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Showing posts with label Roof Cost Estimation. Show all posts
Showing posts with label Roof Cost Estimation. Show all posts

Wednesday, December 20, 2017

Various types of concrete mixers

The concrete is built up through a concrete mixer by mixing cement with aggregates like sand or gravel, and water. The concrete mixers attain the consistency of the mix as well as set the mix keeping the consistency unchanged.

The process for mixing the material of concrete may vary but it should be accomplished carefully to make sure that the consistency is maintained for allotment of materials in concrete mass. It can be evaluated with uniform color and reliability of concrete.

The machine that is employed for mixing concrete is called as the mechanical concrete mixer, or just concrete mixer.

Given below, two main types of Concrete Mixers:

01. Continuous Mixer: Continuous mixers are mostly found in large constructions like dams, bridges, etc., where large masses of concrete are utilized and the constant flow of concrete is needed.

02. Batch or Drum Mixer: Batch or Drum mixer is mostly recognized in construction sites. It contains a rotating drum with blades or baffles inside it. Under this type of mixer, all the materials of the desirable proportioned mix should be entered into the hopper of the rotating drum and then drum on being revolved at a specific speed combines the materials through a series of blades arranged inside. The produced mix is finally released from the drum and transported for use.

There are following two Types of Batch Mixers.

• Tilting Mixers: Tilting mixers contain a conical or bowl-shaped drum having vanes inside. They are suitable for mixes of low adaptability and for those comprising of large size aggregate. The mixing chamber that is called as drum, is designated for discharging.

• Non-Tilting Mixers: In non-tilting mixers, the axis of the mixer always remains in horizontal direction. The discharge is accomplished either by implanting a chute into the drum or by changing the direction of rotation of the drum to the reverse or hardly by partition of the drum.

To get more information, go through the this link Gharpedia.Com

Various types of concrete mixers


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Published By
Rajib Dey
www.constructioncost.co
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Monday, December 11, 2017

How to control or minimize segregation in concrete

Segregation in concrete refers to partition of concrete components due to inconsistency of concrete mix. The flow test can easily represent the bond of the concrete mix.

If the concrete is not integrated, the major particles of aggregate will be detached and will proceed towards the periphery. Another type of segregation occurs if concrete mix is provided on a wet surface. A cement particle generally moves from the center of the concrete mix and gives up the coarser material behind. Segregation is not calculated in qualitative terms but a knowledgeable professional can easily locate it.

A segregated concrete contains a variable strength and comparatively tends to cracking and leakages from the concrete. So, proper care should be taken to get rid of segregation in concrete to enhance the longevity of your structure.

Given below, some useful tips to avoid segregation in concrete:

01. The design of the concrete mix should be perfect with ideal quantity of water i.e. not too wet nor too dry.
02. Ensure the concrete is blended properly at the accurate speed in a transit mixture for relatively two minutes. Verify the performance of mixer on a daily basis regarding adequate equality of distribution of components in each batch.
03. Transmit the concrete mix properly. Select the perfect route through which the transportation of concrete mix can be done quickly.
04. Arrange the concrete in its final position rapidly. Never pour a concrete from greater heights.
05. Formwork should have been water resistant in order that paste should leakage from the forms. Check that formwork is not vibrated.
06. Ensure that concrete should not be streamed.
07. The vibrator should have been used properly and not to be utilized for extending a heap of concrete over a greater area.
08. Vibrate the concrete for just the exact time-not too long, not too less.
09. Employ chemical admixtures like air entraining agent in the mix. Entrained air helps in minimizing the possibility of segregation.
10. If any segregation is found in concrete, remixing should be performed to sustain it’s consistency.
How to control or minimize segregation in concrete
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Published By
Rajib Dey
www.constructioncost.co
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