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8 maximum qualities

For an ideal sustainable construction material

2. Manufacture with zero carbon footprint

A carbon footprint is "the totality of greenhouse gases issued by direct or indirect effect of an individual, organization, event or product". (UK COAL TRUST 2008)


The increase in population and industrial activity have caused the concentration of CO2 in the atmosphere to increase 34% in the last century. The planet can only deal with a carbon footprint equivalent to an annual production of 1.7 Tm of CO2 per inhabitant. Nowadays the annual average production worldwide is 2,8 Tm of CO2 per inhabitant. Spain currently produces 6.4 annual Tm of CO2, that is to say, every inhabitant is responsible for 3,7 Tm of CO2 in excess.

Spain would need, depending on the current CO2 emissions and the population, a surface 3.7 times greater than the one it already has. But in addition we must bear in mind that not all the provinces of Spain have the same responsibility, given that there are 9 provinces (Cuenca, Zamora, etc) with environmental bioeficiency in surplus due to the high productive surface (Hag), and low industrial and population activity.

  • CO2 emissions in Spain are 52 % above the goal of Kyoto.
  • CO2 emissions represent 83.2 % of the total emissions of greenhouse gases ( ref. 2008). MARM INVENTARIO DE GASES DE EFECTO INVERNADERO. ED.2010.

  • Construction generates 36 % of the CO2 emissions in the European Union. VICECONSEJERO DE MEDIO AMBIENTE DE CYL.

  • Cement production is responsible for 14 % OF THE EMISSIONS (estimation of 2006, without counting the emissions for energetic consumption).CC.OO-DEPARTAMENTO DE MEDIO AMBIENTE, SANTAMARTA/ NIETO.


Climate change forces us to get rid of the problem progressively from the economic system, and to reduce the emissions of greenhouse gases between 60-80 % for the year 2050, according to the reports of the IPCC.


Global warming is a phenomenon that concerns everybody, because the concentration of greenhouse gases in the atmosphere is distributed evenly independently of where the emissions take place, contrary to other phenomena of air pollution.


Because of this, it is necessary to face the problem in a compound way. The Framework convention of the United Nations is the shared but differentiated responsibility. Industrialized countries have a higher responsibility in emissions of greenhouse gases both in quantity and in time.


Therefore, the efforts of reduction must be proportional to this responsibility and, logically, to the degree of development. (PLAN MARCO DE MITIGACIÓN DEL CAMBIO CLIMÁTICO EN CATALUNYA 2008 – 2012. SEPTIEMBRE 2008).

 

 

GeoSilex®, a lime obtained without CO2 emissions and minimum energy costs

Industrial limes, calcium oxide and calcium hydroxide, are obtained by the calcination of limestone (CaCO3) to temperatures between 800 and 1000°C, this reaction leads to the release of CO2 to the environment that contains (46 % of the weight of the limestone) and the generation of CaO, besides a considerable energy cost and the highest CO2 emissions eq. corresponding to the production of the electricity consumed or to the fuels used in the manufacture of the lime. The CaO in contact with water transforms into calcium hydroxide, Ca (OH) 2 or "hydrated lime".

 
Calcium hydroxide constitutes more than 80% in weight of the GeoSilex is obtained by a non conventional route followed during the hydration of Ca carbide, obtained from acetylene, the principal product, according to the following reaction: CaC2 + 2H2O → C2H2 + Ca(OH)2


In this reaction acetylene (C2H2) becomes detached and CaO is generated. Calcium oxide is hydrated rapidly forming a mixture (suspension) of calcic hydroxide. Normally this mixture of lime is not in used in construction or in other industrial uses of the traditional limes, and it is normally stored in pools as a residue. The recycling of the above mentioned mixture of lime as ligand of different elements of use in construction, according to the procedure patented by Geosilex Trenza Metal S.L., it is therefore an alternative of enormous added value and of great potential for the use of the above mentioned residue in the capture of greenhouse gases as CO2. “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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