0120-6230 0120-6230 S0120-62302016000300056 10.17533/udea.redin.n80a07 Colombia Colombia Colombia 00 07 2016 00 07 2016 80 56 62

2000 50 6 6 657-65 2012 2014 70 9-17 2006 2009 135 6 6 723-34 1968 1 2008 3-36 2007 American Society for Testing Materials (ASTM) 2007 American Society for Testing Materials (ASTM) 2007 American Society for Testing Materials (ASTM) 2014 American Society for Testing Materials (ASTM) 2014 American Society for Testing Materials (ASTM) 2014