摘要
大掺量粉煤灰混凝土（HVFAC）因其具有的绿色节能优势和可持续发展潜力而受到业界青睐和重视。然而这类混凝土往往因早期强度偏低、凝结硬化慢而遭受质疑和诟病。从同时优化粉煤灰和水泥的粒度,以较粗粉煤灰混入较细水泥的思路出发,以大掺量粉煤灰砂浆作为研究对象,试验探究了胶凝材料粒度优化技术用于改善HVFAC早期性能的可行性。研究结果表明：同时增大水泥的比表面积和减小粉煤灰的比表面积,可制备早龄期性能符合要求的HVFAC。
High Volume Fly Ash Concrete（ HVFAC） has been widely used due to the advantages of green energysaving and sustainable development potential. However,HVFAC is often questioned and criticized for its low initial strength and delayed setting and hardening. In the paper,a method of optimizing particle sizes of cement and fly ash for improving the early-age performance was proposed. By blending large-particle fly ash into small-particle cement,the early-age strength,initial and final setting times and quasi-adiabatic temperature rise of the mortar specimens containing high volumes of fly ash were reasonably improved. The results showed that HVFAC could meet the requirements of the early-age performance when the specific surface area of cement increased,and meanwhile,the specific surface area of fly ash decreased.
作者
童慧芝
沈万岳
TONG Huizhi;SHEN Wanyue(Zhejiang Tongji Vocational College of Science and Technology, Hangzhou 311251, China;Zhejiang College of Construction, Hangzhou 311231, China)
出处
《工业建筑》
CSCD
北大核心
2018年第3期122-126,共5页
Industrial Construction
基金
2015年度浙江省水利厅科技项目(RC1551)
关键词
颗粒尺寸
早期性能
大掺量粉煤灰混凝土(HVFAC)
抗压强度
拟绝热温升
凝结时间
particle size
early-age performance
high volume fly ash concrete （ HVFAC ）
compressive strength
quasi-adiabatic temperature rise
setting time
