摘要
为揭示水玻璃模数、粉煤灰掺量、水灰比和养护条件与碱矿渣混凝土力学性能及透水性能的关联规律,研究采用铁尾矿微粉、水泥、矿渣和粉煤灰为原料制备胶凝材料,以不同模数水玻璃作为碱激发剂制备碱矿渣混凝土。试验结果表明:水玻璃模数从1.0增加至1.5的过程中,碱矿渣混凝土力学性能呈先上升后降低的趋势,透水系数波动幅度较小,表现为先缓慢降低后轻微上升的趋势,水玻璃模数为1.2是其性能变化的拐点;粉煤灰掺量与碱矿渣混凝土力学性能整体呈负相关;随着水灰比的不断增大,碱矿渣混凝土力学性能先增大后减小,透水系数呈线性下降趋势;养护温度和养护湿度是决定碱矿渣混凝土力学性能发展的关键因素,不同养护条件下碱矿渣混凝土3 d和7 d抗压强度排序为蒸汽养护ZC>蒸养后潮湿养护HC>套袋密封养护MC>标准养护SC>恒温水中养护WC>室内养护NC,28 d抗压强度排序为HC>MC>SC>ZC>WC>NC。
In order to reveal the correlation laws among water glass modulus,fly ash amount,watercement ratio and curing conditions with mechanical properties and water permeability of alkali slag concrete,the iron tailings powder,cement,slag and fly ash were used as raw materials to prepare cementitious materials,and water glass with different modulus was used as alkali exciter to prepare alkali slag concrete.The experimental results are concluded as follows.Firstly,when the sodium silicate modulus is increased from 1.0 to 1.5,the mechanical properties of alkali slag concrete increases first and then decreases,and the permeability coefficient fluctuates less,showing a slow decrease and then a slight increase.The water glass modulus of 1.2 is the inflection point of its performance change.Secondly,the amount of fly ash is negatively correlated with the overall mechanical properties of alkali slag concrete.Thirdly,as the watercement ratio increases,the mechanical properties of alkali slag concrete increases first and then decrease,and the water permeability coefficient is linearly decreasing.Finally,the curing temperature and curing humidity are the key factors to determine the development of mechanical properties of alkali slag concrete.The compressive strength of alkali slag concrete at 3 d and 7 d under different curing conditions is ordered as ZC(steam curing)>HC(moist curing after steam curing),MC(Bagging seal curing)>SC(standard curing)>WC(water curing at constant temperature)>NC(indoor curing),while the compressive strength at 28 d is ranked as HC>MC>SC>ZC>WC>NC.
作者
武志勇
邢燕
朱峰
王飞宏
WU Zhiyong;XING Yan;ZHU Feng;WANG Feihong(Inner Mongolia Technical College of Mechanics and Electrics,Hohhot,Inner Mogolia 010070,China;Inner Mongolia Dinglve Architectural Decoration Co.,Ltd.,Hohhot,Inner Mogolia 010020,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,Zhengzhou,Henan 450006,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第5期149-154,共6页
Mining Research and Development
基金
国家自然科学基金项目(51974192)。
关键词
掺铁尾矿
碱矿渣混凝土
水玻璃
养护条件
力学性能
透水性能
Iron tailings
Alkali slag concrete
Sodium silicate
Curing condition
Mechanical property
Permeable performance
