tailieunhanh - Analysis of the attenuative behaviour of accelerated cement based materials through a series of ultrasound Pulse Echo measurements

In this study, the effects of alkaline accelerating admixture and its dosage on cementitious material’s behavior at early ages were evaluated through a series of ultrasound Pulse echo measurements. | Analysis of the attenuative behaviour of accelerated cement based materials through a series of ultrasound Pulse Echo measurements Engineering Solid Mechanics 7 2019 109-120 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm Analysis of the attenuative behaviour of accelerated cement based materials through a series of ultrasound Pulse Echo measurements Nabil Khatiba El Houssaine Ouachaa Bouazza Faiza Mohamed Ezzaidia and Hicham Banounia a Laboratory of Metrology and Information Processing Ibn Zohr University Faculty of science . 8106 Agadir Morocco A R T I C L EI N F O ABSTRACT Article history In this study the effects of alkaline accelerating admixture and its dosage on cementitious Received 26 December 2018 material s behavior at early ages were evaluated through a series of ultrasound Pulse echo Accepted 26 February 2019 measurements. Thus those measurements consist on following the evolution of frequency Available online dependent attenuation coefficient during cementitious material age. Four stages can be identified 11 April 2019 Keywords on the attenuation coefficient vs. mortar age graphs indicating that the development of the Non-destructive testing attenuation parameter is closely related to the setting and the hardening phenomena. Also the Ultrasound ultrasound histograms representing the evolution of the different echoes backscattered by the Pulse echo method media of the container filled with cementitious material s samples were characterized in order to Mortar assess the attenuative effect of alkaline accelerator and its dosage during the setting and the Alkaline Accelerator hardening period. Thus the combined use of ultrasound P-wave measured density and young modulus parameters results in a comprehensive ultrasound method that gives a more effective picture of the void volume and resistivity of the accelerated cementitious materials. Ultrasound P- waves were generated using a 1 MHz central