混杂纤维增强超高性能透水混凝土的弯曲性能研究  

Flexural Properties of Hybrid Fiber-Reinforced Ultra-High Performance Pervious Concrete

作　　者：张玉斌[1,2,3] 鲍世辉 张聪 ZHANG Yubin;BAO Shihui;ZHANG Cong(Anhui Transport Consulting&Design Institute Co.,Ltd.,Hefei 230000,China;School of Environment and Civil Engineering,Jiangnan University,Wuxi 214000,China;Road Transportation Energy-saving and Environmental Protection Technology and Equipment Transportation Industry R&D Center(Hefei),Hefei 230000,China)

机构地区：[1]安徽省交通规划设计研究总院股份有限公司,合肥230000 [2]江南大学,环境与土木工程学院,无锡214000 [3]公路交通节能与环保技术及装备交通运输行业研发中心(合肥),合肥230000

出　　处：《硅酸盐通报》2022年第6期1955-1962,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51908247)。

摘　　要：超高性能透水混凝土(UHPPC)是海绵城市建设过程中不可或缺的重载道路铺装材料,但韧性不足是UHPPC重载铺装易于开裂的主要原因。本文通过引入碳酸钙晶须、聚乙烯醇(PVA)纤维和聚乙烯(PE)纤维,制备了新型混杂纤维增强UHPPC材料,研究了其抗压强度、透水能力和弯曲性能。研究发现,添加PVA纤维或PE纤维均能够提高UHPPC的抗压强度、抗弯强度和极限挠度,且PVA纤维的提升效果优于PE纤维。与单掺PVA纤维或PE纤维相比,混杂使用碳酸钙晶须则进一步地提高了UHPPC的抗压强度、抗弯强度和极限挠度,与PE纤维与碳酸钙晶须混杂相比,PVA纤维混杂碳酸钙晶须对UHPPC抗压强度、抗弯强度、极限挠度和裂缝开展模式的改善效果最佳。但是,添加PVA纤维或PE纤维均降低了UHPPC的透水系数,而引入碳酸钙晶须则进一步加剧了透水系数的降低效果,尤其是混杂使用PVA纤维和碳酸钙晶须,UHPPC透水系数的下降最为明显,但依然达到了1.05 mm/s,满足工程使用要求。Ultra-high performance pervious concrete(UHPPC)is an indispensable material for heavy-duty road paving in the construction of sponge cities,but insufficient toughness is the main reason why UHPPC heavy-duty paving is easy to crack.In this paper,a novel hybrid fiber-reinforced UHPPC material was prepared by introducing CaCO_(3) whiskers,PVA fibers and PE fibers,and its compressive strength,water permeability and flexural properties were investigated.It is found that the addition of either PVA fibers or PE fibers improves the compressive strength,flexural strength and ultimate deflection of UHPPC,and the enhancement effect of PVA fibers is better than that of PE fibers.Compared with PVA fibers or PE fibers alone,the hybrid use of CaCO_(3) whiskers further improves the compressive strength,flexural strength and ultimate deflection of UHPPC.The hybrid blending of PVA fibers with CaCO_(3) whisker achieves greater improvement in compressive strength,flexural strength,ultimate deflection and flexural cracking pattern than PE fibers blending with CaCO_(3) whisker.However,the addition of PVA fibers or PE fibers reduces the water permeability coefficient of UHPPC,and the introduction of CaCO_(3) whiskers further aggravates this reduction effect.Especially the hybrid use of PVA fibers and CaCO_(3) whiskers in UHPPC,its water permeability coefficient decreases significantly,but still reaches 1.05 mm/s to meet the requirements of engineering application.

关 键 词：超高性能透水混凝土 碳酸钙晶须 聚乙烯纤维 聚乙烯醇纤维 弯曲性能 透水系数 

分 类 号：TU502[建筑科学—建筑技术科学]