A STUDY ON THE MIX DESIGN AND FUNDAMENTAL PROPERTIES OF CONCRETE PERFORATED BRICKS MADE OF RECYCLED AGGREGATES

摘要

In China, a huge quantity of construction and demolition (C&D) wastes are produced every year, the wastes are mainly composed of concrete rubbles or bricks. The disposal of the wastes has become a severe social and environmental trouble in the territory. The possibility of reuse these wastes in construction industry is thus of increasing importance. In this paper, the test results of mixture ratio of the concrete made of recycled aggregates (crushed concrete rubbles or crushed bricks) are given. The fundamental properties such as the compressive strength, the shrinkage ratio and the freezing-thawing characteristics of concrete perforated brick made of the recycled aggregates are tested and discussed in detail. The technological requirements to produce the concrete perforated bricks made of recycled aggregates molded with extrusion method are also discussed. It is indicated that the grade of concrete perforated bricks made of waste crushed concrete aggregates can reach MU15 or MU20, the grade concrete perforated bricks made of waste crushed brick aggregates can reach MU10 or MU15 according to the specifications of Chinese Code—"Code for design of masonry structure GB50003 - 2001". These concrete perforated bricks made of recycled aggregates may be used in the building of masonry structure.