04-11-2016, 12:12 PM
“ASSESSING SUITABILITY OF ALKALI ACTIVATED GEOPOLYMER FOR PFB (Prefabricated Blocks) FOR LOW COST RESIDENTIAL CONSTRUCTION”
1464522795-8FINALREPORT.docx (Size: 98.21 KB / Downloads: 8)
ABSTRACT
Geopolymers are a class of inorganic polymer formed by the reaction between a highly alkaline solutions incorporated with aluminosilicate source. Waste materials such as flyash produced from power generation, and slag such as ground granulated blast furnace slags, bauxite processing residues, metakaoline, etc. can be used as aluminosilicate sources.
Flyash in general has become an environmental hazard requiring utmost importance to be given to its reuse, since disposal is not an economically viable solution any longer. The present work envisages formulating a concrete mix which can be used to create ecofriendly building blocks for low cost construction wherein waste materials can be used effectively with value addition to the society.
We are going to identify and use fine waste as an alternative to sand, formulate an optimal percentage for replacement of sand also put together a mix to reduce the use of cement and/or lime with articulating the value for optimal curing time.
In this semester we have studied various available literatures on geopolymer concrete and identified fine waste sand as an alternative to river sand. Also, we have collected the criteria for PFB’s used in low cost construction. The study of properties of various flyash and alkali materials to be used in the project is done.
Economic Benefits
Fly ash-based geopolymer concrete offers several economic benefits over Portland cement concreteThe cost of one ton of fly ash is only a small fraction, if not free in some parts of the world, of the cost of one ton of Portland cement. Therefore, after allowing for the cost of activator liquids needed to the make the geopolymer concrete, we have estimated that the cost of fly ash-based geopolymer concrete may be about 10 to 30 percent cheaper than that of Portland cement concretez
In addition, we have learnt that the appropriate usage of one ton of fly ash earns one carbon-credit that has a redemption value of about 10 to 20 Euros. Based on the data given in this paper, one ton low-calcium fly ash can be utilised to manufacture approximately 2.5 cubic metres of fly ash-based geopolymer concrete, and hence earn monetary benefits through carbon-credit trad
.
Furthermore, the very little drying shrinkage, the low creep, and the excellent resistance to sulfate attack offered by the fly ash-based geopolymer concrete may yield additional economic benefits when it is utilised in infrastructure applications.