Experimental Research On The Performance Of Flyash And Slag Powder Concrete

This paper choose the mix proportion of concrete by orthogonal test method and studythe influence that fly ash and slag powder of single doped, double doped on the basicmechanical properties and durability of concrete. The experiment includes: make225specimens of100mm×100mm×400mm and900specimens of100mm×100mm×100mm tomeasure the flexural strength, compressive strength, make225standard cylindricalspecimens having a diameter of100mm, a height of50mm,900specimens of100mm×100mm×100mm,225specimens of100mm×100mm×400mm,375specimens of150mm×150mm×150mm to measure the resistance to chloride ion permeability,carbonation resistance, freeze-thaw resistance and abrasion resistance.The results show: fly ash of single doped adversely affects the early strength ofconcrete, judging from the performance comparison of different dosage groups, thereplacement of fly ash amount should not exceed30%; the adverse effects of single dopedslag powder on the early strength of concrete is far less than the fly ash and later strengthcan be increased, slag powder content of less than50%can significantly enhance thedurability of concrete. Double doping volcano fly ash and slag can make full use of fly asheffect and the spherical particles effect, making the concrete structure more compact andstable after28d; the use of slag powder makes up for the strength defects caused by theextensive use of fly ash and ensures the durability. In this paper, the resulting compositeadmixture biggest substitution rate for total cementitious materials is50%, fly ash and slagpowder ratio should be4:6. At this time, the3d compressive strength of concrete is40%asthe reference one, the90d data is85%;90d flexural strength is106%as the reference one;chloride ion penetration volume decreased by51%;28d carbonization depth is3.6times asthe reference one; freeze-thaw cycles increases50times; abrasion resistance is83%as thereference one.The completed research can not only reduce the cost of production of compositecement, but also can greatly improve the using rate of fly ash and slag powder in baotouerdos area, all this have very important value for the conservation of natural resources andenergy, protect environment, and emission reduction.