Meaning of pozzolan | Babel Free

Definitions

Any material which, when combined with calcium hydroxide, exhibits cementitious properties; often used as an extender with Portland cements.

Examples

“Both are what are called pozzolans, reactive materials that help⟳ make⟳ the concrete stronger.”

“The U.S. Bureau of Reclamation (Gilliland & Moran 1949; Moran & Gilliand 1950) developed a mortar bar expansion test⟳ using Pyrex glass as a “standard reactive aggregate” to evaluate⟳ the efficacy of pozzolans for controlling ASR. For example, in the specification for the Davis Dam in Arizona the requirement for the pozzolan, among other properties, was to affect⟳ a reduction of at least 75% in the 14-day expansion of mortar bars produced with high-alkali cement plus 20% pozzolan plus Pyrex glass when stored over water at 100°F (38ºC).”

CEFR level