Technical Questions Archives - American Shotcrete Association

I am working on a project that has existing tunnels made with shotcrete. I am needing to hang 12 in. (300 mm) duct and trying to figure out the best type or suggested anchors to use.

Shotcrete is just a placement method for concrete. Shotcrete placement [...]

By shotcreteweb|2021-07-26T17:54:27+00:00July 26th, 2021|Technical Questions|

We have shotcrete test panels, 12 by 12 by 6 in. (300 by 300 by 150 mm). My question is it OK to move the panels right after shooting to different location for initial curing or should the panels be left untouched for certain period of time at the spot of shooting?

In normal weather conditions test panels should be undisturbed for [...]

By shotcreteweb|2021-07-26T17:53:30+00:00July 26th, 2021|Technical Questions|

I am in the process of hiring a contractor to install a pool at my home. I have a long driveway, about 350 ft (100 m) and the pool will be constructed behind my house. The contractor wants to remove a substantial amount of plantings to allow the shotcrete truck to get closer to the pool area. How far can you reasonably pump shotcrete horizontally and what type/brand pump would be needed?

Shotcrete placement conveys concrete materials through a delivery line that [...]

By shotcreteweb|2021-07-26T17:51:51+00:00July 26th, 2021|Technical Questions|

We have a cast-in-place wall with extensive rock pockets and voids from inadequate vibration during casting. One option is to tear down the wall and replace, however we are wondering if shotcrete can be used to repair the deficiencies. If so, what are the recommended procedures to prepare and shotcrete the repairs?

Shotcrete is a great solution to your wall casting issue. [...]

By shotcreteweb|2021-05-26T18:14:16+00:00May 26th, 2021|Technical Questions|

Can carbon nanotubes be used in shotcrete?

Shotcrete is a placement method for concrete so most admixture [...]

By shotcreteweb|2021-05-26T18:11:39+00:00May 26th, 2021|Technical Questions|

Can a gunite bridge surface be painted? And if so, what preparation/materials are recommended.

Yes, shotcrete is a placement method for concrete, so any [...]

By shotcreteweb|2021-05-26T18:10:39+00:00May 26th, 2021|Technical Questions|

Please discuss the differences in curing/shrinking cracking challenges for wet-mix shotcrete versus dry-mix shotcrete (gunite). In my limited experience, wet-mix shotcrete tends to crack easier than dry-mix shotcrete. In general terms, or on average is gunite more porous, but less likely to show cracks?

Both wet-mix and dry-mix shotcrete when using proper materials, equipment [...]

By shotcreteweb|2021-01-04T21:20:05+00:00January 4th, 2021|Technical Questions|

I would like to know how could I obtain an expert opinion from ASA stating that a particular person specializes in gunite (dry-mix shotcrete) operations and that the person is amply qualified to perform such work?

ASA is the international trade association dedicated to advancement of [...]

By shotcreteweb|2021-01-04T21:18:26+00:00January 4th, 2021|Technical Questions|

We are working on a design-build project located in southern California of which the perimeter walls of the underground parking structure are planned to be shotcrete. Do you recommend any particular ACI publication that would be applicable to the shotcrete operation or does ASA have their own publications, similar to ACI, that are more appropriate to shotcreting?

ACI Committee 506 is the technical committee responsible for creating [...]

By shotcreteweb|2021-01-04T21:17:22+00:00January 4th, 2021|Technical Questions|

Do you have any case studies or applications where Ground Granulated Blast Furnace Slag (GGBFS) cement was successfully used in the concrete mix?

Shotcrete is a placement method for concrete. Concrete mixtures that [...]

By shotcreteweb|2021-01-04T21:16:22+00:00January 4th, 2021|Technical Questions|

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