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8 maximum qualities

For an ideal sustainable construction material

6. To cooperate with the rest of the materials to the major efficiency of the elements in which it is applied.

“In the long term, it was observed that the mechanical resistance of the cements with hydrated lime, was constantly increasing. It can be explained due to the capacity to carbonatise to hydrated lime; it is a slow process but in the end elements of great resistance and durability.”


Such studies at the beginning of the 20th century, as well as more recent studies have demonstrated that the addition of hydrated lime to concretes with cements Portland provides quite a series of advantages indicated as follows:


 a) As mentioned before, one of the most notable effects of the addition of the hydrated lime to the Portland cement is the increase in the plasticity and workability of the fresh mixture. This favors the setting of a material that sticks faster to the substrate and that reaches a greater compactness and impermeability(MINNICK, L.J. 1959. EFFECT OF LIME ON CHARACTERISTICS OF MORTAR IN MASONRY CONSTRUCTION. CERAMIC BULLETIN, 38, 239-245).


 b) One of the products of the setting of Portland cement is the calcium hydroxide, phase called portlandite, which can produce between 15 and 25% of cement (BACHE ET AL. 1966 MORPHOLOGY OF CALCIUM HYDROXIDE IN CEMENT PASTE. SYMP. STRUCT. PORTLAND CEMENT PASTE AND CONCRETE. SP. REPORT 90, 154-174). This phase contributes notably to the mechanical properties of the cement, but in addition it grants a high PH (about 12) to the same one. It contributes to the chemical stability of the long-term cement. Such effect is key in reinforced concretes, since at that PH the corrosion of the metallic elements is disabled. Nevertheless, the portlandite of the cement becomes carbonized with time, which can reduce its chemical resistance. The addition of hydrated lime to the cement promotes and lengthens the above mentioned effect, contributing to its durability.


 d) The presence of calcic hydroxide added to a cement Portland contributes to a major wetting of the above mentioned mixture. In fact, the high capacity of water retention of the hydrated lime favors a slow dry, which propitiates a better hydraulic setting.

The addition of GeoSilex to concretes with Portland cement gives the same mechanical advantages as traditional limes.


ADVANTAGES OF THE ADDITION OF GEOSILEX TO CONCRETES AND MORTARS.


Traditionally hydrated lime used as additive of the Portland cement was obtained from the burning of limestone (CaCO3) to temperatures between 800 and 1000°C, a reaction that produces CO2 emissions and CaO besides having a considerable energy cost.


The hydroxide of calcium constituting more than 80 % in weight of the GeoSilex® is obtained by a non conventional process followed after the hydration of Ca carbide, by a procedure patented by Trenzametal and the University of Granada.


This treatment allows us to turn the carbide limes into an improved product, of great added value and that forms the base of GeoSilex®, a material with excellent properties (rheology, mold, workability and facility of application) and enormous capacity to collect CO2, and with great potential as a cement material, without any of the disadvantages that carbide limes without optimizing might initially present.  “ADVANTAGES OF THE ADDITION OF GEOSILEX TO CONCRETES” CARLOS RODRÍGUEZ NAVARRO. CATEDRÁTICO DPTO. MINERALOGÍA Y PETROLOGÍA. UNIVERSIDAD DE GRANADA.

Materiales para arquitectura activa frente al CO2

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