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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 ...
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 ...
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.
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).
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.
Cecil Lindo was born in 1870, in Falmouth, Jamaica, to Frederick Lindo and Grace Morales, the sixth of ten children.. He migrated to Costa Rica from Jamaica at age 18. His older brothers, Howard, Abraham and Robert had arrived in 1885 to work for Minor Cooper Keith, who was building a railroad from Limon to San Jose. [2]
The first 2 paragraph are sufficiently flawed, imho, as to need a complete rewrite. Currently they are:"The benefits of pozzolan use in cement and concrete are threefold. First is the economic gain obtained by replacing a substantial part of the Portland cement by cheaper, pollution free, natural pozzolans or industrial by-products.