The impact-echo technique is a nondestructive test used to detect flaws in concrete. Although deterioration can be quantified through the Q-factor, little is known about its relationship to other parameters. This research study explored possible correlations between Q-factors and other parameters including expansion change…
Contents
Chapter 1: Introduction
1.1 Problem Statement
1.2 Background
1.3 Objectives and Scope of Work
1.4 Outline of Report
Chapter 2: Literature Review
2.1 ImpactEcho Method
2.1.1 Introduction
2.1.2 Basic Principles and Equations
2.1.3 The QFactor
2.1.4 Components and Procedure of ImpactEcho Testing
2.2 Deterioration in Concrete: Delayed Ettringite Formation (DEF) and Alkali
Silica Reactivity (ASR)
2.2.1 Introduction
2.2.2 Definition and Difference
2.2.3 Heat Curing
2.2.4 Previous Research on DEFrelated Damage in Concrete
Chapter 3: Sample Preparation and Deteriorating Methods
3.1 Introduction
3.2 Specimen Preparation
3.2.1 Mix Design and Materials
3.2.2 Casting Procedure
3.2.3 Curing Method and Storage Condition
3.3 Deteriorating Methods
3.3.1 UMD Modified Duggan Heating Cycle
3.3.2 FreezingandThawing Cycles
Chapter 4: Assessment Tests and Procedures
4.1 Assessment Tests
4.1.1 Introduction
4.1.2 Number of Specimens Used
4.2 Procedures
4.2.1 Expansion Test
4.2.2 Weight Change Measurements
4.2.3 ImpactEcho Test
4.2.4 Compression Strength Test
Chapter 5: Test Results
5.1 Introduction
5.2 Expansion Test Results
5.2.1 Duggan Cycle Batch I and Batch II
5.2.2 Environmental Chamber FreezeThaw Batch I and Batch II
5.2.3 Cabinet Apparatus FreezeThaw Batch I and Batch II
5.3 Weight Change Measurement Results
5.3.1 Duggan Cycle Batch I and Batch II
5.3.2 Environmental Chamber FreezeThaw Batch I and Batch II
5.3.3 Cabinet Apparatus FreezeThaw Batch I and Batch II
5.4 QFactor from ImpactEcho Results
5.4.1 Duggan Cycle Batch I and Batch II
5.4.2 Environmental Chamber FreezeThaw Batch I and Batch II
5.4.3 Cabinet Apparatus FreezeThaw Batch I and Batch II
5.5 Compression Strength Test Results
5.5.1 Duggan Cycle Batch I and Batch II
5.6 Correlation with Qfactors from ImpactEcho Results
5.6.1 Duggan Cycle Batch I and Batch II
5.6.1.1 Expansion Correlation
5.6.1.2 Weight Change Correlation
5.6.1.3 Compression Strength Correlation
5.6.2 Environmental Chamber FreezeThaw Batch I and Batch II
5.6.2.1 Expansion Correlation
5.6.2.2 Weight Change Correlation
5.6.3 Cabinet Apparatus FreezeThaw Batch I and Batch II
5.6.3.1 Expansion Correlation
5.6.3.2 Weight Change Correlation
5.7 Discussion of Results
Chapter 6: Summary and Conclusions
6.1 Summary
6.2 Conclusions
Appendix
Bibliography
Author: Lijeron, Cintia M
Source: University of Maryland
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