Experimental Study On The Durability Of The High-Performance Concrete Mixed With Slag Powder

With the development of the green high-performance concrete, to conserve the energy and save the raw materials, used the active mineral admixture and super plasticizer to compound high performance, high durability concrete has been a construction issue of the world. The concrete with the dual-mixed technology, this has lower water-cement ratio, better performance, higher strength and durability. This experiment used the slag to preparation the high performance concrete which content the strength,and the durability is better than the concrete of non-doped slag. Better used of the region's ground slag powder by the experimental conclusions of the trial, to achieve its industrial and construction applications, reflect the environmental protection, economy and the path of sustainable development strategies. Specific test contents as follow:First of all, researched the workability of concrete mixed with different specific surface area of slag powder, based on changes in incorporation, the concrete that mixed with the slag whose specific surface area is 620m2/kg, replaced of equivalent cement 50%, the workability was better than the concrete that mixed with other slag powder of different specific surface area, and its indicators of the durability were better than the concrete of non-mixed the slag.Second, researched the concrete mixed with different specific surface area and different content of slag, whose compressive strength,impermeability,frost resistance,anti-carbonation,as well as corrosion resistance changes etc. Come to the conclusion that the concrete mixed with slag volume of cement replaced by 50%～70% of the specific surface area is 810m2/kg whose durability indicators are better than other concrete mixed with slag of different specific surface area.Final, used the laser particle size analyzer to make the analysis of different specific surface area of the slag powder particle size, from the particle size distribution can see the slag powder of greater surface area that its particle size distribution is better, intuitive response to the cement mortar mixed with slag of greater surface area which block's strength is higher; then used the scanning electron microscopy equipment to analyze the micro-material composition of the different proportions of the mortar, cement mortar mixed with slag of greater surface area which generate more C-S-H gelatins and its structure is denser, the strength higher, the durability better.