碱激发矿粉海水海砂混凝土与CFRP筋粘结性能研究  

STUDY ON THE BOND PERFORMANCE BETWEEN CFRP BARS AND ALKALI-ACTIVATED SLAG SEAWATER AND SEA SAND CONCRETE

作　　者：徐金金 杨树桐[1] 刘治宁 XU Jin-jin;YANG Shu-tong;LIU Zhi-ning(Department of Civil Engineering,College of Engineering,Ocean University of China, Qingdao, Shandong 266100, China;Qingdao Ocean University Construction Engineering Testing and Appraisal Center, Qingdao, Shandong 266100, China)

机构地区：[1]中国海洋大学工程学院土木工程系,山东青岛266100 [2]青岛海大建设工程检测鉴定中心,山东青岛266100

出　　处：《工程力学》2019年第B06期175-183,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51778591)

摘　　要：该文通过试验分析研究了碱激发矿粉海水海砂混凝土与碳纤维筋(Carbon Fiber Reinforced Polymer)筋的粘结性能。分别考虑了碱激发矿粉淡水河砂混凝土(FRASC)、碱激发矿粉淡水海砂混凝土(FSASC)、碱激发矿粉海水河砂混凝土(SRASC)和碱激发矿粉海水海砂混凝土(SSASC)四种碱激发矿粉混凝土(ASC),并与钢筋的粘结性能进行了对比。试验中分别采用直径为8 mm的CFRP筋和HRB400带肋钢筋,粘长分别为2.5 d、5 d、7.5 d、10 d和15 d(d为筋的直径)。结果表明:粘长为15 d的试件,CFRP筋的试件全部劈裂破坏,钢筋粘长为10 d、15 d的试件全部为钢筋拉断破坏;粘长为2.5 d的CFRP筋试件将筋表面的脱模带拉断而出现第二个峰值;粘结滑移曲线可分为微滑移阶段、滑移阶段、剥离阶段、软化阶段和残余阶段。To study the bond performance between CFRP bars and alkali-activated slag seawater and sea sand concrete,pull-out tests were carried out for 200 specimens with different types of bars(CFRP bars and steel bars),different bond lengths(2.5 d,5 d,7.5 d,10 d and 15 d)and four types of concrete including fresh water and river sand alkali-activated slag concrete(FRASC),fresh water and sea sand alkali-activated slag concrete(FSASC),seawater and river sand alkali-activated slag concrete(SRASC)and seawater and sea sand alkali-activated slag concrete(SSASC).In the test,all specimens with CFRP bars and bonding lengths of 15 d exhibited splitting failure of the concrete,whereas those with steel bars and bond lengths of 10 d and 15 d exhibited tensile fracture of the steel bars.The loading stage for the specimens with CFRP bars and bond lengths of 2.5 d has a second peak because the external bundle band of the CFRP bars was snapped.The bond-slip curve can be divided into five stages,that is,the micro slip stage,slide stage,stripping stage,softening stage and residual stage.

关 键 词：建筑材料 碱激发矿粉混凝土 拉拔试验 粘结性能 破坏形态 

分 类 号：TU377.9[建筑科学—结构工程]