Powers, T. C. <br/><br/>
Theory of volume changes in hardened portland cement paste -during freezing / by T. C. Powers and R. A. Helmuth. 

 - Chicago : atories 
 - [18] p. 
 - Bulletin 46 / Portland Cement Association .
<br/><br/> "Authorized reprint from Proceedigns of the Highway Researc-h Board vol. 32, p. 285 (1953)".