Concrete practices: Do's and Dont's for (Batching, mixing, placing, compaction and curing)
- 1. “ULTRATECH SPARKLING STAR” CONCRETE PRACTICES: DO'S AND DON'TS (BATCHING, MIXING, PLACING, COMPACTION & CURING) GUIDED BY:- Dr. J. M. PATEL PREPARED BY:- JAY L. CHAUDHARY MANU S. MEVASHI VISHNU A. PRAJAPATI
- 2. INDEX Batching A. The Do’s of Batching of concrete B. The Don’ts of Batching Concrete Mixing A. The Do’s of Mixing Concrete B. The Don’ts of Mixing Concrete Placing A. The Do’s of Placing Concrete B. The Don’ts of Placing Concrete Compaction A. The Do’s of compaction Concrete B. The Don’ts of compaction Concrete Curing A. The Do’s of Curing Concrete B. The Don’ts of Curing Concrete
- 3. BATCHING Batching is the process of measuring and introducing into the mixer the ingredients for a batch of concrete. There are two methods of batching: (i) Volume batching (ii) Weigh batching Source :- Gharpedia.com
- 4. A. THE DO’S OF BATCHING OF CONCRETE Scale recipes up, and measure accurately. Do take safety precautions. It is desirable to deposit concrete as near as practicable to its final position. Approach to reach the placing area should be free from any traffic obstruction, ensuring concrete placement with least lag.
- 5. B. THE DON’TS OF BATCHING CONCRETE Too high temperature is a problem for large size concrete batching plant. Batch perishable ingredients such as egg whites or milk. Leave batched cocktails with citrus for longer than two days. Don’t Guesstimate amounts.
- 7. MIXING Thorough mixing of the materials is essential for the production of uniform concrete. The mixing should ensure that the mass becomes homogeneous, uniform in colour and consistency. There are two methods adopted for mixing concrete: (i) Hand mixing (ii)Machine mixing Pictures from site visit @ Gallops Food Plaza
- 8. A. THE DO’S OF MIXING CONCRETE DO gather all the materials and supplies you’ll need before starting DO know exactly how much concrete you need. DO test for “slump” before beginning your project Bobvila.com
- 9. B. THE DON’TS OF MIXING CONCRETE DON’T skip the protective eyewear, rubber gloves, long sleeves, and pants. DON’T just dump the dry concrete mix in first. DON’T leave any water puddles or dry bits in the concrete mixture dailycivil.com
- 10. PLACING OF CONCRETE The aim of good concrete placing can be stated quite simply. It is to get the concrete into position at a speed, and in a condition, that allow it to be compacted properly. Source:- P Kumar Mehta & Internet
- 11. A. THE DO’S OF PLACING CONCRETE The concrete should be placed in uniform layers, not in large heaps or sloping layers. The thickness of the layer should be compatible with the method of vibration so that entrapped air can be removed from the bottom of each layer. For deep sections, a long down pipe ensures accuracy of location of concrete and minimum segregation.
- 12. Source:- P Kumar Mehta & Internet
- 13. B. THE DON’TS OF PLACING CONCRETE Collision between concrete and formwork or reinforcement should be avoided. For deep sections, a short down pipe should not be used as it ensures less accuracy of location of concrete and minimum segregation. Do not perform concrete placing where low light is available for large deep sections
- 14. s3da-design.com
- 15. COMPACTION Consolidation or compaction is the process of molding concrete within the forms and around embedded items and reinforcing steel to eliminate pockets of empty space and entrapped air. This operation can be carried out by hand rodding and tamping. However, now it is carried out by mechanical methods such as power tampers and vibrators that make it possible to place stiff mixtures with low water-cement ratio or high content of coarse aggregate.
- 17. A. THE DO’S OF COMPACTION OF CONCRETE Use of vibrator for better settlement of concrete layers. Hand Compaction :- RODDING, RAMMING, TAMPING External Vibration This is adopted where internal vibration cant be used due to either thin sections heavy reinforcement
- 18. B. THE DON’TS OF COMPACTION OF CONCRETE The soil can become over compacted if the operator makes too many passes in one direction with the machine, and this can reduce soil density. Under compaction leads to uneven settlement of the soil, and this unevenness won’t be able to bear the weight of the structure, leading to structural issues. Don’t use a vibrator to move concrete horizontally. Don’t start a job without a spare vibrator.
- 19. CURING Concrete curing deserves special attention in the construction practice because inadequate curing frequently causes the lack of proper strength and durability. One of the most common methods for curing concrete is to hose it down frequently with water—five to 10 times per day, or as often as you can Curing methods may be divided broadly into four categories: (a) Water curing (b) Membrane curing (c ) Application of heat (D) Miscellaneous
- 20. A. THE DO’S IN CONCRETE CURING DO cover newly poured concrete. DO pond cure concrete slabs. DO make the curing process more manageable by using a curing compound. DO a slump test before placing the concrete. DO spray your newly poured concrete with water Water curing
- 21. WATER PONDING CURING Pictures from site visit @ Gallops Food Plaza
- 22. B. THE DON’TS IN CONCRETE CURING Don’t let fresh concrete get cold. Don’t paint or strengthen concrete in the first month Don’t put too much weight on new concrete too soon. DON’T skip control joints in concrete slabs. DON’T subject new concrete to excessive weight
- 23. REFERENCES dailycivil.com s3da-design.com https://www.youtube.com/watch?v=3JmzbnOXACM https://www.bobvila.com/articles/mixing-concrete/ Site visit at Gallops Food Plaza, Maliya https://civildigital.com/curing-concrete-purpose-curing-curing- methods/