环氧树脂/木质碎料复合材料力学性能

Mechanical properties of epoxy resin/wood chips composite

以环氧树脂为胶结材料、不同类型的砂和木质碎料作为集料,利用平板振捣器,采用振实法制备了树脂基木质碎料复合材料。分析环氧树脂用量、木质碎料用量以及砂类型对树脂基木质碎料复合材料的抗折、抗压强度的影响规律。结果表明:试件的最大抗压、抗折强度分别可达5.74和17.16 MPa;在相同胶集比下,试件强度随着木质碎料掺入量的增加而减小;而在相同木砂比下,试件强度随着树脂掺量的增加而提高;随着木质碎料减少和树脂含量的增加,使用不同种类的砂制备的试件力学强度逐渐增加,但增长速率变小;在相同配比的情况下,河砂配制试件的抗压、抗折强度分别高于标准砂配制试件的22%和12%;试件在抗折试验中出现斜裂缝,且一侧为翘起变形的拔出形破坏形态。通过正交试验分析确定了木砂比为试件力学性能的主要影响因素,最佳配比中木砂质量比为1∶3(采用河砂)、胶集比[树脂质量/(木屑+砂)的总质量]为0.3。试验表明利用木质碎料制备树脂基复合材料是切实可行的,为废弃木材的利用开辟了一条新途径,可为木质碎料与树脂形成树脂基木质碎料道路铺装材料的研究与推广提供参考。

Since the treatment and utilization of waste wood in China have not received enough attention,it has been caused environmental pollution and other problems.By using epoxy resin as the cementing material,different types of sand and wood chips as aggregates,the resin-based wood chip composites were prepared by the flat vibrator and a compaction method.The effects of the epoxy resin dosage,wood chip dosage and sand type on the flexural and compressive strengths of resin-based wood chip composites were analyzed.The results showed that the maximum compressive and flexural strengths of the test specimens can reach 5.74 and 17.16 MPa,respectively.At the same binder-aggregate ratio,the strength of the test specimen decreased with the increase of the amount of wood particles.At the same wood-sand ratio,the strength of the specimen increased with the increase of the resin content.With the decrease of wood chips and the increase of resin content,the compressive and flexural strengths of specimens prepared with different types of sand gradually increased,but the growth rate became smaller.When the binder-aggregate ratio and wood-sand ratio were constant,the compressive strength and flexural strength of the test specimens prepared with river sand were 22% and 12% higher than those of the standard sand specimens,respectively.In the flexural test,the specimen had a pull-out failure form of oblique cracks and one side deformation.According to the results of the flexural and compressive strength tests of the resin-based wood pellet composite material,the orthogonal analysis was carried out from the three aspects of binder-aggregate ratio,wood-sand ratio,and sand type.It was discovered that the wood-sand ratio was the dominant factor for the mechanical properties of the test specimens.The optimum ratio for the wood/river sand was 1:3(using river sand),for the glue/aggregate ratio of 0.3.The test results showed that it was feasible to prepare resin-based composite materials using wood chips,epoxy resin and sand,which opens up a new way for the utilization of waste wood,and also has the positive significance for resource saving and ecological benefits.This study can provide a reference for the promotion and application of resin-based wood scrap road paving materials made from wood scraps and resins.