Study on Low Heat Steel Slag and Blast Furnace Slag Portland Cement( I) : Cement Performance with Its Proportion

Using clinker,steel slag,blast furnace slag and gypsum powder low heat steel slag and blast furnace slag Portland cement was prepared,and the influence of steel slag and blast furnace slag content on the various performance of the cement was characterized by the two-dimensional contour. The results show that steel slag reduces water demand for cement paste with normal consistence,and blast furnace slag increases it. They both delay initial and final setting time of cement,effect of steel slag delay larger than blast furnace slag cement. The strength of cement decreases with steel slag content addition. Effect of blast furnace slag content on strength increases with blast furnace slag content addition first,then it decreases with blast furnace slag content addition,blast furnace slag content exists a optimum value.Blast furnace slag on the mechanical strength enhancement effect is that final strength is greater than early strength,and flexural strength is greater than compressive strength. Replacing Portland clinker with steel slag or blast furnace slag can significantly reduce the cement early hydration heat,the value of reducing the early hydration heat of steel slag substituting clinker is 1. 5 times to an equal amount of blast furnace slag substituting clinker. The effect of lowering the early hydration heat of double-doped admixtures is higher than single-doped admixture.