Concrete cube casting and Testing.
- 1. QUALITY AWARENESS TOPIC:- CASTING AND CURING CONCRETE TEST SPECIMEN( CUBE CASTING). PREPARED BY : CONSTRUCTIONQUALITYWORK.COM
- 2. MAKING AND CURING CONCRETE TEST SPECIMEN.( CUBE CASTING) • Nominal Size of aggregate not more than 38 mm. • Workability shall be checked prior concrete placing (i.e Flow/Slump Checks). • Cube mould size -150mm X150mmX150mm. • Minimum size of sampling 0.02 cum. • In assembling cube mould, Oil shall be applied.
- 3. MAKING AND CURING CONCRETE TEST SPECIMEN.( CUBE CASTING) • In no case shall the concrete to be subjected less then 35 strokes per layer for 15 cm cube. Where voids are left by the tamping rod, sides of the mould shall be tapped to close the voids. ( As per IS 516) • Procedure: • A concrete cube must be filled in 3 layers. Each Un compacted layer of concrete must be filled about 25 mm more than the 1/3rd level, since concrete will settle after compacting.
- 4. MAKING AND CURING CONCRETE TEST SPECIMEN.( CUBE CASTING) • Each layer must be compacted with the 600 mm long long rounded end of 16 mm Dia. Tamping bar, by roding 4times along each of the 4 side edge of the cube mould and 4 times from centre towards edge. This will ensure at least 32 times of minimum 35 strokes specified. • Each layer has to be compacted sufficiently to ensure that cement slurry called laitance is seen along all 4 edges of mould as well as on the top surface of the concrete. i.e. no CA particles or void must be visible.
- 5. • After top layer has been compacted the extra concrete must be compacted and level of with wooden plank. • Filled mould shall be then cleaned externally and shifted in overnight shelter storage place. • Final leveling and finishing of concrete top surface must be done with masons float. After 10 to 20 min depending on ambient temperature. MAKING AND CURING CONCRETE TEST SPECIMEN.( CUBE CASTING)
- 6. • After 1 to2 hrs. when the concrete surface has hardened sufficiently each concrete have their own identification Marking by engraving on top surface with nail. • Proper Curing and Maintenance to be done. MAKING AND CURING CONCRETE TEST SPECIMEN. ( CUBE CASTING)
- 7. • Training given to Pll staff, contractor Labour, Supervisor & engineer.( Mr. Prashant) • Give details to how tamping cube and sequence for filling of concrete in cube. • Tamping rod, Tray etc. material as mention above to be available during casting of cubes at site. MAKING AND CURING CONCRETE TEST SPECIMEN. ( CUBE CASTING)
- 8. • Shown how to sampling and fill cubes. • Maintenance & Sampling process. • Proper Identifications Markings Process. • Proper Monitoring, Curing & Periodic Testing Scheduled to be followed & Maintained at site. MAKING AND CURING CONCRETE TEST SPECIMEN. ( CUBE CASTING)
- 9. SITE CONDITIONS: • Proper Curing Tank with Water level in such a way that cubes must be properly submerged in water. • Partition to be done for particular days ( i.e. 3days, 7days, 14th days & 28days). • Curing Tank Water must be Replenished within a week and proper next week date with board to be mention near curing tank area.
- 10. THANK YOU