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Their reliability has by now earned them acceptance in various standard codes such as ASTM International.
Some automated slump meters, such as the one by Verifi also can add water to the concrete mix in the delivery truck while in transit.
Each time, each layer is tamped 25 times with a 2 ft (600 mm)-long bullet-nosed metal rod measuring At the end of the fourth stage, the concrete is struck off flush with the top of the mould.
The mould is carefully lifted vertically upwards, so as not to disturb the concrete cone. The slump of the concrete is measured by measuring the distance from the top of the slumped concrete to the level of the top of the slump cone.
The masonry industry has established guidelines for masonry grout, which allows contractors to produce quality materials and deliver them efficiently to where they are needed on the jobsite.
The “Standard Specification for Grout for Masonry” (ASTM C476) is the prevailing specification in the masonry industry.
The slump test is referred to in several testing and building codes, with minor differences in the details of performing the test.
It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows.
Very dry mixes having slump 0 – 25 mm are typically used in road making, low workability mixes having slump 10 – 40 mm are typically used for foundations with light reinforcement, medium workability mixes with slump 50 – 90 mm, are typically used for normal reinforced concrete placed with vibration, high workability concrete with slump The slump test is suitable for slumps of medium to low workability, slump in the range of 5 – 260 mm, the test fails to determine the difference in workability in stiff mixes which have zero slump, or for wet mixes that give a collapse slump.