<?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">alkali-silica reaction</topic></authority><related type="other"><topic>portland cement</topic></related><related type="broader"><topic>physicochemical processes</topic></related><variant type="other"><topic>ASR</topic></variant><variant type="other"><topic>reaction, alkali-silica</topic></variant> <note xml:lang="en"><![CDATA[ Materials-related distress arising from a simple acid-base reaction between alkali hydroxyl ions in portland cement and siliceous minerals. Found in many aggregates, it results in premature deterioration of concrete structures including bridges, dams, and pavements. ]]></note></mads>