摘要
用C30普通混凝土制备再生骨料,然后以再生骨料置换天然碎石制备再生混凝土.探讨了再生骨料对再生混凝土性能和孔结构的影响.结果表明:由于附着水泥砂浆的作用,再生骨料的品质较天然碎石有所降低,从而致使再生混凝土的坍落度和抗压强度下降;当再生骨料置换率低于40%(质量分数)时,再生混凝土与基准混凝土具有相似的性能;再生骨料主要使混凝土毛细孔孔隙量和凝胶孔孔隙量有较大的增加,而对大于10μm的细孔孔隙量则无明显影响.
C30 grade concrete was prepared to produce the recycled aggregate with different mix proportion to replace natural aggregate in concrete. The properties of recycled aggregate, the properties and pore structure of recycled concrete were investigated. The results show that the recycled aggregate has relatively lower quality than natural aggregate, consequently the recycled concrete has low slump and low compressive strength. However the recycled concrete has almost the same quality as control concrete if the replacement ratio of recycled aggregate is under 40 %. The recycled aggregate has no remarkable effect on percentage of pores with a diameter larger than 10μm in concrete, but makes the capillary and gel pores increase.
出处
《建筑材料学报》
EI
CAS
CSCD
2006年第2期142-147,共6页
Journal of Building Materials
基金
北京市优秀人才培养专项经费资助项目
关键词
废旧混凝土
再生利用
混凝土性能
孔结构
孔隙分布
waste concrete
recycling
properties of concrete
pore structure
pore distribution
