基于正交试验的锂渣基可控低强度材料配合比研究

Mixture Ratio of Lithium Slag-Based Controllable Low Strength Materials Based on Orthogonal Experiment

本文以锂渣为主要原料,制备可控低强度材料(CLSM)。以单因素试验为基础,通过正交试验探索了水泥掺量、水胶比和减水剂掺量三个因素对锂渣基CLSM的抗折强度、抗压强度、流动度和泌水率的影响。研究表明,在大掺量锂渣的CLSM体系中,水胶比和减水剂掺量对材料流动性和泌水率具有显著影响,水泥掺量对泌水率几乎没有影响,提高水泥掺量会显著增加CLSM的抗压强度和抗折强度。对比各个因素对CLSM的影响,满足CLSM性能指标要求的胶凝材料适宜配合比为水泥掺量12%(质量分数,下同)、锂渣掺量88%、水胶比0.57、减水剂掺量0.20%。此时CLSM的流动度为231 mm,泌水率为1.49,28 d抗折强度可达1.74 MPa, 28 d抗压强度为4.90 MPa,各项指标优良。

In this paper,controlled low strength material(CLSM)was prepared from lithium slag.Based on the single factor test,the effects of cement content,water-binder ratio and water-reducing agent content on flexural strength,compressive strength,fluidity and bleeding rate of lithium slag-based CLSM were investigated by orthogonal test.The results show that the water-binder ratio and the amount of superplasticizer have significant effects on fluidity and bleeding rate of the materials.In CLSM system with large amount of lithium slag,the cement content has little effect on the bleeding rate,and increasing the cement content would increase the compressive strength and flexural strength of CLSM.Comparing the influence of various factors on CLSM,the suitable mix ratio to meet the requirements of CLSM performance index is as follows:cement content 12%(mass fraction,same below),lithium slag content 88%,water-binder ratio 0.57,water reducer content 0.20%.At this time,the fluidity of CLSM is 231 mm,the bleeding rate is 1.49,the 28 d flexural strength can reach 1.74 MPa,and the 28 d compressive strength is 4.90 MPa.All indicators are excellent.