Infrastructure	Materials Group

Features

• Alkali-Silica Reactivity Interlaboratory Testing

  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.

• Determination of Water-to-Cement Ratio In Fresh Concrete Using Microwave Oven (PDF File, 86 KB)

  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.

• Pavement Smoothness

  In order to facilitate standardization and improvements, FHWA proposes several activities.

• Bituminous Solvent Summary Notice

  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.

• Technician Qualification Memorandum

  Summary of what constitutes a qualified technician.

• Technician Qualification Training Materials

  Training materials developed by the Multi-Regional Training and Certification Group.

• Laboratory Qualification Memorandum

  Summary of what constitutes a qualified laboratory program.

• Aggregate Research

  Summary list of current aggregate research.

• Materials Archives

• Smoothness Questions

• Recycled and Secondary Materials Case Studies

Who is the Materials Group?
Training