Work Item
ASTM WK77981
Revision of E518/E518M-21 Standard Test Methods for Flexural Bond Strength of Masonry
Rationale
A review of this test method shows that it allows both third-point loading (Test Method A) and uniform loading with an air bag (Test Method B). Uniformly distributed loading produces a moment distribution that is significantly different than third-point loading. Researchers have shown that the mean strength determined from uniform loading was 1.97 to 1.99 times the mean strength determined using two concentrated loads, each at the quarter-point3,4 in larger format tests. This suggests that the two methods are not equivalent, and that third-point loading is more conservative and realistic than uniform loading. This ballot item proposes to add a note discussing this and recommends use of third-point loading for this small assembly test. This is consistent to Note 2 in C 1717.
Work Item Status
Date Initiated: 08-10-2021
Technical Contact: William McGinley
Item: 023
Ballot: C15 (21-03)
Status: Will Reballot Item
Item: 024
Ballot: C15 (22-02)
Status: Will Reballot Item
Item: 047
Ballot: C15 (22-04)
Status: In Balloting