高性能混凝土及其工程施工质量控制技术

发布时间：2018-04-22 13:11

本文选题：高性能混凝土 + 外加剂　；参考：《安徽建筑大学》2015年硕士论文

【摘要】：从高性能混凝土概念提出以来,人们对发展高性能混凝土比较重视和关注,但由于高性能混凝土属于新技术,目前还处于不断发展、完善过程之中,在工程应用过程中还存在一些需要改善的地方,对此各国学者也不断对高性能混凝土进行全面研究,为高性能混凝土进一步推广应用提供技术支撑。近年来,在工程结构领域高性能混凝土的使用得到广泛发展,且使用量巨大,但是人们也普遍认识到如何充分发挥高性能混凝土的经济效益,提高其综合性能,保证建设工程质量,满足工程建设需要,成为高性能混凝土急需研究的课题。本文首先从高性能混凝土的各项组成材料入手,研究分析了水泥、粗细骨料、外加剂、矿物掺合料对高性能混凝土综合性能的影响,并通过试验研究分析高性能混凝土各种组成材料在使用和选择上对其性能的影响程度,通过对比分析提出了高性能混凝土对各种组成材料选择和使用的基本技术要求。由于高性能混凝土具有低水胶比、高工作性的特征,在原材料选择上要选择优质、质量稳定好的组成材料,同时,除水泥、骨料、水传统基本组成材料外,必须掺入外加剂和矿物掺合料,外加剂和矿物掺合料的品种和掺量对高性能混凝土的性能影响非常大,掺量不宜过大,要控制合适的掺量比例,同时通过双掺矿物掺合料能显著改善高性能混凝土的性能。同时要实现混凝土的高性能化,除选择优质、合适的组成材料外,各项组成材料的掺入比例及混凝土的配合比设计工作也至关重要,本文接着对高性能混凝土配合比设计进行研究,综合分析了高性能混凝土在配合比设计时需要满足的基本原则,并选取水胶比、砂率、粉煤灰、硅灰作为影响高性能混凝土性能的四个主要因素,通过正交试验设计进行混凝土配合比设计,根据正交试验结果的极差分析研究各项影响因素的主次顺序,提出了最佳配合比设计。养护是高性能混凝土质量形成过程中的重要环节,直接关系到其强度发展的稳定性,由于目前高性能混凝土的养护受到工程环境和结构部位的影响,单一的养护方法已经不能满足工程实际的需求,本文通过不同的养护方法对高性能混凝土强度和耐久性的影响进行对比分析,提出了早期进行覆盖养护,后期进行水中浸水的分阶段养护法,同时未来高性能混凝土的养护方法将向复合养护方向发展,采用多种养护技术才能有力保障混凝土的强度和耐久性能。最后本文结合现有的普通混凝土工程质量控制体系和高性能混凝土质量形成过程,提出建立了事前控制、事中控制和事后控制的高性能混凝土质量控制体系,并从原材料的选择、配合比的设计、混凝土的生产、施工、养护等环节进行全面的质量控制,各环节、各阶段遵循动态控制原理,发现问题及时纠偏,确保高性能混凝土的质量满足工程建设的需要
[Abstract]:Since the concept of high performance concrete (HPC) was put forward, people have paid more attention to the development of HPC. However, since HPC is a new technology, it is still in the process of continuous development and improvement. In the process of engineering application, there are still some areas that need to be improved. Scholars from all over the world have also been doing comprehensive research on high performance concrete, which provides technical support for the further popularization and application of high performance concrete. In recent years, the use of high performance concrete in engineering structure has been widely developed, and the use of high performance concrete is huge. However, people generally realize how to give full play to the economic benefits of high performance concrete and improve its comprehensive performance. To ensure the quality of construction and to meet the needs of construction has become an urgent research topic for high performance concrete (HPC). In this paper, the influence of cement, coarse aggregate, admixture and mineral admixture on the comprehensive properties of high performance concrete is studied. The influence of the use and selection of various components of high performance concrete on its performance is analyzed through experimental research. The basic technical requirements for the selection and use of various components of high performance concrete are put forward by comparison and analysis. Because high performance concrete has the characteristics of low water / binder ratio and high workability, it is necessary to select high quality and good quality components in the selection of raw materials, besides cement, aggregate and water traditional basic composition materials. Admixture and mineral admixture must be added. The variety and amount of admixture and mineral admixture have great influence on the performance of high performance concrete. At the same time, the properties of high performance concrete can be improved by double mineral admixture. At the same time, in order to realize the high performance of concrete, in addition to selecting high quality and suitable composition materials, it is also very important to design the proportion of each component material and the mix ratio of concrete. In this paper, the design of mix ratio of high performance concrete is studied, and the basic principles of mix ratio design of high performance concrete are comprehensively analyzed, and the water binder ratio, sand ratio, fly ash, sand ratio and fly ash are selected. Silica fume, as the four main factors affecting the performance of high performance concrete, is designed by orthogonal experimental design. According to the range analysis of the results of orthogonal test, the order of influencing factors is studied. The optimum mix ratio design is put forward. Curing is an important link in the forming process of high performance concrete quality, which is directly related to the stability of its strength development. At present, the maintenance of high performance concrete is affected by the engineering environment and structure position. The single maintenance method can no longer meet the practical requirements of engineering. This paper compares and analyzes the influence of different curing methods on strength and durability of high performance concrete, and puts forward that early coverage maintenance should be carried out. At the same time, the curing method of high performance concrete in the future will be developed towards the direction of composite curing. The strength and durability of concrete can be guaranteed by adopting various curing techniques. Finally, combining with the existing quality control system of ordinary concrete engineering and the forming process of high performance concrete quality, the paper puts forward the establishment of high performance concrete quality control system, which is pre-control, in-process control and post-control. And from the selection of raw materials, mix ratio design, concrete production, construction, maintenance and other links to carry out a comprehensive quality control, each link, each stage of the dynamic control principle, found that the problem timely correction, Ensuring the quality of High performance concrete to meet the needs of Engineering Construction
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU755

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