Frequently Asked Questions (FAQ)

We often get many of the same questions asked over and over again, so we thought this would be a good place to have as a reference for the most commonly asked questions.

What size rock do you use?

We use 3/4″ round rock. Due to the gradation of the rock, some of the stones are as small as 1/4″.
Do you provide wheelbarrows?

We do not carry wheelbarrows on the truck! Sorry! =(
How long does it take for the concrete to set up?

It depends on several different factors, but normally you can walk on it CAREFULLY (No twisting!) in about 12 hours. After 48 hours you can remove the forms, but it’s better to leave them on for a whole week if possible. In 2 weeks you can park a car on your concrete. After 28 days, the concrete reaches its full strength.
How thick should my concrete be?

We recommend at least 4 inches on driveways, patios, sidewalks, and most slabs that we pour.
Do I need to use rebar or fiber mesh?

It depends on the application, but usually for driveways or other heavy-use areas, yes, using rebar and/or mesh helps to reduce cracking.
Do I need to have a gravel base? If so, how deep?

We highly recommend a sturdy gravel base. A base that is compacted and 2-3 inches deep is best.
What tools do I need? Where can I get them?

You should have at least a bull float edger and hand trowel. You can buy these tools at any of the building supply stores, or you can rent them at most rental shops.

How many pier blocks does 1 yard fill?

One cubic yard will fill about 10-12 pier blocks.
Do you do finish concrete work?

No, we are primarily a supply and delivery company, but we do have a sister company that can help you. Natco Development, LLC specializes in finish concrete work.
What does "air entrapment" do?

Air entrapment means the induction of very small air bubbles into fresh concrete. When the concrete hardens, the air bubbles form small voids, and these voids give concrete additional durability in freezing or thawing conditions.
How much air is in your concrete?

Again, here are some guidelines:

2500 PSI 3% – 4%

3500 PSI 4.5% – 5.5%

4500 PSI 5% – 5.5%
How many yards does it take to fill an underground tank?

Here are some approximate values for underground tanks:

1,000 gallons 5-6 yards

675 gallons 3 – 4 yards

500 gallons 2.5 – 3 yards
It's likely to freeze. What should I do?

To best protect your newly poured concrete, keeping it covered with hay or straw for two weeks should help.
How many wheelbarrows do I need for 1 yard?

It takes about 10-12 wheelbarrow full of concrete to make up a cubic yard.
How much does a cubic yard weigh?

One yard weights approximately 3,800 lbs. (nearly two tons).
How many yards does it take to fill cement blocks?

It takes one (1) cubic yard of concrete to fill eighty (80) 8-inch blocks. One cubic yard will also fill fifty (50) 12-inch blocks.
How high can our chute be without clogging?

Your pour can be five (5) feet high without a chute. With all chutes on, your pour can be 2 1/2 feet high.

Nation’s Mini-Mix, Inc.

811 53rd Street
Springfield, OR 97478

Tel: 541-686-3031
Fax: 541-683-1588

Footings and Foundations	3000-3500 PSI
Sidewalks	3000 PSI
City Sidewalks	3500 PSI
Hot Tub Pads	3500 PSI
Driveways	3500 PSI
Patios	3000 PSI
Shops	3500-4000 PSI
Garages	3500 PSI
Fence Posts	2500 PSI

1,000 gallons	5-6 yards
675 gallons	3 – 4 yards
500 gallons	2.5 – 3 yards