Research On The Shrinkage Ability Of High Performance Concrete Added Fly Ash

The high performance concrete have the goods working capability,excellent durability,economy rationality and environmental protection,which is widely used in various of structure. But in practice, because the high performance concrete has characteristic of low water glue ratio, high sand ratio and large cement content and so on, all these characteristic make the high performance concrete crack at early stage.it is becoming more and more significant to further the studies on the shrinkage of HPC. Fly ash and the other mineral admixture have the good effect,under the reasonable usage situation,they could restrain the high performance concrete from shrinking.So in this article, the author investigates the changing rules of drying shrinkage property and mechanical property of the high performance concrete with the different mineral admixture and admixture dosage.Firstly,through the orthogonal combination experiment, I get the best concrete mix ratio of C30 high performance concrete solely added fly ash.Secondly,by doing the mechanics experiment on mix calcium enriched liquid slag and fly ash,mix zeolite powder and fly ash,mix increase calcium fly ash and fly ash high performance concrete,I obtain the influence rules of the variety and the content of the admixture on the compressive strength of the high performance concrete .Thirdly,by doing the dry shrinkage test on mix calcium enriched liquid slag and fly ash,mix zeolite powder and fly ash,mix increase calcium fly ash and fly ash high performance concrete,I obtain the influence rules of the variety and the content of the admixture on the dying shrinkage of the high performance concrete and establish shrinkage model.Finally,through the experiment of environmental scanning electron microscope and X-ray diffraction, I get the microscopic view pattern picture and X-ray pattern of the high performance concrete with the different mineral admixture and then analyze the microscopic view pattern picture,movement of the monohydrate crystal in the X-ray pattern and the relationship between the intensity and shrinkage of the high performance concrete.