01158014

Component

The Texas Department of Transportation (TxDOT) has had its share of problems associated with alkali-silica reaction (ASR). Since its initial discovery in the early nineties, TxDOT has invested many resources in developing methods to prevent ASR in new concrete. Over the course of ten years, TxDOT has implemented a series of mixture design options geared towards mitigating ASR in concrete members. Although these mixture designs options have had much success in mitigating ASR, there have been some cases where the mitigation options were not sufficient. The case study discussed in this report includes a detailed investigation to determine potential cause of the early-age distress of precast concrete members. Concrete cores from seven precast members were taken and tested. It was concluded that even though the concrete mixtures used in these members met TxDOT’s ASR mitigation specifications, the cause of the cracking was due to the formation and expansion of ASR gel.

01147878

10-2558

English

12p

2010

Transportation Research Board 89th Annual Meeting

DVD

Figures (1) ; Photos (7) ; References (9) ; Tables (5)

Alkali silica reactions; Case studies; Concrete; Concrete curing; Concrete pavements; Cracking of concrete pavements; Precast concrete; Structural members

Texas

Highways; Materials; Pavements; I32: Concrete; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2010 Paper #10-2558

TRIS, TRB

Jan 25 2010 11:13AM