Size. The nominal maximum size of aggregate shall be as large as possible within the limits specified but in no case greater than one-fourth of the minimum thickness of the member, provided at the concrete can be placed without difficulty so as to surround all reinforcement thoroughly and fill the corners of the form work. For most works, 20mm aggregate shall be used and where there is no restriction to the flow of concrete into sections, 40mm size (MSA) shall be used. For any heavily reinforced concrete members, the nominal maximum size of aggregate shall usually be restricted to 5mm less than the minimum cover to the reinforcement or 5mm less than the minimum clear distance between the main bars. Coarse aggregate shall of all aggregate particles of size greater than 4.75mm. The aggregate shall conform to IS: 383- 1970 clause 3.1,3.2 and 3.2.1 (Table-I) The nominal maximum size of coarse aggregate to be used shall be as per drawing/as determined by Engineer-in-charge.
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