Interface Bonding Performance of Ultra-High Performance Alkali-Activated Concrete Matrix and Steel Fiber

doi:10.16552/j.cnki.issn1001-1625.2025.0351

Abstract

Abstract: In order to reduce carbon emissions and improve the comprehensive utilization rate of industrial solid waste, this paper used alkali-activated cementitious materials to prepare ultra-high performance alkali-activated concrete (UHP-AAC) matrix and analyzed the effects of different curing ages, water glass modulus, and alkali equivalent on its setting time, compressive strength, and flexural strength. Additionally, the interface bonding performance between steel fibers and UHP-AAC matrix was studied through single fiber pull-out tests, analyzing the variation rules of evaluation parameters for bonding strength. X-ray diffraction (XRD) and low-field nuclear magnetic resonance (LF-NMR) were used to analyze the reaction products and pore structure of UHP-AAC matrix, while scanning electron microscopy (SEM) was employed for the characterization of the surfaces of the pulled-out steel fibers. The results show that the increase in curing age and water glass modulus has a positive impact on the strength of matrix and the bonding performance between steel fibers and matrix. When the water glass modulus is 1.5, the compressive strength, flexural strength, and peak load at 28 d increase by 10.4%, 4.3%, and 13.3%, respectively, compared to when the modulus is 1.1. However, with the increase in alkali equivalent, a large amount of hydration products precipitate on the surfaces of the particles, leading to an increase in both macropores amounts and overall porosity, which is detrimental to the strength of UHP-AAC matrix and its interface bonding performance with steel fibers.

Key words: ultra-high performance concrete, steel fiber, alkali-activation, compressive strength, interface bonding, micro-property

CLC Number:

TU528

CUI Yifei, AI Weixia, ZHANG Yicong, HUANG Ting, LIU Menghua, XU Nuo, BAO Jiuwen. Interface Bonding Performance of Ultra-High Performance Alkali-Activated Concrete Matrix and Steel Fiber[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3573-3586.

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