IS 455 portland slag cement - specification

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This standard was first published in 1953 and subsequently revised in 1962,1967 and 1976. This fourth revision incorporates the modifications required as a result of experience gained with the use of this specification and to bring the standard in line with the present practices followed in the production and testing of cement. 

Since publication of the third revision of this standard, large number of amendments have been issued from time to time in order to modify various requirements based on the experience gained with the
use of the standard and the requirements of the users and also keeping in view the raw materials and
fuel available in the country for manufacture of cement. The important amendments include incorporating a value of 28 day compressive strength, increasing the requirement regarding loss on ignition from 4’0 to 5’0, increasing the insoluble residue content from 2’5 to 4 percent, making autoclave soundness test compulsory, incorporating a provision for retest in respect of autoclave soundness test after aeration of the cement, incorporating a clause on false set of cement and permitting packaging of cement in 25 kg bags. In view of these large number of amendments, the Sectional Committee decided to bring out the fourth revision of the standard incorporating all these amendments so as to make it more convenient for the users. The desirable requirements of granulated slag suitable for the manufacture of Portland slag cement have been deleted from this revision and reference has been made to IS 12089 : 1987 ‘Specification for granulated slag for the manufacture of Portland slag cement’.

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