| 1. | Effect of drying - wetting cycles on chloride diffusion in concrete exposed to high concentration brine 干湿循环对混凝土在高浓度卤水中氯离子扩散行为的影响 |
| 2. | Standard test method for determining the apparent chloride diffusion coefficient of cementitious mixtures by bulk diffusion 用粒状料扩散法测定水泥混合物表面氯化物扩散系数的标准试验方法 |
| 3. | Measurement of the steady and non - steady - state chloride diffusion coefficients in a migration test by means of monitoring the conductivity in the anolyte chamber comparison with natural diffusion tests 很多混凝土科学工作者都在积极努力的发展氯离子传输和检测理论及试验室方法,目前理论及试验室检测标准众多,但尚无明确的现场检测标准。 |
| 4. | Water cement ratio and mixing fly ash or slag into concrete effect on ability of resisting chloride penetrating that are considered in the model . the effect of environment that include temperature , relative humidity and cumulating of surface chloride concentration of concrete are also considered . moreover , chloride diffusion changing with time is included in this model as well as 模型中考虑水灰比和混凝土配合比(掺入不同量的粉煤灰和矿渣)变化对混凝土抵抗氯离子侵蚀能力的影响,同时考虑温度、相对湿度和表面氯离子浓度累积变化等环境因素对氯离子侵入混凝土过程的影响,以及氯离子扩散系数随时间的变化。 |
| 5. | ( 5 ) simplified calculation method without considering degradation of bond strength and response surface method using analysis output by fem is carried out to calculate the time - dependent reliability of corroded structure separately . the influence of chloride diffusion rate and steel corrosion ratio on structure reliability is discussed . the applicable scope and the calculation difference between the two methods are compared ( 5 )分别采用不考虑混凝土与锈蚀钢筋之间粘结力减弱的简化方法和利用非线性分析结果的响应面方法计算锈蚀钢筋混凝土结构的时变可靠度,研究了氯离子侵蚀速率、钢筋锈蚀率对结构可靠度的影响,并分析比较了这两种可靠度计算方法的适用范围和计算差异,为混凝土结构基于可靠度的耐久性鉴定提供了实用判别方法。 |
| 6. | They can be used to assess or predict the reliability of corroded and cracked r . c . structures in marine environment . the stochastic model for assessment of chloride concentration in concrete is built by analyzing the stochastic process of chloride diffusion in concrete and taking account of the time variation of the diffusion coefficient 通过分析氯离子在混凝土中扩散的随机过程,把扩散系数作为随时间变化的函数,将混凝土表面氯离子浓度、保护层厚度作为随机变量,建立了预测混凝土保护层中氯离子浓度分布的随机模型,推导出了氯离子浓度的均值和方差。 |
| 7. | Statistic relationship between water / cement ratio and chloride diffusion coefficient was gained by experiment , based on which the influence of concrete cover , water / cement ratio and design reference period on structural reliability was discussed . 2 . there are two models provided to predict remaining service life 通过试验确定了水灰比与氯离子扩散系数之间的统计关系,在此基础上分析了海洋环境下混凝土保护层厚度、水灰比、设计基准期等与耐久性有关的非承载力因素对设计基准期内结构可靠性的影响。 |
| 8. | 6 . the durability of concrete structures resisting chloride diffusion in different water cement ratio and different contents of fly ash and silica was analyzed and durable life was predicted based on the results of the test , which will be helpful to preparation of high performance concrete ( hpc ) as well as durability design and assessment of concrete structures 系统地研究了低水胶比及掺加粉煤灰、硅灰的高性能混凝土的电渗透性和氯离子扩散系数,分析了水胶比以及粉煤灰和硅灰等活性集料对混凝土结构抵抗氯离子侵蚀的耐久性能的影响,并对高性能混凝土结构抗氯离子侵蚀的耐久寿命进行了预测,为氯盐污染环境下高性能混凝土的配制以及混凝土结构耐久性评估与设计提供参考。 |
| 9. | In the aspect of mortar permeability the author has done some experiments , including the water absorption , porosity , weatherability , anti - freeze - thaw cycle , carbonation and the chloride diffusion experiment , and compared those properties with conventional mortar to testify the modified effects . on the base of these experiments , the method of sem was used to analyze the microstructure and hydration mechanism of polymer modified cement mortar , and the author draws a conclusion that the 9 percent of polymer - cement ratio is the optimum ratio 在改进砂浆的密实度和抗渗性能方面,主要进行了不同聚合物掺量下的吸水性试验、可透孔隙率试验、耐老化性试验、抗冻性试验、抗碳化试验,以及对耐久性能影响最大的快速氯离子扩散试验,并和普通砂浆的相应试验进行了对比分析,验证了聚合物砂浆的改性效果。 |
| 10. | On the basis of the theory of reinforcement corrosion caused by chloride , a chloride diffusion model considering the time - dependent quantities of diffusion coefficient and surface chloride concentration for predicting the content of chloride in concrete is presented in this paper , at the same time , the determination of model factors are analyzed 论文以氯离子对混凝土结构的侵蚀机理为基础,在不同氯腐蚀环境下,建立了考虑氯离子扩散系数的时间依赖性及其它因素影响的改进氯离子扩散模型,并对模型参数的选取和确定进行了深入讨论。 |