Split Tensile Strength Test Of Concrete
The concrete is weak in tension and can’t withstand strong tension force. The cracks occur in concrete due to tensile forces. Therefore, tensile strength of concrete becomes important to ascertain the load at which the concrete cracks. The tensile strength of concrete plays an important role in combined-stress design. The tensile strength value of concrete is calculated with fundamentally various tests like flexure, direct tension and splitting. Among them, splitting tensile strength test is a very useful method.
In splitting tension test, a concrete cylinder, similar to the type utilized in compression tests, is arranged with its horizontal axis among the platens of a testing machine. The load is raised before failure occurs with indirect tension as a consequence of splitting along the vertical axis happens.
EQPT/ MATERIAL: Cylinder molds, cone mixer, concrete making materials, vibrating table, bearing strips, compression testing machine, weighing machine, trays.
1. Produce 5 specimens of the standard concrete cylinder having 6″ dia and 12″ length.
2. Cast the cylinder with organized mixed in three layers by making use of vibrating table.
3. De-mold the specimens next 24 – hrs and retain them in curing tank for curing.
4. Once 28 days curing is completed, remove all the specimens from the tank.
5. Arrange concrete cylinders among two plywood bearing strip of 1/8″ width and 13″ length on the plate of machine along generetrix.
6. Employ the load devoid of shock at an unfluctuating rate and with the range of 11300 to 22600 lbs per minute unless failure of specimen occurs.
7. Note the load at failure.
PARTICULARS OF READINGS AND RECORDABLE OBSERVATION/DATA - Following readings are noted throughout experiment and specified table should be filled:
1. Specimen identification number =
2. Dimension of specimen=
3. Date of casting =
4. Area of cylinder=
5. Age of testing=
. If the load acts on along the generatrix, then an element on vertical diameter of the
cylinder is liable to vertical compressive stress of 2P/LD * D2 /r (D-r)-l. and the horizontal tensile stress of 2P/nLD where P denotes Compressive load, L = Length of cylinder, D= Diameter of cylinder
INTERPRETATION/COLLECTION OF READINGS, GRAPH ETC LENDING TO THE RESULTS - The standard specification of ASTM C 496-96 is applied to perform it.
1. All molds should be oiled before filling,
2. All are casted in three proper layers and vibrated.
3. Bearing strips should not be reprocessed.
4. Load should be employed bit by bit, devoid of shock at an indicated rate.