Abstract
In Morocco, Recycled Aggregate Concrete (RAC) is not promoted unlike developed countries like France, Canada, US and many others. This article aims to present a Moroccan study related to the characterization of RAC and compare it with several studies all over the world. It focuses on compressive strength as the main mechanical characteristic and the porosity as the physical property that affects durability. The protocol is based on crushing concrete from demolished building and producing aggregates that are used in making experimental samples of RAC with different percentages of replacing Natural Aggregates (NA) by recycled ones. The first part of experimental study is to determine compressive strength of these samples after 7, 21, 28 and 90 days of confectioning it. Test results prove that above 25% of replacement level, the compression drops considerably and the Recycled Aggregates (RA) can’t replace the naturel ones. The second part of studies focuses on studying porosity as indicator of durability according to the performance approach. It concludes that the RAC may be used in a construction with a required life of 100 years specially building and roads. For high standards constructions or construction in a specific environment, more studies should be done. Doi: 10.28991/cej-2021-03091768 Full Text: PDF
Highlights
Recycling aggregates is increasingly valuing in order to struggle with the shortage of natural resources and to comply with the sustainable development requirements
The protocol of experimental tests will focus on studying the compressive strength of concrete samples at different ages and different percentage replacements than determining the amelioration on this mechanical property when using additives specially adjuvants and testing the porosity of concrete to conclude about its durability
Experimental Tests Related to Compressive Strength of Recycled Aggregate Concrete (RAC)
Summary
Recycling aggregates is increasingly valuing in order to struggle with the shortage of natural resources and to comply with the sustainable development requirements. Even if there are no law or standards governing the use of RA in Morocco, several studies and researches are in progress to determine the influence of the replacement of NA by recycled ones on the concrete characteristics. The study of the concrete is based on two parameters: Compressive strength of concrete samples as an indicator of mechanical properties; Porosity as a physical parameter that influences durability based on the performance approach. The protocol of experimental tests will focus on studying the compressive strength of concrete samples at different ages and different percentage replacements than determining the amelioration on this mechanical property when using additives specially adjuvants and testing the porosity of concrete to conclude about its durability
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