Alkali-activated materials (AAM)
Alkali-activated materials (AAM) or more specifically Alkali-activated cementitious materials (AACM) might also be referred to as geopolymers, they can be created from a range of different materials, most usually from industrial by-products and are termed precursors. These are added to an alkaline medium or activator to produce a cementitious material that can be used instead of Portland cement in the making of concrete.
It was in 1957, when a scientist from Kyiv, Ukraine (which was then part of USSR), Victor Glukhovsky, put forward a working hypothesis in which he established that there was close relationship between alkalis and cementitious materials. He investigated the production of binders by using low basic or free calcium alumino-silicate source (clay) with alkaline activators, the new binder was referred to as soil–cements or soil silicate concretes. It was his assumptions and investigations that formed the foundation on which new types of cementitious materials could be developed, which were then called alkaline cements and sometime later AACMs.
It was around the 1970's that AAMs were first industrially produced for use as cementitious materials, they had a lower carbon footprint, because the reaction could happen at room temperature and could also contribute to the early ideas around the circular economy because it was possible to use industrial by-products as the raw materials. The term and concept of geopolymer was developed more specifically by Joseph Davidovits, later in 1991, and with ongoing developement in the field, definitions of what a geopolymer is have become gradually more diverse and at times somewhat conflicting.
Alkali-activation is the chemical reaction between a solid aluminosilicate precursor and an alkaline source or activator, importantly it can occur at room temperature to produce a hardened product. The most commonly used alkali sources are sodium or potassium hydroxides and/or silicates, while aluminosilicates may include suitable raw materials and waste products.
The Concrete Society describe alkali activated cements (including geopolymer cements) as:
"The aluminate-containing material - the pozzolan/latent hydraulic binder component of the cement - can be coal fly ash, municipal solid waste incinerator ash (MSWIA), metakaolin, blastfurnace slag, steel slag or other slags, or other alumina-rich materials. The alkali used as the activator tends to be an alkali silicate solution such as sodium silicate (waterglass) but can also be sodium hydroxide solution, or a combination of the two, or other source of alkali (such as lime). Geopolymeric cements are particular examples of ´alkali-activated pozzolanic cements´ or ´alkali-activated latent hydraulic cements´. All alkali-activated cements tend to have lower embodied energy/carbon footprints than Portland cements (up to 80-90% but this is pozzolan dependent). Manufacture on a commercial basis is underway in the UK, Australia, USA and possibly, China. Covered by PAS 8820:2016 Construction materials. Alkali activated cementitious material and concrete. Specification"
[edit] Related articles on Designing Buildings
Featured articles and news
Government consultations for the summer of 2025
A year of Labour, past and present consultations on the environment, the built environment, training and tax.
CMA competitiveness probe of major housing developers
100 million affordable housing contributions committed with further consultation published.
Homes England supports Greencore Homes
42 new build affordable sustainable homes in Oxfordshire.
Zero carbon social housing: unlocking brownfield potential
Seven ZEDpod strategies for brownfield housing success.
CIOB report; a blueprint for SDGs and the built environment
Pairing the Sustainable Development Goals with projects.
Types, tests, standards and fires relating to external cladding
Brief descriptions with an extensive list of fires for review.
Latest Build UK Building Safety Regime explainer published
Key elements in one short, now updated document.
UKGBC launch the UK Climate Resilience Roadmap
First guidance of its kind on direct climate impacts for the built environment and how it can adapt.
CLC Health, Safety and Wellbeing Strategy 2025
Launched by the Minister for Industry to look at fatalities on site, improving mental health and other issues.
One of the most impressive Victorian architects. Book review.
Common Assessment Standard now with building safety
New CAS update now includes mandatory building safety questions.
RTPI leader to become new CIOB Chief Executive Officer
Dr Victoria Hills MRTPI, FICE to take over after Caroline Gumble’s departure.
Social and affordable housing, a long term plan for delivery
The “Delivering a Decade of Renewal for Social and Affordable Housing” strategy sets out future path.
A change to adoptive architecture
Effects of global weather warming on architectural detailing, material choice and human interaction.
The proposed publicly owned and backed subsidiary of Homes England, to facilitate new homes.
How big is the problem and what can we do to mitigate the effects?
Overheating guidance and tools for building designers
A number of cool guides to help with the heat.
The UK's Modern Industrial Strategy: A 10 year plan
Previous consultation criticism, current key elements and general support with some persisting reservations.
Building Safety Regulator reforms
New roles, new staff and a new fast track service pave the way for a single construction regulator.