Our shotcrete contractor started shooting our residential swimming pool on a Friday and stopped 1/3 of way through the process. They plan to restart and complete shooting the pool the following Monday. This site is in Houston and has been averaging 90+ °F (32 °C) average daily temperatures. Aside from soaking the existing pool structure during the hiatus and additional continuous watering through the 10 days after completion to let concrete cure, what steps do I and the contractor need to make to ensure a cold joint will not fail and leak in the future? I will be able to supervise the second shot. What can I do, or make sure the contractor does, to ensure the structural integrity and quality of my investment?

Wet curing of newly placed concrete is certainly important. Your [...]

By |2021-01-04T21:15:29+00:00January 4th, 2021||

I work for a Commercial pool builder. We are doing a Jr. Olympic pool (competition pool) 40 ft by 70 ft (12 m by 21 m) with a 20 ft by 10 ft (6 m by 3 m) swim out area with steps. I would rather have the entire pool shot with shotcrete. The office wants the floor poured first then shoot the walls the next day. Can you talk about any advantages or disadvantages to either? Normally we are in a remote location with no power or water. We’ve had issues with shotcrete cracking on the floors and I understand that can happen because of many factors but poured concrete can as well.

Casting the floor first is recommended. Note that rebound and [...]

By |2021-01-04T21:13:11+00:00January 4th, 2021||

: I am working on a fire re-build project near Napa, CA. The existing building has 12 in. (300 mm) thick shotcrete basement walls. There are many areas where the concrete cover spalled off from the rebar. The rebar appears to be ingood condition with no visible buckling. Is it possible to repair these walls with a 1 1/2 to 2 in. (38 to 50 mm) layer of shotcrete to restore the concrete cover? If so, what sort of surface prep is required? Is a concrete bonding agent required?

Yes, this is definitely a good application for shotcrete. To [...]

By |2021-01-04T21:11:26+00:00January 4th, 2021||

We are working on a repair/renovation project in Boston. A long-concealed wall next to an adjacent property is now visible as the adjacent property is being renovated. We have been told that our wall must have a 2-hour fire rating. Our wall is composed of CMU masonry and exposed structural steel members. Applying shotcrete to the CMU and steel is a good solution for several reasons. Would you provide shotcrete specifications that will have a 2-hour fire rating on CMU and structural steel?

Shotcrete is a placement method for concrete. Thus, the fire [...]

By |2020-08-12T15:24:43+00:00August 12th, 2020||

I have a 24 in (600 mm) thick shotcrete wall that will have to be scanned for voids. The project has been struggling to locate a local expert who has the capability to scan this thick of a wall. In addition, this new 24 in thick shotcrete wall was dowelled and made “as one unit” together with an existing 24 inches thick cast in place wall. What technique should I use to get the right proportion?

Shotcrete is a placement method for concrete. Thus, all non-destructive [...]

By |2020-08-12T15:23:14+00:00August 12th, 2020||


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