论文总字数：21735字

摘 要

高铁低钙水泥作为一种铁相含量≥18%，硅酸三钙含量≤50%的特种水泥。耐冲磨性能和抗硫酸盐侵蚀能力，抗氯离子侵蚀能力特点，同样由于其铁相含量多，其烧成温度低，有利于节省燃料。外加高铁低钙水泥与普通硅酸盐水泥相比硅酸三钙的含量较少，其水化热也就相对较小，适合用于大体积混凝土。但是由于硅酸二钙的含量较普通硅酸盐水泥的含量更多，所以高铁低钙水泥具有早期强度低而后期强度高的特点。海洋环境复杂多样，人们对于海洋的开发利用急不可待。而高铁低钙水泥作为一种适用于海洋混凝土的水泥，自然将发挥很大的作用。本研究主要利用普通硅酸盐水泥与高铁低钙水泥进行性能的比较研究，比如说水化过程，水化机理，抗压抗折强度等。通过本研究发现高铁低钙水泥的早期强度不高而且低于普通硅酸盐水泥的早期强度，然而高铁低钙水泥的后期强度能够迅速增长并且超过普通硅酸盐水泥的后期强度。利用SEM、BSE、NMR等多种表征研究方法，我们对高铁低钙水泥和普通硅酸盐水泥配置的水泥砂浆的水泥石与骨料之间的界面过渡区和C～S～H凝胶平均链长进行研究分析，发现高铁低钙水泥砂浆水泥石与骨料之间的界面过渡区的厚度氢氧化钙含量都小于普通硅酸盐水泥，正是由此，界面过渡区的粘结情况得到改善，水泥强度得到增加。根据NMR得到的分析结果计算发现，高铁低钙水泥水化产生的C～S～H凝胶的平均链长大于普通硅酸盐水泥水化产生的C～S～H凝胶的平均链长，这也说明了高铁低钙水泥力学性能优于普通硅酸盐水泥。通过水化热实验分析，发现高铁低钙水泥与普通硅酸盐相比，其水化热低而且放热总量也低。再对高铁低钙水泥和普通硅酸盐水泥做水化程度分析，发现普通硅酸盐3d、7d、28d水化程度大于高铁低钙水泥的相同龄期的水化程度，这与水泥的矿物组成有直接的关系。

关键词：高铁低钙水泥；普通硅酸盐水泥；力学性能；水化热

Abstract

High iron low calcium cement is a kind of specail cement with iron content ≥18% and C₃S content ≤5%.Impact and wear resistance and other properties such as resistance to sulfate erosion ability, resistance to chloride ion erosion ability characteristics, due to the same iron content, its burning temperature is low, is conducive to fuel saving. Plus high iron low calcium cement and ordinary Portland cement than the content of calcium silicte is less, its heat of hydration is relatively small, suitble for mass concrete. However, because the content of C₂S is more than that of ordinary Portland cement, the high iron low calcium cement has the characteristics of low strength in the early stage and high strength in the later stage. The Marine environment is complex and diverse, and people can't wait for the exploittionand utilition of the ocean.As kind of cement suitable for Marine concrete, the high iron low calcium cement will naturlly play great role. This research mainly uses the ordinary Portlnd cement and the high iron low calcium cement to carry on the performnce comparison research, for exmaple the hydration process, the hydration mechanism, the Compressive and Flexible strength and so on. Through this study, it is found that the early strength of high iron and low calcium cement is not high and lower than that of ordinary Portland cement, while the late strength of high iron and low calcium cement can increase rapidly and exceed the late strength of ordinary Portland cement. Using SEM, BSE, NMR etc. Various characterization methods, we with high iron and low calcium cement and ordinary Portland cement configuration of cement mortar of interface transition zone between cement and aggregate and C ~ S ~ H gel through analyzing the average chain length, found that high iron and low calcium cement mortar interface transition zone between cement and aggregate thickness is less than ordinary Portland cement, calcium hydroxide content is thus, interfacial transition zone bonding situation improves, increase cement strength. NMR analysis results show that the average chain length of C ~ S ~ H gel produced by hydration of high iron and low calcium cement is longer than that of the average chain length of C ~ S ~ H gel produced by hydration of ordinary Portland cement, which also indicates that the mechanical properties of high iron and low calcium cement are better than that of ordinary Portland cement. Through the analysis of hydration heat experiment, it is found that compared with ordinary silicate, the hydration heat of high iron and low calcium cement is low and the total amount of heat release is low. Then the hydration degree of high iron low calcium cement and ordinary Portland cement is analyzed, and it is found that the hydration degree of ordinary Portland cement in 3d, 7d and 28d is greater than the hydration degree of the same age of high iron low calcium cement, which is directly related to the mineral composition of cement.

Key words:High iron low calcium cement; Ordinary Portland cement; Mechanical properties; The hydration heat

目录

Abstract IV

第一章 绪论 1

1.1高铁低钙水泥的定义 1

1.2 普通硅酸盐水泥的水化过程 1

1.3水泥石与骨料界面过渡区和C-S-H凝胶 2

1.4高铁低钙水泥的国内外研究进展 3

第二章 原材料与研究方法 5

2.1实验原材料 5

2.2实验方法 6

2.2.2 力学性能测试 7

2.2.3 水化热测试 7

2.2.4 扫描电镜（SEM） 7

2.2.5 核磁共振（NMR） 8

2.2.6 背散射分析（BSE） 8

2.2.7 蒸养制度 9

第三章 实验结果讨论 10

3.1 水泥水化热分析 10

3.2 水泥力学性能分析 11

3.2.1 标准养护温度下的水泥力学分析 11

3.2.2 在静养和蒸养条件下的水泥力学性能 12

3.3 SEM图像和BSE图像 14

3.4 核磁共振（NMR）图像 16

第四章 结论与展望 18

4.1 实验结论 18

4.2 展望 18

参考文献 20

致谢 22

第一章 绪论

1.1高铁低钙水泥的定义

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