| Popis: |
Wood biomass ash (WBA) presents a great potential for future appli-cations as supplementary cementitious material (SCM). Considering the variable chemical composition of WBA, the influence of free CaO and free MgO in ce- mentitious composites with WBA as SCM should also be investigated, as certain mechanical properties and durability of composites may be negatively affected. The influence of 10 different fly WBA from Croatian power plants, varied in proportions of 10, 20 and 30% as SCM, on standard consistency, initial and final setting time and volume stability of cement pastes was tested. The results show that during the transport of WBA there was carbonation and hydration of free CaO and MgO, which stabilized and partially influenced the volume stability and setting time of cement pastes, so the content of alkali, pozzolanic oxides and LOI should also be considered in the analysis. |
