Chemical Attack On Concrete - Determination of Aggressive Carbon Dioxide Content in Water
Chemical Attack On Concrete - Determination of Aggressive Carbon Dioxide Content in Water
Chemical Attack On Concrete - Determination of Aggressive Carbon Dioxide Content in Water
13577:2007
Chemical attack on
concrete
Determination of
aggressive carbon
dioxide content in
water
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BS EN 13577:2007
National foreword
BSI 2007
English Version
Attaque chimique du bton - Dtermination de la teneur en Chemischer Angriff an Beton - Bestimmung des Gehalts an
dioxyde de carbone agressif de l'eau angreifendem Kohlendioxid in Wasser
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13577:2007: E
worldwide for CEN national Members.
EN 13577:2007 (E)
Contents Page
Foreword..............................................................................................................................................................3
1 Scope ......................................................................................................................................................4
2 Normative references ............................................................................................................................4
3 Terms and definitions ...........................................................................................................................4
4 Principle..................................................................................................................................................4
5 Apparatus ...............................................................................................................................................4
6 Procedure ...............................................................................................................................................5
7 Expression of results ............................................................................................................................6
8 Test report ..............................................................................................................................................6
9 Precision.................................................................................................................................................6
Annex A (informative) Example of a test report - Determination of aggressive CO2 content .....................7
Bibliography ........................................................................................................................................................8
2
EN 13577:2007 (E)
Foreword
This document (EN 13577:2007) has been prepared by Technical Committee CEN/TC 104 Concrete and
related products, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by October 2007, and conflicting national standards shall be withdrawn at
the latest by October 2007.
This European Standard describes a method for testing water which may be aggressive to hardened concrete.
It is based on DIN 4030 "Assessment of water, soil and gases for their aggressiveness to concrete".
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.
3
EN 13577:2007 (E)
1 Scope
This European Standard specifies a reference method for the determination of carbon dioxide present in water
and which has a capacity to dissolve in lime from concrete.
If other methods are used, it needs to be shown, that they give results equivalent to those obtained by this
reference method.
This test does not apply to water that has a pH less than 4,3.
2 Normative references
Not applicable.
3.1
aggressive CO2
quantity of carbon dioxide present in water which has a capacity to dissolve lime in concrete
4 Principle
Calcium carbonate powder is added to water.
After the reaction of aggressive CO2 with calcium carbonate is complete, the water is titrated with acid.
The difference in titration with a second sample of the same water which has not been subjected to the reaction
with calcium carbonate will give the aggressive CO2 content of the water.
5 Apparatus
5.1.4 thermometer with a measuring range from 0 to 30 C and scale divisions of 0,2 C.
4
EN 13577:2007 (E)
5.2 Reagents
WARNING Hydrochloric acid is corrosive. Take precautions to avoid contact with the eyes or inhalation of
vapour. Prevent skin contact by wearing gloves and suitable protective clothing. If acid enters the eye or touches
the skin, wash it out thoroughly with clean water and seek medical treatment without delay.
6 Procedure
6.1 Preparations
Prior to sampling water 10 g of calcium carbonate powder shall be weighed and put into the 0,5 l bottle (5.1.8).
6.2 Sampling
Caution. Carbon dioxide is easily lost from water during sampling, transit and storage of samples.
Consequently, the water sample shall be taken with care not to remove the dissolved gas and shall be tested
as soon as possible after collection. Fill the sample bottle (5.1.7) with water to be tested. Then use this sample
bottle (5.1.7) to fill slowly the 0,5 l bottle (5.1.8) containing the 10 g of calcium carbonate powder which shall
be filled slowly, care being taken not to flush out the powder while filling. The bottle shall be completely filled,
hermetically sealed after collecting the sample and distinctively and permanently marked by the sampler with
the sample number, point of collection, sampling date and sampling time. The remaining water shall be kept in
the sampler bottle for the second measurement.
The composition of water sample shall not alter while it is being transported, e.g. due to change in
temperature. The change in temperature during transportation from the point of collection and testing in the
laboratory shall not exceed 5 C . The time between collection and determination of the aggressive CO 2
content, shall not exceed 48 h.
6.3 Testing
After sampling and just prior to testing, the temperature of the water shall be measured to the nearest 0,2 C
and reported in the sampling record. The 0,5 l bottle (containing the 10 g of CaCO3 powder) shall be
vigorously shaken for not less than 2 h.
Care shall be taken to ensure that the temperature of water does not vary by more than 2 C from the
temperature measured during collection from the temperature measured after sampling. If necessary the
magnetic thermo stated device shall be used.
100 ml of the sample water shall be titrated with hydrochloric acid to a pH value of 4,3.
5
EN 13577:2007 (E)
After the excess calcium carbonate has settled, 100 ml of the clear supernatant solution shall be titrated with
the hydrochloric acid to a pH value of 4,3.
Repeat the measurement with a second sample of the clear supernatant solution taken from the remaining
solution in the sample bottle (5.1.7).
7 Expression of results
7.1 Calculation
The lime dissolving capacity (LDC) of the sample is calculated from the equation:
The aggressive CO2 content of the sample is given by multiplying LDC by the ratio 44/56.
7.2 Result
The mean value of each determination from the two samples shall be taken as the aggressive CO2 content of
the water.
8 Test report
The report shall include:
i) declaration by the person carrying out the test that it was carried out in accordance with the standard
except as noted in h).
9 Precision
The standard deviation for repeatability is 0,3 mg/l.
6
EN 13577:2007 (E)
Annex A
(informative)
Test location
Test item
Sample identification: Date and time of collection:
Point of collection:
(borehole, pit etc.)
Depth of collection:
Result: mg/l
Except as detailed above this test was carried out in accordance with EN 13577
Technical responsibility
Signature:
Certificate identification:
7
EN 13577:2007 (E)
Bibliography
[2] ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic
method for the determination of repeatability and reproducibility of a standard measurement method
8
blank
BS EN
13577:2007
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