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Corresponding Author

李洪珍, 女, 正高级工程师. E-mail: ymjtjszx2022@163.com

Abstract

To reduce the production cost of foam concrete and increase the resource utilization rate of ultra-fine iron tailings sand (UITS), this study used UITS as an admixture to replace part of the cement with the same mass to prepare foam concrete. The working properties such as fluidity and water absorption rate, and the mechanical properties such as compressive strength and flexural strength of foam concrete were studied. The microscopic pore structure and hydration products were analyzed by scanning electron microscopy (SEM). The results show that when the UITS content ranges from 0% to 60%, with the increase of UITS content, the fluidity of foam concrete shows a trend of increasing first and then decreasing, while the water absorption rate gradually increases. Both compressive strength and flexural strength monotonically decrease with the increase of UITS dosage. When the UITS content is ≤50%, the 28-day compressive strength meets the road performance requirements of the roadbed (≥1. 2 MPa). Microstructure analysis indicates that the increase in the UITS content leads to significant changes in the pore structure of foam concrete, with the number of small pores gradually decreasing and the number of large pores gradually increasing. At the same time, the generation amount of cement hydration products (such as C-S-H gel) decreases, which is in good agreement with the attenuation law of macroscopic mechanical properties. The research findings provide a preliminary theoretical basis for the application of UITS foam concrete in road engineering.

Publication Date

10-27-2025

DOI

10.14048/j.issn.1671-2579.2025.05.026

First Page

242

Last Page

250

Submission Date

November 2025

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