循环流化床粉煤灰组成与含量对其水化胶凝性能的影响

摘要/Abstract

摘要： 循环流化床粉煤灰(CFBFA)的组成显著影响其水化胶凝性能,明晰组成和含量对其水化胶凝性能的影响规律有助于进一步阐明CFBFA水化胶凝机制。本文通过力学性能测试、X射线衍射分析、扫描电子显微镜-能谱分析方法,研究了CFBFA的组成与含量对其水化胶凝力学性能、物相组成、微观形貌和元素分布的影响。结果表明:不同组成CFBFA胶砂试块的水化胶凝性能具有差异性,主要与CFBFA中所含铝、硅、钙、硫等含量有关,当铝、硅质量分数超过75%时,CFBFA胶砂试块28 d抗压强度约为38 MPa,铝、硅含量高,有利于胶凝体系形成含水化硅酸钙的致密块体;当钙、硫质量分数超过28%时,CFBFA胶砂试块28 d抗压强度降至14.5 MPa左右,钙、硫含量较高会导致胶凝体系出现不利于强度发展的棒状钙矾石;随着水泥添加质量分数从50%增加到90%,CFBFA胶砂试块28 d抗压强度增加了27.2 MPa, CFBFA胶砂试块的力学性能与水泥添加量呈正相关,这是因为水泥不仅自身可发生水化反应并生成自硬性水化产物,而且能促进CFBFA中铝、硅组分的水化反应。该研究可为CFBFA在建筑材料领域的应用提供参考。

关键词: 循环流化床粉煤灰, 力学性能, 物相组成, 微观形貌, 元素分布

Abstract: The chemical composition of circulating fluidized bed fly ash (CFBFA) are significantly affected its hydrated cementitious properties. Based on the effects of composition and content on the hydrated cementitious properties for CFBFA, it is helpful to further clarify the hydrated cementitious mechanism of CFBFA. The effects of composition and content on the hydrated cementitious mechanical properties, phase composition, micro morphology and elemental distribution for CFBFA were investigated by mechanical properties testing, X-ray diffraction analysis and scanning electron microscopy-energy spectroscopy analysis. The results show that the hydrated cementitious properties are obviously different for CFBFA mortar test block with the different chemical compositions. When the mass contents of aluminum and silicon exceeds 75%, the 28 d compressive strength of CFBFA mortar test block is about 38 MPa. When the mass content of calcium and sulfur exceeds 28%, the 28 d compressive strength of CFBFA mortar test block decreases to about 14.5 MPa. The high content of aluminum and silicon are beneficial to the formation of dense blocks with the large percentage of hydrated calcium silicate, while the high content of calcium and sulfur will result in the appearance of rod-shaped calcium alumina, which is not conducive to the development of mechanical property. In addition, with the increase of cement mass fraction from 50% to 90%, the 28 d compressive strength of CFBFA mortar test block increases by 27.2 MPa. The compressive strength of CFBFA mortar test block is positively correlated with the additional amount of cement in hydrated cementitious system, due to the hydration effect of cement itself and its promoting effect on the reaction of CFBFA. This study can provide a theoretical guidance for the application of CFBFA in the field of construction materials.

Key words: CFBFA, mechanical property, phase composition, micro morphology, element distribution

中图分类号:

TQ536.4

燕可洲, 孙向阳, 张鑫泽, 温凯, 郭彦霞, 程芳琴. 循环流化床粉煤灰组成与含量对其水化胶凝性能的影响[J]. 硅酸盐通报, 2024, 43(2): 564-571.

YAN Kezhou, SUN Xiangyang, ZHANG Xinze, WEN Kai, GUO Yanxia, CHENG Fangqin. Effects of Composition and Content of CFBFA on Hydrated Cementitious Properties[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 564-571.

参考文献

[1] 芋艳梅, 刘永明. 固硫灰渣和粉煤灰的特性对比分析[J]. 水泥工程, 2021(4): 8-11.
YU Y M, LIU Y M. Properties analysis of sulfur-fixing ash and fly ash[J]. Cement Engineering, 2021(4): 8-11 (in Chinese).
[2] 宁美, 王智, 钱觉时, 等. 固硫灰渣的特性及其与现行标准的适应性[J]. 硅酸盐通报, 2019, 38(3): 688-693+701.
NING M, WANG Z, QIAN J S, et al. Characteristics of fluidized bed coal combustion fly ash and slag and its adaptability with current standards[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(3): 688-693+701 (in Chinese).
[3] 张乐, 胡广超, 燕可洲, 等. 低热值煤灰渣制备无机人造大理石及性能研究[J]. 新型建筑材料, 2023, 50(5): 68-73.
ZHANG L, HU G C, YAN K Z, et al. Preparation of inorganic artificial marble from low calorific value coal ashes and performance research[J]. New Building Materials, 2023, 50(5): 68-73 (in Chinese).
[4] 戴民, 王越. 循环流化床脱硫灰地聚物试验研究[J]. 硅酸盐通报, 2020, 39(9): 2898-2904+2918.
DAI M, WANG Y. Experimental study on circulating fluidized bed desulfurization ash geopolymer[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(9): 2898-2904+2918 (in Chinese).
[5] MEJEOUMOV G G, SHON C S, SAYLAK D, et al. Beneficiation of stockpiled fluidized bed coal ash in road base course construction[J]. Construction and Building Materials, 2010, 24(11): 2072-2078.
[6] JACKSON N M, SCHULTZ S, SANDER P, et al. Beneficial use of CFB ash in pavement construction applications[J]. Fuel, 2009, 88(7): 1210-1215.
[7] 朱文尚, 颜碧兰, 江丽珍. 循环流化床燃煤固硫灰渣研究利用现状[J]. 粉煤灰, 2011, 23(3): 25-26+33.
ZHU W S, YAN B L, JIANG L Z. Current situation on utilization of circulated fluidized bed combustion (CFBC) ashes[J]. Coal Ash, 2011, 23(3): 25-26+33 (in Chinese).
[8] 索贵有, 门建军, 杨国辉. 循环流化床锅炉粉煤灰渣综合利用探讨[J]. 煤炭工程, 2013, 45(6): 100-101+105.
SUO G Y, MEN J J, YANG G H. Discussion on comprehensive utilization of fly ash in circulating fluidized bed boiler[J]. Coal Engineering, 2013, 45(6): 100-101+105 (in Chinese).
[9] 戴民, 刘力澄, 黄尧, 等. 磨细循环流化床飞灰对水泥性能的影响[J]. 水泥, 2022(11): 1-5.
DAI M, LIU L C, HUANG Y, et al. Effect of grinding fly ash from circulating fluidized bed on cement properties[J]. Cement, 2022(11): 1-5 (in Chinese).
[10] 刘淑芳. 粉煤灰在新型建筑材料中的应用[J]. 辽宁工程技术大学学报(自然科学版), 2011, 30(S1): 57-59.
LIU S F. Application of fly ash in new style construction material[J]. Journal of Liaoning Technical University (Natural Science), 2011, 30(S1): 57-59 (in Chinese).
[11] 周明凯, 王宇强, 陈潇. CFB炉渣代机制砂对混凝土强度的影响机理[J]. 建筑材料学报, 2022, 25(12): 1241-1247.
ZHOU M K, WANG Y Q, CHEN X. Influence mechanism of CFB slag replacing machine-made sand on concrete strength[J]. Journal of Building Materials, 2022, 25(12): 1241-1247 (in Chinese).
[12] 王建科, 廖洪强, 段思宇, 等. 燃煤循环流化床锅炉灰、渣超微粉胶凝特性研究[J]. 环境工程, 2022, 40(8): 110-117.
WANG J K, LIAO H Q, DUAN S Y, et al. Study on gelatinization characteristics of superfine powder of ash and slag in coal-fired circulating fluidized bed boiler[J]. Environmental Engineering, 2022, 40(8): 110-117 (in Chinese).
[13] 姚源, 王敏, 张凯峰, 等. 循环流化床固硫灰与磨细灰渣用作混凝土掺合料的关键技术研究[J]. 新型建筑材料, 2020, 47(2): 88-91.
YAO Y, WANG M, ZHANG K F, et al. Study on key technology of circulating fluidized bed solid sulfur ash and ground ash used as concrete admixture[J]. New Building Materials, 2020, 47(2): 88-91 (in Chinese).
[14] 何宏舟, 过伟丽. 循环流化床锅炉炉内脱硫灰渣的水化特性研究[J]. 煤炭转化, 2010, 33(3): 72-75.
HE H Z, GUO W L. Study on the hydrating capacity of the desulfurization slag of cfb boiler[J]. Coal Conversion, 2010, 33(3): 72-75 (in Chinese).
[15] 付雅琴, 肖莲珍, 史文冲. 水泥-粉煤灰复合胶凝体系的早期水化性能[J]. 武汉工程大学学报, 2016, 38(2): 152-157.
FU Y Q, XIAO L Z, SHI W C. Early hydration properties of cement-fly ash cementitious system[J]. Journal of Wuhan Institute of Technology, 2016, 38(2): 152-157 (in Chinese).
[16] 任才富, 王栋民, 郑大鹏, 等. 掺超细循环流化床粉煤灰的水泥性能试验研究[J]. 矿业科学学报, 2016, 1(1): 96-102.
REN C F, WANG D M, ZHENG D P, et al. Experimental study on properties of cement mixed with ultrafine circulating fluidized bed fly ash[J]. Journal of Mining Science and Technology, 2016, 1(1): 96-102 (in Chinese).
[17] 夏艳晴, 严云, 胡志华, 等. 化学激发固硫灰的早期水化活性[J]. 武汉理工大学学报, 2012, 34(12): 9-13.
XIA Y Q, YAN Y, HU Z H, et al. Excitation of chemical activators on the hydrating of CFBC fly ash[J]. Journal of Wuhan University of Technology, 2012, 34(12): 9-13 (in Chinese).
[18] 符勇, 刘青山, 马学春. 脱硫石膏-粉煤灰基胶凝材料的特性研究[J]. 新型建筑材料, 2014, 41(12): 50-52.
FU Y, LIU Q S, MA X C. Study on the properties of FGD-fly ash-based cement[J]. New Building Materials, 2014, 41(12): 50-52 (in Chinese).
[19] 曾智源. 流化床灰石膏基复合胶凝材料及改性研究[D]. 重庆: 重庆交通大学, 2019.
ZENG Z Y. Study on fluidized bed lime gypsum-based composite cementitious material and its modification[D]. Chongqing: Chongqing Jiaotong University, 2019 (in Chinese).
[20] 施惠生, 方泽锋. 粉煤灰对水泥浆体早期水化和孔结构的影响[J]. 硅酸盐学报, 2004, 32(1): 95-98.
SHI H S, FANG Z F. Influence of fly ash on early hydration and pore structure of cement pastes[J]. Journal of the Chinese Ceramic Society, 2004, 32(1): 95-98 (in Chinese).
[21] 张烨, 马欣蕾, 李祖辉. 水泥-粉煤灰基胶凝材料配比优化试验研究[J]. 工程质量, 2022, 40(8): 29-34.
ZHANG Y, MA X L, LI Z H. Experimental study on optimization of the ratio of cement-fly ash-based cementitious materials[J]. Construction Quality, 2022, 40(8): 29-34 (in Chinese).
[22] POON C S, KOU S C, LAM L, et al. Activation of fly ash/cement systems using calcium sulfate anhydrite (CaSO₄)[J]. Cement and Concrete Research, 2001, 31(6): 873-881.
[23] 刘虎林, 王昭, 伍媛婷, 等. 固硫灰渣的基本特性及其作水泥混合材的关键问题研究进展[J]. 硅酸盐通报, 2021, 40(6): 2052-2061+2069.
LIU H L, WANG Z, WU Y T, et al. Review on characteristics of fluidized bed combustion ashes and key issues in their application as cement admixtures[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(6): 2052-2061+2069 (in Chinese).
[24] 赵文华, 崔锋, 刘鹏亮, 等. 粉煤灰-脱硫石膏充填材料性能及微观结构研究[J]. 中国矿业, 2022, 31(9): 132-138.
ZHAO W H, CUI F, LIU P L, et al. Study on properties and microstructure of fly ash-desulfurization gypsum filling material[J]. China Mining Magazine, 2022, 31(9): 132-138 (in Chinese).
[25] 刘仍光, 阎培渝. 水泥-矿渣复合胶凝材料中矿渣的水化特性[J]. 硅酸盐学报, 2012, 40(8): 1112-1118.
LIU R G, YAN P Y. Hydration characteristics of slag in cement-slag complex binder[J]. Journal of the Chinese Ceramic Society, 2012, 40(8): 1112-1118 (in Chinese).
[26] 王悠悠, 袁浩, 韩晴晴, 等. 激发剂对粉煤灰-钛石膏-电石渣体系的活化及作用机理[J]. 无机盐工业, 2022, 54(6): 115-119.
WANG Y Y, YUAN H, HAN Q Q, et al. Activation of activator on fly ash-titanium gypsum-calcium carbide slag system and its hydration mechanism[J]. Inorganic Chemicals Industry, 2022, 54(6): 115-119 (in Chinese).
[27] 孙国文, 汤青青, 张丽娟, 等. 大掺量粉煤灰早期活性激发及其作用机理[J]. 哈尔滨工程大学学报, 2019, 40(3): 540-547.
SUN G W, TANG Q Q, ZHANG L J, et al. Early activation effect and mechanism of high-volume fly ash[J]. Journal of Harbin Engineering University, 2019, 40(3): 540-547 (in Chinese).