Abstract
In study, we quantitatively evaluate and compare high-viscosity concrete with type fourth fly ash and normal concrete. We estimate the deformability of fresh concrete using a pumping tester and investigate the pumpability of concrete. In this study, the range of stable pumping is evaluated by having the average pump oil pressure and the coefficient of variation of the oil pressure. At an average pump oil pressure of less than 0.50 MPa and coefficient of variation of less than 15 %, the range of steady pumping of fly ash concrete and normal concrete are different. Concrete with type fourth fly ash significantly decreases the coefficient of variation of the oil pressure and prevents the stoppage of fresh concrete flowing in pipe.
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