Construction technology of fine stone concrete floor

1 scope

This technology is applicable for industrial and civil construction of fine stone concrete ground surface.

2 construction preparation

2.1 materials and equipment:

2.1.1 cement: No. 425, should be used more than Portland cement and ordinary Portland cement and slag Portland cement.

2.1.2 sand: sand, clay is less than 5%.

2.1.3 stones: coarse aggregate with a stone maximum particle size should not be greater than the thickness of the surface layer of 2/3. Fine stone concrete surface stone size should not be larger than 15mm.

2.1.4 main machinery: concrete mixers, vibrating Board, transport cart, small buckets, half a bucket, broom, 2m feet, wood iron roller, trowel, flat spade, wire brushes, chisels, hammers, iron trowel.

2.2 operating conditions:

2.2.1 interior walls have been playing +50cm horizontal lines.

2.2.2 riser through the floor has been finished, it tube hole plug the Compact. Electric pipe buried in the ground had done hidden procedures.

2.2.3 door frame has been installed and is ready to protect, on the inside door frame nailed to wooden or metal.

2.2.4 when grass-roots for precast concrete panels and joints should be filled compacting plate end cracks control measures should be taken.

3 operational processes

3.1 fine stone concrete process:

Elevation, elastic surface horizontal → base → water wet plaster cake → →

Pouring of reinforced brush grain slurry → → → → surface layer of fine stone concrete light maintenance

3.1.1 for elevation, elastic surface level: according to the +50cm horizontal height lines already on the wall, measure of ground level play on the surrounding walls, and room outside the building elevation, stairs, platforms, time echoed through consensus.

3.1.2 base treatment: first clean dust, slurry and then glued to the base skin scraping, using lye to oil brushes off, finally flush with the grass-roots level with water.

3.1.3 sprinkler wet: in surface layer on the surface of the grass-roots level the day before watering moist.

3.1.4 the plaster cake: according to pop level of surface elevations, horizontal stringing, same stone concrete mix and bean mix plaster of bread, anyway 1.5M, gray on the cake is the surface elevation above sea level.

3.1.5 reinforcement: larger room is ground to ensure smoothness and have to do muscle (or red muscle), in a gray pie as a standard bar bar, screed leveling, as criteria for casting of fine stone concrete surface layer thickness.

3.1.6 pigment slurry with coats: laying of fine stone concrete surface before, have brushes on wet grass-roots 1:0.4~0.5 (cement: water) of plain cement slurry, don't brush area is too large, you want to shop with the brush with fine stone concrete to avoid too long slurry drying causes surface layer hollowing.

3.1.7 fine stone concrete pouring:

3.1.7.1 fine stone concrete mix: fine-stone concrete surface layer strength test according to design requirements, such as when there is no requirement, shall be not less than C20, calculated by laboratories according to the raw material mix, stir the mixer, the slump should not be greater than 30mm. And according to national standards of concrete structures engineering construction and acceptance specification for the provision of concrete blocks, each layer of surface engineering of buildings should not be set less, when each layer of surface engineering construction area of over 1000m2, with each additional 1000m2 each of a set of blocks, less than 1000m2 on a 1000m2 basis. When changing the mix, should also make blocks.

3.1.7.2 surface layer fine stone concrete laying: will mixing good of fine stone concrete Pu wipe to ground grass-roots Shang (water mud combined layer to with brush with PU), shortly thereafter with 2m long scraping bar along standard reinforced scraping flat, then with drum (common of for diameter 20cm, length 60cm of concrete or iron business drum, thickness more thick Shi application flat vibration device) roundtrip, and aspect rolling, as has concave at with with tie than concrete filled, until surface layer appeared bleeding phenomenon, sub a layer dry mix cement sand (1:1= cement: sand) mix collection material And sow (grit 3mm screenings), and 2m bar leveling scraper (when you need to walk back out of the room).

3.1.8 surface layer, light:

3.1.8.1 person gray-after absorbing water, use wood trowel scrub, wipe, dry cement-sand mixture and mixing of fine stone concrete, bringing the surface layer to compact.

3.1.8.2 first time pressure: with an iron trowel and gently press it again until the pulp so far.

3.1.8.3 second time pressure: mortar after initial set, footprints on the ground surface but go when it is not sinking, second time pressure with iron trowel, smoothed pits, sand holes filled, taken not to leak.

3.1.8.4 third pressure: face to face before the final set of the mortar that people step on it a little footprints, with a trowel pressure when there is no trace of iron, iron trowel again, this time to squeeze the pressure, pattern to flatten all the calendering, reach the surface hardening of surface bright and clean.

3.1.9 conservation: surface pressure upon completion of 24h (conditional can be covered with plastic film when curing) for water conservation, not less than 2 times a day, maintenance time is generally at least not less than 7d (the room should be closed during maintenance access).

3.1.10 winter ambient temperature should not be below 5 degrees Celsius.

3.2 rough aggregate concrete ground surface layer of construction: and said once wipe light method or original pulp wipe surface method, General is in pouring concrete pad layer Shi (or pouring now poured concrete floor Shi), while will surface layer material Pu wipe in surface layer Shang at for wipe flat pressure light of operation process, such do due to grass-roots and surface layer while construction, upper and lower layer while condensation, so has combined close whole

Attempt is good, the advantages of quick construction, cement conservation, the process is: pouring concrete pad (or a concrete floor) →

Surface layer, pressure → conservation. References 3.1.7-3.1.9.

4 quality criteria

4.1 project:

4.1. materials, strength of 1 (mix) and density specification for design and construction requirements must be met:

4.1.2 combination of surface layer and the grass-roots level to be fixed, no empty drums.

4.2 Basic project:

4.2.1 pavement surface is clean, free of cracks, peeling, Matt surface and sand, and so on.

4.2.2 to drain the surface, the slope meets the design requirements, no flashing, no leakage, no water retention, and a floor drain (pipe) with tight smooth.

4.2.3 edge where it touches the edge of the surface material and dimensions comply with the specification for design and construction requirements.

4.3 allowable deviation, as shown in table 7-4.

Cement concrete pavement allows tables to be errors and the test method 7-4

Serial number item tolerance (mm) test method

1 5 2m surface flatness on foot and wedged feeler Gage check

2 sew Geping straight 3 la 5M, less than 5M Latrun line and length check

5 finished product protection

5.1 in the process, pay attention to grey two-wheeled delivery vehicles shall not be damaged door frames and laying of pipeline at the grassroots level.

5.2 surface pressure at any time during the erase footprints, and closed all the pathways through the operating room.

5.3 surface laminated light let's give the conservation process, closed the door and access, there shall be no other types of operation to avoid phenomena of surface sand.

5.4 the conservation time meets the requirements you can master operation, preventing hard to scratch the ground and prevent pollution of the surface layer in the paint process.

6 quality problems to be noticed

6.1 layer of sand, skin: due to lack of cement grade or use cement, large ratio pressure enough, curing premature during other procedures, could easily lead to sand. Sprinkle dry cement in the process (sub-sand-cement mixture) is uneven, thick and thin, an uneven cement layer formed on the surface, does not combine well with concrete, can cause surface from the skin. If there is bleeding, immediately sprinkle sand-cement (1:1= cement: sand) dry mix, and uniform, thick, wooden trowel rubbed to hard pavement and concrete are combined together into a whole.

6.2 layer hollowing and crack: grassroots as a shop before fine stone concrete is not clean, such as cement and oil, or brush cement bonding area is too large with a broom swept, dumped pulp and so easily lead to surface air drums. Due to the slump of the concrete is too large rolling back too much water, and sprinkle dry mix has not been completed before the final set after pressing process, resulting in surface layer structure is not close easy to crack.

6.3 layer lines, not only: iron trowel pressure a few times mainly due to insufficient or let's give too early last time pressure when pressure evenly, wipe pattern pressure pressure.

7 quality records

This standard shall meet the following quality records:

7.1 cement factory certificate and retest data form.

7.2 in-situ concrete block pressure test records.

7.3 ground-surface engineering quality checking and evaluation form.