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in recent years. The DTA technique has been widely applied in clay mineralogy and only since a decade and a half has it been adopted as an important tool in cement chemistry. Within this period it has attained so much recognition, as evidenced by' the phenomenal growth of publications, that it is difficult to conceive of a cement laboratory without the facilities of a DTA apparatus.
The results pertaining to the application of DTA to cementitious materials are widely scattered and hence the Director, Division of Building Research, National Research Council of Canada, assigned me the task of preparing a comprehensive and critical paper on the subject-which I presented at the 42nd meeting of the Highway Research Board held in 1964 in Washington. The reaction of cement chemists during and subsequent to the meeting was so encouraging that the Chemical Publishing Co., New York, felt the need of a book incorporating the existing knowledge on the application of DTA to cementitious materials. It is needless to say that a sound knowledge of the DTA technique and of cement chemistry is essential for a correct interpretation of differential thermograms. Hence necessity was felt for the inclusion of (i) the treatment of the DTA technique and its applicability, (ii) chemistry of cementitious materials, and (iii) the application of DTA to inorganic cements. The book treats the essentials of the first two and lays emphasis on the third. The book, as the title suggests, is intended primarily for those engaged in research on cement chemistry and other allied fields. However, ideas
developed in the use of DTA to cement chemistry problems could be profitably applied to any other branch of study.
No attempt has been made to provide an exhaustive bibliography, but the list of references given at the end of each chapter or sub-chapter should serve as a reasonably good guide for further reading on the topics covered. I would like to express my gratitude to Prof. Dinesh Mohan, Director, Central Building Research Institute, Roorkee, for his constant encouragement and permission to write the book. I acknowledge my thankfulness to Dr. T.L. Webb, Director, South African National Building Research Institute, for his valuable comments on the book. Mr. P.L.De was kind enough to translate some of the important German publications of relevance to this book, which I gratefully acknowledge. Thanks are also due to Mr. P.S. Shankar, Scientist, Publication Directorate, Council of Scientific and Industrial Research, New Delhi, for checking the manuscript, and to Mr. Krishan Lal for his accurate typing of the manuscript in the final form. To my wife Vasundhara, who devotedly undertook the task of typing the draft, assisting me in reading the proof, and preparation of indexes, l owe my especial thanks. I am grateful to authors, publishers of journals, and organizations who permitted me to reproduce figures and tables from their publications.
August 1967 v. S. Ramachandran