摘要
这是一篇陶瓷及复合材料领域的论文。为探索煤废料替代水泥进行混凝土制备的可行性,利用活性化处理的煤渣粉和煤矸石粉按照0、10%、20%、30%和40%的比例替代水泥进行混凝土试样的制备并对混凝土试样的坍落度、抗压和抗折强度进行测试,同时耐高温性能实验,结果证明:随着替代比的增加,坍落度、抗压强度和抗折强度均先增后减;煤废料的较优替代比为20%~30%。活化煤渣粉试样的早期强度增长率大;而活化煤矸石粉试样的长期强度增长率较大。当水灰比=0.45时,试样的抗压强度随着温度的升高先增后减,在100℃时达到极大值;当水灰比=0.5时,混凝土试样的抗压强度均随着温度的升高逐渐降低;活性煤渣粉试样界面区域的水合胶结构较最多,对照组次之,活化煤矸石粉试样较少。随着温度升高,试样表面的孔隙和裂缝明显增多且破坏面的破碎程度逐渐加剧。
This is an article in the field of ceramics and composites.To explore the feasibility of using coal waste to replace cement for concrete preparation,the activated coal slag powder and coal gangue powder were used to replace cement at a ratio of 0%,10%,20%,30%,and 40%to prepare concrete samples and prepare concrete samples.The slump,compressive strength,flexural strength and high-temperature performance were tested,and the results show that:as the substitution ratio increases,the slump,compressive strength and flexural strength all increase first and then decrease;The optimal substitution ratio is 20%~30%.The early strength growth rate of the activated coal slag powder sample is large;while the long-term strength growth rate of the activated coal gangue powder sample is large.When the water-cement ratio=0.45,the compressive strength of the sample increases first and then decreases with the increase of temperature,and reaches the maximum at 100℃;when the water-cement ratio=0.5,the compressive strength of the concrete sample increases with the temperature;the hydration cement structure in the interface area of the activated coal slag powder sample is the most,followed by the control group,and the activated coal gangue powder sample is the least.With the increase in temperature,the pores and cracks on the surface of the sample increased significantly and the degree of fracture of the damaged surface gradually increased.
作者
冯娜
崔自治
李永琴
袁飞
FENG Na;CUI Zizhi;LI Yongqin;YUAN Fei(School of Civil Engineering and Architecture,Yinchuan Institute of Energy,Yinchuan 750000,Ningxia,China;School of Civil and Water Conservancy Engineering,Ningxia University,Yinchuan 750021,Ningxia,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China;Shanxi Institute of Architecture and Technology,Taiyuan 030006,Shanxi,China)
出处
《矿产综合利用》
CAS
2024年第2期81-88,共8页
Multipurpose Utilization of Mineral Resources
基金
银川能源学院校级科研(2023-KY-Y-13)
宁夏回族自治区大学生创新创业训练计划项目“矿物成分改性混凝土的强度研究”。
关键词
陶瓷及复合材料
混凝土
煤废料
坍落度
强度
耐高温特性
Ceramics and composites
Concrete
Coal waste
Slump
Strength
High temperature resistance
