ASTM Concrete Committee Developing Bleed-Stability Standard ASTM International Committee C09 on Concrete and Concrete Aggregates is currently developing a proposed standard that addresses bleed stability
ASTM Concrete Committee Developing Bleed-Stability Standard ASTM International Committee C09 on Concrete and Concrete Aggregates is currently developing a proposed standard that addresses bleed stability. ASTM 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.
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 encasement concrete for the P-T duct and result in misalignment of base plates, plus costly bearing and equipment failure.
ìThe proposed ASTM standard uses less material, produces quantitative comparative results, is much faster than existing methods and is usable in both laboratory and field conditions,î says Fred Goodwin, fellow scientist, BASF Construction Chemicals, and the incoming chair of C09.41. Specifiers, grouting contractors, material suppliers and testing laboratories will be the most likely users of ASTM WK28156 once it has been approved, he says.
All interested parties are welcome to participate in the ongoing development of ASTM WK28156, particularly in the realm of inter-laboratory testing for the proposed standard. ASTM Committee C09's next meeting is Dec. 6-8, in New Orleans