THE FORMATION OF RIMS ON DOLOMITE AGGREGATE IN IOWA HIGHWAY CONCRETE

Rims have formed on the margins of dolomite (Ca,Mg(CO3)2) aggregate in Iowa highways due to dedolomitization reactions between aggregate and concrete paste. These dedolomitization reactions are usually accompanied by a volume change, due to a conversion of dolomite to a calcitic dolomite, that results in the development of micro-cracks in the aggregate and the concrete paste. These cracks become channelways for solutions, often saline in nature due to the application of deicing salts, that result in further deterioration of highway concrete. Rim development on aggregate particles commonly results in highway concretes with short service lives. The ability to distinguish dolomites that are susceptible to deterioration from those that are less likely to deteriorate should save expenditures since highway maintenance costs will be reduced.

Language

  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 8-12

Subject/Index Terms

Filing Info

  • Accession Number: 00721832
  • Record Type: Publication
  • ISBN: 0065231003
  • Files: TRIS, STATEDOT
  • Created Date: Jun 3 1996 12:00AM