Partially set concretes are the concretes left exposed idle till the time of casting. These concretes are neither fully fresh nor fully dead, but are in between these two. Even to day no information about the systematic study on the behaviour of partially set concretes is available in published literature or elsewhere. The experience gained from the extensive pioneering works of the author for over three decades or so in this area on varieties of concretes, led the author to formulate the technical theory, and propose an altogether new concept namely, Selfing and Crossing, which forms the subject matter dealt elaborately and vividly in this present book.
The concept of Selfing and Crossing along with several illustrations of practical importance has been explained first, which is followed by categorization and definitions of various types of Selfing and Crossing. The efficiency and usefulness of the proposed Selfing and Crossing formulations have been demoilstrated on a large variety of practical field problems providing step by step calculation procedure in details with suitable explanations and remarks. The book ends with Critical Remarks on various phases and items along with hints of probable scope for future extension for which an Appendix on Spring Function has been added. This book will be of great help to the students of UG, PG and research scholars of Civil engineering. Persons involved in concreting work at site, or in design of concrete structures, will also be equally benefited.
ABOUT THE AUTHOR Nisith K Bairagi
Dr. Nisith K. Bairagi is a structural engineer by profession. He obtained Bachelor degree from Jadavpur University, Kolkata (1963). From BE College, Shibpur, he obtained Master (Civil) degree (1967), and completed Technical Teachers' Traineeship (1968) in the same college. After joining IIT Bombay as a faculty (1971) in Civil Engineering Department, he obtained PhD (Structures) in 1982. Dr. Bairagi was actively engaged in teaching (UG and PG) and research in the field of Structural Mechanics, Plate and Shell Structures, Concrete Structures and Concrete Technology. He retired from IIT Bombay as Professor of Civil Engineering (2004) after an active service period of about 33 plus years.
Dr. Bairagi has several pioneering original contributions to his credit, mention worthy are: on Selfing and Crossing Concept (Concrete Technology), Pre- and Post-twisted R C Beams (Concrete Structures), Shell-Deck Bridges (Bridge Structures). Reference of these works are available in a large number of research papers published in reputed journals in India and abroad, M Tech as well as PhD theses (three PhDs were supervised by Dr. Bairagi on his own concept of Selfing and Crossing), submitted at IIT Bombay. He authored four books in Structural Engineering subjects.
During teaching and research carrier (1971-2004), while handling theory and analysis of structural engineering subjects, the interest generated in circular-hyperbolic type of functions, (which is often used as an important tool for the solution of fourth as well as eighth order differential equations, frequently encountered in structural engineering problems, such as in Beams on Winkler's Foundation and in thin Cylindrical shells), led Dr. Bairagi to search and formulate for a more general type of function of this category. The present book is the result of his search and research.
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