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Thermal stresses and temperature control of mass concrete /
Methods of controlling mass concrete temperatures range from relatively simple to complex and from inexpensive too costly. Depending on a particular situation, it may be advantageous to use one or more methods over others. Based on the author's 50 years of personal experience in designing mass...
| Clasificación: | Libro Electrónico |
|---|---|
| Autor principal: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
Kidlington, Oxford :
Butterworth-Heinemann,
�2014.
|
| Temas: | |
| Acceso en línea: | Texto completo |
Tabla de Contenidos:
- Note continued: 17.12.2. The Influence of Pipe Spacing on the Thermal Stress
- 17.12.3. The Influence of the Number of Stages of Pipe Cooling
- 17.13. Strengthen Cooling by Close Polythene Pipe
- 17.13.1. Effect of Cooling by Close Pipe
- 17.13.2. Influence of Cooling of Pipe with Small Spacing on the Thermal Stress
- 17.13.3. The Principle for Control of Pipe Spacing and Temperature Difference T0
- Tw
- 17.14. Advantages and Disadvantages of Pipe Cooling
- 17.15. Superficial Thermal Insulation of Mass Concrete During Pipe Cooling in Hot Seasons
- 18. Precooling and Surface Cooling of Mass Concrete
- 18.1. Introduction
- 18.2. Getting Aggregates from Underground Gallery
- 18.3. Mixing with Cooled Water and Ice
- 18.4. Precooling of Aggregate
- 18.4.1. Precooling of Aggregate by Water Cooling
- 18.4.2. Precooling of Aggregate by Air Cooling
- 18.4.3. Precooling of Aggregate by Mixed Type of Water Spraying and Air Cooling
- 18.4.4. Precooling of Aggregate by Secondary Air Cooling
- 18.5. Cooling by Spraying Fog or Flowing Water over Top of the Concrete Block
- 18.5.1. Spraying Fog over Top of the Concrete Block
- 18.5.2. Cooling by Flowing Water over Top of the Concrete Block
- 19. Construction of Dam by MgO Concrete
- 19.1. MgO Concrete
- 19.2. Six Peculiarities of MgO Concrete Dams
- 19.2.1. Difference Between Indoor and Outdoor Expansive Deformation
- 19.2.2. Time Difference
- 19.2.3. Regional Difference
- 19.2.4. Dam Type Difference
- 19.2.5. Two Kinds of Temperature Difference
- 19.2.6. Dilatation Source Difference
- 19.3. The Calculation Model of the Expansive Deformation of MgO Concrete
- 19.3.1. The Calculation Model of the Expansive Deformation for Test Indoors
- 19.3.2. The Calculation of the Expansive Deformation of MgO Concrete of Dam Body Outdoors
- 19.3.3. The Incremental Calculation of the Autogenous Volume Deformation
- 19.4. The Application of MgO Concrete in Gravity Dams
- 19.4.1. Conventional Concrete Gravity Dams
- 19.5. The Application of MgO Concrete in Arch Dams
- 19.5.1. Arch Dams with Contraction Joints
- 19.5.2. Arch Dams without Contraction Joints, Time Difference
- 19.5.3. Example of Application of MgO Concrete, Sanjianghe MgO Concrete Arch Dam
- 20. Construction of Mass Concrete in Winter
- 20.1. Problems and Design Principles of Construction of Mass Concrete in Winter
- 20.1.1. Problems of Construction of Mass Concrete in Winter
- 20.1.2. Design Principles of Construction of Mass Concrete in Winter
- 20.2. Technical Measures of Construction of Mass Concrete in Winter
- 20.3. Calculation of Thermal Insulation of Mass Concrete Construction in Winter
- 21. Temperature Control of Concrete Dam in Cold Region
- 21.1. Climate Features of the Cold Region
- 21.2. Difficulties of Temperature Control of Concrete Dam in Cold Region
- 21.3. Temperature Control of Concrete Dam in Cold Region
- 22. Allowable Temperature Difference, Cooling Capacity, Inspection and Treatment of Cracks, and Administration of Temperature Control
- 22.1.Computational Formula for Concrete Crack Resistance
- 22.2. Laboratory Test of Crack Resistance of Concrete
- 22.3. The Difference of Tensile Properties Between Prototype Concrete and Laboratory Testing Sample
- 22.3.1. Coefficient b1 for Size and Screening Effect
- 22.3.2. Time Effect Coefficient b2
- 22.4. Reasonable Value for the Safety Factor of Crack Resistance
- 22.4.1. Theoretical Safety Factor of Crack Resistance
- 22.4.2. Practical Safety Factor of Concrete Crack Resistance
- 22.4.3. Safety Factors for Crack Resistance in Preliminary Design
- 22.5. Calculation of Allowable Temperature Difference and Ability of Superficial Thermal Insulation of Mass Concrete
- 22.5.1. General Formula for Allowable Temperature Difference and Superficial Thermal Insulation
- 22.5.2. Approximate Calculation of Allowable Temperature Difference and Insulation Ability
- 22.6. The Allowable Temperature Difference Adopted by Practical Concrete Dam Design Specifications
- 22.6.1. Regulations of Allowable Temperature Difference in Chinese Concrete Dam Design Specifications
- 22.6.2. The Requirement of Temperature Control in "Design Guideline of Roller Compacted Concrete Dam" of China
- 22.6.3. Temperature Control Regulation of Concrete Dam by U.S. Bureau of Reclamation and U.S. Army Corps of Engineering
- 22.6.4. Temperature Control Requirements of Concrete Dam of Russia
- 22.7. Practical Examples for Temperature Control of Concrete Dams
- 22.7.1. Laxiwa Arch Dam
- 22.7.2. Toktogulskaya Gravity Dam
- 22.7.3. Dworshak Gravity Dam
- 22.8. Cooling Capacity
- 22.8.1. Calculation for the Total Cooling Capacity
- 22.8.2. Cooling Load for Different Cases
- 22.9. Inspection and Classification of Concrete Cracks
- 22.9.1. Inspection of Concrete Cracks
- 22.9.2. Classification of Cracks in Mass Concrete
- 22.10. Treatment of Concrete Cracks
- 22.10.1. Harm of Cracks
- 22.10.2. Environmental Condition of Cracks
- 22.10.3. Principle of Crack Treatment
- 22.10.4. Method of Crack Treatment
- 23. Key Principles for Temperature Control of Mass Concrete
- 23.1. Selection of the Form of Structure
- 23.2. Optimization of Concrete Material
- 23.3. Calculation of Crack Resistance of Concrete
- 23.4. Control of Temperature Difference of Mass Concrete
- 23.4.1. Temperature Difference Above Dam Foundation and Temperature Difference Between Upper and Lower Parts of Dam Block
- 23.4.2. Surface
- Interior Temperature Difference
- 23.4.3. Maximum Temperature of Concrete
- 23.5. Analysis of Thermal Stress of Mass Concrete
- 23.5.1. Estimation of Thermal Stress
- 23.5.2. Primary Calculation of the Temperature Stress
- 23.5.3. Detailed Calculation of Thermal Stress
- 23.5.4. Whole Process Simulation Calculation
- 23.6. Dividing the Dam into Blocks
- 23.7. Temperature Control of Gravity Dam
- 23.8. Temperature Control of Arch Dam
- 23.9. Control of Placing Temperature of Mass Concrete
- 23.10. Pipe Cooling of Mass Concrete
- 23.11. Surface Thermal Insulation
- 23.12. Winter Construction
- 23.13. Conclusion.