Grading Curve Definition
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Aggregates in Concrete
Bringing together in one volume the latest research and information, this book provides a detailed guide to the selection and use of aggregates in concrete. After an introduction defining the purpose and role of aggregates in concrete, the authors present an overview of aggregate sources and production techniques, followed by a detailed study of their physical, mechanical and chemical properties. This knowledge is then applied to the use of aggregates in both plastic and hardened concretes, and in the overall mix design. Special aggregates and their applications are discussed in detail, as are the current main specifications, standards and tests.
The Theory and Practice of Grading Writing
Author: Frances Zak
language: en
Publisher: State University of New York Press
Release Date: 1998-02-05
CHOICE 1998 Outstanding Academic Books Grading is one of the thorniest issues writing teachers must deal with, yet, surprisingly little has been written on this topic. As writing teachers move increasingly toward practices that focus on writing as a process, they face a growing need to reconsider their systems of grading to determine whether or not these systems support their pedagogies. The authors interrogate the grading of individual papers as well as portfolios and the assigning of end-of-term grades. This collection explores the issues and problems that have emerged as conventional grading practices have lagged behind and been challenged by new theories of language. While the book will be of interest to theorists, Zak and Weaver have also made the book relevant and useful to teachers whose primary interest is the practical consequences of theory in their classrooms. Where theoretical discussion takes place, the language is clear and accessible. Many of the authors write directly from personal experience, telling stories of the classroom or writing of new techniques and approaches they have tried. They speak with the voices of teachers, and the tone and content of their words convey a sense of the immediacy of the topic.
Bentonite Handbook
Author: Steffen Praetorius
language: en
Publisher: John Wiley & Sons
Release Date: 2017-03-17
Pipe jacking is a construction process for the no-dig laying of pipes. Successful pipe jacking demands low skin friction between the ground and the jacked pipe. This is achieved with bentonite lubrication. The bentonite slurry fed into the annular gap fulfils several purposes. It stabilises the annular gap by supporting the surrounding ground and reduces friction contact between ground and jacked pipe. The Bentonite Handbook deals comprehensibly with the relevant aspects of annular gap lubrication: starting with the ground conditions, which are of decisive importance for lubrication, through the rheological properties of the bentonite slurry to the technical components of lubrication technology and lubrication strategy. The use of standardised measuring apparatus is described as well as mixing equipment and the automatic lubrication system. Overview tables with calculations and suggested values for bentonite consumption quantities depending on the prevailing ground conditions and the pipe jacking parameters complete the recommendations.