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冻融后引气再生混凝土与钢筋黏结性能的试验研究

ISSN号：1002-3550
期刊名称：《混凝土》
时间：0
分类：TU528.01[建筑科学—建筑技术科学]
作者机构：[1]青岛理工大学土木工程学院,山东青岛266033, [2]山东省蓝色经济区工程建设与安全协同创新中心,山东青岛266033
相关基金：国家自然科学基金资助项目（51208273）;山东省高等学校科技计划项目（J12LG07）;水资源与水电工程科学国家重点实验室开放研究项目（20138113）;中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究项目（IWHR-SKL-201305）

关键词：引气再生混凝土, 快速冻融循环, 引气剂, 黏结强度, 黏结滑移, entraining recycled concrete , rapid freezing - thawing cycles, air - entraied agents , bond strength, bond slip

中文摘要：

通过在再生混凝土中添加引气剂配制出引气再生混凝土,并制作了不同直径钢筋-引气再生混凝土中心拔出试件。将试件放在冻融环境为淡水与盐浓度为5%的人工海水中进行了25、50、75次快速冻融循环,然后对未经冻融循环作用以及经过不同次数冻融循环作用的中心拔出试件进行了黏结性能试验研究。试验中测试了钢筋与混凝土间的黏结强度、黏结滑移,观察了试件开裂形态随施加荷载、钢筋直径、冻融循环次数的变化情况。依据试验结果,分析了钢筋直径、冻融循环次数对黏结强度、黏结滑移的影响规律。试验表明,随着冻融循环次数的增加,钢筋与混凝土黏结力逐渐下降,峰值荷载减小,峰值滑移量变大,且在海水中冻融的试块黏结力损失更为严重。

英文摘要：

By adding air entraining agent in the recycled concrete and formulated entraining recycled concrete, then I produced different diameter steel - entraining center pull out of recycled concrete specimens.The specimen were 25,50,75 times faster freezing - thawing cycle in the environment that is freshwater and salt concentration of 5% artificial seawater, and then these center pull specimens what is without the effect of freezing - thawing cycles and through the different number of freezing - thawing cycle were studied bonding prop- erties.Experiment tested the bond strength and bond slip between steel and concrete, observed specimen cracking form with applied load,the bar diameter and the changes of freezing -thawing cycles.Based on test results,it analyzed the steel bar diameter, freezing and thawing cycles on the effect of bond strength and the bond - slip. Tests show that with the increase in freezing - thawing cycles, steel and concrete bond strength decreases, the peak load decreases, the peak slip becomes large, and the specimen of freezing and thawing in seawater adhesion loss is more serious.