MIDAR is a revolutionary sustainable geopolymer technology that can be used for numerous applications, from encapsulating waste (including nuclear) to acting as an alternative production method for construction products and ceramics.
What is MIDAR?
MIDAR is a technology platform that uses a low temperature chemical reaction to consolidate aluminosilicate materials and form a robust solid inorganic material with high strength and chemical stability. The resulting material can be used as an encapsulation and immobilization agent by incorporating a solid or liquid waste stream into the inorganic solid matrix that is formed during the reaction. The MIDAR geopolymerization process can be varied to accommodate different methods of forming: extrusion, moulding and casting.
The dominant raw materials are aluminosilicate materials. Examples include:
- Coal fly ash
- Blast furnace slags
- Waste glass
- Construction waste, e.g. bricks and concrete
- Mine tailings
- Amorphous clays, e.g. meta-kaolin
- Volcanic ash.
The technology can also be used to make solid or aerated building products.
Why use MIDAR?
- Potential to utilise waste raw materials to form a high strength, solid matrix similar to ceramics
- As the technology is based on a chemical reaction, no firing is required - this reduces energy usage and carbon emissions
- The resulting material is fire, frost, chemical, shock, water and heat resistant
- It has a low level of leachability of encapsulated materials (e.g. radioactive substances)
- Curing time can be altered to suit system needs
- The resulting solid has negligible shrinkage (near net shape)
- It is a technology that has been honed by an experienced team of scientists and engineers whose aim is to produce materials technologies that address your technical challenges and commercial needs.
MIDAR Compared to Cement and Organic Polymers in an Encapsulation / Immobilization Application:
|Attribute||Cement||Organic or Silicone Polymer||MIDAR|
|Solids loading||Low||Low||High (up to 50%)|
|Resistance to fire and frost||Low||None/ Limited||Good|
|Shrinkage on curing||Low||Low to high (polymer dependent)||Negligible|
|Application method||Pumped (high viscosity)||Pumped (high viscosity)||Poured or pumped|
New BSI Standard for Alkali-activated Cementitious Material
In March 2016, a new BSI standard (PAS 8820) was published to define raw material and product performance specifications to give manufacturers of construction materials the opportunity to develop products based on alkali activated cement technologies, safe in the knowledge that they comply with a European standard of approval. The standard refers to, and benchmarks against, a number of well used cement standards, ensuring consumer confidence in the new technology.
Prior to the publication of the standard, planning a route to the European market for alkali based cementitious construction products proved difficult; though technically proven to meet the requirements for many applications, there was a lack of acceptance by building standards.
Interested in exploring the suitability of applying MIDAR technology to your products, challenges and manufacturing processes? Contact our Raleigh, NC, USA office on 919-504-4900 or our Stoke-on-Trent, UK office on +44 (0)1782 764326.