Ecocem enables the binder to be recomposed in the concrete mixer and offers the possibility of adjusting the GGBS concentration according to the desired colour, strength and durability to suit the specifications of project owners and prime contractors and site constraints (transportation times, external temperatures, etc.).
From the appearance of the latest French standard on ready-mixed cement, NF EN 206-1/CN, the concept of cement has been replaced by the concept of equivalent binder. It is now usual to make up a binder equivalent to a CEM I cement (dosed with 95% clinker) or a CEM II (dosed with 85% clinker) and Ecocem GGBS.
Ecocem is added in the concrete mixer in the same way as grey cement, aggregate and water. Mixing can be carried out dry or with the addition of mixing water. As for cement, the weight allowance is 3%.
The quantity of equivalent binder from the French standard is defined by the formula Eq. binder=C + kA
C is the quantity of CEM I or CEM II cement per cubic meter of concrete in kg/m3
A : is the quantity of Ecocem per m3 of concrete used in the equivalent binder and the maximum value of which is defined by the ratio A/ (A+C) in the tables of Appendix NA.F for the various exposure classes.
K = 0,9. The k coefficient of Ecocem is recognised to be 0.9 i.e. that 100 kg of CEM I can be substituted by 111 kg of Ecocem. In reality, the performance of Ecocem could enable 100 kg of cement to be replaced by 100 kg of Ecocem which is what normally happens in Northern European regions. This is justified by the activity index at 28 days being > 0.9 and at 90 days > 1.
Ecocem is a class A GGBS. It is the only additive possible in the new category of concretes called “engineering concretes” in accordance with the recent concrete standard NF EN 206-1/CN.
The composition of these concretes is specifically designed for a project and a period given by the specifier.
These concretes are formulated on the basis of a preliminary study carried out under the responsibility of the specifier before the start of the construction operation involved and accepted by the concrete producer and user.
Its manufacture is subject to a specific compliance check defined in the quality plan for the structure and accepted by all parties concerned (user, specifier, producer).
This engineering concrete may be a concrete with specified properties (a BIPS) or a concrete with a specified composition (BICP). On the delivery note of the BPE, the letters BIPS or BICP must be shown explicitly.
According to table NA.F3 for BPE and NA.F4 for precast components, Ecocemis authorised in the equivalent binder in the following proportions:
The dosing of Ecocem is decided by the specifier. The specifier has the choice of specifying the concrete according to a best efforts obligation which equates to the doses from tables NA.F1 for the BPE, and NA.F2 from standard NF EN 206-1/CN for precast concrete components, or a duty to achieve the required result(s), a solution preferred for projects using a large volume of concrete. In this case, standard NF EN 206/CN offers the possibility of producing concretes using the performance-based approach, the concept of equivalent performance or engineering concretes.
Ecocem is used as grain modifier and active additive in the formulation of SCCs. The concentration of binder in a self-consolidating concrete (SCC) is of the order of 400 kg/m3, with a ratio of 20 to 40 % Ecocem. The quality of the SCC depends on the manufacture and the quality of the materials. The SCC may be improved with the use of fillerised sands or bonding agent admixes.
Ecocem is used as a component of the binder for roller-compacted cement (RCC). RCC is a fairly dry and firm mix of binder, aggregates and water. It is laid with vibratory rollers and does not use reinforcing steel. RCCs are technical-economical balance concretes which provide strength, impermeability, resistance to a high thermal gradient, little shrinkage due to the small quantity of water used and are easy to lay.
The composition of an RCC is generally the following:
RCCs are used mainly in the construction of dams, industrial floors, car parks and storage areas.
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The use of Ecocem helps reduce the impact on the environment of concretes due to the origin of the raw material, granulated slag, considered as a secondary material. Binder represents 85% of the CO2 emissions from concrete. Changing its composition by substituting Ecocem for CEM I or CEM II is therefore very efficient in reducing the CO2 inherent in the construction.
The environmental impact of binders in the concrete mixer is lower the higher the proportion of Ecocem.
ECOCEM France SAS - Horizon Sainte Victoire - Bâtiment A – Parc de la Duranne - 970, rue René Descartes - 13100 AIX EN PROVENCE
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