Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Properties, microstructure and hydration products of lightweight aggregate concrete with metakaolin and slag addition
Highlights MK is more efficient than slag on improvement of properties and durability of LWAC. Synergetic reaction of MK and slag improved properties and microstructure further. ITZ was improved through internal curing by pre-wetting of LWA. There is a linear correlation between strength and chloride diffusion coefficient.
Abstract The effects of metakaolin (MK) and slag on the strength, shrinkage, chloride resistance and interfacial transition zone microstructure of lightweight aggregate concrete were characterized by a range of analytical techniques. Slag decreased early age strength while MK increased late age strength, which was further increased by the combination of MK and slag. MK was more effective on reducing chloride diffusion coefficient and shrinkage than slag. These properties were further improved by the combination of MK and slag. Linear correlation was observed between strength and chloride diffusion coefficient with higher strength presenting lower diffusion coefficient. Portlandite, ettringite, hemicarboaluminate and monocarboaluminate were identified as hydration products. MK promoted the formation of hemicarboaluminate and monocarboaluminate. Portlandite content decreased at 28days in concrete with MK and slag, resulting in an interfacial transition zone with denser microstructure and lower Ca/Si ratio, due to the pozzolanic reaction.
Properties, microstructure and hydration products of lightweight aggregate concrete with metakaolin and slag addition
Highlights MK is more efficient than slag on improvement of properties and durability of LWAC. Synergetic reaction of MK and slag improved properties and microstructure further. ITZ was improved through internal curing by pre-wetting of LWA. There is a linear correlation between strength and chloride diffusion coefficient.
Abstract The effects of metakaolin (MK) and slag on the strength, shrinkage, chloride resistance and interfacial transition zone microstructure of lightweight aggregate concrete were characterized by a range of analytical techniques. Slag decreased early age strength while MK increased late age strength, which was further increased by the combination of MK and slag. MK was more effective on reducing chloride diffusion coefficient and shrinkage than slag. These properties were further improved by the combination of MK and slag. Linear correlation was observed between strength and chloride diffusion coefficient with higher strength presenting lower diffusion coefficient. Portlandite, ettringite, hemicarboaluminate and monocarboaluminate were identified as hydration products. MK promoted the formation of hemicarboaluminate and monocarboaluminate. Portlandite content decreased at 28days in concrete with MK and slag, resulting in an interfacial transition zone with denser microstructure and lower Ca/Si ratio, due to the pozzolanic reaction.
Properties, microstructure and hydration products of lightweight aggregate concrete with metakaolin and slag addition
Cheng, Shukai (Autor:in) / Shui, Zhonghe (Autor:in) / Li, Qiu (Autor:in) / Sun, Tao (Autor:in) / Yang, Ronghui (Autor:in)
Construction and Building Materials ; 127 ; 59-67
28.09.2016
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016