The engineering properties of high-performance recycled aggregate concrete (HPRAC) using the crushed brick, tile and hardened mortar to replace the coarse aggregate of concrete were studied. Three placement ratios by volume are 0%, 10% and 20%, respectively. Experimental results show…
The engineering properties of high-performance recycled aggregate concrete (HPRAC) using the crushed brick, tile and hardened mortar to replace the coarse aggregate of concrete were studied. Three placement ratios by volume are 0%, 10% and 20%, respectively. Experimental results show that, basically, the more the amount of recycled aggregate replacement is, the lower the corresponding engineering properties of concrete will be. The maximum reductions occur in compressive strength and surface electrical resistance where 27.5% and 37.7% reduction, respectively, were observed as compared with the control normal concrete specimens. On the other hand, the statistical analyses on the experimental results, including three-factor ANOVA and multiple regression analysis were also carried out. According the result of statistical study, the brick, tile and hardened mortar replacement are the significant factors on the performance of concrete, respec- tively. From the results of weight analysis, the brick aggregate replacement is the most significant factor in- fluencing the performance of HPRAC due to it lower specific weight and higher water apportion. 1 INTRODUTION of HPRAC. Due to a wide range variation of ma- 6 3 There are about 198×10 m of demolition terial properties of these recycled coarse aggregate, it waste produced from the construction activities dur- is anticipated that their effects on the resulting ing the years from 2004 to 2008 in Taiwan in which HPRAC would be profound too. On account for a about 15 percent of the waste belongs to the deposed deeper investigation into various extent of effects on plastics, wood, metal, paper, glass, etc.