机制砂与特细砂抗氯盐侵蚀混凝土的制备及性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2121-2129.

机制砂与特细砂抗氯盐侵蚀混凝土的制备及性能研究

汪伟¹, 赖增成², 谭鹏², 鞠志成², 杨海成^1,3, 范志宏^1,3

1.中交四航工程研究院有限公司水工构造物耐久性技术交通行业重点实验室,广州 510230;
2.中国路桥工程有限责任公司,北京 100011;
3.中交集团建筑材料重点实验室,广州 510230

收稿日期:2023-10-26 修订日期:2023-12-28 出版日期:2024-06-15 发布日期:2024-06-18
作者简介:汪伟(1996—),男,工程师。主要从事混凝土结构耐久性的研究。E-mail:1121879948@qq.com

Preparation and Properties of Chloride Resistant Concrete with Manufactured Sand and Extra Fine Sand

WANG Wei¹, LAI Zengcheng², TAN Peng², JU Zhicheng², YANG Haicheng^1,3, FAN Zhihong^1,3

1. Key Laboratory of Harbor ＆ Marine Structure Durability Technology, Ministry of Transport of PRC, CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China;
2. China Road & Bridge Corporation, Beijing 100011, China;
3. Key Laboratory of Construction Material, CCCC, Guangzhou 510230, China

Received:2023-10-26 Revised:2023-12-28 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 利用机制砂、特细砂等制备抗氯盐侵蚀混凝土对降低生产成本、提升桥梁服役寿命具有重要意义。本研究通过优化骨料设计与水泥浆体组成提升混凝土的抗氯离子侵蚀性能,研究了骨料级配、特细砂用量、砂率、水胶比、胶凝材料种类对混凝土性能的影响。结果表明:8~16 mm碎石质量分数由50%增加至80%时,氯离子扩散系数由4.0×10^-12 m²/s降低至2.9×10^-12 m²/s;特细砂替代50%(质量分数)机制砂时,氯离子扩散系数为3.6×10^-12 m²/s,仍可以满足设计要求;砂率增大,氯离子扩散系数先减小后增大。水胶比在0.36~0.38时,氯离子扩散系数低于3.5×10^-12 m²/s;矿渣组分水化改善了混凝土的孔结构,并形成了更多的AFm、C-S-H产物,提升了混凝土对氯离子的固化能力,矿渣水泥混凝土氯离子扩散系数较普通硅酸盐水泥混凝土降低了40%。

关键词: 机制砂, 特细砂, 矿渣水泥, 抗氯盐侵蚀, 氯离子扩散系数, 力学性能

Abstract: Using manufactured sand, extra fine sand and other materials to prepare chloride resistance concrete is of great significance to reduce production costs and improve the service life of bridges in coastal areas. In this study, the chloride resistance of concrete was improved by optimizing aggregate design and cement paste composition. The effects of aggregate gradation, extra fine sand content, sand ratio, water-binder ratio and cementitious material type on concrete performance were studied. The results show that the chloride diffusion coefficient decreases from 4.0×10^-12 m²/s to 2.9×10^-12 m²/s when the mass fraction of 8~16 mm gravel increases from 50% to 80%. When 50% (mass fraction) manufactured sand is replaced by extra fine sand, the chloride diffusion coefficient is 3.6×10^-12 m²/s, which can still meet the design requirements. With the increase of sand ratio, the chloride diffusion coefficient decreases first and then increases. The water-binder ratio is controlled in the range of 0.36~0.38, and the chloride diffusion coefficient is less than 3.5×10^-12 m²/s. The hydration of slag component improves the pore structure of concrete, and forms more AFm and C-S-H, which improves the chloride binding capacity. The chloride diffusion coefficient of concrete with slag cement is 40% lower than that of OPC.

Key words: manufactured sand, extra fine sand, slag cement, chloride resistance, chloride diffusion coefficient, mechanical property

中图分类号:

TU528.33

汪伟, 赖增成, 谭鹏, 鞠志成, 杨海成, 范志宏. 机制砂与特细砂抗氯盐侵蚀混凝土的制备及性能研究[J]. 硅酸盐通报, 2024, 43(6): 2121-2129.

WANG Wei, LAI Zengcheng, TAN Peng, JU Zhicheng, YANG Haicheng, FAN Zhihong. Preparation and Properties of Chloride Resistant Concrete with Manufactured Sand and Extra Fine Sand[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2121-2129.

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