Experimental Research On Durable Performance Of Geopolymer Concrete

Geopolymer has attracted more and more attention in Constuction Engineering and Envirnment Engineering recently. As a result, it becames the hot spot in the research of engineering. Based on the Geopolymer Concret which has inadeGuate research, this paper sumarize the forming mechanism of Geopolymer. By using fly ash, fine ore and alkali activator to prepare the Geopolymer Concret, for the first time it analyzes the basic durability (including c the feezing resistance of speciman, the drying shrinkage of speciman,the humid of speciman,the chlorion diffusion of speciman,the sulfate corrosion of speciman and the accelerated carbonation of speciman) of Geopolymer Concret and High Geopolymer Concret, and also make a comparison between the Common Conret and the Highe Concret and the same compressive strength. This paper gives a breif explanation for the fracture characteristic and mechanism of specimen and gets the following results:By testing the the sulfate corrosion of specimen. It gets that the average permeability of HGC is much bigger than GC, which means that HGC has inferior impermeability.By testing the feezing resistance of speciman, the relative elastic modulus and mass loss have been get when testing the Geopolymer and Concret and Common Concret ant the same experimental condition. By comparision these two concret at the same compressive strength, it gets that along with the increase of circle of freezing and thawing, the relative elastic modulus change a very little. In the early stage, H and GH all have downward trendency and they all change a little when the circle of freezing and thawing is 100. They are 88% and 95.8%. But after the circle of freezing and thawing is 40, HGC is creasing. When the circle of freezing and thawing is 125, the relative elastic modulus is 67.1% and the relative elastic modulus of Geopolymer Concret HC reduce soon. It goes to 60% after 100. After the circle of freezing and thawing is 100, HC mess loss is 9.1% while C has no mess loss. After the circle of 125, HGC only loss 0.13%. HGC has very little loss on mess, so it totally meets the freezing-resistance reGuirements of road concret in cold areas.By testing the drying shrinkage of speciman, it analyses the geopolymer conrect dry shrinkage characteristics along with the changing of dry shrinkage. Age of 3-7days, two groups specimans increased apparently on drying shrinkage. Age of 7-14days, both value explose. After the age of 60, the value increased very slowly. The drying shrinkage of HC and C are almost the same. So it is oblivious that geopolymer has very small effect to C's drying shrinkage.By testing the chlorion diffusion of speciman and judging the permeability of chlorion by the charge loading of speciman, it gets that charge laoding of C geoploymer compare is 39.6% lower than common concret, which means that HC has very good permeability and HGC has inferior permeability.By testing the sulfate corrosion of speciman and analysing its anticorrosion coefficient when soaking and corrosion by sulfate.It gets that the anticorrosion coeffecient of C and HGC are all above 0.8, which means that both of them have good anticorrosion coeffecient performance.By testing the Accelerated Carbonation of speciman and analysing its anticorrosion coeffecient on dry-wet condition. It gets that the average permeability of HGC is much bigger than GC, which means that HGC has inferior impermeability.