Title:
Inclined Plane Test to Evaluate Structural Buildup at Rest of Self-Consolidating Concrete
Author(s):
Kamal Henri Khayat, Ahmed F. Omran, and Trimbak V. Pavate
Publication:
Materials Journal
Volume:
107
Issue:
5
Appears on pages(s):
515-522
Keywords:
inclined plane; rheology; self-consolidating concrete; structural breakdown; structural buildup; thixotropy; viscosity; yield stress
DOI:
10.14359/51663972
Date:
9/1/2010
Abstract:
After casting, concrete flow resistance increases due to physical restructuring and cement hydration, thus affecting some key characteristics of the material, including segregation resistance, lateral pressure exerted on formwork, and bond between successive lifts. A systematic program was undertaken to evaluate the structural buildup of self-consolidating concrete (SCC) using a novel inclined plane method. The critical angle of the plane at the commencement of movement of the sheared material placed onto a roughened surface is used to determine static yield stress. Repetitive tests carried out on SCC indicate that the rate of structural buildup has a relative error of 7 to 9%, depending on thixotropic level and shear history. Comparisons carried out with 29 SCC mixtures of various compositions demonstrate that yield stress characteristics determined using the inclined plane method are comparable to those measured using a concrete rheometer (R2 = 0.82).