【作者】 王占桥； 高丹盈； 朱海堂； 汤寄予；

【Author】 WANG Zhanqiao ,GAO Danying,ZHU Haitang , TANG Jiyu(Research Center of New Style Building Materials-Structure,Zhengzhou University,Henan,Zhengzhou,450002,China)

【机构】 郑州大学新型建材与结构研究中心；

【摘要】 利用楔劈拉伸试验。通过8组共24个试件尺寸为200mm×170mm×100mm楔劈试件的试验,研究了聚丙烯纤维掺量对高强混凝土断裂韧度(KIC)、断裂能(GF)和临界裂缝嘴张开位移(CMODC)的影响,探讨了聚丙烯纤维高强混凝土裂缝前缘应变场分布。结果表明:在本次试验条件下,聚丙烯纤维对高强混凝土断裂韧度基本没有影响,但可以提高高强混凝土的断裂能和临界裂缝嘴张开位移;随着纤维掺量的增加,断裂能和断裂能增益比都有不同程度的提高,临界裂缝张开位移有减小的趋势,临界裂缝嘴张开位移增益比变化没有明显的规律性;聚丙烯纤维对高强混凝土裂缝前缘应变场分布改善不显著;聚丙烯纤维主要改善高强混凝土的裂后行为。更多还原

【Abstract】 By the wedge-splitting tensile test on the twenty-four specimens of polypropylene fiber reinforced high-strength concrete (HSC) with the size of 200mm × 170mm× 100mm,the impacts of polypropylene dosage upon the fracture properties, such as stress intensity factor (KIC),fracture energy (GF),as well as critical crack mouth opening displacement (CMODC) of polypropylene reinforced HSC have been investigated. The test results indicate that the addition of polypropylene has no impacts upon the KIC , but increases the GF and CMODC. With the increase dosage of polypropylene, GF and the increment ratio of GF increase respectively, but CMODC decreased, and the varying of increment ratio of CMODChas no disciplinarian. Polypropylene improves the properties of HSC at the post-cracking zone.更多还原