First Study On Experimental Method Of Concrete Resistance To Sulfate Attack Based On Electro-osmotic Pulse

Cement concrete is the largest amount of building materials, mainly used in themain body and the frame structure of the civil construction.Concrete durability is animportant cause of the concrete material damage, sulfate attack is an important factor inthe durability of concrete.Concrete sulfate resistance testing methods have wet and drycycle method, the small size specimen method, increased erosion of the concentrationmethod, increased erosion and solution temperature, but the variety of methods haveshortcomings. Therefore, it is necessary to explore a reasonable sulfate resistance testmethods.In this paper using the electro-osmotic pulse principle, designing a new test methodto accelerate the erosion of sulfate to the concrete in the electro-osmotic pulse. Studyingof sulfate resistance testing method by electroosmosis pulse concrete preliminary. Fordifferent water-binder ratio, different pulse frequency, different ages, differentimmersion environment and different fly ash content of these variables the law of thequality and compressive strength of the concrete resistance to sulfate attack in theelectro-osmotic pulse.Results show that:1) Under the conventional erosion and water by Sulfate Attack of theelectro-osmotic pulse, the mass of concrete specimens are both increase.The mass lossis obviously under the age of28days.And loss of concrete specimens under theelectro-osmotic pulse erosion is larger than conventional erosion and water soaking.2) Under the water-cement ratio for0.3,0.4,0.5by Sulfate Attack of theelectro-osmotic pulse, the concrete’s compressive strength under the sulfate attack isbigger than conventional erosion and water immersion. And the compressive strengthincreasing by the water glueratio increases. Pulse frequency against sulfate attack hadlittle effect at the age of14days and28days.3) Test at28days, in the role of sulfate attack by the electro-osmotic pulse ofconcrete’s compressive strength lower rates is larger than conventional erosion andwater soaked. The28days’effect is more effective and stable than14days’.4) Full-immersion test and immersion testing,in the role of sulfate attack by theelectro-osmotic pulse of concrete’s compressive strength lower than conventionalerosion and water soaked.And semi-immersion test’s compressive strength is lower than full soak.5) Fly ash for20%,in the role of sulfate attack by the electro-osmotic pulse ofconcrete’s compressive strength is larger than conventional erosion and water soakedwhen testing in14days.In the role of sulfate attack by the electro-osmotic pulse ofconcrete’s compressive strength is lower than conventional erosion, but larger thanwater soaked when testing in28days.6) Fly ash for0%20%40%,in the role of sulfate attack by the electro-osmoticpulse of concrete’s compressive strength is lower than conventional erosion and watersoaked, and the compressive strength lower rates is increasing by the increase of fly ash.And the concrete’s compressive strength is lower with the increase of fly ash. Thecompressive strength of the semi-immersion is lower than the full soak one.7) Study has shown that electro-osmotic pulse technology for sulfate resistance of concrete testis feasible.