低气压养护对水泥净浆性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3439-3444.

低气压养护对水泥净浆性能的影响

张志杰^1,2, 代金鹏^1,3,4, 杨小媛², 何杰², 王起才¹

1.兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州 730070;
2.兰州交通大学土木工程学院,兰州 730070;
3.江苏省建筑科学研究院有限公司,高性能土木工程材料国家重点实验室,南京 210008;
4.东南大学材料科学与工程学院,南京 211189

收稿日期:2023-05-22 修订日期:2023-06-27 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 代金鹏,博士,副研究员。E-mail:daijp@mail.lzjtu.cn
作者简介:张志杰(1998—),男,硕士研究生。主要从事混凝土材料性能方面的研究。E-mail:q2975788846@163.com
基金资助:
国家自然科学基金(51768033,51808272);甘肃省青年科技基金(21JR7RA330);甘肃省青年科技人才托举工程项目(GXH20210611-10);兰州交通大学“天佑青年托举人才计划”基金;长江学者和创新团队发展计划滚动资助项目(IRT_15R29);甘肃省引导科技创新发展专项-重点研发能力提升项目(2019ZX-09)

Effect of Low Air Pressure Curing on Performance of Cement Paste

ZHANG Zhijie^1,2, DAI Jinpeng^1,3,4, YANG Xiaoyuan², HE Jie², WANG Qicai¹

1. National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. Civil Engineering Department, Lanzhou Jiaotong University, Lanzhou 730070, China;
3. State Key Laboratory of High Preformance in Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Ltd., Nanjing 210008, China;
4. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Received:2023-05-22 Revised:2023-06-27 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 高原气候环境下基础设施结构混凝土材料强度、耐久性所面临的问题逐渐凸显,研究高原气候环境对混凝土性能的影响具有重要意义。通过低气压试验箱模拟95.0、70.7、57.6、47.0和38.7 kPa气压环境,测试了不同养护气压下水泥净浆的抗压强度、孔结构和物相组成。结果表明,在同一龄期时,随着养护气压的降低,水泥净浆的抗压强度逐渐降低,孔隙率逐渐增加,最可几孔径逐渐增大,过渡孔比例减小,毛细孔和大孔的比例增加,水化产物中的Ca(OH)₂逐渐减少。此外,本文还分析了水泥净浆抗压强度与孔结构的关系,基于水泥净浆孔结构参数,建立了水泥净浆抗压强度预测模型。

关键词: 低气压, 水泥净浆, 抗压强度, 孔隙率, 孔径分布, 物相组成

Abstract: The problems of strength and durability of concrete materials for infrastructure structures in plateau climate are becoming more and more prominent. It is of great significance to study the influence of plateau climate environment on concrete properties. The low pressure test chamber was used to simulate the air pressure environment of 95.0, 70.7, 57.6, 47.0 and 38.7 kPa, and the performance indicators such as compressive strength, pore structure and phase composition of cement paste under different curing air pressures were tested. The results show that at the same age, with the decrease of curing air pressure, the compressive strength of cement paste decreases and the porosity increases, the most probable pore diameter of the sample increases, the proportion of transition pore decreases, the proportion of capillary pore and macropore increases, and the Ca(OH)₂ in the hydration products of cement paste decreases. In addition, the correlation between the compressive strength of cement paste and pore structure was analyzed, based on the pore structure parameters of cement paste, and the prediction model of compressive strength of cement paste was established.

Key words: low air pressure, cement paste, compressive strength, porosity, pore size distribution, phase composition

中图分类号:

TU528

张志杰, 代金鹏, 杨小媛, 何杰, 王起才. 低气压养护对水泥净浆性能的影响[J]. 硅酸盐通报, 2023, 42(10): 3439-3444.

ZHANG Zhijie, DAI Jinpeng, YANG Xiaoyuan, HE Jie, WANG Qicai. Effect of Low Air Pressure Curing on Performance of Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3439-3444.

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