玄武岩纤维-木纤维复合碱式硫酸镁水泥性能的改性机理

宋谦益; 游俊杰; 杨成; 刘宜丰

doi:10.11835/j.issn.2096-6717.2022.109

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玄武岩纤维-木纤维复合碱式硫酸镁水泥性能的改性机理

土木工程 | 更新时间：2023-09-19

- 玄武岩纤维-木纤维复合碱式硫酸镁水泥性能的改性机理
- Modification mechanism of basalt and wood fiber composite basic magnesium sulfate cement performance
- 土木与环境工程学报 2023年45卷第5期页码：202-211
- 作者机构：
  
  1.中国建筑西南设计研究院有限公司，成都 610041
  2.西南交通大学，地球科学与环境工程学院，成都 610031
  3.西南交通大学，土木工程学院，成都 610031
  4.西南交通大学，陆地交通地质灾害防治技术国家工程研究中心，成都 610031
  5.佛山市岩琉智慧城市科技发展有限公司，广东佛山 528051
- 作者简介：
  
  宋谦益（1985- ），男，博士，高级工程师，主要从事碱式硫酸镁水泥研究，E-mail：soujy.qy@gmail.com。
  杨成（通信作者），男，博士，副教授，E-mail：yangcheng@swjtu.edu.cn。
- 基金信息：
  
  国家重点研发计划(2020YFD1100703;2021YFB2600501;2019YFD1101005);国家自然科学基金(51778537);四川省自然科学基金(2022NSFSC0458;2021YYJC0946;2020YFS0061)
- DOI：10.11835/j.issn.2096-6717.2022.109
  中图分类号： TU528.58
- 收稿：2022-07-28，
  
  纸质出版：2023-10-25
- 稿件说明：
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宋谦益, 游俊杰, 杨成, 等. 玄武岩纤维-木纤维复合碱式硫酸镁水泥性能的改性机理[J]. 土木与环境工程学报, 2023,45(5):202-211.

SONG Qianyi, YOU Junjie, YANG Cheng, et al. Modification mechanism of basalt and wood fiber composite basic magnesium sulfate cement performance[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 202-211.
宋谦益, 游俊杰, 杨成, 等. 玄武岩纤维-木纤维复合碱式硫酸镁水泥性能的改性机理[J]. 土木与环境工程学报, 2023,45(5):202-211. DOI： 10.11835/j.issn.2096-6717.2022.109.

SONG Qianyi, YOU Junjie, YANG Cheng, et al. Modification mechanism of basalt and wood fiber composite basic magnesium sulfate cement performance[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 202-211. DOI： 10.11835/j.issn.2096-6717.2022.109.

摘要

以碱式硫酸镁水泥（BMSC）为基质，以生物基循环木纤维（RWF）为轻质填料，并掺入玄武岩纤维（BF）为增强改性材料，开发出一种轻质高强、高韧性的碱式硫酸镁复合材料。从RWF填料和不同体积占比、不同长度的BF纤维出发，讨论其对改性后BMSC复合材料的流动性、分散系数（纤维）、密度、抗压强度和抗折强度的影响；通过SEM、EDS、XRD微观表征分析对复合材料微观结构的形成进行研究。结果表明：RWF的加入虽然显著降低了BMSC的材料密度，但RWF与BF结合形成复合纤维体系能明显提升BMSC复合材料的力学性能，尤其是抗折强度，较未添加RWF和BF的原生BMSC材料提升比例最高达80%以上；通过微观表征分析发现，RWF在BMSC中拥有良好的界面黏结性能，RWF与BF的共同存在使BMSC材料形成镁水泥基质-循环木纤维-玄武岩纤维体系，提升了复合材料的强度；采用基于图像识别技术的半定量化方法对碱式硫酸镁水泥5·1·7相晶体的发展程度进行辅助量化分析，为材料制备过程中BMSC产品性能的控制提供可能。

Abstract

Limited by the differences between cementitious materials and basic magnesium sulfate cement (BMSC)

the study of enhancing the toughness and mechanical properties of BMSC products by incorporating bio-based fillers with fibers is still very limited. Through different mix design

wood fiber and basalt fiber (BF) were used as lightweight fillers and reinforcements of BMSC materials. The fluidity

dispersity (fiber)

density

compressive strength and flexural strength of modified BMSC were tested. The typical samples were characterized by SEM

EDS and XRD. The results showed that the addition of wood fiber significantly reduces the density of BMSC

and the combination of wood fiber and BF can significantly improve the mechanical strength

especially the flexural strength

with the maximum increase rate of more than 80%. By microscopic characterization

it was found that wood fiber has good mixed compatibility with plant materials in BMSC. The combination of wood fiber and BF forms a magnesium cement matrix-wood fiber-BF model

which significantly improves the strength of the composite reinforcement. A semi-quantitative method based on image recognition technology was attempted

and it was found that the development degree of hydration products crystals could be analyzed quantitatively. It provides the possibility to control the performance of BMSC products during material preparation.

关键词

Keywords

references

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