Currently, the physical and chemical properties of the ashes generated during combustion process are being tested, e.g., forest residues, the pulp and paper industry, sugar cane or corn cobs, and attempts are being made to develop methods for their management in various sectors of the economy. The results obtained by the authors of these studies confirm that the ashes produced in co-combustion processes have a higher reactivity and can be a useful raw material in the production of cement matrix materials. Mortars and concretes with the addition of such ash usually achieve similar or lower strength values after 28 days of maturation (75% of the control samples, 98вЂ“84%, 72вЂ“93%, 98вЂ“46% ), and after a longer period (90вЂ“180 days) they increase their compressive strength, ultimately achieving a strength similar to or higher than the control samples (2вЂ“20% higher than control samples, 5вЂ“12%. There have also been reports of the possibility of using fly ashes from the co-combustion of hard coal and biomass in conventional or fluidized bed boilers for this purpose. Concretes containing the addition of fly ash from biomass combustion do not have a negative environmental impact with respect to the leaching of heavy metal ions into the environment.

The addition of fly ash in the range of 10вЂ“30% causes a slight increase in the water absorption of concrete. The addition of fly ash reduces the extent to which the compression strength of concrete is lowered after low-temperature resistance tests by 22вЂ“82%. The 28-day compressive strength of concrete with fly ash increases with the amount of ash added (up to 30%), giving a strength 28% higher than the control concrete sample. The research shows that fly ash applied in an amount of 10вЂ“30% can be added as a sand substitute for the production of concrete, without reducing quality (compression strength and low-temperature resistance) compared to control concrete. This article analyses the possibility of using fly ash from the combustion of woodвЂ“sunflower biomass in a fluidized bed boiler as an additive to concrete.

Bricks n balls level 285