Study on properties of fiber reinforced seawater sea sand concrete
As a countermeasure to the problem of brittleness of seawater sea sand concrete(SSC),volumetric admixture of glass fiber(GF)and polyvinyl alcohol(PVA)fiber was used as variable,the corresponding specimens were prepared,and the cube com-pressive strength,splitting tensile strength,axial compressive strength,and elastic modulus were tested.The microstructure of fiber reinforced seawater sea sand concrete was analyzed by scanning electron microscope(SEM)scanning and energy dispersive spectros-copy(EDS)dot scanning,and a model was established based on the grey system theory.The research results show that the fiber can effectively reduce the formation of cracks,leading to a ductile failure of the specimen.In general,the mechanical properties of mixed fiber were improved better than that of single fiber,and the hybrid ratio 2∶1 brings a improvement of 24.2%and 38.8%for the compressive strength and splitting tensile strength,respectively.The hybrid ratio of 1∶1 increases the axial compressive strength and elastic modulus by 34.5%and 15.5%.It was observed by SEM and EDS that fiber incorporation could densify the matrix,while the main disadvantage of SSC was that the salt crystallization generated by corrosive ions and swelling substances weakened the bond between aggregate and mortar,resulting in defects of interfacial transition zone(ITZ).The established NSGM(1,3)model has a high accuracy,the accuracy reaches class Ⅱ and conforms to the long-term prediction,which provides a favorable basis for the study of the strength elvolution of fiber reinforced seawater sea sand concrete.
seawater sea sand concreteglass fiberpolyvinyl alcohol fibermicrostructuregrey prediction model
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