Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The current Minnesota Department of Transportation specification for coarse aggregate to be used in concrete pavements is based on either a maximum absorption of 1.75% (for Class B aggregate) or a maximum carbonate content of 30% by weight (for Class C aggregate). There is a concern that these specified limitations may reject potentially acceptable aggregates. This study is designed to evaluate the available methods for effectively characterizing the freeze-thaw (F-T) durability of aggregates. In this study, aggregates from 15 different sources in Minnesota were investigated. The experimental program included measuring the carbonate content, absorption, desorption, specific gravity, Iowa pore indices (i.e., primary pore index [PPI] and secondary pore index [SPI]), and pore size distribution of the carbonate and noncarbonate fractions.
The current Minnesota Department of Transportation specification for coarse aggregate to be used in concrete pavements is based on either a maximum absorption of 1.75% (for Class B aggregate) or a maximum carbonate content of 30% by weight (for Class C aggregate). There is a concern that these specified limitations may reject potentially acceptable aggregates. This study is designed to evaluate the available methods for effectively characterizing the freeze-thaw (F-T) durability of aggregates. In this study, aggregates from 15 different sources in Minnesota were investigated. The experimental program included measuring the carbonate content, absorption, desorption, specific gravity, Iowa pore indices (i.e., primary pore index [PPI] and secondary pore index [SPI]), and pore size distribution of the carbonate and noncarbonate fractions.
Carbonate Aggregate in Concrete
2015
66 pages
Report
Keine Angabe
Englisch
Road Transportation , Construction Equipment, Materials, & Supplies , Highway Engineering , Materials Degradation & Fouling , Concrete pavements , Aggregates , Carbonate content , Gravel roads , Freeze thaw durability , Low volume roads , Aggregate tests , Surface treating , Pore structure , Pore size , Durability , Minnesota , Primary Pore Index (PPI) , Secondary Pore Index (SPI) , Iowa pore index
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