碱矿渣胶凝材料的固砂特性及抗硫酸盐侵蚀性能

doi:10.11896/cldb.19070149

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Abstract As a kind of low-carbon and environment-friendly cementing material for roadbed and foundation reinforcement, alkali-activated geopolymer grouting material not only has no calcium hydroxide in its hydration products, but also some hydration products can provide adsorption of sulfate ions, with excellent anti-sulfate erosion effect and broad application prospect. In this experiment, the consolidation properties and sulfate resistance of magnesia-activated slag (GGBS-MgO), calcium oxide-activated slag (GGBS-CaO) and cement (PC) were studied by appearance, unconfined compressive strength, mass change, the change of mineral composition and microstructure. The results show that slag activated by CaO obtains a higher pH value than MgO activated slag. Higher pH value is beneficial to the fracture of vitreous O-Si-O and O-Al-O bonds in slag, which causes a better consolidation characteristic as more hydration products. The unconfined compressive strength of sand samples stabilized by GGBS-MgO and GGBS-CaO increases 42.2% and 101.2% respectively after curing for 28 d. When the sand samples were immersed in 5wt% Na₂SO₄ solution for 150 d, sulfate ions react with calcium hydroxide to form ettringite and gypsum in PC, which results in more pores and obvious cracking. After 150 d of immersion, the unconfined compressive strength of PC is decreased to 0.41 MPa while the unconfined compressive strength of GGBS-MgO and GGBS-CaO continuously increases due to the formation of hydrotalcite. As a result of adsorption of sulfate ions by hydrotalcite, the sulfate resistance of GGBS-MgO and GGBS-CaO is better than PC.

Key words： chemical stabilization alkali-activated material stabilized sand sulphate attack

Published: 26 April 2020

CLC number:

TU528

Fund:This work was supported by the Anhui Provincial Natural Science Foundation (1708085QE102, 190808ME173), the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2016YFC0701700), the National Natural Science Foundation Youth Fund of China (51578004, 51608004, 51778003).

Corresponding Authors: Daosheng Sunreceived his B.E. degree in building materials and products from Chongqing University in 1986 and received his Ph.D. degree in materials from the Nanjing Tech University in 2004. He was granted professor in 2005. He is the tutor of Anhui Jianzhu University and Hefei Institute of Physical Science, Chinese Academy of Sciences. He is the member of Anhui Silicate Society, Anhui Cement Standardization Technical Committee and Anhui Cement Association. His research interests include high-performance concrete, comprehensive utilization of so-lid waste, and advanced building materials.

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	SUN Daosheng
	YE Zhe
	LIU Kaiwei
	WANG Aiguo
	GUAN Yanmei
	CHEN Dong

Cite this article:

SUN Daosheng,YE Zhe,LIU Kaiwei, et al. Consolidation Characteristics and Sulfate Resistance of Alkali-activated Slag Cementitious Materials[J]. Materials Reports, 2020, 34(10): 10061-10067.

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http://www.mater-rep.com/EN/10.11896/cldb.19070149 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10061

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