IS 4851 -1987 Code Book PDF free download
This Indian Standard ( Second Revision ) was adopted by the Indian Standards Institution on 25 February 1987, after the draft finalized by the Cost Analysis and Cost Estimates Sectional Committee had been approved by the Civil Engineering Division Council. This standard was first published in 1968 and was revised in 1978 to incorporate certain modifications in Table 1 with a view to rationalizing the major operational characteristics and in this second revision Appendices A and B have been excluded. The method of calculation of depreciation and the estimated life of plant and machinery used in concrete is covered in IS : 11590 (Part I)-1986*. Unit rates of concrete available from various river valley projects in the country differ so widely in their structure that comparison of rates becomes impracticable. The variation in the unit rate of particular type of concrete occurs due to several factors, such as situation of work, wages of laborers, specifications of materials, cost of machinery and their repair charges, productivity, etc. It is, therefore, felt necessary to prepare a proforma for the estimation of the unit rate of concrete in such a manner as would take into account all the elements of costs that are expected to go into the item rate and present them in a uniform pattern so that the rates obtained in different projects can be compared and the item/items of operation showing differences is/are identified and understood. The proforma has been drawn up operation-wise, and, as such, the depreciation of machinery, wages of labor including supervisory labor, etc, have all been taken into account in the costs of various operations indicated in the proforma.There are different practices followed in the country in regard to inclusion of costs of shuttering and reinforcement in the computation of unit rate of concrete. The genera consensus was that since shuttering is a very important item a separate proforma should be brought out. Accordingly a separate standard IS: 10421-1983; has been prepared for computing the unit rate of shuttering.
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