Length Change Apparatus measures changes in length of cast prisms due to alkali-silica reactivity (ASR), autoclave curing and other causes not related to applied load. Methods are applicable to testing of hardened portland cement paste, mortar, concrete, or evaluation of hydraulic hydrated lime for structural purposes.
HM-254 Test Bar Holder (order separately) holds up to eight 1x1in (25x25mm) bars of 10in (254mm) gage length. Bars are held vertically above water level to expose all specimens to Autoclave steam.
Prism Molds, Gage Studs (ASTM C 490, AASHTO M 210, others): Prism Molds are corrosion- resistant steel (HM-258 is stainless) with base plate, removable partitions and end plates, designed to provide required length of 10in (254mm) between ends of gage studs cast in ends of bars. Dimensions from outside ends of studs (comparator gage contact points) are 11-5/8in (296mm); specimens are 11-1/4in (286mm) long.
Select molds for specimen cross sections of 1x1in, 2x2in, or 3x3in. Molds for 5in (127mm) gage length specimens available. Package of ten stainless steel Gage Studs HM-268 are knurled and threaded, 1/4x13/16in (6.35x20.64mm) diameter x L.
HM-270 Mortar Bar Container (ASTM C 227), is stainless steel with tight fitting cover to seal in water vapor. Vertically supports up to 36 mortar bars in container with lower end above water surface. Box is 9x11x15.5in (229x279x394mm), LxWxH.