摘要
采用辅助性胶凝材料生产自密实混凝土是混凝土技术发展的方向之一,但目前辅助性胶凝材料掺量在30%左右,无法达到大量减少水泥用量和利用辅助性胶凝材料的目的。进行了大掺量(60%～90%)辅助性胶凝材料自密实混凝土试验研究。结果表明:(1)大掺量辅助性胶凝材料自密实混凝土具有良好的流动度和抗离析、泌水能力;(2)其早期强度和弹性模量虽较低,但后期强度和弹性模型可接近甚至超过未掺辅助性胶凝材料自密实混凝土;(3)辅助性胶凝材料掺量应控制在60%～80%之间,粉煤灰与矿渣掺量比为1:1最佳,可保证该自密实混凝土具有较高的早、后期强度。
Use supplementary cementitious material （SCM） to produce self compacting concrete（SCC） is one of the concrete development directions. But at present,the adding rate of SCM in SCC is about 30%, which results in failing to reduce Portland cement and increase SCM in SCC. SCC with high amount of SCM （60%-90%） were investigated in the present sludy. The results show as following,（1） SCC with high SCM has favorable fluidity and segregation and bleeding resistance, （2） although the early strength and elastic modulus are relatively low, the late strength and elastic modulus of SCC with high SCM are close to or higher than that of SCC prepared by Portland cement,（3） the early mechanieal properties of SCC guaranteed, SCM adding rate should be controlled at 60%-80%, and the oplimal mass ratio oftly ash to BFS is 1：1.
出处
《水泥工程》
CAS
2013年第1期74-77,共4页
Cement Engineering
基金
住房和城乡建设部2011年科学技术项目计划(2011-K3-26)
关键词
自密实混凝土
辅助性胶凝材料
强度
弹性模量
self eompacting concrete
supplementary cementitious material
strength
elastic modulus
