Research On The Experiments About Lime-steel Slag-Soil Is Used For Highway Sub-base

Steel slag is a kind of byproduct during steel-making, and it has much application in building engineering area, however, the application of steel slag in the road engineering is not very popular. This paper took the fine steel slag produced in the plant of Ma An Shan steel grouping for research subject, studing the pavement performance of mixture combined with lime, fine steel slag and soil as the mixture is used for highway sub-base. The steps which to ascertain the optimum mix of lime-steel slag-soil involve: 1)ascertaining the appropriate range of mass ratio between fine steel slag and soil. 2)ascertaining the optimum mass ratio between fine steel slag and soil through orthogonal experiment design method. 3)determining optimal mix of lime-steel slag-soil. According to the optimum mix of lime-steel-slag soil, we added respectively fine steel slag and steel slag micropowder to the mixture to test drying shrinkage and mechanical capacities, which include unconfined compressive strength, tensile splitting strength, modulus of compressive resilience. By comparative trial between the lime-steel slag-soil mixture and soil-lime mixture, some points are as follow:1.Using the unconfined compressive strength at different ages as check index, ascertain the optimal mass ratio between fine steel slag and soil is twenty to eighty.2.The unconfined compressive strength, tensile splitting strength, modulus of compressive resilience of lime-steel slag-soil increase with age's growth, and the values are greater than that of the soil-lime at same age. Each value of the mixture's mechanicial performances increase with the decrease of steel slag grain's size at late stage.3.By analyzing indexes of drying shrinkage on the lime-steel-slag-soil and soil-lime, the indexes contain drying shrinkage strain, average coefficiant of drying shrinkage, loss ratio of water, the conclusion is that the lime-steel slag-soil mixed fine steel slag has good performance at drying shrinkage, the mixture mixed steel slag micropowder taken second place, both all greater than soil-lime.