摘要
研究了蒸汽养护对沙漠砂超高性能混凝土(UHPC)力学性能、抗渗性和孔结构的影响,其中沙漠砂按0~100%等质量取代石英砂。试验结果表明,随着沙漠砂掺量增加,UHPC抗压、抗折强度降低,同时毛细吸水率增大。蒸汽养护可以提高沙漠砂UHPC力学性能和抗渗性,且蒸养温度越高、时间越长,对UHPC力学性能和抗渗性的改善效果越好。同时,蒸汽养护使UHPC最可几孔径向左偏移,孔隙率降低。通过90℃蒸汽养护3 d,可提高沙漠砂在UHPC中的使用量至80%,并同时保证UHPC抗压强度和抗渗性无衰减。
Investigated the effect of steam curing on mechanical properties,permeability,and pore structure of ultra-high performance concrete(UHPC)made with desert sand(DS).The DS content ranged from 0 to 100%,by mass of quartz sand.The experimental results showed that the compressive and flexural strengths decreased,and the capillary sorptivity of UHPC increased with the increase in DS content.The mechanical properties and permeability of UHPC can be improved by steam curing.A higher steam curing temperature and longer curing duration can result in a greater improvement on mechanical properties and permeability of UHPC.Moreover,steam curing reduced the most probable diameter and porosity of UHPC.This is due to the enhanced pozzolanic reaction of silica fume,which can refine the pore structure and increase the degree of density of UHPC made with DS.For samples prepared with steam curing for 3 days at 90℃,the DS content can be increased to 80%where the compressive strength and permeability of UHPC were comparable to those made without DS.
作者
赵华
刘超群
黄煌煌
高小建
ZHAO Hua;LIU Chaoqun;HUANG Huanghuang;GAO Xiaojian(Jiangxi Transportation Institute Co.,Ltd.,Nanchang 330200,China;Project Construction Management Company of Jiangxi Communications Investment Group Co.,Ltd,Nanchang 330052,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)
出处
《混凝土》
CAS
北大核心
2022年第12期38-43,共6页
Concrete
基金
黑龙江省自然科学基金重点项目(ZD2021E007)
江西省道路材料与结构工程技术研究中心(20171BCD40017)
江西省交通运输厅科技项目(2021C0008)。
关键词
超高性能混凝土
蒸汽养护
沙漠砂
力学性能
毛细吸水率
孔结构
ultra-high performance concrete(UHPC)
steam curing
desert sand
mechanical properties
capillary sorptivity
pore structure
