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Title: Investigation of methods of preparing horizontal construction joints in concrete. Report 1
Authors: U.S. Army Engineer Waterways Experiment Station
Keywords: U.S. Army Engineer Waterways Experiment Station
Concrete construction
Concrete joint
Concrete Strength
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; no. 6-518 rept.1.
Description: Technical Report
Abstract: A series of strength (shear, tensile, and flexural) and permeability tests were made using simulated interior mass concrete to evaluate methods of preparing horizontal construction joints. The results indicated that: thorough cleaning of the lower surface was essential to obtaining a strong joint; keeping joint surfaces wet for several hours prior to placing the new concrete appeared to decrease joint strength; placing mortar on the lower surface immediately before the fresh concrete was placed rather than placing concrete on concrete appeared to decrease joint strength; leaving the texture of the lower surface rough so as to obtain the benefit of the mechanical keying action of the larger aggregate particles did not improve joint strength; no significant difference was noted in quality of the joints because of aggregate size; cleaning surfaces that had been treated with a retarder by water jet allowed the formation of joints superior to those formed by surfaces that had been neither retarded nor cleaned. The incomplete removal of the retarded layer of concrete did not impair the integrity of the joint later made against it.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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