corrections irs bridgecode

7/22/2019 Corrections IRS Bridgecode

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No.CBS/Codes/A&C Date :28.03.200629

All Principal Chief Engineers

i) Central Railway, M umbai CST-400 001

ii) Eastern Railway, Fairlie Place, Kolkata-700 001iii) East Central Railway, Hazipuriv) East-Coast Railway, Bhubaneshwar

v) Northern Railway, Baroda House, New Delhi – 110 001vi) North Central Railway, Allahabad

vii) North Eastern Railway, Gorakhpur-273 001viii) North Western Railway, Jaipurix) Northeast Frontier Railway, Maligaon, Guwahati – 781 061x) Southern Railway, Park Town, Chennai –600 003

xi) South Central Railway, Rail Nilayam, Secunderabad – 500 371

xii) South East Central Railway, Bilaspurxiii) South Eastern Railway, Garden Reach, Kolkata – 700 043xiv) South West Railway, Hubli

xv) Western Railway, M umbai – 400 020

xvi) West Central Railway, Jabalpur.

Sub : A&C Slip No. 9 for IRS Concrete Bridge Code regarding ConcreteStrength.

Ref : 1. Rly. Board’s letter No. 2006/CE-I/Br/PPC dt. 08.03.06

*******Vide above referred letter, Railway Board have approved certain modifications in

the provision of for IRS Concrete Bridge Code regarding Portland Pozzolana Cement and

Portland Slag Cement. Addendum & Corrigendum Slip No.9, dt. 27.3.06 incorporatingabove modifications is enclosed herewith for information and necessary action.

Encl : A&C Slip No.9SD/-

(Lalloo Singh)Executive Director / B&S

Government of India-Ministry of RailwaysResearch Designs & Standard organization

Lucknow - 226011



Government of IndiaMinistry of Railways

INDIAN RAILWAY S TANDARD CODE OF PRACTIC E FORPLAIN, REINFORCED AND PRESTRESS ED CONCRETE

FOR GENERAL BRIDGE CONSTRUCTION(CONCRETE BRIDGE CODE)

First Adopted –1936First Revision –1962

Second Revision –1997

ADDENDUM & CORRIGENDUM SLIP NO.9 Dated 27.3.06

1. Amend the following clauses as follows:

4.1.1 f) Replace “(See Note 1 & 4)” with “(See Note 1,4,5 & 6)”

g) Replace “(See Note 2 & 4)” with “(See Note 2,4, 5 & 6)”

4.1.1 NOTE 1 : Replace existing contents of Note 1 with the following:

“M ixing of 50% blast furnace slag with OPC cement at site shall not normally be

permitted. However, in except ional cases for bridges requiring higher levels of

durability using blended cement which is not available from manufacturersblending at site may be permitted subject to ensuring dedicated facilities and

complete mechanized process control to achieve sp ecified quality with the special

permission of Chief Engineer/Chief Bridge Engineer”.

4.1.1 NOTE 2: Replace existing contents of Note 2 with the following:

“Portland Pozzolana cement shall not be used for PSC works. When Portland

Pozzolana cement is used in plain and reinforced concrete, it is to be ensured that

proper damp curing of concrete at least for 14 days and supporting form work

shall not be removed till concrete attains at least 75% of the design strength”.



-2-

Add Notes 5 & 6 below Note 4

Note 5: Compatibility of chemical admixtures and super plasticizers with Portland

Pozzolana cement and Portland blast furnace slag cement shall be ensured by

trials before use.

Note 6: Some other properties of concrete such as modulus of elasticity, tensile

strength, creep and shrinkage are not likely to be significantly different. For

design purposes, it will be sufficiently accurate to take the same value as thoseused for concrete made with OPC.

BY ORDER

SD/-

(Lalloo Singh)

Executive Director/B&SLUCKNOW

Dated: 27.3.2006

corrections irs bridgecode

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