Laboratory investigation of 4-1/2-in. aggregate concrete mixtures with high water-cement ratios
Tynes, W. O. (William O.)
Technical reportAbstract: A series of six lean mass concrete mixtures containing crushed limestone aggregate graded to 4-1/2-in. maximum size, both with and without fly ash, were proportioned with water-cement ratios of 0.8, 0.9, and 1.0, by weight. Tests for workability, compressive strength, permeability, and durability were made on samples and specimens from these mixtures. The tests were designed to either validate or disprove the assumption that a water-cement ratio 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 proper ties of concrete containing the 4-1/2-in. maximum size aggregate with those containing 3-and 6-in. maximum size aggregates. The results indicate that it is possible and practical to proportion a 4-1/2-in. maximum size aggregate concrete mixture with a water-cement ratio of up to 1.0 that apparently possesses adequate strength and impermeability to be used in interior massive sections of concrete structures. The test results also indicate that the 4-1/2-in. aggregate concrete is equal to the similarly proportioned 6-in. aggregate concrete in workability, strength, impermeability, and durability.
Concrete Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Concrete aggregates; Concrete mixtures; Limestone; Water-cement ratio
Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-72-3.
Approved for public release; distribution is unlimited.