The Long-term Performance Test Research Of The Polypropylene Fibre Self-compacting Concrete

Because of the advantage that the self-compacting concrete has a better flow characteristic,it makes the self-compacting concrete widely used in engineering practice as a kind of high performance concrete.It can effectively change the brittleness of concrete when the polypropylene fibre is mixed in the self-compacting concrete,the polypropylene fibre self-compacting concrete can also make a better damage form of the concrete than the normal one after the compression test.At the same time,the study of its mechanical properties also found that the addition of fiber in the self-compacting concrete can make the splitting tensile strength and flexural strength have an obvious enhancing effect.However,it is seldom about the long-term performance test research that the polypropylene fibre self-compacting concrete such as the shrinkage and creep of the concrete and the concrete’s fatigue life.Because of the concrete has a high performance,it will be wildly used in the engineering practice in the future.The lack of the polypropylene fibre self-compacting concrete’s long-term performance text,such as its shrinkage and creep,fatigue life and other tests,hinders the concrete’s used,in order to provide a valuable experimental basis and theoretical research in the future’s design,the polypropylene fibre self-compacting concrete’s long-term performance will be texted in this article,the article includes the following contents:Firstly,the reference makes the prism compression testing about the polypropylene fibre self-compacting concrete and the self-compacting concrete.On the basis of the standard for text methods of long term performance and durability of ordinary concrete,five kinds of curing period self-compacting concrete’s shrinkage and creep text will be experimented,the studies have founded the two kinds of self-compacting concrete’s shrinkage and creep data,compared the creep coefficient in different ages,the results show that the polypropylene fibre self-compacting concrete’s ability of the shrinkage and creep is Significantly increased.Secondly,the ANSYS can simulate two kinds of the self-compacting concrete’s strain changes at the age of 28 days and make sure that the creep experiment statics’ s accuracy.In addition to,Compared two kinds of the self-compacting concrete’s strain changes who had been loaded 28 days.The results show that the two kinds of the self-compacting concrete’s strain changes are close to the experiment results,then make a analysis about the self-compacting concrete has a relatively small results.Finally,experimently researched the two kinds of the self-compacting concrete beam’s fatigue property.By the two kinds of the Self-compacting concrete in different stress standard’s bending fatigue test life,analyze their qualitative analysis,it shows that after considering a degree of dispersion of the concrete,the polypropylene fibre self-compacting concrete’s fatigue life is longer than the self-compacting concrete,with the degree of the stress’ s increasing,the polypropylene fibre’s effect on the concrete’s fatigue life is significantly increased.With the help of the Two-Parameter Weibull distribution to probability analysis the self-compacting concrete’s fatigue life,the analysis shows the two kinds of concrete under the different stress standard’s P-N chart and after introduced the probability of failure’s S-N chart and P-S-N chart,these charts show that under the Two-Parameter Weibull distribution,the polypropylene fibre self-compacting concrete’s equivalent fatigue life is longer than the self-compacting concrete.