Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Durability of hydrated portland cement with copper slag addition in NaCl+Na2SO4 medium
The reactivity of hydrated portland cement pastes containing up to 30 % of a Spanish ground copper slag (CuGS) in an aggressive solution (Cl(-) and SO4(2-) has been studies in order to evaluate the changes in microstructural and mechanical properties of the composite material. Flexural strength data were related to microstructural parameters, studied by means of X-ray diffraction as well as porosity and pore-size distribution analyses. Based on the results, the following conclusions can be deduced: The unaggressivity of sulfate in the presence of chloride ions is due to the preferential diffusion process of Cl(-) and Na(+) ions versus sulfate ions. It seems that the high NaCl content in the pore solution activates the slag pozzolanic reactivity, leading to the formation of hydrated aluminates of layered structure which are subsequently transformed into Friedel's salt via OH(-)-Cl(-) ionic exchange inside the basal space. These processes decrease the porosity of the materials, thus increasing their flexural strengths.
Durability of hydrated portland cement with copper slag addition in NaCl+Na2SO4 medium
The reactivity of hydrated portland cement pastes containing up to 30 % of a Spanish ground copper slag (CuGS) in an aggressive solution (Cl(-) and SO4(2-) has been studies in order to evaluate the changes in microstructural and mechanical properties of the composite material. Flexural strength data were related to microstructural parameters, studied by means of X-ray diffraction as well as porosity and pore-size distribution analyses. Based on the results, the following conclusions can be deduced: The unaggressivity of sulfate in the presence of chloride ions is due to the preferential diffusion process of Cl(-) and Na(+) ions versus sulfate ions. It seems that the high NaCl content in the pore solution activates the slag pozzolanic reactivity, leading to the formation of hydrated aluminates of layered structure which are subsequently transformed into Friedel's salt via OH(-)-Cl(-) ionic exchange inside the basal space. These processes decrease the porosity of the materials, thus increasing their flexural strengths.
Durability of hydrated portland cement with copper slag addition in NaCl+Na2SO4 medium
Stabilität eines mit Kupferschlacke versetzten hydratisierten Portlandzements in NaCl und Na2SO4 enthaltenden Medien
Goni, S. (Autor:in) / Lorenzo, M.A. (Autor:in) / Sagrera, J.L. (Autor:in)
Cement and Concrete Research ; 24 ; 1403-1412
1994
10 Seiten, 4 Bilder, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
Durability of Hydrated Portland Cement with Copper Slag Addition in NaCl+Na2SO4 Medium
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