Tag: "hanson permanente"

Calera Limestone, a Gift from the Ancient Pacific

Calera Limestone, a Gift from the Ancient Pacific

This humble stone is both economically and scientifically valuable, not just a mainstay of the concrete supply but a signpost in time from a world now lost.

 
Andrew Alden

Post on Apr 14, 2011 by

Cement – A Dirty Business

Cement – A Dirty Business

Thought California has consigned coal-burning to the scrap bin? Think again! California has 11 coal-fired power plants, all used to heat limestone into cement — making us one of the biggest cement-producing states in the country. In addition to cement, these kilns produce 95% of the state's airborne mercury pollution and 2% of its greenhouse [...]

 
Amy Standen

Post on Apr 04, 2008 by