Mass Concrete Any large volume of concrete cast in place intended to resist applied loads by virtue of mass. Generally a monolithic structure incorporating a low cement factor with a high proportion of large coarse aggregate.
http://www.moxie-intl.com/glossary.htm

Vedacit Impermeabilizantes - Qualidade e Tecnologia Otto Baumgart. .
... Concreto massa = Concreto executado em volume de grandes dimensões que exige medidas para reduzir a geração do calor de hidratação do cimento. ...
www.vedacit.com.br/_novo2003/perfil/co.php?p=glossario&a=gl...

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Note added at 2 hrs 23 mins (2005-08-30 06:23:33 GMT)
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Field Reference Manual - ACI SP-15(99)
Specifications for Structural Concrete ACI 301-99
An absolute must for anyone who makes their living with concrete. This document covers production, placing, finishing, curing and formwork design/construction. Repair of surface defects and finishing of formed and unformed surfaces are specified. Separate sections are devoted to architectural concrete, lightweight concrete, MASS CONCRETE, prestressed concrete, and shrinkage-compensating concrete. Provisions governing testing, evaluation, and acceptance of concrete, as well as acceptance of the structure, are included.
http://www.ascconline.org/category.asp?cat=GENERAL CONCRETE