纳米SiO2和丁苯胶粉复合改性水泥基材料的强度及抗渗性能

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (12): 4154-4162.

所属专题：水泥混凝土

纳米SiO₂和丁苯胶粉复合改性水泥基材料的强度及抗渗性能

王智鑫¹, 梅军鹏^1,2, 李海南³, 董崇¹, 张洁林¹, 周兰兰¹, 牛寅龙⁴

1.武汉科技大学城市建设学院,武汉 430065;
2.武汉科技大学高性能工程结构研究院,武汉 430065;
3.武汉纺织大学工程造价系,武汉 430200;
4.中建三局第一建设工程有限责任公司,武汉 430040

收稿日期:2022-07-11 修订日期:2022-09-14 出版日期:2022-12-15 发布日期:2023-01-11
通信作者: 梅军鹏,博士,副教授。E-mail:meijunpeng2006@126.com
作者简介:王智鑫(1995—),男,硕士研究生。主要从事高性能土木工程材料的研究。E-mail:1281054652@qq.com
基金资助:
国家自然科学基金(51908434);湖北省教育厅科学技术研究计划(Q20191706);硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2022-20)

Strength and Impermeability of Cement-Based Materials with Nano SiO₂ and Styrene-Butadiene Rubber Powder Composite Modification

WANG Zhixin¹, MEI Junpeng^1,2, LI Hainan³, DONG Chong¹, ZHANG Jielin¹, ZHOU Lanlan¹, NIU Yinlong⁴

1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2. Institute of High Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China;
3. Department of Construction Cost, Wuhan Textile University, Wuhan 430200, China;
4. China Construction Third Bureau First Engineering Co., Ltd., Wuhan 430040, China

Received:2022-07-11 Revised:2022-09-14 Online:2022-12-15 Published:2023-01-11

摘要/Abstract

摘要： 本文研究了单掺丁苯胶粉(SBR)和复掺SBR/纳米SiO₂(NS)对水泥基材料抗折强度、抗压强度、吸水率、抗氯离子渗透系数的影响规律,并采用XRD、DSC-TG、FTIR、SEM-EDS、MIP等手段对水泥基材料水化产物和微观结构进行分析,探究单掺SBR和复掺SBR/NS对水泥基材料强度及抗渗性能的影响机理。结果表明,复掺SBR/NS显著改善了由单掺SBR引起的水泥基材料早期强度下降的问题,单掺SBR和复掺SBR/NS均可降低试样的吸水率、吸水速率和非稳态氯离子迁移系数,且复掺效果优于单掺。微观测试表明:单掺SBR可降低Ca(OH)₂的含量,减少有害孔和多害孔的数量,增加结构整体性;复掺SBR/NS可进一步降低Ca(OH)₂的含量,促进水化反应生成更多C-S-H,提高C-S-H的聚合度,降低最可几孔径,减少少害孔、有害孔和多害孔的数量,降低水化产物的钙硅比,从而增强试样的抗折强度和抗压强度并提高其抗渗性能。

关键词: 丁苯胶粉, 纳米SiO₂, 强度, 吸水率, 快速氯离子迁移系数法, 孔结构

Abstract: In this paper, the flexural strength, compressive strength, water absorption and unsteady chloride ion migration coefficient were used to investigate the effect of styrene-butadiene rubber powder (SBR)/nano SiO₂ (NS) on strength and impermeability of cement-based materials. The hydration products and microstructure of cement-based materials were analyzed by XRD, DSC-TG, FTIR, SEM-EDS and MIP. Results show that complex SBR/NS significantly improves the early strength degradation of cement-based materials caused by single SBR. Both single SBR and complex SBR/NS reduce the water absorption, water absorption rate and unsteady chloride ion migration coefficient, and the effect of complex SBR/NS is better than that of single SBR. The microscopic test shows that the single SBR reduces the content of Ca(OH)₂ and the number of harmful pores and more-harmful pores and increases the integrity of the structure. The complex SBR/NS further reduces the content of Ca(OH)₂, promotes the hydration reaction to generate more C-S-H, improves the polymerization degree of C-S-H, decreases the most probable aperture, reduces the amount of less-harmful pores, harmful pores and more-harmful pores, lowers the Ca/Si ratio of hydration products, and thus enhances the flexural strength, and compressive strength and improves the impermeability of the sample.

Key words: styrene-butadiene rubber powder, nano SiO₂, strength, water absorption, RCM, pore structure

中图分类号:

TU528

王智鑫, 梅军鹏, 李海南, 董崇, 张洁林, 周兰兰, 牛寅龙. 纳米SiO₂和丁苯胶粉复合改性水泥基材料的强度及抗渗性能[J]. 硅酸盐通报, 2022, 41(12): 4154-4162.

WANG Zhixin, MEI Junpeng, LI Hainan, DONG Chong, ZHANG Jielin, ZHOU Lanlan, NIU Yinlong. Strength and Impermeability of Cement-Based Materials with Nano SiO₂ and Styrene-Butadiene Rubber Powder Composite Modification[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4154-4162.

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纳米SiO₂和丁苯胶粉复合改性水泥基材料的强度及抗渗性能

Strength and Impermeability of Cement-Based Materials with Nano SiO₂ and Styrene-Butadiene Rubber Powder Composite Modification

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