pozzolaanipohjaiset

Pozzolaanipohjaiset refers to materials that utilize pozzolans as a primary component. Pozzolans are siliceous or silico-aluminous materials that, in themselves, possess little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form compounds possessing cementitious properties. This reaction is known as the pozzolanic reaction.

Common natural pozzolans include volcanic ash and pumicite. Artificial pozzolans can be manufactured from materials like fly ash, a byproduct of coal combustion, and silica fume, a byproduct of silicon metal production. When these pozzolanic materials are mixed with lime and water, they undergo a chemical process that creates a stable, durable binder.

Pozzolaanipohjaiset materials are widely used in construction, most notably as a component in concrete. Incorporating pozzolans into concrete mixes can significantly enhance its properties. These improvements include increased long-term strength, improved resistance to chemical attack (such as sulfates and chlorides), reduced permeability, and a mitigation of alkali-silica reaction (ASR). The use of pozzolans can also contribute to the sustainability of concrete by reducing the amount of Portland cement required, thereby lowering the carbon footprint associated with cement production. Applications range from general construction to specialized uses like marine structures and high-performance concrete.