铁尾砂泡沫混凝土的制备及性能  

Preparation and Properties of Foamed Concrete with Iron Tailings Sand

作　　者：朱利平 杜晓丽[1] 邹天民 ZHU Liping;DU Xiaoli;ZOU Tianmin(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《安徽工业大学学报（自然科学版）》2024年第1期81-86,共6页Journal of Anhui University of Technology（Natural Science）

基　　金：国家自然科学基金项目(52074005)。

摘　　要：以铁尾砂为细骨料,采用不同掺量的铁尾砂取代天然砂制备目标密度为900 kg/m~3的铁尾砂泡沫混凝土试件,分析铁尾砂掺量对试件干燥收缩率、吸水率、导热系数、抗压强度、劈裂抗拉强度等性能的影响;并采用扫描电镜及图象分析软件分析试件的微观形貌。结果表明:铁尾砂掺量(质量分数)在0~40%范围内,随铁尾砂掺量的增加,泡沫混凝土的干燥收缩率和吸水率下降,导热系数略有增加;泡沫混凝土的抗压强度和劈裂抗拉强度呈先增后减的趋势,铁尾砂掺量20%时抗压和劈裂抗拉强度最高;掺入适量的铁尾砂可改善泡沫混凝土的孔结构,内部孔径趋向均匀,铁尾砂质量分数超过20%时泡沫混凝土的微观结构劣化,这也是导致其力学性能开始下降的原因。Iron tailings sand was used as fine aggregate,and different dosages of iron tailings sand were used to replace natural sand to prepare foam concrete specimens with a target density of 900 kg/m3,and the effects of iron tailings sand dosage on the specimens’properties such as drying shrinkage,water absorption,thermal conductivity,compressive strength and splitting tensile strength were analyzed;and scanning electron microscope and graphic analyzing software were also used to analyze the microscopic morphology of the specimens.The results show that the iron tailings sand mixing(mass fraction)in the range of 0–40%,with the increase of iron tailings sand mixing,the drying shrinkage and water absorption of foam concrete decreases,the thermal conductivity increases slightly.The foam concrete compressive strength and splitting tensile strength show a trend of increasing first and then decreasing,and the highest compressive and splitting tensile strength is observed when iron tail sand mixing is 20%.The pore structure of foam concrete can be improved by adding appropriate amount of iron tailings sand,and the internal pore size tends to be uniform,and the microstructure of foam concrete deteriorates when the mass fraction of iron tailings sand is more than 20%,which is also the reason why its mechanical properties begin to decline.

关 键 词：泡沫混凝土 铁尾砂 抗压强度 干燥收缩率 导热系数 

分 类 号：TU528[建筑科学—建筑技术科学]