A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Selection of Siliceous Aggregate for Concrete
Alkali-aggregate expansive reactions are one of the potentially serious degradation problems that could affect the structural stability of underground concrete structures for disposing of low-level radioactive waste (LLW). It appears that all aggregates react to some degree with alkalies in cement. In the majority of cases the reactions are beneficial (e.g., increasing the bond between aggregate and hydrated cement paste) or innocuous. In some cases, however, the reactions result in the formation of expansive products which can cause serious cracking of the concrete. The report deals with the selection of siliceous aggregates to avoid deleterious alkali-aggregate expansions. Current practices used to prevent expansive alkali-silica reactions and the standard test methods used to identify reactive aggregates are first discussed. Then the results of a study on using a new alkali-silica reactivity test to select siliceous aggregates for use in the concrete of LLW storage structures are presented. It is recommended that siliceous aggregates, selected for constructing underground vaults for disposal of LLW, have an expansion of less than 0.10% using the new test.
Selection of Siliceous Aggregate for Concrete
Alkali-aggregate expansive reactions are one of the potentially serious degradation problems that could affect the structural stability of underground concrete structures for disposing of low-level radioactive waste (LLW). It appears that all aggregates react to some degree with alkalies in cement. In the majority of cases the reactions are beneficial (e.g., increasing the bond between aggregate and hydrated cement paste) or innocuous. In some cases, however, the reactions result in the formation of expansive products which can cause serious cracking of the concrete. The report deals with the selection of siliceous aggregates to avoid deleterious alkali-aggregate expansions. Current practices used to prevent expansive alkali-silica reactions and the standard test methods used to identify reactive aggregates are first discussed. Then the results of a study on using a new alkali-silica reactivity test to select siliceous aggregates for use in the concrete of LLW storage structures are presented. It is recommended that siliceous aggregates, selected for constructing underground vaults for disposal of LLW, have an expansion of less than 0.10% using the new test.
Selection of Siliceous Aggregate for Concrete
J. R. Clifron (author) / L. Knab (author)
1990
22 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Radioactive Wastes & Radioactivity , Alkali aggregate reactions , Concretes , Aggregates , Alkalies , Dissimilar materials bonding , Cements , Concrete structures , Masonry , Silicate cements , Corrosion environments , Durability , Radioactive waste disposal , Low-level radioactive wastes
A preparing method of burn-free siliceous shale aggregate composite bonded concrete
| European Patent Office | 2015
Coupled Heat and Mass Transport Phenomena in Siliceous Aggregate Concrete Slabs Subjected to Fire
| Online Contents | 1997
Coupled Heat and Mass Transport Phenomena in Siliceous Aggregate Concrete Slabs Subjected to Fire
| British Library Online Contents | 1997
Equation for Thermal Profile of Normal Strength Siliceous Aggregate Concrete Columns Exposed to Fire
| British Library Conference Proceedings | 2008