The Experimental Research Of Corrosion Resistance Of Compound Admixture Steel Fiber And Super-absorbent Polymers On High Performance Concrete

This paper aimed at the service and the durability of concrete affected by anti-abrasion and sulfate corrosion which is potential and has sparked in inner surface and outer surface of hydraulic concrete building. The incorporation of fly ash,super absorbent polymer (SAP) and steel fiber in concrete is put forward to modify the performance of concrete, which plays the role of concrete natural curing at the same time improves the durability of concrete. Through the contrast test, the effects of the steel fiber and super-absorbent polymers on the mechanical properties, impact abrasion resistance, permeability resistance and sulfate attack resistance of high performance concrete is studied and its influence mechanism is discussed in this paper. Meanwhile as to provide theoretical basis for solving the problems of hydraulic concrete anti-abrasion and sulfate corrosion in salt lake area.Main research results are listed as follows:(1) Through the orthogonal experiment, the optimal mixture ratio of steel fiber and SAP concrete is concluded like this:water/cement ratio is0.36, the dosage of fly ash is20%, the sand ratio is38%, the dosage of SAP is0.4%, steel fiber volume rate is1.0%in the steel fiber reinforced high-performance concrete.(2) It’s beneficial for the super absorbent polymer on the mechanical properties and durability of concrete on dry conditions.(3) The iMPact abrasion test shows that the concrete with compound mixing fly ash, SAP and steel fiber can decreases strength fell by8%in the standard condition, by contrast, the strength of compound mixed concrete is increased by25.78%in dry conditions.(4) The permeability test showed that relative permeability coefficient of the concrete with compound mixing fly ash, SAP and steel fiber is reduced both in the standard conditions and in dry condition, and the decreasing amplitude reached by82.1%and91.7%respectively, which shows that the fly ash, SAP and steel fiber compound mixing can significantly improve the permeability resistance of concrete.(5) The erosion resistance tests showed that the concrete with compound mixing fly ash, SAP and steel fiber can significantly improve the ability of the resistance to sulfate attack. Corrosion scale raising conditions, in90days the concrete with compound mixing fly ash, SAP and steel fiber can compressive strength the corrosion resistance coefficient than the baseline group increased by3.2%, tensile splitting strength resistance coefficient than the baseline group increased by12.1%. In dry conditions by mixing fly ash, SAP and steel fiber can compressive strength of concrete corrosion resistance coefficient than the baseline group increased by7.9%, the tensile splitting strength resistance coefficient than the baseline group increased by9.6%.