Advancing Sustainable Construction: Recycling Building Aggregatesfor Eco-Friendly Concrete Solutions in Benghazi, Libya

Abstract

In the last ten years in the city of Benghazi, Libya, it has been observed that the increase in rubble resulting from demolition and construction operations due to wars and destruction operations leads to an increase in this waste, which has become a new challenge to the local environment. Due to environmental reasons and the lack of natural resources, it is very important to recycle construction and demolition waste as much as possible. , Therefore, this study was conducted as a preliminary evaluation of the reuse of concrete aggregates from old and demolished buildings in concrete mixtures. Concrete aggregates were obtained from a building that is more than 20 years old, after crushing the reinforced concrete and sifting the crushed concrete to obtain the granular aggregate needed to make the concrete mixture, according to international specifications. , In this study, the focus was on the use of recycled aggregates in combination with natural aggregates in the concrete industry, and then five percentages of recycled aggregates were adopted ( 0%, 25%, 50%, 75%,
100% ), In this study, a number of tests were conducted on recycled aggregates, and these tests are (sieve analysis, specific gravity, absorption, abrasion, impact value and crushing value. Also, for comparison, the same tests were applied to natural aggregates. , To investigate the possibility of using recycled aggregates in the concrete industry. More than 15 samples of concrete cubes were prepared to conduct concrete tests such as (density and concrete operation for fresh concrete, and compressive strength within 3 days, 7 days, 28 days for hardened concrete) , Accordingly, and through the results obtained, we recommend the use of recycled aggregates in concrete mixtures, provided that it is used in ……. taking into account the necessary specifications in that.