摘要
以活化后的拜耳法赤泥和矿粉为原料,按照70∶30的配比制备胶砂试件,研究了赤泥的活化方式及养护方式对赤泥-矿粉复合材料力学性能、水化产物及微观结构的影响。结果表明,在相同的养护制度下,800℃高温煅烧后的赤泥制成的试件强度比105℃直接干燥后的赤泥制成的试件强度高约20%,其密实度更高。在相同活化方式下,60℃热固化24 h后在20℃环境下覆膜养护的试件3 d抗压强度最高,但是会产生较为明显的裂缝,随着养护时间的延长,强度降低;标准养护制度下试件28 d抗压强度最高。
Using activated Bayer red mud and mineral powder as raw materials,mortar specimen were prepared by mixing red mud and mineral powder in a ratio of 70∶30.The study focused on the influence of activation methods of red mud and curing methods on the mechanical strength,reaction products,and microstructure of red mud-mineral powder composite materials.The results showed that under the same curing method,the mechanical strength of the specimens made from the calcined red mud at 800℃was about 20%higher than that of the specimens made from the red mud treated by direct drying at 105℃,with a higher degree of compactness.Under the same activation method,the specimen cured by heat curing at 60℃for 24 h followed by membrane curing at 20℃had the highest compressive strength at 3 d,but the specimen produced more obvious cracks,resulting in a decrease in strength of the specimens as the curing time increased,and the specimen under the standard curing method had the highest compressive strength at 28 d.
作者
刘倬
周国印
孔晓光
刘康
董坤
于海洋
徐程
LIU Zhuo;ZHOU Guoyin;KONG Xiaoguang;LIU Kang;DONG Kun;YU Haiyang;XU Cheng(School of College Engineering,Ocean University of China,Qingdao 266500,China;Shandong High-speed High-tech Investment Co.Ltd.,Ji'nan 250101,China;Shandong High-speed Geotechnical Technology Co.Ltd.,Ji'nan 250100,China)
出处
《新型建筑材料》
2024年第3期6-10,23,共6页
New Building Materials
基金
国家自然科学基金面上项目(52279115)
山东高速集团委托科研项目(YTKJ-JSZX20211115-01)。
关键词
拜耳法赤泥
养护方式
高温活化
力学强度
反应产物
微观形貌
Bayer red mud
curing methods
high temperature activation
mechanical strength
reaction products
microstructure
