Author(s)

Alexey Brykov, Mikhail Voronkov

Department of Chemical Technology of High-Melting Non-Metallic and Silicate Materials, Saint Petersburg State Institute of Technology, Saint Petersburg, Russia.

High-calcium fly ash (HCFA)—a residue of high-temperature coal combustion at thermal power plants, in combination with sodium carbonate presents an effective hardening activator of ground granulated blast-furnace slag (GGBFS). Substitution of 10% - 30% of GGBFS by HCFA and premixing of 1% - 3% Na2CO3 to this dry binary binder was discovered to give mortar compression strength of 10 - 30 to 30 - 45 MPa at 7 and 28 days when moist cured at ambient temperature. High-calcium fly ash produced from low-temperature combustion of fuel, like in circulating fluidized bed technology, reacts with water readily and is itself a good hardening activator for GGBFS, so introduction of Na₂CO₃ into such mix has no noticeable effect on the mortar strength. However, low-temperature HCFA has higher water demand, and the strength of mortar is compromised by this factor. As of today, our research is still ongoing, and we expect to publish more data on different aspects of durability of proposed GGBFS-HCFA binder later.

Ground Granulated Blast-Furnace Slag, Blast-Furnace Slag Activation, High-Calcium Fly-Ash, Sodium Carbonate, Blast-Furnace Slag Binder

Brykov, A. and Voronkov, M. (2023) Dry Mix Slag—High-Calcium Fly Ash Binder. Part One: Hydration and Mechanical Properties. Materials Sciences and Applications, 14, 240-254. doi: 10.4236/msa.2023.143014.