Abstract
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.
Highlights
IntroductionAs a major coal producer, China uses coal as its primary fuel for electricity production
As a major coal producer, China uses coal as its primary fuel for electricity production.During recent decades, the rapid development of the power industry has led to an increase in the total amount of fly ash, which is expected to reach 400 million tons by 2020 [1]
The compressive strength of 28d Self-compacting Concrete (SCC) in Figure 4c was predicted by Back Propagation (BP) neural network algorithms
Summary
As a major coal producer, China uses coal as its primary fuel for electricity production. SCC has better properties in terms of realizing labor-saving concrete pouring to improve the quality and speed of construction, and in terms of upgrading the living environment of surrounding residents with reduced noises. It helps solve the steel tube vibration problem during construction [18,19,20]. The relationship between the fly ash and silica fume content and the mechanical properties of SCC were studied in this work
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