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Durability of Concrete with Different Improvement Measures and Its Ser-vice Life Prediction in Island and Reef Environment

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China Ocean Engineering 2022年第6期36卷 947-958页

作者： GONG Wei YU Hong-fa MA Hai-yan WANG Nan ZHU Hai-wei School of Civil Engineering and Architecture Jiangsu University of Science and TechnologyZhenjiang 212100China Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Engineering University of Science and Technology LiaoningAnshan 114051China Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications CCCC Forth Harbor Engineering Institute Co.Ltd.Guangzhou 510230China

To solve the durability of island and reef concrete engineering in the harsh environment of high temperature,high salt,high humidity and windy,the strength grade of concrete and the type of corrosion inhibitor were used as the influence factors,while the relative dynamic elastic modulus was used as the evaluation *** addition,the law and time variability of the deterioration of concrete,the size effect,environmental similarity and the service life model were *** results showed that improving the strength grade of concrete could improve the durability of concrete,and corrosion inhibitor could slightly improve the durability of ***-varying law of the deterioration of concrete conformed to the univariate quadratic *** with the concrete damage equivalent theory,a size effect model based on the relative dynamic elastic modulus was proposed and verified,and the size effect coefficient was also *** environmental similarity model between simulated and practical island and reef environment was *** with the reliability theory and the first order second moment method,a new service life model of concrete structure was *** authors were convinced that the research will be advantageous to researchers.

关键词： island and reef environment relative dynamic elastic modulus size effect environmental similarity service life model

Service Life Design for Concrete Engineering in Marine Environments of Northern China Based on a Modified Theoretical Model of Chloride Diffusion and Large Datasets of Ocean Parameters

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Engineering 2022年第10期17卷 123-139页

作者： Taotao Feng Hongfa Yu Yongshan Tan Haiyan Ma Mei Xu Chengjun Yue Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Materials Science and Engineering Southeast UniversityNanjing 211189China College of Civil Science and Engineering Yangzhou UniversityYangzhou 225127China

In this study,through experimental research and an investigation on large datasets of the durability parameters in ocean engineering,the values,ranges,and types of distribution of the durability parameters employed for the durability design in ocean engineering in northern China were *** on a modified theoretical model of chloride diffusion and the reliability theory,the service lives of concrete structures exposed to the splash,tidal,and underwater zones were *** concrete proportions meeting the requirement of a service life of 100 or 120 years were designed,and a cover thickness requirement was *** addition,the effects of the different time-varying relationships of the boundary condition(Cs)and diffusion coefficient(Df)on the service life were compared;the results showed that the time-varying relationships used in this study(i.e.,Cscontinuously increased and then remained stable,and Dfcontinuously decreased and then remained stable)were beneficial for the durability design of concrete structures in marine environment.

关键词： Large datasets Modified theoretical model Reliability theory Service life Boundary condition Diffusion coefficient

Experimental and mesoscopic investigation on the dynamic properties of coral aggregate concrete in compression

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Science China(Technological Sciences) 2021年第6期64卷 1153-1166页

作者： WU Zhang Yu ZHANG JinHua YU HongFa FANG Qin CHEN Li YUE ChengJun Department of Civil and Airport Engineering Civil Aviation CollegeNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Engineering Southeast UniversityNanjing 210096China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education(ERCSPEIME) Southeast UniversityNanjing 211189China Department of Civil Engineering Army Engineering University of PLANanjing 210007China

To investigate the dynamic responses and comprehending the damage mechanism of coral aggregate concrete(CAC) in compression, both the experimental and numerical investigations were implemented in the present work. Firstly, the dynamic mechanical properties of CAC at different strain rates were tested through the Split-Hopkinson pressure bar(SHPB) ***, the effects of concrete strength grade and strain rate on CAC were discussed and analyzed. Subsequently, we developed the three-dimensional(3D) random mesoscale model considering the randomness of aggregate shape, size and distribution at meso-level, which was validated and employed in the numerical simulation of CAC in compression. The results indicate that the splitting failure passing through the coral aggregate is CAC’S primary failure mode. It has been found that the failure pattern, deformation process, and dynamic increasing factor of CAC are associated with both the strain rate and concrete strength grade. Furthermore, by comparing the experimental and mesoscopic results, it has been proven to be reliable to employ the developed 3D mesoscale modelling method to simulate CAC’s dynamic performances, which has enormous potential in future research of CAC under intense dynamic loadings.

关键词： coral aggregate concrete 3D mesoscopic modelling SHPB strain rate DIF

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不同珊瑚骨料对珊瑚混凝土力学性能的影响

硅酸盐学报 2020年第11期48卷 1771-1780页

作者：苏晨麻海燕余红发岳承军张亚栋梅其泉沙海洋刘婷南京航空航天大学土木与机场工程系南京211106 江苏省机场基础设施安全工程研究中心南京211106 东南大学土木工程学院南京211189

研究了经冲刷的鹿角状珊瑚、轻质珊瑚礁和重质珊瑚礁作为粗骨料对珊瑚混凝土力学性能的影响。结果表明:鹿角状骨料对珊瑚混凝土立方体和棱柱体抗压强度的提高作用最显著,其次是重质珊瑚礁骨料,最后是轻质珊瑚礁骨料;珊瑚混凝土90d与28d... 详细信息

研究了经冲刷的鹿角状珊瑚、轻质珊瑚礁和重质珊瑚礁作为粗骨料对珊瑚混凝土力学性能的影响。结果表明:鹿角状骨料对珊瑚混凝土立方体和棱柱体抗压强度的提高作用最显著,其次是重质珊瑚礁骨料,最后是轻质珊瑚礁骨料;珊瑚混凝土90d与28d立方体抗压强度具有正相关性,棱柱体抗压强度随立方体抗压强度增大而线性增大,与骨料种类无关;珊瑚混凝土棱柱体峰值应变随峰值应力增大而对数增大,应力–应变曲线方程以及棱柱体的受压破坏形态都不受珊瑚骨料种类的影响。

关键词：珊瑚混凝土珊瑚骨料强度破坏形态应力–应变关系

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珊瑚混凝土骨料-净浆界面区强度

建筑材料学报 2021年第3期24卷 516-524页

作者：刁益彤麻海燕余红发张丽芳华实南京航空航天大学民航学院江苏南京210016 江苏省机场基础设施安全工程研究中心江苏南京210016 绿城乐居建设管理集团有限公司浙江杭州310000

采用纳米压痕和劈裂试验方法,研究了珊瑚骨料与水泥净浆界面试件在不同养护龄期的纳米压痕弹性模量、纳米压痕硬度、界面黏结劈拉强度、水泥净浆抗压强度和劈拉强度,以及它们之间的相关性.结果表明:与普通混凝土类似,珊瑚混凝土存在薄... 详细信息

采用纳米压痕和劈裂试验方法,研究了珊瑚骨料与水泥净浆界面试件在不同养护龄期的纳米压痕弹性模量、纳米压痕硬度、界面黏结劈拉强度、水泥净浆抗压强度和劈拉强度,以及它们之间的相关性.结果表明:与普通混凝土类似,珊瑚混凝土存在薄弱的界面过渡区(ITZ),内掺10%珊瑚微粉能够强化珊瑚骨料水泥净浆界面的宏观和纳米力学性能,界面黏结劈拉强度不仅与水泥净浆抗压强度、劈拉强度间存在显著线性关系,还与ITZ、水泥净浆基体的纳米力学性能有显著相关性.

关键词：珊瑚混凝土界面过渡区抗压强度纳米压痕劈拉强度

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环渤海湾海洋混凝土结构的长寿命研究与分析

建筑材料学报 2023年第8期26卷 897-905页

作者：麻海燕宋姗姗余红发孙悦锋徐彧南京航空航天大学土木与机场工程系江苏南京211106 中交一航局三公司辽宁大连116083 南京高等职业技术学校江苏南京210019

以环渤海湾海洋工程混凝土结构耐久性作为研究对象,根据多年来积累的实验室、海洋暴露站和工程实测数据,采用ChaDuraLife V1.0混凝土结构寿命预测模型与计算机软件,分析不同矿物掺合料掺量、水胶比对海洋混凝土结构服役寿命的影响规律.... 详细信息

以环渤海湾海洋工程混凝土结构耐久性作为研究对象,根据多年来积累的实验室、海洋暴露站和工程实测数据,采用ChaDuraLife V1.0混凝土结构寿命预测模型与计算机软件,分析不同矿物掺合料掺量、水胶比对海洋混凝土结构服役寿命的影响规律.结果表明:降低水胶比,提高粉煤灰掺量和磨细矿渣掺量都能有效延长海洋混凝土结构的预期服役寿命.以环渤海湾海洋浪溅区混凝土结构为例,最长服役寿命所对应的海洋混凝土配合比最优参数是:粉煤灰和磨细矿渣掺量分别为20%、40%,水胶比为0.30,混凝土结构满足100、200、500 a寿命所需最小保护层厚度分别为60、75、120 mm.

关键词：海洋混凝土结构耐久性设计保护层厚度矿物掺合料水胶比

同方期刊数据库

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全珊瑚海水混凝土静动态力学性能与数值模拟

建筑材料学报 2023年第11期26卷 1158-1165页

作者：麻海燕余红发郭建博梅其泉刘婷南京航空航天大学民航学院江苏南京211106 三江学院土木工程学院江苏南京210012

采用试验和三维随机骨料细观模型,研究了全珊瑚海水混凝土(CASC)在高温前后的静动态力学性能、抗侵彻和防爆性能.结果表明:添加剑麻纤维能有效改善CASC的脆性;随着温度的提高,CASC的残余抗压强度先增后减;经历高温后CASC的静动态力学性... 详细信息

采用试验和三维随机骨料细观模型,研究了全珊瑚海水混凝土(CASC)在高温前后的静动态力学性能、抗侵彻和防爆性能.结果表明:添加剑麻纤维能有效改善CASC的脆性;随着温度的提高,CASC的残余抗压强度先增后减;经历高温后CASC的静动态力学性能明显降低,温度越高,高温弱化效应越明显.提出了描述CASC高温后受压应力-应变关系的两段式方程.建立了一种适用于CASC的三维随机骨料细观模型,数值模拟结果与试验结果较为吻合.

关键词：全珊瑚海水混凝土准静态力学性能动态力学性能应变率效应数值模拟

全珊瑚海水混凝土冲击压缩性能试验研究与数值模拟

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建筑材料学报 2021年第2期24卷 283-290页

作者：岳承军余红发麻海燕梅其泉刘婷南京航空航天大学民航学院江苏南京211100

采用直径为75 mm的霍普金森压杆对强度等级为C30和C50的全珊瑚海水混凝土(CASC)以及剑麻纤维增强全珊瑚海水混凝土(SFCASC)进行了冲击压缩试验,并使用LS-DYNA软件对CASC的冲击性能进行了模拟.结果表明:CASC与SFCASC的动态增强因子DIF与... 详细信息

采用直径为75 mm的霍普金森压杆对强度等级为C30和C50的全珊瑚海水混凝土(CASC)以及剑麻纤维增强全珊瑚海水混凝土(SFCASC)进行了冲击压缩试验,并使用LS-DYNA软件对CASC的冲击性能进行了模拟.结果表明:CASC与SFCASC的动态增强因子DIF与应变率ε·s、立方体抗压强度f cu有关,建立了DIF关于ε·s与f cu的二元函数模型;通过试件的破坏形态分析可知剑麻纤维能够有效增强CASC的抗冲击性能,当应变率为52.4 s^(-1)时,CASC-C50试件破坏较为严重,而SFCASC-C50试件在应变率为56.9 s^(-1)时仍能保持完整的形态,只在边缘处出现少量裂缝;采用LS-DYNA软件对CASC-50的冲击压缩过程进行数值模拟,通过试验数据确定了HJC模型参数,模拟的动态抗压强度与试验值的误差在1.0%~4.9%,模拟动态临界应变与试验值的误差在4.3%~18.3%.

关键词：全珊瑚海水混凝土霍普金森压杆剑麻纤维应变率效应数值模拟

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碱式硫酸镁水泥混凝土的冲击压缩性能

建筑材料学报 2021年第3期24卷 562-570页

作者：刘婷麻海燕吴彰钰余红发张锦华南京航空航天大学民航学院江苏南京211106 东南大学土木工程学院江苏南京211189

采用∅75 mm分离式霍普金森压杆测试了碱式硫酸镁水泥混凝土(BMSCC)的力学性能,并借助Ls-Dyna软件和Holmquist-Johnson-Cook(HJC)模型,模拟了BMSCC的动态冲击力学响应.结果表明:BMSCC是典型的率相关性材料,具有明显的应变率增强效应,其... 详细信息

采用∅75 mm分离式霍普金森压杆测试了碱式硫酸镁水泥混凝土(BMSCC)的力学性能,并借助Ls-Dyna软件和Holmquist-Johnson-Cook(HJC)模型,模拟了BMSCC的动态冲击力学响应.结果表明:BMSCC是典型的率相关性材料,具有明显的应变率增强效应,其冲击压缩强度随着应变率的提高而增大,动态增强因子与应变率的对数呈线性关系.通过数值模拟确定了HJC模型的21个参数,其中冲击压缩强度和峰值应变的模拟相对误差分别为-3.9%~0.9%和-10.0%~3.2%,模拟效果较好.

关键词：碱式硫酸镁水泥混凝土分离式霍普金森压杆应变率效应动态增强因子数值模拟