The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform

Li Choung Chiang - One of the best experts on this subject based on the ideXlab platform.

  • replacement of raw mix in cement production by municipal solid waste incineration ash
    Cement and Concrete Research, 2003
    Co-Authors: Ph Shih, Juu En Chang, Li Choung Chiang
    Abstract:

    This study investigates the feasibility of using municipal solid waste incineration (MSWI) ash as a replacement of raw mix in cement production. Results show that sieving, self-grinding, and magnet separation processes are necessary to remove the debris, salt, and metallic contents that exist in the MSWI ash. By using the pretreated MSWI ashes, the produced cement specimens were in compliance with the unconfined compression strength (UCS) standard in Taiwan at a small replacement percentage of under 5%. When ash replacement percentage is more than 10%, the strength development of specimens is hindered due to the deficient formation of the calcium silicate. Calculation on Lime Saturation Factor also shows a descending trend in consequence of the increase in replacement percentage. Thus, compositional effect should be taken into consideration for promoting the calcium silicate formation in the case of large ash replacement. In this research, adjustment of chemical composition was achieved by adding 183 g calcium oxide per kilogram of cement raw mixture with 15% ash replacement. After adjustment, the produced cement could develop seven- and fivefold increase on UCS compared with those without calcium oxide supplement at 3 and 7 days of curing, respectively. These results indicate that, under a well-conditioned situation, MSWI ash is suitable for reuse in cement production.

  • replacement of raw mix in cement production by municipal solid waste incineration ash
    Cement and Concrete Research, 2003
    Co-Authors: Ph Shih, Juu En Chang, Li Choung Chiang
    Abstract:

    The feasibility of municipal solid waste incineration (MSWI) ash utilized as the replacement of raw mix in cement production is investigated. Result shows that sieving, self-grinding, and magnet separation processes are necessary to remove the debris, salt, and metallic contents that existed in the MSWI ash. By using the pretreated MSWI ashes, the produced cement specimens were in compliance with the unconfined compression strength (UCS) standard in Taiwan at small replacement percentage (<5%). When ash replacement percentage is large (more than 10%), the strength development of specimens would be hindered due to the deficient formation of the calcium silicate. Calculation on Lime Saturation Factor (LSF) also shows a descending trend in consequence of the increase in replacement percentage. Thus, compositional effect should be taken into consideration for promoting the calcium silicate formation at the case of large ash replacement. In this research, adjustment of chemical composition was achieved by adding 183 g calcium oxide per kilogram of cement raw mixture with 15% ash replacement. After adjustment, the produced cement could develop seven- and fivefold increase on UCS compared with those without calcium oxide supplement at 3 and 7 days of curing, respectively. Results concluded that the MSWI ash was suitable in reuse for cement production under a well-conditioned situation.

G N Angelopoulos - One of the best experts on this subject based on the ideXlab platform.

  • valorisation of electric arc furnace steel slag as raw material for low energy belite cements
    Journal of Hazardous Materials, 2011
    Co-Authors: Remus Ion Iacobescu, D Koumpouri, Yiannis Pontikes, R Saban, G N Angelopoulos
    Abstract:

    Abstract In this paper, the valorisation of electric arc furnace steel slag (EAFS) in the production of low energy belite cements is studied. Three types of clinkers were prepared with 0 wt.% (BC), 5 wt.% (BC5) and 10 wt.% (BC10) EAFS, respectively. The design of the raw mixes was based on the compositional indices Lime Saturation Factor (LSF), alumina ratio (AR) and silica ratio (SR). The clinkering temperature was studied for the range 1280–1400 °C; firing was performed at 1380 °C based on the results regarding free Lime and the evolution of microstructure. In order to activate the belite, clinkers were cooled fast by blown air and concurrent crushing. The results demonstrate that the microstructure of the produced clinkers is dominated by belite and alite crystals, with tricalcium aluminate and tetracalcium-alumino-ferrite present as micro-crystalline interstitial phases. The prepared cements presented low early strength development as expected for belite-rich compositions; however the 28-day results were 47.5 MPa, 46.6 MPa and 42.8 MPa for BC, BC5 and BC10, respectively. These values are comparable with OPC CEMI 32.5 N (32.5–52.5 MPa) according to EN 197-1. A fast setting behaviour was also observed, particularly in the case of BC10, whereas soundness did not exceed 1 mm.

  • Valorisation of electric arc furnace steel slag as raw material for low energy belite cements
    'Elsevier BV', 2011
    Co-Authors: Iacobescu, Remus Ion, Koumpouri Dimitra, Pontikes Yiannis, Saban Rami, G N Angelopoulos
    Abstract:

    In this paper, the valorisation of electric arc furnace steel slag (EAFS) in the production of low energy belite cements is studied. Three types of clinkers were prepared with 0 wt.% (BC), 5 wt.% (BC5) and 10 wt.% (BC10) EAFS, respectively. The design of the raw mixes was based on the compositional indices Lime Saturation Factor (LSF), alumina ratio (AR) and silica ratio (SR). The clinkering temperature was studied for the range 1280–1400°C; firing was performed at 1380°C based on the results regarding free Lime and the evolution of microstructure. In order to activate the belite, clinkers were cooled fast by blown air and concurrent crushing. The results demonstrate that the microstructure of the produced clinkers is dominated by belite and alite crystals, with tricalcium aluminate and tetracalcium-alumino-ferrite present as micro-crystalline interstitial phases. The prepared cements presented low early strength development as expected for belite-rich compositions; however the 28-day results were 47.5 MPa, 46.6 MPa and 42.8 MPa for BC, BC5 and BC10, respectively. These values are comparable with OPC CEMI 32.5 N (32.5–52.5 MPa) according to EN 197-1. A fast setting behaviour was also observed, particularly in the case of BC10, whereas soundness did not exceed 1 mm.status: publishe

Ph Shih - One of the best experts on this subject based on the ideXlab platform.

  • replacement of raw mix in cement production by municipal solid waste incineration ash
    Cement and Concrete Research, 2003
    Co-Authors: Ph Shih, Juu En Chang, Li Choung Chiang
    Abstract:

    This study investigates the feasibility of using municipal solid waste incineration (MSWI) ash as a replacement of raw mix in cement production. Results show that sieving, self-grinding, and magnet separation processes are necessary to remove the debris, salt, and metallic contents that exist in the MSWI ash. By using the pretreated MSWI ashes, the produced cement specimens were in compliance with the unconfined compression strength (UCS) standard in Taiwan at a small replacement percentage of under 5%. When ash replacement percentage is more than 10%, the strength development of specimens is hindered due to the deficient formation of the calcium silicate. Calculation on Lime Saturation Factor also shows a descending trend in consequence of the increase in replacement percentage. Thus, compositional effect should be taken into consideration for promoting the calcium silicate formation in the case of large ash replacement. In this research, adjustment of chemical composition was achieved by adding 183 g calcium oxide per kilogram of cement raw mixture with 15% ash replacement. After adjustment, the produced cement could develop seven- and fivefold increase on UCS compared with those without calcium oxide supplement at 3 and 7 days of curing, respectively. These results indicate that, under a well-conditioned situation, MSWI ash is suitable for reuse in cement production.

  • replacement of raw mix in cement production by municipal solid waste incineration ash
    Cement and Concrete Research, 2003
    Co-Authors: Ph Shih, Juu En Chang, Li Choung Chiang
    Abstract:

    The feasibility of municipal solid waste incineration (MSWI) ash utilized as the replacement of raw mix in cement production is investigated. Result shows that sieving, self-grinding, and magnet separation processes are necessary to remove the debris, salt, and metallic contents that existed in the MSWI ash. By using the pretreated MSWI ashes, the produced cement specimens were in compliance with the unconfined compression strength (UCS) standard in Taiwan at small replacement percentage (<5%). When ash replacement percentage is large (more than 10%), the strength development of specimens would be hindered due to the deficient formation of the calcium silicate. Calculation on Lime Saturation Factor (LSF) also shows a descending trend in consequence of the increase in replacement percentage. Thus, compositional effect should be taken into consideration for promoting the calcium silicate formation at the case of large ash replacement. In this research, adjustment of chemical composition was achieved by adding 183 g calcium oxide per kilogram of cement raw mixture with 15% ash replacement. After adjustment, the produced cement could develop seven- and fivefold increase on UCS compared with those without calcium oxide supplement at 3 and 7 days of curing, respectively. Results concluded that the MSWI ash was suitable in reuse for cement production under a well-conditioned situation.

Juu En Chang - One of the best experts on this subject based on the ideXlab platform.

  • replacement of raw mix in cement production by municipal solid waste incineration ash
    Cement and Concrete Research, 2003
    Co-Authors: Ph Shih, Juu En Chang, Li Choung Chiang
    Abstract:

    This study investigates the feasibility of using municipal solid waste incineration (MSWI) ash as a replacement of raw mix in cement production. Results show that sieving, self-grinding, and magnet separation processes are necessary to remove the debris, salt, and metallic contents that exist in the MSWI ash. By using the pretreated MSWI ashes, the produced cement specimens were in compliance with the unconfined compression strength (UCS) standard in Taiwan at a small replacement percentage of under 5%. When ash replacement percentage is more than 10%, the strength development of specimens is hindered due to the deficient formation of the calcium silicate. Calculation on Lime Saturation Factor also shows a descending trend in consequence of the increase in replacement percentage. Thus, compositional effect should be taken into consideration for promoting the calcium silicate formation in the case of large ash replacement. In this research, adjustment of chemical composition was achieved by adding 183 g calcium oxide per kilogram of cement raw mixture with 15% ash replacement. After adjustment, the produced cement could develop seven- and fivefold increase on UCS compared with those without calcium oxide supplement at 3 and 7 days of curing, respectively. These results indicate that, under a well-conditioned situation, MSWI ash is suitable for reuse in cement production.

  • replacement of raw mix in cement production by municipal solid waste incineration ash
    Cement and Concrete Research, 2003
    Co-Authors: Ph Shih, Juu En Chang, Li Choung Chiang
    Abstract:

    The feasibility of municipal solid waste incineration (MSWI) ash utilized as the replacement of raw mix in cement production is investigated. Result shows that sieving, self-grinding, and magnet separation processes are necessary to remove the debris, salt, and metallic contents that existed in the MSWI ash. By using the pretreated MSWI ashes, the produced cement specimens were in compliance with the unconfined compression strength (UCS) standard in Taiwan at small replacement percentage (<5%). When ash replacement percentage is large (more than 10%), the strength development of specimens would be hindered due to the deficient formation of the calcium silicate. Calculation on Lime Saturation Factor (LSF) also shows a descending trend in consequence of the increase in replacement percentage. Thus, compositional effect should be taken into consideration for promoting the calcium silicate formation at the case of large ash replacement. In this research, adjustment of chemical composition was achieved by adding 183 g calcium oxide per kilogram of cement raw mixture with 15% ash replacement. After adjustment, the produced cement could develop seven- and fivefold increase on UCS compared with those without calcium oxide supplement at 3 and 7 days of curing, respectively. Results concluded that the MSWI ash was suitable in reuse for cement production under a well-conditioned situation.

Remus Ion Iacobescu - One of the best experts on this subject based on the ideXlab platform.

  • valorisation of electric arc furnace steel slag as raw material for low energy belite cements
    Journal of Hazardous Materials, 2011
    Co-Authors: Remus Ion Iacobescu, D Koumpouri, Yiannis Pontikes, R Saban, G N Angelopoulos
    Abstract:

    Abstract In this paper, the valorisation of electric arc furnace steel slag (EAFS) in the production of low energy belite cements is studied. Three types of clinkers were prepared with 0 wt.% (BC), 5 wt.% (BC5) and 10 wt.% (BC10) EAFS, respectively. The design of the raw mixes was based on the compositional indices Lime Saturation Factor (LSF), alumina ratio (AR) and silica ratio (SR). The clinkering temperature was studied for the range 1280–1400 °C; firing was performed at 1380 °C based on the results regarding free Lime and the evolution of microstructure. In order to activate the belite, clinkers were cooled fast by blown air and concurrent crushing. The results demonstrate that the microstructure of the produced clinkers is dominated by belite and alite crystals, with tricalcium aluminate and tetracalcium-alumino-ferrite present as micro-crystalline interstitial phases. The prepared cements presented low early strength development as expected for belite-rich compositions; however the 28-day results were 47.5 MPa, 46.6 MPa and 42.8 MPa for BC, BC5 and BC10, respectively. These values are comparable with OPC CEMI 32.5 N (32.5–52.5 MPa) according to EN 197-1. A fast setting behaviour was also observed, particularly in the case of BC10, whereas soundness did not exceed 1 mm.