What does "crazing" on a concrete surface typically indicate?

Crazing on a concrete surface is characterized by a network of fine cracking that appears shortly after the surface has set. This phenomenon typically occurs due to rapid drying of the concrete, often exacerbated by environmental conditions such as high temperatures, low humidity, or wind. When the top layer of concrete dries too quickly, it can shrink and develop these fine cracks, which is what defines crazing.

Understanding this process is crucial for concrete practitioners because it highlights the importance of curing and protecting freshly placed concrete from rapid moisture loss. Effective curing strategies involve methods like using curing compounds, wet burlap, or plastic sheeting to maintain a suitable moisture level and temperature, thereby minimizing the risk of crazing.