《大掺量硅灰粉煤灰对水泥浆体干燥收缩和强度的影响》-毕业论文.doc

PAGE XXIX 摘 要 本论文以大掺量硅灰、粉煤灰的水泥浆体为研究对象，研究了相同水灰比下不同掺合料对水泥石干燥收缩和强度的影响。水泥浆中掺加粉煤灰干缩减少，随着粉煤灰掺量的减小，试件干缩增大，但不是很明显。硅灰替代水泥后增大水泥石的干缩。研究表明，大掺量粉煤灰会影响水泥石的强度，但复掺硅灰粉煤灰能够显著改善水泥石早起和后期强度。本文同时也测量了水泥石的孔隙率，从而分析孔隙率与水泥石干燥收缩和强度的关系。掺加粉煤灰与不掺粉煤灰的混凝土相比，混凝土总孔隙率明显下降。 关键词：硅灰、粉煤灰、复合水泥浆体、干燥收缩、水泥石孔隙率 Abstract In this thesis, high content of silica fume, fly ash cement paste as the research object ofthe same water-cement ratio cement paste of different admixtures on drying shrinkage and strength. Fly ash slurry to reduce shrinkage, decrease with fly ash, specimen shrinkage increased, but not very obvious. After the increase of silica fume replacementof cement shrinkage of cement paste. The results show that high volume fly ash will affect the strength of cement, but re-silica fume cement fly ash can significantly improve the strength of early and late. This paper also measured the porosity of cement, to analyze the porosity and cement the relationship between drying shrinkage and strength.Fly ash concrete with no fly ash compared to the total porosity of concrete decreased. Keywords: Silica fume, Fly ash, Composite cement paste,Drying shrinkage,Cement porosity 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc6288 摘 要 PAGEREF _Toc6288 I HYPERLINK \l _Toc32174 Abstract PAGEREF _Toc32174 II HYPERLINK \l _Toc20293 目录 PAGEREF _Toc20293 III HYPERLINK \l _Toc17495 第1章 前言 PAGEREF _Toc17495 1 HYPERLINK \l _Toc8592 1.1混凝土的发展历史及现状 PAGEREF _Toc8592 1 HYPERLINK \l _Toc9928 1.2 水泥混凝土干缩机理 PAGEREF _Toc9928 2 HYPERLINK \l _Toc2534 1.2.1 水泥混凝土干缩 PAGEREF _Toc2534 2 HYPERLINK \l _Toc27628 1.2.2 干缩的测量及影响因素 PAGEREF _Toc27628 7 HYPERLINK \l _Toc14504 1.3硅灰、粉煤灰对水泥浆体的影响 PAGEREF _Toc14504 10 HYPERLINK \l _Toc31546 1.3.1 粉煤灰 PAGEREF _Toc31546 10 HYPERLINK \l _Toc30118 1.3.2 硅灰 PAGEREF _Toc30118 12 HYPERLINK \l _Toc19114 1.3.3双掺粉煤灰、硅灰作用机理探讨 PAGEREF _Toc19114 13 HYPERLINK \l _Toc7863 1.4水泥石中的孔隙率与干缩的关系 PAGEREF _Toc7863 14 HYPERLINK \l _Toc2418 1.5小结 PAGEREF _Toc2418 15 HYPERLINK \l _Toc13325 第2章