Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental investigation of utilizing waste flue gas desulfurized gypsum as backfill materials
https://orcid.org/0000-0003-0832-3624
https://orcid.org/0000-0001-8551-0082
Highlights Using a high a large volume of FGDG as backfill materials was feasible. A ratio of FGDG-WFA mixtures used for field construction was recommended. Strength, water stability and volume stability of the mixtures were evaluated. The compaction effect and settlement were assessed through field tests.
Abstract Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another waste material from the power plant. To alleviate the accompanying environmental issues, large-volume utilizations such as in civil engineering applications are usually adopted to consume these materials. However, these materials cannot achieve high strength due to the lack of amorphous content. In this study, combined with WFA, a large volume of waste FGDG was investigated for the utilizations as backfill materials. With using two types of activators, sodium hydroxide and water glass, in small doses, mixtures with various ratios of FGDG and WFA were included to investigate the mechanical, chemical, microscopic, and softening properties at different curing periods. Then the field experiments including the dynamic cone penetration test and the load plate test were conducted to evaluate the bearing capacity, settlement and compaction effect of the compacted mixtures. The experimental results showed that the NaOH activated mixture (FGDG: WFA = 50:50) could acquire acceptable mechanical properties for backfill applications, which can serve as a practical option for the large-volume utilization of FGDG and WFA.
Experimental investigation of utilizing waste flue gas desulfurized gypsum as backfill materials
https://orcid.org/0000-0003-0832-3624
https://orcid.org/0000-0001-8551-0082
Highlights Using a high a large volume of FGDG as backfill materials was feasible. A ratio of FGDG-WFA mixtures used for field construction was recommended. Strength, water stability and volume stability of the mixtures were evaluated. The compaction effect and settlement were assessed through field tests.
Abstract Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another waste material from the power plant. To alleviate the accompanying environmental issues, large-volume utilizations such as in civil engineering applications are usually adopted to consume these materials. However, these materials cannot achieve high strength due to the lack of amorphous content. In this study, combined with WFA, a large volume of waste FGDG was investigated for the utilizations as backfill materials. With using two types of activators, sodium hydroxide and water glass, in small doses, mixtures with various ratios of FGDG and WFA were included to investigate the mechanical, chemical, microscopic, and softening properties at different curing periods. Then the field experiments including the dynamic cone penetration test and the load plate test were conducted to evaluate the bearing capacity, settlement and compaction effect of the compacted mixtures. The experimental results showed that the NaOH activated mixture (FGDG: WFA = 50:50) could acquire acceptable mechanical properties for backfill applications, which can serve as a practical option for the large-volume utilization of FGDG and WFA.
Experimental investigation of utilizing waste flue gas desulfurized gypsum as backfill materials
https://orcid.org/0000-0003-0832-3624
https://orcid.org/0000-0001-8551-0082
Highlights Using a high a large volume of FGDG as backfill materials was feasible. A ratio of FGDG-WFA mixtures used for field construction was recommended. Strength, water stability and volume stability of the mixtures were evaluated. The compaction effect and settlement were assessed through field tests.
Abstract Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another waste material from the power plant. To alleviate the accompanying environmental issues, large-volume utilizations such as in civil engineering applications are usually adopted to consume these materials. However, these materials cannot achieve high strength due to the lack of amorphous content. In this study, combined with WFA, a large volume of waste FGDG was investigated for the utilizations as backfill materials. With using two types of activators, sodium hydroxide and water glass, in small doses, mixtures with various ratios of FGDG and WFA were included to investigate the mechanical, chemical, microscopic, and softening properties at different curing periods. Then the field experiments including the dynamic cone penetration test and the load plate test were conducted to evaluate the bearing capacity, settlement and compaction effect of the compacted mixtures. The experimental results showed that the NaOH activated mixture (FGDG: WFA = 50:50) could acquire acceptable mechanical properties for backfill applications, which can serve as a practical option for the large-volume utilization of FGDG and WFA.
Experimental investigation of utilizing waste flue gas desulfurized gypsum as backfill materials
Ma, Yuetan (Autor:in) / Nie, Qingke (Autor:in) / Xiao, Rui (Autor:in) / Hu, Wei (Autor:in) / Han, Bingye (Autor:in) / Polaczyk, Pawel Andrzej (Autor:in) / Huang, Baoshan (Autor:in)
09.02.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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