养护温度对赤泥基路用胶凝材料性能及微观结构的影响

doi:10.11896/cldb.24060144

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Abstract Red mud-based road cementitious material can be used instead of cement in the construction of semi-rigid road bases. Shandong Province has a warm temperate monsoon climate with significant fluctuations in temperature throughout the year. Different months result in different curing temperatures for the cementitious material. This work focused on the influencing law and underlying mechanism of variation of curing temperature on the compressive strength and microstructure of red mud-based road cementitious material. The curing temperatures applied in the experiment was changed amongst 1 ℃, 4 ℃, 10 ℃, 16 ℃, 20 ℃, 25 ℃, and 28 ℃, which was determined based on the actual temperature data in Shandong(Jinan) from 2006 to 2023. The instruments used in strength test and microstructure observation were a universal testing machine and a ¹H low-field nuclear magnetic resonance analyzer, and the means utilized for revealing the underlying mechanism of curing temperature variation-induced performance evolution included X-ray diffractometry, thermogravimetry, and ICP-OES. It could be concluded that an increase in curing temperature would promote the development of compressive strength of red mud-based road cementitious material. The cementitious material cured at 28 ℃ achieved a 7-day compressive strength of 21.15 MPa, 67.41% higher than that achieved under the curing temperature of 1 ℃. When the material was cured at a temperature of ≥20 ℃, its whole-curing-stage strength development rate was higher than 1 MPa/d. Increasing the curing temperature would result in optimized pore structure distribution of the stone body. After 7 days of curing, with the increase of curing temperature, the proportions of gel pores and transition pores in the stone bodies increased from 37.82% to higher than 80% and the proportion of pores decreased from 62.18% to about 15%. The main hydration product of red mud-based road cementitious material is(C, N)-A-S-H gel, which plays an important role for strength development. Higher curing temperatures are conducive to the dissolution of Si/Al elements in red mud, thus increasing the production of (C, N)-A-S-H gel. For the application of red mud-based cementitious material to road engineering, it is recommended not to perform road construction when monthly average temperature is below 10 ℃, and to extend the curing time to accelerate strength development when monthly average temperature is within 10—20 ℃.

Key words： red mud-based road cementitious material curing temperature compressive strength pore structure hydration product

Published: 25 November 2024 Online: 2024-11-22

CLC number:

U414

Fund:Shandong Province Key R & D Program (Major Technological Innovation Project) (2023ZLGX01,2021CXGC010301) and the Competitive Innovation Platform Project of Shandong Province (2023CXPT080).

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	HAN Ruikai
	CHEN Yuxin
	ZHANG Jian
	LI Zhaofeng
	WANG Yansheng

Cite this article:

HAN Ruikai,CHEN Yuxin,ZHANG Jian, et al. Effects of Curing Temperature on Properties and Microstructure of Red Mud-based Road Cementitious Material[J]. Materials Reports, 2024, 38(22): 24060144-8.

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http://www.mater-rep.com/EN/10.11896/cldb.24060144 OR http://www.mater-rep.com/EN/Y2024/V38/I22/24060144

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