SYMPOSIA PAPER Published: 01 January 1999
STP14201S

Unbonded Capping for Concrete Masonry Units

Source

Due to the manufacturing process, the bearing surfaces of concrete masonry units are often somewhat rough and uneven. Therefore, concrete masonry units must be capped when tested in compression according to ASTM C 140-96, Standard Test Methods of Sampling and Testing Concrete Masonry Units. Capping of concrete masonry units is time consuming and expensive. Several studies of compression tests on concrete cylinders indicate that the use of elastic pads in rigid retaining caps give similar compressive strength results to approved capping methods. An unbonded capping system for concrete masonry units similar to that described in ASTM C 1231-93, Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders, was developed. The average compressive strength results obtained when using the unbonded capping system ranged from 92–94% of the average compressive strength results obtained when using ASTM C 140-96 approved methods. Further, use of the unbonded capping system was found to increase productivity and substantially reduce testing cost.

Author Information

Crouch, LK
Tennessee Technological University, Cookeville, TN
Knight, ML
Tennessee Technological University
Henderson, RC
Tennessee Technological University, Cookeville, TN
Sneed, WA
WASCO, Nashville, Tennessee
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Details
Developed by Committee: C15
Pages: 62–74
DOI: 10.1520/STP14201S
ISBN-EB: 978-0-8031-5404-9
ISBN-13: 978-0-8031-2600-8