Authors : Nabil Khatib, El Houssaine Ouacha, Bouazza Faiz, Mohamed Ezzaidi and Hicham Banouni
Abstract: Ultrasound pulse echo measurements have been successfully used to evaluate the setting and hardening behaviour of cementitious materials. In the first part of this study, the different hydration stages of Portland composite cements CPJ45 and CPJ35 have been identified by following the evolution in time (mortar age) of the frequency dependent attenuation coefficient and the modulus of the reflection coefficient as well as the setting time of both cement types has been identified. A second part of this study was to investigate the effects of an alkali-free setting accelerator for shotcrete and its dosage on setting and hardening behaviour of cementitious mixtures. Ultrasound measurements were done using P-waves, generated by a 1 MHz central frequency immersion transducer.
Nabil Khatib, El Houssaine Ouacha, Bouazza Faiz, Mohamed Ezzaidi and Hicham Banouni, 2018. Ultrasound Study of Setting and Hardening Behaviour of Mortar Using Portland Composite Cements CPJ45 and CPJ35 and Different Dosages of An Alkali-Free Setting Accelerator for Shotcrete. Journal of Engineering and Applied Sciences, 13: 7150-7155.