硅酸盐学报2017，Vol.45Issue(2)：175-181,7.DOI:10.14062/j.issn.0454-5648.2017.02.01
矿物掺合料对蒸养高强浆体抗压强度及孔结构的影响
Influence of Mineral Admixtures on Compressive Strength and Pore Structure of Steam-Cured High-Strength Cement Paste
摘要
Abstract
The influences of mineral admixtures including fly ash (FA), slag, silica fume and limestone powder on the compressive strength and pore structure of steam-cured high-strength cement paste were investigated based on typical mix proportions of steam-cured concrete and the corresponding production technology used in steam-cured pre-stressed beam and track slab. The parameter of cementitious coefficient was employed to analyze the strength-contribution of mineral admixtures on paste. And the relationship between compressive strength and pore structure of paste was also discussed. The results show that the strength of steam-cured paste with mineral admixtures after 28 d age is lower than that of control sample without mineral admixtures. Under steam-curing condition, the pozzolanic activity of fly ash shows no obvious acceleration and the cementitious coefficient of FA at 3 d or 28 d age is low and only approximately 20% of that at 90 d. The cementitious coefficient of slag, silica fume and limestone powder at 3 d is significantly greater than that at later ages. The total porosity of steam-cured paste at both 28 d and 90 d increases with the increasing the mineral admixture. Pore with diameter of over 20 nm has a great negative impact on compressive strength of steam-cured paste.关键词
蒸养高强浆体/矿物掺合料/抗压强度/孔隙结构/胶凝系数Key words
steam-cured/high-strength paste/mineral admixture/compressive strength/pore structure/cementitious coefficient分类
建筑与水利引用本文复制引用
熊蓉蓉,龙广成,谢友均,王猛..矿物掺合料对蒸养高强浆体抗压强度及孔结构的影响[J].硅酸盐学报,2017,45(2):175-181,7.基金项目
高铁联合基金(U1534207)；国家“973”计划(2013CB036201)资助项目。 （U1534207）
