Abstract: In order to investigate the influence of the length and doping amount of short-cut polypropylene fibers on the strength of short-cut polypropy-lene fiber-phosphorus gypsum composites, a homogeneous experimental scheme was used to analyze the changes of the adiabatic flexural strength and compressive strength of 3mm, 6mm and 9mm short-cut polypropylene fibers at the doping amounts of 0%—2.8%. The NSGM(1,3) model was used to model and predict the strength of the composites, and the results showed that: with the increase of fiber length, the adiabatic flexural strength and compressive strength of the composites increased with the increase of fiber length at the same fiber doping level; with the increase of fiber doping level, the adiabatic flexural strength and compressive strength of the composites showed a trend of first increasing and then decreasing at the same fiber length; the NSGM(1,3) model established in this paper was used to predict the strength of the composites. The NSGM(1,3) model can achieve the effective simulation and prediction of the dry flexural strength and compressive strength of short-cut polypropy-lene fiber-phosphorus building gypsum with the average relative simulation error of 1.04% and 1.57%, and the average relative prediction error of 6.80% and 7.13%.
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2021, Vol. 35 
