期刊
MATERIALS
卷 14, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/ma14112883
关键词
soda residue; ground granulated blast furnace slag; alkali activation; microstructure; hydration products; chloride binding; cement paste
类别
资金
- Science and Technology Project Foundation of Hebei Province, China [16273809]
This study investigated the effects of different mass ratios of SR-activated GGBFS cementitious materials on their physical properties, mechanical strength, and chloride binding capacity. Results showed that adding 16% SR can achieve maximum compressive strength, while increasing SR addition led to decreased density and increased porosity of the pastes.
Soda residue (SR), an industrial solid waste, pollutes the environment due to its high alkalinity and chloride ion content. SR can be used as an alkali activator of ground granulated blast furnace slag (GGBFS). This study investigated the effects of four types of SR-activated GGBFS cementitious materials (pastes) with different mass ratios of SR to GGBFS (8:92, 16:84, 24:76, 34:68) on the physical properties, mechanical strength, and chloride binding capacity. The hydration mechanism of the pastes was also studied. Results showed that with the increasing addition of SR, the density of the pastes decreased, and more white aggregates of SR appeared causing the increase of water absorption and porosity of the pastes. The pastes with 16% SR addition had the maximum compressive strength (34.1 MPa, 28 d), so the optimum proportion of SR addition in the pastes was 16%. With the increases of SR addition, the amount of chloride element in the initial pastes increases. When the proportion of SR addition is 8%, the mass percentage of free chloride ion in the pastes at 28 d is 0.13%. The main hydration products of the pastes were C-S-H gels, ettringite, and Friedel's salt, and the amount of ettringite varied with the amount of SR addition and curing time.
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