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Portland cement, the basic ingredient of concrete, is a closely controlled chemical combination of calcium, silicon, aluminum, iron and small amounts of other ingredients to which gypsum is added in the final grinding process to regulate the setting time of the concrete.
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www.cement.org/basics/howmade.asp
www.cement.org/basics/howmade.asp
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Brief and Straightforward Guide: What is Portland Cement? ... Today, the core ingredients for Portland cement include cement clinker with a small amount of calcium sulfate. Other random ingredients are sometimes introduced as well.
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www.wisegeek.com/what-is-portland-cement.htm
www.wisegeek.com/what-is-portland-cement.htm
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Portland Cement (ASTM Types) ... Modified Portland Cement (Expansive Cement) ... Type Blended Ingredients...
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www.fhwa.dot.gov/infrastructure/materialsgrp/cement.htm...
www.fhwa.dot.gov/infrastructure/materialsgrp/cement.html
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Wc = mass of cement; Wp = mass of pozzolan; Wi = mass of ice; Ww = mass of mixing water; Wcam = mass of free and absorbed moisture in coarse aggregate; Wfam = mass of free and absorbed moisture in fine aggregate ... ; Figure 12. Equation. Temperature of fresh concrete from ingredients.
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www.fhwa.dot.gov/pavement/pccp/pubs/02099/chapt3.cfm
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Cement - Wikipedia, the free encyclopedia
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In the most general sense of the word, a cement is a binder, a substance which sets and hardens independently, and can bind other materials together. The word "cement" traces to the Romans, who used...
en.wikipedia.org/wiki/Cement
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Concrete - Wikipedia, the free encyclopedia
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Concrete is a construction material composed of cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such...
en.wikipedia.org/wiki/Concrete
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When deficiencies in these ingredients are encountered in the rock normally used in cement production, additional silica and alumina are added. Since sand is a good source of silica, alumina, and iron oxides, it is often used in the production of Portland cement.
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www.foundryrecycling.org/TechnicalApplications/Manufact...
www.foundryrecycling.org/TechnicalApplications/ManufacturedProducts/PortlandCement/tabid/173/Default.aspx
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Although there are other cements for special purposes, this module will focus solely on portland cement and its properties. The production of portland cement begins with the quarrying of limestone, CaCO3. ... Concrete has many properties that make it a popular construction material. The correct proportion of ingredients,
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matse1.mse.uiuc.edu/concrete/prin.html
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New and improved fungicidal grout compositions are disclosed having a Portland cement base with a halogenated aromatic dinitrile added as an active fungicidal ingredient. The dinitrile is first wet blended with an inert solid fungicidal carrier and a surfactant, then dried and finely divided into a powder.
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www.patentgenius.com/patent/4556426.html
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