Figure 61: Tmt Bars Location

Figure 55:MATERIAL REQUISITION FLOWCHART

3 4 . 2 S T O R E M A N A G E M E N T

He also has to maintain a record of the quantity of the incoming materials & materials left in the store.To make any kind of purchase of the material, the store manager does a complete market study of the material, with at least 3 quotations (varies with project to project) with him, before he can order.The quotation to be chosen depends not only the minimum rate, but also on the duration of delivery, experience, current commitments and material quality as well. The process of store management is

Table 34: STORE MANAGEMENT FLOWCHART

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M A T E R I A L S P E C I F I C A T I O NS D E T A IL S

CE M E N T : O P C 5 3 O R D I N AR Y P O R TL A N D C E M E N T

IS(INDIAN STANDARD) to IS: 269, IS: 8112-1989 and IS: 12269-1987

CPWD Specification, 2019

3.1.2, Pg. 66

3 4 . 3 C E M E N T

 Ordinary Portland cement (OPC) of 33 grade, 43 grade and 53 grade conforming to IS: 269, IS: 8112-1989 and IS: 12269-1987, respectively, shall be used.  Portland pozzolana cement (PPC) conforming to IS:1489 may also be used.  Sulphate- resistant Portland cement conforming to IS:12330 for structural elements exposed to soil may also e used.  For foundation and substructure, the Engineer may direct the OPC substitution by Blast Furnace Slag Cement confirming to IS:455.Portland Pozzolana cement (flyash based) conforming to IS 1489 (Part 1)-1991. Cements of 43 and 53 grades conforming to IS:8112 and IS:12269 respectively may be used provided the minimum cement content mentioned elsewhere from durability considerations, is not reduced.Cement conforming to IS:8041 shall be used only for precast concrete products after specific approval of the Engineer .Total chloride content shall be 0.1 percent by mass of cement for the cement to be used in structures other than prestressed concrete structures and 0.05% by mass of cement in prestressed concrete structures.

Also, total sulphur content calculated as sulphuric anhydride (SO) shall in no case exceed 3.5

percent58 .

Where chloride is encountered along with sulphates in soil or ground water, ordinary Portland cement with C3A content from 5 to 8 percent shall be preferably used in concrete, instead of sulphate resisting cement.

Setting Time: Setting time of cement of any type of any grade when tested by Vicat apparatus method described in IS 4031 (Part-5)-1988 (Reaffirm-2014) shall conform to the following requirement:  Initial setting time: Not less than 30 minutes  Final setting time: Not more than 600 minutes

Cement in bags in local storage for more than 3 months after completion of tests, may be re-tested for compressive strength and setting times (initial and final) before use and may be rejected if it fails to conform to any of the requirements.

Lot size for independent testing of cement at site shall be the quantity received at site on any day, subject to a maximum of 500 tonnes.

58 https://cpwd.gov.in/Publication/Specs2019V1.pdf

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