持续荷载和氯盐侵蚀下钢筋与陶粒混凝土黏结性能研究

Study on Bond Properties Between Steel Bars and Ceramsite Concrete Under Sustained Loads and Chloride Corrosion

为研究持续荷载和氯盐侵蚀共同作用下普通螺纹钢筋与陶粒混凝土之间黏结性能的变化规律。本研究通过拉拔试验分析陶粒混凝土强度、盐溶液浓度以及持荷水平3种因素的影响,共计66个拉拔试件,并提出持续荷载和氯盐侵蚀共同作用下的极限黏结强度计算式。结果表明:持续荷载和氯盐侵蚀共同作用下的试件发生劈裂破坏,与对照试件相同,但劈裂后产生的碎屑增多;持荷水平对极限黏结强度的影响作用不同,盐溶液浓度为5%~15%时,持荷水平20%的试件极限黏结强度较未持荷试件增大,但持荷水平40%时,试件极限黏结强度降低。提出的极限黏结强度计算式拟合结果较好。

In order to study the change law of bonding performance between ordinary deformed steel bar and ceramic concrete under the combined action of continuous load and chloride corrosion. The study analyzed the influence of three factors of ceramic concrete strength, salt solution concentration and load holding level through pull-out test, a total of 66 pull-out specimens, and putted forward the calculation formula of ultimate bond strength under the combined action of continuous load and chloride corrosion. It was found that the specimen under the combined action of continuous load and chloride erosion had splitting failure, which was the same as the control specimen, but the debris produced after splitting increased. The effect of load holding level on the ultimate bond strength was different. When the salt solution concentration was 5%~15%, the ultimate bond strength of the specimen with 20% load holding level was higher than that of the specimen without load holding, but when the load holding level was 40%, the ultimate bond strength of the specimen was lower. The fitting result of the proposed calculation formula of ultimate bond strength was good.