01361501

Component

https://doi.org/10.3141/2240-03

http://scholar.google.com...zari&publication_year=2011

The flow table is a standardized test that is widely used to qualify a mortar for compressive strength and air content. The flow table is also the only standard test to quantify the workability of a mortar. Therefore, the calibration of this device is paramount, and it is done today by preparing a reference material consisting of a mixture of silica powder and oil. The two materials are mixed; tests are performed with the use of the reference flow table located in the Cement and Concrete Reference Laboratory. This flow table is identical to commercial versions currently used, and the values obtained with this flow table are considered the reference values for calibrating flow tables in the United States. This is an empirical procedure and relies heavily on one device that could break or generate results that can drift over time. This study reviewed the manufacturing process of the reference material, provided historical data, and proposed a more scientifically based approach to develop an improved reference material.

01361506

11-1248

English

pp 16-21

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167581

Print

Figures (6) ; References (5) ; Tables (3)

Air content; Calibration; Compressive strength; Concrete; Testing equipment; Workability

Flow table tests; Reference materials (Analytical chemistry)

Highways; Materials; I32: Concrete

TRIS, TRB, ATRI

Jan 13 2012 3:59PM

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• Effect of Fiber Addition, Heat Treatment, and Preset Pressure on Mechanical Properties of Ultra-High-Strength Mortars
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• Efforts to Improve Quality Assurance and Quality Control of Concrete in Virginia
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• Heat of Hydration for Cement: Statistical Modeling
• Optimizing Aggregates to Reduce Cement in Concrete Without Reducing Quality
• Role of Potassium Acetate Deicer in Accelerating Alkali–Silica Reaction in Concrete Pavements Relationship Between Laboratory and Field Studies
• Thermophysical Optimization of Specialized Concrete Pavement Materials for Collection of Surface Heat Energy and Applications for Shallow Heat Storage