纤维素等若干因素对仿钢纤维增强透水混凝土性能的影响

Effects of Several Factors Such as Cellulose on the Properties of PolyethyleneFiber Reinforced Pervious Concrete

本实验研究了不同仿钢纤维掺量(0%、0.2%、0.4%、0.6%)对透水混凝土抗压强度和透水系数的影响,并分析了骨料粒径、细骨料、纤维素等因素对仿钢纤维增强透水混凝土抗压强度和透水性能的影响。研究表明:仿钢纤维能够在一定程度上提高透水混凝土的早期强度;随仿钢纤维掺量的增加,透水混凝土28 d的抗压强度呈先上升后下降趋势,即存在最优掺量;当仿钢纤维掺量增加时,透水混凝土的透水能力先下降后上升;透水混凝土的抗压强度随骨料粒径的增大而降低,透水系数随骨料粒径的增大而明显增大;细骨料会使透水混凝土的早期抗压强度降低,但会提高透水混凝土28 d的抗压强度;随着细骨料取代量的增加,透水混凝土的透水系数先增大后减小;透水混凝土的抗压强度随纤维素掺量的增加而降低,透水系数随纤维素掺量的增加而增大。本研究可为实际透水混凝土施工过程中外掺料的选择提供参考。

In this experiment,the effects of different steel fiber content(0%,0.2%,0.4%,0.6%)on the compressive strength and permeability coefficient of pervious concrete were studied.Furthermore,the influence of aggregate size,fine aggregate and cellulose on the compressive strength and permeability coefficient of polyethylene fiber reinforced pervious concrete were researched.The results show that the polyethylene fiber can partly improve the early compressive strength of pervious concrete.With the increase of the content of the polyethylene fiber,the compressive strength of pervious concrete in 28 d increases first and then decreases,that is to say,there is an optimal content.The permeability of pervious concrete decreases first and then increases with the increase of the content of polyethylene fiber.The compressive strength of pervious concrete decreases with the increase of aggregate size,and the permeability coefficient increases significantly with the increase of aggregate size.Fine aggregate will reduce the 7 d compressive strength of pervious concrete,but will increase the 28 d compressive strength.With the increase of fine aggregate,the permeability coefficient of pervious concrete increases first and then decreases.The compressive strength of pervious concrete decreases with the increase of cellulose content,and the permeability coefficient increases with the increase of cellulose content.The research can provide a reference for the selection of admixtures in the practical construction process of pervious concrete.