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the_international_code_council_shall_adopt_stringent_performance-based_building_codes [2019/06/21 02:11]
99.238.240.127
the_international_code_council_shall_adopt_stringent_performance-based_building_codes [2019/06/21 02:13] (current)
99.238.240.127
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 To make concrete, the Portland cement is mixed with water to form a paste, which is then combined with aggregate. This mushy substance is placed into forms, where it dries and hardens into a rock.  To make concrete, the Portland cement is mixed with water to form a paste, which is then combined with aggregate. This mushy substance is placed into forms, where it dries and hardens into a rock. 
  
-Most concrete nowadays also contains fly ash, a fine powder that is a by-product of burning pulverized coal in [[https://​www.thebalancesmb.com/​world-greatest-power-generator-systems-4061821|electric generation power plants]]. When combined with lime, fly ash can be used as a substitute for some of the Portland cement, and in fact improves the quality of the final concrete It is generally stronger than the type made only with Portland cement and, like the Romans’ volcanic ash, it reduces crack problems. Its main advantage is that, by replacing some of the Portland cement, the fly ash reduces CO<​sub>​2</​sub>​ emissions.((Juan Rodriguez, [[https://​www.thebalancesmb.com/​fly-ash-applications-844761|“Uses,​ Benefits, and Drawbacks of Fly Ash in Construction”]],​ //The Balance Small Business//, Feb. 17, 2019.)) ​+Most concrete nowadays also contains fly ash, a fine powder that is a by-product of burning pulverized coal in [[https://​www.thebalancesmb.com/​world-greatest-power-generator-systems-4061821|electric generation power plants]]. When combined with lime, fly ash can be used as a substitute for some of the Portland cement, and in fact improves the quality of the final concreteIt is generally stronger than the type made only with Portland cement and, like the Romans’ volcanic ash, it reduces crack problems. Its main advantage is that, by replacing some of the Portland cement, the fly ash reduces CO<​sub>​2</​sub>​ emissions.((Juan Rodriguez, [[https://​www.thebalancesmb.com/​fly-ash-applications-844761|“Uses,​ Benefits, and Drawbacks of Fly Ash in Construction”]],​ //The Balance Small Business//, Feb. 17, 2019.)) ​
  
 Unfortunately,​ this is not a huge improvement,​ since the fly ash itself is a by-product of coal-fired power plants—which are themselves probably the worst sources of CO<​sub>​2</​sub>,​ and top priority for environmentalists to close down. Moreover, because it is produced by burning coal, about 15 tons of carbon dioxide is emitted for each ton of fly ash produced. That means that the use of fly ash in concrete can offset only five percent of those emissions.((Paul Hawken, ed. //Drawdown: The Most Comprehensive Plan Ever Proposed to Reverse Global Warming//, New York: Penguin, 2017, pp 162-63. See also http://​a.co/​dZCBPIM)) That is better than nothing, so long as coal is being used anyway, but the goal must be to replace quickly both coal use and Portland cement with the better materials. Unfortunately,​ this is not a huge improvement,​ since the fly ash itself is a by-product of coal-fired power plants—which are themselves probably the worst sources of CO<​sub>​2</​sub>,​ and top priority for environmentalists to close down. Moreover, because it is produced by burning coal, about 15 tons of carbon dioxide is emitted for each ton of fly ash produced. That means that the use of fly ash in concrete can offset only five percent of those emissions.((Paul Hawken, ed. //Drawdown: The Most Comprehensive Plan Ever Proposed to Reverse Global Warming//, New York: Penguin, 2017, pp 162-63. See also http://​a.co/​dZCBPIM)) That is better than nothing, so long as coal is being used anyway, but the goal must be to replace quickly both coal use and Portland cement with the better materials.
the_international_code_council_shall_adopt_stringent_performance-based_building_codes.txt · Last modified: 2019/06/21 02:13 by 99.238.240.127