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है”ह”ह

IS 6932-2 (1973): Method of test for building limesDetermination of carbon dioxide content [CED 4: BuildingLimes and Gypsum Products]

IS: 6932 ( Part II ) l 1973

Indian Standard

METHODS OF TESTS FOR BUILDING LIMES

PART II DETERMINATION OF CARBON DIOXIDE CONTENT

( Third Reprint APRIL 1993 )

UDC 691’51 : 543 [ 546’2641

Gr 1

0 Copyrfghf 1974

BUREAU OF INDIAN STANDARDS MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MAR0

NEW DELHI 110002

February 1974

.

AMENDMENT NO. 1 MAY 2010 TO

IS 6932 (PART 2) : 1973 METHODS OF TESTS FOR BUILDING LIMES

PART 2 DETERMINATION OF CARBON DIOXIDE CONTENT

(Page 1, clause 2.1, line 2) ― Substitute ‘IS 712 : 1984†’ for ‘IS : 712-

1973†’.

(Page 1, clause 2.2, line 1) ― Substitute ‘IS 1070 : 1992‡’ for ‘IS : 1070-1970‡’.

(Page 1, footnote marked †) ― Substitute the following for the existing: ‘†Specification for building limes (third revision).’

(Page 1, footnote marked ‡) ― Substitute the following for the existing: ‘‡Specification for reagent grade water (third revision).’

(Page 2, clause 3.1.2, line 2) ― Substitute ‘IS 265 : 1993*’ for ‘IS : 265-1962*’.

(Page 2, footnote) ― Substitute ‘(fourth revision)’ for ‘(revised)’. (CED 4)

Reprography Unit, BIS, New Delhi, India

IS : 6932 ( Part II ) - 1973

Indian Standard METHODS OF TESTS FOR BUILDING LIMES

PART II DETERMINATION OF CARBON DIOXIDE CONTENT

0. FOREWORD

0.1 This Indian Standard ( Part II ) was adopted by the Indian Standards Institution on 22 March 1973, after the draft finalized by the Building Limes Sectional Committee had been approved by the Civil Engineering Division Council.

0.2 Hitherto, methods of tests for assessing qualitative requirements of building limes were included in IS : 712-1964. For facilitating the use of these tests it has been decided to print these tests as different parts of a separate Indian Standard. This part covers determination of carbon dioxide content of building limes.

0.3 In reporting the results of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done ina ccordance with IS : 2-1960*.

1. SCOPE

1.E This standard ( Part II ) covers ‘method of test for determination of carbon dioxide content of building lime.

2. GENERAL

2.1 Preparation of the Sample - The sample for carrying out this test shall be prepared in accordance with 7.2 of IS : 712-19737.

2.2 The distilled water ( see IS : 1070-1970: ) shall be used where use of water as a reagent is intended.

*Rules for rounding of numerical values (revised). tspecification for building limes ( second revision ).

fSpecification for water, distilled quality ( revised ). (Since rev&Cd ).,

Q Copyright 1974

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

. .

-.. .___. ‘-.l__ __1--..--_ -- ..--~ --.. _-_

.._.

IS : 6932 ( Part II ) - 1973

3. DETERMINATION OF CARBON DIOXIDE CONTENT

3.1 Apparatus and Reagents

3.1.1 A suitable form of apparatus is shown in Fig. 1. The system consists of a U-tube A with anhydrous granulated calcium chloride and another U-tube B with soda asbestos, funnel C with a glass stopcock S and a bent inlet glass tube ( projecting below the acid level ) is used to introduce hydrochloric acid into the generating flask D. Condenser E condenses most of the water and hydrochloric acid. The U-tube F contains zinc pallets to react with residual acid, if any. acid to absorb moisture.

Bubbler G contains concentrated sulphuric The U-tube Hr contains pumice stone,

impregnated with anhydrous copper sulphate to remove traces of hydrogen sulphide. Pumice stone is prepared by crushing it to approximately 5 mm size, shifting it free from dust and then transferring 60 g of it to a casse- role, it is then covered with a concentrated solution of 30 to 35 g of copper cr,lnhatc= snrl thm c=vannratd tn rlr,m~.~ while et;rr;no. rr\n.t~ntlvr “u’y”‘“‘” I-*- I._.,._ Y. ..y”.e‘“L. I.2 u. ,.A.&” ..AIII” “.A”“‘~ ~“~“‘“““~. It is then heated for 3 to 4 hours at 150 to 16O”C, cooled in a desiccator and preserved in a glass-stoppered bottle. U-tube H contains anhydrous granu-’ lated calcium chloride in one limb and anhydrous magnesium perchlorate in the other to remove the last traces of moisture. U-tubes J1 and J contain both soda asbestos and anhydrous magnesium perchlorate in each limb to absorb carbon dioxide. U-tube X contains anhydrous granulated calcium chloride and anhydrous magnesium perchlorate in each limb to protect the end of the train against moisture. U-tubes are suspended from a cross. bar Jv. Two retort stands L and M carry the cross bar N. All joints are made of stout-walled rubber tubing with the ends of the glass tubes touching each other. Means are provided to pass air through the system either under pressure or by suction.

n * n n., 1. TT, ,.I...‘. “.., 1 i 1 I. I \ T. 1 _I11 3.1 .L uziuce nyarocruonc ficta - I . * t v/v I. 11 snarl oe prepared by diiu&

ing hydrochloric acid ( sp gr l-16 and conforming to IS : 265-1962* ) four times its volume with water.

3.2 Procedure-Accurately weigh about 2.5 g of the sample, transfer it into the flask D and add 20 to 40 ml of distilled water. Insert the glass stopper carrying the funnel arrangement and condenser and make sure that the apparatus is air-tight. Pass air through the system until the carbon dioxide absorption tubes J, and J attain constant mass. Close the stopcock ( Sand reconnect in the system the weighed carbon dioxide absorption tubes Jr and J. Introduce 40-m’ of hydrochloric acid into the flask D through funnel C and heat the flask carefully so that the gases pass through the sulphuric acid bubbler at a moderate rate. Allow the contents of the flask to boil after about 30 to 40 minutes. After 2 to 3 minutes of boiling, remove the flame and connect the flask to scrubbers A and B by means of stopcock S and pass air through the system for 20 minutes at a moderate rate. Keep

*Specification for hydrochloric acid ( ret&d ) .

2

-5 -

FIG. 1 ASSEMBLY OF APPARATUS FOR DETERMINATION OF CARBON DIOXIDE IN LIME

IS : 6932 ( Part II ) - 1973

the absorption tubes J1 and J at room temperature for 30 minutes and then weigh. The increase in mass denotes the carbon dioxide content in the sample.

3.3 Report of Test Results-The carbon dioxide content shall be reported as a percentage of mass of the sample taken.

4

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