养护工艺对无砂大孔再生混凝土性能影响研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (11): 4019-4026.

养护工艺对无砂大孔再生混凝土性能影响研究

徐晨洋¹, 张志柱¹, 张鹏飞¹, 李秋义^1,2, 孔哲³, 郭远新¹, 陈明旭¹

1.青岛农业大学建筑工程学院,青岛 266109;
2.青岛理工大学土木工程学院,青岛 266033;
3.青岛城市学院土木工程学院,青岛 266106

收稿日期:2024-03-20 修订日期:2024-07-10 出版日期:2024-11-15 发布日期:2024-11-21
通信作者: 李秋义,博士,教授。E-mail:201801001@qau.edu.cn
作者简介:徐晨洋(1999—),男,硕士研究生。主要从事绿色建筑材料的研究。E-mail:20222204026@stu.qau.edu.cn
基金资助:
国家自然科学基金项目(52078261);山东省重点研发计划课题(2021SFGC0201-04);山东省自然科学基金面上项目(ZR2021ME110,ZR2022QE094);青岛市自然科学基金青年项目(23-2-1-105-zyyd-jch);青岛市标准化资助奖励项目(2422243);山东省地市级校企合作项目(2423272,2421073)

Effect of Curing Process on Properties of Sand-Free Macroporous Recycled Concrete

XU Chenyang¹, ZHANG Zhizhu¹, ZHANG Pengfei¹, LI Qiuyi^1,2, KONG Zhe³, GUO Yuanxin¹, CHEN Mingxu¹

1. School of Architecture Engineering, Qingdao Agricultural University, Qingdao 266109, China;
2. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;
3. School of Civil Engineering, Qingdao City University, Qingdao 266106, China

Received:2024-03-20 Revised:2024-07-10 Published:2024-11-15 Online:2024-11-21

摘要/Abstract

摘要： 为解决天然骨料资源浪费与再生骨料应用领域受限的问题,本文利用天然骨料与再生骨料制备无砂大孔再生混凝土,并通过力学性能、显微硬度、扫描电子显微镜和X射线衍射分析等试验对干燥、喷水和覆膜状态下的无砂大孔再生混凝土宏观与微观性能进行探究。结果表明,不同养护工艺影响了普通硅酸盐水泥的水化反应过程,无砂大孔再生混凝土的“蜂窝”结构和再生骨料特性使水化过程更加复杂。覆膜状态下的养护效果最优,其次为干燥养护,而喷水养护效果最差。在显微硬度和扫描电子显微镜测试中发现,喷水养护状态下,混凝土基体内部自由水吸收增加,导致混凝土膨胀,从而降低了骨料与水泥基质界面的黏结性和硬度值。另外,在X射线衍射分析结果中氢氧化钙等水化产物的组成也进一步证实了三种养护工艺对无砂大孔再生混凝土的影响。

关键词: 大孔再生混凝土, 养护工艺, 抗压强度, 线性拟合, 显微硬度, 微观结构

Abstract: To address the waste of natural aggregates and limited application of recycled aggregates, this study prepared sand-free macroporous recycled concrete using natural and recycled aggregates. Macro and micro properties of dry, water spraying, and coating sand-free macroporous recycled concrete were investigated via mechanical properties, microhardness, scanning electron microscopy, and X-ray diffraction analysis. The results show that different curing processes affect the hydration reaction of ordinary Portland cement, and sand-free macroporous recycled concrete “honeycomb” structure and recycled aggregate characteristics complicate the hydration process. The best curing method is coating, followed by dry, while water spraying is least effective. Microhardness and scanning electron microscopy tests reveal that the free water absorption in matrix increases during water spraying, resulting in concrete expansion, deteriorating adhesion of aggregate-cement interface and decreasing hardness. X-ray diffraction analysis results confirm the effects of curing methods on sand-free macroporous recycled concrete via composition of hydration products like portlandite.

Key words: macroporous recycled concrete, curing process, compressive strength, linear fitting, microhardness, microstructure

中图分类号:

TU528

徐晨洋, 张志柱, 张鹏飞, 李秋义, 孔哲, 郭远新, 陈明旭. 养护工艺对无砂大孔再生混凝土性能影响研究[J]. 硅酸盐通报, 2024, 43(11): 4019-4026.

XU Chenyang, ZHANG Zhizhu, ZHANG Pengfei, LI Qiuyi, KONG Zhe, GUO Yuanxin, CHEN Mingxu. Effect of Curing Process on Properties of Sand-Free Macroporous Recycled Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4019-4026.

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