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Mechanical and Ultrasonic Testing of Self-Compacting Concrete

by Hongbo Li 1,2,3,†, Hao Sun 1,†, Juncang Tian 1,2,3,*, Qiuning Yang 1,* and Qingqing Wan 1
1
College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
2
Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation, Yinchuan 750021, China
3
Engineering Research Center for Efficient Utilization of water Resources in Modern Agriculture in Arid Regions, Yinchuan 750021, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work and should be considered co-first authors.
Energies 2019, 12(11), 2187; https://doi.org/10.3390/en12112187
Received: 18 May 2019 / Revised: 31 May 2019 / Accepted: 4 June 2019 / Published: 8 June 2019
Based on the urban shantytown renovation project in Hongguang Town, Helan County, Ningxia, in Northwest China, the influence of fly ash and silica fume admixture on the mechanical properties of Self-compacting Concrete (SCC) was tested and analyzed in this work. The experimental tests including compressive strength, splitting strength, triaxial strength and an ultrasonic nondestructive test. Furthermore, the Back Propagation (BP) neural network algorithms were established. The results show that there is an obvious difference between the development law of compressive strength of SCC and that of ordinary concrete. The splitting pressure ratio of SCC is 1/10 to 1/8, while that of ordinary concrete is 1/13 to 1/10. Moreover, the peak strain, peak stress and initial stiffness of SCC increase with the increase of the confining pressure when compressed from three directions. In addition, the ultrasonic amplitude of SCC can reflect the changing laws of its compressive strength. As a conclusion, the addition of fly ash and silica fume increases the splitting pressure ratio of SCC. More importantly, the compressive strength formula for SCC with silica fume and a low content of fly ash is proposed, and the model equation between the amplitude and compressive strength is given. This study provides a reference for the mixture ratio of fly ash and silica fume in the application of SCC. View Full-Text
Keywords: self-compacting concrete; mineral admixture; mechanical properties; ultrasonic testing; model equation self-compacting concrete; mineral admixture; mechanical properties; ultrasonic testing; model equation
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Li, H.; Sun, H.; Tian, J.; Yang, Q.; Wan, Q. Mechanical and Ultrasonic Testing of Self-Compacting Concrete. Energies 2019, 12, 2187.

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