Abstract: Concrete pavement has long been considered an environmentally and economically sustainable pavement choice for its longevity. This hallmark of concrete pavements ensures that the desirable performance characteristic of the pavement remains essentially intact for several decades. Concrete pavement mixtures incorporate industrial byproducts i.e., (fly ash and silica fumes) which lower the disposal needs, reduces the demand on virgin materials, and conserves natural resources. The design and properties of this type of concrete, which could be applied by using conventional equipment, are presented in this project. The technical characteristics of the concrete which includes local Fly Ash and Silica Fumes are well described including durability performance observation. The usage of these industrial by products to replace the cement is because the production of cement emits carbon dioxide gas in to atmosphere by increasing the effect of global warming.
To enhance the strength properties of the ordinary Portland cement (OPC), industrial by products such as Fly Ash and Silica Fumes can be utilized. The effect of Silica Fumes and Fly Ash as a partial replacement of Ordinary Portland Cement on compressive strength, split tensile strength and stress strain behavior of concrete has been studied. To study these properties of concrete, it was categorized in to two groups with two water cement ratios of 0.3 and 0.35. Five types of mix proportions were used to cast the test specimens for both groups. The replacement levels of OPC by silica fumes were 0%, 10%, 20%, 25%, and 30% where replacement levels by Fly Ash were 0%, 10%, 20%, 25% and 30%. All these specimens are tested for 28 days strength. 20% of silica fumes and 20% of fly ash where found to be optimum for maximum compressive strength, maximum split tensile strength at low cost than that of conventional concrete which reduces the consumption rate of cement by 173 kg per cubic meter. Hence by reducing usage of amount of cement the cost of construction can be decreased which leads to low cost concrete pavements with high efficiency.
Keywords: Fly Ash and Silica Fumes, Ordinary Portland cement (Opc).
Title: Effect of Fly Ash and Silica Fumes on Strength, Stress Strain Behaviour of M25 Concrete Mix
Author: Dr. T SURESH BABU, J PAVITRA
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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