CHIMECAL RESISTANT / TRUCK AREA CONCRETE COATING 2

[NADOR123]

Hi everyone,

We experiencing bad result of a cementious coating in a treatment plant sludge trucks unloading area.
Any suggestions or previous experience of the right coating system for chemical resistance and heavy truck traffic load.

Thank you

 

[RWF7437]

It would help to know what the "bad result" is that you are experiencing. Is it structural failure, chemical attack, some combination ?

But remember that, by definition, "asphalt" is a hydrocarbon compound which is soluble in gasoline. That is why Portland Cement Concrete (PCC) is preferred in areas where there may be gasoline leaks. These include long term parking areas, fuel stations, and similar places. A cementitious coating may fail structurally under the heavy truck loads thus allowing chemical attack on the underlying asphalt.

Try posting on another forum to see if you get better insights on this.

good luck

 

[civilperson]

An epoxy overlay as used on bridge decks will probably be resistant to every chemical attack that is possible.

 

[gerhardl]

'civilperson' is right, this is what usually is done for floor-coating in food processing industries, slaughterhoses etc.

Be however in addition sure to hire in a company using the correct epoxy material, thickness and laying process. Mixture, temperature , thickness and hardening time essential.

Check also that the surface to be treated (concrete!) is firm, clean (free of fat) dimensioned for the truck traffic, drained and even. More than 'normal' fall to keep standing water away recommended.

 

[NADOR123]

Hi,

The existing coating cracked and the slab concrete cover below start cracking and popping out due to water damage (water penetrating from the top as this unloading always wet from the sludge trucks and water used to clean the unloading area)and re-bars are corroded , the slab thickness is 12".

Thank you

 

[Taconuts]

Is this area being scraped clean by a front-end loader? If so, hardly anything will prevent a coating from getting worn in a hurry. We've learned this lesson in solid waste transfer floors. Fit the loader blades with rubber cutting edges.

For rebar corrosion, you can spec epoxy coated rebar. I would also use silica fume concrete for any repours of the area. Silica fume helps to plug the interstitial space of the cement thereby densifying it and minimizing water intrusion (greatly increases the overall strength of ther concrete too). Another benefit is an actual chemical reaction to chlorides which helps to protect the steel from salt attack and corrosion. Silica fume has been used for decades on bridge construction to prevent corrosion from road salt in northern climes.