PVC复合塑料模板基本力学性能研究

发布时间：2018-07-20 13:09

【摘要】：随着现浇混凝土模板工程的不断发展，新型模板材料及模板形式日益增多，如普通胶合板、钢框胶合板、全钢大模板等，其中以木质胶合板的应用最为广泛。但是，木材的大量使用，并不符合国家可持续发展的战略，因此，采用新材料取代胶合板成为模板行业发展的必然趋势。新型PVC复合塑料模板采用废旧PVC塑料及木粉为生产原料，板材采用挤出成型，制作工艺简单，模板循环利用次数高，可回收利用，性价比较高，在新型模板中占据优势地位。本文在总结国内外新型模板研究及应用的基础上，通过大量的试验，对特定配方下的PVC基复合塑料模板的材料性能及模板的工作性能做了充分的研究，为新型模板工程的应用及推广提供了理论基础，本文的主要研究成果如下： (1)根据塑料制品及模板的相关规范，对PVC复合塑料模板材料进行了拉伸性能及弯曲性能试验研究，确定了同一种材料在不同试验方式下的强度及弹性模量，并根据已有的本构模型，结合试验数据，提出了特定配方下PVC基复合塑料模板材料的拉伸及弯曲本构方程。结果表明，同一种PVC复合塑料模板材料，其在不同受力状态下的本构方程虽然存在一定的相关性，，但不是重合的。 (2)在常温状态下，对不同间距支撑的PVC复合塑料模板进行模拟施工加载试验，通过数据分析获得了能够使材料不发生残余变形的最大荷载，在支撑间距为200mm，250mm，300mm时，模板不发生残余变形的最大荷载分别为6kN/m2，6kN/m2，5kN/m2。 (3)研究了PVC复合塑料模板在温度和荷载综合作用下的反应，在5kN/m2的荷载作用下，进行模板的逐级升温降温循环试验，得出了模板在热力综合作用下不发生残余变形的最大温度，在支撑间距为200mm时，该模板不发生残余变形的最大安全温度为60℃。 (4)根据PVC复合塑料模板在实际工程应用中出现的热变形累积现象及模板的热力耦合试验结果，分析讨论了处理的模板热变形累积问题的方法。
[Abstract]:With the continuous development of cast-in-place concrete formwork engineering, the new formwork materials and formwork are increasing, such as common plywood, steel frame plywood and all steel large formwork, among which wood plywood is the most widely used. However, the large use of wood does not conform to the strategy of sustainable development of the country, so the new material is used to replace the glue. Plywood has become an inevitable trend in the development of template industry. The new PVC composite plastic template is made of waste PVC plastic and wood powder as the raw material. The plate is extruded by extrusion molding. The manufacturing process is simple, the cycle use times of the template are high, and the performance price ratio is high, and it occupies the dominant position in the new type of formwork.
On the basis of summarizing the research and application of new formwork at home and abroad, through a large number of experiments, the material properties and working performance of the PVC based composite plastic formwork under specific formula are fully studied. The theoretical foundation is provided for the application and popularization of the new template engineering. The main research results of this paper are as follows:
(1) according to the relevant specifications of plastic products and formwork, the tensile properties and bending properties of PVC composite plastic formwork materials were tested. The strength and modulus of elasticity of the same material under different test modes were determined. According to the existing constitutive model and the experimental data, the PVC based composite plastic template under specific formula was put forward. The tensile and bending constitutive equations of the material show that the constitutive equation of the same PVC composite plastic template has a certain correlation in different stress states, but it is not a coincidence.
(2) under the normal temperature state, the simulated construction loading test of PVC composite plastic template with different spacing support is carried out. The maximum load that can make the material without residual deformation is obtained by data analysis. The maximum load of the template without residual deformation is 6kN/m2,6kN/m2,5kN/m2. when the support spacing is 200mm, 250mm, and 300mm.
(3) the reaction of PVC composite plastic formwork under the comprehensive effect of temperature and load was studied. Under the load of 5kN/m2, the cycle test of step by step temperature drop of the template was carried out, and the maximum temperature of the formwork without residual deformation was obtained under the comprehensive thermodynamic effect. The maximum safety of the formwork without residual deformation when the support spacing was 200mm was obtained. The temperature is 60 degrees centigrade.
(4) according to the thermal deformation accumulation in the practical engineering application of PVC composite plastic template and the thermal coupling test result of the template, the method of the heat deformation accumulation of the treated template is analyzed and discussed.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU755.2

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