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Lightweight Concrete Roofing

Thu Oct 18, 2012Total posts : 1
Ted Junior
Ted Junior
Join date: Oct 2012
Topic: Lightweight Concrete Roofing

I am planning on building my 1200 sq ft double story  house. 4 inch thick Walls are gona be, poured in  1400kg/m3 density LWC, reinforced with polypropylene fibre and welded wire mesh supported with 3/4" MS rebar at four ft spacing. I want to reduce dead load of 1st floor and top roof concrete slabs by the use of fibre/MS reinforced LWC. If someone has done it before I will appreciate for a piece of advice on specs and procedure.    

Fri Oct 19, 2012Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

Dear Ted Junior

I have not done in field personally, but some datta about light weight concrete is as 

 Lightweight concretes can either be lightweight aggregate concrete, foamed concrete or autoclaved aerated concrete (AAC). Such lightweight concrete blocks are often used in house construction.

Lightweight aggregate concrete can be produced using a variety of lightweight aggregates. Lightweight aggregates originate from either:

  • Natural materials, like volcanic pumice.
  • The thermal treatment of natural raw materials like clay, slate or shale i.e. Leca.
  • Manufacture from industrial by-products such as fly ash, i.e. Lytag.
  • Processing of industrial by-products like FBA or slag.
     

The required properties of the lightweight concrete will have a bearing on the best type of lightweight aggregate to use. If little structural requirement, but high thermal insulation properties, are needed then a light, weak aggregate can be used. This will result in relatively low strength concrete.
 
Lightweight aggregate concretes can, however, be used for structural applications, with strengths equivalent to normal weight concrete.
 
The benefits of using lightweight aggregate concrete include:
 

  • Reduction in dead loads making savings in foundations and reinforcement.
  • Improved thermal properties.
  • Improved fire resistance.
  • Savings in transporting and handling precast units on site.
 

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