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通过在5%浓度硫酸铵溶液中长期浸泡,对不同水灰比、不同浆骨比、不同粉煤灰掺量的混凝土试件进行腐蚀试验研究,得到0~120 d腐蚀龄期下试件抗压强度的劣化规律。采用灰色关联分析方法研究了不同因素对混凝土抗压强度影响的显著程度,通过构建GM(1,1)预测模型对受硫酸铵腐蚀的混凝土强度劣化规律及服役寿命进行预测。结果表明:水灰比0.4、浆骨比0.28和粉煤灰掺量10%的受腐蚀混凝土抗腐蚀性能较强,随水灰比、浆骨比和粉煤灰掺量比例增大,抗压强度降幅明显。构建的GM(1,1)预测模型具有较高的精度,运用该模型在预测受腐蚀混凝土的寿命中,粉煤灰掺量10%、水灰比0.4及浆骨比0.28的受腐蚀混凝土分别比其它影响因素相同下的受腐蚀混凝土增加247%,125%,74%。
Through long-term immersion in 5% ammonium sulfate solution, the corrosion resistance of concrete specimens with different water-cement ratios, different ratios of mortar and different fly ash contents was obtained, and the specimen resistance was obtained under 0-120 d corrosion age The intensity of the deterioration of the law. Gray relational analysis was used to study the significance of different factors on the compressive strength of concrete. GM (1,1) prediction model was used to predict the strength deterioration and service life of concrete subjected to ammonium sulfate corrosion. The results show that the corrosive corrosion resistance of concrete with water-cement ratio of 0.4, pulp-bone ratio of 0.28 and fly ash content of 10% is stronger. With the increase of water-cement ratio, the ratio of mortar to bone and fly ash, Significant drop in intensity. The GM (1, 1) prediction model has high accuracy. Using this model to predict the corroded concrete life, corroded concrete with fly ash content of 10%, water-cement ratio of 0.4 and pulp-bone ratio of 0.28 Corroded concrete is 247%, 125%, 74% more corrosive than other factors.