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===Construction=== Cherts can cause several problems when used as concrete aggregates. Deeply weathered chert develops surface pop-outs when used in concrete that undergoes freezing and thawing because of the high porosity of weathered chert. The other concern is that certain cherts undergo an alkali-silica reaction with high-alkali cements. This reaction leads to cracking and expansion of concrete and ultimately to failure of the material.<ref>Terry R. West. "Geology Applied to Engineering," Waveland Press, 1995 {{ISBN|1577666550}}</ref>
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