Eco-Cement is a brand-name for a type of cement which incorporates reactive magnesia (sometimes called caustic calcined magnesia or magnesium oxide, MgO), another hydraulic cement such as Portland cement, and optionally pozzolans and industrial by-products, to reduce the environmental impact relative to conventional cement. A brand is a collection of Images and ideas representing an economic producer more specifically it refers to the descriptive verbal attributes and concrete symbols such as a In the most general sense of the word a cement is a binder a substance which sets and hardens independently and can bind other materials together Magnesia (Μαγνησία Magnisía, maɣniˈsia deriving from the tribe name Magnetes, is the name of the southeastern area of Thessaly Portland cement is the most common type of Cement in general usage in many parts of the world as it is a basic ingredient of Concrete, mortar, Stucco
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Energy Requirements
Ordinary Portland cement requires a kiln temperature of around 1450°C. The reactive magnesia in Eco-Cement requires a lower kiln temperature of 750°C[1], which lowers the energy requirements, and hence the use of fossil fuels and emission of carbon dioxide (CO2).
CO2 Sequestration
Eco-Cement sets and hardens by sequestering CO2 from the atmosphere and is recyclable. The rate of absorption of CO2 varies with the degree of porosity and the amount of MgO. Carbonation occurs quickly at first and more slowly towards completion. A typical Eco-Cement concrete block would be expected to fully carbonate within a year.
Waste Utilisation
Eco-Cement is able to incorporate a greater number of industrial waste products as aggregate than portland cement as it is less alkaline. In Chemistry, an alkali (from Arabic: Al-Qaly القلي القالي) is a basic, ionic salt of an Alkali metal This reduces the incidence of alkali-aggregate reactions which cause damage to hardened concrete. Alkali-aggregate reaction is a reaction which occurs over time in Concrete between the highly alkaline cement paste and non-crystalline Silicon dioxide, [2] Eco-Cement also has the ability to be almost fully recycled back into cement, should a concrete structure become obsolete.
References
Bibliography
- Wu, H. C. (1999). Advanced civil infrastructure materials. Science, mechanics and applications. Routledge.
- Day, K. W. (2006). Concrete Mix Design, Quality Control and Specification. Cambridge, Woodhead.
- Owen, Dyer (May 28), “A rock and a hard place”, The Guardian, <http://www.guardian.co.uk/society/2003/may/28/guardiansocietysupplement3>
External links
- ABC New Inventors Segment (Real Player)
- Discovery Channel (Canada) on Eco-Cement (Windows Media Player)
- Independant appraisals of the technology
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