The purpose of the investigation was to either validate or disprove the assumption that a water-cement ratio (W/C) in excess of 0.8 by weight for interior concrete containing 4-1/2-in. maximum size aggregate can be used in mass concrete construction, and to compare the properties of concrete containing 4-1/2-in. maximum size aggregate with those of the concretes containing 3- and 6-in. maximum size aggregates. The investigation consisted of a laboratory test program in which a series of six lean mass concrete mixtures, both with and without pozzolan, containing 4-1/2-in. maximum size aggregate were proportioned with identical W/C's that had been selected from the work of a previous investigation. Specimens were cast and tests were made to evaluate the mixtures for workability, strength, permeability, and durability.

Advances in Ready Mixed Concrete Technology contains the proceedings of the first International Conference on Ready-Mixed Concrete held at Dundee University in Scotland from September 29 to October 1, 1975. Contributors focus on the significant progress that has been made in ready mixed concrete technology. Some practices are highlighted along with possible areas for research. This text is organized around seven themes; the first of which deals with plant and equipment. Production methods and their development in the ready mixed concrete industry are reviewed, along with developments in batching plant and equipment to meet the needs of the ready mixed concrete industry. The chapters that follow explore the materials used in making concrete, properties of fresh and hardened concrete, mix design and quality control, and transportation and placing. The final section discusses the economics of ready mixed concrete, with emphasis on the cost of placing concrete by pump and the relative economics of alternative materials in Portland cement concrete. This book will be of interest to ready mixed concrete producers, their customers in the construction industry, and their suppliers of concrete materials, plant, and equipment.