Final answer:
To start edging and finishing concrete, the concrete must reach a specific firmness, often tested with the thumb test. Factors like temperature and concrete mix also influence timing. Proper timing ensures a durable and smooth surface.
Step-by-step explanation:
To determine when you can start edging the concrete and performing other finishing operations, you must assess the concrete's surface and consistency. The right time to start finishing depends on the concrete reaching a certain level of firmness where it supports some pressure without the surface being indented. A method commonly used is the 'thumb test', where you press your thumb into the concrete surface; if it leaves an imprint no deeper than 3/16 of an inch, it may be ready for edging and finishing operations.
It's important to consider external factors such as ambient temperature, wind, and humidity, as they can affect the concrete's setting time. Additionally, the specific mixture of the concrete can also alter the timing. Concrete finishing should be done carefully to ensure a durable and smooth surface. Timing the start correctly is crucial because starting too early can lead to surface damage while starting too late can make the process more difficult and may not yield the best results.