Formation Kinetics of Regenerated Cement Clinker Calcined by Using Wasted Recycling Concrete Powders as Raw Meals

Abstract:

Artificial aggregates with high strength and a similar mineral composition to Portland cement clinker are made up of industrial waste and limestone, which are prepared for recycling concrete. Regenerated cement clinker is fabricated by recycling concrete powder added with a small amount of correction raw materia. Through the Gentling equation computing and microstructure morphology observation, the apparent activation energy (Ea) of two kinds of regenerated cement clinkers are 199 kJ/mol and 333 kJ /mol respectively, which is lower than that of traditional cement clinker (518 kJ/mol). The reaction rate constant (k) of regenerated cement clinker are about 4.8108×10^-5 s^-1 and 2.5003×10^-5 s^-1 at 1350°C. At the process of calcination, the formation temperature of C₃S and sintering temperature of regenerated cement clinker are lower than that of the traditional cement clinker.

• Periodical: Advanced Materials Research (Volumes 1073-1076)
• Pages: 1309-1312
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1073-1076.1309
• Online since: December 2014
• Authors: Jie Zhang, Zong Hui Zhou*, Xin Cheng
• Keywords: Artificial Aggregates, Formation Kinetics, Recycling Concrete, Regenerated Cement Clinker

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