Compressive Strength and Split Tensile Styrength of Geopolymer Mortar with Binary and Quinary Blends
Abstract
Today, the world is on the verge of witnessing a sustained growth in infrastructure build up. The demand in the construction industry has increased the necessity of high strength concrete. In all construction work, concrete plays a vital part and it increases the total cost of the project. There is also concern on the production and usage of concrete due to its impact on environment. Concrete can be generally be produced of locally available constituents, However, environmental concerns, stemming from the high energy expenses and CO2 emission associated with cement manufacture have brought about pressures to reduce cement consumption through the use of supplementary materials. It reduces the cost, makes concrete more durable and it is eco-friendly. As part of the research efforts to develop cement less alkali-activated mortar using fly ash and other supplementary materials as a binder.
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Introduction
The use of alkali materials and aluminosilicates to form a cement is broadly referred to as 'Geopolymer' technology, coined by French researcher Davidovits, but is also known as alkali-activated cement and inorganic polymer concrete in various parts of the world. Geopolymer technology provides comparable performance to traditional cementitious binders, but with the added advantage of significantly reduced Greenhouse emissions, increased fire and chemical resistance and waste utilization. The use of Geopolymer in modern industrial applications is a recent development, becoming increasingly popular due to its intrinsic environmental and technical benefits.
Conclusion
The comprehensive experimental test results and analysis of various geopolymer mixtures in this study can be summarized below:
The addition of alkali activator (NaOH and Na2Sio3) was not effective in the initiation of geopolymerisation reaction at ordinary room temperature and showed a marked improved setting when cured in hot air oven at 100oC.
In this investigation geopolymer mortar with constant alkaline liquid to binder ratio of 0.35 was used and flyash: sand ratio as 1:1. The molar concentration of NaOH is 8M. Ratio of NaOH: Na2SiO3 is taken as 2.5. It can be summarized from the compressive strength results that among the binary blends, the maximum addition of metakaolin up to 15% and Nano Silica upto 10% had shown consistent increase in the compressive strength.
Compressive Strength decreased (5.89MPa) while adding binary Blends containing Volcanic ash and Zeolite alone. But while adding Quinary components compressive strength increased upto 19.78MPa.
Fly ash is actually a solid waste. So, it is priceless. If it can be used for any purpose then it will be good for both environment and economy. Hence it is a safe and environmentally consistent method of disposal.
Uses of these materials in concrete can save the metal industry disposal costs and produce a ‘greener’ concrete for construction. An innovative supplementary Construction Material is formed through this study.
It is found to be finally concluded that replacement level should be varied, to gain higher strength at early stages instead of using various synthesized process.