A trial concrete mix is to be prepared for a garage floor which is subjected to freezing. and deicing salts. The required strength is 32MPA, the driveway is 160mm deep and has no reinforcement. The largest aggregate size in our area that is economically available is 20mm. The concrete supplier performed testing on this mix previously and found the standard deviation of the strength is 1.5. What are the trial.mix criteria (exposure class, design strength, W/C, aggregate size, air content and slump) for this mix?

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Pressure and Stress