Preparation and performance study of polypropylene fiber modified porous ecological concrete
Polypropylene fiber was used as the reinforcing phase to prepare polypropylene fiber modified porous ecological concrete.The effect of fiber doping on the microstructure,mechanical properties,and frost resistance of the concrete was studied.The results showed that the appropriate amount of polypropylene fibers were tight-ly wrapped in the concrete matrix after being doped into the porous ecological concrete,forming a stable fiber network structure inside the concrete,which improved the bond strength between the coarse aggregates of the concrete,enhanced the resistance to deformation,and reduced the phenomenon of cracks and aggregate detach-ment.When the doping amount of polypropylene fiber was 0.9 vol％,the compressive strength,flexural strength,peak stress and deflection of concrete all reached their maximum values,which were 29.95,5.04,28.00 MPa,and 6.8 mm,respectively.The residual bearing capacity of concrete decreased in the order of PP-0.9％＞PP-0.6％＞PP-0.3％＞PP-1.2％.After 150 rapid freeze-thaw tests,with the increase in the amount of polypropylene fiber doping,the concrete quality loss first decreased and then increased,and the relative dynam-ic elastic modulus first increased and then decreased.When the amount of polypropylene fiber doping was 0.9 vol％,the minimum concrete quality loss rate was 1.38％,and the maximum relative dynamic elastic modulus was 90.45％.From the comprehensive analysis,it can be concluded that the mechanical properties and frost re-sistance of concrete with a polypropylene fiber doping content of 0.9 vol％are the best.
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