细铁尾矿砂和养护条件对高强碱激发砂浆力学性能及微观结构的影响

摘要/Abstract

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。

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

Abstract: 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.

Key words: fly ash-slag, high-strength alkali-activated mortar, fine iron ore tailings sand, mechanical property, curing condition, microstructure

中图分类号:

TU528

王民, 阎爽, 李亚威. 细铁尾矿砂和养护条件对高强碱激发砂浆力学性能及微观结构的影响[J]. 硅酸盐通报, 2022, 41(6): 2082-2089.

WANG Min, YAN Shuang, LI Yawei. Effects of Fine Iron Ore Tailings Sand and Curing Conditions on Mechanical Properties and Microstructure of High-Strength Alkali-Activated Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(6): 2082-2089.

参考文献

[1] 朱绘美,张煜雯,迂晨,等.微波养护不同阶段碱激发粉煤灰胶凝材料(AAFA)的力学性能发展[J/OL].建筑材料学报,2021,1-12[2022-01-01]http://kns.cnki.net/kcms/detail/31.1764.TU.20210630.1818.008.html.
ZHU H, ZHANG Y W, YU C, et al. Development of mechanical properties of alkali activated fly ash cement-material (AAFA) in different stages of microwave curing[J/OL]. Journal of Building Materials, 2021, 1-12[2022-01-01]http://kns.cnki.net/kcms/detail/31.1764.TU.20210630.1818.008.html (in Chinese).
[2] 吴旻,谢胜华,葛根旺.碱激发钢渣矿渣复合基层材料的强度特性及微观机制[J].硅酸盐通报,2021,40(8):2640-2646.
WU M, XIE S H, GE G W. Strength chatacteristics and micro-mechanism of alkali-activated steel slag-blast furnace slag road base composite material[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(8): 2640-2646 (in Chinese).
[3] KAMSEU E, ALZARI V, NUVOLI D, et al. Dependence of the geopolymerization process and end-products to the nature of solid precursors: challenge of the sustainability[J]. Journal of Cleaner Production, 2021, 278: 123587.
[4] CHEN K Y, WU D Z, XIA L L, et al. Geopolymer concrete durability subjected to aggressive environments-a review of influence factors and comparison with ordinary Portland cement[J]. Construction and Building Materials, 2021, 279: 122496.
[5] GLASBY T, DAY J, GENRICH R, et al. EFC geopolymer concrete aircraft pavements at Brisbane West Wellcamp Airport [C]. Concrete Institute of Australia Conference, 2015, 1-9.
[6] 吕绍伟,姜屏,钱彪,等.铁尾矿砂力学特性及再生利用研究进展[J].硅酸盐通报,2020,39(2):466-470+512.
LYU S W, JIANG P, QIAN B, et al. Research progress on mechanical properties and recycling of iron tailings sand[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(2): 466-470+512 (in Chinese).
[7] SHETTIMA A U, HUSSIN M W, AHMAD Y, et al. Evaluation of iron ore tailings as replacement for fine aggregate in concrete[J]. Construction and Building Materials, 2016, 120: 72-79.
[8] KURANCHIE F A, SHUKLA S K, HABIBI D. Utilisation of iron ore mine tailings for the production of geopolymer bricks[J]. International Journal of Mining, Reclamation and Environment, 2016, 30(2): 92-114.
[9] KUMAR R, DAS P, BEULAH M, et al. Utilization of iron ore tailings for the production of fly ash—GGBS-based geopolymer bricks[J]. Journal of Advanced Manufacturing Systems, 2017, 16(3): 275-290.
[10] 卢佳涛,孔丽娟,樊子瑞,等.铁尾矿砂-地聚物复合材料界面与性能研究[J/OL].建筑材料学报,1-11[2022-01-01].https://kns.cnki.net/kcms/detail/31.1764.TU.20210616.1527.002.html.
LV J T, KONG L J, FAN Z R, et al. Study on interface and properties of iron tailing ore - terrestrial polymer composites[J/OL]. Journal of Building Materials, 1-11 [2022-01-01]. https://kns.cnki.net/kcms/detail/31.1764.TU.20210616.1527.002.html (in Chinese).
[11] 万磊,张智,宋华松,等.干湿循环对碱激发材料固化细铁尾矿砂强度特性的影响分析[J].硅酸盐通报,2020,39(7):2223-2231.
WAN L, ZHANG Z, SONG H S, et al. Effect of drying and wetting cycles on strength characteristic of alkali-activated materials solidified fine iron tailings sand[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(7): 2223-2231 (in Chinese).
[12] 李北星,陈梦义,王威,等.梯级粉磨制备铁尾矿-矿渣基胶凝材料[J].建筑材料学报,2014,17(2):206-211.
LI B X, CHEN M Y, WANG W, et al. Iron tailings-slag based cementitious materials prepared by cascade grinding[J]. Journal of Building Materials, 2014, 17(2): 206-211 (in Chinese).
[13] HASNAOUI A, GHORBEL E, WARDEH G. Effect of curing conditions on the performance of geopolymer concrete based on granulated blast furnace slag and metakaolin[J]. Journal of Materials in Civil Engineering, 2021, 33(3): 04020501.
[14] YOUSEFI ODERJI S, CHEN B, JAFFAR S T A. Effects of relative humidity on the properties of fly ash-based geopolymers[J]. Construction and Building Materials, 2017, 153: 268-273.
[15] KHAN M Z N, SHAIKH F U A, HAO Y F, et al. Effects of curing conditions and sand-to-binder ratios on compressive strength development of fly ash geopolymer[J]. Journal of Materials in Civil Engineering, 2018, 30(2): 04017267.
[16] 杨达,庞来学,宋迪,等.粉煤灰对碱激发矿渣/粉煤灰体系的作用机理研究[J].硅酸盐通报,2021,40(9):3005-3011.
YANG D, PANG L X, SONG D, et al. Reaction mechanism of fly ash in alkali-activated slag/fly ash system[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(9): 3005-3011 (in Chinese).
[17] 申艳军,白志鹏,郝建帅,等.尾矿制备混凝土研究进展与利用现状分析[J].硅酸盐通报,2021,40(3):845-857+876.
SHEN Y J, BAI Z P, HAO J S, et al. Research progress and utilization status analysis of concrete prepared by tailings[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(3): 845-857+876 (in Chinese).
[18] MA C, LONG G C, SHI Y, et al. Preparation of cleaner one-part geopolymer by investigating different types of commercial sodium metasilicate in China[J]. Journal of Cleaner Production, 2018, 201: 636-647.
[19] ASTM International. Standard test method for compressive strength of hydraulic cement mortars (using 2-in. or [50-mm] cube specimens): ASTM-C109[S]. America: ASTM International, 2016.
[20] 中华人民共和国建设部,国家质量监督检验检疫总局.普通混凝土力学性能试验方法标准:GB/T 50081—2002[S].北京:中国建筑工业出版社,2003.
Ministry of Construction of the People's Republic of China, General Administration of Quality Supervision, Inspection and Quarantine. Standard of test method for mechanical properties of ordinary concrete: GB/T 50081—2002[S]. Beijing: China Architecture and Architecture Press, 2003 (in Chinese).
[21] LONGHI M A, ZHANG Z H, RODRÍGUEZ E D, et al. Efflorescence of alkali-activated cements (geopolymers) and the impacts on material structures: a critical analysis[J]. Frontiers in Materials, 2019, 6: 89.
[22] CHOI S C, LEE W K. Effect of Fe₂O₃ on the physical property of geopolymer paste[J]. Advanced Materials Research, 2012, 586: 126-129.
[23] 童国庆,张吾渝,高义婷,等.碱激发粉煤灰地聚物的力学性能及微观机制研究[J].材料导报,2022,36(4):129-134.
TONG G Q, ZHANG W Y, GAO Y T, et al. Mechanical properties and micromechanism of alkali-activated fly ash geopolymer[J]. Materials Reports, 2022, 36(4): 129-134 (in Chinese).
[24] 刘洁.铁尾矿复合陶瓷的制备及远红外发射性能研究[D].天津:河北工业大学,2015.
LIU J. Preparation and far infrared emission properties of iron ore tailings composite ceramics[D]. Tianjin: Hebei University of Technology, 2015 (in Chinese).
[25] LI N, SHI C J, WANG Q, et al. Composition design and performance of alkali-activated cements[J]. Materials and Structures, 2017, 50(3): 178.
[26] 覃丽芳,曲波,史才军,等.钙硅比对铝硅酸盐凝胶形成与特性的影响[J].材料导报,2020,34(12):12057-12063.
QIN L F, QU B, SHI C J, et al. Effect of Ca/Si ratio on the formation and characteristics of synthetic aluminosilicate hydrate gels[J]. Materials Reports, 2020, 34(12): 12057-12063 (in Chinese).
[27] GARCIA-LODEIRO I, PALOMO A, FERNÁNDEZ-JIMNEZ A, et al. Compatibility studies between N-A-S-H and C-A-S-H gels. Study in the ternary diagram Na₂O-CaO-Al₂O₃-SiO₂-H₂O[J]. Cement and Concrete Research, 2011, 41(9): 923-931.