ASTM C-403
For fast evaluation of the initial setting of concrete. It can be used on light weight concrete, special roof deck mixes and concrete additives. Specification:
Consists of a needle having face area 3/10 sq. cm. and graduated at a distance of 25 cm. The needles point is an integral part of barrel which houses a calibrated spring. The spring is confined in a sleeve.
The resistance offered by the concrete mortar is shown on the direct reading scale with a marker ring which holds its position when released. Scale range
is 0-50 kg/cm2 when the penetration resistance reaches a value of
35kg/cm2 the concrete is assumed initially set. Supplied complete in carrying case.
ASTM C-403
It is used for finding out the rate of hardening of mortar sieved from concrete spring and a stem graduated from 0-70 kg x 1 kg. Six interchangeable penetration needles of areas 645, 323, 65 32 and 16 mm sq. is provided . The penetration resistance is measured by the force exerted to penetrate the mortar by 25 mm and is indicated by a sliding ring on the stem, which is graduated. Needle shanks are marked at every 12.5 mm. Supplied complete in a wooden carrying case.