Tremie concrete refers to placement by gravity feed from a hopper through a vertical pipe extending for above the surface to the underwater floor. As concrete flows from the bottom of the pipe, more is added to the hopper so that the tremie pipe is continuously charged with fresh mix.

What is tremie method of concreting?

A tremie is used to pour concrete underwater in a way that avoids washout of cement from the mix due to turbulent water contact with the concrete while it is flowing. ... Builders use tremie methods for materials other than concrete, and for industries other than construction.

What is tremie concrete enumerate the steps involved in tremie concreting?

Tremie Method of Underwater Concreting

The concrete is moved to the hopper by either pumping, belt conveyer or skips. 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.

What is the purpose of a tremie?

A tremie is a pipe that can be used for pouring concrete below ground level, often underwater. Common applications include piling works, basements, diaphragm walls, caissons, underwater foundations, and so on.

Will cement dry underwater?

Portland cement is a hydraulic cement that sets and hardens in the presence of water. Concrete made with Portland cement will harden even if it is completely under water.

What is tremie concreting? Part 02

17 related questions found

Can you pour concrete into water?

The good news is that you can pour the concrete in water. ... The biggest issue with pouring concrete under water is movement. If the water is moving, it can wash away the cement paste that's holding the sand and gravel together. But if the water is calm, then it's not a problem at all.

Where is concrete vacuum used?

The main application of vacuum concrete is hydropower plants. Vacuum concrete application is a cooling tower. The another application of vacuum concrete is on the industrial floor, cold storages, etc. Vacuum concrete is widely used in bridges of ports and harbours.

Is tremie a code for concrete?

4.3. 4 1,n case of tremie concreting for piles of smaller diameter and depth of up to 10 m, the minimum cement content should be 350 kg/m* of concrete. For piles of large diameter and/or deeper piles, the minimum cement content should be 400 kg/ m* of concrete.

What is a tremie slab?

A tremie seal is a non-reinforced concrete slab anchored by piles against buoyancy and installed underwater by divers within sheet piling or slurry walls to control water intrusion. Typically, the perimeter sheet piling is installed, followed by anchored production piles.

What is the principle of mix proportioning?

Concrete mix proportioning or Mix Design is a process that consists of two interrelated steps: (1) selection of the suitable ingredients and (2) determination of their relative quantities to produce, as economically as possible, concrete of the appropriate workability, strength and durability.

What is grouting in concrete?

Cement Grouting is the injection under pressure of cement or grout to fill voids or fractures in the soil, rock unit or concrete structure. Cement Grouting is a process by which cement is injected under pressure to fill fractures and voids in concrete structures.

What is Bucket placing method?

Bucket Placing Method: In this method the concrete is deposited under water by a bottom opening bucket. The buckets usually are fitted with bottom roller or drop bottom gates as shown in Fig. 18.13. The gate opens freely outward when tripped.

What is pumpable concrete?

Pumpable concrete is the concrete which can easily pass through a pipeline without causing segregation and bleeding is called pumped concrete. They are mostly used in concrete pumps for high rise building. ... The pump should be made in such a way that the friction at the inner wall should less.

What is shotcrete used for?

In this context, these terms are not interchangeable. Shotcrete is placed and compacted/consolidated at the same time, due to the force with which it is ejected from the nozzle. It can be sprayed onto any type or shape of surface, including vertical or overhead areas.

How do you stop concrete from bleeding?

There are four primary ways to reduce the possible occurrence of concrete bleed:

1. Maintain a strict water to cement ratio.
2. Add sand.
3. Add Supplementary Cementous Materials (SCM's) into your mix.
4. Add air entrainment to the mix.

What is the minimum depth of pile foundation?

Depth of deep foundation depend on applied load on structure If the load on foundation is 500KN, minimum depth is 3.5m to 4.5m, If the load on foundation is in the range of 2000KN to 3000KN, minimum depth for pile foundation is 6.0m to 20.0m with pile caps.

What are the equipment used in vacuum concrete?

Mainly, four components are required in vacuum dewatering of concrete, which are given below: Vacuum pump. Water separator. Filtering pad.

How do you make concrete without fines?

Mix aggregate with cement in a six to one ratio. Once the cement is thoroughly mixed with the aggregate, add water in the volume indicated to the right, do not over water the mix. Rocks should appear thoroughly coated but not runny.

What is the vacuum concrete?

: concrete that has had a vacuum applied through special mats, pads, or forms shortly after placement for the purpose of removing a portion of the mixing water not needed for the hydration of the cement.

Is it OK if it rains after pouring concrete?

If the rain occurs when the concrete is fresh (about 2-4 hours after mixing), the surface should be protected from the rain. ... If the concrete has stiffened to the point where it is ready for grooving and grinding (typically 4-8 hours after mixing), damage due to rain is usually no longer a concern.

Is it OK to pour concrete in the rain?

Pouring concrete in the rain can compromise its strength, increasing the tendency for dusting and scaling to develop. Once the damage is done, it can be hard to rectify and will often ruin the appearance of the finished surface. Don't let it rain on your parade.

Can I pour concrete over 2 days?

If you expect to pour concrete and use it in a couple days, you can't. ... Protect new concrete from the cold for the first two to three days—up to a week, if it's very cold—after which it should be strong enough to handle it without risk of damage.