Characterization of Fly Ash Reactivity by Isothermal Conduction Calorimetry

1987 ◽  
Vol 113 ◽  
Author(s):  
David J. Cook ◽  
H. Trinh Cao ◽  
Daksh Baweja

SUMMARYThe reactivity of fly ash is generally difficult to determine because neither a single physical nor chemical property nor any combination of these can be used characterize a particular sample completely. A direct reflection of this is the range of pozzolanicity tests proposed by standards worldwide and the applicability and relevance of such tests is currently being debated.In many countries, codes of practice and standards relating to fly ashes are currently under review. Some work has been carried out in countries including Australia, United Kingdom, and the United States on commercial fly ashes with a view to possible classification and implementation into standards [1-2]. It is generally recognized that current standards on fly ash do have some inadequacies with regard to performance prediction when included in concrete. Fineness requirements for fly ash for use in structural concrete (BS3892: Part 1) in the United Kingdom are currently being debated [2] with many workers suggesting that it would be possible to produce durable concrete with ashes which would not comply with the requirements of the standard [3].

1995 ◽  
Vol 59 (3) ◽  
pp. 1-15 ◽  
Author(s):  
Thomas S. Robertson ◽  
Jehoshua Eliashberg ◽  
Talia Rymon

The authors focus on NPA signals, which they define as new product announcements in advance of market introduction. They develop a set of hypotheses regarding incumbent reactions to NPA signals and test them in a field study among managers in the United States and the United Kingdom. The authors’ findings provide a characterization of the factors affecting the likelihood of competitive response to NPA signals and suggest a set of managerial implications.


Author(s):  
Breen Creighton ◽  
Catrina Denvir ◽  
Richard Johnstone ◽  
Shae McCrystal ◽  
Alice Orchiston

The purpose of the research upon which this book is based was empirically to investigate whether the ballot requirements in the Fair Work Act do indeed impose a significant obstacle to the taking of industrial action, and whether those provisions are indeed impelled by a legitimate ‘democratic imperative’. The book starts from the proposition that virtually all national legal systems, and international law, recognise the right to strike as a fundamental human right. It acknowledges, however, that in no case is this recognition without qualification. Amongst the most common qualifications is a requirement that to be lawful strike action must first be approved by a ballot of workers concerned. Often, these requirements are said to be necessary to protect the democratic rights of the workers concerned: this is the so-called ‘democratic imperative’. In order to evaluate the true purpose and effect of ballot requirements the book draws upon the detailed empirical study of the operation of the Australian legislative provisions noted above; a comparative analysis of law and practice in a broad range of countries, with special reference to Canada, South Africa, the United Kingdom and the United States; and the jurisprudence of the supervisory bodies of the International Labour Organisation. It finds that in many instances ballot requirements – especially those relating to quorum – are more concerned with curtailing strike activity than with constructively responding to the democratic imperative. Frequently, they also proceed from a distorted perception of what ‘democracy’ could and should entail in an industrial context. Paradoxically, the study also finds that in some contexts ballot requirements can provide additional bargaining leverage for unions. Overall, however, the study confirms our hypothesis that the principal purpose of ballot requirements – especially in Australia and the United Kingdom – is to curtail strike activity rather than to vindicate the democratic imperative, other than on the basis of a highly attenuated reading of that term. We believe that the end-result constitutes an important study of the practical operation of a complex set of legal rules, and one which exposes the dichotomy between the ostensible and real objectives underpinning the adoption of those rules. It also furnishes a worked example of multi-methods empirical, comparative and doctrinal legal research in law, which we hope will inspire similar approaches to other areas of labour law.


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