Experimental Study Lithium Slag And Steel-polypropylene Hybrid Fiber On The Seismic Performance Of Reinforced Concrete Shear Wall

With the dramatic develop of high-rise construction,civil engineering put more requests on the anti-seismic performance of shearing wall which caught up with this construction.Nowdays,this kind of construction were commonly seen among the modern buildings.The hybrid concrete showed perfected mechanical properties and duration because of the advantages deriving from various kinds of fiber.Carried on proper processing,hybrid concrete composted with certain gredients showed significant improvement of anti-seismic property.A great deal lithium salt were explored in Xinjiang,meanwhile,numerous impairment were load on environment because the insufficiency use of waste lithium.However,lithium contained abundant chemical activity which could attribute to saving utility of cement,benefitting environment either.Mechanical properties,early crack resistance and shear behavior of lithium slag of steel fiber and polypropylene fiber were mainly researched in this paper.And the conclusions followed:(1)The effect of lithium slag on the strength and early crack resistance of concrete were systemically studied.The least crack area(per m2)and highest compressive strength(per m3)were measured as 20%wt lithium slag added.On the condition of 20% lithium slag involved,the samples,steel-polypropylene hybrid fiber lithium slag concrete,were tested.And the result showed that mixed fiber had the prior early crack resistance,then single polypropylene fiber.Even single steel fiber specimen was more fragile than the mix fiber ones and single polypropylene fiber ones,but it still much better than the one without fiber.(2)The gredient of concrete was consisted of 1.5%wt steel fiber and 1.2kg/m3 polypropylene.Respectively,a low-cycle cyclic loading test was carried on two different samples.One of the sample was the lithium slag shear wall with 1:1 shear span ratio.Another one is the steel-polypropylene mixed fiber lithium slag concrete wall.The data showed that steel-polypropylene mixed fiber enhanced the consumption of energy,strengthened the stiffness of the wall,improved the loading and limit of displacement.What more,make the hysteresis curve continuous.With the add of mix fiber,the damage behavior of shear wall turn into bending damage rather than shear damage.Beside the damage behavior,the surface of wall kept in a good condition of integration even suffering damage.As the axial compression ratio rise up to 0.2,the bearing capacity was 29.62% higher than the one with 0.1 compression ratio.The stiffness of wall and limit of crack increased dramatically,the energy consumption decrease.Meanwhile,the damage behavior changed from bend damage into shear damage again,the cracker on the wall was obviously increased both in number and density.