聚丙烯纤维对陶粒混凝土强度及抗氯离子渗透的影响

Experimentalstudy on the effect of polypropylene fiber on strength andresistance to chloride ion penetration of ceramsite concrete

掺加聚丙烯纤维后,陶粒混凝土的结构及孔隙都会改变,其强度和抗氯离子渗透性能也随之改变,对其开展深入研究可促进大规模推广应用。基于水胶比、粉煤灰掺量、减水剂剂量三个影响因素的正交试验,以抗压强度和劈裂抗拉强度为评价指标,得到了陶粒混凝土的最优配合比。试验表明:随着聚丙烯纤维掺量增大,陶粒混凝土的劈裂抗拉强度逐步提升,但抗压强度逐步降低;聚丙烯纤维掺量较低时,增大掺量可提升陶粒混凝土的抗氯离子渗透性能,但掺量较大时增大掺量反而会削弱陶粒混凝土的抗氯离子渗透性能,掺量为1 kg/m^3时陶粒混凝土的抗氯离子渗透性能最优。

The structure and porosity in the ceramsite concrete will be changed when added polypropylene fiber in it,and then its strength and resistance to chloride ion permeability will also be improved.In this way,to carry out intensive study can promote large-scale application.Based on the orthogonal tests of three influencing factors such as water-binder ratio,fly ash content and dosage of water reducing agent,the optimum mix ratio of ceramsite concrete is obtained by taking compressive strength and splitting tensile strength as evaluation index.The experimental results have shown that the splitting tensile strength of ceramsite concrete gradually increases as polypropylene fiber content rises,but the compressive strength gradually decreases.When the content of polypropylene fiber is low,the increase in polypropylene fiber content can enhance the resistance to chloride ion penetration of ceramsite concrete;however,the larger content of polypropylene fiber can weaken the resistance to chloride ion penetration of ceramsite concrete.When the content of polypropylene fiber reaches to 1Kg/m^3,the resistance to chloride ion permeability of ceramsite concrete would be optimum.