钢渣-煤基固废可控低强度材料制备及热力学分析

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (7): 2344-2351.

钢渣-煤基固废可控低强度材料制备及热力学分析

卢明阳¹, 庞来学¹, 杨达¹, 宋迪¹, 张佳丽¹, 田晓峰¹, 张逸洋²

1.山东交通学院交通土建工程学院,济南 250357;
2.青岛科技大学化学与分子工程学院,青岛 266042

收稿日期:2022-03-06 修回日期:2022-04-07 出版日期:2022-07-15 发布日期:2022-08-01
通讯作者: 庞来学,博士,教授。E-mail:lxpang@sdjtu.edu.cn
作者简介:卢明阳(1998—),女,硕士研究生。主要从事碱激发固废胶凝材料的研究。E-mail:lmysdjt98@163.com
基金资助:
山东省自然科学基金(ZR2020ME231);山东省重点扶持区域引进急需紧缺人才项目计划(2021)

Preparation and Thermodynamic Analysis of Steel Slag-Coal Based Solid Waste Controllable Low-Strength Materials

LU Mingyang¹, PANG Laixue¹, YANG Da¹, SONG Di¹, ZHANG Jiali¹, TIAN Xiaofeng¹, ZHANG Yiyang²

1. College of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China;
2. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

Received:2022-03-06 Revised:2022-04-07 Online:2022-07-15 Published:2022-08-01

摘要/Abstract

摘要： 利用NaOH、Na₂SO₄协同碱激发煤矸石(CG)、钢渣(SS)、粉煤灰(FA)制备无水泥可控低强度材料(CLSM)。利用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)分析了CLSM的微观结构和相组成。结果表明,Ca/(Ca+Si)的摩尔比与材料的7 d、28 d无侧限抗压强度比值存在线性关系,当Ca/(Ca+Si)摩尔比大于0.407时,7 d即可达到28 d无侧限抗压强度的70%以上,该材料具有早强特性。当粉煤灰质量掺量在40%以下时,CLSM工作性(流动性)满足ACI规范要求,不同质量配比的SS/FA改变了CLSM体系中反应产物的相组成,产物中钙矾石与水化硅酸钙(C-S-H)凝胶的密实嵌合结构为材料力学性能提供了微观结构基础。最后,基于吉布斯自由能最小化方法,模拟了水化产物中两种晶型水化硅酸钙的生成量。

关键词: 可控低强度材料, 碱激发材料, 水化硅酸钙, 钙矾石, 热力学模型, 工业固废

Abstract: Cement-free controllable low strength material (CLSM) was prepared by coal gangue (CG), steel slag (SS) and fly ash (FA) under the condition of NaOH, Na₂SO₄ synergistic alkali-activation. The microstructure and phase composition of CLSM were analyzed by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) technique. The results show that there is a linear relationship between the molar ratio of Ca/(Ca+Si) and 7 d, 28 d unconfined compressive strength ratio. When the molar ratio of Ca/(Ca+Si) is greater than 0.407, the unconfined compressive strength of CLSM curing for 7 d can reach more than 70% of that of 28 d, which shows the material has early strength feature. When the fly ash is below 40% (mass fraction), the CLSM performance (flow ability) meets the requirements of ACI specification. The different mass proportions of SS/FA change the phase composition of the reaction products in the CLSM system, and the dense chimeric structures of ettringite and calcium silicate hydrate (C-S-H) gel provide the microstructure ground for mechanical properties. Finally, based on the Gibbs free energy minimization method, the amount of two crystal types of hydrated calcium silicate in the hydration products is simulated.

Key words: controlled low-strength material, alkali-activated material, C-S-H, ettringite, thermodynamics model, industrial solid waste

中图分类号:

TU528.59

卢明阳, 庞来学, 杨达, 宋迪, 张佳丽, 田晓峰, 张逸洋. 钢渣-煤基固废可控低强度材料制备及热力学分析[J]. 硅酸盐通报, 2022, 41(7): 2344-2351.

LU Mingyang, PANG Laixue, YANG Da, SONG Di, ZHANG Jiali, TIAN Xiaofeng, ZHANG Yiyang. Preparation and Thermodynamic Analysis of Steel Slag-Coal Based Solid Waste Controllable Low-Strength Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2344-2351.

参考文献

[1] ADSKA W S. Controlled low-strength materials (CLSM)[C]. Detroit: American Concrete Institute, 1994.
[2] AMERI F, SHOAEI P, ZAREEI S A, et al. Geopolymers vs. alkali-activated materials (AAMs): a comparative study on durability, microstructure, and resistance to elevated temperatures of lightweight mortars[J]. Construction and Building Materials, 2019, 222: 49-63.
[3] HWANHG C L, CHIANG C H, HUYNH T P, et al. Properties of alkali-activated controlled low-strength material produced with waste water treatment sludge, fly ash, and slag[J]. Construction and Building Materials, 2017, 135: 459-471.
[4] 朱浩泽,于峰泉,耿健,等.钛石膏基可控低强度材料强度及体积稳定性研究[J].硅酸盐通报,2021,40(11):3644-3653.
ZHU H Z, YU F Q, GENG J, et al. Strength and volume stability of controlled low-strength material based on titanium gypsum[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(11): 3644-3653 (in Chinese).
[5] 张雪松,俞然刚,陈金平,等.废弃输油管道充填用可控低强度材料性能研究[J].硅酸盐通报,2017,36(6):1823-1840.
ZHANG X S, YU R G, CHEN J P, et al. Properties of controlled low-strength materials using in waste oil pipeline[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(6): 1823-1840 (in Chinese).
[6] XIAO R, POLACZYK P, JIANG X, et al. Cementless controlled low-strength material (CLSM) based on waste glass powder and hydrated lime: synthesis, characterization and thermodynamic simulation[J]. Construction and Building Materials, 2021, 275: 122157.
[7] MANH D O, KANG G O, KIM Y S. Development of a new cementless binder for controlled low strength material (CLSM) using entirely by-products[J]. Construction and Building Materials, 2019, 206: 576-589.
[8] 卿三成,马丽萍,杨静,等.水玻璃激发下HBSS-PG-AC复合胶凝材料水化性能分析[J].硅酸盐通报,2021,40(12):4052-4060+4069.
QIN S C, MA L P, YANG J, et al. Analysis of hydration properties of HBSS-PG-AC composite cementitious materials excited by sodium silicate[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(12): 4052-4060+4069 (in Chinese).
[9] WANG G, WANG Y, GAO Z. Use of steel slag as a granular material: volume expansion prediction and usability criteria[J]. Journal of Hazardous Materials, 2010, 184(1/2/3): 555-560.
[10] 吕擎峰,王子帅,谷留杨,等.硫酸钠对碱激发粉煤灰基地质聚物的强度及微观结构的影响(英文)[J].Journal of Central South University,2020,27(6):1691-1702.
LV Q F, WANG Z S, GU L Y, et al.Effect of sodium sulfate on strength and microstructure of alkali-activated fly ash based geopolymer[J]. Journal of Central South University, 2020, 27(6): 1691-1702.
[11] DENG G, HE Y J, LU L N, et al. Evolution of aluminate hydrate phases in fly ash-cement system under the sulfate conditions[J]. Construction and Building Materials, 2020, 252: 119045.
[12] LOTHENBACH B, SCRIVENER K, HOOTON R D. Supplementary cementitious materials[J]. Cement and concrete research, 2011, 41(12): 1244-1256.
[13] 杨海霞,刘琼,翟晶,等.水泥水化C-S-H的力学性能计算研究[J].四川水泥,2019(1):3.
YANG H X, LIU Q, ZHAI J, et al. Mechanical performance of cement hydrated C-S-H[J]. Sichuan Cement, 2019(1): 3 (in Chinese).
[14] ZHEN G Y, ZHOU H Y, ZHAO T T, et al. Performance appraisal of controlled low-strength material using sewage sludge and refuse incineration bottom ash[J]. Chinese Journal of Chemical Engineering, 2012, 20(1): 80-88.
[15] 杨达,卢明阳,宋迪,等.地质聚合物水泥的研究进展[J].材料导报,2021,35(s1):644-649.
YANG D, LU M Y, SONG D, et al. Research progress of geopolymer cement[J]. Materials Reports, 2021, 35(s1): 644-649 (in Chinese).
[16] 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).
[17] 段思宇.钢渣-粉煤灰-脱硫石膏复合胶凝体系的反应机制及应用研究[D].太原:山西大学,2020.
DUAN S Y. Reaction mechanisms and application study of steel slag-fly ash-desulfurized gypsum composite cementitious system[D]. Taiyuan: Shanxi University, 2020 (in Chinese).
[18] ACHRAF H, KHADIR G E, YASSINE T, et al. Phosphogypsum and black steel slag as additives for ecological bentonite-based materials: microstructure and characterization[J]. Minerals, 2020, 10(12): 1067.
[19] ZOU F B, ZHANG M, HU C L, et al. Novel C-A-S-H/PCE nanocomposites: design, characterization and the effect on cement hydration[J]. Chemical Engineering Journal, 2021, 412: 128569.
[20] 周继凯,黄俊凯,林成欢.水化硅酸钙力学性能分子动力学模拟方法对比研究[J].科学技术与工程, 2015, 15(28):179-183.
ZHOU J K, HUANG J K, LIN C H. Comparison study of methods in molecular dynamics simulation on the mechanical properties of calcium silicate hydrate[J]. Science Technology and Engineering, 2015, 15(28): 179-183 (in Chinese).
[21] LOTHENBACH B, KULIK D A, MATSCHEI T, et al. Cemdata18: a chemical thermodynamic database for hydrated Portland cements and alkali-activated materials[J]. Cement and Concrete Research, 2019, 115: 472-506.