New Releases by Bruce Foster

This book is the record of a personal journey by two men, a writer and a photographer, into the rural heartland of New Zealand. covers musters in Glenray Station deep in the high back country of Southland. From that experience grew the idea of taking part in different kinds of sheep and cattle musters throughout N.z. from the rivers of Westland to the dunes of Northland, from the remote east coast to the South Island''s vast Molesworth Station.

Although concrete admixtures are chemicals in a literal sense, by convention in concrete technology, the term "chemical admixture" is restricted to water-soluble substances other than air-entraining agents. Most chemical admixtures react chemically with the cement in concrete. This discussion will be confined to set-controlling and water-reducing admixtures. Chemical admixtures of other types are classified and described in a recent report of the American Concrete Inst. [1]. A water-reducing admixture is defined as one that reduces the quantity of mixing water required to produce concrete of a given consistency; a retarding admixture as one that retards the setting of concrete; an accelerating admixture as one that accelerates the setting and early strength development of concrete; a water-reducing and retarding admixture as one that reduces the quantity of mixing water required to produce concrete of a given consistency and retards the setting of concrete; and a water-reducing and accelerating admixture as one that reduces the quantity of mixing water required to produce concrete of a given consistency and accelerates the setting and early strength development of concrete. These five types of admixtures are referred to in ASTM Specifications for Chemical Admixtures for Concrete (C 494 - 63 T) as Types A, B, C, D, and E, respectively.