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Title: Diamond-coated versus conventional bits for rotary cutter head equipment
Authors: Construction Productivity Advancement Research Program (U.S.)
Campbell, Roy L., 1942-
Wong, G. Sam.
Keywords: Concrete removal
Diamond-coated bits
Rotary cutter bead equipment
Tungsten-carbide bits
Publisher: Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-95-3.
Description: Miscellaneous Paper
Abstract: The objectives of the research described in this report were to quantitatively demonstrate the diamond-coated-bit, cutter-boom head tool as an expedient, cost-effective concrete removal method for the rehabilitation of locks, dams, tunnels, and other similar structures and to provide real production and cost data for comparison with other removal methods. The results of the testing indicate that diamond-coated bits do not remove concrete any faster than conventional tungsten-carbide bits. The diamond-coated bit inserts appeared to wear less than the tungsten-carbide inserts but showed signs of impact damage. The estimated benefit of the diamond-coated bits having more than 10 times longer life than that of conventional bits could not be proved or disproved as testing was discontinued because of the excessive wear of bit shanks. The results of petrographic analysis showed that the impact of cutter bits induces microcracking in the concrete surfaces that remain after removal.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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