AlllOt 4 30L35 y < NBS PUBLICATIONS l. J NBSIR 82-1658 y MECHANICAL PROPERTIES OF CONCRETE MORTAR AT LOW TEMPERATURES J. M. Arvidson L. L. Sparks E. Steketee National Bureau of Standards U.S. Department of Commerce Boulder, Colorado 80303 February 1982 — QO— 100 ,1156 32-1653 1932 c. 2