Air-Void Parameters Developed by Air-Entraining Admixtures, as Influenced by Soluble Alkalies from Fly Ash and Portland Cement

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Title: Air-Void Parameters Developed by Air-Entraining Admixtures, as Influenced by Soluble Alkalies from Fly Ash and Portland Cement

Author(s): Michael F. Pistilli

Publication: Journal Proceedings

Volume: 80

Issue: 3

Appears on pages(s): 217-222

Keywords: admixtures; air-entrained concretes; air-entraining agents; air entrainment;alkalies; fly ash; freeze-thaw durability; portland cements; solubility.

Date: 5/1/1983

Abstract:
This investigation concerns performance of two types of air-entraining admixtures in concrete containing higher-than-normal amounts of soluble afkaties. The high available-alkali levels were produced by increasing the amount of a Class C fIy ash, which has a high soluble alkali content. Data are also supplied showing the effect qf alkali content from Portland cement on the air-void system. Air-entraining admixtures were evaluated on the basis of their capacity to produce high-quality air-void parameters to insure better potential freeze-thaw durability of hardened concrete. The products containing neutralized VIIISO~ resin demonstrated a positive correlation between soluble alkali content and increased average chord intercept. Air-void parameters of the concrete containing specific types of suffonated hydrocarbons were considerably less affected by the available alkali contents.