<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">portland cement</topic></authority><related type="narrower"><topic>high-early-strength cement</topic></related><related type="narrower"><topic>masonry cement</topic></related><related type="narrower"><topic>modified portland cement</topic></related><related type="narrower"><topic>portland slag cement</topic></related><related type="narrower"><topic>portland-pozzolan cement</topic></related><related type="narrower"><topic>ordinary portland cement</topic></related><related type="narrower"><topic>sulfate-resistant cement</topic></related><related type="narrower"><topic>low-heat cement</topic></related><related type="other"><topic>alkali-silica reaction</topic></related><related type="broader"><topic>cement by composition or origin</topic></related><variant type="other"><topic>cement, portland</topic></variant> <note xml:lang="en"><![CDATA[ binding material in the form of a finely ground powder, usually gray, that is manufactured by burning and grinding a mixture of limestone and clay or limestone and shale. The cementitious binder for most structural concrete; obtained by pulverizing clinker consisting essentially of hydraulic calcium silicates; contains calcium sulfate as an interground addition. When mixed with water, the anhydrous calcium silicates and other constituents in the portland cement react chemically with the water, combining with it (hydration) and decomposing in it (hydrolysis) and hardening and developing strength. Joseph Aspdin, of England, patented the basic process in 1824, naming it for the resemblance of the cement when set to portland stone, a limestone from the Isle of Portland.  ]]></note></mads>