AIR-VOID STABILITY, PART II: INFLUENCE OF SUPERPLASTICIZERS AND CEMENT

Eighteen concrete mixes wre prepared to analyze the influence of superplasticizers on the stability of the air-void system during mixing and agitation. For each mix, four sets of samples were cast over a period of 90 min after initial water-cement contact. The modified point count method (ASTM C 457) was used to determine the characteristic of the air-void system on each set of samples. Results indicate that superplasticizers can cause a significant increase of the value of the spacing factor. This influence of superplasticizers was found to vary very significantly with the characteristics of the cement and also with the type of air-entraining admixture. A methodology similar to the one used in this study is recommended to assess the production and the stability of the air-void characteristics in relation to the composition of the mixes and materials that are used.

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  • Accession Number: 00491074
  • Record Type: Publication
  • Report/Paper Numbers: Title no. 86-M56
  • Files: TRIS
  • Created Date: Feb 28 1990 12:00AM