Epd For Cement Cem I
Epd For Cement Cem I
Epd For Cement Cem I
Declaration developed by
ECRA
European Cement Research Academy GmbH
Tannenstrasse 2
40476 Duesseldorf
Germany
The purpose of this EPD is to provide the basis for assessing buildings and other construc-
tion works. A comparison of EPD data is only meaningful if all the data sets compared were
developed according to EN 15804 and the product-specific performance characteristics and
its impacts on the construction works are taken into account.
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Product description
Cement
Cement is a hydraulic binder, i.e. a finely ground inorganic material which, when mixed with
water, forms a paste which sets and hardens by means of hydration reactions and process-
es and which, after hardening, retains its strength and stability even under water.
Use
Cement is mainly used as a binder for concrete, mortar or cement screed.
Manufacturing process
The most important component of cement according to EN 197-1 is clinker. It is produced
from raw materials such as limestone and clay which are crushed, homogenized and fed into
a rotary kiln. The raw materials are sintered at a temperature of 1450°C to form new com-
pounds. Clinker consists mainly of calcium, silicium, aluminium- and iron-oxides.
In a second phase calcium sulphates and possibly additional cementitious or inert materials
are added to the clinker. All constituents are ground leading to a fine and homogenous pow-
der.
The following figure is a schematic representation of the cement manufacturing process from
quarry to dispatch (production stage, information modules A1 to A3).
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In Portland cement (CEM I) the total of main constituents and minor additional constituents
is composed of 95-100 M.-% cement clinker and 0-5% minor additional constituents.
Based on the data provided by CEMBUREAU members in the context of the development of
this EPD, the following CEM I composition was assumed for the LCA model:
LCA Rules
Declared unit
The declared unit is 1 tonne of representative European Portland cement (CEM I) according
to EN 197-1.
Background data
The inventory analysis is based on
- available statistical information from CEMBUREAU, particularly related to produc-
tion volumes across Europe, raw materials and stack emissions (data from 2016)
- publicly available information from "Getting the Numbers Right"
[https://www.wbcsdcement.org/GNR-2016/], a database of CO2 and energy perfor-
mance information on the fuel mix, electricity consumption and CO2 emissions for
CEMBUREAU countries, covering 71% of the production volume of CEMBUREAU
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members (data from 2016). The independent third party service provider PwC runs
the database. This includes providing appropriate data quality checking procedures.
- data mining carried out among CEMBUREAU members. In the scope of this EPD
project, the national cement associations in France, Germany, Italy, Poland, Spain,
the United Kingdom and Turkey provided the background information at a national
level. For this purpose, a questionnaire was developed by ECRA and sent to con-
tacts in the respective countries. In 2016, the cement production volume in the sev-
en countries named above added up to approximately 74% of the total production
volume in CEMBUREAU countries.
The "GaBi ts" Software (version 9.1.0.53) and database were used for the LCA in this pro-
ject.
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Cut-off rules
The rules of EN 15804 apply.
The following processes were excluded from the LCA study:
• use of chromate reducing agents (total mass < 0.2% of cements)
• use of grinding balls (appr. 0.017 kg/t clinker)
The total of neglected input flows per module A1-A3 does not exceed the permitted maxi-
mum of 5 % of energy usage and mass.
Allocation rules
The rules of EN 15804 apply.
• In the case of blast furnace slag, a co-product from steel production used as a ce-
ment constituent, economic allocation was applied.
• In the case of fly ash, a co-product from electricity production used as a cement con-
stituent, economic allocation was applied.
• For artificial gypsum, allocated impacts from the joint process are neglected in the
cement LCA due to its very low impact.
Subsequent processes (e.g. granulation and grinding of blast furnace slag) were entirely
allocated to the co-products.
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LCA Results
SYSTEM BOUNDARIES (X = INCLUDED IN LCA; ND = NOT DECLARED)
Benefits and
Construction loads beyond
Product stage Use stage End of life stage
process stage the system
boundary
Construction installation
Waste processing
De-construction
Refurbishment
Manufacturing
Replacement
Maintenance
Recycling-
Recovery-
demolition
Transport
Transport
Transport
Disposal
potential
process
Reuse-
Repair
Use
A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 B6 B7 C1 C2 C3 C4 D
X X X ND ND ND ND ND ND ND ND ND ND ND ND ND ND
LCA Interpretation
PENRT
AP
GWP fossil
POCP
EP-terrestrial
EP-freshwater
EP-marine
PERT
While these factors may vary from country to country and from cement plant to cement plant,
the LCA indicators for CEM I cements in Europe are within a range close enough to justify
the application of the representative EPD for its intended use, i.e. providing the basis for the
environmental assessment of buildings and other construction works in typical European
situations.
For very detailed calculations requiring LCA data for specific cements, please refer to EPDs
from CEMBUREAU members or individual cement companies.
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Additional information
Chromate
Prolonged physical contact with non-low chromate cements can cause allergic skin reac-
tions. The REACH Regulation (EC 1907/2006) imposes requirements on the chromate con-
tent permissible for cement products. In line with this, only low chromate cements may now
be used for the manufacture of concrete and mortar if the possibility of physical contact with
these concretes and mortars during processing cannot be ruled out. The permissible chro-
mate content is less than 2 ppm, or 2 grams per tonne. Non-low chromate cements can now
only be used by processors with a closed production system where skin contact is not pos-
sible.
Carbonation
During and after the lifetime of concrete structures or other cement-containing products, hy-
drated cement contained within the product reacts with CO2 in the air. Part of the CO2 emit-
ted during cement production is reabsorbed by the cement through carbonation, a reaction
also referred to as cement carbonation. The quantity of CO2 taken up will depend on the
type of application and also its treatment after its lifetime. This reaction takes place mainly
on the surface of cement-based products. Structural concrete applications are designed ac-
cording to strict codes which ensure that carbonation at the concrete surface does not lead
to corrosion of reinforcement. Carbonation can nevertheless be particularly relevant after
demolition when the surface in contact with air increases very significantly. Carbonation con-
tributes to a reduced GWP impact of cement products over their whole life.
Since carbonation will depend on the application in question, please refer to the respective
PCR/EPDs for ready-mix concrete, precast concrete, mortar, cement screed or other ce-
ment-based products.
Installation of cement
Information on the safe and effective installation of cement can be obtained from the cement
supplier.
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References
ISO 14025:2011: Environmental labels and declarations — Type III environmental declara-
tions - Principles and procedures