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UDC 666.944 : 543.062 : 620.1
IS0
I N T ERN AT I O N A L O R G A N IZ AT I ON FOR STAND AR D I ZAT I O N
IS0 RECOMMENDATION
R 863
POZZOLAN lClTY TEST
FOR POZZOLANIC CEMENTS
1st EDITION
October 1968
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For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
IS0 Recommendation R 863, Pozzolanicity test for pozzolanic cements, was drawn up
The
by Technical Committee ISO/TC 74, Hydraulic binders, the Secretariat of which is held by the
Institut Belge de Normalisation (IBN).
Work on this question by the Technical Committee began in 1958 and led, in 1964, to the
adoption of a Draft IS0 Recommendation.
In March 1967, this Draft IS0 Recommendation (No. 1156) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature,
by the following Member Bodies :
Argentina Hungary Romania
Australia India South Africa, Rep. of
Austria
Iran Spain
Belgium
Ireland Sweden
Brazil
Israel Switzerland
Chile
Italy Turkey
Colombia U.A.R.
Japan
Czechoslovakia Netherlands United Kingdom
Denmark New Zealand Yugoslavia
France Norway
Greece Poland
One Member Body opposed the approval of the Draft
Portugal
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in October 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 863 -1968 (E
IS0 Recommendation Octo ber 1968
POZZO LAN IC ITY TEST
FOR POZZOLANIC CEMENTS
1. SCOPE
This IS0 Recommendation defines the pozzolanicity test to be applied to pozzolanic cements which
conform to definition 6.1 of IS0 Recommendation R 597, Definitions and terminology of cements.
2. PRINCIPLE OF THE METHOD
In the test described, pozzolanicity is assessed by comparing the quantity of calcium hydroxide
present in a liquid phase in contact with the hydrated cement, with the quantity of calcium
hydroxide capable of saturating a medium of the same alkalinity.
NOTE. - In a pozzolanic cement, the concentration of calcium hydroxide in solution is always lower than the
saturation concentration.
Experiment shows that,using 20 g of cement per 100 ml of water at a temperature of 40 OC,
equilibrium is practically reached in seven days.
The application of the test thus requires knowledge of the solubility at 40 OC of calcium hydroxide
in a solution whose free alkalinity varies from zero to about one hundred milli-equivalents of strong
base (OH3 per litre.
3. REAGENTS
3.1 Distilled water,
3.2 Standard hydrochloric acid (0.1 N).
3.3 Ammonium hydroxide solution (0.5 N).
Ammonium oxalate, in saturated solution.
3.4
3.5 Methyl orange.
3.6 Potassium permanganate solution (0.05 N).
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