Cold Weather Concreting

ISBN-13: 9780849382871 / Angielski / Twarda / 1997 / 236 str.

B. A. Krylov; Boris A. Krylov; W. F. Chen

Opis

Concreting in cold weather requires special knowledge and skills to ensure accelerated hardening and high quality in plain- and reinforced-concrete structures. Cold Weather Concreting familiarizes concrete specialists with the characteristic features of concrete in cold weather, including the effects of frost, methods for hardening in subzero temperatures, and other challenges in cold-weather concreting. Both practical techniques and their underlying theories are covered.
The book presents many methods for the thermal treatment of concrete by means of electric current--information previously available only in the Russian literature. It presents unique data in the form of diagrams, drawings, and tables, including a chart of the phase state of concretes of different strengths in the process of freezing at different temperatures, the variation of concrete strains in freezing and thawing, and a diagram of electric fields in concrete when electrodes are placed in front of stirrups.

Spis treści

1. Winter ConstructionSpecific Features of WinterConcreting in Winter ConditionsProblems of Winter Concreting2. Effects of Frost on the Structure and Properties of ConcreteModern Views on the Hardening of ConcreteThe Phase State of Water in Concrete at Different TemperaturesThe Mechanism of Deterioration of Concrete Due to Early FreezingPrecuring of Concrete Before FreezingEffects of Early Freezing on Concrete PropertiesConcrete in the Frozen State and its Basic Properties3. Preparations for Concreting in Winter Conditions4. Concretes Containing Antifreeze AdmixturesThe Principle of the Method and its TheorySelection and Assignment of Antifreeze AdmixturesProcedures5. Thermos CuringThe Principle and Application of the Thermos MethodPlacement and Curing of Concrete in Structures Built on Permafrost GroundCuring and Cooling of Concrete in Massive Structures6. Electric Contact Heating of ConcreteThe Principle and Application of the MethodHeaters for Electric Contact HeatingHeating Formworks Covered with Conductive MaterialsApplication of Electric Contact Heating of Concrete7. Electrode Heating of ConcreteElectric Conductivity of ConcreteProcesses in Concrete Caused by Electric Current Passing Through itElectrodes for Electric Heating of ConcreteProcesses at the Interface of Concrete and an ElectrodeElectric and Thermal Fields in Electric HeatingExternal Mass Exchange in Electric HeatingElectrode Heating Procedures8. Electric Preheating of Concrete MixturesGeneral Considerations and the Principle of the MethodThe Theoretical Background of the Accelerated Heating of Concrete MixturesInternal Heat Exchange During the Accelerated Electric Heating of ConcreteChanges in Plastic Properties of Concrete Caused by Accelerated HeatingPhysical-Mechanical Properties of Concrete Subjected to Accelerated HeatingEquipment for Electric Preheating of Concrete MixturesConcreting Procedures with Preheated Concrete MixturesPreheating of Concrete Mixtures in Truck Mixers9. Induction Heating of ConcreteThe Principle and Application of the MethodDetermining Basic Parameters of HeatingInduction Heating of Concrete in Framed Structures10. Sealing Joints Between Precast Units and Between Precast and Cast-in-Place Members in Composite ConstructionSpecific Features of Joints Between Precast Concrete UnitsErection of Precast Concrete UnitsCuring of Sealing Concrete in Joints11. Curing of Cast-in-Place Concrete in EnclosuresThe Principle of the Method and Types of EnclosuresCuring of Concrete in EnclosuresAir Exchange in EnclosuresConcreting in Enclosures12. Some Problems of Economics of Winter ConcretingAppendix - Specific Power Values Required to Heat Concrete with Strip Electrodes Placed on One SideReferencesIndex

O autorze

Boris Alexandrovich Krylov, born in 1926, is a doctor of engineering, professor, and academician of the Academy of Architectural and Building Sciences of Russia, of the Russian Engineering Academy, and of the International Academy of Informatization. Dr. Krylov is an expert in the field of construction under extreme conditions, including Arctic and permafrost regions and regions with dry, hot climate, and in problems relating to acceleration of concrete hardening rate at precast concrete factories and at building sites. He is the author of more than 300 publications, inventions and patents. Dr. Krylov represented the U.S.S.R. at the Reunion Internationale des laboratoires d’essais et de recherches sur les materiaux et les constructions (RILEM) for many years, heading the Technical Committee on Winter Concreting (39-BH) in this organization. He presently is Deputy Director for Research of the Research Institute of Concrete and Reinforced Concrete in Moscow and a professor at Moscow State University of Construction.