Probability prediction method for chloride ion concentration of concrete surface of marine splash zone

Abstract

The invention discloses a probability prediction method for chloride ion concentration of a concrete surface of a marine splash zone. The method comprises the following steps of (1) building a random sample point calculation model of the chloride ion concentration of the concrete surface of the marine splash zone; (2) determining statistical eigenvalues of probability model parameters of different concretes of the marine splash zone, and generating random sample points of the probability model parameters; and (3) generating random sample points of the chloride ion concentration of the concrete surface of the marine splash zone, and determining a probability density function of the chloride ion concentration of the concrete surface of the marine splash zone. According to the method, the influence of a water-binder ratio, concrete types and exposure time can be comprehensively considered, and a probability distribution characteristic of the chloride ion concentration of the concrete surface of the marine splash zone can be reasonably described, so that the technical defect of a conventional deterministic prediction model is overcome.

Description

technical field [0001] The invention relates to a method for predicting the concentration of chloride ions on the surface of concrete, in particular to a method for probabilistically predicting the concentration of chloride ions on the surface of concrete in an ocean splash zone. Background technique [0002] Compared with the marine underwater area and the marine atmospheric area, the corrosion intensity of the marine splash area is higher, and it is an area where the durability of marine concrete structures deteriorates more seriously, and it is also a key control area for the durability analysis and design of marine concrete structures. Since the concentration of chloride ions on the surface of concrete is an important quantitative index reflecting the strength of the chloride environment in the ocean splash zone on the corrosion of concrete structures, it is also an important quantitative boundary condition for the quantitative analysis and design of the durability of con...

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Problems solved by technology

[0003] In 2016, Xu Xianzheng, Liu Ronggui, Yan Yongdong, and Li Congqi published a paper titled "Research on the Effect of Dry-Wet Time Ratio on Chloride Diffusion of Marine Concrete Structures", based on the field test data in the chloride environment of the ocean splash zone , analyzed the influence of dry-wet time ratio and compressive stress on the chloride ion concentration on the concrete surface in the ocean splash zone, but did not establish a prediction model for the chloride ion concentration on the concrete surface in the ocean splash zone

[0004] In 2017, Zhou Liping, Liu Rongjia, and Chen Yu published a paper titled "Study on the Time-Similar Relationship of Chloride Ion Concentration on the Surface of Marine Concrete", based on the field test data in the chloride environment of the ocean splash area, it revealed that ocean splash The time-varying characteristics of the chloride ion concentration on the concrete surface in the ocean splash zone, but there is no prediction model for the chloride ion concentration on the concrete surface in the ocean splash zone

[0005] JTS 153-2015 "Durability Design Standards for Water Transport Engineering Structures" issued by the Ministry of Transport of the People's Republic of China in 2015 uses the water-binder ratio as the control parameter to establish a prediction model for the concentration of chloride ions on the concrete surface in the ocean splash zone, but does not consider Effect of mineral admixture type and exposure time

[0006] In 2010, Wang Xiaozhou and Jin Weiliang published a paper titled "Research on the Chloride Ion Erosion Law in the Dry-wet Alternating Area of ​​the Concrete Structure of the Seaport Wharf". Based on the influence of humidity, seawater infiltration time and water-binder ratio, a prediction model for the chloride ion concentration on the concrete surface in the ocean splash zone was established, but the model did not consider the impact of the type of mineral admixture and the exposure time on the chloride ion concentration on the concrete surface, and It is established based on the on-site detection data of the specific geographical and environmental conditions of Zhapu Port Wharf in Zhejiang, and lacks universality

The model considers comprehensive factors, but it belongs to the deterministic prediction model, which can only guarantee the overall optimum of the prediction results and test values, but cannot describe the probability distribution characteristics of the chloride ion concentration on the concrete surface

[0008] In 2013, Zhong Xiaoping, Jin Weiliang, and Wang Yi published a paper titled "Criteria for Values ​​of Variable Effects of Concrete Structures in Port Engineering", combined with literature research and engineering experience, determined the concentration of chloride ions on the concrete surface in the ocean tidal splash zone However, the influence of the water-binder ratio, the type of mineral admixture and the exposure time on the probability distribution characteristics of the chloride ion concentration on the concrete surface in the ocean splash zone cannot be considered

[0009] In 2016, Pang Long, Ying Zongquan, Fan Zhihong, Tian Junfeng, and Li Quanwang published a paper titled "Environmental Load Model and Durability Analysis of Port Engineering Concrete Structure Based on Measured Data", based on the inspection report of the high-pile wharf in South China Seaport, A statistical model for the concentration of chloride ions on the concrete surface in the splash zone was proposed, but this model was established based on the field test data of the high-pile wharf in South China Seaport, which lacks universal applicability, and cannot take into account the water-binder ratio, mineral admixture, etc. Effects of aggregate type and exposure time on the probability distribution characteristics of chloride ion concentration on concrete surface in ocean splash zone

[0010] So far, there is no report on a probabilistic prediction method that can not only comprehensively consider the influence of water-binder ratio, concrete type and exposure time, but also reasonably describe the probability distribution characteristics of the chloride ion concentration on the concrete surface in the ocean splash zone

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