Influence of circulating fluidized bed combustion (CFBC) fly ash on properties of modified high volume low calcium fly ash (HVFA) cement paste
作者： Hoang-Anh Nguyen , Ta-Peng Chang , Jeng-Ywan Shih , Chun-Tao Chen , Tien-Dung Nguyen
DOI: 10.1016/J.CONBUILDMAT.2015.05.075
关键词:
摘要: Abstract The high-volume low calcium fly ash (HVFA) cement has been successfully applied to the roller compacted concrete, highway base material, and other structural constructions. HVFA based high performance concretes have workability, acceptable strengths, superior durability. However, issues of increase in setting time decrease early compressive strength remain. aim this investigation is use circulating fluidized bed combustion (CFBC) improve mechanical properties, including dynamic Young’s modulus ( E d ), shear G ) pastes at ages. properties prepared by ordinary Portland (OPC) that was partially replaced Class F (FFA) with without sulfate activators (i.e., gypsum or CFBC ash) 50% weight were explored. microstructures hydration products modified used explain improved strengths moduli specimens. Experimental results showed mixture gypsum) containing 0.81–1.62% SO 3 can significantly ages due more microstructures. accelerated tricalcium silicate (C S) precipitated ettringite (AFt) formation hardened clearly confirm important role enhance pastes.
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