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Durability of green concrete in Severe Environment

Journal of Renewable Materials 2023年第4期11卷 1895-1910页

作者： Yonggan Yang Zihao Kang Binggen Zhan Peng Gao Qijun Yu Yanlai Xiong Jingfeng Wang Yunsheng Zhang School of Civil Engineering Hefei University of TechnologyHefei230009China Henan Key Laboratory of Materials on Deep-Earth Engineering Henan Polytechnic UniversityJiaozuo454000China Anhui Key Laboratory of Civil Engineering Structure and Materials Hefei University of TechnologyHefei230009China Hefei Cement Research and Design Institute Co. Ltd.Hefei230051China College of Civil Engineering Lanzhou University of TechnologyLanzhou730050China

In this paper,the effects of different mineral admixtures and sulfate solution types on the appearance,mass change rate,relative dynamic elastic modulus,and corrosion resistance coefficient of concrete were systematically studied.X-ray Diffraction(XRD),Mercury Intrusion Porosimetry(MIP),Scanning Electron Microscopy(SEM),and X-ray Computed Tomography(X-CT)were used to explore and analyze the changes in the microstructure and the corrosion products of concrete in the sulfate *** results show that the existence of magnesium ions accelerates concrete *** is a critical dosage of fly ash for magnesium sulfate resistance of *** magnesium sulfate resistance of concrete is improved when the fly ash content is less than 20%.Slag can significantly improve the corrosion resistance of concrete to magnesium *** diffusion of sulfate ions into concrete is a gradual *** the early stages of corrosion,sulfate ion content in the concrete immersed in the magnesium sulfate solution is slightly less than that of the concrete immersed in the sodium sulfate ***,in the later stage of corrosion,the sulfate ion content in the concrete immersed in the magnesium sulfate solution is significantly higher than that of the concrete immersed in the sodium sulfate solution.

关键词： green concrete sulfate attack deterioration law microstructure

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Effect of Alkaline Electrolyzed Water on Performance Improvement of green concrete with High Volume of Mineral Admixtures

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Journal of Renewable Materials 2021年第11期9卷 2051-2065页

作者： Guibin Liu Meinan Wang Qi Yu Qiuyi Li Liang Wang Center for Technological Development Qingdao Qingjian New Material Group Co.Ltd.Qingdao266108China College of Civil Engineering&Architecture Qingdao Agricultural UniversityQingdao266109China

The strength and durability of concrete will be significantly reduced at high volume of mineral admixture,and the poor early strength of concrete also still needs to be *** this investigation,a highly active alkaline electrolyzed waters was used as mixing water to improve the early strength and enhance the durability of green concrete with high volume mineral admixture,the influences of alkaline electrolyzed water(AEW)on hydration activity of mineral admixture and durability of concrete were *** results showed that compared with natural tap water,AEW can accelerate early hydration process of cement in concrete and produce comparatively more hydrated products,leading to a 13.6%higher compressive strength than that of ordinary concrete at early age,but the improvement effect of AEW concrete was relatively reduced at long-term ***,the activity of mineral admixtures could be stimulated by AEW to some extent,the strength and durability performance of AEW concrete after double doping 25%slag and 25%fly ash can still reach the level of ordinary cement concrete without mineral *** SEM micromorphology of 7 d hydrated natural tap water cement paste was observed to be flaky and tabular,but the AEW cement pastes present obvious cluster and granulation *** SEM microstructure of AEW concrete with mineral admixtures is more developed and denser than ordinary tap water concrete with mineral ***,the AEW probably could realize the effective utilization of about 50%mineral admixture amount of concrete without strength loss,the cement production cost and associated CO_(2) emission reduced,which has a good economic and environmental benefit.

关键词： Alkaline electrolyzed water durability improvement green concrete mineral admixture micromorphology

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Corrosion Performance of Stainless Steel Reinforcement in the concrete Prepared with Seawater and Coral Waste and Its Ecological Effects

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Journal of Renewable Materials 2020年第5期8卷 513-534页

作者： Xingguo Feng Yiji Zhang Xiangyu Lu Yiwen Xu Leyuan Zhang Chao Zhu Tong Wu Yashi Yang Xuhui Zhao Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security Hohai UniversityNanjing210098China State Key Laboratory of green Building Materials Beijing100024China Key Laboratory of Marine Materials and Related Technologies Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China College of Water Conservancy Engineering Wanjiang University of TechnologyMaanshan243000China School of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

Durability and ecological effects of the stainless steel reinforced coral waste concrete were compared with those of the carbon steel reinforced ordinary *** results showed that the corrosion current densities of the stainless steel in the coral waste concrete were less than one-tenth of those of the carbon steel in the same grade ordinary *** stainless steel in the seawater coral waste concrete maintained passivation even after more than two years of immersion in 3.5%NaCl solution,while the carbon steel counterparts in the ordinary concrete were seriously corroded under the same ***,the corrosion current density of the stainless steel reinforcement decreased slightly with the strength grade of the coral waste *** ecological evaluation indicated that the non-renewable energy consumption and CO_(2)emission of per cubic meter of the newly constructed stainless steel reinforced coral waste concrete were 23.72%and 1.419%less than those of the carbon steel reinforced ordinary concrete with the same grade,while the aforementioned two parameters of the former material were reduced by 44.81%and 32.0%in comparison to the latter one in 50 years duration.

关键词： Coral waste stainless steel seawater green concrete corrosion

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Partial Replacement of Cement by Solid Wastes as New Materials for green Sustainable Construction Applications

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Journal of Building Material Science 2021年第2期3卷 8-12页

作者： Hosam M.Saleh Abeer A.Faheim Aida A.Salman Abeer M.El-Sayed Radioisotope Department Nuclear Research CenterAtomic Energy Egyptian Atomic Energy AuthorityCairoEgypt Chemistry Department Faculty of ScienceAl Azhar UniversityEgypt

The manufacturing of ordinary Portland cement is an energy-intensive process that results in pollution and CO2 emissions,among other *** is a need for an environmentally friendly green concrete *** products from a variety of sectors can be recycled and used as a green concrete *** decreases the environmental effects of concrete manufacturing as well as energy *** use of solid waste materials for green building is extremely important now and in the *** concrete is also in its infancy in terms of manufacturing and *** must intervene by encouraging business *** aim of this review paper is to raise awareness about the importance of repurposing recycled materials and to highlight new technologies for producing green,sustainable concrete.

关键词： Construction materials Sustainable composites green concrete Solid wastes

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