SP 24 is a special publication from BIS as an explanatory handbook for IS 456-2000

SP 24:1978 [PDF] Download

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SP 24-1978 is a design aid for the Indian standard code of practice for plain and reinforced concrete, say IS 456-2000. This code is divided into 6 sections and 5 appendices, covering both, limit state design and working stress method as well.
You can download SP 24-1978 in pdf form here
SP 24-1978 provides a detailed explanation and could be used as a handbook for IS 456-2000

You can download relevant IS Codes from the following list.