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PHYSICAL PROPERTIES AND ENVIRONMENTAL PERFORMANCE OF STEAM-CURED CONCRETE CONTAINING FLUE-GAS DESULFURIZATION GYPSUM

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Journal of Green Building 2021年第1期16卷 3-15页

作者： hongseok jang Seungyoung So Joenbuk National University Department of Architectural EngineeringKorea. Joenbuk National University Department of Architectural EngineeringResearch Center of Industrial TechnologyKorea

Flue-gas desulfurization(FGD)gypsum has occasionally been used as an additive to ***,appropriate facilities are required to ensure the environmen-tally safe processing of FGD gypsum and the resulting cement material *** facilities are yet to be developed because the amount of FGD gypsum used is still small when compared with the vast amounts of FGD gypsum *** this study,we analyze the effect of FGD gypsum addition on the physical properties,stabilization,and radon count of steam-cured mortar and compare its performance with air-cured *** results show that the steam-cured pozzolanic hydration products of ettringite and C-S-H promote the densification of the mortar structure,thereby resulting in nanopore size reduction and increased strength of FGD gypsum mortar subsequent to the steam-cured hydration ***,our environmental test results indicate that steam-cured pozzolanic materials composed of FGD gypsum are environmentally safer than air-cured cementitious materials.

关键词： FGD gypsum nanopores leaching toxicity recycled material

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CHARACTERISTICS OF SLAG ACTIVATED PHC-PILE WITH REDUCED CEMENT CONTENT

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Journal of Green Building 2020年第4期15卷 117-129页

作者： hongseok jang Seungyoung So Jeonbuk National University Department of Architectural EngineeringKorea Jeonbuk National University Department of Architectural EngineeringResearch Center of Industrial TechnologyKorea

Ground Granulated Blast-furnace Slag(GGBS)powders,the massive by-products produced in the process of manufacturing cast iron are actively used as a substitute for cement,one of the major causes of greenhouse gas *** purpose of this study was to investigate the proper mixing ratio of the activator,and to reduce the usage of cement in the production of high-strength steam cured concrete using *** cured products of various ratio were analyzed by XRD and TG/DTA,and the best ratio of the cured product were applied to the Pre-stressed high-strength con-crete(PHC)Pile,and the performance was then *** results showed that the fluidity was improved by mixing with GGBS,and when an appropriate amount of activator was used,it was possible to produce high-strength cured *** the PHC-Pile test,the replacement rate of 40%GGBS and combined 4%anhydrite gypsum and 2%Ca(OH)2 as an activator was *** compressive strength(2MPa more),shear strength(1.3MPa more),and Axial force strength(2.7Mpa more)were more improved than for the normal Portland cement PHC-Pile,and this GGBS pile can be manufactured more economically(the cost can be saved in the amount of 14.5%).This is caused by the activating agent destroying the glassy film of the GGBS,and actively inducing the pozzolanic reaction,so that the hydrate materi-als are generated,such as *** addition,by positively utilizing the inexpensive industrial by-product,GGBS,it is possible to manufacture environmentally friendly concrete products,while reducing the amount of cement used.

关键词： Earthen construction material By-products recycling PHC-Pile Substitution cement

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EFFECT OF YELLOW LOESS ON ODOROUS GAS ADSORPTION AND ECOTOXICITY TEST USING DAPHNIA MAGNA

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Journal of Green Building 2021年第1期16卷 103-114页

作者： hongseok jang Boram Lee Seungyoung So Jeonbuk National University Department of Architectural EngineeringKorea. Jeonbuk National University Department of Architectural EngineeringResearch Center of Industrial TechnologyKorea

To minimize damage caused by harmful substances released from artificial construc-tion materials,there has been increasing interest in eco-friendly houses constructed with natural *** natural materials,yellow loess is South Korea’s most representative eco-friendly construction material,with high purification performance for indoor ***,there has been no objective assessment of yellow loess’s performance at purifying indoor *** this study,internal pores were found in yellow loess that were of a lamellar crystal structure consisting of bonds of silica and alumina plates,and there was a high negative charge on the loess surface;these might have contributed to the excellent performance of yellow loess in adsorbing odorous *** was also an exposure test using Daphnia magna to determine the eco-friendliness of yellow loess compared with that of cement *** showed the survival of Daphnia magna was longer in the indoor environment of a test chamber with higher concentration of ammonia wherein yellow loess was ***50(median effective concentration,the concentration that caused death of 50%of bio-specimens)value of 19 ml of ammonia(0.1%solution),which was three times more than EC50 value of 6 ml of ammonia of the same area of cement mortar.

关键词： eco-friendly material yellow loess Daphnia magna evaluation CEC gas adsorption

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