Pozzolana
Videos
Pozzolana or pozzuolana, also known as pozzolanic ash, is a natural siliceous or siliceous-aluminous material that reacts with calcium hydroxide in the presence of water at room temperature. In this r
Pozzolana from Mount Vesuvius volcano, Italy
Cement
Videos
A cement is a binder used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel together. Ceme
Pozzolana
…temperature (cf. pozzolanic reaction). In this reaction insoluble calcium silicate hydrate and calcium aluminate hydrate compounds are formed possessing cementitious properties. The designation pozzolana is derived from one of the primary deposits of volcanic ash used by the Romans in Italy, at Pozzuoli. The modern…
Cement powder being poured from a bag, ready to be mixed with aggregates and water.
Clinker nodules produced by sintering at 1450 °C
Calcium oxide obtained by thermal decomposition of calcium carbonate at high temperature (above 825 °C).
William Aspdin is considered the inventor of "modern" Portland cement.