聚丙烯纤维对硅灰混凝土氯离子渗透性能的影响

在正交试验的基础上,采用NEL试验方法研究了不同掺量(体积掺量0.067%～0.5%)、不同尺度(3、6、10 mm)的聚丙烯纤维混杂对硅灰混凝土抗氯离子渗透性能的影响.研究表明,聚丙烯纤维影响硅灰混凝土抗氯离子渗透性能的因素依次为:长短纤维掺量比＞纤维掺量＞复合纤维长度.当纤维掺量在低掺量范围内增加时,硅灰混凝土氯离子渗透性能会降低,而当纤维掺量较高时,硅灰混凝土氯离子渗透性能反而增加;纤维对硅灰混凝土氯离子渗透性能的影响与复合纤维的长度关系不大,而与长短纤维掺量比关系密切.

Influence of hybrid polypropylene fibers on chloride ion permeability of silica fume concrete

Influence of hybrid polypropylene fibers on chloride ion permeability of silica fume concrete mixtures with variable design proportions were studied by NEL Method based on orthogonal experiment.Three fiber lengths:3mm,6mm and 10mm and fiber volume fractions ranged from 0.067% to 0.50% were considered.Results showed the influencing factors of permeability of silica fume concrete in order of decrease are as follows:long/short fibers mass ratio,fiber volume fraction,differential in length.When fiber volume fraction increased in a low range,the chloride ion permeability of silica fume decreased;when the volume fraction reached a high level,on the contrary,the permeability increased.Differential in length was less important but long/short fibers mass ratio was main factor to the chloride ion permeability of silica fume concrete.