Hydraulic fracture test to determine aggregate freeze-thaw durability.
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2014-08-01
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Abstract:The freeze‐thaw durability of carbonate aggregates can vary greatly from durable to highly susceptible to freeze‐thaw distress. Using ; nondurable aggregate in concrete pavement exposed to freeze‐thaw cycles may lead to serious distress and greatly decrease the ; pavement’s service life. The testing needed to identify freeze‐thaw durable aggregates can take several months to complete. The main ; objective of this study was to develop a reliable, quick test method for determining the freeze‐thaw resistance of carbonate quarried ; aggregates in Indiana using the Hydraulic Fracture Test (HFT) equipment. ; ; Aggregate samples collected from 18 quarried carbonate sources from across Indiana that represented a range of freeze‐thaw ; performance were subjected to HFT using the existing MnDOT HFT equipment and the newly developed INDOT HFT equipment. ; Aggregates from the same sources also were used to produce concrete beams that were subjected to the INDOT modified AASHTO ; T161‐B freeze‐thaw test (ITM 210) which evaluates the dilation of concrete beams exposed to freeze‐thaw cycles. The experimental ; data were analyzed statistically and linear regression models were developed to predict the average percent dilation and the durability ; factor of freeze‐thaw test beams using parameters obtained from HFT results. Comparing the modeled and measured test results, the ; favored model predicts dilations based on the INDOT HFT results. These modeled dilations, when compared to measured dilations gave ; an adjusted R2 value of 0.85, indicating the model has a high degree of certainty. The modified INDOT HFT equipment, refined test ; procedures and data analysis developed during this study are recommended as screening tools for predicting AASHTO T161/ASTM C666 ; FT test results in 8‐days. Further testing is recommended to refine and validate the models before they are fully implemented as an ; acceptance standard.
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Main Document Checksum:urn:sha256:89f19ef2aeec220b3c8f0ed878d6c87702b65d62eab1f11510b94873e643e3b1