The Publick Works peoples of our fair Citie are engaged in a project to bring on-street parking management into the 21st century. Two pay stations per block, and you go look at the number of your parking space stuck to the curb and go pay the freight at the high tech "we takes credit/debit currency/coin" technorobot sentinel that silently stands guard through rain, sleet, snow, and dark of night.
So we have these 18th century granite curbs all bumpy and knobby on top that just happened to unfortunately find themselves in the local historic overlay district, sadly next to a grass strip so they can't stick them to the sidewalk next to the curb.
Seems that our stiff self-sticking plastic numbers that we stick on don't stick so good to bumpy knobby and we need to make us a nice smooth patch to stickem to. So they have proposed the use of SikaTop® 122 PLUS to schmear on the bumpy granite and build up a thin, smooth-topped plinth to which they can stick the numbers.
The question arises as to reversibility.
"a certified historical restoration company out of Charlotte that specializes in restoring cemeteries and heritage stone buildings in many states. ... The company has assured that this material dries in much the same grayish color as granite, is harder than granite, finishes beautifully and can be removed easily with a few specially-placed chisel strokes without any damage to the curb."
And this:
"1. 28 days to cure to full strength.
"2. It does not continue to harden over time.
"3. May be some residual that can easily be brushed off, no discoloration.
"4. Hand chisel only in 1' to 2' [sic, probably meant inches] incriments."
What's your thinking on this? Much ado about nothing, or problems down the road when they decide to go with the next latest greatest system and we have 150 useless blobs on top of the curbs.
Excerpts from the product sheet below:
SikaTop® 122 PLUS
Two-component, polymer-modified, cementitious, trowel-grade
mortar plus FerroGard 901 penetrating corrosion inhibitor
SikaTop 122 PLUS is a two-component, polymer-modified, portland-cement, fast-setting, trowel-grade mortar. It is a high performance repair mortar for horizontal and vertical surfaces and offers the additional benefit of FerroGard 901, a penetrating corrosion inhibitor.
Where to Use
n On grade, above, and below grade on concrete and mortar.
n On horizontal surfaces.
n As a structural repair material for parking structures, industrial plants, walkways, bridges, tunnels, dams, and ramps.
n To level concrete surfaces.
n As an overlay system for topping/resurfacing concrete.
n Overlay in cathodic protection systems.
Advantages
n High compressive and flexural strengths.
n High early strengths. Opens to traffic fast: foot in 4-6 hours, pneumatic tire in 8-12 hours.
n High abrasion resistance.
n Increased freeze/thaw durability and resistance to deicing salts.
n Compatible with coefficient of thermal expansion of concrete - Passes ASTM C-884 (modified).
n Increased density - improved carbon dioxide resistance (carbonation) without adversely affecting water vapor transmission (not a vapor barrier).
n Enhanced with FerroGard 901, a penetrating corrosion inhibitor - reduces corrosion even in the adjacent concrete.
n Not flammable, non-toxic.
n Conforms to ECA/USPHS standards for surface contact with potable water.
n USDA approved for food industry.
n ANSI/NSF Standard 61 potable water approved.
Application & Finish
SikaTop 122 PLUS must be scrubbed into the substrate, filling all pores and voids. Force material against edge of repair, working toward center. After filling repair, consolidate, then screed. Allow mortar or concrete to set to desired stiffness, then finish with wood or sponge float for a smooth surface, or broom or burlap-drag for a rough finish.
Limitations
Application thickness:
Min. Max. in one lift
Neat 1/8 inch (3 mm) 1 inch (25 mm)
Extended 1 inch (25 mm) 4 inches (100 mm)
n Minimum ambient and surface temperatures 45°F (7°C) and rising at time of application.
n Addition of coarse aggregates may result in variations of the physical properties of the mortar.
n Do not use solvent-based curing compound.
n Size, shape and depth of repair must be carefully considered and consistent with practices recommended by ACI. For additional information, contact Technical Service.
n For additional information on substrate preparation, refer to ICRI Guideline No.03732 Coatings, and Polymer Overlays.
n If aggressive means of substrate preparation is employed, substrate strength should be tested in accordance with ACI 503 Appendix A prior to the repair application.
n As with all cement based materials, avoid contact with aluminum to prevent adverse chemical reaction and possible product failure. Insulate potential areas of contact by coating aluminum bars, rails, posts etc. with an appropriate epoxy such as Sikadur Hi-Mod 32.
_____________________________________
Dan Becker, Division Manager
City & Regional Planning Division
Raleigh Department of City Planning
One Exchange Plaza, Ste 300 (27601)
PO Box 590, Raleigh NC, 27602
919/516-2632 (v); 919/516-2682 (f)
http://www.raleighnc.gov
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**Please remember to trim posts, as requested in the Terms of Service**
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