Evaluating Air-Entraining Admixtures for Highway Concrete (2007) / Chapter Skim
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28 Introduction The current AASHTO M 154 and T 157 specifications and test methods deal with uniformity and performance requirements for air-entraining admixtures. The procedures developed in this study primarily focus on modifying the performance requirements.
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29 • w/c of 0.40, and • Sand-aggregate ratio to achieve 1 to 3 in. slump.
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30 the strength reduction was associated with field-simulated conditions in the proposed protocols. Properties of the Selected Admixtures The following five air-entraining admixtures were selected for use in validating the proposed test procedure: • Admixture ES (Synthetic, Sodium Olfin Sulfonate)
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31 Mixture Designation Description AEA Cement Constant (pcy) Fly ash Constant (pcy)
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32 Comp. 7 da Mixture Designation y 28 da y Flex.
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33 The difference in strength values between concrete prepared with the admixtures and reference concrete (control) ranged from 50 to 100 percent.
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34 conditions are more rigorous than those proposed in the current standard. To confirm such effect, two of the tested admixtures (ED and EV)
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