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FIELD TESTS ON CEMENT AND SAND

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Construction materials testing is process which helps engineers, contractors and owners to list out problems and deficiencies in materials before actual construction. Field testing help to find out whether the materials are suitable for construction or not by just simple visual and easy practical tests.


Field Tests on different materials: 



CEMENT: Field tests conducted on Cement to check its feasibility for construction are 


Colour: Cement should be GREY with light green shade colour. Colour should be uniform throughout.


Lumps: Lumps are the formation of small hard balls of cements due to absorption of air. Cement should be free from lumps for construction purpose.


Temperature Test: If hand is poured inside the bag full of Cement it should feel Cold inside.


Smoothness Test: If some of the Cement in taken in hands and rubbed between the fingers it should feel smooth. If it feels hard or rough then it is indication of poor grinding and adulteration with sand.


Sunk Test: If small amount of Cement is thrown in water then it should FLOAT for some time before sinking down. If Cement directly sink down on coming in contact with water then it is suitable for construction.


SAND: Field tests conducted on sand are


Silt Content Tests: Take small amount of sand and put water in it shake well and allow to settle for some time. After settling there will be formation of clay layer that means there is presence of silt. Max permissible limit of silt content is 8%.


Grading Test: Sand should be uniformly graded. Means every particle should have approximately the same size.


Shape: Shape of sand must be as angular as possible so as to achieve greater strength. Should avoid round surface.


Bulking of Sand Test: Dry sand have a same volume but when it comes in contact with moisture it can gain the vol ume. So good sand Bulking should be as minimum as possible.


Civil Engineering

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