Archive for October, 2011

“Breakthrough Innovation in High Temperature Materials
Pyromeral Systems develops and manufactures advanced materials and composite parts for applications requiring resistance to high temperatures or fire barrier. Our unique technologies based on innovative inorganic polymers and glass-ceramic matrices are designed for continuous exposure to temperatures as high as 1000°C (1800°F). They provide convenient, lightweight and durable solutions for industrial processes, motorsports and aerospace applications. Pyromeral Systems brings a smart alternative when conventional composites, metals or ceramics fail to deliver the desired performance.

Green by Nature
Since the creation of our company in 1984, inventing products and technologies that have little or no impact on the environment and the safety of the workplace has been part of our priorities. Our inorganic polymers and composite matrices do not use organic solvents and do not emit fumes. They are easy to store and discard, and safer to handle than most matrix systems for high-temperature composites. Because we care, all of our products are environmentally friendly since the beginning.”

Source: Pyromeral Systems

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In this paper, two types of sustainable cementitious composites, geopolymer and magnesium phosphate cement, are introduced. The geopolymer is a type of amorphous alumino-silicate products and magnesium cement is MgO based cementitious material. Geopolymer can be synthesized by polycondensation reaction of geopolymeric precursor, and alkali polysilicates. The MgO cement can be obtained by properly mixing MgO particles, fly ash, and phosphate. Comparing to portland cement, geopolymers and magnesium phosphate cement are energy efficient and environment friendly. Thus they are sustainable cementitious materials. In the paper, the recent developments of these two materials at HKUST are presented. The investigation shows that these two materials have superior properties to the portland cement such as high early strength, excellent volume stability, better durability, good fire resistance, and easy manufacture process.

Source: Geoswan.com

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Geopolymers are fire-resistant, blast-resistant and acid-resistant, and could become the building and construction industry’s materials of the future. Geopolymers are a new group of building materials that has the potential to transform the building products industry.

CSIRO is working with industry partners on developing world-leading applications of this technology that could soon see products on the market.

What are geopolymers? Geopolymers are ceramic-like, inorganic polymers (that is, based on silica not carbon) that are produced at low temperatures.

They are:
Geopolymer technology is just beginning to capture the imagination of the building industry.
– fire-resistant
– blast-resistant
– acid-resistant

Their properties include being:
– adhesive
– castable
– extrudable
– sprayable
– strong

Read more at CSIRO

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Chemically bonded phosphate ceramics/cements (Ceramicrete for Mg-phosphate compositions) are room temperature-setting inorganic materials with high strength, low porosity, and good durability. These characteristics are similar to alumino-silicate geopolymers. Studying their structure, this author speculated in the annual meeting of the American Ceramic Society in 2004 that they may be considered as a class of geopolymers. Subsequently, Joseph Davidovits in his book on Geopolymers (2008) proposed chemistry and structure of phosphate and phospho-silicate geopolymers based on compositions developed in Argonne. His analysis gives key understanding of the amorphous phase found in these materials that is responsible for their high strength and dense structure. We propose here that the micro structure of phospho-silicate geoplymers consists of a network of crystalline phosphate minerals connected by phospho-silicate geopolymeric amorphous materials. Evidence is provided with X-ray diffraction studies, micro structural studies and strength properties on the presence of amorphous binding phase. We present evidence of such phosphate geopolymers from archeology on the passivation layer on a wrought iron Delhi iron pillar, which has shown no sign of corrosion despite its antiquity of 1600 years. We also propose for further research that because of more than normal abundance of phosphates in Nile delta, possibly phospho-silicates might have played a minor binding role in the blocks used in the Egyptian pyramids.

Source: EonCoat.com

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Current Research and Technology Development Projects

– Use of geopolymer cement as a high performance sewer pipeline coating.
– Development of a polymer-geopolymer composite with high cross-bending strength and high durability.
– Evaluation of a geopolymer grout using fly ash activated with a sodium hydroxide solution.
– Correlation between chemical composition of fly ash stockpiles and their suitability for geopolymer related construction products.
Evaluation of a geopolymer grout using fly ash activated with a sodium hydroxide solution.

High performance geopolymer materials have been evaluated numerous times displaying outstanding results in physical and chemical properties, overcoming Portland cement-based binders’ performance. However, Geopolymer binders can be used in a wide range of applications, and be focused in other characteristics such as flowability and setting time but always trying to find the best balance between all properties. The present paper will study and evaluate geopolymer properties such as flowability, setting time and compressive strength and their interaction with following factors: age, water/binder ratio, cement content, curing temperature, sodium hydroxide concentration and sand content. Compressive strength values up to 7000 psi with good flowability and setting times from 1 to 8 hours were obtained; very interesting tendencies in the responses when varying the factors were also noticed.

Source: Louisiana Tech University

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“Geopolymer materials represent an innovative technology that is generating considerable interest in the construction industry, particularly in light of the ongoing emphasis on sustainability. In contrast to portland cement, most geopolymer systems rely on minimally processed natural materials or industrial byproducts to provide the binding agents. Since portland cement is responsible for upward of 85 percent of the energy and 90 percent of the carbon dioxide attributed to a typical ready-mixed concrete (Marceau et al. 2007), the potential energy and carbon dioxide savings through the use of geopolymers can be considerable. Consequently, there is growing interest in geopolymer applications in transportation infrastructure.

Although geopolymer technology is considered new, the technology has ancient roots and has been postulated as the building material used in the construction of the pyramids at Giza as well as in other ancient construction (Davidovits 1984; Barsoum and Ganguly 2006; Davidovits 2008). Moreover, alkali-activated slag cement is a type of geopolymer that has been in use since the mid-20th century.”

Read the complete article here: Concrete Pavement Technology Program

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Survival shelter built with concrete pipe

Survival shelter built with concrete pipe

Here’s an innovative way to use concrete pipe to build survival shelters. The designer calls it a “21st Century Bag End by Storm Williams.” Maybe someday geopolymer pipe will be widely available.

“I have always been interested in bio-friendly housing, specifically designs that approach zero-environmental impact. After seeing The Fellowship of the Ring, you have probably fantasized about living in a Hobbit Hole and lazing about in the shade. I know I have. That is when I started expressing my inner architect and wondering of easy, bio-friendly ways to build a Hobbit Hole. This is what I have come up with.”

Source: Storm Bear World

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