低碳超高性能混凝土单轴受压力学性能  

Mechanical Properties of Low-carbon Ultra-high PerformanceConcrete under Uniaxial Compression

作　　者：黄乐[1] 苏凯栋 高奔浩 池寅[1] 徐礼华[1] HUANG Le;SU Kai-dong;GAO Ben-hao;CHI Yin;XU Li-hua(School of Civil Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072

出　　处：《长江科学院院报》2025年第4期183-192,共10页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(52378258);湖北省自然科学基金项目(2022CFB604)。

摘　　要：为解决超高性能混凝土水泥用量成倍增加所带来的高碳排放问题,采用高炉矿渣、粉煤灰和硅灰等材料大掺量替代硅酸盐水泥,制备了一种低水泥含量的低碳超高性能混凝土(LC-UHPC)。考虑水泥替代率、钢纤维体积掺量和水胶比等3个因素,设计制作了11组共154个试件,通过不同龄期的立方体抗压试验、抗折试验与单轴受压试验研究了LC-UHPC破坏形态、基本强度与变形能力等力学性能的变化规律,并根据试验结果建立了单轴受压应力-应变全曲线数学方程。结果表明:LC-UHPC轴心受压破坏形态为剪切破坏,钢纤维掺入能明显改善LC-UHPC各项力学性能指标;与传统UHPC相比,LC-UHPC的水泥替代率最高可达70%,其28 d单轴抗压强度可达149.09 MPa;建立的轴心受压应力-应变曲线方程能够较好地预测LC-UHPC单轴受压下的力学响应全过程,可为LC-UHPC力学性能研究及其结构构件的设计计算提供有益参考。To tackle the high carbon emissions issue resulting from doubling the cement dosage in ultra-high performance concrete(UHPC),a low-carbon ultra-high performance concrete(LC-UHPC)was developed by replacing a large proportion of Portland cement with granulated blast furnace slag,fly ash,and silica fume.Eleven groups in a total of 154 specimens were fabricated with three factors,namely,cement replace ratio,steel fiber volume content,and water-binder ratio taken into account.Through cube compression tests at different ages,flexural tests,and uniaxial compression tests,the mechanical properties of LC-UHPC,including failure patterns,basic strength,and deformation capacity,were analyzed.Based on the test results,a mathematical equation for the stress-strain curve under uniaxial compression was derived.Results indicated that the LC-UHPC displays shear failure mode under uniaxial compression.Moreover,the addition of steel fibers significantly enhances the mechanical properties of LC-UHPC.Compared with conventional UHPC,up to 70%of the cement in LC-UHPC can be replaced,and its 28-day compressive strength can reach 149.09 MPa.The established axial stress-strain equation can accurately predict the mechanical responses of LC-UHPC under uniaxial compression.This equation provides valuable insights for studying the mechanical properties of LC-UHPC and the design of related structural components.

关 键 词：超高性能混凝土 低水泥含量 单轴受压试验 力学性能 应力-应变关系 

分 类 号：TU528[建筑科学—建筑技术科学]