Application Research On High-strength Concrete In Civil Engineering

High-strength concrete is one of the main directions of the development of new building materials. Due to the use of high-strength concrete on high-rise and ultra-high-rise building structures with excellent durability and safety, as well as decreasing section size, which makes the weight reduced, it has certain economic benefits. At the same time, the concrete consumption reduced which have a certain effect on energy saving and environmental protection. As high-strength concrete has brittle characteristics, it is mainly used on vertical component in civil engineering; besides, high-strength concrete has high heat of hydration, it rises and drops temperature fast in small component of civil engineering, the problem of unequal shrinkage on junction of vertical components of high-strength concrete and horizontal components of ordinary concrete lead to concrete cracking. In the terms of construction methods, high-strength concrete has different characteristics comparing with ordinary concrete, including concrete preparation, placement, curing, et al. Study of these areas has great significance for the promotion and application of high-strength concrete in modern civil engineering.Firstly, the development and research of high-strength concrete at home and abroad were expounded, and the advantages and disadvantages as well as the problems of it encountered in the practical application were analyzed. The theoretical basis of the concrete thermal stress calculation method was put forward. The shrinkage categories of concrete, the computation theory of shrinkage strain and the shrinkage forecast models at home and abroad were summarized too.Secondly, Combined with the Hefei Tianshi Square project, real-time tracking and monitoring were conducted on hydration heat and strain of high-strength concrete in the site using advanced monitoring equipments. The laws of hydration heat and shrinkage strain of high-strength concrete were grasped by measuring, which provided references for high-strength concrete’s pouring and curing during the later project. The temperature and stress on local components were simulated by MIDAS finite element analysis software and compared with measured data. Furthermore, a comparative analysis was carried out about the structural design features, the economy and overall efficiency and the structural durability of this project under high-strength concrete and ordinary concrete.Finally, a systematic exposition was done about the high-strength concrete’s preparation, construction technology, quality assurance measures, et al. A comprehensive summary of the project’s high-strength concrete construction technology was also conducted. The qualities of the project about concrete surface free of cracks, the strength of concrete and the concrete surface perception were achieved satisfactory results by theoretical research, measured analysis and careful construction, which provided references for similar projects.Based on the research and summary, the application of high-strength concrete in civil engineering was comprehensively studied, which provided the basis for the future large-scale promotion and application of high-strength concrete.