桥面用聚合物混凝土性能研究

Study on performance of polymer concrete used in bridge deck

采用试验研究了不同EVA乳液掺量的桥面用聚合物混凝土的抗压强度、抗折强度和弹性模量,并用折压比和弹性模量表征了聚合物混凝土的抗裂性。试验结果表明:随着聚合物掺量的增大,混凝土的抗压强度减小,抗折强度变化不大,折压比增大,韧性增加,抗裂性提高;随着聚合物掺量的增大,混凝土的弹性模量降低,变形适应性增强,抗裂性提高;聚合物的活性作用、桥键作用和充填作用改善了混凝土的物理结构及内应力,使得聚合物混凝土有较好的韧性及变形适应性。

The paper looks into the pressure resistance ,bending resistance and elastic modulus of deck-used polymer concrete of different EVA-emulsion contents, while incorporates the elastic modulus with the bending resistance- pressure resistance ratio in the assessment of cracking resistance performance. The results indicate that as the polymer content increases, the pressure resistance of the concrete goes down, while the bending resistance performance shows no visible change. In other words, the bending resistance-pressure resistance ratio raises, the toughness is strengthened and the cracking resistance is improved. At the same time, the elastic modulus is lowered, while the adaptability to deformation is enhanced. The physical structure and internal stress of the concrete samples are altered by the activity of the polymer, as well as the bridge bond effect and the filling effect of the specimen, as a result polymer concrete delivers prominent toughness and adaptability to deformation.