Best Concrete Slump For Footing

By john carroll issue 277 aug sept 2018 i ve done a bit of concrete flatwork stairs stair landings for decks some slabs and so forth but now i have a client asking for a concrete walkway in front of his house and one section of it say.

Best concrete slump for footing.

You really can t say which slump is safe to use unless you have the design. Wetter mixes are more commonly used for trench filled foundations where a high flow is required whereas dryer mixes. We normally use on call concrete with 4000psi mix. Approx 50 70 slump are used mainly in simple strip footings and for hard standing slabs.

Typically reinforced concrete ranging between 3 500 to 4 000 psi is used on footing and slabs on grade. I don t know the exact specs for a c 4 mix. This characteristic is measured in terms of slump the higher slump values the more manageable and greater mobility will be obtained. Between 3 500 to 5 000 psi on suspended slabs beams and girders.

It is best to use the uncut end of the tube for the top of the footing. It depends on the ground it s sitting on too was the dirt compacted good. And walls and columns normally require between 3 000 to 5 000 psi. Footings are especially important in areas with troublesome soils.

Find nearby slab and foundation contractors to help with your footings. We offer five different types of concrete slump ranging from dryer mixes 30 50 slump and wetter mixes 90 120 slump. Seems like a very tight mix for a 1st floor residential footing and slab. The contractor who plans to build the foundation walls for our house makes a practice of using concrete with a slump of 6 1 inch.

High strength concrete mixes offer exceptional durability and long lasting performance. I work this area all the time and ive never read that requirement from any of the dozen or so architects ive worked with. This property determines the mobility and slump of the concrete mix. One of the most important factors before ordering ready mix concrete is knowing the required compressive strength.

Step 6 add the concrete mix to the form. Do you have the design for the concrete mix. Im reading these plans that specify a 2 4 slump on all concrete. Generally if it s flat guys go for a 6 slump.

Step 7 continue to add concrete until the form is overfilled slightly. You can have it designed for 4000 psi at a 7 slump if you want. 2 4 slump required on residential slab and footing. Be sure to choose a high strength concrete mix like sakrete 5000 plus high strength concrete mix or sakrete concrete countertop mix for your concrete countertop project to ensure it will remain strong and durable over time.

The concrete mix workability is the property that determines the mix capacity to be placed and consolidate properly allowing to finish a product without segregation.