Use of DTA in the investigations of fly ashes from fluidized bed boilers

Investigations of the influence of different fly ashes on cement hydration

“…The so-called delayed formation and crystallization of ettringite may be accompanied by expansion of cement paste and in consequence durability of composite may decrease. The phenomenon of delayed ettringite formation in cement pastes admixtured with fly ash was observed by the authors of work [2]. In case of PF and PP fly ashes the presence of CaSO 4 and CaO in their composition may be important.…”

“…Research works concerning fly ashes in cement systems are made in several directions in which one may specify the investigation of: • cement hydration in the presence of different ashes and in changeable conditions (different types of applied cement, water/cement ratio, hardening condition, etc.) whose example are works [2][3][4]; • influence of ash presence on properties of fresh concrete or mortar cement mixtures and on properties of final composites (for example in works [5,6]); • fly ash activation (e.g. [7,8]);…”

Sewage sludge conditioning with the application of ash from biomass-fired power plant

“…Additionally, the centrifugation of conditioned sewage sludge was more efficient in comparison with raw sewage sludge, as witnesses by the liquid volume after dewatering. The water volume was approximately 27 cm 3 for raw sewage sludge and in the range of 31÷34 cm 3 (2000 rpm) and 32÷34 cm 3 (2500 rpm) for conditioned sewage sludge in different dosages of ash (Fig. 6).…”

“…The sewage sludge conditioning was carried out as follows: five beakers with a volume of 1 dm 3 were filled with 500 cm 3 of raw sewage sludge. To four beakers with sludge, there are applied appropriate dosages of biomass ash: 5; 7.5; 15 and 30 g•dm -3 .…”

“…The largest share of whole energetic plants has a willow tree. In Poland, there are approximately 780 willow plant plantations with a surface area of 9480 ha which contains approximately 95 % of perennial plants cultivation [3]. Biomass comprises components which are contained in organs, for example: proteins, fat and lignin and structural material of biomass: polymerized carbonohydres, lignin and cellulose.…”