The following 15 precautions should be taken during the preparation of good-quality concrete:
1. The cement and aggregates should be adequate in quality and it should ensure that they meet the required specifications to achieve the desired strength and durability of concrete.
2. The aggregate should be hard and durable. And, it shall be properly graded in size.
3. The cement should be of sufficient quantity and quality to produce the required strength and water-tightness.
4. The water shall be free from organic material or any deleterious minerals. The quantity of water should be such that it produces the needed consistency.
5. To make a good quality of concrete you should follow the proper water-cement ratio specified in the mix design. Avoid adding excessive water, which can weaken the concrete strength and affect its durability.
6. Mixing should be done thoroughly so as to produce homogeneity.
7. During the transportation of concrete, there should be no segregation of or separation of materials in concrete take place.
8. Concrete delivered at the point of placing should be uniform & have the proper consistency.
9. The concrete should not be thrown from a height to avoid segregation.
10. It should be deposited in an even horizontal layer of uniform thickness. Concrete should fill every part in these forms.
11. Until the concrete becomes hard, it is necessary to ensure that the temperature of the concrete is maintained above the freezing point.
12. When the placing operation is suspended for some time, groves must be made in the finished work joining of future work.
13. In easy of R.C.C slab, placing of concrete should be started from the end and done width wise.
14. The old concrete surface must be made rough, cleaned and cement grouted before placing fresh concrete over it.
15. The finished work should be cured properly for a specified time.
Conclusion: By following these precautions, you can significantly increase the chances of preparing good quality concrete. For any specific guidance, you must consult a professional engineer or local concrete expert.
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