The Influence Of Fly Ash And Limestone Powder On Concrete Slurry Flow Properties

China’s construction industry is developing rapidly in recent years, use of mineral admixture of concrete has also to environmental protection, economic trends. Many scholars have studied on the fly ash used as admixture of concrete, and made lots of achievements, fly ash is a kind of high-quality mineral admixtures, its many advantages were proved, the improvement of the rheological properties of concrete has been most scholars; and limestone powder as an inert admixture adding research in concrete was gradually increased in recent years, limestone is rich in resources, using it can not only Protect environment, also can produce good economic and social benefits; the two kind of admixture admixture in concrete alone, there have been many studies, but few study on mixed with limestone powder and fly ash. In this paper, limestone powder, fly ash as the research object, research the influence on the rheological property of cement paste, and discusses their performance on cement paste, mortar and concrete improvement.Firstly, design of cement paste test fly ash and limestone powder and mixed, fixed the two blending blending materials, through mini slump test and marsh tube experiment, studied in the different conditions of these two kinds of admixture ratio on fluidity of cement paste, influence particle size of cement paste material pairing fluidity of cement paste were analyzed by single point test, and to evaluate the performance of the cement slurry flow according to the yield of cement slurry Bingham fluid model. The stress and the viscosity coefficient of performance.Secondly, to influence the design of fly ash and limestone powder and mix on the fluidity of cement mortar and mortar fluidity loss, mixed experimental design ideas for the content of fixed limestone, gradually increase the amount of fly ash. Experiments show that with the increase of lime cement mortar system consistency, the "filling effect" can increase the cement mortar in a certain degree of fluidity, greatly reduce the cement mortar fluidity loss. The fly ash in the different proportion of mobile mixing cement mortar degree has different effects.Concrete water cement ratio, mineral admixture content and the proportion of cement mortar test the same, so you can better judge the concrete slump flow and fluidity of cement mortar correlation, but also can provide a basis for the fluidity of cement mortar to predict the flow performance of concrete; by scanning electron microscopy to observe the failure of concrete the interface of the fly ash and lime stone powder particle morphology, status, provide the basis for improving the analysis of two flow performance concrete slurry theory.