Alkali-silica reactivity (ASR) is a problem for many States, particularly those with concrete pavements. This project provided education and technical assistance to State DOTs and the industry while showcasing SHRP-developed products relating to ASR and florescent microscopy.

This implementation effort includes identification of ASR, field and laboratory tests, mitigation of ASR in existing structures, and mix design procedures to reduce the potential for ASR. The showcase included workshops, testing equipment to State DOTs through an equipment loan program, and technical assistance.

This project is being closed out. The final report summarizing the accomplishments in this Showcase should be completed and available in the Spring of 1998. During this Showcase a total of 11 Showcases were presented, one Showcase was presented in each of the regions, one was made to the Corps of Engineers and one was presented in Canada. As part of the equipment loan program, the ASR field detection kits were loaned to over 20 state highway agencies. Field detection kits will still be available through the FHWA mobile concrete laboratory, see DP-75. Field testing of lithium compounds to minimize ASR is continuing in New Mexico, Nevada, New Hampshire, and Pennsylvania. Ten labs also participated in a round robin test for AASHTO TP- 14, "Standard Test for Accelerated Detection of Potentially Deleterious Expansion of Mortar Bars Due to Alkali-Silica Reaction" to develop a precision statement. The results of this testing will be included in the final report which should be completed in the Spring of 1998.

Workshops, equipment loans, and technical assistance through consultant services.

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HIGHWAYTECHNET   VIRTUAL EXPO   PAVEMENTS INDEX

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U.S. Department of Transportation
Federal Highway Administration