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durability of concrete under Multi-damage Action

Journal of Wuhan University of Technology(Materials Science) 2004年第2期19卷 73-75页

作者：赵霄龙 Huazhong University of Science and Technology

Several different experiments,including freezing-thawing,freezing-thawing+drying-wetting,and drying-wetting,in salt solution and in water respectively,were designed to determine the durability of *** durability damage features of concrete in the above experiments were *** is demonstrated that the damage extent of concrete under freezing-thawing and freezing-thawing+drying-wetting in salt solution is larger than that in ***,freezing-thawing and freezing-thawing+drying-wetting in salt solution are stricter and more effective methods to evaluate the durability of concrete in salt-existing environment in cold *** damage extent of concrete under freezing-thawing+drying-wetting shows an ultra-superposition *** order of concrete durability deterioration degree in these experiments is *** shows that effects of multi-damage factors are greater than those of single-damage factor.

关键词： durability of concrete multi-damage factors freezing-thawing drying-wetting

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Modeling Boundary and Edge Effect of Chloride Diffusion for durability Design of concrete Structures Exposed in Marine Environment

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1112-1117页

作者： ZHOU Xingang LI Kefei CHEN Zhaoyuan Department of Civil Engineering Tsinghua University School of Civil Engineering Yantai University

According to the Fick＇s second law of diffusion, six analytical solutions of chloride profile in concrete were studied and discussed with regard to different boundary and initial conditions. In those analytical solutions, the most prevailing error-function solution which is based on semi-infinite assumption is the simple one, but may under-estimate the chloride content in concrete and over-rate the life time prediction of concrete structures. The experimental results show that compared with other solutions, the chloride content in concrete predicted by error-function model is the minimum, and the calculation difference produced by different analytical models should not be ignored. The influence of models on chloride content prediction is more than other environment and material coefficients in some time. In order to get a more realistic prediction model, modification to error-function model is suggested based on analysis and calculation examples concerning the boundary and edge effect.

关键词： durability of concrete marine environment durability design and life prediction error-function model model modification

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durability of Seawater Mixed concrete with Different Replacement Ratio of BFS （Blast Furnace Slag） and FA （Fly Ash）

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Journal of Civil Engineering and Architecture 2016年第5期10卷 568-580页

作者： Nobuaki Otsuki Aung Kyaw Min Tomohiro Nagata Cheng Yi Department of International Development Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan Civil Engineering Unit Chiyoda Corporation Yokohama 230-0077 Japan

Using seawater in concrete can be considered as one of the sustainable approaches in construction industry not only to save the freshwater resource but also to promote the use of abandoned seawater resource, especially in the construction at the uninhabited area close to the sea where the procurement of fresh water is difficult. In this study, durability against chloride attack of seawater mixed concrete with different replacement ratio of BFS （blast furnace slag） and FA （fly ash） is discussed and the life time until the occurrence of corrosion crack is evaluated. The results show that：（1） Chloride penetration rate of seawater mixed specimens with BFS and FA is lower than that of freshwater mixed OPC （ordinary Portland cement） specimens; （2） Oxygen permeability of seawater mixed specimens with BFS and FA is almost the same or lower than that of freshwater mixed OPC specimens; （3） Total life time （corrosion incubation period and propagation period） of seawater mixed specimens with BFS and FA is almost the same or only slightly shorter than that of freshwater mixed OPC specimens. From the results, it was confirmed that the usage of seawater in concrete mixing is feasible in concrete with the appropriate BFS and FA replacement ratio.

关键词： Seawater chloride attack corrosion durability of concrete blast furnace slag fly ash.

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Resistance to acid degradation,sorptivity,and setting time of geopolymer mortars

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Frontiers of Structural and Civil Engineering 2022年第6期16卷 781-791页

作者： Osama A MOHAMED Rania AL-KHATTAB Waddah AL-HAWAT College of Engineering Abu Dhabi UniversityAbu DhabiUnited Arab Emirates

Experimental evaluations were conducted to determine the water sorptivity,setting time,and resistance to a highly acidic environment,of mortar with alkali-activated ground granulated blast furnace slag(GBS)binder and also of combinations of fly ash and GBS *** were activated using mixtures of NaOH and Na_(2)SiO_(3)*** molarity of NaOH in the mixtures ranged from 10 mol·L^(−1)to 16 mol·L^(−1),and the Na_(2)SiO_(3)/NaOH ratio was varied from 1.5 to *** samples were produced using three binder combinations:1)GBS as the only binder;2)blended binder with a slag-to-fly ash ratio of 3:1;and 3)mixed binder with 1:1 ratio of slag to fly *** samples were mixed and cured at(22±2)°C till the day of the *** impact of activator solution alkalinity,activator ratio Na_(2)SiO_(3)/NaOH,GBS content on the rate of water absorption were *** 7,28,and 90 d of immersion in a 10%sulfuric acid solution,the resistance of a geopolymer matrix to degradation was assessed by measuring the change in sample *** influence of solution alkalinity and relative fly ash content on setting times was ***-activated mortar with a slag-to-fly ash ratio of 3:1 had the least sorptivity compared to the two other binder combinations,at each curing age,and for mortars made with each of the NaOH alkaline activator *** sorptivity decreased with age and sodium hydroxide concentrations,suggesting the production of geopolymerization *** reduction in weight of sample occurred after immersion in the strong acid H_(2)SO_(4)solution for three months,regardless of binder *** was due to the synthesis of hydration and geopolymerization products in the presence of curing water,which outweighed the degradation of the geopolymer matrix caused by sulfuric acid.

关键词： alkali-activated materials fly ash sorptivity durability of concrete sodium hydroxide sodium silicates reduction in CO_(2)emissions sulfuric acid

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刚性及柔性表面涂层对砼耐久性影响的对比研究

刚性及柔性表面涂层对砼耐久性影响的对比研究

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第六届全国高强与高性能混凝土学术交流会

作者：郑敏升高庆强张尉福建省建筑科学研究院福建省建筑科学研究院福建省建筑科学研究院

＜正＞造成混凝土耐久性劣化的主要原因依次排列为钢筋锈蚀、冻融循环、碱—骨料反应以及硫酸盐侵蚀等方面。以上几种原因里,膨胀和开裂的原因都与水有关,同时水也是侵蚀性介质（如氯盐、硫酸盐等）扩散进入混凝土体内的载体。*** 提出... 详细信息

＜正＞造成混凝土耐久性劣化的主要原因依次排列为钢筋锈蚀、冻融循环、碱—骨料反应以及硫酸盐侵蚀等方面。以上几种原因里,膨胀和开裂的原因都与水有关,同时水也是侵蚀性介质（如氯盐、硫酸盐等）扩散进入混凝土体内的载体。*** 提出过一种概括混凝土劣化的两阶段损伤模型,即第一阶段为砼损伤的潜伏期,第二阶段为砼损伤后在环境作

关键词： rigid external coat flexible extemal coat durability of concrete aging

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