自然暴露与盐雾加速环境下钢筋混凝土劣化规律及等效关系

doi:10.13229/j.cnki.jdxbgxb.20220414

摘要/Abstract

摘要：

针对西部盐渍土地区病害严重的问题，选取西部盐渍土地区典型环境开展钢筋混凝土自然暴露试验，同时模拟当地腐蚀环境设计室内盐雾干湿循环加速试验；采用钢筋腐蚀电流和混凝土损伤度表征钢筋混凝土内部钢筋及保护层的劣化规律；基于Weibull分布函数建立两种环境下钢筋混凝土的劣化模型，并进行竞争失效分析；利用可靠度等价条件，结合当量概念，建立两种环境下的等效关系。结果表明：钢筋混凝土在室内加速与自然暴露环境下的劣化规律相似，其规律均是强化效应和劣化效应相互作用的结果；Weibull分布函数可以有效地描述钢筋混凝土在室内加速与自然暴露环境下的性能劣化过程；内部钢筋劣化至中位寿命的时间略早于混凝土保护层；室内盐雾干湿循环加速劣化钢筋混凝土1 d可模拟盐渍土地区自然暴露劣化12.7 d。

关键词: 土木工程材料, 钢筋混凝土, 西部盐渍土地区, 腐蚀劣化, Weibull分布函数, 等效关系

Abstract:

In view of the problem of serious disease in the western saline soil region， this paper selects a typical environment in the western saline soil region to carry out natural exposure test of reinforced concrete， and simulates the local corrosion environment to design indoor salt spray dry and wet cycle acceleration test. The corrosion current density and concrete damage degree were used to characterize the deterioration laws of reinforcement and protective layer. Based on Weibull distribution function， the deterioration model of reinforced concrete under the two environments were established， and the competitive failure analysis was carried out. Finally， the equivalent relationship between the two environments were established by using the equivalent condition of reliability and the concept of equivalent. The results show that the deterioration law of reinforced concrete under in indoor acceleration is similar to that under natural exposure， and the laws are the result of the interaction of strengthening and deterioration effects. The Weibull distribution function can effectively describe the deterioration process of reinforced concrete under indoor acceleration and natural exposure environment. The time of internal reinforcement deterioration to median life is slightly earlier than that of the concrete protective layer. Indoor salt spray dry and wet cycles accelerated deterioration of reinforced concrete for 1 day can simulate 12.7 days of natural exposure deterioration in saline soil region.

Key words: civil engineering material, reinforced concrete, western saline soil region, corrosion deterioration, Weibull distribution functions, equivalence relations

中图分类号:

TU528.1

冯琼,田浩正,乔宏霞,念腾飞,韩文文. 自然暴露与盐雾加速环境下钢筋混凝土劣化规律及等效关系[J]. 吉林大学学报(工学版), 2024, 54(2): 494-505.

Qiong FENG,Hao-zheng TIAN,Hong-xia QIAO,Teng-fei NIAN,Wen-wen HAN. Corrosion deterioration and equivalent relationship between natural exposure and salt spray accelerated environment of reinforced concrete[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(2): 494-505.

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材料	SiO₂	Fe₂O₃	Al₂O₃	CaO	MgO	TiO₂	SO₃	K₂O	MnO	IL
水泥	26.3	4.4	10.6	49.2	3.2	1.0	2.0	1.2	0.4	1.7
粉煤灰	45.4	6.6	30.2	8.9	1.8	1.3	1.9	1.5	0.2	2.2

材料	含量	材料	含量
水泥	315	水	158
细骨料	634	粉煤灰	135
粗骨料	1167	减水剂	适量

相关参数	混凝土损伤度		腐蚀电流密度
相关参数	干湿循环	自然暴露	干湿循环	自然暴露
m	2.275	3.176	3.801	5.325
θ	173.5	3068.6	167.7	1917.3

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