纳米SiO2改性纤维增强普通硅酸盐水泥-硫铝酸盐水泥复合材料早期性能及微观结构

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (3): 795-801.

纳米SiO₂改性纤维增强普通硅酸盐水泥-硫铝酸盐水泥复合材料早期性能及微观结构

王玉华¹, 孙拴虎²

1.南京铁道职业技术学院供电与工程学院,南京 210031;
2.陕西机电职业技术学院铁道工程学院,宝鸡 721001

收稿日期:2021-10-12 修回日期:2021-12-12 出版日期:2022-03-15 发布日期:2022-04-08
通讯作者: 孙拴虎,助教。E-mail:269846714@qq.com
作者简介:王玉华(1990—),女,博士,讲师。主要从事混凝土、钢结构、结构设计方向的研究。E-mail:wangyuhua901212@163.com
基金资助:
江苏省高等学校自然科学研究面上项目(19KJB560018)

Effect of Nano-SiO₂ on Early Properties and Microstructure of Fiber-Reinforced Ordinary Portland Cement-Sulphoaluminate Cement Composites

WANG Yuhua¹, SUN Shuanhu²

1. School of Power Supply and Engineering, Nanjing Institute of Railway Technology, Nanjing 210031, China;
2. School of Railway Engineering, Shaanxi Institute of Mechatronic Technolog, Baoji 721001, China

Received:2021-10-12 Revised:2021-12-12 Online:2022-03-15 Published:2022-04-08

摘要/Abstract

摘要： 为优化纤维增强普通硅酸盐水泥-硫铝酸盐水泥复合材料(OPC-CSA-ECC)的性能,拓宽纳米SiO₂的应用范围,本文系统探讨了纳米SiO₂对OPC-CSA-ECC凝结时间、强度和韧性的影响,并结合XRD和SEM分析了体系的微观结构和改性机制。结果表明:纳米SiO₂缩短了复合胶凝体系的凝结时间,且掺量越大凝结时间越短;纳米SiO₂可提高OPC-CSA-ECC的强度和韧性,纳米SiO₂的适宜掺量在1.5%(质量分数),对应的7 d和28 d龄期抗压强度分别为59.1 MPa和85.4 MPa,等效弯曲韧性分别为195.82 kJ/m³和256.51 kJ/m³。纳米SiO₂没有改变水化产物的种类,但促进了C-S-H凝胶生成且消耗了部分portlandite晶体。SiO₂通过提高基体密实度增大了基体与纤维之间的粘结性能,有助于应变硬化行为的实现。

关键词: 纳米SiO₂, 纤维增强水泥基复合材料, 力学性能, 韧性, 微观结构

Abstract: In order to optimize the properties of fiber-reinforced ordinary Portland cement-sulfoaluminate cement composites (OPC-CSA-ECC) and extend the use of nano-SiO₂, this study discussed the effects of nano-SiO₂ on the setting time, strength and toughness of OPC-CSA-ECC. Microstructure and modification mechanism of OPC-CSA-ECC were analyzed by XRD and SEM. The results show that, nano-SiO₂ shortens the setting time of the composite cementitious, and the greater the content, the shorter the setting time. Nano-SiO₂ improves the strength and toughness of OPC-CSA-ECC. The appropriate content of nano-SiO₂ is 1.5% (mass fraction), the corresponding compressive strength at 7 d and 28 d is 59.1 MPa and 85.4 MPa, and the equivalent flexural toughness is 195.82 kJ/m³ and 256.51 kJ/m³, respectively. Nano-SiO₂ doesn't change the type of hydration products, but promotes the formation of C-S-H gel and consumes some portlandite crystals. SiO₂ increases the adhesion between the matrix and fiber by increasing the density of the matrix, which contributes to improve strain hardening ability.

Key words: nano-SiO₂, engineered cementitious composite, mechanical property, toughness, microstructure

中图分类号:

TU525.9

王玉华, 孙拴虎. 纳米SiO₂改性纤维增强普通硅酸盐水泥-硫铝酸盐水泥复合材料早期性能及微观结构[J]. 硅酸盐通报, 2022, 41(3): 795-801.

WANG Yuhua, SUN Shuanhu. Effect of Nano-SiO₂ on Early Properties and Microstructure of Fiber-Reinforced Ordinary Portland Cement-Sulphoaluminate Cement Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(3): 795-801.

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纳米SiO₂改性纤维增强普通硅酸盐水泥-硫铝酸盐水泥复合材料早期性能及微观结构

Effect of Nano-SiO₂ on Early Properties and Microstructure of Fiber-Reinforced Ordinary Portland Cement-Sulphoaluminate Cement Composites

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