碱激发矿渣混凝土密实性超声无损检测法及其影响因素  

Ultrasonic Non-destructive Testing Method for the Compactness of Alkali-activated Slag Concrete and Its Influencing Factors

作　　者：李静 张灵 王昊 陈犇 陈东彬 黄莹 陈正[1] LI Jing;ZHANG Ling;WANG Hao;CHEN Ben;CHEN Dongbin;HUANG Ying;CHEN Zheng(Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,工程防灾与结构安全教育部重点实验室,南宁530004

出　　处：《材料导报》2024年第11期166-172,共7页Materials Reports

基　　金：国家自然科学基金(52108199);广西自然科学基金(2021GXNSFBA075014);广西科技基地和人才专项项目(AD21238007)。

摘　　要：研究了碱激发矿渣混凝土水胶比、模数、碱当量及粗骨料含量对其抗压强度、超声波速的影响,并通过分析混凝土配合比参数与密度、弹性模量、孔隙率之间的关系来揭示超声波速的变化机理。结果表明:不同配合比参数的碱激发矿渣混凝土超声波速与弹性模量成正比,与密度、孔隙率成反比,在超声无损检测过程中可将碱激发矿渣混凝土近似作为均质性实体材料进行建模计算,发现其超声波速与抗压强度呈线性关系。基于理论分析与试验结果建立了碱激发矿渣混凝土的密实性计算模型,可以为检测碱激发矿渣混凝土密实性作参考。The effects of water-binder ratio, modulus, alkali concentration and coarse aggregate content on the compressive strength and ultrasonic velocity of alkali-activated slag concrete were investigated, and the relationships between concrete mix proportions and density, elastic modulus, porosity were analyzed to reveal the variation mechanism of ultrasonic velocity. The results show that the ultrasonic velocity of alkali-activated slag concrete with different mix proportions is positively proportional to the elastic modulus and inversely proportional to the density and porosity. Alkali-activated slag concrete can be approximated as a homogeneous solid material for modelling and calculation in the process of ultrasonic nondestructive testing, and the ultrasonic velocity is found to be linearly related to the compressive strength. Based on the theoretical analysis and experimental results, a model for calculating the compactness of alkali-activated slag concrete is established, which can be used as a reference for the compactness testing of alkali-activated slag concrete.

关 键 词：碱激发矿渣混凝土 抗压强度 超声波速 无损检测 密实性 

分 类 号：TU528[建筑科学—建筑技术科学]