Effect of saturation degree of recycled aggregates on concrete properties

Abstract

concrete imposes a significant effect on the environment due to the production of its components. Hence the direction today is targeted towards construction demolition waste and the methodology of enhancing the quality and quantity of recycled aggregates. this paper evaluates the implementation of crushed brick as coarse and fine aggregate for the replacement of natural aggregate in two separate water absorption conditions (7% air-dry and fully moist aggregates). the waste of crushed bricks was sieved and re-mixed in order to obtain the required gradation fractions (0-4; 4-8; 8-16; 16-32 mm). in different percentages, natural coarse and fine aggregates were substituted by crushed bricks aggregates (0, 55 and 75%). Laboratory tests were performed at the BME, Department of construction materials and technologies. Aim of the study is to examine some concrete properties (compressive strength, surface hardness and watertightness) for both natural and recycled aggregates implementation. results indicate a maximum reduction in compressive strength for fully saturated cases, higher reliability in case of 7% saturation for rebound values and a higher level of water penetration for maximum recycled aggregate application for fully saturated cases. (English) [ABSTRACT FROM AUTHOR]