Question: Problem 5 : An air - entrained concrete mix is to be proportioned for a reinforced concrete structure that would be placed under seaw ter

Problem 5:
An air-entrained concrete mix is to be proportioned for a reinforced concrete structure that would be placed under seawter. A required compressive strength, fcr', of 4.5ksi is specified. Placement conditions allow for concrete with a slump of 3 to 4in. The coarse aggregate is satisfactorily graded from No.4 to 1.5-in (nominal max size of 1.5-in) in accordance with ASTM C33 and has a dry-rodded weight density of 110lbft3. The coarse aggregates will be gravel with crushed particles. Determine the weight of proportions needed in a 1 cubic yard of concrete using the absolute volume method. What is the weight of ingredients needed for a laboratory trial batch of 0.01yd3? Material characteristics of the cement and aggregates are detailed in the table below.
\table[[Material characteristics,Cement,Fine aggregates,Coarse aggregates],[Bulk specific gravity,3.17,2.3,2.61],[Fineness modulus,-,2.5,],[Absorption (%),-,2.1,3.3],[Moisture content (%),-,1.6,41],[\table[[Dry-rodded unit weight],[(lbft3)
Problem 5 : An air - entrained concrete mix is to

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