Abstract
The foam index test is often performed to determine the air-entraining agent (AEA) dosage when fly ash is used in air-entrained concrete. However, hand-shaking and arbitrary chosen test parameters in the traditional test method lead to deviation between researches. In this paper, a horizontal shaker which can be easily obtained is used to provide automated agitation in a foam index test. The influence of shaking frequencies is investigated at first as the mode of shake is changed. Then, this research focuses on the influence of the water to cementitious materials ratio on foam index. By introducing a model paste consisting simulated pore solution and dead burnt MgO powder, several key factors are isolated. Analysis and discussion suggest that a prolonged shaking duration is more suitable for foam index tests. And by this prolonged method there exists good correlation between foam index and air-entraining agent dosages in fresh mortars.
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