INNOVATIONS IN IMPREGNATION TECHNIQUES FOR HIGHWAY CONCRETE

Corrosion of reinforcing steel due to the penetration of deicing salts poses a considerable problem in bridge decks. One approach that has received much attention has been impregnation of the bridge deck with a liquid monomer followed by polymerization to effectively seal the capillary pores against salt intrusion. This approach is technically feasible in the field. The present impregnation techniques, however, are costly in terms of energy, materials, and time, and simplifications and improvement would be desirable. In this paper, results are described of preliminary experiments with sulfur, tar, and mixtures of the two as surface impregnants and with a pressure-mat technique for mechanically assisting monomer or sealant penetration. It is shown that the impregnation of portland cement concrete and mortar by molten sulfur, tar, and an 80:20 mixture of the two yields significant reductions in moisture absorption and increases in strength and that, in the case of concrete slabs, predrying may not be necessary. It is also shown that pressure mechanically applied to patterned rubber mats can effect uniform impregnation with a monomer such as methylmethacrylate or with a sealant such as tar or linseed oil. Such an impregnation could conceivably be effected by using rollers. Thus, initial feasibility of two potential improvements in concrete impregnation processes has been demonstrated.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 29-40
  • Monograph Title: Polymer concrete
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00127400
  • Record Type: Publication
  • ISBN: 0309023955
  • Files: TRIS, TRB
  • Created Date: Dec 3 1975 12:00AM