A study for preventing the risk of alkali-silica reaction due to the aggregate planned to be used in mass concrete of Deriner Dam and HEPP project

Title: A study for preventing the risk of alkali-silica reaction due to the aggregate planned to be used in mass concrete of Deriner Dam and HEPP project
Author(s): Aydin Saglik, M. Fatih Kocabeyler
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 7
Language: English

Abstract: Deriner Dam and HEPP located in the north-eastern part of Turkey is being built on the river Coruh and when completed, will be the highest of Turkey and the fifth highest of the world with 252 m height from the base. Being built as a double curvature thin arched concrete dam, for about 4,000,000 m3 concrete casting will be accomplished in the dam’s body. The petrographical examination of the crushed aggregate intended to be used in mass concrete design has shown that the aggregate consisted of about 20% of reactive silica. Another source of the aggregate investigated was obtained from the intersection of Coruh and Berta rivers so called “Givit”. The latter is more reactive than crushed fine aggregate and actually not planned to be used in mass concrete but other concrete structures of dam construction. Moreover, the Portland cement, which could be used in mass concrete construction, contains alkalies over limit specified in the standard but mineral admixture (Catalagzi Thermal Power Plant, Class F Fly Ash) intented to be used for mass concrete has alkalies below the limits given in the standards. Particularly from the aggregate point of view, there is a serious potential risk of alkali-silica reaction (ASR) to occur in mass concrete. In this study, an experimental research programme has been carried out to reduce or even prevent the alkali-silica reaction. Two types of aggregate samples, one having for about 20% and the other having more than 30% reactive silica, were prepared for the test conforming to the grading requirements of ASTM C 1260 standard. As a result of the trials using fly ash with different percentages by replacement of cement, it was determined that the alkali-silica reaction was prevented significantly by fly ash usage of at least 25% with crushed fine aggregate and at least 35% with naturally shaped fine aggregate.

Online publication: 2004-03-25
Classification: Applications
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.079