摘要
为了利用建筑垃圾制备高性能再生混凝土,将粉煤灰和硅灰以单掺和复掺的方式加入到再生混凝土中后,研究了不同再生骨料取代率条件下再生混凝土抗压性能及微观结构的变化情况。研究发现在再生混凝土中单掺粉煤灰后,在水化早期,随着再生骨料取代率的不断增加,再生混凝土的强度也是存在逐渐减小的趋势,但是随着水化龄期的增加,再生骨料取代率对强度的影响不再有明显的差异。采用粉煤灰与硅灰复掺以后,随着再生骨料取代率的不断增加没有发现强度发生明显降低的现象,并且水泥浆体的微观结构也是趋于致密。
In order to produce high - performance recycled concrete by building waste, fly ash and silica fume were mixed into recycled con- crete separately and jointly. The variation tendency of compressive strength and mierostructure were studied. It is demonstrated that with the in- crease of recycled aggregate replacement rate the early compressive strength of recycled concrete decreased when mixed by fly ash only, but the in- fluence of recycled aggregate replacement rate on compressive strength is not obvious with the development of hydration age. When mixed fly ash and silica fume into recycled concrete jointly, the compressive strength did not decrease significantly with the increase of recycled aggregate replace- ment rate, and the mierostrueture tends to be more densely.
出处
《粉煤灰综合利用》
CAS
2013年第4期17-20,共4页
Fly Ash Comprehensive Utilization
基金
教育部春晖计划项目(Z2011004)
关键词
再生混凝土
矿物掺合料
高性能再生混凝土
微观结构
再生骨料取代率
recycled concrete
mineral admixture
high - performance recycled concrete
microstructure
recycled aggregate replacement rate
