A good question.

I normally recommend saw dust or say rice husk as natural light weight aggregate. It will give better results.

Environmental engineering point of view, you should use artificial light weight aggregate. Fly ash should be used as India is facing problem of disposal of fly ash generated by thermal power station tremendously.

By using such sintered fly ash, concrete of density 1900kg/m3 can be obtained.

Regards

Here in Brazil we used several light materials, I carried out a study with expanded clay, which presented satisfactory results.

Thank you Paulo for your quick response. If you have any research publication you may please share with me.

A good question.

I normally recommend saw dust or say rice husk as natural light weight aggregate. It will give better results.

Environmental engineering point of view, you should use artificial light weight aggregate. Fly ash should be used as India is facing problem of disposal of fly ash generated by thermal power station tremendously.

By using such sintered fly ash, concrete of density 1900kg/m3 can be obtained.

Regards

Here's the link of the article (it's in portuguese):

http://www.allquimica.com.br/arquivos/websites/artigos/concreto_leve-mayca-recena-cremonini2009101315555.pdf

Thank you Dr K N Sheth for your satisfactory answer. Also thanks for the link provided by you.

Good question Both the answers are good. I am still following

I endorse Dr Sheth's answer

There are many types of lightweight aggregates; natural and artificial and the selection depends on their availability, cost and type of structure.

Some chemicals can be used to create voids inside the concrete mass, no fine concrete is another example of lightweight concrete, and natural lightweight aggregate like Pumice, Lica, ....etc. can be used to produce lightweight concrete.

Dr Sheth' s answer is endorsed

I am thankful to all RG members for their wonderful answers

Back in the 1960's, BRE experimented with both fly ash and lightweight expanded clay aggregate (LECA). I believe E.R.Skoyles wrote several papers on the economics of lightweight concrete which should be obtainable.

Sharing link:

https://www.google.es/url?sa=t&source=web&rct=j&url=http://www.greenhomebuilding.com/QandA/lwconcrete/applications.htm&ved=2ahUKEwjZgYShp9LZAhUMuBQKHfNyBigQFjACegQIBxAB&usg=AOvVaw3JdElxjCsU0RM4gtUEqYUE

Regards!

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.