They noted frost depth, soil moisture, soil texture, ground cover, and exposure. The deepest observed frost depths during this period ranged from 5 inches in far southern Illinois to 30 inches in far northern Illinois.
How deep and wide do footings need to be?
In most residential situations, #4 rod at 12 inches o.c. will be plenty for 8-inch-thick footings up to 4 feet wide. The steel should be placed about 3 inches up from the bottom of the footing.
How long does concrete take to set in a post hole?
Effects. When fast-setting concrete mix is used, setting takes place in 20 to 40 minutes. Typically, you can apply some weight to the posts after 4 hours, but it's a good idea to wait at least 24 hours before resuming fence construction.
How deep is the frost line in my area?
In order to combat this problem, footings are placed 6 inches below the frost line. The frost line is the maximum depth where the ground will freeze in the winter. In Minneapolis/St. Paul, Minnesota, footings are required by code to be between 54 and 60 inches deep.
What happens if you put too much water in concrete?
What happens when you add too much water to concrete and/or other cement mixes? Over-watered concrete may lead to lower strength, reduced durability, shrinkage cracking, and a variety of surface problems. It is critical that the proper amount of water be added to concrete and other cement mixes.
Why slump test is done?
Concrete slump test. The slump test measures the consistency of fresh concrete before it sets. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. It can also be used as an indicator of an improperly mixed batch.
How long does it take quikrete to cure?
Pour up to one gallon of water into the hole until is soaks into the QUIKRETE Fast Setting Concrete Mix and allow the concrete to set for 20 to 40 minutes. Wait four hours before placing any heavy objects or allowing traffic.
How long does quikrete have to cure?
The simplest way to set a post is to pour the dry material into the hole and then add water. The preferred product is QUIKRETE® Fast Setting Concrete. It is ready to use in 4 hours. QUIKRETE® Concrete Mix can also be used for setting posts, but you must wait a few days before applying heavy loads.
How long does quikrete 5000 take to cure?
It has a walk-on time of 10 - 12 hours. QUIKRETE® 5000 can be used for any application requiring concrete in a minimum thickness of 2" (51 mm), such as slabs, footings, steps, columns, walls and patios. YIELD.
How much does an 80 lb bag of concrete weigh mixed?
This means the “density” of concrete is about 145 lbs per cubic foot. Now that we have that information we can calculate the yield. Add up both the dry material in the bag (80 lbs) and the water it takes to mix it up (1 gallon which weighs 8.3 lbs) for a total weight of 88.3 lbs.
How long does it take for concrete to harden?
Curing Time for Concrete. In standard industrial cases, full strength concrete is recognized at 28 days. At seven days, you should have concrete that is cured to 70% full strength or greater. But to answer the question of, “How long does concrete take to set?”, concrete setting time is generally 24 to 48 hours.
Is it OK if it rains after pouring concrete?
If the rain occurs when the concrete is fresh (about 2-4 hours after mixing), the surface should be protected from the rain. If the finishing process was recently completed, rainwater may not cause damage as long as it is not worked into the surface and the slab is left untouched.
Can concrete cure in freezing temperatures?
Ensure that your cold weather concrete has cured and do not allow hardened concrete to dry out. Keep ice from forming - Once ice has formed, hydration stops and strength development is seriously impaired. Fresh concrete frozen during the first 24 hours can lose 50% of its potential 28 day strength!
What temperature is too cold to pour concrete?
First, let's define cold weather with respect to concrete. Any time you have three consecutive days where the average daily temperature is less than 40°F, or if the temperature is lower than 50°F for less than half of any of the three days–that is unpleasantly cold for concrete.
How long before concrete can freeze?
Freshly mixed concrete must be protected against freezing until it reaches a compressive strength of 500 psi. At normal temperatures (70 degrees F) concrete usually reaches 500 psi in the first 24 hours. At 40 degrees F concrete could take up to 3 days to reach 500 psi.
Can you pour concrete in the rain?
Yes you can pour concrete when it rains. You can pour it underwater if you do it properly. Water on the surface will impact the finish, so if the concrete is going to be an exposed sidewalk or polished floor you should avoid pouring in the rain.
Is it OK to pour concrete in cold weather?
Cold Weather Concrete Tips. You can pour in cold weather, as long as certain precautions are taken. Concrete set time at 70 degrees is approximately 5 hours, at 50 degrees it is 10 hours, at 30 degrees it's up to 20 hours (if the concrete doesn't freeze!).
Can you pour a concrete foundation in the winter?
You Can Safely Pour a Concrete Foundation in the Winter. Actually there are safe, effective ways to pour a concrete foundation in cold weather. They all begin with protecting the ground beneath the foundation from frost, snow, and ice. The heat helps the concrete to cure before it freezes.
What is the ideal temperature for concrete to cure?
If concrete is cured in cooler ambient temperatures (32°F to 50°F) with moisture continually present, strength gain will be slow but the concrete will eventually reach a high strength. Concrete should not be allowed to get hotter than 90°F or to dry out during the curing period.
How hot does concrete get when it's curing?
If concrete is cured in cool temperatures (32°F to 50°F), strength gain will be slow but the concrete will eventually reach a high strength as long as moisture is continuously present. However, concrete should not be allowed to get hotter than 90°F or to dry out during the curing period.
What is the minimum temperature for mortar?
When mixed, the mortar should be in the range of 40°F to 120°F (4.4°C to 48.9°C) and kept above freezing until used in masonry. If ambient temperatures are falling below freezing, a minimum grout temperature of 70°F (21.1°C) is recommended at the time of grout placement.
How far down is the frost line in Alaska?
In Alaska, every region has building codes and/or generally accepted design standards that specify the depth of the local frostline. In Fairbanks, the design depth for footings is a minimum of 42 inches below grade.