[雙語翻譯]--外文翻譯--由于氯化物攻擊導(dǎo)致混凝土結(jié)構(gòu)受損的仿真模型

1、- 1 -2670 單詞，16000 英文字符，5000 漢字出處：Takewaka K, Yamaguchi T, Maeda S. Simulation model for deterioration of concrete structures due to chloride attack[J]. Journal of Advanced Concrete Technology, 2003, 1(2): 139-146.外文文獻(xiàn)：S

2、imulation Model for Deterioration of Concrete Structuresdue to Chloride AttackKoji Takewaka1,Toshinobu Yamaguchi2and Satoshi Maeda3Received 13 January 2003,accepted 23 May 2003AbstractReinforced concrete structures in a

3、marine environment suffer deterioration caused by the corrosion of reinforcement.Various research projects have investigated this problem,yet few evaluation techniques have been developed until now.In this study,a simula

4、tion model for deterioration of concrete structures due to chloride attack was constructed.This model combines chloride and oxygen penetration models and a reinforcement corrosion model,taking into consideration variatio

5、ns in concrete quality and the existence of defects such as cracks.By using the proposed model,it was possible to estimate the progress of reinforcement corrosion and the corrosion crack generation timing in concrete.1.I

6、ntroductionRecently,the early deterioration of reinforced concrete structures has become a major problem.Reinforcement corrosion due to chloride attack can be considered as one of the main causes. Various research projec

7、ts have investigated this problem. However, there have been few evaluation techniques until now because of the variations in the quality of concrete, which is a porous material. The fact that experiments on deterioration

8、 take a long time has also been a contributing factor for the limited amount of data obtained thus far.In this study,construction of a simulation model for the deterioration of concrete structures due to chloride attack

9、has been attempted.This model combines chloride and oxygen penetration models and a reinforcement corrosion model,taking into consideration variations in concrete - 3 -where V(r)=density of pore volume of concrete,V(∞)=t

10、otal pore volume of unit concrete(m3/m3),r=radius of pore(m),and B and C=parameters that depend on W/C.According to their origin and characteristics,pores can be classified as macro pores,capillary pores and gel pores.S

11、ince capillary pores and macro pores are particularly relevant to the quality of concrete,the distributions of these two types of pores are considered dependent on W/C as shown in Fig.2(H.Uchikawa et al.1991).The two par

12、ameter values,B and C,used for each W/C are shown in Table 1.These values have been determined taking into consideration both actual concretedata and the parametric effect in the penetration model described in section 3.

13、3.2.3 Aggregate distributionRecent research shows a thin layer between the cement paste and aggregate,especially coarse aggregate,in concrete can more effectively explain the phenomena of chloride diffusion as well as ca

14、pillary pores.This thin layer is called the interface transition zone(ITZ).In order to consider the effects of ITZ,coarse aggregates 5 mm to 20 mm in diameter are set randomly in the model concrete.The volume in concrete

15、 and the size distribution of coarse aggregate are determined by the mix proportion of the concrete.In this research,JSCE code values are used as standard values(JSCE 2002).Total volume and size distributions are shown i

16、n Table 2 and Table 3,respec-tively.2.4 Relative water contentAdditionally,considering the effect of the relative water content of the concrete on the deterioration process, some of the macro and capillary pores are defi