When concrete is to be laid under water is to used?
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When concrete is to be laid under water is to used?
quick setting cement
17. When concrete is to be laid under water ___________ is to used. Explanation: When concrete is to be laid under water, quick setting cement is to used.
Is an effective method of placing concrete under water?
Underwater concreting using tremie method is convenient for pouring large amount of high flowable concrete. Tremie pipe, which upper end connected to a hopper and lower end continuously submerged in fresh concrete, is used to place concrete at the exact location from a hopper at the surface.
When concrete is to be laid under water then which is required along with tremie pipe?
The pipe should be long enough that it reaches to the bed of water keeping its one end above the water level. The tremie is then fitted with a hopper at the upper end for pouring concrete inside the pipe. The lower end of the tremie pipe must be closed with a check valve before inserting it into the water.
Which cement is suitable for marine works?
Expansive cement: This cement expands after setting, and hence used for repair work, grouting, etc….Important Points.
| Type of Cement | Where to Use |
|---|---|
| Portland Pozzolana Cement | Marine and Hydraulic constructions, Mass concrete structures. |
Will a bag of quikrete set up underwater?
All hydraulic cements cure underwater, including Quikrete. Modern cement binders allow builders to pour concrete underwater and leave it to cure. As a result, pouring concrete underwater around a post is simple.
What is the most important thing to do before pouring in the concrete?
Make sure you have the right materials and equipment. The necessary concrete materials need to be on-hand, inspected, and approved before pouring. This includes water, cement, aggregates, and additives. It’s a great idea to call your concrete supplier the day before a pour is scheduled to begin.
Which cement is used for undersea construction?
Under water concrete contains three ingredients: sand or gravel, water, and cement to hold it all together. The type of cement used for most construction, including underwater construction, is Portland cement. Made from heated clay and lime, Portland cement is the secret to concrete’s ability to set underwater.
What reduces the requirement of water of concrete?
Water reducers, retarders, and superplasticizers are admixtures for concrete, which are added in order to reduce the water content in a mixture or to slow the setting rate of the concrete while retaining the flowing properties of a concrete mixture.
What is the concrete which has no coarse aggregate?
No fines concrete is a lightweight concrete i.e. density is about 25 to 30\% less than the normal concrete due to no fine aggregates, thus self-weight of structure is less. It has better thermal insulating characteristic than normal concrete and thus it is useful for construction of external wall.