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The carbon footprint of the concrete depends on several factors : the issue of materials
in the concrete , the concrete trace , energy consumption of the process and others.
It is known that approximately 90 % of the emissions of concrete are from the cement.
From this perspective , focusing on reducing emissions Welcome cement is the strategy that has
the greatest potential . So let us look more closely the concrete . The cement is basically
consisting of clinker and additions . production Clinker is responsible for most
CO2 emissions . Brazilian standards Cement divided into different types according
additions and the content of clinker . The strategy traditional to try to reduce the emission
concrete is to choose the type of cement which has the lowest content of clinker ( CP III or
CP IV ) , but this is not an absolute truth because the standard allows produce cements CP
II -E with lower clinker content . in this case you must know the specific content of clinker
of cement. Looking a little more closely, there is another problem with this strategy .
Today , in almost all the Brazilian market , there is plenty of slag and fly ash .
Increasing cement demand or a specific type of cement industry
he need to increase the content of clinker increasing CO2 emissions. In the end ,
to you in your work have a cement with lower content of clinker , other work will
to use a higher content of cement clinker . In other words , the choice of
type of cement can improve the balance of CO2 of the work , but not contributes to the decrease
of global emissions . There is another strategy , still little explored , which depends on the
Username : reduce the cement content in concrete. The amount of cement used for the concrete
the same resistance is highly variable , Data from 29 countries show that in concrete
Common from 20 to 40 MPa, the cement content arrives to vary by 100%. Between central concrete
Nearby , the differences can reach 35 % . The dosage volume , typically patch
increases the consumption of cement . It is possible formulate concrete with cement free
equivalent emissions using the concrete cement with 40% clinker . reduction
the cement content by packaging technology , cement containing limestone filler , reducing
the variation in production or the specification Concrete reduces always measured in the central
the CO2 footprint of the project and the country. in this scenario considers the reduced intensity
binders as the best strategy for reduce the CO2 footprint of concrete .