碱激发二元/三元复合工业废渣胶凝材料的力学性能与微观机制

doi:10.11896/cldb.19080090

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Abstract To investigate the synergistic effect of multiple industrial waste residues on the mechanical properties of alkali-activated cementitious materials, this paper took water glass and sodium hydroxide as activators, fly ash (FA) as basic powder, ground granulated blast-furnace slag (GGBS) and steel slag (SS) as additive composite powders to produce cementitious materials. The effects of GGBS, SS and GGBS+SS compounded with FA and their contents on the mechanical properties of standard cured paste samples were studied through laboratory tests, and the internal mechanism of microstructure and pore distribution characteristic of hardened paste was analyzed by scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests. The results show that although the single addition of SS delayed the development of early compressive strength, the composite addition of GGBS and SS could make up for the deficiency of SS, so as to enhance the compressive strength of the material. With 40% GGBS, the 3 d and 28 d compressive strengths of the sample were increased by 152.5% and 81.9%, respectively, and with 40% (GGBS+SS), the 3 d and 28 d compressive strengths of the sample were increased by 89.2% and 72.0%, respectively. The promotion effect of composite addition of GGBS+SS on the early (3 d) compressive strength was weaker than that of the single addition of GGBS, but the effect of composite addition of GGBS+SS on the later (28 d) compressive strength could reach the same level as that of the single addition of GGBS. In addition, the single addition of GGBS increased the ratio of compressive strength to flexural strength and worsened the brittleness of the material, while composite addition of GGBS and SS could weaken the brittleness of the material. Under the same strength, the elastic modulus of the sample of composite addition of GGBS+SS is greater than that of the sample of single addition of GGBS, which has better resistance to deformation. The single addition of SS would reduce the amount of gelling products in the matrix, while the composite addition of GGBS and SS could make the sample obtain a microstructure at the same level of compactness as the sample with single addition of GGBS. The single addition of SS would increase the amount of capillary pores and the pore volume of the matrix, while the composite addition of GGBS and SS could make the capillary pores transform into gel pores with smaller volume, thus improving the mechanical strength of materials at the macro level.

Key words： alkali-activated materials fly ash ground granulated blast-furnace slag steel slag compressive strength flexural strength elastic modulus microstructure

Published: 02 December 2020

CLC number:

TU525

Fund:This work was supported by the National Natural Science Foundation of China (42072297) and the Nanjing Transportation Science and Technology Project (2019).

About author:: Weilong Songis a Ph.D. student majoring in geotechnical engineering at Southeast University, Nanjing, China. He graduated from Chang'an University with a bachelor's degree in road bridge and river crossing engineering. He is mainly engaged in the research of industrial solid waste utilization and underground engineering.Zhiduo Zhuis a professor in the Department of Geotechnical Engineering at Southeast University, Nanjing, China. He received his bachelor's degree from Nanjing University and his master's and doctor's degree from Southeast University. His research interests include foundation treatment, underground engineering and environmental geotechnics.

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	SONG Weilong
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	PU Shaoyun
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	PENG Yuyi
	GU Xiaobin
	WEI Yongqiang

Cite this article:

SONG Weilong,ZHU Zhiduo,PU Shaoyun, et al. Mechanical Performance and Micro-mechanism of Alkali-activated Binary／Ternary Composite Industrial Waste Residues Cementitious Materials[J]. Materials Reports, 2020, 34(22): 22070-22077.

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http://www.mater-rep.com/EN/10.11896/cldb.19080090 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22070

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