Limitations on the use of aggregate sulfate soundness for the prediction of field performance of HMAC and seal coat pavement surfaces
Title:
Limitations on the use of aggregate sulfate soundness for the prediction of field performance of HMAC and seal coat pavement surfaces
Author:
Jayawickrama, Priyantha W.
Personal Author:
Publication Information:
[Lubbock, TX] : Texas Tech University, Dept. of Civil Engineering, [1992]
Physical Description:
vii, 79 p. : ill. ; 28 cm.
General Note:
Prepared for the Texas Dept. of Transportation.
"March 1992."
Contents:
Summary -- Implementation statement -- Introduction -- Literature survey -- Experimental study -- Field performance of aggregates -- Analysis of data and discussion of results -- Conclusions and recommendations -- References -- Appendices.
Abstract:
Investigation of the reasons for poor performance of hot mix asphalt concrete (HMAC) and seal coat surfaces in the Abilene District revealed that the pavement failure was due to high absorptivity of the aggregates used. The current requirement on the sulfate soundness (max. permissible 30%) has failed to identify and eliminate such absorptive, porous aggregates. The soundness tests performed in the district laboratories as well as tests performed in this study showed that the soundness loss for all the aggregates tested were well below the specifications. Review of available technical literature confirmed that although the sulfate soundness generally increases with increasing aggregate absorptivity, deviations from this general trend are not uncommon. Additionally, the study reviewed technical literature available on the use of sulfate soundness as a predictor of field performance of aggregates.
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