This technology is a canal repair and construction method that covers the entire inner surface of a canal, including joints between canal blocks, with a perforated elastic fabric member, then applies and cures a polymer mortar composition to bond the canal surface, fabric, and mortar into a single layer.
Concrete canals often develop gaps and cracks at block joints over time, leading to leaks and requiring costly periodic repairs. Conventional methods, such as filling joints with mortar or sealant or attaching joints and brackets, often fail because the materials freeze and crack during winter or break off due to freeze-thaw cycles, making repairs non-permanent.
This technology uses two types of silica sand with average particle sizes of 0.15–0.3mm and 0.05–0.14mm, both smaller than the fabric perforations, allowing part of the mortar to penetrate through the fabric to the canal surface. It incorporates a polymer blend with glass transition temperatures of -60 to 10°C and 10 to 60°C (16.5–24.5 wt% each) and 0.8–1.2 wt% fumed silica. A 2–30mm thick elastic non-woven fabric is stretched tightly across the inner side walls, floor, and top, and can be finished with a UV-protective coating after curing. Applicable to agricultural irrigation canals, roadside drainage, and aging concrete U-shaped canals, it prevents joint rupture during freeze-thaw cycles and increases flow capacity by smoothing the interior.
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