粗骨料对超高性能应变硬化水泥基复合材料(UHP-SHCC)性能的影响  

Influence of coarse aggregates on properties of ultra-high performance-strain hardening cementitious composites(UHP-SHCC)

作　　者：丁宏 张贵[3] 石小磊 朋改非[3] 米应花 DING Hong;ZHANG Gui;SHI Xiaolei;PENG Gaifei;MI Yinghua(Beijing Construction Engineering Group,Advanced Construction Materials Limited Liability Company,Beijing 100015,China;Beijing Construction Engineering Group,Hengjun Engineering Detection Limited Company,Beijing 102615,China;Faculty of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京建工新型建材有限责任公司,北京100015 [2]北京建工恒均工程检测有限公司,北京102615 [3]北京交通大学土木建筑工程学院,北京100044

出　　处：《混凝土与水泥制品》2024年第6期59-63,共5页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51878032);北京市自然科学基金项目(8212013、8172036);北京建工新型建材有限责任公司科技基金项目(RDJC202101、RDJC202201)。

摘　　要：根据超高性能混凝土(UHPC)的制备理论和应变硬化水泥基复合材料(SHCC)的设计原理,制备了超高性能应变硬化水泥基复合材料(UHP-SHCC),研究了钢纤维改性处理和粗骨料的级配(最大粒径分别为6.00、8.00、9.75 mm)与掺量(0、5%、11%、15%)对UHP-SHCC抗压强度和拉伸行为的影响。结果表明:与未改性钢纤维相比,改性钢纤维使UHP-SHCC的应变硬化行为更明显;通过合理调控粗骨料的级配和掺量,有效提高了UHP-SHCC的抗压强度,改善了UHP-SHCC的拉伸应变硬化效果,但随着龄期从7 d增至28 d,UHP-SHCC的应变硬化效果略有减弱。Based on the preparation theory of ultra-high performance concrete(UHPC)and the design principle of strain-hardening cement-based composite(SHCC),the ultra-high performance-strain hardening cementitious composite(UHP-SHCC)was prepared.The effects of steel fiber modification treatment,and the gradation(maximum particle size of 6.00,8.00,9.75 mm)and content(0,5%,11%,15%)of coarse aggregates on the compressive strength and tensile behavior of UHP-SHCC were studied.The results show that,compared with unmodified steel fibers,modified steel fibers make the strain hardening behavior of UHP-SHCC more pronounced.By reasonably adjusting the gradation and content of coarse aggregates,the compressive strength and the tensile strain hardening effect of UHP-SHCC can be effectively improved.However,as the age increases from 7 d to 28 d,the strain hardening effect of UHP-SHCC slightly weakens.

关 键 词：超高性能应变硬化水泥基复合材料(UHP-SHCC) 抗压强度 拉伸应变行为 粗骨料 钢纤维 

分 类 号：TU528.572[建筑科学—建筑技术科学]