A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Production of lightweight concrete using incinerator bottom ash
AbstractThe medium size fraction (14–40mm) of aged incinerator bottom ash (IBA) obtained from a major UK energy from waste (EfW) plant has been crushed to less than 5mm (CIBA) and thermally treated at 600°C (TCIBA6), 700°C (TCIBA7), 800°C (TCIBA8) and 900°C (TCIBA9). Thermal treatment reduced the organic carbon content and increased the amount of wollastonite (CaSiO3), mayenite (Ca12Al14O33) and gehlenite (Ca2Al2SiO7). The crushed and thermally treated IBA has been mixed with Portland cement (PC) at different water/solid (w/s) ratios and with different proportions of PC and Ca(OH)2. The volume expansion during setting and bulk densities and compressive strengths were determined. Expansion occurred in all mixes contained IBA during curing. A lightweight material (density less than 1.8g/cm3) with 28day compressive strength of higher than 10MPa was prepared by mixing 20wt% PC with 80wt% TCIBA8 at w/s ratio of 0.20. The expansion and associated lightweight properties result from gas evolution during curing due to residual metallic Al in the IBA. The main crystalline hydration products in 28day cured samples were portlandite (Ca(OH)2), calcite (CaCO3) and calcium aluminate carbonate hydrates (Ca4Al2O6(CO3)0.5·12H2O and Ca8Al4O14CO2·24H2O).
Production of lightweight concrete using incinerator bottom ash
AbstractThe medium size fraction (14–40mm) of aged incinerator bottom ash (IBA) obtained from a major UK energy from waste (EfW) plant has been crushed to less than 5mm (CIBA) and thermally treated at 600°C (TCIBA6), 700°C (TCIBA7), 800°C (TCIBA8) and 900°C (TCIBA9). Thermal treatment reduced the organic carbon content and increased the amount of wollastonite (CaSiO3), mayenite (Ca12Al14O33) and gehlenite (Ca2Al2SiO7). The crushed and thermally treated IBA has been mixed with Portland cement (PC) at different water/solid (w/s) ratios and with different proportions of PC and Ca(OH)2. The volume expansion during setting and bulk densities and compressive strengths were determined. Expansion occurred in all mixes contained IBA during curing. A lightweight material (density less than 1.8g/cm3) with 28day compressive strength of higher than 10MPa was prepared by mixing 20wt% PC with 80wt% TCIBA8 at w/s ratio of 0.20. The expansion and associated lightweight properties result from gas evolution during curing due to residual metallic Al in the IBA. The main crystalline hydration products in 28day cured samples were portlandite (Ca(OH)2), calcite (CaCO3) and calcium aluminate carbonate hydrates (Ca4Al2O6(CO3)0.5·12H2O and Ca8Al4O14CO2·24H2O).
Production of lightweight concrete using incinerator bottom ash
Qiao, X.C. (author) / Ng, B.R. (author) / Tyrer, M. (author) / Poon, C.S. (author) / Cheeseman, C.R. (author)
Construction and Building Materials ; 22 ; 473-480
2006-11-21
8 pages
Article (Journal)
Electronic Resource
English
Production of lightweight concrete using incinerator bottom ash
| British Library Online Contents | 2008
Production of lightweight concrete using incinerator bottom ash
| Online Contents | 2008
| British Library Online Contents | 2016