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HM-256 Single Prism Mold, 1x1x10in (25x25x254mm) forms 10in effective gauge length prism test bars. Testing applications include potential alkali reactivity, expansion, and volume, length, and linear change. It is also used with a Length Comparator to measure Portland cement paste, mortar, and concrete prism samples.
The mold has a base plate, removable partitions and end plates constructed of corrosion-resistant steel 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 11.625in (296mm) with specimen cross sections of 1x1in (25x25mm).
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