Study on the mechanical and shrinkage properties of magnesite tailings on cement mortar
In order to improve the phenomenon of severe shrinkage of commercial concrete,this paper studied the effects of the amount and fineness of magnesite tailings on the compressive strength,flexural strength,and shrinkage properties of cement mor-tar by adding magnesite tailings.The experimental results show that with the increase of the content of magnesite tailings,the com-pressive strength and flexural strength of cement mortar first increase and then decrease.The compressive strength at 28 days at 10％is 20.6％higher than that at 0％,and the flexural strength is 19.8％higher than that at 0％;The order of influence on the drying shrinkage of cement mortar is as follows:fineness of magnesite tailings＞content of magnesite tailings＞water cement ratio,water cement ratio is 0.35,mesh number of magnesite powder is 500,and the drying shrinkage is optimal when the content of magnesite is 9％.
万方数据
维普
