Study On Durability Test And Mechanical Properties Of Mixing Slag Powder Of High Performance Concrete

Concrete is the most widely used in civil engineering, the biggest building materials dosage, but on the strength and durability of concrete and water-saving environmental protection request more and more high. In this paper, the concrete durability test with raw materials and the mixture ratio design, and probes into the design of concrete durability test, mechanical property test, and the analysis of microstructure observation. Found in this paper with mixed grinding fine slag powder preparation except meet the strength of concrete, the durability indicators are better than that of without mixing slag powder concrete.First mixed with slag powder can make a great mobility, water retention and good adhesiveness, concrete mixing is obtained through the experiments of specific surface area of 620 square meters/kg of slag powder content 50% concrete workability, strength and durability of the index is higher, but when slag powder, specific surface area increased to more than 710 square meters/kg, and the increase of the content, unit water consumption increases, the workability. C100 high strength high performance concrete are show superior durability, three doped silicon powder, fly ash and mineral powder mixture ratio, its impermeability, resistance to chloride ion erosion and frost resistance durability is better than that of double doped silicon powder and fly ash mixture ratio. Consider the factor of dry shrinkage, according to the fuzzy multiple attribute decision making theory, the concrete mixture ratio is calculated by using the coefficient of variation of relative degree it can be seen that the durability of concrete mixture ratio the pros and cons of this order: C1515 > C1010 > C2000 > C1020 > C002.Second experimental study on the modern high-performance concrete carbonization behavior and microscopic mechanism, test and analysis the carbonization reaction of high performance concrete pore structure and the influence law of gel component. The r esults show that the carbonation reaction changed the crystal morphology, crystal of hydration products reduces internal open pore connectivity, high performance concrete and reduce its total porosity, thus improve the compactness of concrete structure. Inside the concrete Ca(OH) 2 content and pore structure is characterized by two main factors influencing the performances of concrete carbonation resistance.