工程开挖土的资源化再利用研究进展

doi:10.11896/cldb.20110138

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Abstract In recent years, to expand urban space and realize the efficient utilization of land resources, modern urban construction has gradually extended downward, such as subway, tunnels and underground multi-storey buildings. However, a large amount of engineering excavation soil (ES) has been generated during these construction processes. Nowadays, the treatment of ES has become a major problem in urban management. Meanwhile, China is in such a period, during which a large number of infrastructures need to be constructed, which is bound to consume a lot of natural resources. Therefore, it is quite significant for solving the current problems of large ES production and accumulation, alleviating the shortage of earth resources and ensuring sustainable development to partly replace the non-renewable resources with ES.
However, the engineering performance of ES is poor. Moreover, it is hard to form a unified standard for ES utilization owing to its complex and highly locale-dependent composition. What a researcher can do is to find as many appropriate ways for ES reutilization as possible, while attempting various methods to deal with ES itself so as to improve its engineering performance.
The ways for ES reutilization mainly include utilization as fine aggregate or pozzolanic material in concrete and cementitious matrix, respectively, the preparation of controlled low strength materials (CLSM), and the preparation of building material products with calcined ES. According to the research results, the plasticity of ES can be successfully reduced, and its engineering performance can be significantly improved by the means of sieving, stabilizing or modifying; the ES calcined at low temperature, has been proved to obtain certain pozzolanic activity, while the activity mainly depends on the types and contents of clay minerals contained in ES itself; in comparison, the most convenient way for ES reutilization is to prepare CLSM, and the ES-CLSM has been successfully applied abroad; all kinds of ES have been verified to be able to be utilized to prepare sintered brick or ceramsite after blending with appropriate supplementary materials, as the grade of products mainly depends on the quality of ES used.
This paper gives a detailed review on ES reutilization in recent 25 years. Firstly, the general compositions and characteristics of ES are introduced, and the reasons for its poor engineering performance are pointed out. Then, the main existing ways for ES reutilization are classified and detailed. Meanwhile, the existing problems and corresponding solutions in these reutilization processes are summarized. Finally, a comprehensive evaluationis is made and a reasonable resource reutilization process is proposed to provide reference for the follow-up ES research.

Key words： engineering excavated soil reutilization engineering performance fine aggregate calcination pozzolanic activity

Published: 10 July 2022 Online: 2022-07-12

CLC number:

TU526

Fund:National Natural Science Foundation of China (U1801254, 51925805).

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	Articles by authors
	WEI Guanqi
	WANG Yanshuai
	HONG Shuxian
	DONG Biqin
	XING Feng

Cite this article:

WEI Guanqi,WANG Yanshuai,HONG Shuxian, et al. Research Progress of Resource Reutilization of Engineering Excavated Soil[J]. Materials Reports, 2022, 36(13): 20110138-9.

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http://www.mater-rep.com/EN/10.11896/cldb.20110138 OR http://www.mater-rep.com/EN/Y2022/V36/I13/20110138

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