Which of the following affects the effectiveness of asphalt coring?

The effectiveness of asphalt coring is influenced by various environmental and material conditions, which makes the option that includes all listed factors the most comprehensive.

Humidity levels can impact the bonding properties of the asphalt mixture. High humidity may lead to increased moisture content on the surface, potentially affecting the core's integrity during extraction.

The presence of moisture in the asphalt itself is crucial as it can weaken the binding properties of the asphalt. If moisture is present, it may lead to issues such as stripping, which occurs when the asphalt binder loses adhesion to the aggregates. This can compromise the strength of the core sampled.

Temperature of the asphalt plays a significant role as well. The viscosity of asphalt changes with temperature; if the asphalt is too cold, it may be too hard and brittle, leading to incomplete coring or damage to the sample. Conversely, if it is too hot, the asphalt may flow or deform, making it difficult to obtain a clean, intact core.

Each of these factors can significantly affect the overall quality and reliability of the asphalt core sample, thereby supporting the idea that all of them collectively impact coring effectiveness.