金属玻璃增强混凝土材料力学性能研究

论文总字数：26631字

摘 要

3D打印混凝土增材制造技术日新月异，可以满足建筑的个性化和快速化需求。但是3D打印混凝土构件目前还不能广泛应用于结构承载力构件，原因主要是强度不足，耐腐蚀性不好。然而金属玻璃具有独特的力学和机械性能，强度高、韧性好和耐腐蚀性强等优点。因此我们探索了金属玻璃增强3D打印混凝土增材制造技术，通过添加金属玻璃来打印混凝土试样与构件，并开展系列实验，研究含金属玻璃组分的混凝土材料养护周期中的力学性能规律。在此基础上，通过改变添加金属玻璃的质量百分比，来研究分析铁基金属玻璃对3D打印混凝土材料三点弯抗折强度的影响。

我们开展了三点弯实验来分析铁基金属玻璃对混凝土强度的提升有无影响，主要得到以下结论：

（1）添加金属玻璃薄带的养护实验表明，随着养护天数的增加，抗折强度和弹性模量都逐渐增加，12天后趋于稳定。

（2））铁基金属玻璃的加入对混凝土材料的抗折强度有所改善，养护稳定后，最终抗折强度增加，当采用局部加入3条薄带时，增加3.43%；当分散添加金属玻璃纤维，质量分数1%时增加13.62%，2%时增加了15.08%，达到4.732MPa。

（3）我们多组三点弯实验，发现添加铁基金属玻璃增强的3D打印混凝土试样加载时，位移值明显小于常规3D打印混凝土材料，表明弹性模量有所提升。

（4）分析断裂特征，我们发现不加铁基金属玻璃的试样明显90度脆断，分散添加金属玻璃纤维的断口横截面则为80度左右断裂角，而加入薄带的试样，只是萌发裂纹，并没有断裂。

关键词：铁基金属玻璃；3D打印；抗折强度；位移；裂纹。

Abstract

3D printing concrete additive manufacturing technology changes with each passing day, which can meet the personalized and rapid needs of buildings. However, 3D printed concrete members are not widely used in structural bearing capacity members at present, mainly due to the lack of strength and corrosion resistance. However, metallic glass has unique mechanical and mechanical properties, such as high strength, good toughness and corrosion resistance. Therefore, we explored the technology of metal glass reinforced 3D printing concrete additive manufacturing, by adding metal glass to print concrete samples and components, and carried out a series of experiments to study the mechanical properties of concrete materials containing metal glass components in the curing cycle. On this basis, by changing the mass percentage of added metallic glass, the influence of iron foundation glass on the three-point bending strength of 3d-printed concrete material was studied and analyzed.

We carried out the three-point bend experiment to analyze whether the iron foundation glass has an iMPact on the improvement of concrete strength, and the following conclusions were obtained:

(1) the curing experiment of adding metal glass thin strip shows that, with the increase of curing days, the flexural strength and elastic modulus gradually increase, and tend to be stable after 12 days.

(2) the addition of iron foundation glass has improved the flexural strength of concrete materials. After maintenance and stability, the ultimate flexural strength increases. When 3 thin strips are added locally, the flexural strength increases by 3.43%. When metallic glass fiber was added in dispersion, the mass fraction increased by 13.62% at 1% and 15.08% at 2%, reaching 4.732MPa.

(3) In our multi-group three-point bending experiments, we found that the displacement value of 3d-printed concrete samples with glass reinforced iron foundation was significantly lower than that of conventional 3d-printed concrete materials, indicating that the elastic modulus was improved.

(4) by analyzing the fracture characteristics, it was found that the samples of non-ferrous glass were obviously brittle at 90 degrees, and the fracture cross-section of scattered glass fiber was about 80 degrees, while the samples with thin bands were just germinating cracks without fracture.

Key words: Iron fund belongs to glass; 3 D printing; Flexural strength; Displacement; Crack.

目 录

摘要 I

Abstract II

第一章 绪论 1

1.1 引言 1

1.2混凝土的发展简史 1

1.2.1国外混凝土发展 2

1.2.2国内混凝土发展 2

1.3金属玻璃的发展简史 3

1.3.1国内金属玻璃发展 3

1.4 金属玻璃的性质 3

1.5 3D打印增材制造技术 5

1.6 本文的主要内容 5

第二章 实验简介 8

2.1实验材料准备 8

2.1.1原材料 9

2.1.2混凝土试块制作 9

2.1.3混凝土试样 10

2.2实验器材准备 11

第三章 实验数据及现象分析 14

3.1实验原始数据 14

3.2实验数据分析 15

3.2.1基本图像 15

3.2.2初步综合分析 20

3.2.3图像综合分析 21

3.2.4铁基金属玻璃纤维试块分析 27

3.2.5抗折强度计算 30

3.3实验现象分析 33

第四章 总结与期望 38

4.1主要结论 38

4.2研究展望 38

参考文献 40

致 谢 42

剩余内容已隐藏，请支付后下载全文，论文总字数：26631字