Experimental Study On The Strength And The Cracking Resistance At Early Ages Of High-performance Concrete Added With Lithium Slag And Steel Slag

The subject to the of lithium slag and steel slag as high-performance concrete mineral admixture highperformance concrete, water-cement ratio, lithium slag ash and steel slag concrete strength and early crackresistance, in order to determine the best water-cement ratio, the best lithium slag and steel slag as well asthe best lithium slag fineness. Concrete strength test3d,7d,28d,90d age compressive strength of concreteand28d age of coagulation concrete splitting tensile strength as the evaluation index.Knife Edge testwater-cement ratio, lithium slag ash, slag slag fineness of ash and lithium complex doped lithium slag, slaghigh performance concrete early plastic shrinkage cracking, cracking area maximum crack width per unitarea as the evaluation index. Concluded as follows:(1) Water-cement ratio is the main factor to influence of lithium slag late slag high performanceconcrete compressive strength and the early crack resistance. Within a certain range, lithium slag, the slaghigh performance concrete strength with the increase of water cement ratio decreases, the early crackresistance showed enhanced trend with the increase of water-cement ratio, determined by the testconcrete the best strength and the early crack resistance water cement ratio of0.27and0.35, respectively.(2) Lithium slag dosage within a certain range, the growth of the early strength of concretesignificantly, the experimentally determined lithium slag dosage10%(pre) is the best, lithium slag, slaghigh performance concrete early cracking performance overall trend gradually increased with increasinglithium slag dosage30%, by experiment to determine the best lithium slag dosage, comprehensive look atthe of lithium slag dosage in10%to30%.(3) Steel slag within a certain range, the test to determine the strength of steel slag and20%for the oflithium slag, steel slag, high-performance concrete early crack resistance testing to determine the best steelslag10%of consolidated its steel slag in10%to20%.(4) Under conditions of optimal water-cement ratio complex doped lithium slag, the compressivestrength after the age of high performance slag concrete28d and28d age are higher than conventionalconcrete and single-doped lithium slag concrete, complex doped growth of lithium slag, steel slag concretestrength and optimal.(5) Under the conditions of each water-cement ratio doped lithium slag doped slag and lithium slag,the steel slag Admixed concrete Early crack resistance are better than ordinary cement concrete, at the sametime, the total dosage is the same premise, complex doped lithium slag, slag early crack resistance ofhigh-performance concrete is superior to single-doped lithium slag and the single doped slag concrete.(6) Within a certain range, lithium slag, the slag high performance concrete early crack resistance withlithium slag than the increase in the surface area of the first increase to reduce the law by the test todetermine the best lithium slag fineness770m~2/kg.