Rheological model for self consolidating concrete Chat with older women free no sign up
Behind the pump, a loop circuit was installed with 100 mm diameter pipes, allowing the concrete to flow back inside the hopper of the pump.The circuit was 103 m long for SCC A and B, and 81 m long for SCC C and D (Fig.The flow rate was then increased to around 7 l/s, equilibrium in pressure was awaited for and the down-curve (7 and 4 l/s) was determined.
Many studies have recently been performed to understand and optimize the pumping process and identify the main differences between pumping of conventional vibrated concrete and self-consolidating concrete (SCC).
The first horizontal straight section was constructed with 100 mm diameter pipes.
After making a 180° turn and enlarging the diameter, a second straight horizontal section in 125 mm pipes was installed, followed by a vertical part enabling the concrete to flow back inside the reservoir of the pump (Fig. Starting at the lowest flow rate step of the pump (1), flow rate was maintained until pressure achieved equilibrium, followed by taking a sample and a quick stepwise decrease in flow rate, not exceeding the maximum flow rate already applied (except for step 1, where there is no descending The lowest flow rate was first examined (around 4 l/s), and logically, there was no decreasing curve.
Such test generally took 5 min and was repeated four or five times at 30 min intervals.
After each pumping test, a sample of the concrete was characterized by means of slump flow, V-Funnel, density and air content, sieve stability, rheology (by means of the ICAR) and tribology .