A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Blended Limestone-Portland Cement Binders with Low Amounts of 2 Powdered Sodium Silicates
The effect of the addition of 2 sodium silicates of modulus = 3.2, one commercial powdered sodium silicate (CSS) and one prepared on the base of waste glass-based (WGSS), was evaluated on limestone-Portland cement binders. An experimental design of three components mixture was used to formulate mortars with water/binder = 0.46, 2–20 wt.% CSS and 10–70% of Portland cement (PC); while for WGSS was used in a mortar with 40%PC, water/binder = 0.25. The aggregate/binder was kept at 2.75. The silicates were compared among similar mortar formulations in terms of compressive strength, flowability, microstructure and CO2 emissions. The CSS had a positive effect on the strength of mortars made with binders with 10 and 40%PC, but not in those with 70%PC. The flowability of all mortars was of about 130 mm and the use of low amounts of alkaline sodium silicates did not affect the performance of the superplasticizer (added at 0.05% wt. Relative to the mass of the binder). The performance of mortars prepared with WGSS was better than those with CSS; the former reached 40 MPa at 28 days, which was similar to reference 100%CP mortar. The irregular particles of WGSS had a better interaction with the cementitious matrix compared to the spherical particles of the CSS. On the other hand, emissions of the mortar with WGSS was 30% and 40% lower than mortars with CSS and the reference with PC, respectively. Overall, the use of the WGSS in mortars with low water/binder and 40%PC showed similar performance and lower environmental impact compared to the use of 100%PC mortars.
Blended Limestone-Portland Cement Binders with Low Amounts of 2 Powdered Sodium Silicates
The effect of the addition of 2 sodium silicates of modulus = 3.2, one commercial powdered sodium silicate (CSS) and one prepared on the base of waste glass-based (WGSS), was evaluated on limestone-Portland cement binders. An experimental design of three components mixture was used to formulate mortars with water/binder = 0.46, 2–20 wt.% CSS and 10–70% of Portland cement (PC); while for WGSS was used in a mortar with 40%PC, water/binder = 0.25. The aggregate/binder was kept at 2.75. The silicates were compared among similar mortar formulations in terms of compressive strength, flowability, microstructure and CO2 emissions. The CSS had a positive effect on the strength of mortars made with binders with 10 and 40%PC, but not in those with 70%PC. The flowability of all mortars was of about 130 mm and the use of low amounts of alkaline sodium silicates did not affect the performance of the superplasticizer (added at 0.05% wt. Relative to the mass of the binder). The performance of mortars prepared with WGSS was better than those with CSS; the former reached 40 MPa at 28 days, which was similar to reference 100%CP mortar. The irregular particles of WGSS had a better interaction with the cementitious matrix compared to the spherical particles of the CSS. On the other hand, emissions of the mortar with WGSS was 30% and 40% lower than mortars with CSS and the reference with PC, respectively. Overall, the use of the WGSS in mortars with low water/binder and 40%PC showed similar performance and lower environmental impact compared to the use of 100%PC mortars.
Blended Limestone-Portland Cement Binders with Low Amounts of 2 Powdered Sodium Silicates
RILEM Bookseries
Escalante-Garcia, J. Ivan (editor) / Castro Borges, Pedro (editor) / Duran-Herrera, Alejandro (editor) / Santana-Carrillo, José Luis (author) / Burciaga-Díaz, Oswaldo (author) / Escalante-García, J. Iván (author)
RILEM Annual Week ; 2021 ; Merida, Mexico
Proceedings of the 75th RILEM Annual Week 2021 ; Chapter: 70 ; 648-655
RILEM Bookseries ; 40
2023-03-11
8 pages
Article/Chapter (Book)
Electronic Resource
English
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