CAUSES, PREVENTION AND REPAIR OF CRACKS IN IN A BUILDING

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CAUSES, PREVENTION AND REPAIR OF CRACKS IN IN A BUILDING

ABSTRACT

This work discusses causes, prevention and repair of cracks in in a building. Investigation into the causes, effects and prevention of crack in building, cracks this is a kind of defects that occur into building structure which rendered building unsightly and reduces building stabilities. Cracks may be of structural failure or non-structural problem which may act slightly, moderate or several. They are save or dangerous depending on the size and characteristics of each i.e. 0-3-1.00, 1-2, 2-5,5-15 and 15-25 (mm) respectively survey of building were made in some selected area in Ilorin west L.G.A Ilorin, were aerial photographs were taken, site investigation were made in some selected areas.

Cracks in building could be as a result of use of poor materials, inappropriate mix ratio, poor workmanship, lack of soil test, foundation settlement, poor supervision, environmental problems faulty construction, faulty design and overloading, non-structural crack are mostly due to internally induced stresses in building but may look unsightly or may create an impression of instability or faulty work in some situation due to penetration of moisture through them, non structural cracks may spoil the internal finishing which thus adding to the cost of maintenance or corrode the reinforcement thereby adversely affecting the stability of the structure in long run e.g vertical crack in a long compound wall due to shrinkage or thermal movement.

Crack may appreciably vary in width from thin hair crack barely visible to naked eye to gaping crack depending upon the crack width,a crack are classified. Research shows that some of the problem of crack in Ilorin west here are due to lack of maintenance and negligence i.e allowing vegetative growth near structures which will be treating the structure, allowing unnecessary water to lodge at the base of structure. All these problem could be control by adequate maintenance professional advise and involvement in all project, been it new construction or renovation and vegetation should be control not only for constructional problem but heath wise, security conscious and social befitting.

TABLE OF CONTENTS

Title Page

Certification

Dedication

Declaration

Acknowledgement

Abstract

Table of Contents

List of table

List of Figure

CHAPTER ONE

1.0 Introduction

1.2 Statement of the Problem

1.3 Objectives of the study

1.4 Justification

1.5 Scope of the Study

1.6 Methodology

1.7Definition of Terms and Full Meanings

CHAPTER TWO

2.1Cracks Recording and Measurement

2.2Condition for Crack in Building

2.3Causes of Cracks in Building Structure

2.4Effects of cracks on Building Structure.

2.5Remedial measure

2.6Some Literature Review Pictures

CHAPTER THREE

3.1 Introduction

3.2 Methodology of Data Collection

3.3 Data Collection In Zone A

CHAPTER FOUR

ANALYSIS AND INTERPRETATION OF DATA COLLECTED

4.1Introduction

4.2Analysis and Interpretation Of Data Collected In Zone A

CHAPTER FIVE

5.0 Conclusion

5.1 Recommendation

References

CHAPTER ONE

10 INTRODUCTION

Occurrence of various cracks patterns in the building during construction, and after completion when it is subjected to super imposed load or during the service life, is a common phenomena’s. A building component develops cracks whenever the stress in the component exceeds it’s strength. Stress in the building component could be caused by externally applied forces, such as dead, live, wind and seismic loads, foundation settlement e.t.c or it could be induced internally due to thermal movement, moisture changes elastic deformation, chemical reaction e.t.c

Cracks in building could be broadly classified into two, as structural and non-structural cracks.

Structural Cracks: These occur due to incorrect design, faulty construction or overloading and these may endanger the safety of the building eg extensive cracking of an RCC beam (rein force concrete course)

Non-Structural Cracks: These are mostly due to internally induced stresses in building but may look unsightly, or may create an impression of faulty work or may give a feeling of instability in some situation due to penetration of moisture through them, non-structural cracks may spoil the internal finishes thus adding to the cost of maintenance, or corrode the reinforcement, thereby adversely affecting the stability of the structure in long run e.g vertical crack in a long compound wall due to shrinkage or thermal movement.

Cracks may appreciably vary in width from thin hair crack barely visible to naked eye to gaping crack. Depending upon the crack width crack are classified as.

(a) Thin Crack — less than 1 mm in width

(b) Medium Crack — 1 to 2mm in width

(d) Crazing — Occurrence of closely fine cracks at the surface of a material these is called crazing.

Cracks may be of uniform width through out or may be narrow at one end gradually widening at the other end. Cracks may be straight, toothed, stepped, map pattern or random type and may be vertical, horizontal or diagonal.

Cracks may be only surface and extend to more than one layer of materials. Cracks due to different causes have varying characteristics and by the careful observations of these characteristics, one can diagnose the causes of cracking for adopting the appropriate reduced measures. Small magnitude causing tension and shear stresses can lead to cracking. Internal stress are induced in the building component on account of thermal movements, moisture change, elastic deformation, chemical reaction etc.

All these phenomenon causes dimensional changes in the building components, and whenever this movement is restraint due to interconnectivity of various member, resistance between the different layers of the components etc. stresses are induced and whenever these stresses (tensile or shear) exceed the strength of material cracks occurs.

Depending upon the cause and certain physical properties of building materials, these cracks may be wide, but further apart or may be thin but more closely space. As a general rule, thin cracks even though closely spaced and greater in number, are 1ess damaging to the structures and are not so objectionable from aesthetic to the structure and other consideration as fewer number of wider cracks.

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