: a cement (see cemententry 1 sense 1b) that sets under water and that is made by finely pulverizing the clinker produced by heating a mixture of clay and limestone or similar materials to a high temperature just short of fusing
Drexel engineers have found a way to improve upon ordinary Portland cement …, the glue that's bonded much of the world's construction since the late 1800s.—Swiss National Science Foundation
Once the joints are open, refill them with a dry mix of stone dust and portland cement, mixed at a ratio of 1 part cement to 6 parts dust.—This Old House
Examples of Portland cement in a Sentence
Recent Examples on the WebConcrete resurfacers are basically Portland cement, sand and polymers.—Jeanne Huber, Washington Post, 3 Nov. 2023 Most modern concrete starts with Portland cement, a powder made by heating limestone and clay to super-high temperatures and grinding them up.—Maddie Burakoff, Fortune, 3 Oct. 2023 Concrete is basically a mixture of sand, gravel and Portland cement, plus water to make the mixture fluid enough to form and to trigger the chemical reaction that hardens the cement.—Jeanne Huber, Washington Post, 22 Sep. 2023 This biochar, created from two different temperatures, was then incorporated in various percentages into Portland cement as a replacement for fine aggregate (in this case natural sand).—Darren Orf, Popular Mechanics, 24 Aug. 2023 Instead the mixes consist of just gravel and glue, either Portland cement or asphalt.—Jeanne Huber, Washington Post, 7 July 2023 This tool makes short work of punching a reliable hole in concrete, mortar, brick, Portland cement plaster (stucco), and even many types of stone.—Roy Berendsohn, Popular Mechanics, 26 May 2023 First cotton, then fresh oakum, is neatly threaded into the narrow plank seams, and covered with Portland cement.—Amy Davis, Baltimore Sun, 20 Dec. 2022 The heavy plaster, mixed with Portland cement, more than three inches thick and applied to a lath of chicken wire, required an ax to break through.—Thomas Curwenstaff Writer, Los Angeles Times, 5 Mar. 2023 See More
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'Portland cement.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Isle of Portland, England; from its resemblance to a limestone found there