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| Concrete Cracks |
Here are some methods to protect your concrete in hot weather :
1. Schedule a pre-placement meeting to discuss the general concrete placement checklist and the current plan for concrete placement in hot weather.
2. Place the concrete early in the morning, in the daytime, or late afternoon when the ambient temperature is low.
3. Keep the concrete plant, mixers, and vibrators in a good operating condition, because intermediate stoppage of concrete due to the breakdown of the equipment can be much more serious under hot weather conditions than in moderate weather.
4. Keep the stocks of fine and coarse aggregate as cool as possible by making shades on the stocks or sprinkling water on the stocks.
5. Painting of mixers white.
6. Cooling of mixers by sprinkling of water discharging of concrete from plants to mixers.
7. Cement hydration, temperature rise, slump loss, aggregate grinding and gain of air content all occur with the passage of time while the concrete is in the mixer, so the time elapsed between the start of mixing and start of placement should be minimised.
8. To minimise the time, good communication between the job site and plant should be established d dispatching of the mixers and rate of concrete placement should be well coordinated.
If the mixers are needed to deliver the concert through a route with a Major volume of traffic, the placement should be scheduled during a period of lower traffic load.
9. Paint the water tanks with white colour.
10. Replace some percentage of the mixing water with ice.
11. Use the high slump 170+/- 40 mm or flow mixes.
12. Use the fresh concrete temperature below 32°C
13. Usage of admixtures: Retarding admixtures meeting ASTM C 494, Type D requirements have both water-reducing and set retarding properties and are used widely under hot weather conditions. They can be included in concrete in varying proportions and in combination with SP/PC admixtures so that, as temperature increases, higher dosages of the admixture may be used to obtain a uniform time of setting.
14. Use pozzolanic materials like FA and GGBS as a replacement for cement for low heat of hydration and Concrete temperature controls.
15. As per the project specification, proper curing must be implemented on time to avoid cracks.
POST CREDIT: INTERNET/ BOOKS
IMAGE CREDIT: INTERNET
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