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I am a general contractor who hired a company to shotcrete a new swimming pool.

2015-10-31 17:50:45

Question:
I am a general contractor who hired a company to shotcrete a new swimming pool.

They began on Friday, a very hot day, and they were placing concrete very slowly (27 yards in 4 hours). Their pump broke down and they were unable to complete the job that day so they returned on Monday. My Question is about the "cold joint" between the work on Friday and the work on Monday. What is your opinion of this situation?



Answer:
On large swimming pools, it is not unusual to have joints that are left over a weekend or longer. The key is the means by which the joint is dealt with. As with any concrete joint, the surface needs to be clean and free of laitance or other contamination. This can be accomplished by cleaning the joint while it is green on the first day or by cleaning with waterblasting, sandblasting, or wire brushing after the surface has gotten hard. As long as the joint is clean, all gloss has been removed, and the joint is dampened the structure should not be impacted by the joint. Also, 27 cubic yards in 4 hours is not necessarily slow production. Depending upon the circumstances, I would think that 27 cy in 4 hours was quite productive. 

 
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hydroseeding equipment for sale automatic grouting station container type grout mixer with agitator Inverter speed high pressure grouting pump electrical refractory gunning machine concrete planetary mixer dry and wet shotcrete machine for sale high pressure hose pump hydraulic jack CLC brick block making machine ceramic mud pump mud pump packaging portable hydraulic drive DTH drilling machine screw plastering pump with mixer marking removal machine electric concrete mixer pump hydraulic pumping station DTH drill bit scraper conveyor
GHS15190 Hydroseeding equipment GGP1000/2X75/100PI-E Automatic Grouting Station GMA30 Automatic mixing plant and HCS17B cement silo GGP440/50PI-22E Inverter speed high pressure grouting pump GZ-3ER/S Electrical refractory gunning machine GCPM UHPC planetary concrete mixer for sale GSZ-10S/E Electric shotcrete machine (dry and wet) GH100-915B Super high pressure bentonite hose pump Double acting hydraulic jack GF5H CLC foam concrete making machine Hydraulic ceramic piston pump BW850-2 Mud Pump GPD100H Portable hydraulic drive DTH drilling machine GMP-5X Mortar plastering machine with mixer and screw pump GD-D390 Marking Removal Machine JBT40 P2 Electric concrete mixer pump GBHPP15/55X2-30D Hydraulic power unit DTH High pressure drill bit GSC500H Scraper Conveyor
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