A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Preventing Alkali-Silica Reaction and Delayed Ettringite Formation in New Concrete
The state of Texas has been widely impacted by materials-related distress in various transportation structures. This distress has been mainly attributed to alkali-silica reaction (ASR) and delayed ettringite formation (DEF) and has been commonly referred to by the Texas Department of Transportation (TxDOT) as premature concrete deterioration. In response to these problems, TxDOT has aggressively sought to prevent cases of this distress in new concrete structures by implementing new ASR specifications (initially as TxDOT Special Provision to Item 421). This specification, and updates since, requires contractors to address ASR through prescriptive options (e.g., 20-35 percent Class F fly ash) or performance testing. The research detailed in this summary report was performed in support of this new specification, with the intention of improving upon the initial specification efforts and increasing the service life of transportation applications.This summary report briefly summarizes the overall findings of TxDOT Project 0-4085, Preventing ASR and DEF in New Concrete. This research project, conducted at the Concrete Durability Center (CDC) at The University of Texas at Austin, took 4 years, with an emphasis on both laboratory and field evaluations. A more detailed description of this study can be found in the report 0-4085-5.
Preventing Alkali-Silica Reaction and Delayed Ettringite Formation in New Concrete
The state of Texas has been widely impacted by materials-related distress in various transportation structures. This distress has been mainly attributed to alkali-silica reaction (ASR) and delayed ettringite formation (DEF) and has been commonly referred to by the Texas Department of Transportation (TxDOT) as premature concrete deterioration. In response to these problems, TxDOT has aggressively sought to prevent cases of this distress in new concrete structures by implementing new ASR specifications (initially as TxDOT Special Provision to Item 421). This specification, and updates since, requires contractors to address ASR through prescriptive options (e.g., 20-35 percent Class F fly ash) or performance testing. The research detailed in this summary report was performed in support of this new specification, with the intention of improving upon the initial specification efforts and increasing the service life of transportation applications.This summary report briefly summarizes the overall findings of TxDOT Project 0-4085, Preventing ASR and DEF in New Concrete. This research project, conducted at the Concrete Durability Center (CDC) at The University of Texas at Austin, took 4 years, with an emphasis on both laboratory and field evaluations. A more detailed description of this study can be found in the report 0-4085-5.
Preventing Alkali-Silica Reaction and Delayed Ettringite Formation in New Concrete
K. J. Folliard (author) / R. Barborak (author) / T. Drimalas (author) / L. Du (author) / S. Garber (author)
2006
4 pages
Report
No indication
English
The effect of delayed ettringite formation and alkali-silica reaction in of concrete microstructure
| British Library Online Contents | 2010