复掺渗透结晶材料和纳米二氧化硅混凝土梁裂缝自修复试验研究  

Experiment study on self-repairing cracks of concrete beams mixed with permeable crystalline materials and nano-silica

作　　者：符仁建 陈业强 姚嘉诚 刘荣桂 FU Renjian;CHEN Yeqiang;YAO Jiacheng;LIU Ronggui(Architecture and Civil Engineering,Nantong Institute of Technology,Nantong 226000,China;Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]南通理工学院建筑工程学院,江苏南通226000 [2]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《混凝土》2024年第11期159-163,167,共6页Concrete

基　　金：国家自然科学基金(51778272);南通理工学院省级科技服务平台培育项目(XQPT202102)。

摘　　要：为研究复掺水泥基渗透结晶型防水材料(CCCW)和纳米二氧化硅(NS)对钢筋混凝土梁裂缝自修复性能的影响,采用复掺3%CCCW和1%NS混凝土制作钢筋混凝土梁,研究了其在不同的预制裂缝宽度和养护条件下表面裂缝修复前后的变化以及受弯后梁的裂缝开展情况、破坏模式、跨中截面应变分布、挠度和极限荷载。结果表明:复掺CCCW和NS与单掺CCCW对钢筋混凝土梁的受弯性能以及裂缝自修复性能均有提升作用,且复掺CCCW与NS的提升效果优于单掺CCCW;复掺CCCW和NS钢筋混凝土梁裂缝自修复性能与预制裂缝的宽度有关,预制裂缝宽度越大,梁的自修复效果越差,大于0.3 mm的预制裂缝基本没有愈合的迹象,受弯性能并未得到明显的修复和提升;潮湿的养护环境有利于提升复掺CCCW和NS钢筋混凝土梁的裂缝自修复性能,但氯离子的侵蚀会降低钢筋混凝土梁的整体受弯性能。In order to study the influence of cementitions capillary crystalline water proofing materials(CCCW)and nano-silica(NS)on the self-repairing performance of reinforced concrete beams,reinforced concrete beams were made by mixing 3%CCCW and 1%NS concrete,and the changes of surface cracks before and after repairing under different prefabricated crack widths and curing conditions,as well as the crack development,failure mode,strain distribution in mid-span section,deflection and ultimate load of the beams after bending were studied.The results show that mixed CCCW and NS and single CCCW can improve the flexural performance and crack self-repairing performance of reinforced concrete beams,and the improvement effect of mixed CCCW and NS is better than that of single CCCW.The self-repairing performance of CCCW and NS reinforced concrete beams is related to the width of prefabricated cracks.The larger the width of prefabricated cracks,the worse the self-repairing effect of beams.The prefabricated cracks larger than 0.3 mm basically have no signs of healing,and the flexural performance has not been obviously repaired and improved.The humid curing environment is beneficial to improve the crack self-repairing performance of reinforced concrete beams mixed with CCCW and NS,but the erosion of chloride ions will reduce the overall flexural performance of reinforced concrete beams.

关 键 词：水泥基渗透结晶型防水材料 纳米二氧化硅 钢筋混凝土梁 自修复 受弯性能 

分 类 号：TU528.07[建筑科学—建筑技术科学]