In Hong Kong, footways typically feature paving slabs or interlocking blocks instead of traditional concrete due to aesthetic and practical considerations. Extensive concrete use can result in monotonous landscapes, and the frequent excavation required for utility maintenance often leads to unsightly patchwork repairs. Additionally, the extended setting and curing time of concrete can cause significant disruptions to pedestrian traffic and daily life.
To address these issues, paving slabs or interlocking blocks are employed, offering a visually appealing and versatile alternative. These units provide load-bearing capacity in two primary ways:
- Individual Strength: Each slab or block possesses inherent strength, allowing it to withstand pedestrian loads independently. This ensures that even if individual units are damaged or removed, the overall integrity of the footway remains intact.
- Interlocking Forces: The interlocking design of these units, combined with the friction generated by sand in the vertical joints, creates a network of interconnected elements. This interlock distributes pedestrian loads across multiple units, enhancing the overall load-bearing capacity of the footway.
This dual-support mechanism, as outlined in the research by K. K. Tang and Robert P. Cooper (1986), allows for a durable and visually appealing footway that can withstand pedestrian traffic while minimizing disruptions caused by maintenance and repairs.