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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Bonding Of New Concrete to Old At Horizontal Construction Joints
Author(s): Raymond E. Davis and Harmer E. Davis
Publication: Journal Proceedings
Appears on pages(s): 422-436
Abstract:Presents results of tests to determine the rela-tive efficiency of various methods of bonding new concrete to old under conditions similar to those that exist along horizontal construction joints in dams. Authors discuss the effect of several methods of placement and several methods of ioint treat-ment on: permeability along plane of jioint, bond strength as indicated by the flexure test, and quality of concrete as indicated by unit weight and compressive strength. Methods of compaction were hand tamping, internal vibratory tamping and combined internal and surface vibratory tamping. Methods of surface cleanup were wirebrushing, scour in with air-water jet before final set cleaning wit high-pressure air after final set. In some cases, lifts were deposited directly on the surface of the previous lift; in other cases, of mortar was flushed on the old surface first. he T following variables were included: richness of mix type of cement, consistency of concrete, period of exposure of lower lift to drying in warm air time interval between lifts, and age of concrete at test.
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