湖南大学学报（自然科学版）2025，Vol.52Issue(5)：118-127,10.DOI:10.16339/j.cnki.hdxbzkb.2025053
高强高延性混凝土单轴拉伸性能试验研究
Experimental Study on Uniaxial Tensile Properties of High-strength and High-ductility Concrete
摘要
Abstract
To investigate the uniaxial tensile properties of high-strength and high-ductility concrete,(HSHDC),12 groups of specimens were designed,and uniaxial tensile tests were carried out.The effects of water-binder ratio(0.14,0.16 and 0.18),PE fiber volume ratio(1.5%,2.0%and 2.5%),fiber types(PE and PVA),and PE fiber diameters(22 µm,35 µm and 40 µm)on the uniaxial tensile behavior of thin sheets were studied.The influence of the above factors on the energy absorption capacity of HSHDC was analyzed in terms of the strain energy density before the peak stress.The results show that with the increase of the water-binder ratio,the tensile strength of HSHDC increases first and then decreases,while the ultimate tensile strain increases.The tensile strength of HSHDC increases with the fiber volume ratio,while the ultimate tensile strain of HSHDC decreases with the increase of fiber volume ratio when the water-binder ratio is low,but not vice versa when the water-binder ratio is large.When the water-binder ratio of 0.16 and 0.18 occurs,the strain energy density of HSHDC before the peak is higher with different fiber volume ratios.Compared with the HSHDC specimen mixed with PVA fiber,the HSHDC mixed with PE fiber has better tensile properties and energy absorption capacity,and the PE fiber with a small diameter is more suitable for HSHDC preparation.Finally,the dense matrix of HSHDC and the rough surface of PE fiber were studied by scanning electron microscope(SEM).关键词
高延性混凝土/纤维直径/纤维体积率/抗拉强度/极限应变Key words
high-ductility concrete/fiber diameter/fiber volume ratio/tensile strength/ultimate strain分类
建筑与水利引用本文复制引用
邓明科,王一童,杨家盛,张阳玺..高强高延性混凝土单轴拉伸性能试验研究[J].湖南大学学报（自然科学版）,2025,52(5):118-127,10.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 Major Science and Technology Planing Peoject(20191522415KYPT015JC017) （20191522415KYPT015JC017）
