纤维增强混凝土性能试验研究

论文总字数：24982字

摘 要

纤维混凝土是一直以来研究热门的一个课题，玄武岩纤维（BF）由于本身良好的性能，在混凝土中适应性较好，是近年来研究较多的一个方向，它的最佳掺量比为多少时可以使混凝土性能达到最优，同时矿物掺合料对其能否产生有效的影响。不过纤维的掺入会因为纤维的耐碱性问题而使用低碱水泥，从而增加了成本，本次实验研究了BF和表面经过处理的耐碱玄武岩纤维（NBF）的最佳掺量，主要从力学性能抗压，劈拉和抗折来对比找出其最优掺量，然后在最佳产量观察其对抗Cl^-渗透的能力与干燥收缩的情况。矿物掺合料的加入对性能会产生一些影响，混凝土发展是遵循可持续发展，加入工业残料，不仅可以保护环境、节约成本也对混凝土的某些性能产生有益的影响。选取粉煤灰代替10%的水泥进行实验的比对，了解粉煤灰的加入对NBF混凝土的影响。

通过力学实验看出掺入NBF比BF提升性能较大，NBF的最佳掺量为0.1%，然后对该掺量进行耐久性实验，结果说明NBF掺量0.1%时混凝土的抗Cl^-渗透能力和干燥收缩都有明显改善。同时，掺入10%的粉煤灰对混凝土的各方面性能也有一定提升。通过实验数据对比，了解NBF最佳掺量并对其耐久性能进行研究。结果表明，NBF掺量为0.1%时，性能提升较为明显，在建筑行业可以应用NBF粉煤灰混凝土。

关键词：玄武岩纤维、混凝土、耐碱

Abstract

Fiber reinforced concrete is a hot topic that has been studied for a long time. Basalt fiber (BF) has a good adaptability in concrete due to its good performance. It is one of the most studied in recent years. Can make the concrete performance to the best, while the mineral admixture of its ability to have an effective impact. However, the incorporation of fiber will be due to the problem of alkali resistance of fiber and the use of low-alkali cement, thereby increasing the cost of this experiment studied the BF and surface treatment of alkali-resistant basalt fiber (NBF) the best content, mainly from Mechanical properties of compression, splitting and bending to compare the optimal content, and then in the best yield observed its ability to fight Cl-penetration and drying shrinkage. The addition of mineral admixtures will have some impact on performance, and concrete development is sustainable development, adding industrial residues, not only to protect the environment, but also to save the cost of concrete also have some beneficial effects. At this point the experiment, select the fly ash instead of 10% of the cement for the experimental comparison, to understand the addition of fly ash on the impact of NBF concrete.

The results show that the NBF content is 0.1%, and the durability of the NBF is 0.1%. The results show that the anti-Cl-permeation ability of the concrete when the content of NBF is 0.1% And dry shrinkage have improved significantly. At the same time, the incorporation of 10% of the fly ash on the performance of concrete in all aspects of a certain increase. Through the comparison of experimental data, we can understand the optimum content of NBF and study its durability. The results show that NBF content is 0.1%, the performance improvement is more obvious, in the construction industry can be applied NBF fly ash concrete.

Key Words:Basalt fiber, Concrete, Alkali resistance

目 录

摘 要 I

Abstract II

目 录 III

第一章 绪论 1

1.1引言 1

1.2纤维混凝土的发展 1

1.3玄武岩纤维混凝土的发展 2

1.4耐碱玄武岩的研究 3

1.5耐碱玄武岩纤维粉煤灰混凝土的研究 4

1.6课题研究的目的和内容 5

第二章 原材料与试验方法 7

2.1概述 7

2.2试验原材料性能测试 7

2.2.1水泥 7

2.2.2粉煤灰 7

2.2.3粗骨料 8

2.2.4玄武岩纤维 8

2.2.5拌合用水 8

2.3试验方法 8

2.3.1力学性能测试 8

2.3.2耐久性能测试 8

2.3.3微观分析测试 8

第三章 玄武岩纤维混凝土的性能测试 9

3.1引言 9

3.2 纤维耐碱性能的对比 9

3.3纤维混凝土抗压强度 11

3.4劈拉强度的测试 14

3.5抗折性能数据与结果 16

3.6玄武岩纤维混凝土数据对比 18

3.7 微观形貌分析 20

3.8本章小结 21

第四章 纤维混凝土的耐久性研究 23

4.1概述 23

4.2纤维混凝土的抗Cl^-渗透研究 23

4.2.1实验步骤 23

4.2.2数据分析 23

4.3玄武岩纤维混凝土对收缩的影响 24

4.4本章小结 25

第五章 结论与展望 27

5.1结论 27

5.2展望 27

参考文献 28

致 谢 29

第一章 绪论

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