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Showing posts with label Concrete Bricks. Show all posts
Showing posts with label Concrete Bricks. Show all posts

Monday, November 12, 2018

Benefits of post-tensioning concrete slabs in building

Post-tensioned concrete slabs in buildings provide various benefits over reinforced concrete slabs & other structural systems toward both single and multi-level structures. Described below, some of the advantages of the slabs :-

Longer Spans: Longer spans are utilized to lessen the number of columns. It leads to bigger, column free floor areas which significantly enhance the adaptability of application for the structure as well as leads to greater rental returns.

Entire structural cost: The complete cost of materials, labor and formwork which are essential to build up a floor is decreased for spans higher than 7 meters and consequently leads to huge cost savings.

Minimized floor to floor height: Thinner slabs are utilized for the similar imposed loads. The decreased section depths facilitate least building height together with consequent savings in facade costs. As a substitute, toward bigger buildings, it facilitates more floors to be developed inside the original building envelope.

Deflection Free Slabs: Unwanted deflections under service loads are virtually removed.

Water-resistant slabs: Post-tensioned slabs are designed to remain free from cracks and as a result water-resistant slabs should be formed with proper design, detailing and construction. The selection of concrete mix and curing method together with standard workmanship are also very important.

Early formwork stripping: The earlier stripping of formwork and curtailed backpropping requirements facilitate rapid construction cycles as well as fast reprocessing of formwork.

Materials Handling: The decreased material quantities in concrete and reinforcement significantly offer benefit to on-site carnage requirements. The stability of post-tensioning strand is roughly 4 times that of traditional reinforcement. So, the whole weight of reinforcing material is considerably minimized.

Column and footing design: The decreased floor dead loads are applied to create cost-effective design of the reinforcement concrete columns and footings. In multi-storied buildings, decreased column sizes may raise the floor net rentable area.

Benefits of post-tensioning concrete slabs in building

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Published By
Rajib Dey
www.constructioncost.co
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Wednesday, December 13, 2017

Comparison between OPC and PPC (fly ash based cement)

OPC 53 Grade Cement:OPC (Ordinary Portland Cement) belongs to the basic form of cement and it is formed with 95% cement clinkers and 5% gypsum.

Gypsum stands for an additive and it’s objective is to enhance the setting time of the cement to a executable 30 minutes or more.

OPC Cement provides high compressive strength at initial phases and at 28 days. A 53 Grade cement provides equal to 70 MPa strength across a minimum 53 MPa stated by BIS. Therefore, fly ash can also be blended (minimum 20% by weight of cement) in concrete as part replacement of cement at jobsite.

Due to this the material cost of concrete is saved significantly as well as durable properties can be maintained because of pore refinement (Less porous concrete).

If the concrete is formed in this way, the adaptability of concrete is enhanced greatly and it leads to higher strength in due course.

Recommended use for OPC 53 Grade Cement:
OPC 53 Grade cement is normally mostly suitable for Structural Concrete or Reinforced Concrete Works (like Columns, Beams, Slab etc.,).
PPC (Fly Ash Based) Cement: Alternatively, PPC (Portland Pozzolana Cement) is formed with 75 – 77% cement clinker, 20% flyash and 3-5% gypsum.
Recommended use for PPC: Flyash based cement (PPC) will be effective for brick masonry, plastering, tiling and waterproofing works. In these works, strength is not a vital factor. PPC is more beneficial as compared to OPC because PPC contains slower rate of heat of hydration.
Thus PPC is likely to less cracks & shrinkage), superior workability and finishing (because fly ash based cement are circular in shape and thinner in size).
Comparison between OPC and PPC (fly ash based cement)
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Published By
Rajib Dey
www.constructioncost.co
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