The objective of this study was to determine if the growth of delayed ettringite formation (DEF) in existing concrete can be reduced or even prevented with commercial products. Additionally, the objectives were to determine if externally treating concrete specimens….
Contents
Chapter 1: Introduction
1.1 Statement of Problem
1.2 Background
1.3 Objective and Scope of Work
1.4 Outline of Report
Chapter 2: Literature Review
2.1 Delayed Ettringite Formation (DEF)
2.2 Mechanism of Delayed Ettringite Formation
2.3 Damage Due to Delayed Ettringite Formation
2.4 DEF and Alkali Silica Reaction (ASR)
2.5 Mitigating Delayed Ettringite Formation
2.6 Mitigating Alkali Silica Reaction
Chapter 3: Experimental Approach
Chapter 4: Mitigation Products
4.1 Introduction
4.2 Water Repellents
4.2.1 ChimneySaver
4.2.2 Radcon Formula #7
4.3 Crystal Growth Inhibitor
4.3.1 Dequest 2060S
4.3.2 Good-Rite K-752
4.4 Mitigation Product Application Procedure
4.4.1 Water Repellent Application Procedure
4.4.2 Crystal Inhibitor Application Procedure
4.4.3 Cross Combination Application Procedure
Chapter 5: Concrete Sample Preparation and Test Methods
5.1 Introduction
5.1.1 Research Laboratories
5.2 Concrete Mix Design
5.3 Materials
5.3.1 Fine Aggregate
5.3.2 Coarse Aggregate
5.3.3 Type III Cement
5.3.4 Potassium Carbonate
5.3.5 Molds
5.4 Casting
5.5 Curing
5.6 Storage Conditions
5.7 UMD/FHWA Modified Duggan Cycle
5.7.1 Duggan Cycle Sample Preparation
5.7.2 UMD/FHWA Modified Duggan Cycle
5.8 Tests and Test Frequency
5.8.1 Expansion Test
5.8.2 Weight Change Measurements
5.8.3 Compression Test
5.8.4 Scanning Electron Microscope (SEM) Spectrometry
Chapter 6: Test Data Presentation
6.1 Expansion Results
6.1.1 Control & Water Repellents (Set Nos. 1 – 3)
6.1.2 Dequest 2060S (Set Nos. 4 – 6)
6.1.3 Good-Rite K-752 (Set Nos. 7 – 9)
6.1.4 Summary of Expansion Results
6.2 Weight Change Results
6.2.1 Control & Water Repellents (Set Nos. 1 – 3)
6.2.2 Dequest 2060S (Set Nos. 4 – 6)
6.2.3 Good-Rite K-752 (Set Nos. 7 – 9)
6.2.4 Summary of Weight Change Results
6.3 Compression Test Results
6.3.1 Control & Water Repellents (Set Nos. 1 – 3)
6.3.2 Dequest2060S (Set Nos. 4 – 6)
6.3.3 Good-Rite K-752 (Set Nos. 7 – 9)
6.4 SEM and EDAX Analysis Results………….
Source: University of Maryland
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