【摘要】 为探究高强高延性混凝土（high-strength and high-ductility concrete,HSHDC）的单轴拉伸性能，设计了12组试件进行了薄板单轴拉伸试验，研究了水胶比（0.14、0.16和0.18）、PE纤维体积率（1.5%、2.0%、2.5%）、纤维种类（PE和PVA）及PE纤维直径（22μm、35μm和40μm）对薄板单轴拉伸行为的影响.并利用峰值前应变能密度分析了上述因素对HSHDC能量吸收能力的影响.结果表明：随着水胶比的增大，HSHDC的抗拉强度呈先升高后降低的趋势，而极限拉伸应变呈增大趋势；HSHDC的抗拉强度随着纤维体积率的增加而增大，而HSHDC的极限拉伸应变在水胶比较小时随着纤维体积率的增加而减小，在水胶比较大时则相反；与0.14水胶比相比，在0.16和0.18水胶比下，HSHDC的峰值前应变能密度较大；与掺入PVA纤维的HSHDC试件相比，掺入PE纤维的HSHDC的拉伸性能和能量吸收能力更优，且小直径的PE纤维更适合制备HSHDC.最后，利用扫描电子显微镜（scanning electron microscope,SEM）研究了HSHDC致密的基体和粗糙的PE纤维表面.更多还原

【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 waterbinder 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).更多还原