无机聚合物混凝土水化过程和碳化性能研究

发布时间：2018-10-17 17:15

【摘要】：无机聚合物有绿色环保、快速固化、耐高温和耐腐蚀等方面的优势，但同时它也有收缩率大以及抗碳化能力差的劣势。因此，研究如何规避无机聚合物混凝土劣势的技术手段具有重要的理论研究价值与工程实践意义。本文在大量的试验和理论研究的基础上，就无机聚合物混凝土(IPC,inorganic polymer concrete)和无机聚合物钢管混凝土(IPCS, inorganic polymerconcrete filled steel tube)进行了水化过程、收缩性能和碳化性能研究。最终论证了钢管约束解决无机聚合物混凝土碳化明显的问题，且膨胀剂掺入解决无机聚合物混凝土收缩大的问题，为提出无机聚合物钢管混凝土组合结构提供了理论基础。 1根据原材料、胶凝材料和混凝土的微观结构分析，在分析IPC水化过程中水化热的基础上，得出了无机聚合物混凝土水化机理、水化产物以及水化放热曲线。结果表明，IPC密实度和胶凝材料质量优于普通混凝土，同时掺入膨胀剂后的IPC碱性物质增多。 2在试验的基础上，以膨胀剂掺量为参数，研究了IPCS水化阶段截面测点的温度场分布。结果表明，试件IPCS-6与试件IPCS-0温度场变化规律相似，膨胀剂的掺入对温度场峰值有一定影响（试件截面处中点在水化过程中温度峰值IPCS-6比IPCS-0高1.6oC）。 3在试验的基础上，以膨胀剂掺量为参数，研究了IPC和IPCS收缩性能。结果表明，IPCS中核心混凝土相应的收缩变形小于IPC，膨胀剂对其收缩性能有较大影响（试件IPC-8在21d时收缩率仅有试件IPC-0的1/5左右，试件IPCS-8在21d时收缩率仅有试件IPCS-0的1/6左右），掺入膨胀剂后的IPCS明显改善了无机聚合物混凝土的收缩性能。 4在系统试验和理论分析的基础上，，以膨胀剂掺量为参数，研究了IPC和IPCS碳化性能。结果表明，不同原材料的IPC碳化性能相差较大（试件碳化深度：IPC-0＜IPC-slag/fly ash）；膨胀剂对其碳化性能有较大影响（试件各个龄期下的碳化深度：IPC-8＜IPC-6＜IPC-4＜IPC-2＜IPC-0），掺入膨胀剂后的IPC明显改善了无机聚合物混凝土的碳化性能。同时IPCS加速碳化后碳化深度为0mm，论证了IPCS完全解决了无机聚合物混凝土碳化明显的问题。
[Abstract]:Inorganic polymers have the advantages of environmental protection, rapid curing, high temperature resistance and corrosion resistance, but they also have the disadvantages of high shrinkage and poor carbonization resistance. Therefore, it has important theoretical research value and engineering practical significance to study how to avoid the disadvantage of inorganic polymer concrete. Based on a large number of experiments and theoretical studies, the hydration process, shrinkage and carbonation properties of inorganic polymer concrete (IPC,inorganic polymer concrete) and inorganic polymer concrete filled steel tube (IPCS, inorganic polymerconcrete filled steel tube) have been studied in this paper. Finally, it is demonstrated that steel pipe restraints solve the obvious problem of inorganic polymer concrete carbonization, and the expansion agent is added to solve the problem of large shrinkage of inorganic polymer concrete. This paper provides a theoretical basis for putting forward the composite structure of concrete filled inorganic polymer steel tubes. 1 according to the microstructure analysis of raw materials, cementitious materials and concrete, the hydration heat in the hydration process of IPC is analyzed. The hydration mechanism, hydration products and hydration heat release curve of inorganic polymer concrete were obtained. The results show that the density of IPC and the quality of cementitious material are better than that of ordinary concrete. At the same time, the alkalinity of IPC is increased after the addition of expansive agent. 2 on the basis of experiment, the quantity of dilatant is taken as the parameter. The temperature field distribution of cross section measurement points in IPCS hydration stage was studied. The results show that the temperature field of IPCS-6 is similar to that of IPCS-0, and the temperature peak value (IPCS-6) at the middle point of the specimen section is higher than that of IPCS-0 in the hydration process. 3 on the basis of the experiment, the temperature field peak value is affected by the addition of expansive agent. The shrinkage properties of IPC and IPCS were studied by using the amount of expansive agent as parameters. The results show that the shrinkage deformation of core concrete in IPCS is smaller than that of IPC, expansion agent, and the shrinkage rate of IPC-8 is only about a fifth of that of IPC-0 at 21d. The shrinkage rate of IPCS-8 was only about 1 / 6 of that of IPCS-0 at 21d. The shrinkage of inorganic polymer concrete was obviously improved by IPCS with dilatant. 4 on the basis of systematic test and theoretical analysis, the content of expansive agent was taken as parameter. The carbonization properties of IPC and IPCS were studied. The results show that the carbonization properties of IPC of different raw materials differ greatly (the carbonation depth of the specimen is IPC-0 < IPC-slag/fly ash);). The carbonation properties of the specimens were greatly affected by the expansive agent (IPC-8 < IPC-6 < IPC-4 < IPC-2 < IPC-0), and the carbonation properties of inorganic polymer concrete were improved obviously by the addition of the expansive agent IPC. At the same time, the carbonation depth of IPCS accelerated carbonization is 0 mm, which proves that IPCS completely solves the obvious problem of inorganic polymer concrete carbonization.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528

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