摘要
随着高层大跨度及有特殊功能要求建筑物的设计建造,混凝土朝着更高强度、更高耐久性和更高可靠性的方向发展,在这种背景下,超高性能混凝土(UHPC)应运而生,因其能改善环境、提高经济效益、解决工程中的疑难问题,且具备优异的力学性能和耐久性能,成为学者研究的热门课题。本文从基本设计原理、优异的物理性能、环保性能、相关标准的建立情况以及工程应用情况出发,对UHPC的研究和应用进展进行了详细的说明,同时提出UHPC发展的趋势和研究重点:一是通过优化UHPC的配合比设计和原材料选择,降低其浆体的粘度,采用价格低廉的固体废弃物替代部分现有的UHPC原材料,降低UHPC的成本;二是研究合理的养护方式,降低现有养护方式的高能耗和高成本,同时促进未水化水泥的水化进程;三是发展钢丝(钢筋)网骨架增强UHPC和少纤维甚至无纤维UHPC,不仅能够降低UHPC的成本,而且能提升UHPC的抗折、抗压强度;四是针对UHPC的特性制定耐久性标准,为日后UHPC的进一步推广应用提供指导和建议。
With the design and construction of high-rise buildings with large spans and special functional requirements,concrete is developing towards higher strength,durability,and reliability.In this context,ultra-high performance concrete(UHPC)has emerged as the times require.Due to its ability to improve the environment,increase economic benefits,solve difficult engineering problems,and possess excellent mechanical and durability properties,it has become a hot research topic for scholars.This article provides a detailed explanation of the research and application progress of UHPC based on its basic design principles,excellent physical properties,environmental performance,establishment of relevant standards,and engineering applications.At the same time,it proposes the development trend and research focus of UHPC:firstly,it is to optimize the mix design and raw material selection of UHPC,reduce the viscosity of its slurry,and replace some existing UHPC raw materials with low-cost solid waste to reduce the cost of UHPC;secondly,it is to study reasonable maintenance methods to reduce the high energy consumption and high cost of existing maintenance methods,while promoting the hydration process of unhydrated cement;thirdly,the development of steel wire(steel bar)mesh skeleton reinforcement for UHPC and low fiber or even no fiber UHPC can not only reduce the cost of UHPC,but also improve the flexural and compressive strength of UHPC;fourthly,it is to develop durability standards based on the characteristics of UHPC,provide guidance and suggestions for further promotion and application of UHPC in the future.
出处
《混凝土世界》
2023年第12期74-79,共6页
China Concrete
基金
国家能源投资集团有限责任公司科技创新项目(编号:GJNY-23-31-1)。
关键词
超高性能混凝土
设计原理
耐久性
工程应用
Ultra-high performance concrete
design principle
durability
engineering application
