Study on the Winter Construction Quality Testing and Experimental Research of Mixed Composite Antifreeze Ordinary Concrete
|School||Lanzhou University of Technology|
|Keywords||Composite Antifreeze Precured Time Winter Construction Durability Freeze-thaw Cycle Equivalent Age|
With the development of social economy, modern concrete construction program shouldhave higher construction speed, good performance, long use life-span and wide applicationscope. Focus on mixing commercial concrete has become a trend in cities and towns, andadmixtures mixed in the commercial concrete are mainly composite additives. At present,China establishes the evaluation system of research for only doped single antifreeze, but notheory for the assessment of the doped compound antifreeze. In this paper, combing with theresults of theoretical studies, by a large number of test analysis, with reference to the“Concrete Antifreeze”(JC475-2004), detect the antifreeze performance of compositeantifreeze by determining the “pre-raise time”.Combined with the relocation of the transformation project of3million tons ofQingyang Petrochemical Company, making a comparative evaluation laboratory intensitycurve, the field intensity curve with the selected intensity curve of mixed with antifreezeconcrete in standard “construction projects of winter construction procedures”(JGJ104-97),given an assessment of doped composite antifreeze concrete construction in winter to meetthe construction needs. Combination of “concrete structural durability design specifications”(GB/T50476-2008), do a comprehensive analysis of the concrete compressive strength lossrate, mass loss rate. Determine doped composite antifreeze concrete to satisfy the durabilityrequirements, can achieve the life expectancy of the concrete strength and meet theconstruction requirements in winter.Making a strength prediction of negative temperature concrete by using regressioncurves, drawing on the existing concrete strength prediction equation at room temperatureand prediction methods of low temperature concrete, predict and analyze concrete strength inwinter. Thus, provide a reference for the next step in the construction process and make itmore suitable for theoretical research and engineering applications.