SHOTCRETE

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Shotcrete

Application of wet-mix shotcrete has a long history of proven feasibility, durability, and success with technologically sound and economically desirable results in comparison to conventional cast-in-place formed concrete. Since 1950s, this application was widely used in the west coast of the United States followed by British Columbia and Calgary in Canada.

Limen is one of the industry leading specialists in eastern Canada which performs this application in proper projects by using certified nozzleman (as per ACI-CP-60) and qualified crews with over five years of experience in reinforced shotcrete construction to apply and finish this application.

Limen is prepared to work with all clients using this approach for below and above ground walls in residential, commercial, institutional, and industrial projects. In specific, Limen can provide alternative analysis through value engineering to support the benefits of using this application for appropriate projects.

Main features and benefits:

Using shotcrete will allow all stakeholders to take advantage of the following benefits:

  1. Saving in engineering: in general, there is a minimal requirement for engineering of shotcrete applications. In comparison to the conventional forming system which normally requires detailed engineering drawings, this advantage will reduce or remove the efforts related to engineering accordingly.
  2. Saving in schedule: by using shotcrete for below ground applications, there is a potential saving on schedule since the outcome (daily contact area completed) of each wall constructed using shotcrete is almost twice the outcome of the same wall constructed using conventional approach.
  3. Saving in real estate: shotcrete for the perimeter walls will eliminate the need of A-Frames and therefore, it will release the areas adjacent to the perimeter walls for other activities. This benefit can highly affect the selection of application in projects with small construction areas.
  4. Releasing other equipment: by using shotcrete, other formwork equipment and logistics can be released and assigned to other activities. This advantage will positively affect the progress of work and will create more flexibility to the project team in planning concurrent tasks.
  5. Simplify formwork of irregular shapes: since shotcrete can be applied on any appropriate surface, using this method will eliminate the need of formwork on both sides of the irregular shapes such as curved or inclined walls. This saving can be provided in both cost and schedule related to these items.
  6. Providing better finished face: despite conventional forming, the exposed face of shotcrete applications gets finished by screeding the face similar to the method of finishing the top surface of the concrete slabs. This will eliminate any imperfection such as honeycombing by providing a properly finished surface.

Implementation of the Application:

We at Limen would proceed on the following basis in each stage of the Work:

  1. Procurement: we would participate in discussions and would cooperate with clients to provide a clear comparison between conventional and shotcrete approaches to assist them in their decision-making process.  
  2. Planning: we will provide a complete submittal package with written procedures and shop drawings, if required, and qualifications as well as recommendations to the client for their review and consideration. We can provide mock-up or test panels (0.45m x 0.45m x .11m) for specific conditions to ensure the quality aspect of the work will not be compromised.
  3. Implementation: prior to mobilization, we will run a site observation to ensure the blind face (for perimeter walls) or formed face (for interior walls) are properly set and ready to accept the application. Limen will set up the scaffold and proceed with each shoot following normal process or bench gunning in accordance to the alignment controls (shooting wires, guide strips, depth gauges or forms) and special focus to eliminate any overspray or shadow issues. The exposed face of each wall will get finished by the way of screeding operations followed by applying construction joints by the way of cutting the surface of the plastic shotcrete in accordance to the approved procedures or requirements.
  4. Post-implementation: shotcrete requires curing and protection after placing and finishing. We will take all required steps for both hot and cold weather conditions as stated in ACI 506.2 or CSA A23.1-04 to make sure that the final product will get delivered to the client with acceptable appearance and performance. In case of any deficiencies (after examining the root causes), we will act as soon as possible by providing the remedial procedures and proceed with any required repairs while shotcrete is still plastic. Although we are prepared to take the required actions to resolve any defects in hardened shotcrete applications.

Quality and Risk Considerations:

Similar to all other aspects and process in construction, Shotcrete requires quality and risk management and considerations in order to deliver the final product as specified without any negative impact.

Limen follows the publications and guidelines related to the quality of shotcrete applications such as ACI 506.2-13 and CSA A23.2-04 along with the internal QAQC plan related to shotcrete to avoid any issues associated with the quality of the final product.

Limen will monitor and enforce the internal Health and Safety Plan as well as published Guidelines and Acts or client’s written safety plans in order to eliminate any risk or negative safety impact on our team and others who may get affected by our execution

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