2015 CSCE Annual Conference Regina - Building on our Growth Opportunities

2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference


Title
INCORPORATION OF LIGHTWEIGHT AND RECYCLED AGGREGATES FOR CONCRETE CURING

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Author(s)
Mr. Mohamed El Ghonemy, The American University in Cairo
Mr. Ahmed Hammam, The American University in Cairo
Ms. Mariam Ismail, The American University in Cairo
Mr. Marwan Roushdy, The American University in Cairo
Dr. Mohamed Abdel Raouf, The American University in Cairo
Dr. Mohamed Abou-Zeid, The American University in Cairo (Presenter)
Dr. Ezzat Fahmy, The American University in Cairo
Abstract

Adequate curing of concrete is a fundamental step in concrete manufacturing to meet performance and durability requirements. Internal curing is an emerging technique that can provide water to concrete for extended durations towards thorough hydration of the cement and reduced cracking. This work addresses potential use of two types of aggregates for internal curing. Perlite light weight aggregates as well as recycled concrete aggregates were incorporated at three dosages each to replace the coarse aggregates.

Conventional concrete mixtures were prepared as fully cured by water, cured by a curing compound and with no curing. Fresh concrete and hardened concrete properties were evaluated including slump, unit weight, compressive and flexural strength as well as shrinkage. The results reveal that the incorporation of pre-wetted/saturated lightweight aggregates can lead to a significant enhancement in concrete workability and durability through reduced shrinkage.