较大偏高岭土掺量下偏高岭土-水泥硬化浆体性能与微观结构.pdf

第18卷第3期
筑材料学报
Vol 18, No.3
2015年6月
JOURNAL OF BUILDING MATERIALS
Jun.,2015
文章编号:1007-9629(2015)03-0393-07
较大偏高岭士掺量下偏高岭土ー水泥硬化浆体
性能与微观结构
乔春雨,倪文,王长龙
(北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083)
摘要:研究分析了較大偏高岭土(MK)摻量下偏高岭土ー水泥(MK-OPC)硬化浆体的强度、化学结
合水量、MK反应量、Ca(OH)2含量、徽观形貌和孔径分布.结果表明:在50%MK摻量(质量分数)
范围内,随着MK摻量增加,MK-OPC砂浆的强度增长速度加快;MK-OPC砂浆长期强度基本高
于纯水泥砂浆.随着MK掺量增加, MK-OPC净桨的MK反应量增加、Ca(OH)2含量大幅减少
微观结构致密、孔结构细化,MK反应量和增强效应因子与d≤10nm孔体积增量均呈正比关系,
关键词:偏高岭土;强度;火山灰反应;孔径分布
中图分类号:TU528.0文献标志码:A
doi:10.3969/j.issn.1007-9629.2015.03.007
Properties and Microstructure of Metakaolin(MK)-cement Hardened Slurry
with High Use Level of MK
QIAO Chunyu, NI Wen, WANG Changlong
( Key Laboratory of the Ministry of Education of China for High-efficient Mining and
Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China)
Abstract: The strength, non-evaporable water content, metakaolin(MK) reaction amount, Ca(OH)2 con
tent, microtopography and pore size distribution of metakaolin-cement(mk-opc) hardened slurry with
high use level(by mass) of MK were studied. The results indicate that mortar strength increasing rate ac
celerates as the use level of MK increases within% range and the strength of MK-OPC mortar is mostly
larger than that of plain cement mortar. For MK-OPC pastes, as the use level of MK increases, MK reac
tion amount increases, Ca(OH) content decreases, microstructure becomes densification and pore struc-
ture refines. MK reaction amount or strengthening factor is in direct proportion to volume increment o
pores with d3≤10nm
Key words: metakaolin(MK); strength; pozzolanic reaction; pore size distribution
偏高岭土(MK)是高火山灰活性微粉,由高岭反应程度无明显不同. Neyisi等2和Poon等认为
土在700~800℃条件下脱水得到.MK越来越多地MK是一种优质的矿物掺合料,能提高混凝土的强
被运用到混凝土工业中. Justice等研究了8%低度和耐久性,钱晓倩等研究了掺MK高性能混凝
掺量”不同细度MK对混凝土强度的影响,结果表土的物理力学性能,认为在混凝土中掺入10%
明,MK细度越大,混凝土强度越高,但MK火山灰15%MK能有效提高混凝土的轴拉强度. Shekarchi
收稿日期:2013-10-24;修订日期:2013-11-20
基金项目:国家高技术研究发展计划(863计划)项目(2012AAG62405)
第一作者:乔春雨(1989~),男,河北河间人,北京科技大学博士生.E-mail:qiaochunyu1989@gmail.com
通信作者:倪文(1961-),男,河北香河人,北京科技大学教授,博士生导师,博士.E-mail: nien@ces.ustb.edu,cn
1)文中涉及的摻量、水胶比等除特别说明外,均为质量分数或质量比