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...

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Bibliographic Details
Main Author:	Bofang, Zhu (Author)
Format:	eBook
Language:	English
Published:	Kidlington, Oxford : Butterworth-Heinemann, ©2014.
Subjects:	Concrete > Thermal properties. Concrete > Effect of temperature on. Electronic books.
Online Access:	Connect to the full text of this electronic book

Table of Contents:

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.