HM-570 Acme Penetrometer and HM-571 Mortar Penetration Apparatus are used to determine setting times of concrete mixes by measuring the penetration resistance. Suitable for lab and field testing, both are also ideal for testing prepared mortars and grouts.
A mortar sample, sieved from fresh mix, is placed in a container and stored at a specified temperature. It is tested at regular intervals with standard penetration needles. Resistance is plotted to determine initial (500psi) and final (4000psi) setting times.
Both units include six standard stainless steel penetration needles with 1, 1/2, 1/4, 1/10, 1/20, 1/40 in² (645, 323, 161, 65, 32, and 16mm²) bearing areas.