Influence and Mechanism Analysis of Particle Size Distribution of Multi-System Mineral Admixture on Concrete Performance

Abstract:

To explore the effect of mechanical activation on the particle size distribution of the composite admixture a self-designed test jet mill is used. We have studied the effects of different specific surface areas of composite admixtures on the workability, mechanical properties and durability of concrete and combined X-ray diffraction (XRD) with scanning electron microscopy (SEM) to analyze the mechanism of concrete performance improvement. Results showed that, mechanical activation can significantly increase the content of particles below 3 um; appropriate increase in the specific surface area of composite admixture is conducive to improving the performance of concrete; As the specific surface area increases, the hydration activity of the composite admixture increases first and then tends to be stable; during the hydration process, more thin-plate Ca(OH)₂ is converted into needle-shaped AFt, which improves the cement-based material and thereby improving the macro mechanical properties and durability.

• Periodical: Materials Science Forum (Volume 1036)
• Pages: 386-394
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1036.386
• Online since: June 2021
• Authors: Fu Xing Cheng*, Yong Liu, Ji Xiao, Xiao Xu Deng, Hai Long Wang
• Keywords: Electric Flux, Jet Mill, Mineral Admixture, Particle Size Distribution, Sulfate Attack

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