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Pozzolans are a broad class of siliceous and aluminous materials which, in themselves, possess little or no cementitious value but which will, in finely divided form and in the presence of water, react chemically with calcium hydroxide (Ca(OH) 2) at ordinary temperature to form compounds possessing cementitious properties. [1]
The pozzolanic reaction is the chemical reaction that occurs in portland cement upon the addition of pozzolans. It is the main reaction involved in the Roman concrete invented in Ancient Rome and used to build, for example, the Pantheon. The pozzolanic reaction converts a silica-rich precursor with no cementing properties, to a calcium silicate ...
J. Wray and Nephew Ltd. Consumer goods Distillers & vintners Kingston: 1825 Distiller P A Jamaica Air Shuttle: Consumer services Airlines Kingston: 2009 Airline, defunct 2013 P D Jamaica Observer: Consumer services Publishing Kingston: 1993 Newspaper P A Jamaica Pegasus Hotel: Consumer services Hotels Kingston: 1973 Hotel P A Jamaica Stock ...
Pozzolana from Mount Vesuvius volcano, Italy. Pozzolana or pozzuolana (/ ˌ p ɒ t s (w) ə ˈ l ɑː n ə / POT-s(w)ə-LAH-nə, Italian: [potts(w)oˈlaːna]), also known as pozzolanic ash (Latin: pulvis puteolanus), is a natural siliceous or siliceous-aluminous material which reacts with calcium hydroxide in the presence of water at room temperature (cf. pozzolanic reaction).
Compared to using Portland cement, the resulting concrete-mix using EMC does not require a higher "total cementitious content" to meet strength-development requirements. In testing by BASF, the 28-day strength-development for 55% replacement of Portland cement by a natural pozzolanic EMC was 14,000 psi / 96.5 MPa (i.e. > C95). This comprised a ...
Portmore (Jamaican Creole: Puotmuor) is a large urban settlement located along the southeastern coast of Jamaica in Saint Catherine, and a dormitory community for Kingston and Spanish Town, which neighbour it. On Febraury 11, 2025 the Jamaican House of Representatives voted that Portmore be designated the 15th parish in Jamaica.
Located 22 miles (35 km) west of Kingston, [6] Port Esquivel is primarily an alumina-handling facility but is also the only port on Jamaica's south coast capable of accommodating large ships. [7] Its 645 feet (197 m) pier is made of concrete and steel and some 35,000 tonnes (34,000 long tons; 39,000 short tons) of goods can be loaded and ...
This is a list of plantations and pens in Jamaica by county and parish including historic parishes that have since been merged with modern ones. Plantations produced crops, such as sugar cane and coffee, while livestock pens produced animals for labour on plantations and for consumption.