1 scope
This standard applies to industrial and
civil construction floor cushion of slag in construction operations.
2 construction preparation
2.1 materials and equipment:
2.1.1 slag: slag should not contain organic
impurities and unburned coal particle size should not be larger than 40mm
(shall not be greater than the thickness of cushion and 1/2), particle size in
the volume up to 5mm, shall not exceed the total volume of the 40%.
2.1.2 cement: use Portland cement and
ordinary Portland cement and slag Portland cement, more than its label, No.
325.
2.1.3 curing lime: 3~4d water before
application of lime powder and sieve, its size cannot be greater than 5mm.
Curing processing pulverized quicklime lime can be used, add water to dissolve
before using before use.
2.1.4 equipment: mixer, wheelbarrows, the
rolling stones or iron, (200mm, 600mm), flat spade, metering, sieve, watering
cans, paste pots, wooden clappers, 3M, and 1M long wooden poles, brooms, iron
chisel and wire brush and so on.
2.2 operating conditions:
2.2.1 structure project has been and
acceptance, and through acceptance procedures, door frames have been installed,
+50cm level elevations have been playing on the wall.
2.2.2 embedded in the cushion of electrical
pipelines and other equipment has been installed (with fine stone concrete or
cement mortar pipes embedded 1:3 tight, there is a certain value, shop to slag)
and through covert acceptance procedures.
2.2.3 pipeline has finished installation
and acceptance across the floor, floor holes with a packing density of fine
stone concrete.
2.2.4 first floor underground drainage
pipes, heating channel, heating pipes have been installed, and through covert
acceptance procedures. Finish the backfill soil, dust, and check acceptance.
3 operational processes
3.1 process:
Primary screening of slag and water
tightness →
→ find elevation, elastic cord, leveling Pier →
Grass-roots water wet, mix paving cushion
of slag slag →
→ scraping, rolling → conservation
3.1.1 base treatment: before paving cushion
of slag, cement to bond at the grass-roots level, concrete residue with an iron
chisel your chisel and wire brush and then clean with a broom, water wetter.
3.1.2 slag screening and water stuffy: slag
in using Qian must had two again screen, first again had big aperture screen,
screen aperture for 40mm, second again screen with small aperture screen,
screen hole for 5mm, main screen to fine powder, makes grain diameter 5mm and
the following of particles volume shall not over total volume of 40%, such do
makes slag has weight grain diameter and some reasonable ratio, ensure has lime
and slag of mutual role, on promote pad layer of forming and early strength improve
is favourable.
Cushion of slag or cement slag slag, no new
grounds, you must use the "old slag", the so-called "old
slag" is in deep water bored before using slag from the water network
transmission time of not less than 5d.
Cushion of cement-lime slag slag should be
cured with lime mortar or with lime-water mix bored, bored it shall not be less
than 5d.
3.1.3 for elevation, line and leveling
piers: according to +50cm level on the wall elevations and cushion thickness
design provisions (such as when there is no design, its thickness should not be
less than 80mm), measure down cushion finish elevation, and bounced around on
the wall. Then pulled horizontal wipe leveling Pier (with fine stone concrete
or cement mortar wipe into 60mmx60mm square, and pad layer with high, dang pad
layer Pu finished leveling zhihou can demolition, fill slag mix collection
material), its spacing 2m around, has pan water requirements of room, by slope
requirements pull find highest and minimum of elevation, wipe out slope Pier, used
to control pad layer of surface elevation.
3.1.4 basic sprinkler wet: cushion of slag
mixture again before laying with a broom to clean the grass-roots level,
sprinkle again (with a watering can sprinkled evenly).
3.1.5 slag mix: slag cement pad or cushion
of cement-lime slag Proportioning should comply with the design requirements.
Bored of slag by volume ratio (should be prepared measuring tool) and after a
dry mix of cement, add water, mix again, should strictly control the amount of
water, for laying cushion surfaces must not occur when bleeding phenomenon as
the principle to determine the amount of water.
Lime slag-cement mixing method as above, by
pressing the mix after mix, then add water to mix evenly.
3.1.6 laying slag mix collection material: Pu
slag Qian in grass-roots brush a pigment water mud (w/c for 0.4~0.5), will mix
collection uniform of mix collection material, from room within back with to
outside laying, virtual Pu thickness should be control in 1.3:1, for example
design requirements pad layer for 80mm, mix collection material virtual Pu
thickness for 104mm (pad layer thickness as is greater than 120mm Shi, should
layered laying, each laminated real Hou of thickness not should is greater than
virtual Pu thickness of 3/4).
3.1.7 scraping, rolling: marked by leveling
DUN, control the virtual floor thickness, roughly leveled with a spade, and
then with a wooden scraper bar to scrape, then rolled round roll (thickness
more than 20mm, the vibrating Board), and feel free to use 2m m on foot to
check smoothness and high part of the shovel, and valleys filled in. Until the
roll flat plasma so far. For walls, not around the corner, pipe rolling, wooden
clapper beating dense.
Cushion of slag cement with mixed with
paving, compaction, all operations should be controlled at 2H to complete the
process. Generally does not remain in the construction process of construction
joints, must larger such as construction joints, wooden or wood block Cha,
guaranteed straight Cha dense rub should be brushed when cement (w/c is
0.4~0.5), and then continue to spread mixture of slag.
3.1.8 conservation: cushion construction
should be carried out after the water conservation, no people trample, dirty,
its freezing rear surface construction can be carried out.
4 quality criteria
4.1 project:
4.1.1 cushion of slag using quality
materials such as cement, slag, lime, must comply with the design requirements
and the relevant provisions of the standard.
4.1.2 construction mixture ratio, Pu
pressure density should comply with the design and code for construction and
acceptance of the request.
4.1.3 slag layer and the grass-roots level,
there shall be no hollow and surface phenomena.
4.2 allowable deviation, as shown in table
7-1.
5 finished product protection
5.1 transport mix trolleys do not crash the
door frame. Pu cushion when the mixture of slag, attention must not be touch
loose solid tube of fine stone concrete, through vertical pipes must be
protected.
Cushion of slag tolerance table 7-1
Serial number item tolerance (mm) test
method
10 2m m on foot and 1 surface flatness
wedge feeler Gage check
2 elevation ± 10 use level to check
3 slope of 2/1000, and not more than 30
adjustable triangle check
4 individual small design thickness 1/10 '
check
5.2 cushion of slag pouring out, attention
should be paid to conservation at room temperature behind the 3D surface
construction.
5.3 No cushion placed on a variety of
materials, especially the paint bucket, mix mortar, so as not to affect the
bond strength and surface.
6 quality problems to be noticed
6.1 layer hollowing crack: because of the
following reasons:
6.1.1 primary debris is not clean, scrape
cement without brush, bedding layer and no watering and other, affect the bond
strength between the cushion and the grass-roots level.
6.1.2 slags contain unburned coal cinder or
slag water tightness is not.
6.1.3 tiny particles in slag (viscosity
size in 5mm and below) a larger proportion.
6.2 cushion of slag surface: mainly slag
after installation, without according to line level, and trowel the cement
after initial set, has been more difficult, must therefore be strictly operate
according to the process, the entire operation process control in 2H, rolling
check pulled level at any time in the process.
6.3 cushion loose, low intensity: the main
is in the process of mixing mixing ratio are not allowed, the whole
construction process is too long, still rolling after the initial setting,
resulting in loose cushion, cushion after pouring out, without curing the
premature human operations and other factors, leads to loose strength on the
surface.
7 quality records
This standard shall meet the following
quality records:
7.1 cement factory certificate.
7.2 slag testing certificate and test
records.
7.3 cushion of slag quality inspection and
assessment records.
No comments:
Post a Comment