Research Research On Performance Of Concrete With Compound Mineral Admixtures

As a much widespread material, concrete needs huge quantities of constructionmaterials and natural resources every year. It is a very promising goal to find the rightconcrete mixture ratio, make the concrete have a certain strenght and durability, and letthe concrete need a lower construction materials as well as make use of the industrialwaste.In this paper, based on the particle size distribution, two equation model wasdiscussed, the most closedest particle state is aimed to achieve, then reach the bestparticle mixture ratio and the compliance dosages of the slag cement, fly ash cementand the mixture contained varying amounts of slag, fly ash and cement. Then thefeasibility will be dicussed by means of D value and the compactness. The resultprovide a experiment basis for the followed.The experiment study shows that the two equation model is feasible, although theresults is different, the equations is relative. Through the research, it was found that theearly age strengh of concrete with mineral admixture grow slowly, the compressivestrength of the3d is about23.6%lower than the reference concrete, while thecompressive strengh at56d is about the same. The mineral admixture have a greatimpact on concrete durability, the shrinkage of concrete with mineral admixture is lessthan the reference concrete and the shrinkage plateau stage is in advance. At56d, thereference concrete is still of a relative high shrinkage growth while the concrete withmineral admixture is of a relative stable shinkage growth. The impermeability ofconcreate with mineral admixture is better than the reference concrete. At28d, theelectric flux method of the reference concrete is about43%higher than concrete K1with30%mineral admixture, that suggests the slag have a significant contribution toconcrete impermeability. The result of concrete ring test shows that: at56d, there is stillno complete crack in concrete with mineral admixture, it suggests that the anti-crackingperformance of concrete with mineral asmixture is better.