再生黏土砖骨料混凝土配合比参数对性能的影响研究  

The Influence Study of Mix Ratio Parameters on Properties of Recycled Concrete with Waste Clay Bricks as Aggregates

作　　者：杨枫林 赵亚松 高建明[2] Yang Feng-lin;Zhao Ya-song;Gao Jian-ming

机构地区：[1]南通市建设混凝土有限公司,226000 [2]东南大学材料科学与工程学院,南京211100

出　　处：《混凝土与水泥制品》2019年第2期63-66,共4页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51578141);国家"973"计划项目(2015CB655102);国家重点研发计划项目(2016YFE0118200)

摘　　要：使用废弃黏土砖完全替代天然砂和石子制备全再生混凝土,探究了水胶比、水泥用量、粉煤灰和硅灰取代率对再生混凝土性能的影响。结果表明:降低水胶比和增加水泥用量都能够提升砖骨料混凝土抗压强度、降低含水率和增加干表观密度,但对抗压强度的提升存在上限;粉煤灰虽然具有火山灰活性,但作用发挥较慢,掺加会降低28 d前的力学性能和干表观密度。硅灰的加入会明显提升净浆黏聚性,提升力学性能。The recycled concrete was prepared by using waste clay bricks as coarse and fine aggregates.The influence of water-binder ratio,cement dosage,fly ash and silica fume content on properties of recycled concrete was studied.The results show that with the decrease of water-cement ratio or the increase of cement dosage,the compressive strength and dry apparent density of recycled concrete increase,meanwhile the moisture content decreases.But there is an upper limit on the compressive strength.Since the pozzolanic activity of fly ash plays slower,the addition of fly ash could reduce the compressive strength and dry apparent density of recycled concrete before 28 d.The use of silica fume could improve the cohesiveness of paste obviously,therefore,the compressive strength of recycled concrete is improved.

关 键 词：废弃黏土砖 再生混凝土 抗压强度 含水率 干表观密度 

分 类 号：TU522[建筑科学—建筑技术科学]