再生微粉-再生骨料混凝土力学性能及微观结构研究  

Study on mechanical properties and microstructure ofrecycled aggregate-mixed powder concrete

作　　者：于媛[1] 胡慧敏 裴巧玲[1] 杨小妮[1] 宋少花 杨潘[1] YU Yuan;HU Huimin;PEI Qiaoling;YANG Xiaoni;SONG Shaohua;YANG Pan(Huaqing College,Xi an University of Architecture and Technology,Xi an 710043,China;School of Civil and Architectural Engineering,Xi an University of Architecture and Technology,Xi an 710055,China;Key of Structural Engineering and Earthquake Resistance of the Ministry of Education,Xi an University of Architecture and Technology,Xi an 710055,China)

机构地区：[1]西安建筑科技大学华清学院,西安710043 [2]西安建筑科技大学土木工程学院,西安710055 [3]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《功能材料》2022年第8期8147-8152,8175,共7页Journal of Functional Materials

基　　金：国家自然科学基金项目(51878546);陕西省杰出青年科学基金项目(2020JC-46);陕西省重点研发计划项目(2018ZDCXL-SF-03-03-02);陕西省科技创新基地项目(2017KTPT-19);陕西省创新人才推进计划(2018KJXX-056)。

摘　　要：针对大量建筑垃圾处理困难和砂石等自然资源日趋枯竭的矛盾,利用从建筑拆除垃圾中回收的再生骨料(RA)和再生微粉(RP)协同制备了再生骨料-微粉混凝土(RAPC)。分析了再生微粉的矿物组成、微观形貌以及RAPC的抗压强度、劈裂抗拉强度和孔隙特征。研究表明,不同取代率的RA和RP对于RAPC的孔隙结构和力学性能都产生了不同的影响。在相同的RP取代率下,30%的RA发挥了内养护作用,使得RAPC的立方体抗压强度和劈裂抗拉强度达到峰值。在相同RA取代率下,RAPC的抗压强度及劈裂抗拉强度在RP取代率为15%时达到最大值,这是由于RP具有潜在的火山灰活性,与RAPC中的水化产物发生了二次水化反应。不同RA和RP取代率的RAPC的破坏形态有明显区别。通过压汞(MIP)试验研究了RAPC的微观孔隙特征,验证了以上的试验结果。Focusing on the contradiction of difficulty to deal of large amount of construction waste and exhaustion of the sandstone and other natural resources,the recycled aggregate-composite micronized concrete(RAPC)was prepared by recycled aggregate(RA)and recycled mixed powder(RP)recovered from construction waste.The mineral composition and micro morphology of RP,the compressive strength,splitting tensile strength and pore characteristics of RAPC were analyzed.The results showed that the different effects on pore structure and mechanical property of RAPC were produced by RA and RP of different substitution rates.At the same RP substitution rate,the internal curing effect was played by 30%RA.The compressive strength and splitting tensile strength of RAPC reached the peak when the RA substitution rate was 30%.At the same RA substitution rate,the compressive strength and splitting tensile strength of RAPC reached the maximum when the RP substitution rate was 15%,due to the secondary hydration reaction was played between the hydration product of RAPC and RP which had potential volcanic ash activity.The failure modes of RAPC with different RA and RP substitution rates were obviously different.The micro pore characteristics of RAPC were studied by mercury injection test(MIP),and the above test results were verified.

关 键 词：再生骨料 再生混凝土粉 再生砖粉 复合微粉 抗压强度 劈裂抗拉强度 孔隙特征 

分 类 号：TU528[建筑科学—建筑技术科学]