Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Lightweight concretes of activated metakaolin-fly ash binders, with blast furnace slag aggregates
AbstractThis work investigated geopolymeric lightweight concretes based on binders composed of metakaolin with 0% and 25% fly ash, activated with 15.2% of Na2O using sodium silicate of modulus SiO2/Na2O=1.2. Concretes of densities of 1200, 900 and 600kg/m3 were obtained by aeration by adding aluminium powder, in some formulations lightweight aggregate of blast furnace slag was added at a ratio binder:aggregate 1:1; curing was carried out at 20 and 75°C. The compressive and flexural strength development was monitored for up to 180days. The strength diminished with the reduction of the density and high temperature curing accelerated strength development. The use of the slag had a positive effect on strength for 1200kg/m3 concretes; reducing the amount of binder used. The thermal conductivity diminished from 1.65 to 0.47W/mK for densities from 1800 to 600kg/m3. The microstructures revealed dense cementitious matrices conformed of reaction products and unreacted metakaolin and fly ash. Energy dispersive spectroscopy and X-ray diffraction showed the formation of amorphous silicoaluminate reaction products.
Lightweight concretes of activated metakaolin-fly ash binders, with blast furnace slag aggregates
AbstractThis work investigated geopolymeric lightweight concretes based on binders composed of metakaolin with 0% and 25% fly ash, activated with 15.2% of Na2O using sodium silicate of modulus SiO2/Na2O=1.2. Concretes of densities of 1200, 900 and 600kg/m3 were obtained by aeration by adding aluminium powder, in some formulations lightweight aggregate of blast furnace slag was added at a ratio binder:aggregate 1:1; curing was carried out at 20 and 75°C. The compressive and flexural strength development was monitored for up to 180days. The strength diminished with the reduction of the density and high temperature curing accelerated strength development. The use of the slag had a positive effect on strength for 1200kg/m3 concretes; reducing the amount of binder used. The thermal conductivity diminished from 1.65 to 0.47W/mK for densities from 1800 to 600kg/m3. The microstructures revealed dense cementitious matrices conformed of reaction products and unreacted metakaolin and fly ash. Energy dispersive spectroscopy and X-ray diffraction showed the formation of amorphous silicoaluminate reaction products.
Lightweight concretes of activated metakaolin-fly ash binders, with blast furnace slag aggregates
Arellano Aguilar, R. (Autor:in) / Burciaga Díaz, O. (Autor:in) / Escalante García, J.I. (Autor:in)
Construction and Building Materials ; 24 ; 1166-1175
16.12.2009
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Lightweight concretes of activated metakaolin-fly ash binders, with blast furnace slag aggregates
| British Library Online Contents | 2010
Lightweight aggregates from blast furnace slag
| Engineering Index Backfile | 1951
| British Library Online Contents | 2012