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- W18737550 abstract "At present, all limestone aggregates to be used in Florida Department of Transportation (FDOT) projects fall under a single category and must meet the same set of minimum durability requirements. For example, a limestone aggregate mine which could not produce aggregates with a maximum Los Angeles (LA) Abrasion Loss of 45% would not be approved by FDOT. This research project was conducted to investigate the feasibility of using some aggregates which do not meet the current FDOT aggregate specifications in some concrete applications and to develop tiered aggregate specifications for use by FDOT. A laboratory testing program was conducted to evaluate the properties of concrete made with aggregates which do not meet current FDOT aggregate specifications and to compare them with those made with aggregates which meet the current FDOT specifications. Ten different aggregate sources were selected for use in this study. They included two control aggregates which met the 2010 FDOT aggregate specifications and eight aggregates which did not meet at least one of the aggregate specification requirements. The required aggregate properties which were not met included the maximum allowable LA abrasion loss, percent passing No. 200 sieve, and shell content. Based on the results from this study, a developmental three-tier aggregate specification is recommended for use by FDOT. The first tier (Category A) aggregate would have the same requirements as the current FDOT aggregate specifications. The second tier (Category B) and third tier (Category C) aggregates have relaxed requirements in maximum allowable LA abrasion loss, sodium sulfate soundness loss, and materials passing No. 200 sieve. Possible uses for Category B aggregates include all nonstructural concrete applications, manholes, inlets, and junction boxes. Category C aggregates are recommended only for non-structural concrete applications. Results of analysis in this study indicate that Category B aggregates can possibly be used in concrete pavement application. Further study to evaluate the suitability of using Category B aggregates for concrete pavement and precast concrete pipe applications is recommended." @default.
- W18737550 created "2016-06-24" @default.
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- W18737550 date "2012-03-01" @default.
- W18737550 modified "2023-09-27" @default.
- W18737550 title "Development of Tiered Aggregate Specifications for FDOT Use" @default.
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