For states suffering from alkali-silica reactivity (ASR), a problem that occurs beneath the surface of portland cement concrete (PCC) and causes cracks, spalling and other damage in bridges and pavements, help is now on the way. A new draft guide specification titled, "Portland Cement Concrete Resistant to Excessive Expansion Caused by Alkali-Silica," has been prepared by the ASR Lead States team to assist highway agencies and contractors in protecting new PCC roads and bridges from the pervasive effects of ASR. This specification is currently undergoing review by the American Association of State Highway & Transportation Officials (AASHTO) Subcommittees on Construction and Materials.
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