Posted: 11/1/2010 7:53:14 AM EDT
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My city has decided to install sidewalks along my street and as part of that they are replacing everyone's driveway (from the street to about 10' up the drive).
My house was done on Thursday and temperatures have ranged from 40 deg to 70 deg since then. The concrete is dry to the touch and I can walk on it with no problems. I am doing some house remodeling and need to have a dumpster delivered to haul away my junk. Question: How long does the concrete have to cure before it can take the weight of a big truck and a loaded 20 yard dumpster? I would really hate to crack the thing the week after it was poured. Thanks! |
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More than likely, they used 3000 psi concrete, and usually an engineer will not let any heavy equipment on concrete within 28 days of placing (provided it's met 75% of it's compressive strength). I doubt they took any core samples to test if they are just replacing sidewalks, but I may be wrong. I wouldn't put a dump truck on 4 day old concrete without permission. Make some phone calls... |
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Quoted:
Maximum strength is achieved in 28 days. Depending on the addition of accelerators or ad mix. Minimum wait is 7 days. Cracking doesnt occur due to curing time or lack thereof. Ding Ding! There's your answer. Call the city and have them get the information from the design mix. |
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Quoted: Did the use rebar or wire mesh? If rebar you should be ok in 7 days. I've run a 200 ton crane on 7day 3000psi mix. If they used mesh it won't make a fuck it will crack anyway. What is the surface area of the crane that is in contact with the ground? Tracks, big ass wheels? Roll off containers are often on little steel wheels. |
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Quoted:
Just park the dumpster in the street like you would parallel park a car. That is what folks do around these parts. Give the concrete time to cure. Can't do that - I live on a fairly major road. To address another poster: the dumpster itself won't be sitting on the new concrete - it's just the driveway approach at the street that was replaced. I have plenty of room on my driveway for the dumpster to sit. My concern is if the big truck that brings the container is too heavy for a the new concrete. ETA: Rebar or mesh question. I don't know. They were starting to dig up the area as I left for work, and when I came back, the concrete had already been poured and barricaded. |
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It depends on the mix. I did a special one where they had loaded eighteen-wheelers on it in 24 hours. I'll bet the admixture that allowed that was very expensive. I've also seen poor mix designs that didn't reach required capacity by the 28-day break. The problem is that you can't tell by looking at the concrete.
Call the city. I'm sure they don't want the new concrete cracked, either. |