How does the increase of maximum aggregate size used in the concrete mix design affect the percentage of fine aggregates needed for the mix? Explain why this is the case.

Based on the ASTM C33 standard for fine aggregate for Portland cement, what is the minimum percentage of aggregates that must pass the number 30 sieve in order to meet the ASTM standard?

A civil engineer wants to design a concrete mix design with the following criteria: Design a concrete strength: 25 MPa with a slump of 90 mm. Ignore the need for exposure Select a non-air entrained concrete Fine aggregates properties: Fineness modulus 2.67; Bulk specific gravity 2.66 Coarse aggregates properties: Maximum size aggregate of 25 mm with the bulk specific gravity 2.55 and dry-rodded mass 2000 kg/m3. Based on the criteria above 2.1. Calculate the required strength. 2.2. Calculate the water cement ratio. 2.3. Calculate the mix proportions of all materials including cement, water, fine aggregates, coarse aggregates, and air content for 1 m3.

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