<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343755</termId><termName>metakaolin</termName><termType>PT</termType><termNote><![CDATA[ Refined, dehydroxylated form of the clay mineral kaolinite. Like other pozzolans, it will chemically react with calcium hydroxide at ordinary temperatures to form compounds possessing cementitious properties; and is used as a substitute for cement in some concrete mixtures. ]]></termNote><termCreatedDate>2026-03-30 20:32:42</termCreatedDate><relation><relationType>BT</relationType><termId>31319875</termId><termName>pozzolana</termName><termType>PT</termType></relation></term>  </Zthes>