Experimental Study On Durability Of Dry-Mixing Self-Compacting Concrete

Not only for its common properties of self-compacting, the most important feature of dry-mixing self-compacting concrete (DSCC) is the commercialized production of its main materials (short for base material). Only we need do is adding some water and coarse aggregate into the base material, then stirring uniformly. The mixing proportion needn't be designed in the construction site. For its simple operation, DSCC is easy to be acceptable by the construction units.The mechanical properties of DSCC has been systematic researched, based on its theoretical foundation, this thesis studied on the durability and pore structure through a series of experiments, then compared with the common concrete of equality strength. There are some conclusions as follow:(1) According to the workability experiments, the mixing proportion which meet to the require standards is that: the water amount is 13%, the coarse aggregate amount are 15%,25%,35% and 45% respectively.(2) In the same curing age, the anti-carbonization ability,the anti-freeze-thaw cycles ability and the anti-sulfate attack ability of DSCC are better than common concrete. The less coarse aggregate, the better of these ability.(3) By chloride ion permeation text, it shows that using more of coarse aggregate (as 35% and 45%) ,the anti-chloride ion permeation ability of DSCC is better than common concrete. If using less coarse aggregate (as 15% and 25%) , and vice versa.(4) The dry shrinkage strain of DSCC is larger than common concrete.(5) In the same curing age, the pore structure of DSCC is superior to common concrete, Which results shows some relativity between the anti-carbonization test,the anti-freeze-thaw cycles test,the anti-sulfate attack test and pore structure.