石粉含量不同时掺杂S105级矿粉对水泥基材料性能的影响

Effect of Mixed S105 Slag Powder on Performance of Cement-Based Materials under Different Stone Powder Content

为了改善高强机制砂混凝土的工作性能并提高其抗压强度,通过比强度法以及活性效应强度贡献率,直观描述了S105级矿粉掺量变化对水泥基材料的强度贡献大小,并基于机制砂中不同石粉含量下单掺S105级矿粉和机制砂中石粉含量不变时双掺S105级矿粉与不同掺合料的试验进行分析。结果表明,S105级矿粉掺量的增加对水泥基材料的活性效应强度贡献率有着积极的促进作用。机制砂中石粉含量为6%时,C80机制砂混凝土工作性能及强度效果最佳,增加石粉含量会使混凝土工作性能变差,强度有所下降。同单掺S105级矿粉相比,双掺S105级矿粉与微珠时早期强度先增大后减小,双掺S105级矿粉与硅灰时早期强度减小,两者28 d抗压强度最大增幅分别为11.5%、14.2%,60 d抗压强度最大增幅分别为8.6%、10.7%。此外,S105级矿粉与超细矿粉双掺可能会出现混凝土强度倒缩现象。

In order to improve the performance of manufactured sand concrete with high strength and improve its compressive strength,through the specific strength method and the contribution rate of the active effect intensity,the contribution of the strength of the cement-based materials to the change of the S105 slag powder content is intuitively described,and based on the tests of single-mixed S105 slag powder under different stone powder content in the manufactured sand and the tests of double-mixed S105 slag powder and different admixtures when the content of stone powder in the manufactured sand are constant.The results show that the increase of S105 slag powder content has a positive effect on the active effect intensity contribution rate of c ement-based materials.When the stone powder content in the manufactured sand is 6%,the C80 manufactured sand concrete has the best workability and strength effect,increasing the stone powder content makes the concrete workability worse and the strength decreases.Compared with single-mixed S105 slag powder,when double-mixed S105 slag powder and microbeads,the early strength first increases and then decreases,when double-mixed S105 slag powder and silica fume,the early strength decreases,the maximum increase of 28 d compressive strength is 11.5%and 14.2%respectively,the maximum increase of 60 d compressive strength is 8.6%and 10.7%respectively.In addition,double-mixed S105 slag powder and ultra-fine powder may cause the concrete strength to shrink.