摘要
本文探究了采用细铁尾矿砂(FIOTS)代替石英砂(SS)制备高强碱激发砂浆(HAAM)的可能性。以粉煤灰和矿粉作为碱激发材料的前驱物,利用MTS万能试验机研究FIOTS/SS质量比及养护条件对粉煤灰-矿粉基HAAM基本力学性能的影响,结合X射线衍射(XRD)、电子扫描电镜(SEM)和能谱仪(EDS),揭示碱激发产物的微观物相组成、形貌特征及化学组成与宏观力学性能的关系。试验结果表明,随着FIOTS/SS质量比的增加,HAAM的抗压强度与劈裂强度逐渐降低。室内养护下HAAM的力学性能最高,其次是标准养护和水中养护,同时水中养护试件力学性能的降低程度随FIOTS替代率增加而更加显著。HAAM力学性能的降低主要由于FIOTS中的Fe元素抑制碱激发反应过程,并生成对力学性能无益的矿物相。
This paper explores the possibility of using fine iron tailings sand(FIOTS)instead of silica sand(SS)to prepare high-strength alkali-activated mortar(HAAM).Fly ash and slag were used as precursors of alkali-activated materials,the effects of FIOTS/SS mass ratio and curing conditions on the basic mechanical properties of fly ash-slag based HAAM were investigated using MTS universal testing machine,and X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy spectrometry(EDS)were used to reveal the relationship between microscopic phase composition,morphological characteristics and chemical composition of alkali-activated products and macroscopic mechanical properties.The test results show that the compressive strength and splitting strength of HAAM gradually decrease with the increase of FIOTS/SS mass ratio.The highest mechanical properties of HAAM under indoor curing are followed by those under standard curing and under water curing,while the reduction of mechanical properties of the specimens under water curing is more significant with the increase of FIOTS substitution rate.The reduction of mechanical properties of HAAM is mainly due to the inhibition of the alkali-excited reaction process by Fe element in FIOTS,and the formation of mineral phases which are not beneficial to the mechanical properties.
作者
王民
阎爽
李亚威
WANG Min;YAN Shuang;LI Yawei(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Beichen District Housing and Construction Commission of Tianjin,Tianjin 300499,China;China Municipal Engineering North China Design and Research Institute Co.,Ltd.,Tianjin 300381,China)
出处
《硅酸盐通报》
CAS
北大核心
2022年第6期2082-2089,2116,共9页
Bulletin of the Chinese Ceramic Society
关键词
粉煤灰-矿粉
高强碱激发砂浆
细铁尾矿砂
力学性能
养护条件
微观结构
fly ash-slag
high-strength alkali-activated mortar
fine iron ore tailings sand
mechanical property
curing condition
microstructure
