论文总字数：19103字

摘 要

伴随着时代科技的不断进步与发展，各行各业都在快速转型升级中，水泥工业也不排除在外，在生产过程中，其也面临着原材料消耗，环境污染等不可逆转的问题。目前有关这方面的研究在不断向石灰石微粉与辅助性胶凝材料复合体系倾向。研究表明石灰石与辅助性胶凝材料复合时会产生协同作用，能显著改善水泥的力学性能。对比石灰石微粉，白云石微粉与辅助性胶凝材料的混合在水泥中能否具有相似的效应的尚且有待研究。本课题围绕白云石微粉与辅助性胶凝材料复合体系的水泥强度发展研究，以石灰石微粉作对比，分别研究了白云石微粉与粉煤灰或偏高岭土混合对水泥砂浆强度的影响。同时，利用材料测试方法对混合体系浆体的水化产物组成与微观结构进行分析，进而探究白云石微粉与不同辅助性胶凝材料在水泥中的作用机制。结果表明：

（1）石灰石微粉或白云石微粉的掺入会降低水泥的力学强度，白云石微粉体系下降更多，石灰石微粉体系更优。

（2）石灰石微粉或白云石微粉与偏高岭土复合强能提高混合体系的强度；白云石微粉或石灰石微粉与粉煤灰复合，前者降低水泥的强度，后者提高水泥的强度。偏高岭土比粉煤灰更优。石灰石微粉复合体系比白云石微粉的复合体系更好。

（3）石灰石微粉或白云石微粉与偏高岭土复合强能提高混合体系的Hc衍射峰强度；白云石或石灰石微粉与粉煤灰复合，前者降低衍射峰的强度，后者提高衍射峰的强度。偏高岭土比粉煤灰对水化产物的影响更优。就对水化产物的影响而言，石灰石微粉的复合体系比白云石微粉的复合体系更好。

（4）再加上对掺入物质得到的水化产物的分析，得出偏高岭土的活性比粉煤灰的活性更高。

关键词：石灰石微粉 白云石微粉 胶凝材料 偏高岭土 粉煤灰 性能

Development of mortar strength of composite system of dolomite powder and auxiliary cementitious material

Abstract

With the development of science and technology in the era, the transformation and upgrading of all walks of life are in progress, and the cement industry is not excluded. In the production process, it also faces the irreversible problems such as raw material consumption, environmental pollution, etc. At present, the research in this field tends to the composite system of limestone powder and various auxiliary cementitious materials. The research shows that limestone and many kinds of auxiliary cementitious materials will have synergistic effect, which can significantly improve the mechanical properties of cement. However, compared with limestone powder, whether the mixture of dolomite powder and other materials has similar effect in concrete and cement remains to be studied. This paper focuses on the research on the development of cement strength of dolomite powder and auxiliary cementitious material composite system. Taking limestone powder as a contrast, the influence of the mixture of dolomite powder and slag, fly ash, metakaolin and silica fume on the strength of cement mortar is studied. At the same time, the product composition and microstructure of the composite slurry were analyzed by using modern testing technology, and then the mechanism of dolomite powder and different auxiliary cementitious materials in cement was explored. The results show that:

(1) The addition of limestone or dolomite powder will reduce the mechanical strength of cement, dolomite powder system will decline more, limestone powder system is better.

(2) The composite strength of limestone or dolomite powder and metakaolin can improve the strength of the mixed system; the composite strength of dolomite or limestone powder and fly ash can reduce the strength of cement, and the latter can improve the strength of cement. Metakaolin is better than fly ash. The composite system of limestone powder is better than that of dolomite powder.

(3) The composite strength of limestone or dolomite powder and metakaolin can improve the intensity of HC diffraction peak of the mixed system; the composite strength of dolomite or limestone powder and fly ash can reduce the intensity of diffraction peak, while the latter can improve the intensity of diffraction peak. The effect of metakaolin is better than that of fly ash. The effect of limestone powder composite system on hydration products is better than that of dolomite powder composite system.

(4) In addition, the analysis of the hydration products obtained by adding materials shows that the activity of metakaolin is higher than that of fly ash.

Key words ： limestone：dolomite；Cementitious material；metakaolin；Fly ash；property；

目 录

摘 要 I

Abstract II

第一章 绪论 1

1.1 引言 1

1.2 石灰石微粉、白云石微粉对混凝土性能的影响 3

1.2.1石灰石微粉和白云石微粉的研究现状 3

1.2.2石灰石微粉对其工作性能的影响 3

1.2.3 石灰石微粉对其力学性能的影响 3

1.2.4 石灰石微粉对其耐久性能的影响 3

1.2.5白云石微粉对混凝土综合性能的影响 4

1.3 辅助性胶凝材料（SCMs） 4

1.4 石灰石微粉、白云石微粉和辅助胶凝材料复合对混凝土性能的影响 6

1.5 国内外研究进展 7

1.6 研究内容 8

第二章 实验部分 9

2.1 实验原料 9

2.1.1 水泥PC 9

2.1.2 石灰石微粉LS 9

2.1.3 白云石微粉DM 9

2.1.4 偏高岭土MK 9

2.1.5 粉煤灰 FA 9

2.1.6 试验用水 9

2.2 实验设备 10

2.3 实验配合比 10

2.3.1 实验配合比 10

2.3.2 砂浆的成型标准 11

2.3.3 要求 11

2.3.4 测定试件的力学强度 11

2.3.5 分析反应的水化产物 11

第三章 实验结果与数据分析 13

3.1 常温情况下的砂浆的力学强度 13

3.1.1 常温下的抗折强度 13

3.1.2 常温下的抗压强度 14

3.1.3 抗折强度与抗折强度的比较 15

3.2 水化产物的XRD分析 16

第四章 实验结论 18

4.1实验结论 18

参考文献 19

致谢 22

第一章 绪论

1.1 引言

伴随着时代科技的进步与发展，各行各业都在转型升级，水泥工业也包括其中，在生产过程中企业也面临着原材料消耗，环境污染等不可逆转的问题。稀缺的优质石灰石迫使水泥工业引入新的的替代性材料——辅助性胶凝材料。这一举措有助于促进水泥工业的低碳可持续发展。

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