摘要
为减少超高性能混凝土(UHPC)的河砂用量,改善其压缩破坏特性,本研究通过设计四因素四水平正交试验,分析了机制砂、橡胶颗粒、水胶比和钢纤维在不同水平状态下对UHPC流动性和抗压强度的影响,获得了综合性能最佳的优选组,并探究了橡胶-机制砂UHPC的压缩破坏能量演化特征。结果表明:1)在各因素中,对UHPC拌合物的流动性和抗压强度影响最大的因素分别为水胶比和钢纤维,随着水胶比增加,UHPC的流动性显著增加,而抗压强度与钢纤维掺量之间为正效应;2)当橡胶和机制砂替代河砂掺量分别10%和40%(橡胶为等体积替代河砂,机制砂为等质量替代河砂,相当于节约了50%的河砂)时,试件抗压强度仍达到118.5 MPa;3)从破坏形态和能量演化看,钢纤维和橡胶颗粒混掺后UHPC表现出脆-延转换力学特征,优选组UHPC在达到应力峰值时较对照组保持了较好的完整度。
In order to reduce the amount of river sand in ultra-high performance concrete(UHPC)and improve its compressive fracture characteristics,the effects of manufactured sand,rubber particles,water-binder ratio and steel fiber on the fluidity and compressive strength of UHPC at different levels were analyzed through the design of four-factor and four-level orthogonal tests,and the optimal group with the best comprehensive performance was obtained.The energy evolution characteristics of compressive failure of rubber-manufactured sand UHPC were investigated.The results show that:1)among the factors,the greatest influence on the fluidity and compressive strength of UHPC mix are water-binder ratio and steel fiber respectively.The fluidity of UHPC increases significantly with the increase of water-binder ratio,while the compressive strength has a positive effect on steel fiber content.2)When rubber content and manufactured sand replaces river sand by 10%and 40%respectively(rubber replaces river sand with equal volume,and manufactured sand replaces river sand with equal quality,which is equivalent to saving 50%of river sand),the compressive strength of UHPC reaches 118.5 MPa.3)From the view of failure morphology and energy evolution,the UHPC shows brittle-elongation transformation mechanical characteristics after mixing steel fiber and rubber particles.UHPC in the optimal group maintained better integrity than those in the control group when the stress peak was reached.
作者
葛进进
高小羽
陈佩圆
黄伟
张礼明
杜苏永
GE Jinjin;GAO Xiaoyu;CHEN Peiyuan;HUANG Wei;ZHANG Liming;DU Suyong(Institute of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Anhui Coach Design&Research Institute of Building Materials Co.,Ltd.,Wuhu 241070,China;School of Architecture and Arts,Huainan Union University,Huainan 232038,China)
出处
《硅酸盐通报》
CAS
北大核心
2024年第8期2806-2816,共11页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金项目(52104116,52008003)
安徽省高校学科拔尖人才学术资助项目(gxbjZD2022111)。
关键词
机制砂
UHPC
硬脆性
压缩破坏
能量演化
正交试验
manufactured sand
UHPC
hard and brittle
compressive failure
energy evolution
orthogonal test
