大掺量矿物掺合料复合水泥浆体的化学结合水与孔结构的研究

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摘要

粉煤灰和硅灰现已成为高性能水泥中必不可少的性能调节型辅助性胶凝材料，确定水泥浆体中粉煤灰或硅灰的反应程度，对评价它们的反应活性及其对该系结构形成的贡献、研究反应动力学等具有重要意义。本论文以复掺硅灰、粉煤灰的水泥浆体为研究对象，通过测定掺粉煤灰和硅灰复合水泥浆体不同龄期的非蒸发水量来了解粉煤灰和硅灰对水泥水化过程的影响。实验用简单干燥的方法测量非蒸发水量。随着水化龄期的增加，初期非蒸发水含量逐渐上升，随后略有下降，后期非蒸发水含量又逐渐增加；随着硅灰含量的增加，早起水化速率逐渐增加；粉煤灰有助于水泥后期水化进程。同时利用氮吸附法测量水泥石孔结构，从而在微观孔结构和宏观干缩 建立了关联。加入硅灰和粉煤灰都极大的改善了孔径分布，使孔径范围不断缩小，硅灰和粉煤灰皆具有填充效应，在水化早期硅灰对孔结构的影响主要是水化反应生成硅酸钙凝胶，粉煤灰在早期则起着填充效应，实验表明它们对改善0-20nm范围的孔径尤为显著。

关键词：硅灰、粉煤灰、非蒸发水、复合水泥浆体、孔结构。

安徽建筑工业学院本科生毕业设计

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Abstract

Fly ash and silica fume have become absolutely necessarily bindingmaterials in cement

industry. To make sure the reaction degree of fly ash and silica fumein cement pastes is

very important. It is significant in evaluating thereactiveactivity of fly ash and silica fume,

estimating the contribution to thestructure，researching the reactive kinetics. This thesis

acted complex-doped silica fume, fly ash cement paste as the research object by measuring

the non-evaporative water of the fly ash and silica fume cement paste composite of

different ages understood the role of the fly ash and silica fume in the cement hydration

process .The experiment used a simple method of drying to measure non-evaporative water

weight of the fly ash and silica fume cement paste composite of different ages. The method

came with the hydration increased, the initial non-evaporating the water content increased

gradually; then decreased slightly, the non-evaporating the water content has increased

gradually in the late hydration process; the early hydration rate gradually increased with

silica fume content increasing; fly ash contribute to the late cement hydration

process. Observed by scanning electron microscopy experiments that the reaction time of

fly ash in the composite paste was very long and the silica fume could quickly respond to

the cement hydration products. And pore structure of cement paste was observed by using

N2 adsorption measurement, these results could establish a relevance between the micro

porestructure and macroscopical drying shrinkage. Adding silica fume and fly ash have

greatly improved the pore size distribution. The pore size range is shrinking with filling

effect of silica fume and fly ash .In the early hydration of silica fume on pore structure of

the hydration reaction is mainly calcium silicate gel, fly ash is played in the early filling

effect, experiments show that they improve the range of 0-20nm pore size is particularly

significant.

Keywords: Silica fume, Fly ash, non-evaporative water, Composite cement paste,

Drying shrinkage, Cement paste pore structure . 大掺量矿物掺合料复合水泥浆体的化学结合水与孔结构的研究

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目录

第一章 前言 .................................................. 1

1.1硅酸盐水泥的发展历程 .................................... 1

1.2 硅灰、粉煤灰简介及作用 ................................. 2

1.2.1 硅灰 ................................................. 2

1.2.2 粉煤灰 ............................................... 3

1.3 实验研究的意义与现状 ................................... 5

1.3.1 非蒸发水的测量与研究 ................................... 5

1.3.2 孔结构的测量与研究 ..................................... 9

1.4 实验任务 .............................................. 10

第二章 实验设计及方法 ...................................... 11

2.1 实验准备 .............................................. 11

2.1.1原材料及仪器 .......................................... 11

2.1.2配比设计方案 .......................................... 12

2.1.3实验方案计算 .......................................... 13

2.1.4 实验简要流程 ......................................... 14

2.2 实验方法 .............................................. 15 安徽建筑工业学院本科生毕业设计

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2.2.1 恒温干燥箱法测量非蒸发水量 ............................. 15

2.2.2 孔结构测量 ........................................... 16

第三章 实验数据分析 ....................................... 18

3.1利用恒温箱干燥的方法测定非蒸发水含量实验数据分析 ....... 18

3.1.1 利用恒温箱干燥的方法测定不同龄期非蒸发水实验原始数据 ......... 18

3.1.2 利用恒温箱干燥的方法测定非蒸发水含量实验数据计算 ........... 21

3.1.3 实验数据结果分析 ...................................... 23

3.2水泥石的孔结构分析 ..................................... 24

3.2.1比表面积、孔径结构测定原理 .............................. 24

3.2.3 孔结构与干燥收缩之间的关系 ............................. 37

第四章 总结 ................................................. 41

参考文献 .................................................... 42

致谢 ........................................................ 44