高性能混凝土在沿海高速公路中的应用

发布时间：2018-03-22 08:28

本文选题：高性能混凝土　切入点：高速公路　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着土木工程建设的发展,高性能混凝土的应用越来越多,在公路、桥梁等基础设施上的应用最为广泛。高性能混凝土的性能被世界认为是最全面的。如高性能混凝土比普通混凝土强度高,具有良好的工作性能,且其体积稳定性和耐久性都较普通混凝土更加优越。论文以承(德)秦(皇岛)高速公路秦皇岛段所属桥梁的桩基础、承台、墩台、盖梁、预制梁、现浇梁等结构为研究对象,所涉及的混凝土标号为C30、C40、C50,所用混凝土总计方量约20万方。论文的主要研究内容为:(1)论述了高性能混凝土与普通混凝土结构、组份的不同并根据工程所处的实际环境和影响混凝土结构耐久性的各种因素,确定本工程高性能混凝土的原材料;(2)研究了高性能混凝土配合比的设计及优选方法。根据原材料品质、混凝土设计强度等级、耐久性对混凝土工作性能的要求设计配合比并现场调整。(3)养护是影响高性能混凝土性能的重要因素,本文研究了养护的原理及不同养护条件对混凝土强度的影响;由于本工程地处沿海地区,对高性能混凝土的Cl-离子渗透性实测了数据并进行了研究。(4)总结高性能混凝土的施工工艺,包括施工前准备、计量、搅拌、运输、浇筑、捣固、养护、温控等工作,并重点指出各工序施工中高性能混凝土与普通混凝土的不同之处。本工程各混凝土结构完工后,由实测数据得出:高性能混凝土的各项工作性能都达到良好的标准,强度及耐久性等各项指标都能达到设计要求;通过数据研究,高性能混凝土前期较后期强度增长较快,在养护龄期7 d内是其强度发展的关键阶段;随着水胶比的降低,混凝土结构致密性增强,抗Cl-渗透性越好。
[Abstract]:With the development of civil engineering construction, the application of high performance concrete is more and more, in the highway, The performance of high performance concrete is considered to be the most comprehensive in the world. For example, high performance concrete has higher strength than ordinary concrete and has good working performance. And its volume stability and durability are better than ordinary concrete. This paper takes the pile foundation, cap beam, precast beam and cast-in-place beam of Qinhuangdao section of Chengde (de) Qin (Huangdao) Expressway as the research object, and the pile foundation, pier abutment, cover beam, precast beam, cast-in-place beam, etc. The number of concrete involved is C30 / C40 / C50, and the total quantity of concrete used is about 200, 000 square meters. The main research contents of this paper are as follows: (1) the structure of high performance concrete and ordinary concrete is discussed. Different components and factors affecting the durability of concrete structures, depending on the actual environment in which the project is located and the factors affecting the durability of concrete structures, Determine the raw material of the high performance concrete of this project, study the mix proportion design of the high performance concrete and the optimization method. According to the quality of the raw material, the grade of the design strength of the concrete, The requirement of durability to the working performance of concrete. The design mix ratio and field adjustment. The curing is an important factor affecting the performance of high performance concrete. The principle of curing and the influence of different curing conditions on the strength of concrete are studied in this paper. Because the project is located in the coastal area, the measured data of Cl-ion permeability of high performance concrete are measured and studied. 4) the construction technology of high performance concrete is summarized, including preparation, measurement, stirring, transportation, pouring and tamping before construction. Maintenance, temperature control, etc., and points out the differences between high performance concrete and ordinary concrete. From the measured data, it is concluded that the performance of high performance concrete can reach the good standard, the strength and durability of high performance concrete can meet the design requirements, and through the data research, the strength of high performance concrete increases faster in the early stage than in the later period. With the decrease of water-binder ratio, the compactness of concrete structure is enhanced and the resistance to Cl-permeability is better.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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