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Validation of complex electrical properties of concrete affected by accelerated alkali-silica reaction
Cement and Concrete Composites ( IF 10.5 ) Pub Date : 2020-06-13 , DOI: 10.1016/j.cemconcomp.2020.103660
Yasaman Khajehnouri , Patrice Rivard , Michel Chouteau , Charles L. Bérubé

Alkali-silica reaction (ASR) is one of the most damaging problems with chemical alteration causing mechanical and physical changes in the concrete properties. Therefore in order to control concrete durability, a fast, non-destructive method aiming at detecting ASR is needed before an advanced stage (external visible signs) especially in field investigation. This paper focuses on the validation of the complex electrical measurements using spectral induced polarization (SIP) to monitor ASR development in concrete. Significant relationships were studied between the electro-chemical and physico-mechanical properties of concrete affected by ASR over time (22 weeks in accelerated conditions). Non-destructive methods (SIP, ultrasonic pulse velocity, expansion, and mass variation) and destructive testing (compressive strength, modulus of elasticity, petrographic examination) were used to monitor concrete mixtures (reactive and reference) submitted to accelerated laboratory test conditions. A significant evolution of SIP responses (phase lag, total chargeability, mean relaxation time) was found in the concrete specimens affected by ASR over the low frequency range. This observation was confirmed by other measurements specially expansion, UPV, modulus of elasticity, and petrographic analysis. Finally, this paper suggests SIP method as an effective non-destructive technique to monitor ASR development.



中文翻译:

加速碱-二氧化硅反应对混凝土复杂电性能的验证

碱-二氧化硅反应(ASR)是化学变化最破坏性问题之一,化学变化会引起混凝土性能的机械和物理变化。因此,为了控制混凝土的耐久性,特别是在现场调查中,需要在高级阶段(外部可见标志)之前,以检测ASR为目标的快速,无损的方法。本文着重于使用频谱感应极化(SIP)监测混凝土中ASR的发展来进行复杂的电气测量。研究了随时间(在加速条件下为22周)受ASR影响的混凝土的电化学和物理机械性能之间的重要关系。非破坏性方法(SIP,超声脉冲速度,膨胀和质量变化)和破坏性测试(抗压强度,弹性模量,岩石学检查)用于监测提交给加速实验室测试条件的混凝土混合物(反应性和参考性)。在低频范围内,受ASR影响的混凝土样品中发现了SIP响应的显着变化(相位滞后,总充电能力,平均弛豫时间)。其他测量值,尤其是膨胀率,UPV,弹性模量和岩石学分析证实了这一观察结果。最后,本文提出了SIP方法作为一种有效的无损监测ASR发展的技术。在低频范围内,在受ASR影响的混凝土试样中发现了平均松弛时间)。其他测量值,尤其是膨胀率,UPV,弹性模量和岩石学分析证实了这一观察结果。最后,本文提出了SIP方法作为一种有效的无损监测ASR发展的技术。在低频范围内,在受ASR影响的混凝土试样中发现了平均松弛时间)。其他测量值,尤其是膨胀率,UPV,弹性模量和岩石学分析证实了这一观察结果。最后,本文提出了SIP方法作为一种有效的无损监测ASR发展的技术。

更新日期:2020-06-25
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