氯盐冻融耦合作用下再生混凝土损伤劣化规律

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (2): 473-479.

所属专题：水泥混凝土

氯盐冻融耦合作用下再生混凝土损伤劣化规律

解国梁¹, 申向东², 刘金云¹, 张斌¹

1.黑龙江八一农垦大学土木水利学院,大庆 163319;
2.内蒙古农业大学水利与土木建筑工程学院,呼和浩特 010018

收稿日期:2020-09-18 修回日期:2020-12-06 出版日期:2021-02-15 发布日期:2021-03-10
作者简介:解国梁(1976—),男,副教授。主要从事混凝土耐久性和水工新材料方面的研究。E-mail:xieguoliang1219@163.com
基金资助:
国家自然科学基金(51769025);住房和城乡建设部研究开发项目(2020-K-162);黑龙江省农垦总局重点科研计划(HKKYZD190602)

Deterioration Law of Recycled Concrete under the Coupling of Chloride and Freeze-Thaw

XIE Guoliang¹, SHEN Xiangdong², LIU Jinyun¹, ZHANG Bin¹

1. College of Civil Engineering and Water Conservancy, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
2. College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University Inner Mongolia Agricultural University, Hohhot 010018, China

Received:2020-09-18 Revised:2020-12-06 Online:2021-02-15 Published:2021-03-10

摘要/Abstract

摘要： 为了研究严寒盐渍环境中再生混凝土的损伤劣化规律,制备了再生粗骨料质量替代率为0%、50%、100%的再生混凝土进行氯盐冻融耦合作用下的试验研究,从外观形貌、质量损失率、相对动弹性模量和抗压强度等方面探讨混凝土损伤劣化规律。结果表明,氯盐冻融对再生骨料混凝土的破坏随再生骨料替代率的增加而增大。与冻融循环0次相比,冻融循环200次时100%替代率再生混凝土的质量损失率、相对动弹性模量、相对抗压强度分别下降为6.8%、54.2%、50.5%。建立了以抗压强度损失率为损伤变量的线性演化模型,模型可以较好地表征氯盐冻融作用下再生混凝土的损伤劣化规律,为严寒盐渍地区再生混凝土使用提供理论依据。

关键词: 再生混凝土, 氯盐冻融耦合, 劣化规律, 抗压强度, 演化模型

Abstract: In order to study the damage and deterioration law of recycled concrete in severe cold and saline environment, the recycled coarse aggregate mass replacement rate of 0%, 50%, and 100% of recycled concrete were prepared to carry out the experimental study under the coupling of chloride and freeze-thaw. And its damage and deterioration law was discussed from the aspects of appearance, mass loss rate, relative dynamic elastic modulus and compressive strength. The results show that the damage to recycled aggregate concrete caused by chloride and freeze-thaw increases with the increase in the replacement rate of recycled aggregate.Compared with 200 freeze-thaw cycles and 0 freeze-thaw cycles, the mass loss rate, relative dynamic elastic modulus and relative compressive strength of the recycled concrete with 100% replacement rate decrease by 6.8%, 54.2% and 50.5%, respectively. The mass loss rate used to evaluate the durability of recycled concrete against salt and freezing has certain limitations. The loss rate of compressive strength is more suitable to characterize the degree of durability damage of recycled concrete than the relative dynamic modulus. A linear evolution model based on the loss of compressive strength as the damage variable is established. The model characterizes well the damage and deterioration of recycled concrete under the action of chloride and freeze-thaw, and provides a theoretical basis for the use of recycled concrete in severe cold and saline areas.

Key words: recycled concrete, coupling of chloride and freeze-thaw, deterioration law, compressive strength, evolution model

中图分类号:

TU528

解国梁, 申向东, 刘金云, 张斌. 氯盐冻融耦合作用下再生混凝土损伤劣化规律[J]. 硅酸盐通报, 2021, 40(2): 473-479.

XIE Guoliang, SHEN Xiangdong, LIU Jinyun, ZHANG Bin. Deterioration Law of Recycled Concrete under the Coupling of Chloride and Freeze-Thaw[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 473-479.

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氯盐冻融耦合作用下再生混凝土损伤劣化规律

Deterioration Law of Recycled Concrete under the Coupling of Chloride and Freeze-Thaw

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