drywallrecycling.com
域名年龄: 22年26天HTTP/1.1 301 永久重定向 服务器:nginx/1.10.2 访问时间:2016年11月13日 16:26:14 类型:text/html; charset=iso-8859-1 文件大小:326 连接:keep-alive 目标网址:http://www.cdrecycling.org/drywall-recycling 缓存控制:max-age=1 过期时间:2016年11月13日 16:26:15 HTTP/1.1 200 OK 服务器:nginx/1.9.15 访问时间:2016年11月13日 16:26:14 类型:text/html; charset=utf-8 文件大小:8272 连接:keep-alive Keep-Alive: timeout=20 X-Mod-Pagespeed: 1.9.32.14-0 动作:Accept-Encoding 缓存控制:max-age=0, 不缓存, post-check=0, pre-check=0 Content-Encoding: gzip 隐私:CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM" 其他指令:不缓存 设置Cookie:serviceID=5120; expires=Sun, 13-Nov-2016 09:26:15 GMT; path=/; httponly 设置Cookie:serviceID=5120; expires=Sun, 13-Nov-2016 09:26:15 GMT; path=/; httponly 设置Cookie:0012f0e1bd8c627a4a486a1336b31aa5=n6fur12slhsq4vkdt8qlddvbr2; path=/; HttpOnly 设置Cookie:Login=1; httponly X-Frame-Options: SAMEORIGIN 网站编码:utf-8
Search WelcomeThe Mission of the CDRAStaff & Board of DirectorsOur Sponsor MembersContact UsThe Impact of the CDRACDRA AccomplishmentsNews & EventsCDRA NewsQ & A on C&D World Show RFPQ & A on C&D Recycling Impact RFPRecycling News FeedsNewslettersCDRA AwardsCDRA EventsCDRA Member NewsEngineering News-RecordFind a C&D RecyclerWebsites & LinksState Regulatory ProfilesCDRA Member-Only ContentRecycling CertificationShingleRecycling.orgConcrete RecyclingThe Waste StreamWhy Recycle?End MarketsThe BarriersThe EconomicsThe EngineeringHow to RecycleConcrete Recycling PlantsCase HistoriesFAQsLinksDrywall RecyclingMarketsNew DrywallPortland CementLand ApplicationCompostProcessingOn-Site RecyclingEnvironmental & Permitting IssuesState ContactsPossible Environmental ConcernsResourcesTechnical ReportsPublished StudiesState ExperienceFact SheetsLinksAsphalt Pavement RecyclingMembershipJoin the CDRA/Renew Your MembershipSponsorshipPoliciesInsurance Login Member Search Search Upcoming Events 2017 C&D World Exhibition & Conference Our Sponsors Websites & Links | Drywall Recycling Drywall Recycling To give you a basic overview of gypsum drywall recycling, we’ve compiled answers to commonly-asked questions about the process. What is Gypsum Drywall? A description of gypsum drywall must first begin with a discussion of gypsum itself. Gypsum, a naturally occuring mineral, is composed of calcium sulfate (CaSO4) and water (H2O). Also referred to as hydrous calcium sulfate (CaSO4.2H2O), gypsum is mined from deposits formed by ancient seabeds as a raw material for many different manufacturing, industrial, and agricultural uses. Over 80% of the gypsum mined is used in manufactured products such as drywall. Gypsum possesses many attributes that make it an attractive construction material. Calcined gypsum can be wetted to form a paste that can be directly applied to a structure’s surface or that can be molded into a desired shape; the gypsum hardens upon drying. Gypsum is naturally fire resistant. Gypsum drywall, often referred to as gypsum wallboard or sheet rock, replaced gypsum plaster as the major material used for interior wall surfaces because of its ease of installation. Gypsum drywall consists of approximately 90% gypsum and 10% paper facing and backing. Drywall is manufactured by first calcining the gypsum, a process that heats the mineral to remove part of the water (resulting in CaSO4.1/2H2O). The stucco that is formed is then rehydrated by mixing with water, and the slurry created is spread onto a moving continuous sheet of paper and sandwiched between another layer of paper. This continuous sheet of wallboard is allowed to harden for several minutes, cut into panels and sent to a kiln for final drying. It is trimmed to the dimensions required, bundled, and is then ready for shipment. Drywall comes in many different types and sizes to meet specific construction needs. For more information on gypsum and g
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