Shotcrete Mix

[PoolGuyMi]

Anyone have a good shotcrete mix design?

[4serendipity]

35 mPa with 2lb of glass fibers per 8 meters of concrete. Birds eye sized aggregate and 1.5" slump - probably some retarder as well depending on how far away the batch plant is from your jobsite. Make sure the concrete truck does NOT show up hot (concrete old and starting to turn) and must be completely free from foreign debris of larger aggregate.

Make sure your ready mix supplier knows that you will not accept bad concrete so mix it properly or you will be sending it back.

I hope this information is helpful.

S

[loves2read]

so I am not pool builder--but is this is something I would ask pool builders we ask to bid our build?

what type of shotcrete formula do they specify and what do they look for when the truck shows up--

[jconall]

so I am not pool builder--but is this is something I would ask pool builders we ask to bid our build?

what type of shotcrete formula do they specify and what do they look for when the truck shows up--

You can ask but will probably get a puzzled look. Builders deal in PSI, 3000+ PSI Pneumatically shot in is about all the average homeowner needs to know.

http://buyingaswimmingpool.blogspot.com

[loves2read]

I have read posts on other sites/forums that you can't always depend on getting that mix when the truck shows up

is there anyway to tell (besides trusting your PB) that you are getting quality material

thanks

[jconall]

I have read posts on other sites/forums that you can't always depend on getting that mix when the truck shows up

is there anyway to tell (besides trusting your PB) that you are getting quality material

thanks

Shotcrete guys know which concrete companies are reliable and which are not, normally. Unfortunately, the concrete comes hot from the plant and can only sit in a truck for so long. So, you are kind of stuck. The best thing to do is to call the concrete company and order the mix. Tell them that it needs to be perfect. As a matter of fact, you need a certificate stating exactly what it is. This locks the concrete company into guaranteeing they are selling you what they say they are. This ups the reliability but is still not a 100%. You can tell them that you will be drilling a core sample, at the 30 day cure mark and sending it out for an engineering psi test. That should motivate them to get it right. That is about all you can do, which is a pain. The shotgrete guys can feel when it is good and bad, but that doesn't mean they are going to tell the homeowner about it. A good way to tell is if they are really PO'ed before concrete gets there (because someone screwed a form up or something) or after the concrete gets there (besides if it is late).

Temperature can affect the concrete (too hot and too cold out) and time between concrete trucks (assuming you will need more than one truck).

http://buyingaswimmingpool.blogspot.com