Placing, finishing, curing and jointing concrete pavement finishing curing... · Placing,...
Transcript of Placing, finishing, curing and jointing concrete pavement finishing curing... · Placing,...
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Placing, finishing, curing
and jointing concrete
pavement
ASCP Forum 14 March 2016 Todd Myers Director/Owner TSM Civil Project Management
President ASCP
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TOPICS
1. Placing
2. Finishing
3. Curing
4. Jointing
PLACING, FINISHING, CURING &
JOINTING CONCRETE PAVEMENTS
ASCP Forum 14 March 2016
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1. PLACING – Mixing & Hauling
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Local premix concrete supplier (Dry mix)
Delivery in agitators
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1. PLACING – Fixed Form
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Fixed form paving
placing options
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1. PLACING – Slip form
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Concrete Dumped on Grade
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1. PLACING – Slip form
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Restricted Access – Material Transfer Placer
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1. PLACING – Slip form
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Dowels/cages – Placer Spreader
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1. PLACING – Where to Place?
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Minimise the auger/plow work. It is a paver, not a dozer
As close as possible
to its final location
For both:- slipform
- fixed-form
to minimise handling
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1. PLACING – Start of day - Caution
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Start Day ‘Transition Pour’ Length TBA
Direction of paving
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1. PLACING – End of day - Caution
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Need to cut back
into good concrete
Hand vibration of
‘Transition Lot’ in timely
manner at Start & End of
day
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2. FINISHING
Finishing: Is the process where surface marks or small localised high spots are
corrected.
This is separate activity to compaction.
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2. FINISHING
Helicopter floats
not suited to
pavements
They do not give
the right type of
surface texture
AND Curing
should have
started long ago.
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2. FINISHING – Tools & equipment
Bull float
Hand floats Wood & Steel
Scraping Straight Edge
Edging tools are not normally used at joints or edges for highway pavements
But these may be applicable for footpaths/cycle ways!
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2. FINISHING – Tools & equipment
Bull float
Short, light flat
blade, hinged for even contact
‘Float’ only
limited to closing surface marks only
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2. FINISHING – Tools & equipment
Hand Float
Use limited to minor
‘touch up’ only near
edges
basic rules :
1. Do not hand float if
not necessary
2. Use to the absolute
minimum required
If excessive required
need fix paving process
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2. FINISHING – Tools & equipment
Scraping Straight Edge
Length & weight allow
‘scrapping and filling of
pop marks or slight high
spots
About 2m (+) long
Steel angle or hollow
section, long handle
Caution - In hands of
inexperienced may
create issues
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2. FINISHING – Bleeding
Use either a bull
float or hand float in
a way that works
the surface bleed
water back into the
surface!!
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3. Finishing - Texturing
Texturing is process of producing a skid
resistance surface - Micro texture
RMS R83 Up to 80 km/h
Hessian drag (or broom)
(min 38% sand in aggregate)
Over 80 km/h (and Roundabouts)
Hessian drag (longitudinal)
+ Tyning (transverse or longitudinal)
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3. Finishing - Texturing
Produced by;
• Hessian Drag
• Broom finish
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3. Finishing – Texturing hessian
KEY points for good hessian drag texturing
Attach to work bridge or platform behind paver at right angles to paving
Double layer in contact with concrete
Minimum 0.5 m (could be =1.5m) in contact with concrete.
Avoid bunching at edges
Watch for buildup of wet or dry mortar (warm weather)
Dampen at start & Renew drag each paving day
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3. Finishing – Texturing broom
Suggested points for good broom finish
Light broom, not heavy ‘bass’ broom.
Use only dead weight of broom – don’t lean on it,
don’t ‘gouge’ surface
Straight slightly overlapping runs at right angles to
pavement
Clean broom after each pass – knock dags out,
barrow with water and shake mortar out
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3. Finishing – Tyning Hand Pours
Finished product
The tynes are long to allow
‘flat curved’ contact with
concrete
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4. CURING
What is curing?
CURING is a process of retaining moisture at a
reasonable temperature to keep the reaction between
cement and moisture going. In the first day or so if either; • Concrete completely dries out, or
• Concrete freezes The reaction stops but CANNOT be restarted !!!
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4. CURING
Curing is important for;
Strength – pavement life &
Durability - surface wear resistance
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4. CURING
Curing – Ideal conditions
Concrete laboratory.
This is perfect,
under water &
controlled
temperature
Not practical in field
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4. CURING
Two main RMS requirements for
curing membrane
a continuous unbroken film (no gaps or holes when
applied)
maintained intact for 7 days (any damage made good ) or
concrete 25 Mpa
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4. CURING
Effectiveness of curing compounds
Wax or
hydrocarbon OK
Acrylics -
check test
certificates
carefully !
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4. JOINTING
“People Breathe - Concrete Cracks”**
All we can do is control where it cracks
**Dr Manton Hall UNSW (Concrete Technology 101 – 1986)
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4. JOINTING
Typ Joints
Along – 4.2m
Across – 4.3m
Essentially
square slabs
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4. JOINTING
Typically sawing 4- 8 hours after pour, depend on; • Air temp. • Conc. Temp • Wind • Season • Sun/Shade • Etc, Etc
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4. JOINTING
Typical Saw cut width 6-7mm Crack will form 1-5 days Cleaning is very important No sealing > 7 days Joints must be dry Common Silicone Sealants
• Dow Corning 888 • Parchem Road Seal SL
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ASCP Forum 14 March 2016
PLACING, FINISHING, CURING &
JOINTING CONCRETE PAVEMENTS
Thankyou