Influence of Pre-Saturation of Recycled Aggregates on Concrete Workability and Strength

Abstract:

This paper presents an experimental study to evaluate the influence of the water addition and pre-saturation of recycled aggregates (RA) on rheological and mechanicals properties of concrete. Quantities of water absorbed and their variations in times were measured according to the European standard (EN 1097-6). Two methods were tested: pre-saturate the aggregates and add them to other parameters making concrete or add water absorbed quantity to the mixing water. Replacement rate of natural aggregates (NA) 0%, 50% and 100% were studied. The results obtained showed that the gravels class 3/8 have a greater absorption capacity than the gravels class 8/16. Adding absorbed water during mixing have caused concretes segregations and an excess volume of water was observed at the surface of the concrete. The added water was not totally absorbed by aggregates. The pre-saturation of aggregates 24 hours before mixing and introducing them as a component in concrete was the best method. The initially saturated aggregates did not consume concretes mixture water. Workability by slump test and mechanical strengths developed with pre-saturated aggregates (100 % RA) and (50% RA - 50% NA) were measured on concretes, and then were compared to those of the reference concretes made with 100 % of natural aggregates.

• Periodical: International Journal of Engineering Research in Africa (Volume 42)
• Pages: 76-85
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.42.76
• Online since: April 2019
• Authors: Tourkia Guerzou, Abdelkader Mebrouki*, João Castro-Gomes
• Keywords: Mechanical Strength, Ordinary Concrete, Pre-Saturation, Recycled Aggregates, Water Absorption, Workability Strengths

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