0187-893X 0187-893X S0187-893X2018000200017 10.22201/fq.18708404e.2018.1.63703 Chile Chile Chile 00 00 2018 00 00 2018 29 2 17 35

2014 53 4 4 977-83 ASTM G 102-89 1999 2016 19 1 1 187-94 2001 65 3 3 191-200 2007 49 8 8 3168-84 2009 51 5 5 971-8 2009 54 28 28 7435-43 2017 73 9 9 1-11 2006 51 1 1 821-3 2000 45 2 2 191-7 1989 274 1-2 1-2 345-8 2016 27 1 1 21-9 2003 2009 51 9 9 1964-75 2005 47 12 12 3202-15 1992 33 11 11 1719-34 2017 20 2 2 460-8 2015 31 26-32 2009 87 4 4 254-60 2006 62 10 10 843-55 2009 51 3 3 581-7