When cementitious grouts bleed, mixing water separates from the binder, causing a number of problems. Bleed water will allow corrosion to occur in stressed steel strand, which is what holds a building together. Sufficient corrosion can result in catastrophic failure.
In addition, trapped bleed water can cause spalling of the encasement concrete for the P-T duct and can result in misalignment of base plates and costly bearing and equipment failure.
ASTM International Committee C09 on Concrete and Concrete Aggregates is currently developing a proposed standard that addresses bleed stability. WK28156, Test Method for Bleed Stability of Cementitious Grout Under Static Pressure, is under the jurisdiction of ASTM International Subcommittee C09.41 on Hydraulic Cement Grouts.
“The proposed standard uses less material, produces quantitative comparative results, is much faster than existing methods and is usable in both laboratory and field conditions,” says Fred Goodwin, fellow scientist, BASF Construction Chemicals, and the incoming chairman of C09.41.
All interested parties are welcome to participate in the ongoing development of WK28156, particularly in the realm of interlaboratory testing.
Technical Information: Fred Goodwin, BASF Construction Chemicals, Cleveland, Ohio
ASTM Staff: Scott Orthey