高性能混凝土的裂缝产生原因分析和防治技术

发布时间：2018-04-11 00:02

本文选题：裂缝 + 高性能混凝土　；参考：《河北工业大学》2013年硕士论文

【摘要】：裂缝是混凝土结构普遍存在的现象，也是影响混凝土结构长期耐久性的主要因素之一。和抗渗性，抗冻性，耐磨性和耐久性指数不同，裂缝是难以量化的指标。由于裂缝产生的原因复杂，裂缝计算分析，预防和控制措施的选择一直困扰着工程技术人员。近年来，随着工程界不断关注混凝土的耐久性，以高强度为主要特征的高性能混凝土得到越来越“高性能”的错误理解，往往在设计和施工过程中陷入很多误区，如过分追求高强度、低渗透性能等，但忽视更容易产生、更严重、同时对混凝土结构整体性潜在危害更大的裂缝问题。高性能混凝土通过采用低水灰比、高标号水泥、大水泥用量等多种措施，使混凝土强度等级达到高强度，但措施不当将加大混凝土早期收缩的趋势，增大混凝土早期开裂的风险。同时混凝土施工时振捣情况、养生条件等也会对产生后期裂缝有影响。本文通过对高性能混凝土的理论研究，，总结出选择合适的原材料，优化配比参数，找出基于合理的性能-配比参数，用更加科学合理的方法来设计高性能混凝土，同时实践经验以及试验是高性能混凝土设计的主要依据；结合高性能混凝土主要裂缝类型即：温度裂缝、表面塑性裂缝、干燥收缩裂缝及硬化后期裂缝，对混凝土裂缝产生多角度原因，以及实际施工过程中及施工完成后裂缝产生机理与防治措施等进行了深入研究，为今后防止出现类似的高性能混凝土开裂的施工工艺提供参考。
[Abstract]:Crack is a common phenomenon in concrete structure, and it is also one of the main factors that affect the durability of concrete structure.Different from impermeability, frost resistance, wear resistance and durability index, cracks are difficult to quantify.Because of the complex causes of cracks, the selection of fracture calculation and analysis, prevention and control measures has been puzzling engineering technicians.In recent years, with the engineering circles paying more and more attention to the durability of concrete, the high performance concrete with high strength as the main characteristic gets more and more "high performance" misunderstandings, which often fall into many misunderstandings in the process of design and construction.Such as excessive pursuit of high strength, low permeability and so on, but neglect is more easy to produce, more serious, at the same time to the concrete structure of the potential harm to the integrity of the crack problem.The strength grade of high performance concrete can reach high strength by adopting many measures, such as low water-cement ratio, high grade cement, large cement content, etc., but improper measures will increase the trend of early shrinkage of concrete.Increase the risk of early cracking of concrete.At the same time, the vibration and health conditions of concrete construction will also affect the later cracks.Through the theoretical study of high performance concrete, this paper summarizes the selection of suitable raw materials, optimizes the matching parameters, finds out the reasonable performance-proportioning parameters, and uses more scientific and reasonable methods to design high performance concrete.At the same time, the practical experience and test are the main basis for the design of high performance concrete, combining with the main crack types of high performance concrete, that is, temperature crack, surface plastic crack, dry shrinkage crack and late hardening crack,This paper makes a thorough study on the causes of concrete cracks from various angles, the mechanism and prevention measures of cracks in the actual construction process and after the completion of construction, which provides a reference for the construction technology of preventing similar high performance concrete cracking in the future.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528

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