论文总字数：27766字

摘 要

本实验计划以PII52.5水泥、河南大唐电厂一级灰、H225型水性环氧树脂、ZJ-PC8020聚羧酸高效减水剂、D130型消泡剂以及10W型羟丙基甲基纤维素醚为原料，按照相关国家及行业标准，对所制得的混凝土试样的力学强度、耐久度等性能进行测试，聚焦于水胶比、环氧树脂掺量、减水剂掺量、消泡剂掺量以及保水剂掺量对于水性环氧树脂改性混凝土强度及耐久性等性能的影响。设计正交实验，通过查阅相关文献及同类型实验，从微观结构上所产生的变化上对实验结果进行合理预测和分析。

结合相关文献和实验数据分析预测，水胶比的增大会使混凝土强度下降，而低水胶比会降低砂浆的流动性，维持在0.31左右的水胶比可以同时避免这两种情况，提高混凝土性能；掺加水性环氧树脂，和易性提升，过量后，破坏砂浆的均匀性，会使混凝土强度先增大后减小，综合考虑各项性能指标，其掺量在5%-10%表现最佳；减水剂可使混凝土流动性增大，但过量添加则会产生缓凝现象，掺量在1.5%-2%可保证性能改进效果；消泡剂可消除混凝土内部气泡，降低孔隙率，改善内部结构，使其宏观强度及耐久性得到提高，不同种类消泡剂的最佳掺量不同，聚醚为0.0125%-0.25%，磷酸三丁酯为0.05%，有机硅油为0.2%；保水剂可防止浆体表面水分的快速蒸发，但过量会使混凝土黏度过大，内部气泡难以排出，强度因此而下降，保水剂的最佳掺量通常是水泥量的0.5%-0.6%。

关键词：水性环氧树脂改性混凝土 力学性能 耐久性 水胶比 环氧树脂掺量 减水剂掺量 消泡剂掺量 保水剂掺量

Study on properties and microstructure of waterborne epoxy resin modified cement-based materials

Abstract

This study plans to use PII52.5 cement, Grade 1 ash of Henan Datang power plant, H225 water-borne epoxy resin, ZJ-PC8020 polycarboxylic acid high efficiency water reducer, D130 defoamer and 10W hydroxypropyl methyl cellulose ether as raw materials, in accordance with the relevant national and industry standards, testing the mechanical strength, durability and other properties of the concrete samples, focusing on the influence of water/cement ratio, the dosage of epoxy resin, the dosage of water reducer, dosage of defoamer and dosage of water retention agent for waterborne epoxy resin modified concrete’s properties, such as concrete strength and durability. Design orthogonal experiments. By searching relevant literatures and experiments of the same type, the experimental results were predicted and analyzed reasonably from the changes in microstructure.

Based on the analysis of relevant literature and experimental data, it is predicted that the increase of water-binder ratio will reduce the strength of concrete, while the low water-binder ratio will reduce the fluidity of mortar. Maintaining the water-binder ratio at about 0.31 can avoid these two situations at the same time and improve the performance of concrete.The workability is improved by adding water-based epoxy resin. Excessive mixing will destroy the uniformity of mortar and make the concrete strength increase first and then decrease. Taking all performance indexes into consideration, the mixing amount is the best at 5%-10%.Water reducer can increase the fluidity of concrete, but excessive addition will result in slow setting, and the content of 1.5-2% can guarantee the performance improvement.Defoaming agent can eliminate the internal bubbles of concrete, reduce the porosity, improve the internal structure, and improve its macro strength and durability. The optimal content of different types of defoaming agent is different. Polyether is 0.0125%-0.25%, tributyl phosphate is 0.05%, and organic silicone oil is 0.2%.The water-retaining agent can prevent the rapid evaporation of the water on the slurry surface, but the excess will make the concrete viscosity is too large, the internal bubbles are difficult to discharge, the strength therefore decreases, the optimal dosage of water-retaining agent is usually 0.5-0.6% of the cement.

Key Words: Waterborne epoxy resin modified concrete; Mechanical properties; Durability; Water/cement ratio; Content of epoxy resin; Water reducing agent content; Content of defoamer; Water retention agent content

目 录

摘 要 I

Abstract II

第一章 引言 1

1.1 发展背景 1

1.2 聚合物改性水泥基材料 2

1.2.1 分类 2

1.2.2 改性机理 4

1.3 水性环氧树脂改性水泥基材料的性能、组成及影响因素 7

1.3.1 性能 7

1.3.2 组成 8

1.3.3 影响因素 8

1.4 研究目的及内容 15

第二章 实验部分 17

2.1 实验原料 17

2.2 技术指标及评测方法 17

2.3 实验方案 18

2.4 实验步骤及测试方法 18

2.4.1 试样的成型 18

2.4.2 试样的养护 20

2.4.3 试样强度的测定 20

2.4.4 吸水率与密度的测定 21

2.4.5 试样的耐久性测定 21

2.4.6 干燥收缩 22

第三章 实验结果预测及分析 24

3.1 水胶比 24

3.2 水性环氧树脂掺量 26

3.3 减水剂掺量 28

3.4 消泡剂掺量 29

3.5 保水剂掺量 30

第四章 结论与展望 33

4.1 结论 33

4.2 展望 34

参考文献 35

第一章 引言

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