Muskateer Posted July 7, 2009 Report Share Posted July 7, 2009 Does anyone know whether adding quartz or marble to basic plaster makes it stronger? Quote Link to comment Share on other sites More sharing options...
quantumchromodynamics Posted July 8, 2009 Report Share Posted July 8, 2009 Plaster is a mixture of white cement and an aggregate, such as marble or quartz. Quote Link to comment Share on other sites More sharing options...
billp Posted August 10, 2009 Report Share Posted August 10, 2009 Plaster is a mixture of white cement and an aggregate, such as marble or quartz. Marble is the traditional aggregate in plaster. It is very soft. Quartz is very hard. Only problem is you can't get snow white with quartz, who needs it so get a color. Quote Link to comment Share on other sites More sharing options...
quantumchromodynamics Posted August 11, 2009 Report Share Posted August 11, 2009 Plasterers are beginning to use quartz and silica sand in plaster because they are much more durable than marble. They also act as "pozzolons". The purpose of a pozzolan is to convert calcium hydroxide into calcium silicate hydrate as seen here Ca(OH)2 + H4SiO4 —> Ca2+ + H2SiO42- + 2 H2O —> CaH2SiO4 • 2 H2O Calcium silicate hydrate is much less susceptible to aggressive water than calcium hydroxide. However, the calcium silicate hydrate is usually going to be some shade of grey and not pure white. Quote Link to comment Share on other sites More sharing options...
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