<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31304799</termId><termName>alkali-silica reaction</termName><termType>PT</termType><termNote><![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. ]]></termNote><termCreatedDate>2026-03-30 20:21:59</termCreatedDate><relation><relationType>UF</relationType><termId>31304800</termId><termName>ASR</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31304801</termId><termName>reaction, alkali-silica</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31298688</termId><termName>physicochemical processes</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31374696</termId><termName>portland cement</termName><termType>PT</termType></relation></term>  </Zthes>