再生粗骨料混凝土界面参数研究

Interface Parameter of Recycled Coarse Aggregate Concrete

对不同再生粗骨料取代率和水灰比下9组混凝土的力学性能及耐久性能进行了测试;基于测试结果及分析,提出了长度界面参数、体积界面参数和广义界面参数的概念,并比较分析了3个界面参数与再生粗骨料取代率、水灰比、力学性能及耐久性能的关系.结果表明:再生粗骨料混凝土的力学性能及耐久性能与再生粗骨料取代率、水灰比紧密相关;广义界面参数可反映界面体积和新砂浆水灰比对混凝土性能的影响,较好揭示了再生粗骨料混凝土性能的劣化机理.

The mechanical and durability properties of nine groups of concrete,with various recycled coarse aggregate(RCA)replacement rates and water-to-cement ratios,were examined.Based on the experimental results and analysis,the length,volume and generalized interface parameters were determined;the correlation between three interface parameters and the RCA replacement rate,the water-to-cement ratio,the mechanical and durability properties were established.The results show that the mechanical and durability properties of RAC are closely related to the RCA replacement rate and the water-to-cement ratio;the generalized interface parameter reflects the effects of interface volume and water-to-cement ratio of new mortar on concrete properties,which reveals the degradation mechanism of RAC properties.