EXTERNAL CHEMICAL SHRINKAGE OF PASTES CONTAINING FLUE GAS DESULPHURISATION (FGD) WASTE

Abstract

Kükürt gazi ati?inin (FGD) 7 günlük çimento hamurunun kimyasal büzülmesi üzerine etkileri ara?tyrylmy?tyr. FGD aty?y farkly ülkelerden farkly oranlarda elde edilmi?tir. Bununla beraber benzetilmi? FGD atyklary uçucu kül ve alçynyn kary?ymyyla laboratuarda elde edilmi?tir. Hamur su-ba?layycy orany 0.5 olarak sabit tutulmu?tur. Ba?layycy çimento ve FGD'den olu?maktadyr. Çimento, FGD aty?ynyn a?yrlykça %25 oranynda yer de?i?tirilmi?tir. Sonuçlar de?i?ik yakla?ymlar göstermektedir. Kalsiyum sülfat kullanarak olu?turulan FGD aty?ynyn çimento hamuru üzerine kysa ve uzun sürede kimyasal büzülmeyi azaltmy?tyr. SiO2-Al2O3-CaSO4 içeren hamurda toplam kimyasal büzülme de?eri azalmy?tyr.

Keywords

• Kimyasal büzülme, kükürt aty?y, FGD aty?y, Uçucu kül, Alçy,

EXTERNAL CHEMICAL SHRINKAGE OF PASTES CONTAINING FLUE GAS DESULPHURISATION (FGD) WASTE

Öz

The effect of including flue gas desulphurisation (FGD) waste on total chemical shrinkage of cement paste up to 7 days is reported. The FGD wastes were obtained from different plants located in different countries which vary in compositions. Also simulated FGD wastes were prepared in the laboratory which is a blend of fly ash and gypsum. Pastes were prepared with water to binder ratio of 0.5. The binder consists of cement and FGD. Cement was replaced with 25% (by weight) of different FGD materials. The results reported show varying trend depending upon chemical composition. Using calcium sulphate based FGD waste in cement paste, both the short and long-term total chemical shrinkage were reduced. For paste containing SiO2-Al2O3-CaSO4 based waste the total chemical shrinkage was reduced. The chemical shrinkage values of pastes with simulated FGD waste were comparable to actual FGD waste with similar SO3 content.

Anahtar Kelimeler

• Chemical Shrinkage, Desulphurised Waste, FGD Waste, Fly ash, Gypsum,