Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
High performance cement composites with colloidal nano-silica
https://orcid.org/0000-0002-3801-637X
https://orcid.org/0000-0002-3767-2295
Highlights This paper first reports the influence of nano-silica on high strength mortar. Pore system was refined and more disconnected. Compressive strength and transport properties were improved. Drying shrinkage was reduced due to the refined microstructure. The enhancing efficiency was compared in high strength and normal strength mortar.
Abstract Recent studies have demonstrated the advantages of using nano-silica in building materials such as concrete due to its nano-filler effect as well as the pozzolanic reaction. However, most of the previous findings are based on normal strength cement composites. In this study, a wide range of properties of high performance cement composites are investigated with addition of colloidal nano-silica (CNS) at dosage of 0.5%, 1.0%, 1.5% and 2.0%. Attributed to the pozzolanic reaction of CNS, the microstructures are denser and more homogenous. SEM observation, accelerated hydration rate and reduced Portlandite content verify this beneficial reaction. Hence, the CNS can help produce cement composites with higher mechanical strength and better durability regards to the impermeability to water and chloride ions. Also, it is found that the influence of CNS is more pronounced for composites with lower water-cement ratio at 0.30, in comparison with those at 0.50.
High performance cement composites with colloidal nano-silica
https://orcid.org/0000-0002-3801-637X
https://orcid.org/0000-0002-3767-2295
Highlights This paper first reports the influence of nano-silica on high strength mortar. Pore system was refined and more disconnected. Compressive strength and transport properties were improved. Drying shrinkage was reduced due to the refined microstructure. The enhancing efficiency was compared in high strength and normal strength mortar.
Abstract Recent studies have demonstrated the advantages of using nano-silica in building materials such as concrete due to its nano-filler effect as well as the pozzolanic reaction. However, most of the previous findings are based on normal strength cement composites. In this study, a wide range of properties of high performance cement composites are investigated with addition of colloidal nano-silica (CNS) at dosage of 0.5%, 1.0%, 1.5% and 2.0%. Attributed to the pozzolanic reaction of CNS, the microstructures are denser and more homogenous. SEM observation, accelerated hydration rate and reduced Portlandite content verify this beneficial reaction. Hence, the CNS can help produce cement composites with higher mechanical strength and better durability regards to the impermeability to water and chloride ions. Also, it is found that the influence of CNS is more pronounced for composites with lower water-cement ratio at 0.30, in comparison with those at 0.50.
High performance cement composites with colloidal nano-silica
https://orcid.org/0000-0002-3801-637X
https://orcid.org/0000-0002-3767-2295
Highlights This paper first reports the influence of nano-silica on high strength mortar. Pore system was refined and more disconnected. Compressive strength and transport properties were improved. Drying shrinkage was reduced due to the refined microstructure. The enhancing efficiency was compared in high strength and normal strength mortar.
Abstract Recent studies have demonstrated the advantages of using nano-silica in building materials such as concrete due to its nano-filler effect as well as the pozzolanic reaction. However, most of the previous findings are based on normal strength cement composites. In this study, a wide range of properties of high performance cement composites are investigated with addition of colloidal nano-silica (CNS) at dosage of 0.5%, 1.0%, 1.5% and 2.0%. Attributed to the pozzolanic reaction of CNS, the microstructures are denser and more homogenous. SEM observation, accelerated hydration rate and reduced Portlandite content verify this beneficial reaction. Hence, the CNS can help produce cement composites with higher mechanical strength and better durability regards to the impermeability to water and chloride ions. Also, it is found that the influence of CNS is more pronounced for composites with lower water-cement ratio at 0.30, in comparison with those at 0.50.
High performance cement composites with colloidal nano-silica
Du, Hongjian (Autor:in) / Pang, Sze Dai (Autor:in)
Construction and Building Materials ; 224 ; 317-325
06.07.2019
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch