Heat, humidity cause chemical reaction that weakens bridges

08/27/2009 | Houston Chronicle (tiered subscription model)

A chemical reaction in the concrete materials used to build bridges has weakened four spans in Harris County, Texas. The alkali-silica reaction, or ASR, can turn the inside of bridges and other structures into gel, which causes cracks in the structure. The excessive heat and humidity in the Houston area leads to a higher incidence of ASR than in other regions of the country.

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