Case Study Information
Project Type: Spillway Remediation
Project Type (Other): Government
Project Start Date: February 9, 2026
Project Objective:
The primary objective of this project is to resurface the damaged concrete cover layer to protect the exposed masonry structure beneath. The concrete canvas serves as a new coating to resist erosion caused by water flow and maintain the stability of the spillway so it continues to function safely.
Project Location: Central Lombok, West Nusa Tenggara
Number of Concrete Canvas Used: 360 m²
Roll Format: Bulk Roll
Type / Thickness: CCX-M
Layup Method: Vertical
Installation Process
Equipment used
- Cutter/utility knife
- Dynabolt M10 x 50
- 20 mm stainless steel screws
Alternatives and Reasons for Choosing Concrete Canvas
The reason for using concrete canvas is its ease of installation and speed of application. This material can be installed quickly without the need for conventional concrete pouring, eliminating the need for extended floodgate closures. After approximately one day of installation and hydration, the concrete canvas is ready for use, allowing dam operations to continue normally without significant disruption.
Environmental Conditions
The project's environmental conditions are in an agricultural area, where the spillway is part of a reservoir dam structure used for rice field irrigation. The spillway, protected by concrete canvas, has significant benefits for the local community, as it maintains smooth water flow, prevents leaks or further damage, and ensures the availability of water for agricultural irrigation. Thus, these improvements have a direct positive impact on agricultural productivity and the well-being of residents surrounding the dam.
Land Preparation
- Tidying up the damaged concrete cover layer
- Cleaning up debris/sediment stuck in the spillway
- Smoothing the spillway surface
Installation, Bonding, and Sealing Methods
The concrete canvas was installed vertically in eight segments. Each segment was connected to the overlap using 20 mm screws. To ensure stability and prevent shifting, each connection was anchored with M10 x 50 mm dynabolts at 1.5 meter intervals. This method ensured the concrete canvas was firmly and securely attached to the spillway surface.
Hydration Method
The concrete canvas hydration process utilizes water flow from the dam. The sluice gates are opened, allowing water to automatically wet the entire surface of the concrete canvas. Once the entire surface is evenly hydrated, the sluice gates are temporarily closed again for one day until the concrete canvas hardens. Once this process is complete, the concrete canvas is ready for use, and the spillway can return to its original function.
