The Experimental Research Of Concrete Strength On The Basis Of Water-reducing Effect Of Fly Ash

Fly ash used in concrete with other materials are second to none quality of the advantages, but due to the type and the nature of coals, fly ash itself has the characteristics of heterogeneity. Water Reduction of fly ash is an important indicator to determine the quality of fly ash,but in the present norms "Fly ash used for cement and concrete"(GB/T 1596-2005), the water demand of fly ash whether reduction ratio is to investigate the water and reduce water good or bad such as reduction important indicator of water features, but the specification given out of the water requirement of fly ash content under in a specific index(fly ash replacement rate of 30%), can not be completely presented characteristics of fly ash, which also makes the work of fly ash on mortar and concrete performance of evaluation has become more general and vague. This paper studies the water reduction properties of gradeâ… and gradeâ…¡fly ash investigated the quality characteristics of fly ash .During the fly ash concrete mix design, necessary to reduce water characteristics of fly ash as an important indicator to be considered.This paper selects four different areas in Gansu coal-fired power plant production of four different quality of fly ash, measured index the physical and chemical indicators, analyzed morphological effects of fly ash, volcanic ash effect and micro-aggregate effect, through the mortar test of fly ash volume measured in different rates and under water reduction the intensity of in different ages, compared to identify the impact of compressive strength of fly ash by water features and changes of the main factors, and micro of fly ash Shape analysis.Obtained in the analysis of water-reducing properties of fly ash on the basis, we conduct a trial of fly ash concrete mix design and testing of distribution to increase the compressive strength of concrete targets for assessing levels, compared to replace the law and the equal excess replace the concrete compressive strength under the law of change. Secondly, the design method of orthogonal analysis of fly ash concrete strength of the main factors, using mathematical regression analysis to analyze intensity and related factors (water-cement ratio, fly ash, water reducing rate and sand ratio) between the linear relationship, the regression equation, and the regression equation to optimize the checking, the optimal regression equation, along with a brief analysis of the incorporation of fly ash in concrete economic and social benefits.