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Freezing temperature protection admixture for Portland cement concrete
  • Published Date:
    1996-10-01
  • Language:
    English
Filetype[PDF-477.38 KB]


Details:
  • Publication/ Report Number:
  • Resource Type:
  • TRIS Online Accession Number:
    0073780
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ;
  • Abstract:
    A number of experimental admixtures were compared to Pozzutec 20 admixture for their ability to protect fresh concrete from freezing and for increasing the rate of cement hydration at below-freezing temperatures. The commercial accelerator and low-temperature admixture Pozzutec 20 served as the reference admixture for this project as it has been a successful product of Master Builders for winter concreting during the past several years. Over thirty-five

    experimental admixture candidates were tested. Of these, one experimental admixture, code-named EY-11, a nonchloride admixture, outperformed all the others and was selected as the admixture to be considered for future commercialization. It was demonstrated by laboratory evaluation that the Pozzutec 20 admixture did not contribute to corrosion of embedded steel reinforcement. The EY-11 admixture, although still under examination, also did not contribute to corrosion in a newer and different laboratory test. Based on a knowledge of its constituents, EY-11 is not expected to contribute to corrosion under laboratory conditions or in the field. The low and medium dosages (60 and 100 mL/kg [90 and 150 fl oz/cwt]), of EY-11 produced freeze-thaw-durable concrete, but the highest dosage examined, 160 mL/kg (240 fl oz/cwt), did not. The middle dosage (100 mL/kg) protected concrete down to the low-temperature goal of this project, 50C (230F). The prototype admixture, EY-11, affords superior low-temperature protection compared to existing accelerating admixtures, as well as good dura-bility. Unfortunately, it did not provide the desirable rapid setting and strength gain of concrete at above-freezing temperatures that field engineers and concrete technicians would like.

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