Research On The Performance And Application Of Ultra-fine Grouting Cement

The capacity tonnage of automobile and traffic grow as a result of developing in country economic, so the failure of pavement structure become more and more serious. Plain concrete has high brittleness, bad lasting quality and long curing period, which restrict its use in road maintaining. So it is very important and imminency to empolder useful repair materials and technology.Through widely investigation on cement concrete pavement in Guangdong province, based on the existing research achievements, cracks status of cement concrete pavement are analyzed and researched . Grouting mechanism, technology, material development and its application to crack disposal in cement concrete pavement is analyzed. UFGC (ultra-fine grouting cement) is made up of UFC (ultra-fine cement) , FA(fly ash) , SF (silica fume) and definite additional . The best proportion of various materials is gained, based on certain experimentation such as material size, rheology, penetrability, intension, endurance and shrinkage of UFGC. The research harvest is applying in engineering in case. The main research contents and result is as follows:1. The relation between ultra-fine cement size and powdering time. UFC(ultra-fine cement), which reach the international standard, is manufactured by normal powdering technology, and its diversified performance all achieve industry standard.2. The adaptability between UFGC and superplasticizer admixture is analysed by the numbers. The liquidity of UFGC is related to breed of superplasticizer admixture and it differs from different superplasticizer admixture.JBS-1 superplasticizer admixture is good to UFGC's liquidity from experimentation .3. UFGC's liquidity is related to the effect of composite of several additional and the accession method of additional. UFGC's liquidity is huge increased with the effect of JBS-1 superplasticizer admixture and multiplex natrium. The accession method of additional can affect UFGC's liquidity, and asynchronous-accession is prior to synchro-accession.4. UFGC's liquidity and penetrability is related to the content of FA, it gets well as the increasing of content of FA .5. Through experimentation of UFGC's mechanics performance, felting strength, shrinkage and expanding performance, durability, it concludes that the best content of FA is 30%, and the best content of SF is 10% .6. Through experimentation of fact engineering in case, the application of technology for dealing with cracks of cement concrete pavement with UFGC is viable. And its application has prodigious foreground.