钢桥面刚性铺装环氧树脂碎石黏结层性能优化试验研究

Experimental Study on Performance Optimization of Epoxy Resin Macadam Adhesive Layer for Rigid Pavement of Steel Bridge Deck

为了优化钢桥面刚性铺装环氧树脂碎石黏结层的组成设计,通过控制变量法来探究各组成要素的影响规律与合理范围,之后在合理范围基础上设计并开展正交试验,分析各因素影响程度及黏结层最优组成。结果表明:三因素最佳范围为碎石粒径2.36~4.75 mm、4.75~9.5 mm、9.5~13.2 mm;碎石用量1.5 kg/m^(2)、2 kg/m^(2)、2.5 kg/m^(2);环氧树脂用量1.2 kg/m^(2)、1.4 kg/m^(2)、1.6 kg/m^(2)。除高温拉拔强度外,其他三个指标影响因素顺序均一致,从大到小依次为A>C>B,即碎石粒径>环氧树脂用量>碎石用量。综合考虑钢桥面铺装性能需求及现场施工和易性,提出一种优化组合方案A2B2C2,即碎石粒径4.75~9.5 mm、碎石用量2 kg/m^(2)、环氧树脂用量1.4 kg/m^(2)的环氧树脂碎石黏结层组成。

In order to optimize the composition design of epoxy resin macadam adhesive layer for rigid pavement of steel bridge deck,the influence and reasonable range of each component element were explored through the control variable method,and then orthogonal test was designed and carried out on the basis of the reasonable range to analyze the influence degree of each factor and the optimal composition of the adhesive layer.Results indicated that the best range of the three factors was gravel particle size of 2.36~4.75 mm,4.75~9.5 mm and 9.5 ~13.2 mm,gravel dosage of 1.5 kg/m^(2), 2 kg/m^(2), 2.5 kg/m^(2),epoxy resin dosage of 1.2 kg/m^(2), 1.4 kg/m^(2),1.6 kg/m^(2).Except for the high temperature pull-off strength,the order of the other three factors was the same,from large to small is A>C> B,which was,the particle size of crushed stone> the amount of epoxy resin> the amount of crushed stone.Considering the performance requirements of steel deck pavement and the workability of site construction,an optimized combination scheme A2 B2 C2 was proposed,which was composed of epoxy resin bonded layer with gravel particle size of 4.75~9.5 mm,gravel dosage of 2 kg/m^(2)and epoxy resin dosage of 1.4 kg/m^(2).