The jolting table is an apparatus that consists of a rectangular table rigidly connected by two light arms to a pivot at nominally 800 mm from the centre of the table. The table has to incorporate at the centre of its lower face a projecting lug with a rounded face. Beneath the projecting lug shall be a small stop with a plane upper surface. In the rest position, the common normal through the contact point of the lug and the stop has to be vertical. When the lug rests on the stop, the upper face of the table shall be horizontal so that the level of any of four corners does not deviate from the mean level by more than 1,0 mm. The table has dimensions equal to or greater than mold baseplate, and a plane machined upper surface. Clamps shall be provided for firm attachment of the mold to the table.


In operation the table is raised by a cam and allowed to fall freely from a height of 15,0 more or less 0,3 mm before the lug strikes the stop.


The apparatus must be firmly mounted on a concrete block of mass about 600 kg, volume about 0,25 m3 and dimensions as to ensure working height suitable for the mold.

The apparatus base must be fixed to the level of concrete base by anchor bolts and a thin layer of mortar, it must be placed between apparatus base and concrete base to ensure overall and vibration free contact.

The jolting group for mortar supplied to the laboratory and it is produced by TECNOTEST, it consists of: frame into 2 parts, one fixed and one oscillating, steel with quick locking device of the mold and protective carter another. Drop height of 15 mm with a frequency of 60 drops per minute. Control equipment, with selector to 3 digits for programming cycles and automatic stop at the end of the test.

Standard: AFNOR P 15, AFNOR P 412, EN 196-1

 

 

Instrument used for two types of tests: compaction of prismatic specimens of mortar or workability of thixotropic mortars.Instrument used for two types of tests: compaction of prismatic specimens of mortar or workability of thixotropic mortars.

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