摘要
为研究硼酸和硼酸氯盐对混凝土结构的影响,对50个混凝土试件、27根钢筋和32根带裂缝RC梁进行腐蚀后的力学性能试验.试验参数包括腐蚀时间(0~150 d)、腐蚀溶液类型(清水、硼酸和硼酸氯盐溶液)、裂缝宽度(0.0~0.2 mm,>0.2 mm).结果表明:5%硼酸溶液导致混凝土产生诸多微孔隙及微裂缝,与清水相比,硼酸和硼酸氯盐溶液腐蚀150 d,引起混凝土抗压强度分别降低2.7%和3.3%,且钢筋质量损失率更大;RC梁的屈服弯矩和承载力随腐蚀时间增加先增长后减小,随裂缝宽度增加分别下降14.5%和9.1%;基于混凝土和钢筋材料劣化,结合初始裂缝影响,提出了硼酸和硼酸氯盐腐蚀溶液中RC梁的承载力计算公式.
To investigate the effect of boric acid and coupled solution of boric acid and chlorine on concrete structures,50 concrete specimens,27 steel bars and 32 RC beams with cracks were tested for mechanical properties after corrosion.The test parameters include corrosion time(0~150 days),corrosion solution type(water,boric acid and coupled solution of boric acid and chlorine)and crack width(0.0~0.2 mm,>0.2 mm).The results show that 5% boric acid solution led to many microscopic pores and microcracks in the concrete,and boric acid and coupled solution of boric acid and chlorine could lead to 2.7% and 3.3%reduction in the concrete compressive strength and greater rate of steel bar mass loss compared to water after 150 days of corrosion;The yield moment and bearing capacity of RC beams first increase and then decrease with the increase of corrosion time,and the yield moment load capacity of RC beams decreases by 14.5% and 9.1%,respectively,with the increase of crack width compared with that of the uncracked beams;Based on the deterioration of concrete and steel bar materials,and in combination with the effect of the initial cracks,the formulas for calculating the bearing capacity of RC beams in the corrosion solution of boric acid and coupled solution of boric acid and chlorine were proposed.
作者
金浏
杨健
吴洁琼
杜修力
JIN Liu;YANG Jian;WU Jieqiong;DU Xiuli(The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《华中科技大学学报(自然科学版)》
北大核心
2025年第8期67-74,89,共9页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(52108106).
关键词
钢筋混凝土梁
硼酸
抗压强度
锈蚀率
抗弯性能
承载力
RC beams
boric acid
compressive strength
corrosion rate
flexural performance
bearing capacity
