西北工程技术学报2026，Vol.25Issue(1)：42-51,10.DOI:10.26974/j.cnki.XBGC.2026.01.006
基于DIC的珊瑚粉高强砂浆裂纹演化与强度阈值分析
Crack Evolution and Strength Threshold of Coral Powder High-Strength Mortar Based on Digital Image Correlation
摘要
Abstract
This study aims to develop a low-carbon and cost-effective high-strength mortar(HSM)suitable for island reef construction by partially replacing cement with coral powder(CP)at substitution rates of 0%,5%,10%,15%,20%,and 25%by mass.The mechanical properties of HSM were systematically investigated through uniaxial compression and Brazilian splitting tests,complemented by the digital image correlation(DIC)method.The results indicate that the strength of HSM follows a three-phase evolution pattern of"enhancement,inflection,and deterioration",as the CP content increases.The inflection point occurs at a 5%replacement rate,where the compressive and splitting tensile strengths are recorded at 123.30 and 29.98 MPa,respectively,reflecting increases of 8.6%and 6.2%compared to the control group without CP.When the replacement rate reaches 15%or more,a significant decrease in strength is observed;at a 20%replacement rate,the strength falls below that of the control group.The failure mode transitions from a single brittle fracture(characterized by straight cracks and concentrated strain bands)at lower replacement rates to a combined tension-shear failure(characterized by bifurcation of primary cracks and a dense formation of secondary cracks,with DIC indicating significant localization)at higher replacement rates.To ensure structural safety,toughness,and optimal material efficiency,it is recommended that the CP replacement rate for HSM in island reef construction be maintained between 5%and 10%.关键词
珊瑚粉/高强砂浆/单轴压缩/巴西劈裂/数字图像相关Key words
coral powder/high-strength mortar/uniaxial compression/Brazilian splitting/digital image correlation分类
建筑与水利引用本文复制引用
李鹏鑫,陈浩林,周海峰,熊潇,刘永亮,郑超,王刚..基于DIC的珊瑚粉高强砂浆裂纹演化与强度阈值分析[J].西北工程技术学报,2026,25(1):42-51,10.基金项目
中国博士后科学基金项目(2023M732689) （2023M732689）
精细爆破国家重点实验室开放基金项目(PBSKL25B01) （PBSKL25B01）
绍兴市科技计划项目(2022A13003) （2022A13003）
