What is alkali-activated binders?
Alkali-activated binders or geopolymer binders are hardened Page 2 compounds which acquire their strength and other properties by chemical reaction between an alkaline soluble source and aluminate-rich raw materials.
What are alkali-activated cements?
Alkali-activated cements gain their strength, and other properties, via chemical reaction between a source of alkali (soluble base activator) and aluminate-rich materials. Geopolymeric cements are particular examples of ´alkali-activated pozzolanic cements´ or ´alkali-activated latent hydraulic cements´.
What is alkali activation technology?
Alkali-activation is a globally growing technology that involves the chemical reaction between a solid aluminosilicate precursor and an alkaline activator, at room temperatures, giving a hardened product (Shi et al. 2006).
What is the difference between geopolymer concrete and alkali activated concrete?
Generally in the literature, the ligands with precursors based on alumina and silica are treated as geopolymers, while alkali activated cement are based on precursors rich in calcium.
What is alkali activated materials?
Alkali activated materials (AAMs) are binders, sometimes named geopolymers, that are produced through the reaction of an alkali source and aluminosilicates. The most commonly used alkali sources are sodium or potassium hydroxides and/or silicates, while aluminosilicates may include suitable raw materials and wastes.
Is cement an alkali?
The alkali content refers to the content of Na2O and K2O in cement. The condition for concrete to conduct the alkali-aggregate reaction is that the cement must contain alkali.
What is activated slag?
Abstract: Alkali-activated slag (AAS) is a promising alternative to ordinary Portland cement (OPC) as sole binder for reinforced concrete structures. OPC is reportedly responsible for over 5% of the global CO2 emission. In addition, slag is an industrial by-product that must be land-filled if not re-used.
What is meant by geopolymer?
Geopolymers are inorganic, typically ceramic, alumino-silicate forming long-range, covalently bonded, non-crystalline (amorphous) networks. Raw materials used in the synthesis of silicon-based polymers are mainly rock-forming minerals of geological origin, hence the name: geopolymer.