The Mechanical Properties and Microstructure of Tailing Recycled Aggregate Concrete

Author:

Xu Fan12ORCID,Li Zhijun12,Li Tao3ORCID,Wang Sheliang4

Affiliation:

1. School of Civil Engineering, Xi’an Technological University, Xi’an 710021, China

2. Xi’an Key Laboratory of Civil Engineering Testing and Destruction Analysis on Military-Civil Dual Use Technology, Xi’an 710021, China

3. College of Architecture Engineering, Huanghuai University, Zhumadian 463000, China

4. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

Abstract

The aim of this study was to develop sustainable concrete by recycling concrete aggregates from steel waste and construction waste (iron ore tailings (IOTs) and recycled coarse aggregates (RCAs)) to replace silica sand and natural coarse aggregates. In experimental testing, the compressive strength, peak strain, elastic modulus, energy dissipated under compression, and compressive stress–strain curve were analyzed. Microscopically, scanning electron microscopy and energy-dispersive spectrometry were employed to investigate the microstructural characteristics of the interfacial transition zone (ITZ), and the results were compared with the ITZs of natural aggregate concrete and recycled aggregate concrete (RAC). In addition, the pore structure of concrete was determined by nuclear magnetic resonance. The results revealed that an appropriate IOT content can improve the ITZ and compactness of RAC, as well as optimize the mechanical and deformation properties of RAC. However, due to the presence of a smaller number of microcracks on the surface of IOT particles, excessive IOTs could reduce the integrity of the matrix structure and weaken the strength of concrete. According to the research, replacing silica sand with 30% IOTs led to a reduction in the porosity and microcracking which resulted in a much denser microstructure.

Funder

Natural Science Foundation of Shaanxi Province

Publisher

MDPI AG

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