Study on the Microstructure of RFA Cement Mortar after Modification

Abstract:

The microstructures of fine recycled concrete aggregate (FRCA) after modifications in cement mortar were studied. The result indicated that the modification of RFA could strengthen the enhancement effect on microstructure when modified by 20wt% silica fume (SF) grout, 10wt% Polyvinyl alcohol (PVA) solution. After modification by SF grout and PVA solution, the thickness of interfacial transition zone (ITZ) of RFA cement mortar was decreased by 50% compared with the unmodified samples. The ITZ between RFA and cement paste was studied and the surface microstructure and sectional morphology of RFA was observed by scanning electron microscopy (SEM). Analyzing the modification mechanism and Building the superficial micro-structure model of RFA in cement mortar was carried out.

• Periodical: Applied Mechanics and Materials (Volume 540)
• Pages: 229-232
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.540.229
• Online since: April 2014
• Authors: Fu Xing Wang, Ying Lv, Guo Zhong Li*
• Keywords: Interfacial Transition Zone, Microstructure, Modification, PVA, Structural Model

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