Table of Contents
- 1 What makes a concrete mix pumpable?
- 2 How do you make concrete pumpable?
- 3 What is concrete Pumpability?
- 4 Can you pump permeable concrete?
- 5 What does pumpable mean?
- 6 What should be the properties of pumpable concrete?
- 7 How is Permeable concrete installed?
- 8 What is the meaning of the term ‘pumpable concrete’?
- 9 What are the admixtures for pumpable concrete?
- 10 How does concrete move through a pump line?
What makes a concrete mix pumpable?
WHAT MAKES CONCRETE PUMPABLE? When concrete is pumped, free water in the mix transmits the pump pressure to the concrete slug. But if the spaces or voids between the aggre- gates are not filled with mortar, or the mortar is too thin and runny, the pump pressure can cause segregation forcing the water through the mix.
How do you make concrete pumpable?
To indirectly improve the pumpability of high-strength concrete, Bui recommends using a medium-range water-reducing admixture and/or a superplasticizer (HRWR), which increase workability and reduce the water-cementitious materials ratio.
What is the slump of pumpable concrete?
The workability of pumped concrete, in general, has an average slump of between 50 mm and 100 mm. A concrete of less than 50 mm slump is impractical for pumping, and slump above 125 mm should be avoided.
What is concrete Pumpability?
CONCRETE PUMPING In general, concrete pumpability is defined as the capacity of a concrete under pressure to be mobilized while maintaining its initial properties (Gray (1), Beaupré, (2)).
Can you pump permeable concrete?
The pour. Like traditional concrete, there are many different methods and equipment for pouring pervious concrete. However, since pervious concrete is a low-slump mixture, it cannot be pumped into place like traditional concrete.
How much do concrete pumps charge?
Concrete pumps are rented by the hour. Generally speaking, hourly rates will range somewhere between $150 and $200. Prices will vary based on region and the amount of competition in the area.
What does pumpable mean?
Definition of pumpable : capable of being pumped a heavy but still pumpable mud fluid— F. J. Williams.
What should be the properties of pumpable concrete?
The pumpable concrete should have: (a) It should have minimum fine particles smaller than 0.25 mm in size (cement + fine aggregate), approximately 400 kg/m3 of concrete for the max size of 32 mm of coarse aggregate.
What is FM value?
The Fineness Modulus (FM) is an empirical figure obtained by adding the total percentage of the sample of an aggregate retained on each of a specified series of sieves, and dividing the sum by 100. In general, however, a smaller value indicates a finer aggregate.
How is Permeable concrete installed?
However, since pervious concrete is a low-slump mixture, it cannot be pumped into place like traditional concrete. The most common methods of placement are directly from a ready-mixed truck, with a concrete buggy or by conveyor.
What is the meaning of the term ‘pumpable concrete’?
Pumpable concrete is not a special concrete, but an ordinary concrete which can be pushed through a pipe line is called a pumpable concrete. This concrete should be proportioned in such a way that its friction on the inner walls of the pipe line does not increase to such a limit to prevent its movement at the pressure applied by the pump.
What makes a concrete pump pump?
“The two main ingredients that make concrete pump are water and cement,” Brown says, and while admixtures can increase pumpability, that will only happen if the supplier doesn’t take out too much water and cement. “If you replace too much of that water and cement with a chemical, it may give the same slump, but it takes out pumpability.
What are the admixtures for pumpable concrete?
Admixtures: 1. Mid range water reducer 2. Mid range water reducer 3. High range water reducer and retarder 1. 2. 3. 4. 5. 6. W/C ratio within its range. be used for W/C ratio of 0.46-0.50. ratios 0.44 – 0.46 must be avoided. grade with nominal cement content. popularization of pumping of concrete. mix design method of pumpable concrete.
How does concrete move through a pump line?
In a pump line, concrete moves in the form of a cylinder or slug separated from the pump line wall by a lubricating layer of water, cement, and fine sand. To keep moving through the line, the mix must be dense, cohesive, and have sufficient mortar.