The gillmore needle apparatus is used to determine the initial and final set times of Portland cement, masonry cement, hydrated lime and other certain mortars. The apparatus generally has two stainless steel needles used for penetrating the cement specimen that is being tested. This testing is done to ascertain the value of different parameters such as penetration depth, time taken to reach the requisite level of penetration etc.
The gillmore needle apparatus is widely used in the construction industry for ensuring that the mortar or cement being used for construction has the requisite strength to withstand heavy duty usage and other environmental factors. Durability is paramount in any construction because it eliminates the need for constant repair, thus saving money as well as daily troubles for people. This necessitates the usage of gillmore needle apparatus for testing the specimen of mortars to be used for construction. The apparatus is available in various standard technical specifications and can also be custom made at market leading rates.
Components of a Gillmore Needle Apparatus
Two horizontal arms
Glass base plate
Two Gillmore needles
Summary of The Test Method :
Sufficient water is added to the cement that is being tested to produce a paste of normal consistency. Then a specimen is molded from this paste and is tested to ascertain the time taken for setting by means of the gillmore initial and final needles. The initial time of the setting is the time required for the test specimen to bear the initial needle without any major indentation, while the time taken for the specimen to bear the final gillmore needle without any major indentation is the final time of setting.
Conditioning Requirements For Performing The Test Through Gillmore Needle Apparatus :
Maintain the temperature of the room, dry materials, plates between 20-26 degrees Celsius.
Make sure the temperature of the water to be mixed is between 20-25 degrees Celsius.
The relative humidity of the room where the test is to be carried out should not be less than 50 percent.