Hot weather is defined as any combination is high ambient temperature, high concrete temperature, low relative humidity, and wind velocity. If the concrete was 3000 psi concrete, came from a redi-mix concrete company, wasn't poured too wet (soupy), and you had a … Curing Times for Concrete. No harm should come to the concrete slab. It does not take long before you can drive on your fresh concrete. Curing is a process that demands attention and knowledge. You can start framing on a poured concrete slab about seven days after it’s poured. A. But a 4x4 usually is enough. How long must I wait before placing hot tub on slab and again before filling hot tub. Hot Tub weight aprox 800 lbs empty and about 4,000 lbs filled. A typical concrete compressive strength specification requires 4,000 to 5,000 psi at 28 days. Is 10 days long enough for a 4" X 7' X 8' concrete slab to cure before I put a hot Tub on it ? So, on that assumption, you could wait 7 years before you start to build Hot Tub on concrete slab. When you’re building a house and you’re using a concrete slab, you should be aware of how long that slab needs to cure before you start framing. But that wordy article - that does not really answer the question - but it does say that the only time you would wait a mere 7 days is in the case of exposed or out of grade shotcrete where you needed to back fill. For those who are laying concrete in a domestic area, like the garden, concrete is … The key is to be patient and let the concrete gain the strength that it needs. Many patios are formed from a concrete slab. Can't say if it is true or not, but I have heardit from many different sources. Thanks. In fact, at this point, even skateboards and bicycles should be kept off as their wheels concentrate the weight into small areas and are more likely to damage the still curing concrete. Typical industrial concrete will recognise its full workable strength at the 28 day mark. Later on in the article it talks about 100% strength in 28 days and not to fill the pool with water before the 28 day period. However, proper cold weather concrete curing will enhance concrete strength development. It is generally recommended that you wait at least a week before driving on … I had a new 12' x 28' concrete slab poured last Thursday. A concrete patio slab is typically 3 1/2 inches thick. BTW I have been told many times it takes a minimum of 7 years for concrete to fully cure and reach its rated strength. the plate, Its not going anywhere. *Concrete takes 21 days to fully cure but even cautious builders will start construction after a week.I'd wait three or four days before putting a column on it.Without knowing what it's holding up, nobody can tell you definately if a 4x4 or even a 6x6 is adequate. Specified concrete compressive strength is the minimum compressive strength at which the concrete should fail in standard tests of 28-day-old concrete cylinders. Keep tape across the fresh concrete to ensure that it is protected from any vehicles or people entering the driveway area. Steel columns are cheap and easy to install. by Kathy (Kelseyville, Calif.) Q. At this point, a concrete slab will have 70% of its fully cured strength. After 7 days of curing, the concrete will have reached approximately 70% strength. We live in Minnesota. After it's poured, it must be allowed to cure properly before it can be walked on or used for entertainment.