摘要
Abstract
To investigate the influence of coal gas residue on the performance of magnesium phosphate cement,four groups of coal gas residue-magnesium phosphate cement composite specimens with different dosages were prepared and subjected to high-temperature treatment at 300℃,600℃,900℃and1 200℃respectively.The durability of the composite cement after high-temperature treatment was systematically studied.The test results show that the residue from coal gasification significantly improves the high-temperature resistance of magnesium phosphate cement.The compressive strength at different temperatures showed a trend of first increasing and then decreasing with the increase of dosage.At room temperature,the compressive strength of the 15%dosage group reached the peak of 63.40 MPa,which was 22.9%higher than that of the non-dosage group.At room temperature,the flexural strength of the 15%dosage group was 19.8%higher than that of the non-dosage group.After high-temperature treatment,the flexural strength generally declined.At 600℃,the loss rate of the 15%dosage group was 34.19%,and the abnormal rebound loss rate of the flexural strength at 1 200℃was only 23.01%.At 600℃,the mass loss rate of the 10%dosage group was 6.88%,while at 1 200℃,the loss rate of the 15%dosage group was 11.24%.The 20%dosage led to performance degradation due to interface weakening and pore connectivity.In conclusion,it is indicated that 15%is the optimal dosage,which can synergistically enhance mechanical properties and high-temperature stability.关键词
磷酸镁水泥/煤制气残渣/力学性能/耐久性能Key words
Magnesium phosphate cement/Coal gasification residue/Mechanical properties/Durability performance分类
建筑与水利
