Steel Vs Concrete

[necr]

Hi there,

I have been tasked to coordinate a project to install a structure to support mineral processing equipment for underground mining operation. However i got stuck in the process when my consultant asked if i want steel or concrete? So by request i am looking for an opinion on which one is appropriate between steel and concrete for underground mining application.

Thanks in advance.

 

[dbuzz]

It's horses for courses and will depend on the type of equipment.

A large piece of reciprocating or vibrating machinery is probably best supported on a structure with a large self-mass, in which case concrete would probably be the preferred material of construction.

For smaller pieces of equipment, conveyors, etc., steel is probably a more flexible material of construction.

 

[DaveAtkins]

Also check if the structure needs an hourly fire rating. Sometimes concrete becomes cheaper than steel because so much fireproofing is required for the steel option.

DaveAtkins

 

[MotorCity]

You may also want to consider the material that is being mined if it will be in frequent contact with the structure. One material may be more resistant to corrosion, pitting, etc. Good luck.

 

[JStephen]

Consider how big it is, where it goes, where local concrete comes from. If the thing can be fabbed and shipped in one conveniently sized piece, steel is probably the answer. If you don't have a readymix plant within 30 miles, concrete can get awkward.

 

[14159]

Will it be exposed to the weather? Will it be underground? How heavy are the loads? There are too many unknowns to give an intelligent piece of advice.

DBD

 

[Lutfi]

I designed structural components and equipment supports for underground coal mines in West Virginia. Be careful of corrosion!! No matter what material you wind up using, use the right corrosion protection. For steel hot dip galvanized (and stainless steel fasteners). I recommend the higher grade stainless such as 316 in lieu of 304 stainless.

As for the concrete, ask you consultant to adhere to ACI for items such as:

1. Strength of concrete (I would not use anything less than 5000 psi for starter).
2. Increase the rebar cover
3. Use proper cement due to chemicals presence (natural and man made)
4. Low water cement rations (I would use nothing higher than 0.4 which can be met by default if 5000 psi concrete is used)
5. Any other related items such as addition of corrosion inhibitors/

Good luck


Lutfi

http://www.cdeco.com