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Compressive behavior and microstructure of concrete mixed with natural seawater and sea sand

Frontiers of Structural and Civil Engineering 2021年第6期15卷 1347-1357页

作者： Qinghai XIE Jianzhuang XIAO Kaijian ZHANG Zhongling ZONG Department of Structural Engineering Tongji UniversityShanghai 200092China School of Civil and Ocean Engineering Jiangsu Ocean UniversityLianyungang 222005China

Noncorrosive reinforcement materials facilitate producing structural concrete with seawater and sea *** study investigated the properties of seawater and sea sand concrete(SSC),considering the curing age(3,7,14,21,28,60,and 150 d)and strength grade(C30,C40,and C60).The compressive behavior of SSC was obtained by compressive tests and digital image correction(DIC)*** electron microscope(SEM)and X-ray powder diffraction(XRD)methods were applied to understand the microstructure and hydration products of cement in *** revealed a 30%decrease in compressive strength for C30 and C40 SSC from 60 to 150 d,and a less than 5%decrease for C60 from 28 to 150 *** results revealed significant cracking and crushing from 80%to 100%of compressive *** images showed a more compact microstructure in higher strength *** patterns identified Friedel’s salt phase due to the chlorides brought by seawater and sea *** findings in this study can provide more insights into the microstructure of SSC along with its short-and long-term compressive behavior.

关键词： seawater and sea sand concrete compressive strength strain field microstructure hydration products

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Durability evaluation of GFRP rebars in harsh alkaline environment using optimized tree-based random forest model

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Journal of Ocean Engineering and Science 2022年第6期7卷 596-606页

作者： Mudassir Iqbal Daxu Zhang Fazal E.Jalal State Key Laboratory of Ocean Engineering Shanghai Key Laboratory for Digital Maintenance of Buildings and InfrastructureSchool of Naval ArchitectureOcean&Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Civil Engineering University of Engineering and Technology PeshawarPakistan

GFRP bars reinforced in submerged or moist seawater and ocean concrete is subjected to highly alkaline *** investigating the durability of GFRP bars in alkaline environment,the effect of surrounding temperature and conditioning duration on tensile strength retention(TSR)of GFRP bars is well investigated with laboratory aging of GFRP ***,the role of variable bar size and volume fraction of fiber have been poorly ***,various structural codes recommend the use of an additional environmental reduction factor to accurately reflect the long-term performance of GFRP bars in harsh *** study presents the development of Random Forest(RF)regression model to predict the TSR of laboratory conditioned bars in alkaline environment based on a reliable database comprising 772 tested *** model was optimized,trained,and validated using variety of statistical checks available in the *** developed RF model was used for the sensitivity and parametric ***,the formulated RF model was used for studying the long-term performance of GFRP rebars in the alkaline concrete *** sensitivity analysis exhibited that temperature and pH are among the most influential attributes in TSR,followed by volume fraction of fibers,duration of conditioning,and diameter of the bars,*** bars with larger diameter and high-volume fraction of fibers are less susceptible to degradation in contrast to the small diameter bars and relatively low fiber’s volume ***,the long-term performance revealed that the existing recommendations by various codes regarding environmental reduction factors are conservative and therefore needs revision accordingly.

关键词： GFRP seawater and sea sand concrete Durability Mechanical properties Degradation

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