foundation system of burj al arab

Properties of Aggregates for Concrete in Severe Weathering Regions (Part-1)

Dear reader in previous post we have discussed about properties and limits of deleterious substances in aggregate for concrete construction in negligible weathering regions. Now we are discussing about aggregates that have to suffer severe weathering conditions. The location of different weathering regions are shown in the figure below:

The aggregates are designated as below:

a. 1S
b. 2S
c. 3S
d. 4S
e. 5S
Location of concrete aggregate Weathering Regions

1S class aggregates are considered to be used in following conditions

Worn out exposed architectural concrete
That is All concrete members are not exposed to weathering and floor slabs essentially interior slab having any types of covering.

2S class aggregates are considered to apply interior floors having no covering.

3S class aggregates are considered to apply in following conditions:

  • Foundation walls located above ground
  • Retaining wall
  • Abutments
  • Piers
  • Girders and beams exposed to weather

4S class aggregates are considered to apply in following conditions:
    Architectural concrete rendered as  masonry
  • Pavements
  • Bridges decks
  • Driveways
  • Curb
  • Walks
  • Patios
  • Garage floors
  • Exposed porches and floors
  • Water-front structures; any types of concrete member that are frequently subjected to wetting

5S class aggregates are considered in architectural concrete exposed to weathering.

Dear reader here we have learnt weathering regions and exposure conditions for severe weathering aggregate. In the next part we will learn about limits of different deleterious substances and corresponding physical properties.

1 comment:

  1. It's kind of crazy that so much of the country is at such a high risk. I know that I would want to do everything I could to prevent this kind of issue on my own property. I'm sure that other people feel the same way as me too. I hope that people are able to do things to get themselves the right kind of help to keep themselves in a good place.