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文章结合浙江省台州市路桥区4号桥桥头跳车处治工程,对作为台后填料的EPS混凝土各项性能进行研究,试验表明EPS颗粒与混凝土的密度相差悬殊,采用控制用水量及添加外加剂的方法能有效控制EPS混凝土的分层离析现象。EPS颗粒在混凝土搅拌及成型过程中,受到水泥浆体、砂、石集料的挤压及混凝土自重的影响,容易产生压缩变形,压缩率为40%左右。EPS混凝土受力破坏过程与普通混凝土有所不同,表现出塑性材料的部分特点,EPS混凝土弹性模量小,约为普通混凝土(以C15为例)的1/3～1/10。通过对微硅粉、粉煤灰等外加剂对EPS混凝土性能的影响研究表明,掺入微硅粉的掺入,有效减少了EPS混凝土的泌水离析,增强了混凝土的抗折强度,但对EPS混凝土的抗压强度改善不明显,粉煤灰对EPS混凝土的和易性有改善作用,但减弱EPS混凝土抗折、劈裂强度,减少弹性模量。
In this paper, we studied the performance of EPS concrete as the filler in the stage of Qiaotou Touqiao No.4 Bridge in Luqiao District, Taizhou, Zhejiang Province. The results show that the density of EPS particles is quite different from that of concrete. The control water consumption and admixture Method can effectively control the stratification of EPS concrete segregation phenomenon. EPS particles in the concrete mixing and molding process, by the cement slurry, sand, stone aggregate extrusion and concrete weight, prone to compressive deformation, the compression rate of about 40%. The stress and failure process of EPS concrete is different from that of ordinary concrete and shows some characteristics of plastic materials. The EPS modulus of EPS concrete is small, which is about 1/3 to 1/10 of normal concrete (C15, for example). Through the study of the effect of micro-silica fume and fly ash on the properties of EPS concrete, it is found that the incorporation of micro-silica fume can effectively reduce the bleeding segregation of EPS concrete and enhance the flexural strength of concrete, EPS concrete compressive strength improvement is not obvious, fly ash on the workability of EPS concrete to improve the role, but weakened EPS concrete bending, splitting strength, reduce the elastic modulus.