Study on Key Technology of Preparing Cement Expansive Material From Lithium Slag
In this study,lithium slag cement expansive material was prepared.1#,2#lithium slag and sulfur aluminum cement clinker powder were prepared into cement expansive material according to different proportions.The effects of the amount of lithium slag and sulfur aluminum cement clinker powder on the limited expansion rate of cement expansive material were studied respectively;After determining the optimum dosage of sulfur aluminum cement clinker powder,the influence law of the dosage of 1#,2#lithium slag on the compressive strength of expan-sive agent at 7 and 28 days was studied,so as to determine the optimum proportion of lithium slag expansive agent.The test results show that the limited expansion rate of expansive agent decreases with the decrease of the dosage of sulfur aluminum cement clinker powder,increases first and then decreases with the increase of the dosage of 1#lithium slag,and the compressive strength of expansive agent decreases with the increase of the dosage of 1#lithium slag and the decrease of the dosage of 2#lithium slag;The optimum ratio of cement expansive material is 1#lithium slag∶2#lithium slag∶sulfur aluminum cement clinker powder=5∶5∶2.At this time,the limited expansion rates of lithium slag cement expansive material cured in water for 7 days and in air for 21 days are 0.039%,-0.01%respectively,and the compressive strength at 7 days and 28 days are 33.4 MPa and 55.4 MPa respectively.
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