ABSTRACT This study investigated the fabrication of a functional composite material using waste concrete powder (WCP), which is a novel method for effectively utilizing waste concrete. The WCP was obtained by milling waste concrete via pot milling. To introduce the absorption characteristics of the composite material, a zeolite based on WCP (WCP‐Z) was synthesized using a hydrothermal method. WCP‐Z is an analcime‐type zeolite. The effects of WCP‐Z content on the flexural strength, flexural modulus and absorption characteristics of the proposed functional composite material were investigated. As the WCP‐Z content increased, the flexural strength of the composite initially remained almost identical until the WCP‐Z content reached 30 wt.% when it started to decrease. The flexural strength was 14.9 MPa with WCP‐Z at 30 wt.%. In contrast, the flexural modulus of the composites increased continuously with increasing WCP‐Z content. The maximum flexural modulus was 1826 MPa with WCP‐Z at 40 wt.%. The composite material was submerged in 40 ppm of strontium solution. The concentration of Sr 2+ after 48 h was 29.8 ppm with WCP and 14.0 ppm with WCP‐Z. Therefore, WCP‐Z is a promising raw material that can be used in the fabrication of functional composites with absorption characteristics.
KANDA et al. (Tue,) studied this question.