东南大学学报（英文版）2025，Vol.41Issue(2)：171-179,9.DOI:10.3969/j.issn.1003-7985.2025.02.006
喷射超高性能混凝土轴压力学特性与损伤演变规律
Mechanical properties and damage evolution of sprayed ultrahigh performance concrete under uniaxial compression
摘要
Abstract
To investigate the effects of the spraying process and different fibers on the mechanical properties and failure patterns of ultrahigh performance concrete(UHPC),three types of fibers were used.These fibers were formed using both spraying and molding methods.Uniaxial compression tests were conducted,and two nondestructive monitoring techniques,acoustic emission(AE)and digital image cor-relation,were employed to monitor the uniaxial compres-sion tests.The results indicated that the compressive strength of UHPC with single steel fibers and hybrid fibers increased by about 19%and 14%compared with those of UHPC with polyoxymethylene fibers.In comparison with molded UHPC,sprayed UHPC showed a slight improve-ment in compressive strength.Specimens containing steel fibers exhibited better post-cracking ductility,whereas those with only polyoxymethylene fibers displayed a certain degree of brittle failure.In sprayed UHPC,the onset of sig-nificant internal damage was delayed,which was related to the redistribution of internal fibers.The failure of UHPC was characterized by primary tensile cracks,supplemented by shear cracks.The spraying process can better restrict the development of tensile cracks in UHPC.Sprayed UHPC typically exhibited multiple crack developments leading to failure,whereas molded UHPC generally failed in the form of a single main crack penetrating the specimen.The addi-tion of steel fibers delayed the occurrence of local stress concentration zones,aligning well with AE monitoring data.关键词
喷射UHPC/声发射/数字图像相关/单轴压缩/裂缝扩展/损伤演化Key words
sprayed ultrahigh performance concrete/acous-tic emission/digital image correlation/uniaxial compres-sion/crack propagation/damage evolution分类
土木建筑引用本文复制引用
王张翔,陈徐东,冷勇,张国志,陈飞翔,姚天豫..喷射超高性能混凝土轴压力学特性与损伤演变规律[J].东南大学学报（英文版）,2025,41(2):171-179,9.基金项目
The National Natural Science Foundation of China(No.52379124),the National Key Research and Development Program of China(No.2021YFB2600200). （No.52379124）
