Robert L. Nelson
Robert L. Nelson is President of Robert L. Nelson & Associates, Inc. Construction Materials Laboratory.
2 articles by Robert L. Nelson:
technical
Field Testing of Mortar

The American Society for Testing and Materials (ASTM) has developed two distinct standards for testing masonry mortars: ASTM C 270 and ASTM C 780. Full story
masonry
Autoclaved Aerated Concrete