International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue VIII, August 2018 | ISSN 2321–2705

Design and Development of M150 Grade Concrete

 A. Sreenivasulu

 Associate Professor, Department of Civil Engineering, PVP Siddhartha Institute of Technology, Vijayawada, Andhra Pradesh, India

Abstract:-Concrete is easy to work with, versatile, durable, and economical. By taking a few basic precautions, it is also one of the safest building materials known. The use of high strength concrete results in many advantages such as reduction in beam and column sizes and increase in the building height with many stories. High strength concrete is usually considered to be a concrete with 28 days compressive strength of at least 40 MPa. But in recent years, it is defined as the concrete having a minimum 28 days compressive strength of 60 MPa. In many developed countries, the concrete producers arbitrarily having 28 days compressive strength of above 45 MPa when normal weight of aggregate is used. High strength concrete has been widely used in Civil Engineering in recent years. High strength is made possible by reducing porosity, non homogeneity and micro cracks in concrete and the transition zone. It can be achieved by using super plasticizers and supplementary cementing materials such as silica fume, granulated blast furnace slag and natural pozzolana. High strength concrete has a high modulus of elasticity. High performance concrete with a very low permeability ensures long life of structure exposed to such conditions. The durability is not a problem under extreme conditions of exposure. Preliminary experiments have been done on Cement, Fine aggregate and Coarse aggregate. In the present investigation, Silica fume is used as mineral admixture and 920SH is used as chemical admixture. The w/c ratio for M150 concrete is considered as 0.25. By following the design procedure given by ACI Method, the mix Proportion for M150 grade concrete is derived as 1 : 0.454 : 1.527. The compressive and split tensile strengths are identified for the concrete after exposed to elevated temperature ranging from 50 to 250oC with the exposure duration of 1 to 4 hours.

Keywords: High strength concrete, Silica fume, Pozzolana, Mineral admixture, Chemical admixture

I. INTRODUCTION

Concrete is a product obtained by hardening of the mixture of cement, sand, gravel and water in predetermined operations. Concrete is one of the most widely used construction materials throughout the world. Many desirable properties such as high compressive strength, excellent durability and fire resistance contributed toward its wide range of applicability. The most advantageous and unique feature of concrete is that it can be produced using locally available ingredients as aggregates.