| MATERIALS AND SUSTAINABLE DEVEL OPMENT:ENVIRONMENT-FRIENDLY MATERIAL S AND MATERIAL S FOR ENVIRONMENTAL REMEDIATION |
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| Meso-/Micro-Structure of Interfacial Transition Zone and Durability of Recycled Aggregate Concrete: a Review |
| LI Heng1, GUO Qingjun1, WANG Jiabin1, ZHANG Kaifeng2
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1 School of Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021, China
2 China West Construction North Co., Ltd, Xi’an 710065, China |
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Abstract With the continuous development of the city, the output of waste concrete is increasing gradually. The disposal method of waste concrete is stacking and landfill, which damages the ecological environment seriously. Promoting the production of recycled aggregate (RA) from waste concrete and preparing recycled aggregate concrete(RAC) from RA have become research hotspots. At present, RAC has been widely used in new urban structures.
The interfacial transition zone (ITZ) structure of RAC has highly porosity, and the diffusion of water and corrosive ions intensifies the deterioration of the ITZ. Therefore, the ITZ structure becomes the strength limiting phase of RAC. In recent years, in order to improve the mechanical properties and durability of RAC, scholars have made continuous research on promoting the ITZ structure, and achieved fruitful results.
The scholars conducted study on the ITZ structure from the perspective of meso- and micro-structure systematically, the influence mechanism of the ITZ structure between new and old aggregate mortar on the performance of RAC was revealed. At the same time, many improvements have been made with the porosity of the RA and ITZ structure as the entry point, including aggregate prewet, paste encapsulated, carbonation, mineral admixture, improvement of concrete preparation methods. These methods have achieved good results and reduced the negative effects of RA properties and ITZ structure on RAC. In the northwest China, the anti-freeze-thaw cycles and salt-resistance erosion are the main problems in the research of durability of RAC. Because the temperature difference is large and the saline soil is rich in this area. Currently, relevant scho-lars have basically proved the freeze-thaw cycle and salt erosion process mechanism of RAC through a series of experimental studies, the chloride ion diffusion model has been established for chloride ion diffusion assessment on salt erosion research. And made the microscopic analysis on the erosion ITZ structure of a single type of erosion ion. In addition, it is proposed to reduce the water-cement ratio of RAC, select high-quality RA, blend with appropriate amount of admixture and adulterating agent, which can reduce the formation of ITZ and improve the durability of RAC.
This paper summarizes the research progress of RAC, and reviews the ITZ structure, mechanical properties, freeze-thaw resistance and salt corrosion resistance of RAC comprehensively. The method for improving the mechanical properties and durability of RAC is combed. The main problems faced by RAC research are analyzed and its prospects are prospected, in order to lay a theoretical foundation for the future recycling of waste concrete and the durability evaluation of RAC structures in northwest China.
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Published: 24 June 2020
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| Fund:National Natural Science Foundation of China (51908440), the Natural Science Foundation of Shaanxi Province (2018JQ5032) and the Natural Science Foundation of Education Department of Shaanxi Province (18JK0376) |
About author:: Heng Lireceived his bachelor of engineering degree from Xi’an Technological University (XATU) in June 2018. Now he is a postgraduate student of Xi’an Technological University, and he studies on concrete durability under the guidance of Mr. Wang Jiabin. At pre-sent, the main research field is the research on the composite salt erosion durability of recycled aggregate concrete.
Jiabin Wangreceived his Ph.D. degree in structure engineering from Xi’an University of Architecture and Technology (XAUAT) in 2017. He is currently a lecturer in Xi’an Technological University (XATU) and participates in the durability of shotcrete (sprayed concrete) and recycled aggregate concrete. In recent years, more than 20 papers have been published at home and abroad, SCI and EI retrieval of 10. |
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2020, Vol. 34 
