A Study on Development of High Strength Concrete (95 MPa)
The IUP Journal of Structural Engineering, Vol. X, No. 3, July 2017, pp. 7-19
Posted: 7 Aug 2018
Date Written: 2017
Nowadays, High-Strength Concrete (HSC) is widely used throughout the world, and to produce them it is necessary to reduce the water/binder ratio and increase the binder content. Superplasticizers are used in these concretes to achieve the required workability. The performance of concrete begins with an understanding of the properties of the components and the equipment used for its manufacture. In the concrete manufacturing area, two items are important: the proportioning of components and the mixing of the concrete. The drum type concrete mixer is most commonly used for producing conventional concrete. In this paper, the influence of mixing time on the fresh concrete properties of HSC was investigated. The effect of mixing period was observed to find out the effect of the parameters on the fresh concrete. HSC of 95 MPa was attained using 10% replacement of cement with micro silica. The results showed that the workability and compressive strength of the mix can be improved with an increase in the mixing time. The compressive strength of concrete is used as the most basic and important material property when reinforced concrete structures are designed. It has become a problem to use this value; however, the control specimen sizes and shapes may be different from country to country. The effect of specimen size, shape and variation of its mechanical properties with age of concrete was experimentally investigated. In addition, correlation between compressive strength with size and shape was investigated.
Keywords: Mixing time, Compressive strength, Flexural strength, Split tensile strength, Young’s modulus, Specimen size
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