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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low carbon and high efficiency limestone-calcined clay as supplementary cementitious materials (SCMs): Multi-indicator comparison with conventional SCMs
Graphical abstract Display Omitted
Highlights Multi-indicator of LC2 and conventional SCMs blended cement were studied. Evaluation indexes related to energy consumption and carbon emission were proposed. LC2 is superior to conventional SCMs in many aspects. LC2 shows excellent low-carbon and high-efficiency features.
Abstract The increasing shortage of conventional supplementary cementitious materials, including fly ash (FA) and ground granulated blast furnace slag (GGBS), further obliterates the sustainability potential of Portland cement. Fortunately, recent studies have proved that limestone-calcined clay (LC2) is a feasible substitute. In this study, LC2 was used as SCM to study the properties of blended cement, and compared with FA and GGBS, the relevant mechanisms leading to the unique properties of LC2 were also explained. The evaluation indexes related to energy consumption and carbon emission were proposed. Results show that, contrary to the positive effects of FA and GGBS, LC2 has a negative effect on normal consistency and workability. LC2 slightly shorten the setting time at normal consistency, but at large content, the setting time was significantly prolonged due to the increase of consistency. LC2 diminished drying shrinkage and is superior to FA and GGBS. LC2 has higher cementing efficiency than FA and GGBS, and it is more obvious at early age. The environmental impact analysis also showed that LC2 reduced the relative energy consumption and carbon emission of cement, and reduces by about half at the substitution rate of 45 ∼ 60%.
Low carbon and high efficiency limestone-calcined clay as supplementary cementitious materials (SCMs): Multi-indicator comparison with conventional SCMs
Graphical abstract Display Omitted
Highlights Multi-indicator of LC2 and conventional SCMs blended cement were studied. Evaluation indexes related to energy consumption and carbon emission were proposed. LC2 is superior to conventional SCMs in many aspects. LC2 shows excellent low-carbon and high-efficiency features.
Abstract The increasing shortage of conventional supplementary cementitious materials, including fly ash (FA) and ground granulated blast furnace slag (GGBS), further obliterates the sustainability potential of Portland cement. Fortunately, recent studies have proved that limestone-calcined clay (LC2) is a feasible substitute. In this study, LC2 was used as SCM to study the properties of blended cement, and compared with FA and GGBS, the relevant mechanisms leading to the unique properties of LC2 were also explained. The evaluation indexes related to energy consumption and carbon emission were proposed. Results show that, contrary to the positive effects of FA and GGBS, LC2 has a negative effect on normal consistency and workability. LC2 slightly shorten the setting time at normal consistency, but at large content, the setting time was significantly prolonged due to the increase of consistency. LC2 diminished drying shrinkage and is superior to FA and GGBS. LC2 has higher cementing efficiency than FA and GGBS, and it is more obvious at early age. The environmental impact analysis also showed that LC2 reduced the relative energy consumption and carbon emission of cement, and reduces by about half at the substitution rate of 45 ∼ 60%.
Low carbon and high efficiency limestone-calcined clay as supplementary cementitious materials (SCMs): Multi-indicator comparison with conventional SCMs
Zhu, Haitang (Autor:in) / Chen, Weige (Autor:in) / Cheng, Shengzhao (Autor:in) / Yang, Lin (Autor:in) / Wang, Shuo (Autor:in) / Xiong, Jianglin (Autor:in)
02.05.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
C-A-S-H , calcium-alumino-silicate-hydrate , CEF , Cementing Efficiency Factor , C-S-H , calcium-silicate-hydrate , EE , Embodied Energy , GGBS , Ground Granulated Blast Furnace Slag , LP , Limestone Powder , RECI , Relative Embodied Carbon Index , SCMs , Supplementary Cementitious Materials , CC , Calcined Clay , CH , Portlandite or calcium hydroxide , EC , Embodied Carbon , FA , Fly Ash , LC2 , Limestone Calcined Clay , PC , Portland Cement , REEI , Relative Embodied Energy Index , Blended cement , Supplementary cementitious materials , Cementing efficiency , Embodied energy , Embodied carbon
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