Placing of Concrete |
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After moving or transferring concrete from the batching and mixing point, concrete must be placed in forms before lapse of initial setting time and subsequently compacted, finished, protected and cured.
The surface on which concrete is placed should be clean and free from water, organic materials, etc. If placed below ground level, all loose earth must be removed from the bed. Concrete should not be poured from a height of more than 1.2 m to avoid segregation. Cold joints between the successive layers should be avoided (Cold joint is created if the initial setting time of cement is on lower side). |
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Q) What is the segregation of Concrete?
A)Segregation is the separation of coarse aggregate from cement paste. It mainly occurs due to excess water in concrete and non-cohesiveness of concrete. In UltraTech Concrete, the well-designed concrete is pumped from the delivery truck to the location where it is being placed through concrete pumps with horizontal and vertical pipelines. The flexible hose pipe attached at the end of pipe line makes the pouring convenient at the point of placing, thus reducing shoveling / dragging and avoiding segregation.
In UltraTech Concrete, qualified and experienced Application Engineers are exclusively dedicated to each pumping operation who provide advise regarding placing, compacting, finishing and curing of concrete. Application engineers provide following services:
- Advice on correct alignment of shuttering and formwork before concreting operation starts
- Coordination for pumping operation and actual requirement of concrete
- Coordination with plant for requirement of number of Transit Mixers
- Checking the quality of concrete in terms of workability and feedback to plant in case of any rectification
- Advice regarding maintaining correct thickness of slab, compaction and other precautionary measures during rainy season and hot weather
- Assistance in testing of concrete by filling the concrete cubes & slump cone for measuring the slump
- Assistance in testing of concrete for various parameters
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