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geopolymer concrete

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  • sanu abraham
    Haiii...frnds...anybody have idea  abt geopolymer concrete,pls forward to group....any site applications? regards santo.... Unlimited freedom, unlimited
    Message 1 of 7 , Sep 22, 2008
      Haiii...frnds...anybody have idea  abt geopolymer concrete,pls forward to group....any site applications?
      regards
      santo....


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    • sanu abraham
      haiii...anybody having idea about Geopolymer concrete?..plz forwadr to me..... Cricket on your mind? Visit the ultimate cricket website. Enter
      Message 2 of 7 , Feb 25, 2009
        haiii...anybody having idea about Geopolymer concrete?..plz forwadr to me.....


        Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com
      • S. Boopathyraja
        Building construction places a huge burden on the environment. The materials used for construction incorporate large quantities of natural resources, which is
        Message 3 of 7 , Feb 25, 2009

          Building construction places a huge burden on the environment.  The materials used for construction incorporate large quantities of natural resources, which is not in tune with the current need of sustainability.  Judicious use of resources, as well as utilization of waste and byproducts, along with energy efficient methods is necessary to ensure sustainable construction.  Recent development in Geopolymer concrete proves that it is an important fact of Green buildings. 

                      Geopolymer concretes fall under the more general category of Alkali activated concretes.  A geopolymer is an inorganic alumino silicate polymer synthesized at temperatures lower than 1500C.  The polymerization occurs in the presence of an alkaline activator, such as sodium silicate, in an alkaline medium provided by NaOH or KOH.  Geopolymerisation involves a 2 step process, where the aluminosilicates are first dissolved by the alkali hydroxides, and properly oriented for polymerization.  Polycondensation then happens in the presence of the alkaline activator, leading to the formation of a 3-D cross linked structure.   

                      In order to make a workable concrete mixture, a proper choice of the water content in the mixture should be made.  The activators are typically used in a solution form, and only marginal extra water needs to be added to obtain a workable mixture.  Fresh geopolymer concrete can be tested like any ordinary concrete for its workability.  However, setting at room temperature is not easy to guage, as the process would be affected by the reactivity of the aluminosilicate source material.  In order to be effective, the process of polymerization requires moderate heating up to 1500C.  Unlike Portland cement concrete, geopolymer concrete does not require prolonged periods of curing to attain its potential strength.  Research has shown that 24 – 48 hours at temperatures of 60 - 900 C are sufficient for the attainment of the potential compressive strength of geopolymer concretre.  The source of the aluminosilicate can be clay, flyash, slag, metakaolin etc.  Of these, it would be most beneficial to use flyash, because of its large availability and limited utilization. 

                      The long term behavior and durability of low calcium flyash based geopolymer concretes are a current topic of investigation.  Because of the nature of processing involved in preparation of geopolymer concrete, primarily the need for high temperature curing, this material would be a better choice for precast concrete than for in-situ concreting.  However, with the increasing demand for precast concrete products, there is excellent potential for use of geopolymer concrete.  Especially in the light of the environmental concerns with the use of conventional concrete, geopolymer seems to have a promising future.

           

          From: engineeringcivil@yahoogroups.com [mailto:engineeringcivil@yahoogroups.com] On Behalf Of sanu abraham
          Sent: Thursday, February 26, 2009 8:32 AM
          To: engineering civil
          Subject: [engineeringcivil] geopolymer concrete

           


          haiii...anybody having idea about Geopolymer concrete?..plz forwadr to me.....

          Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com



          "This Message and its contents is intended solely for the addressee and is proprietary.Information in this mail is for L&T Business Usage only. Any Use to other than the addressee is misuse and infringement to Proprietorship of L&T ECC.If you are not the addressee please return the mail to the sender.L&T ECC DIVISION"
        • sanu abraham
          ... From: S. Boopathyraja thank u for ur response Subject: RE: [engineeringcivil] geopolymer concrete To: engineeringcivil@yahoogroups.com
          Message 4 of 7 , Feb 26, 2009


            --- On Thu, 26/2/09, S. Boopathyraja <sboopa@...> wrote:
            From: S. Boopathyraja thank u for ur response<sboopa@...>
            Subject: RE: [engineeringcivil] geopolymer concrete
            To: "engineeringcivil@yahoogroups.com" <engineeringcivil@yahoogroups.com>
            Date: Thursday, 26 February, 2009, 9:15 AM

            Building construction places a huge burden on the environment.  The materials used for construction incorporate large quantities of natural resources, which is not in tune with the current need of sustainability.  Judicious use of resources, as well as utilization of waste and byproducts, along with energy efficient methods is necessary to ensure sustainable construction.  Recent development in Geopolymer concrete proves that it is an important fact of Green buildings. 

                        Geopolymer concretes fall under the more general category of Alkali activated concretes.  A geopolymer is an inorganic alumino silicate polymer synthesized at temperatures lower than 1500C.  The polymerization occurs in the presence of an alkaline activator, such as sodium silicate, in an alkaline medium provided by NaOH or KOH.  Geopolymerisation involves a 2 step process, where the aluminosilicates are first dissolved by the alkali hydroxides, and properly oriented for polymerization.  Polycondensation then happens in the presence of the alkaline activator, leading to the formation of a 3-D cross linked structure.   

                        In order to make a workable concrete mixture, a proper choice of the water content in the mixture should be made.  The activators are typically used in a solution form, and only marginal extra water needs to be added to obtain a workable mixture.  Fresh geopolymer concrete can be tested like any ordinary concrete for its workability.  However, setting at room temperature is not easy to guage, as the process would be affected by the reactivity of the aluminosilicate source material.  In order to be effective, the process of polymerization requires moderate heating up to 1500C.  Unlike Portland cement concrete, geopolymer concrete does not require prolonged periods of curing to attain its potential strength.  Research has shown that 24 – 48 hours at temperatures of 60 - 900 C are sufficient for the attainment of the potential compressive strength of geopolymer concretre.  The source of the aluminosilicate can be clay, flyash, slag, metakaolin etc.  Of these, it would be most beneficial to use flyash, because of its large availability and limited utilization. 

                        The long term behavior and durability of low calcium flyash based geopolymer concretes are a current topic of investigation.  Because of the nature of processing involved in preparation of geopolymer concrete, primarily the need for high temperature curing, this material would be a better choice for precast concrete than for in-situ concreting.  However, with the increasing demand for precast concrete products, there is excellent potential for use of geopolymer concrete.  Especially in the light of the environmental concerns with the use of conventional concrete, geopolymer seems to have a promising future.

             

            From: engineeringcivil@ yahoogroups. com [mailto:engineering civil@yahoogroup s.com] On Behalf Of sanu abraham
            Sent: Thursday, February 26, 2009 8:32 AM
            To: engineering civil
            Subject: [engineeringcivil] geopolymer concrete

             


            haiii...anybody having idea about Geopolymer concrete?..plz forwadr to me.....

            Cricket on your mind? Visit the ultimate cricket website. Enter http://beta. cricket.yahoo. com



            "This Message and its contents is intended solely for the addressee and is proprietary. Information in this mail is for L&T Business Usage only. Any Use to other than the addressee is misuse and infringement to Proprietorship of L&T ECC.If you are not the addressee please return the mail to the sender.L&T ECC DIVISION"


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          • pravin sharma
            Can i anyone tell the current cost index on CPWD Cost Index 1.10.2007 (PAR) - 100% In 1/04/2008 it was - 119% In 1/10/2008 ........................?   Thanks
            Message 5 of 7 , Feb 26, 2009
              Can i anyone tell the current cost index on CPWD Cost Index 1.10.2007 (PAR) - 100%
              In 1/04/2008 it was - 119%
              In 1/10/2008 .......................?

               
              Thanks and Regards,
              Pravin Sharma
              www.pravinsharma.com
              Mobile: +91-9818190209
               
               
               
               
               
               


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            • shahrukh48
              Hello Everyone Can anyone share information about Concrete Staining specially home made recipes. Any links?? Regards SR Lodhi
              Message 6 of 7 , Feb 26, 2009
                Hello Everyone

                Can anyone share information about Concrete Staining specially
                home made recipes. Any links??

                Regards SR Lodhi
              • pandu rangarao
                Dear all, Can anyone please send me data  related geopolymer concrete.   with regards,   Pandu rangarao Adapa 9004102223 Dear all, Can anyone please send
                Message 7 of 7 , Aug 1, 2012
                  Dear all,
                   
                  Can anyone please send me data  related geopolymer concrete.
                   
                   
                   
                  with regards,
                   
                  Pandu rangarao Adapa
                  9004102223
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