In one form, the present invention relates to a geopolymer cement which is a substitute for Portland cement. In one form, the present invention relates to a geopolymer cement which includes a solid component activator. However, the production of Portland cement concrete typically results in large carbon dioxide emissions and consequently has a large carbon footprint. In an attempt to address these shortcomings, other materials such as, for example, geopolymers have been used as a substitute for Portland cement.
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They possess high strength and a range of specific properties. They are called "geopolymers" because the raw materials used for their production are mainly minerals of geological origin. History French chemist Joseph Davidovits coined the term "geopolymer" in Examples of geopolymer cement used in construction can be found in Australia, Ireland, the United States, and Russia, to name a few.
For instance, in , an entire airport in Brisbane, Australia, was constructed with a concrete based on geopolymer binders. In the United States, special high strength geopolymer concretes have been used for airfield and road repairs.
Metropolitan tubings and elements of load-bearing structures are also produced. In Russia, the development of similar materials started in the s. Various objects were built, including civil and industrial construction. Examples include a residential house in Lipetsk, part of the railroad concrete ties in Moscow, a motorway in Magnitogorsk, and surfacing of the tank training battlefield near Chelyabinsk, to name a few. Technology The technology of geopolymer concrete is based on the idea of applying inorganic mineral substances, the production of which does not require the additional use of natural resources, and does not lead to CO2 emissions into the atmosphere byproducts of metallurgical, electrometallurgical industries and power plants.
Geopolymer concrete is chemically inert to a range of aggressive substances and remains sturdy in severe climates.
In comparison to traditional concrete production technology based on portland cement, geopolymer concrete has been shown to possess superior results in strength, durability, freeze-thaw resistance, fire resistance, heat insulation, corrosion, and aggressive substance resistance including some types of acids. Geopolymer cement can be formulated to re-use and recycle industrial byproducts.
Superior Waterproof Properties Excellent waterproof properties are achieved thanks to its inherent mesoporous structure. Fire Resistance Unlike ordinary portland cement-based concretes, water in geopolymer concretes easily evaporates not bound on a molecular level and does not explode the concrete from inside. Thermal Insulation Properties Materials and plasters using high-quality aggregates and geopolymer cement have superior thermal insulation.
This feature increases the construction speed. Utilisation of by-products Utilizes waste and byproducts of existing industries. High efficiency Higher-level compressive strength and axial tension strength, freeze-thaw resistance, water impermeability and resistance to abrasion in comparison to OPC. Cost effectiveness Speed of the project implementation increases due to fast strength development.
No additives or modifiers are needed.
WO2014075134A1 - Geopolymer cement - Google Patents
In News , Science The revenge of the ridiculed scientists. In September , my article Publish or Perish: the disease of scientific research highlighted how the Nobel Prize winners in Medicine had been forbidden for years to publish the results of their research, simply because they contradicted what was taught in the faculties world-wide, and accepted by the majority of the scientific community at that time. The recent Nobel Prize in Chemistry, Daniel Schechtman, experienced a situation even more vexing. Because he had the misfortune to make his discovery alone, without the help of other colleagues. Indeed, for the scientific authorities and institutions it is fashionable to proclaim that research is above all a team work. So that any individual discovery is suspect, subject to ridicule, worse, suspected of manipulation of results and scientific fraud. I have often quoted in my books the philosopher Schopenhauer : the establishment of the truth passes through three stages: during the first it is ridiculed, in the second it is resisted, in the third it is considered as self evident.