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Cob: Counter-attacksToSwink toswink at mindspring.comFri Nov 9 20:00:52 CST 2001
Not sure if I understand thread sorry if wrong. When I took masonry classes we made park benchs which when finsihed were smooth. We took sand/creek pebbles and dropped them on top of cement. Then when it was dry we took what was called a holy stone. As we ran water over surface we rubbed the stone untill the surface was smooth. Same thing should occur on any cement surface. ----- Original Message ----- From: "Frances Grill" <grill at vtc.net> To: <coblist at deatech.com> Sent: Friday, November 09, 2001 5:10 PM Subject: Re: Re:Cob: Counter-attacks > > Greetings, Boy Charmaine, you never cease to amaze me! I'd have to > quit ranching to read as much as you do. This inverted counter-attack > does leave me with a few questions, Troweling has several purposes as > you well know. Obviously it serves to flatten the exposed surface. It > also serves to draw cement and water up through the aggregate so that > all the interior surfaces and spaces get covered with bonding agent > (cement in most cases). Stone or aggregate gets pushed down and cement > comes to the surface to form a sort of monolithic plane.As the concrete > sets, each pass with the finish trowel "burns" the surface to proper > glass like hardness...burnishes the surface just as a rub on clay > plaster would. So with none of this happening on the underside, how does > one get a smooth non-porous surface? Even micro pores are going to store > bacteria no???What am i missing, Besides a copy od Fine Home Building ? > PAZ,Pedro > >
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