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Effect of treatment process on consolidation efficiency of fugitive dust cemented by bio-activated cementitious material based on CO2 capture

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Abstract

As a new green and environmental material, bio-activated cementitious material is attracting extensive attention. This study confirmed that the bio-activated cementitious material could mineralize and cement fugitive dust into the calcite- consolidation-layer based on CO2 capture and utilization. The results illustrated that treatment processes (non-pressure spraying, pressure spraying, non-pressure blending and pressure blending) had a strong effect on the microstructure and properties of calcite-consolidation-layer. According to the analysis of X-ray diffraction (XRD) and Fourier transform infrared (FTIR), calcite was prepared by bio-activated cementitious material during the cementation process. Meanwhile, scanning electron microscopy (SEM) and thermogravimetric-differential scanning calorimetry (TG-DSC) were adopted to measure the corresponding variation of porous characteristics and calcite content caused by different treatment processes. The results indicated that the microstructure of calcite-consolidation-layer from the spraying process had lower porosity and higher content of calcite than from blending processes. In addition, the mechanical properties of calcite-consolidation-layer were also tested. The hardness and compressive strength, which reached 19.5 GPa and 0.6 MPa, respectively, of calcite-consolidation-layer from the pressure spraying process were higher than those from the other three treatment processes. Compared with the non-treatment process, the four treatment processes had superior wind erosion resistance. Under the wind speed of 12 m/s, the mass loss of calcite-consolidation-layer from the pressure spraying process decreased from 2150.2 to 23.8 g/(m2 h).

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Correspondence to ChunXiang Qian.

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Zhan, Q., Qian, C. Effect of treatment process on consolidation efficiency of fugitive dust cemented by bio-activated cementitious material based on CO2 capture. Sci. China Technol. Sci. 59, 1194–1200 (2016). https://doi.org/10.1007/s11431-016-6065-7

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  • DOI: https://doi.org/10.1007/s11431-016-6065-7

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