长江科学院院报 ›› 2024, Vol. 41 ›› Issue (3): 134-141.DOI: 10.11988/ckyyb.20221336

• 水工结构与材料 • 上一篇    下一篇

基于Weibull分布的煤矸石对混凝土断裂损伤特性的影响

李永靖1,2,3, 程耀辉1, 文成章1, 胡硕1, 尚昀郅1, 宋洋4   

  1. 1.辽宁工程技术大学 土木工程学院, 辽宁 阜新 123000;
    2.辽宁工程技术大学 辽宁省煤矸石资源化利用及节能建材重点实验室, 辽宁 阜新 123000;
    3.山东商务职业学院 建筑工程学院, 山东 烟台 264670;
    4.辽宁工程技术大学建筑与交通学院, 辽宁 阜新 123000
  • 收稿日期:2022-10-10 修回日期:2022-12-25 出版日期:2024-03-01 发布日期:2024-03-05
  • 通讯作者: 程耀辉(1997-),女,辽宁凤城人,硕士,主要从事煤矸石混凝土力学特性及耐久性研究。E-mail:cyhddfc@126.com
  • 作者简介:李永靖(1976-),男,山东烟台人,教授,博士,主要从事土木工程新材料研究。E-mail:lyjsdyt@126.com
  • 基金资助:
    国家自然科学基金项目(51974146, 52174078)

Revealing the Impact of Coal Gangue on Fracture Damage Characteristics of Concrete Based on Weibull Distribution

LI Yong-jing1,2,3, CHENG Yao-hui1, WEN Cheng-zhang1, HU Shuo1, SHANG Yun-zhi1, SONG Yang4   

  1. 1. College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China;
    2. Liaoning ProvincialKey Laboratory of Coal Gangue Resource Utilization and Energy-saving Building Materials, Liaoning Technical University,Fuxin 123000, China;
    3. College of Civil Engineering and Architectural,Shandong Business Institute, Yantai 264670, China;
    4. College of Architecture and Communications, Liaoning Technical University, Fuxin 123000, China
  • Received:2022-10-10 Revised:2022-12-25 Published:2024-03-01 Online:2024-03-05

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摘要： 为探索煤矸石质量取代率、粉煤灰质量取代率、水灰比对I型裂缝煤矸石混凝土荷载-裂缝张开位移、荷载-跨中挠度曲线、断裂韧性、断裂能的影响规律,对I型裂缝煤矸石混凝土进行三点弯曲试验,将所得结果结合损伤力学及Weibull分布函数建立煤矸石混凝土的断裂损伤本构模型。结果表明:煤矸石质量取代率对预制I型裂缝的煤矸石混凝土断裂性能影响最大,粉煤灰质量取代率对其断裂韧度影响较大,水灰比对其断裂能影响较大;提升煤矸石混凝土断裂时断裂韧度及断裂能的最佳组合的煤矸石质量取代率为25%、粉煤灰质量取代率为10%、水灰比为0.5;经对比可知,所得损伤本构模型对应的应力-应变曲线与试验曲线高度吻合。研究成果为煤矸石混凝土的制备及工程实际应用研究提供了参考。

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

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 function 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 concrete 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 valuable insights for the formulation and practical application of gangue concrete.

Key words: coal gangue concrete, orthogonal test, fracture toughness, fracture energy, Weibull distribution, damage constitutive model

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