Underwater concreting by using two-stage concrete (Laboratory study)

Author(s): H.S. Abdelgader, A.S. El-Baden
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 471- 472
Total Pages: 2
Language: English

Placement of concrete underwater is necessary in the implementation of most in-shore, and off-shore structures. The pouring of underwater concrete is considered as a challenge for engineers, even during the design stage or during implementation and supervision. This is due to the fact that many precautions must be taken for the success of casting process. The most important precaution is to protect the fresh concrete during the casting process from the water to avoid the risk of washout of cement paste and segregation of aggregates. Concrete can be placed underwater successfully through good design of concrete mix, and through choosing the most suitable method for placing. There are new techniques for underwater concreting such as grouted aggregate which is known as Two-Stage Concrete (TSC) method. The main objective of the paper is to present the possibility of pouring the concrete underwater by using (TSC) method. A laboratory model was prepared and visually investigated and tested by extracting core samples, performing compressive tests, tensile tests and ultrasonic pulse velocity tests. From the obtained results it has been observed that, it is possible to pour concrete underwater by using two stage concrete in successful way, and it is recommended to develop this research by using different water cement ratios and cement sand ratios to get the optimum mix design and also, different types of aggregates which are available in local quarries.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00