微波焙烧活化煤矸石改善混凝土抗硫酸盐侵蚀性能的研究

doi:10.19964/j.issn.1006-4990.2024-0018

Abstract

Abstract:

High-temperature calcination can stimulate the volcanic ash activity of coal gangue，but conventional kiln calcination process was blamed for high energy consumption and long time consumption.In this study，microwave roasting technology with characteristics of efficiency and energy-saving，was applied to improve the volcanic ash activity of coal gangue，and the influence of roasting temperature on phase composition and structure of coal gangue were investigated.In the meantime，the mechanism for improving the hydration characteristics and sulfate corrosion resistance of concrete products using activated coal gangue was explored，after characterizing the phase composition and structure of the hardened slurry after 28 d of curing and sulfate solution erosion with various period.The results indicated that the structure of kaolinite in coal gangue could be destroyed，which would be subsequently transformed into metakaolinite，thus endowing coal gangue with gel activity.After calcination at 700 ℃，the coal gangue contained 40.23% of soluble SiO₂ and 72.36% of soluble Al₂O₃of each.As a consequence，its 28 d volcanic ash activity index was increased to 80.27%.Activated coal gangue took part in the hydration reaction by absorbing Ca（OH）₂ in the slurry，thus promoting the generation of hydrated calcium silicate and hydrated calcium aluminate.Consequently，the amount of hydration products was increased.It not only improved the density and strength of the sample，but also suppressed the erosion damage of SO₄^2-.Because of the minimum amount of ettringite generated in the concrete sample with addition of 700 ℃ roasted coal gangue，the product showed the best resistance to sulfate attack.However，when the calcination temperature was increased to 900 ℃，some metakaolin transformed into anhydrous active mullite，and correspondingly，a decrease in sulfate resistance of the product was present.

Key words: coal gangue, microwave roasting, volcanic ash activity, concrete, sulfate resistance

CLC Number:

TQ127.2

MAO Shize. Study on microwave roasting-activated coal gangue to improve sulfate corrosion resistance of concrete[J]. Inorganic Chemicals Industry, 2025, 57(3): 86-93.

Figures/Tables 13

Table 1

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Table 2

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

References 18

1	刘昂，宫尧尧，高嵩，等.碳化和纳米SiO₂改性再生粗骨料混凝土抗硫酸盐侵蚀性能［J］.福州大学学报（自然科学版），2023，51（2）：256-263.
	LIU Ang， GONG Yaoyao， GAO Song，et al.Sulfate resistance of recycled concrete prepared with carbonation and nano SiO₂ modified recycled coarse aggregates［J］.Journal of Fuzhou University （Natural Science Edition），2023，51（2）：256-263.
2	MARDANI-AGHABAGLOU A， İNAN SEZER G， RAMYAR K.Comparison of fly ash，silica fume and metakaolin from mechanical properties and durability performance of mortar mixtures view point［J］.Construction and Building Materials，2014，70：17-25.
3	钟声亮，张迈生，苏锵.微波热法煅烧高岭土的机理研究［J］.中山大学学报（自然科学版），2005，44（3）：71-74.
	ZHONG Shengliang， ZHANG Maisheng， SU Qiang.Study of mecha-nism of Kaolin sintered by microwave heating［J］.Acta Scientiarum Naturalium Universitatis Sunyatseni，2005，44（3）：71-74.
4	朱绘美，张煜雯，迂晨，等.微波养护阶段碱激发粉煤灰胶凝材料的力学性能［J］.建筑材料学报，2022，25（6）：558-564.
	ZHU Huimei， ZHANG Yuwen， YU Chen，et al.Mechanical properties of alkali-activated fly ash cementitious materials under microwave curing stages［J］.Journal of Building Materials，2022，25（6）：558-564.
5	赵志曼，宋万明，董斌，等.微波辐照活化煤矸石-硅酸盐水泥体系试验研究［J］.材料导报，2011，25（S1）：474-476.
	ZHAO Zhiman， SONG Wanming， DONG Bin，et al.Effect of microwave radiation activation coal gangue to Portland cement system properties［J］.Materials Reports，2011，25（S1）：474-476.
6	王虹.土壤活性硅铝的测定与方法改进［J］.土壤通报，1986，17（3）：135-137.
	WANG Hong.Determination of active silicon and aluminum in soil and improvement of method［J］.Chinese Journal of Soil Science，1986，17（3）：135-137.
7	ASTERIS P G， LOURENÇO P B， ROUSSIS P C，et al.Revealing the nature of metakaolin-based concrete materials using artificial intelligence techniques［J］.Construction and Building Materials，2022，322：126500.
8	王磊，酒少武，成思萌，等.快速煅烧条件对煤系偏高岭土性能的影响［J］.材料科学与工程学报，2022，40（5）：791-795， 822.
	WANG Lei， Shaowu JIU， CHENG Simeng，et al.The effect of rapid calcination conditions on the properties of coal-series metakao-lin［J］.Journal of Materials Science and Engineering，2022，40（5）：791-795，822.
9	VENYITE P， MAKONE E C， KAZE R C，et al.Effect of combined metakaolin and basalt powder additions to laterite-based geopolymers activated by rice husk ash （RHA）/NaOH solution［J］.Silicon，2022，14（4）：1643-1662.
10	朱愿愿，王爱国，孙道胜，等.煅烧煤矸石细骨料特性及其对砂浆性能的提升作用［J］.煤炭学报，2021，46（11）：3657-3669.
	ZHU Yuanyuan， WANG Aiguo， SUN Daosheng，et al.Characteristics of coal gangue fine aggregates after calcination and its effects on the improvement of mortar properties［J］.Journal of China Coal Society，2021，46（11）：3657-3669.
11	WANG Aiguo， LIU Peng， LIU Kaiwei，et al.Application of air-cooled blast furnace slag aggregates as replacement of natural aggregates in cement-based materials：A study on water absorption property［J］.Journal of Wuhan University of Technology：Mater.Sci.Ed.，2018，33（2）：445-451.
12	WANG Qinghe， LI Zhe， ZHANG Yuzhuo，et al.Influence of coarse coal gangue aggregates on elastic modulus and drying shrinkage behaviour of concrete［J］.Journal of Building Engineering，2020，32：101748.
13	HAN Shiwen， ZHONG Jing， YU Qishen，et al.Sulfate resistance of eco-friendly and sulfate-resistant concrete using seawater sea-sand and high-ferrite Portland cement［J］.Construction and Bu-ilding Materials，2021，305：124753.
14	WRIGHT J W， PANTELIDES C P.Axial compression capacity of concrete columns reinforced with corrosion-resistant hybrid reinforcement［J］.Construction and Building Materials，2021，302：124209.
15	代凌辉，谢刚川，宫经伟.粉煤灰对低热水泥与普硅水泥早期水化影响对比研究［J］.混凝土，2023（2）：75-79，84.
	DAI Linghui， XIE Gangchuan， GONG Jingwei.Comparative
	study on the effect of fly ash on early hydration of low-heat cement and ordinary portland cement［J］.Concrete，2023（2）：75-79，84.
16	温勇，徐虎，韩东明.锂渣粉对水泥基材料抗硫酸盐侵蚀性能的影响［J］.混凝土，2010（12）：90-92.
	WEN Yong， XU Hu， HAN Dongming.Study on the effect of lithium slag powders upon the sulfate corrosion resistance of cement materials［J］.Concrete，2010（12）：90-92.
17	GADAG P R， GHORPADE V G， RAO H S.Durability study of nano influenced metakaolin concrete to acid attack［J］.Civil Engineering and Architecture，2022，10（3）：1012-1035.
18	DVORKIN L I， ZHITKOVSKY V， LUSHNIKOVA N，et al.Comparative study of metakaolin and zeolite tuff influence on properties of high-strength concrete［J］.Construction Technologies and Architecture，2022（15）：10042-10045.

原料	w （SiO₂）	w （Al₂O₃）	w （Fe₂O₃）	w （MgO）	w （CaO）
水泥	21.32	4.95	3.94	2.20	62.67
煤矸石	58.69	18.56	8.26	4.39	3.58
原料	w （Na₂O）	w （K₂O）	w （TiO₂）	w （SO₃）
水泥	0.87	0.64	—	—
煤矸石	1.69	2.10	0.87	0.36

焙烧条件	活性指数/%
焙烧条件	28 d	56 d
未焙烧	30.23	42.39
400 ℃	33.12	44.67
700 ℃	80.27	86.05
900 ℃	71.84	76.22

[1]	SHI Wangfang, ZHANG Yongsheng. Study on NO _x degradation performance of concrete-based non-metallic boron doped nitrogen-rich carbon nitride [J]. Inorganic Chemicals Industry, 2025, 57(3): 116-123.
[2]	HAN Wei, SONG Yongming, LIU Qi, XU Jinling, XU Rong, LI Chunquan, YIN Shuaijun, SUN Zhiming. Study on performance of calcium chloride assisted thermal activation of coal gangue and its peroxymonosulfate activation toward benzo（a）pyrene degradation [J]. Inorganic Chemicals Industry, 2025, 57(1): 103-112.
[3]	LIU Guangming. Study on photocatalytic and mechanical properties of C₃N₅/NH₂-MIL-125（Ti） modified concrete mortar [J]. Inorganic Chemicals Industry, 2025, 57(1): 120-128.
[4]	CHAI Chunjing, FENG Zhengjun, WU Haibin, SHI Xiaokai, ZHANG Junjie, SONG Huiping. Effect of coal gangue-based porous matrix on soil solute transport [J]. Inorganic Chemicals Industry, 2024, 56(9): 107-116.
[5]	LIU Cijun, WU Ziyang, CHENG Shukai, CHEN Xuyong. Effect of recycled fine aggregate on mechanical properties and autogenous shrinkage of ultra-high performance concrete [J]. Inorganic Chemicals Industry, 2024, 56(9): 75-81.
[6]	ZHANG Ruijun, CHEN Guoliang, SONG Chuncao, ZHU Yafei. Effects of graphene oxide on mechanical properties and chloride penetration resistance of ultra⁃high performance concrete incorporating recycled sand [J]. Inorganic Chemicals Industry, 2024, 56(8): 54-59.
[7]	YE Fen, CHENG Hao, XIANG Yuan, LIU Song, SHI Wei. Preparation of ceramic aggregate from electrolytic manganese slag and its application in concrete [J]. Inorganic Chemicals Industry, 2024, 56(6): 127-132.
[8]	BI Chao, ZHANG Xiaokang, WANG Xiugui. Study on hydration characteristics and durability of high-strength concrete modified by mechanically activated waste incineration slag [J]. Inorganic Chemicals Industry, 2024, 56(12): 142-149.
[9]	JIANG Lilong, LI Jianqiu, YANG Lin, ZHANG Qinggang. Study on performance of concrete with high-Mg phosphate tailing as mineral admixture [J]. Inorganic Chemicals Industry, 2024, 56(1): 90-95.
[10]	DONG Linlin, GAO Huafeng. Study on preparation of steel slag phase change concrete modified by hydrofluoric acid solution [J]. Inorganic Chemicals Industry, 2023, 55(5): 109-114.
[11]	WANG Lijuan, YAN Kezhou, GUO Zhiqiang, ZHAO Zhonghe, GUO Yanxia, CHENG Fangqin. Preparation of poly-aluminum chloride from acid leaching liquor of red mud-coal gangue activated by sodium salt [J]. Inorganic Chemicals Industry, 2023, 55(4): 76-83.
[12]	ZHANG Chenhu, MA Yi, ZHU Shan, CHEN Peng, WANG Chengyong, LI Ziwen. Study on adsorption of heavy metal ions in mineral processing wastewater by chelating modified coal gangue [J]. Inorganic Chemicals Industry, 2023, 55(4): 97-103.
[13]	HE Wenchao,XUE Jing,WANG Wei. Research on strength and creep characteristics of concrete containing fly ash microbead [J]. Inorganic Chemicals Industry, 2023, 55(1): 124-128.
[14]	WANG Yuan,WANG Zhi,QIN Hongyi. Study on properties of wet detoxification Fe-Cr slag as concrete admixture [J]. Inorganic Chemicals Industry, 2022, 54(3): 87-90.
[15]	Dang Ying. Experimental study on durability of green concrete with nano particle fly ash [J]. Inorganic Chemicals Industry, 2021, 53(7): 96-100.

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on microwave roasting-activated coal gangue to improve sulfate corrosion resistance of concrete

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 13

References 18

Related Articles 15

Metrics

Comments

Recommended 0