Quality Control Of Concrete Cubes Test

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ACKNOWLEDGEMENT

I would take this opportunity to thank my dissertation tutor, family and friends for their support and guidance, without which this research would not have been possible.

ABSTRACT

In this study, some mechanical properties of high strength concrete under the effect of fire flame exposure are presented. The concrete specimens were subjected to fire flame temperatures ranging from (20-850 °C) at different ages of 30, 60 and 90 days. Three temperature levels of 400°C, 600°C and 850°C were chosen of exposure duration of 2.0 hours. After burning, the concrete specimens were quenched in a water tank to provide the maximum shock due to sudden cooling. The test results showed that the density, compressive strength, tensile and flexural strength decreases when the fire flame temperatures were increased. Mathematical models were proposed to predict the compressive strength, splitting tensile strength and flexural strength of concrete after exposure to fire flame. These models made by statistical program called (DATA FIT 9.0.59, 2009).

Table of Content

ACKNOWLEDGEMENTII

ABSTRACTIII

CHAPTER 1: INTRODUCTION1

Objective8

Scope8

CHAPTER 2: LITERATURE REVIEW10

Fire Effect on The Mechanical Properties of Concrete10

CHAPTER 3: EXPERIMENTAL WORK14

Material and Mixture properties14

Concrete Mixing and Casting16

Burning and Cooling16

CHAPTER 4: RESULTS AND DISCUSSION18

The Density18

Effect of Temperature on Compressive Strength20

Effect of Temperature on Tensile and Flexural Strengths23

Effect of Exposure Fire Flame on The Colour of Concrete27

Models for Prediction of Mechanical properties of Concrete After Exposure to Fire Flame27

CHAPTER 6: CONCLUSION35

REFERENCES37

CHAPTER 1: INTRODUCTION

Concrete is the most widely used construction material in the world. It is used in many different structures such as dam, pavement, building frame or bridge. Also, it is the most widely used material in the world, far exceeding other materials. Its worldwide production exceeds that of steel by a factor of 10 in tonnage and by more than a factor of 30 in volume. The present consumption of concrete is over 10 billion tons a year, that is, each person on earth consumes more than 1.7 ton of concrete per year. It is more than 10 times of the consumption by weight of steel. Concrete is neither as strong nor as tough as steel.

In the structural design of buildings, in addition to the normal gravity and lateral loads, it is in many cases necessary to design the structure to safely resist exposure to fire. However it is usually necessary to guard against structural collapse for a given period of time Shetty ( 1988). Several investigations have shown that the deterioration in the compressive strength of concrete under high temperature exposure. There are indeed rare researches about temperature gradient and exposure time of the concrete indirect contact with the fire flames. In this study there is an attempt to investigate the effect of temperature gradient and exposure of high strength concrete to fire flames on compressive strength, tensile strength and flexural strength of high strength concrete (Abrams, 1971).

Concrete, the oldest and the most widely used construction material in the construction of civil engineering structures, is a composite material that consists of essentially cements, aggregate and water. Besides, chemical admixtures are essential when special ...