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Modified blended limestone-Portland cement binders: Evaluation of 4 different sodium silicates
Abstract One-part blended cements with 65% limestone and 35% Portland cement (PC) were activated by 3–8%wt. of four powdered sodium silicates of different modulus SiO2/Na2O = 1–3.26. Pastes were cured at 20 °C for 180 days in dry and underwater conditions. The use of moduli <3.26 promoted quick setting and low strength of the pastes. The use of modulus = 3.26 showed the best results in terms of workability, underwater stability and compressive strength higher than a reference non-activated blend; the evolution of pH, rate of heat liberation and setting times were similar among the activated and non-activated blend, indicating that the hydration of PC was not strongly altered by the activator and that other favorable reactions took place. Microstructural characterization showed that the developed strength was favored by reactions of the sodium silicate with portlandite from the Portland cement and limestone, as well as by the condensation of C–S–H and silica gel.
Highlights Blends of 65% limestone-35% Portland cement were activated with 4 sodium silicates. The binders had low water demand, high workability, fast setting and water stability. Sodium silicates of higher modulus are preferable due to the condensation of silica gel. Sodium silicate of modulus 3.26 improved the strength over the non activated cement. Limestone reacted with the alkalis and enhanced the reactions of the Portland cement.
Modified blended limestone-Portland cement binders: Evaluation of 4 different sodium silicates
Abstract One-part blended cements with 65% limestone and 35% Portland cement (PC) were activated by 3–8%wt. of four powdered sodium silicates of different modulus SiO2/Na2O = 1–3.26. Pastes were cured at 20 °C for 180 days in dry and underwater conditions. The use of moduli <3.26 promoted quick setting and low strength of the pastes. The use of modulus = 3.26 showed the best results in terms of workability, underwater stability and compressive strength higher than a reference non-activated blend; the evolution of pH, rate of heat liberation and setting times were similar among the activated and non-activated blend, indicating that the hydration of PC was not strongly altered by the activator and that other favorable reactions took place. Microstructural characterization showed that the developed strength was favored by reactions of the sodium silicate with portlandite from the Portland cement and limestone, as well as by the condensation of C–S–H and silica gel.
Highlights Blends of 65% limestone-35% Portland cement were activated with 4 sodium silicates. The binders had low water demand, high workability, fast setting and water stability. Sodium silicates of higher modulus are preferable due to the condensation of silica gel. Sodium silicate of modulus 3.26 improved the strength over the non activated cement. Limestone reacted with the alkalis and enhanced the reactions of the Portland cement.
Modified blended limestone-Portland cement binders: Evaluation of 4 different sodium silicates
Santana-Carrillo, J.L. (author) / Ortega-Zavala, D.E. (author) / Burciaga-Díaz, O. (author) / Escalante-Garcia, J.I. (author)
2021-01-05
Article (Journal)
Electronic Resource
English
Blended Limestone-Portland Cement Binders with Low Amounts of 2 Powdered Sodium Silicates
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