凝土性能,高品质RCA混凝土性能明显优于普通品质RCA混凝土,以掺量100%为例,高品质RCA混凝土比普通品质RCA混凝土抗压强度提高了24.1%,用水量降低了5.6%,碳化深度提高了29.3%;与天然骨料混凝土相比,抗压强度分别降低了5.4%、23.8%,用水量提高了6.1%、12.4%,碳化深度分别提高了29.3%、72.5%。
[Abstract]:Compared with natural aggregate, recycled coarse aggregate has complex sources and unstable basic properties, which has a great influence on the performance of recycled concrete. Therefore, the application of recycled concrete is a problem of great concern in engineering circles. The effects of the substitution rate and quality difference of recycled coarse aggregate on the mechanical properties and carbonation properties of recycled concrete were studied. The results showed that the mechanical properties and carbonation resistance of recycled concrete decreased with the increase of the replacement ratio of RCA. The performance of high quality RCA concrete is obviously superior to that of ordinary quality RCA concrete, taking 100% as an example, the performance of high quality RCA concrete is worse than that of natural aggregate concrete. Compared with natural aggregate concrete, the compressive strength of high quality RCA concrete is increased by 24. 1%, the water consumption is reduced by 5. 6%, and the carbonation depth is increased by 29. 3%. Compared with natural aggregate concrete, the compressive strength of high quality RCA concrete is reduced by 5. 4% and 23. 8%, the water consumption is increased by 6. 1% and 12. 4%, and the carbonization depth is increased by 29. 372.5%, respectively.
【作者单位】：辽宁建筑职业学院;中建三局集团有限公司东北分公司;
【基金】：住房城乡建设部2016年科学技术项目计划(2016-R3-003) 辽宁省百千万人才工程资助项目
【分类号】：TU528

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