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RISS 인기검색어
- 검색키워드
- 저자 : Theogene Hakuzweyezu (검색결과 2 건)
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Life Prediction Model of Nano-CaCO3 Modified Concrete in Sulfate Environment
Theogene Hakuzweyezu,Hongxia Qiao,Chenggong Lu,Bo Yang,Kan Li 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.8
In the saline soil environment, the salts corrode the ordinary cement concrete seriously, and concrete structures deteriorate gradually until it fails, which impedes the practical application of ordinary Portland cement concrete in this area. Aiming at the durability problems of concrete in a harsh environment, this paper selects the coefficient of compressive strength, coefficient of flexural strength, relative dynamic elastic modulus, and relative mass to jointly evaluate the resistance of nano-CaCO3 modified concrete to sulfate corrosion. More importantly, the Wiener process for modeling the degradation process of concrete specimens was used to obtain the remaining life's reliability function. The results indicated that adding 1% nano-CaCO3 (Nano Calcium Carbonate) can enhance the resistance of concrete to sulfate corrosion, and the service life of concrete will increase significantly. The Random Wiener process can effectively predict the durability deterioration process of concrete specimens. By integrating the deterioration process's life data, this method's reliability function may directly reflect the concrete's life.
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Durability Model of Exposed Concrete On-Site Based on Dual Coupling Factors
Yong Fu,Hongxia Qiao,Chenggong Lu,Theogene Hakuzweyezu,Fei Guo 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1
Aiming at the problem that the reliability analysis of the outdoor exposed concrete structure under the action of a single factor is not consistent with the actual service environment, a reliability analysis based on the Copula function describing multiple degradation factors is proposed. According to the actual data collected on-site, the relative quality evaluation parameters (RQEP) and relative dynamic elastic modulus evaluation parameters (RDEMEP) was selected as the key degradation indicators, and the Aperture Information Criterion (AIC) was used to determine the optimal marginal distribution function in different degradation trajectories, and obtain the most optimal edge distribution function under a single factor. Optimize the edge distributions reliability curve, establish the relationship between the edge distributions through the Copula function, and couple the edge distributions of the remaining life of the concrete to obtain the joint reliability function of the concrete under the action of the coupling factors. The results show that the selection of two degradation indicators, RQEP and RDEMEP, is helpful in establishing the concrete life prediction model in the field exposure environment, and the RDEMEP are more sensitive to the field exposure environment than the RQEP. The Gumbel Copula distribution function can reasonably predict the reliability of exposed concrete on-site under dual coupling factors. The service life of C40 and C50 exposed concrete on site is about 400 and 550 months, respectively.
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