Problems Associated with - Paving Direct · 2019-02-20 · Problems Associated with Concrete...
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www.pavingdirect.com Problems Associated with Concrete Paving
Transcript of Problems Associated with - Paving Direct · 2019-02-20 · Problems Associated with Concrete...
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Problems Associated with Concrete Paving
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INDEX
Section 1 Differential Weathering
Section 2 Efflorescence
Section 3 Air Holes
Section 4 Salt
Section 5 Manhattan & Kera Linea - General Care
Problems Associated with Concrete Paving
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Possible Causes
Differential weathering is caused by varying moisturemovement in the early curing process. The darker areasrepresent the moisture cured parts of the surface, andthese are usually in the centre of the slab as theproduction technique can sometimes inhibit uniformsurface drying.
Other causes of differential weathering:
Packaging – subjects the paving units to sweating withinthe pack.
Atmospheric conditions – the weather can affect thepaving in its early curing process and when newly laid.
Paving laid on the spot bed method causes voids whichcan contribute to the drying out/curing process resultingin patches.
The appearance of a slab affected by differentialweathering can sometimes give the impression that theconcrete surface is flaking, which is not the case. Theperceived flaking effect is purely the shade differentialbetween area of the concrete surface which have beensubjected to the varying moisture conditions during theproducts early curing process.
DIFFERENTIAL WEATHERING 1
Solution
The effects are not detrimental to the product and notusually permanent and will become less apparent withnatural weathering and with the passage of time.
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Possible Causes
Efflorescence is a natural phenomenon that can occur inany concrete product and does tend to disappear withthe passage of time and natural weathering.
Efflorescence is known as ‘lime bloom’ and broughtabout as the result of the normal chemical reactionbetween cement and water. When it is wet, the depositbecomes transparent and seemingly disappears. Theoccurrence of efflorescence is spasmodic andunpredictable but forms more readily when concretebecomes wet and dries slowly and therefore, occursmore frequently in the winter.
Solutions
Although there are efflorescence cleaners on the market,these can be a temporary solution. Be assured thatefflorescence will generally disappear with naturalweathering and time.
EFFLORESCENCE 2
Photo also shows spot bedding.
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Possible Causes
Mainly occur during the manufacture of wet-cast pavingslabs.
Solution
Generally air holes/pin holes in concrete are small andnot detrimental to the future performance of the paving.
AIR HOLES 3
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SALT
Possible Causes
The break-up of paving surfaces can be due to the useof rock salt, which is generally applied on pathways oraccess routes. Rock salt should not be used on concretepaving and we state this in our brochure and on ourwebsite, most suppliers of rock salt will also state it’sunsuitability for the use on concrete and asphalt roadsand pathways.
The detrimental effects of rock salt use can be seenclearly over recent heavy winters with the appearance ofthe unprecedented number of pot-holes on roads acrossthe country.
Solution
Once applied there are no resolutions, although withoutthe further use of salt paving should not deteriorate any more, and in future winters the use of grit isrecommended.
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Manhattan and Kera Linea have a 10 year guarantee,however, they are not self-cleaning and still need to bemaintained and looked after.
Prior to laying the paving should be handled with careand stacked face to face.
Use furniture feet on tables and chairs to protect againstmarking the paving.
Cleaning products recommended:
Every day cleaning – soapy water, broom or mop.
Deep clean – Lithofin Power Clean
Scratch repair kits are available.
MANHATTAN & KERA LINEA 5
