矿物掺合料及纳米SiO_(2)对煤矸石混凝土基本性能影响研究  

Study on influence of mineral admixtures and nano-SiO_(2)on properties of coal gangue concrete

作　　者：常小龙 王玲玲[1] CHANG Xiaolong;WANG Lingling(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168)

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《中国建材科技》2025年第1期13-17,37,共6页China Building Materials Science & Technology

摘　　要：采用粒径4.75~25mm的煤矸石粗骨料进行纳米SiO_(2)溶液强化处理,将其制备成替代率为30%的煤矸石混凝土,并掺加不同替代率的矿粉和粉煤灰,研究其对煤矸石混凝土抗压强度和抗冻性能影响。研究发现,1.5%浓度纳米SiO_(2)溶液对煤矸石吸水率、压碎指标的强化效果最好,较普通煤矸石粗骨料压碎指标降低22%,吸水率降低13%。强化后的煤矸石混凝土较未强化抗压强度提高约8%,约为天然碎石混凝土抗压强度的92%。矿物掺合料中,矿粉对煤矸石混凝土抗压强度和抗冻性能提升较大;复掺时,矿粉掺量为20%、粉煤灰掺量为10%,此时煤矸石混凝土28d抗压强度和抗冻性能最好。The coarse aggregate of coal gangue with particle size of 4.75~25mm is strengthened with nano-SiO_(2)solution to prepare coal gangue concrete with replacement rate of 30%,and the effect of different replacement rates of mineral powder and fly ash on the compressive strength and anti-freezing performance of coal gangue concrete is studied.It is found that 1.5%concentration of nano-SiO_(2)solution has the best effect on the water absorption and crushing index of coal gangue,which can reduce the crushing index of ordinary coal gangue coarse aggregate by 22%and water absorption by 13%.The compressive strength of the strengthened coal gangue concrete is about 8%higher than that of the unstrengthened coal gangue concrete,which is about 92%of the compressive strength of natural crushed concrete.Among the mineral admixtures,mineral powder can greatly improve the compressive strength and frost resistance of coal gangue concrete.The 28 day compressive strength and anti-freezing performance of coal gangue concrete are the best when the content of mineral powder is 20%and fly ash is 10%.

关 键 词：矿物掺和料 煤矸石混凝土 纳米SiO_(2) 

分 类 号：TU528[建筑科学—建筑技术科学]