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Title: Evaluation on the Mechanical Performance of Low-Quality Recycled Aggregate Through Interface Enhancement Between Cement Matrix and Coarse Aggregate by Surface Modification Technology

Author(s): Heesup Choi, Hyeonggil Choi, Myungkwan Lim, Masumi Inoue, Ryoma Kitagaki, and Takafumi Noguchi

Publication: IJCSM

Volume: 10

Issue: 1

Appears on pages(s): 87–97

Keywords: surface-modification technology, interfacial transition zone (ITZ), low-quality recycled coarse aggregate, interface strength, durability, micro-crack

DOI: 10.1007/s40069-015-0124-5

Date: 3/31/2016

In this study, a quantitative review was performed on the mechanical performance, permeation resistance of concrete,and durability of surface-modified coarse aggregates (SMCA) produced using low-quality recycled coarse aggregates, the surfaceof which was modified using a fine inorganic powder. The shear bond strength was first measured experimentally and the interfacebetween the SMCA and the cement matrix was observed with field-emission scanning electron microscopy. The results showedthat a reinforcement of the interfacial transition zone (ITZ), a weak part of the concrete, by coating the surface of the originalcoarse aggregate with surface-modification material, can help suppress the occurrence of microcracks and improve the mechanicalperformance of the aggregate. Also, the use of low-quality recycled coarse aggregates, the surfaces of which were modified usinginorganic materials, resulted in improved strength, permeability, and durability of concrete. These results are thought to be due tothe enhanced adhesion between the recycled coarse aggregates and the cement matrix, which resulted from the improved ITZ inthe interface between a coarse aggregate and the cement matrix.