磁化水对海工混凝土力学性能和耐久性能的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2039-2046.

磁化水对海工混凝土力学性能和耐久性能的影响

郑彪^1,2, 李顺凯^1,2, 李育林³, 粟友良^1,2, 林奕安^1,2

1.桂林理工大学土木工程学院,桂林 541004;
2.桂林理工大学广西绿色建材与建筑工业化重点实验室,桂林 541004;
3.广西路建工程集团有限公司,南宁 530001

收稿日期:2023-11-18 修订日期:2023-12-26 出版日期:2024-06-15 发布日期:2024-06-18
通信作者: 李顺凯,博士,教授级高级工程师。E-mail:331052860@qq.com
作者简介:郑彪(1998—),男,硕士研究生。主要从事高性能混凝土制备及耐久性能的研究。E-mail:385640606@qq.com
基金资助:
广西重点研发计划(2021AB22176)

Effect of Magnetized Water on Mechanical Properties and Durability of Marine Concrete

ZHENG Biao^1,2, LI Shunkai^1,2, LI Yulin³, SU Youliang^1,2, LIN Yian^1,2

1. School of Civil Engineering, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin 541004, China;
3. Guangxi Road Construction Engineering Group Co., Ltd., Nanning 530001, China

Received:2023-11-18 Revised:2023-12-26 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 针对实际工程中大掺量矿物掺合料的海工混凝土过早面对恶劣海洋环境而易受到氯盐侵蚀的问题,本文提出使用磁化水代替自来水制备海工混凝土,研究磁化水对海工混凝土不同龄期力学性能和耐久性能的影响规律,并采用压汞仪和扫描电子显微镜对海工混凝土微观结构进行分析。研究表明:磁化水能改善海工混凝土的工作性;与自来水相比,磁化水对海工混凝土的早期力学性能有明显的提升作用,其中养护龄期为7 d的C50海工混凝土抗压强度和劈裂抗拉强度分别提高了17.9%和16.5%;在不同养护龄期下,磁化水海工混凝土的抗碳化性能和抗氯离子渗透性能均优于自来水海工混凝土;磁化水海工混凝土中胶凝材料反应程度高,裂缝较少,胶凝材料与骨料之间的连接更为紧密,孔隙结构呈现出孔隙率较低、无害孔多和有害孔少的现象,使得磁化水海工混凝土结构更为致密,从而提高海工混凝土的力学性能和耐久性能。

关键词: 磁化水, 海工混凝土, 力学性能, 耐久性能, 孔结构, 微观形貌

Abstract: In order to deal with the problem that the marine concrete with large dosage of mineral admixture in the actual project faces the harsh marine environment prematurely and is easy to be eroded by chlorine salt, this paper proposed to use magnetized water instead of tap water to prepare marine concrete, studied the influence law of magnetized water on the mechanical properties and durability of marine concrete at different ages, and analyzed the microstructure of marine concrete using the mercury instrusion porosimetry and scanning electron microscope. The study shows that magnetized water improves the workability of marine concrete. Compared with tap water, magnetized water has obvious improvement on the early mechanical properties of marine concrete, in which the compressive strength and splitting tensile strength of C50 marine concrete with a curing age of 7 d increase by 17.9% and 16.5%, respectively. Regardless of different curing ages, the resistance to carbonation and chloride ion penetration of magnetized water marine concrete are better than tap water marine concrete. The degree of reaction of cementitious materials in magnetized water marine concrete is higher, with fewer cracks, and the microstructure between cementitious materials and aggregates is more compact. The overall porosity is lower, with more harmless pores and fewer harmful pores, leading to a denser microstructure. Thus the mechanical properties and durability of marine concrete are improved.

Key words: magnetized water, marine concrete, mechanical property, durability, pore structure, microstructure

中图分类号:

TU528

郑彪, 李顺凯, 李育林, 粟友良, 林奕安. 磁化水对海工混凝土力学性能和耐久性能的影响[J]. 硅酸盐通报, 2024, 43(6): 2039-2046.

ZHENG Biao, LI Shunkai, LI Yulin, SU Youliang, LIN Yian. Effect of Magnetized Water on Mechanical Properties and Durability of Marine Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2039-2046.

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