Eleven laboratories participated in an inter-laboratory study to determine the precision of AASHTO T 303, The Test Method for Accelerated Detection of Potentially Deleterious Expansion of Mortar Bars due to Alkali Silica Reaction.
The Indiana Department of Transportation recently studied the use of the National Ready-Mixed Concrete Association (NRMCA) correction factor in the New Hampshire Department of Transportation's water-to-cement ratio formula. This correction factor accounts for the amount of coarse aggregate in a sample. Results show that with proper sampling techniques and applications of the correction factor, the microwave oven method gives a water-to-cement ratio with a level of accuracy better than 0.01.
In order to facilitate standardization and improvements, FHWA proposes several activities.
Due to potential health and environmental impact from using chlorinated hydrocarbon solvents, the FHWA Central Federal Lands Highway Division's Central Laboratory sought alternative solvents for laboratory work in 1998. Ensolv was adopted for cleaning and solvent extraction of asphalt from bituminous mixtures.
Summary of what constitutes a qualified technician.
Training materials developed by the Multi-Regional Training and Certification Group.
Summary of what constitutes a qualified laboratory program.
Summary list of current aggregate research.
Who is the Materials Group?