湖南大学学报（自然科学版）2024，Vol.51Issue(3)：130-140,11.DOI:10.16339/j.cnki.hdxbzkb.2024035
纤维特征参数对HES-HDC单轴拉伸性能的影响及拉伸韧性评价方法
Effect of Fiber Characteristics Parameters on Uniaxial Tensile Properties of HES-HDC and Evaluation Method of Tensile Toughness
摘要
Abstract
To investigate the uniaxial tensile mechanical properties of high-early-strength high ductility concrete(HES-HDC)at different PE fiber diameters and volume fractions,17 groups of thin-plate specimens were designed and loaded under uniaxial tensile tests.The effects of PE fiber diameters(22 μm and 25 μm)and fiber volume fractions(1.00%,1.25%,and 1.50%)on stress-strain curve,tensile strength,and strain of HES-HDC specimens at different curing ages(2 h,24 h,7 d,28 d and 56 d)were investigated.A tensile toughness evaluation method suitable for the characteristics of HDC was proposed based on the test results.The results show that the HES-HDC stress-strain curve exhibits strain-hardening characteristics under uniaxial tensile loading,and the failure process is carried out with multiple cracks.The tensile strength and strain of HES-HDC at 2 h reach over 3.29 MPa and 0.88%,respectively,and the tensile strain at 28 d could remain more than 1.28%.When the fiber volume fraction is 1.00%,small-diameter fiber is beneficial to the tensile strain of specimens,while large-diameter fiber is beneficial to the tensile strength of specimens.Considering the tensile strength and strain of specimens with large-diameter fiber,the optimal fiber volume fraction is 1.25%.The proposed tensile toughness evaluation method can evaluate the tensile toughness of HDC during its whole loading process.In addition,the tensile toughness index of HES-HDC decreased with the increase of curing age,while the tensile strength coefficient increased.The tensile toughness of specimens with small-diameter fiber is higher than that of specimens with large-diameter fiber.The tensile toughness of specimens is the highest when the fiber volume fraction is 1.25%.关键词
高早强高延性混凝土/纤维直径/纤维体积率/单轴拉伸/抗拉强度/拉伸韧性Key words
high-early-strength high ductility concrete/fiber diameter/fiber volume fraction/uniaxial tension/tensile strength/tensile toughness分类
建筑与水利引用本文复制引用
杨家盛,邓明科,张晴晴,邓友生,张阳玺,范洪侃..纤维特征参数对HES-HDC单轴拉伸性能的影响及拉伸韧性评价方法[J].湖南大学学报（自然科学版）,2024,51(3):130-140,11.基金项目
国家自然科学基金资助项目(51878545),National Natural Science Foundation of China(51878545) （51878545）
西安市重大科技创新计划项目(20191522415KYPT015JC017),Xi'an Science and Technology Bureau(20191522415KYPT015JC017) （20191522415KYPT015JC017）
