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HM-256 1x1x10in (25x25x254mm) Single Prism Mold forms Portland cement paste, mortar or concrete samples for length change testing. It is for use with a Length Comparator in measuring length change in cast prisms due to alkali-silica reactivity (ASR) and other adverse causes.
The mold is constructed of corrosion-resistant steel, and comes with a base plate, removable partitions and end plates to provide required length of 10in (254mm) between ends of HM-268 Gage Studs cast in ends of bars. Dimensions from outside end of gage studs are 11.25in (286mm) with specimen cross sections of 1x1in (25x25mm).
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