碳化-干湿循环作用下风积沙混凝土劣化规律

董伟; 周梦虎; 杭美艳; 薛刚

doi:10.13204/j.gyjzG22022206

碳化-干湿循环作用下风积沙混凝土劣化规律

doi: 10.13204/j.gyjzG22022206

董伟^1,2,
周梦虎^1, ,,
杭美艳¹,
薛刚¹

1. 内蒙古科技大学土木工程学院, 内蒙古包头 014010;
2. 内蒙古自治区土木工程安全与耐久性重点实验室, 内蒙古包头 014010

基金项目:

内蒙古科技大学建筑科学研究所开放基金项目(JYSJJ-2021Q01)。

内蒙古科技大学创新基金项目(2019QDL-B48)

国家自然科学基金资助项目(52268044)

内蒙古自治区自然科学基金项目(2021LHMS05019)

详细信息

作者简介:
董伟,男,1987年出生,博士,副教授。

通讯作者:
周梦虎,784910006@qq.com。

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出版历程
- 收稿日期: 2022-02-22

Deterioration Law of Aeolian Sand Concrete Under Carbonation and Dry-Wet Cycles

1. College of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Inner Mongolia Autonomous Region Key Laboratory of Civil Engineering Safety and Durability, Baotou 014010, China

摘要

摘要: 以明确碳化-干湿循环作用下风积沙混凝土表观形态、质量、吸水率、抗压强度等耐久性能指标的损伤劣化规律为目的,将风积沙全部替代普通河砂制备全风积沙混凝土,对其进行碳化试验(碳化龄期为0 d、14 d、28 d),采用外观形貌、抗压强度、质量、吸水率等参数表征风积沙混凝土经历碳化-干湿循环作用下耐久性能损伤劣化规律。结果表明:碳化、干湿循环前期形貌变化较小,后期逐渐出现网状裂缝;随干湿循环次数增加,风积沙混凝土的抗压强度先增加后减小;在干湿循环25次内质量不断增加,其中未碳化混凝土质量增加最多,碳化龄期28 d质量增加最少;碳化作用延缓了表面盐结晶的出现,使风积沙混凝土的抗压强度有所提升,提升了风积沙混凝土在干湿环境下的耐久性。
- 风积沙混凝土 /
- 干湿循环 /
- 碳化作用 /
- 抗压强度 /
- 耐久性 /
- 吸水率
Abstract: In order to clarify the damage deterioration law of durability indexes such as apparent morphology, quality, water absorption and compressive strength of aeolian sand concrete under carbonization and dry-wet cycles, aeolian sand was completely replaced by ordinary river sand to prepare aeolian sand concrete, and its carbonization test (carbonization age was 0 d, 14 d and 28 d) was carried out, apparent morphology, compressive strength, quality, water absorption and other parameters were used to characterize the deterioration law of durability of aeolian sand concrete under carbonation and dry-wet cycles. The results showed that the morphology changed little in the early stage of carbonization and dry-wet cycles, and network cracks gradually appeared in the later stage; with the increase of dry-wet cycles, the compressive strength of aeolian sand concrete first increased and then decreased; the mass of non carbonated concrete increased the most in 25 seconds of dry-wet cycles, and the mass of carbonated concrete increased the least in 28 days of carbonation age; carbonation delayed the occurrence time of surface salt crystallization, improved the compressive strength of aeolian sand concrete, as well as the durability of aeolian sand concrete in dry and wet environment.
- aeolian sand concrete /
- dry-wet cycle /
- carbonization /
- compressive strength /
- durability /
- water absorption

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