期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 212, 期 -, 页码 653-662出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.04.033
关键词
Cement paste; Mineral admixture; Carbonation curing; Compressive strength; Transport property; Microstructure
资金
- National Natural Science Foundation of China [51778188]
- Practical Technology Research and Development Program of Heilongjiang Province-China [GA16C103]
This paper aims to investigate the influences of limestone powder, fly ash and ground granulated blast-furnace slag (GGBS) on carbonation curing of cement pastes. These three mineral admixtures were incorporated at percentage of 20% by weight to replace cement and compressive strength and chloride ion permeability test were performed to evaluate the carbonation curing effects. On the other hand, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetry-differential thermal analysis (TG-DTA), mercury intrusion porosimeter (MIP) and scanning electron microscope (SEM) measurements were performed on typical samples. Experimental results show that the addition of mineral admixture decreased the compressive strength of uncarbonated specimens but strengthened the improvement effect of carbonation curing on compressive strength. This better improvement effect can partly compensate the decreasing strength induced by the incorporation of mineral admixtures. Among those mineral admixtures, fly ash exhibited the best improvement effect and GGBS ranked second. The chloride ion permeability of cement mortars were decreased by the addition of mineral admixtures but improved by the carbonation curing. The formation of CaCO3 upon carbonation curing refined the pore structure and presented a higher effectiveness for filling pores with diameters of 0.1 similar to 1 mu m. Therefore, carbonation curing provides a good method for both efficiently recycling industrial wastes as mineral admixtures and capturing more greenhouse gas. (C) 2019 Elsevier Ltd. All rights reserved.
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