Final answer:
Normal concrete typically reaches about 90% of its design strength within 28 days of curing, but it continues to cure and gain strength slowly over time, even after this period. Calculation of the resistance, viscosity, and power supply in concrete pumping are based on fluid dynamics principles.
Step-by-step explanation:
How long does it typically take normal concrete to cure in order to reach its design strength? Usually, concrete is expected to reach about 70% of its full strength after 7 days of curing and should generally achieve about 90% of its final strength in 28 days. However, the curing process can vary based on environmental conditions, mixture proportions, the size and shape of the concrete structure, and the type of cement used. Yes, concrete does continue to cure and gain strength after the initial 28 days, although the rate of strength gain will generally slow down substantially. The curing process can continue for years, but most of the strength gain will have occurred within the first few months.
Regarding the problem provided, (a) the resistance of the hose can be calculated using the formula for fluid flow and pressure, (b) the viscosity of the concrete can be determined by applying the principles of laminar flow and Poiseuille's law, and (c) the power supplied can be calculated using flow rate and pressure, with the assumption that elevation change does not affect the power since the point of use is at the same level as the pump.