长江科学院院报2024，Vol.41Issue(3)：134-141,147,9.DOI:10.11988/ckyyb.20221336
基于Weibull分布的煤矸石对混凝土断裂损伤特性的影响
Revealing the Impact of Coal Gangue on Fracture Damage Characteristics of Concrete Based on Weibull Distribution
摘要
Abstract
Three-point bending tests were conducted on coal gangue concrete with Ⅰ-shaped fractures.The aim was to investigate the impacts of coal gangue mass replacement rate,fly ash mass replacement rate,and water-cement ratio on load-crack opening displacement curve,load-midspan deflection curve,fracture toughness,and fracture energy.The obtained results were utilized in association with damage mechanics and the Weibull distribution func-tion to establish the fracture damage constitutive model of coal gangue concrete.The findings indicate that the coal gangue mass replacement rate exerts the most significant influence on the fracture performance of coal gangue con-crete with prefabricated Ⅰ-type cracks,while fly ash mass replacement rate has a greater impact on the fracture toughness,and the water-cement ratio exhibits a greater influence on fracture energy.The optimal combination for enhancing the fracture toughness and fracture energy of coal gangue concrete is determined as follows:25％coal gangue mass replacement rate,10％fly ash mass replacement rate,and 0.5 water cement ratio.Upon comparison,the stress-strain curve derived from the constitutive model aligns closely with the test curve.These findings offer val-uable insights for the formulation and practical application of gangue concrete.关键词
煤矸石混凝土/正交试验/断裂韧度/断裂能/Weibull分布/损伤本构模型Key words
coal gangue concrete/orthogonal test/fracture toughness/fracture energy/Weibull distribution/dam-age constitutive model分类
建筑与水利引用本文复制引用
李永靖,程耀辉,文成章,胡硕,尚昀郅,宋洋..基于Weibull分布的煤矸石对混凝土断裂损伤特性的影响[J].长江科学院院报,2024,41(3):134-141,147,9.基金项目
国家自然科学基金项目(51974146,52174078) （51974146,52174078）
