沸石粉对自密实混凝土内养护效果的试验研究.pdf

建界
2015年第36卷第6期
doi:10.3963/j.issn.1674-6066.2015.06.010
沸石粉对自密实混凝土內养护效果的试验研究
肖良丽,荣亚威,向铭铭,陈今东,郑世豪,雷勇
(武汉科技大学城市建设学院,武汉130070)
摘要:论文主要研究沸石粉对自密实混凝土的强度和内养护效果的影响。通过六组108块胶砂龄期分为7d、
28d、90d的试块的抗折和抗压强度以及5组90块混凝土试块的龄期为7d、28d、90d抗压强度的研究显示:掺有0
~4%沸石粉对自密实凝土的胶砂体系强度的内养护效果和强度及掺有0~2%沸石粉对提高自密实凝土的内养护效
果和强度效果最佳;在掺有沸石粉的自密实混凝土的强度和内养护性能可以协调发展,即在改善混凝土内养护性能
的同时,提高混凝土的强度。
关键词:内养护;沸石粉;自密实混凝土;抗压强度
Internal Curing Effect Experimental Research of
Self-compacting Concrete
XIAO Liang-li, RONG Ya-wei, XIANG Ming-ming, CHEN Jin-dong, ZHENG Shi hao, LEI Yong
(School of Urban Construction, Wuhan University of Science and Technology, Wuhan d30070 China
Abstract: The influence of zeolite powder to the strength and the effect of internal curing of self compacting con
crete are mainly discussed in this article. The result of test about the flexural strength and the compressive strength of
motar and the compressive strength of concrete reveals: Motar mixed with 0--2% zeolite powder is the optimal pro-
duction in the effect of internal curing and strength, self-compacting concrete mixed with 0-4% zeolite powder is the
optimal production in the effect of internal curing and strength. The strength and the performance of internal curing of
the self-compacting concrete mixed with zeolite powder can develop coordinately, that is, the internal curing perform-
ance of concrete can be improved while the strength of the concrete is enhanced
Key words: internal curing; zeolite powder; self-compacting concrete; compressive strength
近年来,我国建筑行业对高性能混凝土的需求量越来越大。但是高性能混凝土水灰比一般都较低,并且
高活性矿物掺合料的广泛应用,其二次水化反应又需要更多的水分,加剧了混凝土的早期和后期自收缩,因
而,高性能混凝土的养护是十分必要的,混凝土内养护技术在一定程度上能够解决高性能混凝土收缩开裂问
题。高效的内养护可以减少混凝土的开裂,促进水泥水化及矿物掺合料的二次水化,提高混凝土的强度和耐
久性。该文主要研究常见混凝土掺料沸石粉作为内养护剂对自密实混凝土的强度的影响。
试验
1原材料
1)矿粉,亚东S95矿粉,矿粉的化学成分如表1所示,矿粉性能指标符合《用于水泥和混凝土中的粒化高
炉矿渣》GB/T18046-2008要求。
水泥:采用P?()42.5水泥,其化学成分含量如表1所示。
2)粉煤灰:粉煤灰采用「级粉煤灰,其化学成分含量如表1所示。
收稿日期:2015-10-17
基金项目:武汉科技大学大学生创新项目
作者简介:肖良丽(1973-),副教授. E-rnail: xiaoliang(
wust. edu cn