再生粗骨料粒径对混凝土力学和耐久性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3679-3687.

再生粗骨料粒径对混凝土力学和耐久性能的影响

陈鹏博¹, 李北星¹, 曾波²

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.北京都市绿源环保科技有限公司固废研发中心,北京 102601

收稿日期:2023-06-21 修订日期:2023-07-23 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 李北星,博士,教授。E-mail:libx0212@126.com
作者简介:陈鹏博(1997—),男,硕士研究生。主要从事固体废弃物建材资源化方面的研究。E-mail:951199734@qq.com
基金资助:
国家重点研发计划(2020YFC1909904)

Influence of Particle Size of Recycled Coarse Aggregate on Mechanical Properties and Durability of Concrete

CHEN Pengbo¹, LI Beixing¹, ZENG Bo²

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. Solid Waste R&D Center, Beijing Urban Green Source Environmental Protection Technology Co., Ltd., Beijing 102601, China

Received:2023-06-21 Revised:2023-07-23 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 为了改善粗骨料系统并进一步提高再生混凝土的性能,在不改变天然粗骨料级配的情况下制备了再生粗骨料取代率分别为64%和36%的两个系列再生混凝土,研究了混合粗骨料体系中不同粒径(5~＜10 mm、10~＜20 mm、20~31.5 mm)天然/再生粗骨料对混凝土工作性、力学性能、耐久性能的影响。结果表明,当再生粗骨料总取代率不变时,随着再生粗骨料取代粒径增大,再生混凝土的坍落度/扩展度不断增大,抗压强度、抗折强度与弹性模量基本呈增大趋势,电通量和碳化深度逐步降低。在再生粗骨料取代率较高条件下,提高20~31.5 mm再生粗骨料的比例,更有利于改善再生混凝土的力学性能与耐久性能。

关键词: 再生粗骨料, 混凝土, 粒径, 力学性能, 耐久性能

Abstract: In order to improve coarse aggregate system and further improve the performance of recycled concrete, two series of recycled concrete were prepared with 64% and 36% replacement ratio of recycled coarse aggregate without changing natural coarse aggregate gradation. The effects of natural/recycled coarse aggregates with different particle sizes ([5,10) mm, [10,20) mm, [20,31.5] mm) on workability, mechanical properties and durability of concrete in mixed coarse aggregate system were investigated. The results show that when the total replacement rate of recycled coarse aggregate is constant, with the increase of recycled coarse aggregate size, the slump/slump flow of recycled concrete increases continuously, the compressive strength, flexural strength and elastic modulus basically increase, and the electric flux and carbonation depth gradually decrease. Under the condition of high replacement ratio of recycled coarse aggregate, increasing the proportion of 20 mm to 31.5 mm recycled coarse aggregate is more conducive to improving the mechanical properties and durability of recycled concrete.

Key words: recycled coarse aggregate, concrete, particle size, mechanical property, durability

中图分类号:

TU528

陈鹏博, 李北星, 曾波. 再生粗骨料粒径对混凝土力学和耐久性能的影响[J]. 硅酸盐通报, 2023, 42(10): 3679-3687.

CHEN Pengbo, LI Beixing, ZENG Bo. Influence of Particle Size of Recycled Coarse Aggregate on Mechanical Properties and Durability of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3679-3687.

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