History Interactions and Current Status of the Polymers in Concrete

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Title: History Interactions and Current Status of the Polymers in Concrete

Author(s): S. Chandra and Y. Ohama

Publication: Special Publication

Volume: 144

Issue:

Appears on pages(s): 483-506

Keywords: bridge decks; durability; freeze-thaw durability; plastics, polymers and resins; polymer concretes; Materials Research

Date: 3/1/1994

Abstract:
Polymers, once used historically in natural form, are today synthetically manufactured. Polymers are used in concrete in varying amounts or may be impregnated into hardened concrete. They interact with cement hydration products and create complexes, influencing the crystallization process during cement hydration and hindering the formation of large calcium hydroxide crystals during C 3S hydration. The mechanism of interaction is extensively reviewed. Polymers produce hydrophobicity in concrete and reduce its permeability. Because of this, the absorption of water, salt solution, and the like are substantially reduced. Subsequently, the corrosion resulting from salt ingress is decreased, extending the service life of the concrete. Durability properties such as freeze-thaw resistance and chemical resistance to inorganic acids are also significantly improved. Use of polymers is well known in the repair of bridges and parking decks, as well as in the restoration and conservation of monuments and historical buildings. Applications of polymer mortar and concrete and their recent developments are reviewed.