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矿物掺合料对蒸养高强浆体抗压强度及孔结构的影响
作者:熊蓉蓉 龙广成 谢友均 王猛 
单位:中南大学土木工程学院 长沙 410075 
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 
分类号:TU528.31
出版年,卷(期):页码:2017,45(2):175-181
DOI:10.14062/j.issn.0454-5648.2017.02.01
摘要:

为明确胶凝组分对蒸养混凝土性能与孔结构的影响规律,以铁路预制预应力梁、轨道板用典型蒸养混凝土配比及其生产工艺为基础,研究了粉煤灰、矿渣、硅灰及石灰石粉等矿物掺合料对蒸养水泥浆体抗压强度、孔结构的影响,采用胶凝系数指标分析了蒸养条件下不同掺合料的强度贡献以及蒸养浆体抗压强度与孔隙率之间的关系。结果表明:分别掺上述矿物掺合料蒸养浆体28 d龄期后的强度均低于基准试样;本蒸养条件并没有促进粉煤灰火山灰活性的提早发挥,其3、28 d龄期下的胶凝系数较小且两者基本相同,仅约为90 d龄期胶凝系数的20%;而矿渣、硅灰、石灰石粉3 d龄期的胶凝系数显著大于其后期的胶凝系数;随各矿物掺合料的掺入,蒸养浆体28 d龄期、90 d龄期的总孔隙率呈现增加趋势;孔径大于20 nm的较大孔隙对蒸养浆体抗压强度的不利影响要大于孔径小的孔隙。

 

 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.

基金项目:
高铁联合基金(U1534207);国家“973”计划(2013CB036201)资助项目。
作者简介:
熊蓉蓉(1991—),女,硕士研究生。
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