Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
One Part Blast-Furnace Slag Cements Activated with a Blend of MgO-Na2SO4
In order to reduce the use of sodium silicate solutions and hydroxides for the alkaline activation of materials, the combination of alkaline activators has a positive effect to produce alternative cements with environmental advantages in relation to Portland cement-based materials. This research report results of compressive strength and reaction products of blast-furnace slag cements activated with a mixture of MgO-Na2SO4 with a ratio 1:1 added in 4, 6 and 8% relative to the slag weight. Pastes of alkali activated slag were prepared and cured at 20 ℃ and 60 ℃-24h-20 ℃ up to 90 days. Samples at 20 ℃ did not show a strength gain during the first 3 days of curing, but after 7 days the strength increased noticeably of up 53 MPa at 90 days. It also was observed that curing at 60 ℃ favored a gain of compressive strength at early ages between 20-30MPa with a marginal increase at 90 days. The use of the mix MgO-Na2SO4 was favorable for the chemical activation of the slag without detrimental effects on the stability of the formulated samples. The microstructures consisted of C-S-H, ettringite, hydrotalcite and some traces of CaCO3 from the raw material.
One Part Blast-Furnace Slag Cements Activated with a Blend of MgO-Na2SO4
In order to reduce the use of sodium silicate solutions and hydroxides for the alkaline activation of materials, the combination of alkaline activators has a positive effect to produce alternative cements with environmental advantages in relation to Portland cement-based materials. This research report results of compressive strength and reaction products of blast-furnace slag cements activated with a mixture of MgO-Na2SO4 with a ratio 1:1 added in 4, 6 and 8% relative to the slag weight. Pastes of alkali activated slag were prepared and cured at 20 ℃ and 60 ℃-24h-20 ℃ up to 90 days. Samples at 20 ℃ did not show a strength gain during the first 3 days of curing, but after 7 days the strength increased noticeably of up 53 MPa at 90 days. It also was observed that curing at 60 ℃ favored a gain of compressive strength at early ages between 20-30MPa with a marginal increase at 90 days. The use of the mix MgO-Na2SO4 was favorable for the chemical activation of the slag without detrimental effects on the stability of the formulated samples. The microstructures consisted of C-S-H, ettringite, hydrotalcite and some traces of CaCO3 from the raw material.
One Part Blast-Furnace Slag Cements Activated with a Blend of MgO-Na2SO4
RILEM Bookseries
Escalante-Garcia, J. Ivan (Herausgeber:in) / Castro Borges, Pedro (Herausgeber:in) / Duran-Herrera, Alejandro (Herausgeber:in) / Betancourt-Castillo, I. E. (Autor:in) / Díaz-Guillén, J. A. (Autor:in) / Escalante-García, J. I. (Autor:in) / Burciaga-Díaz, O. (Autor:in)
RILEM Annual Week ; 2021 ; Merida, Mexico
Proceedings of the 75th RILEM Annual Week 2021 ; Kapitel: 69 ; 640-647
RILEM Bookseries ; 40
11.03.2023
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
| Engineering Index Backfile | 1951
| Engineering Index Backfile | 1961
Characterisation of alkali-activated stainless steel slag and blast-furnace slag cements
| BASE | 2023
Characterisation of alkali-activated stainless steel slag and blast-furnace slag cements
| BASE | 2023
Investigation of Portland Blast-Furnace Slag Cements
| NTIS | 1956