Study on the correlation between pore structure characterization and early mechanical properties of foamed concrete based on X-CT

被引：0
|
作者：
Zhao, Danni [1 ]
Xu, Jiangbo [1 ]
Han, Zemin [1 ]
Liu, Yifan [1 ]
Liu, Yuan [2 ]
Yang, Xiaoyu [3 ]
机构：
[1] College of Highway, Chang'an University, Xi'an,710064, China
[2] Rocket force university of Engineering, Xi'an,710000, China
[3] Sichuan Jiaotou Design Consulting Research Institute Co.Ltd, Chengdu,610041, China
来源：
Construction and Building Materials | 2024年 / 450卷
关键词：
To investigate the differences in early mechanical properties between rapid-hardening foam concrete (RHFC) and ordinary foam concrete (OFC); as well as the influence of pore structure on early mechanical performance. Based on X-CT technology and uniaxial compression tests; the differences degree of early mechanical properties between the two were quantified; achieving 3D reconstruction and quantitative characterization of the pore structures; revealing the distribution patterns of pore structure parameters. Meanwhile; combined with grey relational theory; the correlation between pore structure and early mechanical properties was clarified; further explaining the underlying mechanisms of macroscopic mechanical property differences from the perspective of pore structure. The research indicates that the load-displacement curves of both types of foam concrete exhibit an initial densification phase; elastic phase; yield phase; and plateau phase; and that RHFC significantly outperforms OFC in terms of early compressive strength and total energy absorption. The OFC shows higher planar porosity and fractal dimensions in both 2D and 3D compared to RHFC. The pore size distribution of both types follows a non-standard lognormal distribution; primarily due to the uneven hydration reaction rates affecting bubble formation and expansion rates. Additionally; the pore shapes in both types are predominantly spherical; with sphericity values concentrated between 0.8 and 1.0. RHFC exhibits higher pore compactness; with negative correlations observed between sphericity; compactness; and pore volume. The primary pore connections are open and closed pores. There is a significant correlation between pore structure and early mechanical properties for both types of foam concrete; with correlation degrees of 0.6787 for porosity; 0.6667 for sphericity (0.9–1.0); and 0.6558 for compactness (0.4–1.0). This study provides a comprehensive theoretical basis and technical support for the application of RHFC in emergency repair and construction projects. © 2024 Elsevier Ltd;
D O I：
10.1016/j.conbuildmat.2024.138603
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