PENGARUH VARIASI CAMPURAN PASIR SILIKA DENGAN WATERGLASS TERHADAP PERMEABILITAS DAN KEKUATAN TEKAN PADA PEMBUATAN INTI (NAKAGO)

Abstract

The purposes  of this study  are  to determines: (1)  the  variation  effect of silica sand  andwaterglass mixture through permeability for manufacturing core (nakago). (2) the variation effect of silica sand and waterglass mixture through compressive strength of the core (nakago) making.(3)  the  optimal  price  of  the  permeability  and  the  compressive  strength  of  the  core  (nakago) making.  This  research  was  conducted  at  the  Polytechnic  Metal  Testing  ManufacturingLaboratory  in  Ceper  using  primary  materials  such  as  silica  sand  and  waterglass.  The  research method used in this study  is  an experimental method. The independent variable in this study  wasthe waterglass  variations  in  5%,  15%,  20%,  and 25%  level,  and the  dependent variables  are  the permeability and compressive strength.Results  of  this  study  are:  (1)  The  addition  of  waterglass  at  5%  become  15%  level  is increase, while  the  15%  become  20%  and  20%  become  25%  are  decrease.  (2)  Increasing  in anumber of  waterglass  level  will increase  the compressing    strength.  (3)  Waterglass Variation  in the level of  5%,  15%,  20%,  and  25%  obtain a permeability  row  90.33,  139.33,  115.30,  91.22, and  the  compressive  strength  11.33,  12,  20,  12.93,  16.50.  The  smallest  permeability  of waterglass  occurred  at  5%  ie  90.33  and  compressive  strength  of  waterglass  occured  at  5%  ie11.33, while the  largest  permeability  of  waterglass  occurred  at 15%  ie  139.33  and  compressive strength of waterglass occured at 25% ie 16.33.