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A new thixotropic model is developed integrating the Papanastasiou-Binghammodel with thixotropy equations to simulate the flow behaviour of TremieConcrete in the Material Point Method framework. The effect of thixotropy onthe rheological behaviour of fresh concrete is investigated by comparing fieldmeasurements with numerical simulations. The comparison yields new insightsinto a critical and often overlooked behaviour of concrete. A parametric studyis performed to understand the effect of model parameters and rest-time on theshear stress response of fresh concrete. The Material Point Method with thePapanastasiou-Bingham model reproduces slump-flow measurements observed in thefield. The novel model revealed a decline in concrete workability during theSlump-flow test after a period of rest due to thixotropy, which the physicalversion of the test fails to capture. This reduction in workabilitysignificantly affects the flow behaviour and the effective use of freshconcrete in construction operation.

Investigating the Thixotropic Behaviour of Tremie Concrete Using the Slump-flow Test and the Material Point Method