大掺量矿物掺合料再生混凝土力学性能和抗碳化性能的试验研究  

Experimental Study on Compressive Strength and Carbonation Profiles of Recycled Concrete with High Mineral Admixture Content

作　　者：黄辰玉 黄利频[1] 黄金峰 吴晨宇 孙宏翔 陈晓慧 HUANG Chenyu

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《福建建设科技》2020年第2期31-34,共4页Fujian Construction Science & Technology

基　　金：福州大学本科生科研训练计划项目(24077)。

摘　　要：设计了再生粗骨料取代率为30%、50%,粉煤灰和矿渣微粉按1:1复掺且掺量为30%、50%的一组再生混凝土,以及一组普通混凝土。以矿物掺合料掺量、再生粗骨料取代率为影响因素,开展大掺量矿物掺合料再生混凝土抗压强度和抗碳化性能的试验研究。结果表明,采用粉煤灰和矿粉复掺技术,较高质量的再生粗骨料、骨料级配良好的条件下,取代率为30%时,再生混凝土的强度均超过了不加矿物掺合料的普通混凝土,取代率增至50%时,强度最低仍可达到55.1MPa。所有配合比再生混凝土28d碳化深度均未超过3.0mm,可不必担心碳化问题。分析了矿物掺合料对再生混凝土强度和抗碳化性能的影响机理。Based on the 30%,50%recycled coarse aggregate replacement ratios,and 30%,50%cement replacement ratios by both fly ash and slag powder respectively,a group of recycled concrete was designed.The influence of different mineral admixture contents and replacement rates of recycled coarse aggregate on the compressive strength and carbonation resistance of recycled concrete was investigated.The test results showed,under the conditions of the high quality of recycled coarse aggregate,30%replacement rate,and the proper aggregate gradation,the compressive strength of recycled concrete was higher than that of normal concrete without mineral admixture.And the minimum strength could reach to 55.1MPa when the replacement rate increased to 50%.The 28d carbonation depth of all recycled concrete was no more than 3.0mm.The influence mechanism of mineral admixture on strength and carbonation resistance of recycled concrete was analyzed.

关 键 词：再生混凝土 抗压强度 碳化 矿物掺合料 再生粗骨料 

分 类 号：TU5[建筑科学—建筑技术科学]