Effect of Nano-CaCO₃/Limestone Powder Composite on the Early Age Cement Hydration Products

Abstract:

In this study, the effect of surface structure of nanoCaCO₃/limestone powder composite particles (NC/LS) on the hydration products of cement at early age is investigated. The surface structure of NC/LS is observed by field emission scanning electron microscope (FE-SEM) and compared with original limestone powders. X-ray diffraction (XRD) is used to investigate the types of hydration products and calculate the Ca (OH)₂ (CH) particle size and crystal orientation degree. Additionally, FE-SEM and atomic force microscopy (AFM) are applied to observe the particle size, shape and distribution of hydration products. The results reveal that the nanoCaCO₃ particles are distributed throughout the surface of limestone powders, and therefore successfully formed NC/LS. Secondly, the particle size, morphology and distribution of the cement hydration products are affected by the surface structure of NC/LS, so the microstructure of hardened cement paste at early age is enhanced.

• Periodical: Key Engineering Materials (Volume 703)
• Pages: 354-359
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.703.354
• Online since: August 2016
• Authors: Hua Shan Yang*, Yu Jun Che, Man Zhang
• Keywords: Limestone Powder, Nano-Calcium Carbonate, Portland Cement

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