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Hydraulic fracture test to determine aggregate freeze-thaw durability.

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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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    urn:sha256:89f19ef2aeec220b3c8f0ed878d6c87702b65d62eab1f11510b94873e643e3b1
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English
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