Hydration and autogenous shrinkage of sodium silicate based alkali activated slag
- Issued Date
- 2018
- Abstract
- 이 연구는 실험적 및 이론적 접근에 의해 알칼리 활성화 슬래그의 수화 반응 및 자체 수축 특성을 연구하는 것을 목적으로한다. 다양한 농도의 분말형 규산 나트륨 알칼리성 활성제가 사용되었다. 수화도 및 반응 정도의 측정을 위해 다양한 실험 기술을 적용하였으며 수집 된 결과를 토대로 각 방법의 장단점을 평가했다. 수화 반응 모델링은 몰 밸런스 또는 화학량론적 계산 및 열역학적 깁스 (Gibbs) 자유 에너지 최소화 (GEMS) 프로그램에 기초하여 수행되었다. 실험적 반응 결과로 모델링을 조정함으로써 습-온-화학 (Hygro-thermo-chemical) 방정식을 사용하여 반응 동역학 모델링을 위한 매개 변수를 결정했습니다. 마지막으로 모세관으로부터 발생하는 알칼리 활성 슬래그의 선형 자기수축 현상을 기존의 크리프 모델을 변형한 모델을 이용해 해석하였으며 이 모델을 이용해 각 물리량의 기여도를 평가 하였다. 모델링 및 실험의 결과 수축에 대한 기여는 모세관 인장력 보다 크리프가 약 2-3배 더 높은 것을 확인 하였다.|This research is aimed to study the hydration reaction and autogenous shrinkage properties of alkali-activated slag by experimental and theoretical approach. The powdered type sodium silicate was used as an activator with various concentration. For the measurement of degree of hydration and reaction, different experimental techniques were implemented and based on the collected results, the pros and cons of each method were evaluated. The hydration reactions modeling was also carried out based on a molar balance method and thermodynamics modeling (GEMS program). By coordinating the modeling with the experimental reactivity result, some parameters were determined for the modeling of reaction kinetics. From the result Hygro-thermo-chemical equation provides a better simulation results. In the last part of the study, the one-dimensional autogenous and creep deformation of AAS which arise from the capillary pressure was modeled. The results indicates the higher contribution of creep, about 2-3 times higher than shrinkage caused by capillary tension.
- Alternative Title
- 규산 나트륨 기반 알칼리 활성화 슬래그의 수화 및 수축에 대한 연구
- Alternative Author(s)
- Selamu Yihune Abate
- Department
- 일반대학원 건축공학과
- Advisor
- Hyeong-Ki Kim
- Awarded Date
- 2018-08
- Table Of Contents
- Table of Content 1
List of Tables 3
List of Figures 4
Abstract 5
Abstract in Korean 6
Chapter One: Introduction 7
1.1. Background 7
1.2. Research Objective 12
Chapter Two: Degree of hydration and Degree of reaction measurement methods 14
2.1. Introduction 14
2.2. Experimental program 14
2.2.1 Materials and mix proportion 14
2.2.2 Specimens preparation and Testing 16
2.3. Result and discussion 24
2.4. Chapter summary 36
Chapter Three: Hydration reaction modeling of alkali activated slag paste 37
3.1. Introduction 37
3.2. Experimental Program 38
3.2.1. Materials and mix proportion 38
3.2.2. Specimens preparation and Testing 38
3.3. Alkali activated slag reaction modeling 39
3.3.1. Stechiometric modeling 39
3.3.1.1. Reaction Model 42
3.3.1.2. Water retention 45
3.3.1.3. Chemical shrinkage 46
3.3.1.4. Porosity 48
3.3.2. Gibbs energy minimization modeling 49
3.3.3. Hydration kinetics modeling 51
3.3.3.1. Hygro-thermo-chemical method 52
3.3.3.2. Mass conservation equation method 56
3.4. Result and discussion 58
3.5. Chapter summary 73
Chapter Four: Shrinkage modeling of alkali activated slag paste 75
4.1. Introduction 75
4.2. Experimental Program 75
4.2.1. Materials and mix proportion 75
4.2.2. Specimens preparation and Testing 76
4.3. Autogenous Shrinkage Modeling 78
4.3.1. Causes for autogenous shrinkage 79
4.3.2. Modeling of Autogenous shrinkage using effective stress principle 83
4.4. Result and discussion 95
4.5. Chapter summary 104
Chapter Five: Conclusions 105
5.1. Summary 105
5.2. Limitations 107
5.3. Further studies 107
Reference 109
Acknowledgement 121
Curriculum Vitae 122
- Degree
- Master
- Publisher
- Chosun University, Architectural Engineering
- Citation
- 셀리무 이흐인 아베테. (2018). Hydration and autogenous shrinkage of sodium silicate based alkali activated slag.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/13584
http://chosun.dcollection.net/common/orgView/200000266850
- Appears in Collections:
- General Graduate School > 3. Theses(Master)
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