CN109162460A - A kind of construction method of C70 self-compacting concrete - Google Patents
A kind of construction method of C70 self-compacting concrete Download PDFInfo
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- CN109162460A CN109162460A CN201811066877.5A CN201811066877A CN109162460A CN 109162460 A CN109162460 A CN 109162460A CN 201811066877 A CN201811066877 A CN 201811066877A CN 109162460 A CN109162460 A CN 109162460A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
Abstract
The present invention provides a kind of construction methods of C70 self-compacting concrete, comprising the following steps: C70 self-compacting concrete is poured steel pipe by high dropping method, is vibrated using placement layer by layer, every layer 1-1.5 meters, pours one layer, is vibrated one layer.Concrete in steel core concrete column can be poured disposably by high dropping method and be finished by construction method provided herein, can reduce process links, reduced labor intensity, accelerated construction progress.The defects of because of steel column therein design feature, inside concrete air is discharged in tube wall by vibrating, and can effectively avoid steel pipe column interior concrete leakiness, concrete and steel pipe wall there are gaps, it is ensured that concrete quality meets design requirement.
Description
Technical field
The present invention relates to technical field of buildings, in particular to a kind of construction method of C70 self-compacting concrete.
Background technique
Steel Pipe Concrete Bearing Capacity is high, plasticity and good toughness, convenient and quick construction and remarkable in economical benefits, referred to as native
The fifth-largest structural system in wood engineering, in recent years in high-level structure and large-span structure using more, but instillation process and vibration
Smashing technique is always its construction Difficulties and research hotspot.
Currently, more research units, which all facilitate the preparation of its core concrete material, has carried out a series of research work
Make, achieves some effects, and be applied to engineering practice.But strength grade generally is C50, or has higher intensity, past
Toward Vibration Technology can not used, it is difficult to ensure that concrete filled steel tube is closely knit.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first object of the present invention is to provide a kind of construction method of C70 self-compacting concrete, to solve the above problems,
The construction method, when pouring, the kinetic energy that is fallen from high-altitude along steel pipe using concrete and being aided with manually is vibrated, to reach
The purpose of concrete compaction.And in steel duct reasonable Arrangement temperature measuring point, steel pipe inner concrete temperature is monitored, is sprinkled water in time
Maintenance prevents steel column inner concrete from disengaging because of concrete caused by temperature shrinkage and steel pipe inner wall.
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
A kind of construction method of C70 self-compacting concrete, comprising the following steps:
C70 self-compacting concrete is poured into steel pipe by high dropping method, is vibrated using placement layer by layer, every layer 1-1.5 meters,
One layer is poured, is vibrated one layer；
Preferably, the time interval between pouring for every two layers is 10~15min；
Preferably, described pour is operated by concrete pump.
Preferably, the process vibrated, specifically includes the following steps:
Vibrating spear is inserted perpendicularly into concrete, and insertion depth will reach 5~10cm in next layer concrete, every layer vibrate to
Concrete surface is concordantly no longer decreased obviously, and bubble no longer occurs, until surface glows mortar.
Preferably, the C70 self-compacting concrete is before pouring, and by stirring, the speed of the stirring is 3-6r/min.
Preferably, before described the step of pouring, further includes: concrete enters the step of mould carries out temperature measuring；Specifically
Include: by concreting in a mold, the thermometric time be 14 days, 1~4 day after the completion of concreting, every 2h thermometric is primary；
5~7 days, every 4h thermometric was primary；8~14 days, every 12h thermometric was primary；
It is furthermore preferred that mold internal-external temperature difference is less than 20 DEG C after the thermometric.
Preferably, before described the step of pouring, to the factory temperature of concrete and enter pump temperature and control；More preferably
, factory temperature≤30 DEG C, it is described enter pump temperature≤35 DEG C.
Preferably, it is described pour the step of vibrating after, further includes: concrete is conserved using water storing conservation method；
It is furthermore preferred that the time of the maintenance is greater than 14 days.
Preferably, the concrete is made of cementitious material, basalt, water, sand and water-reducing agent；
It is furthermore preferred that the water-reducing agent is polycarboxylate water-reducer, it is furthermore preferred that the quality of the polycarboxylate water-reducer is institute
State the 2%-6% of cementitious material, preferred 2%-4%；It is furthermore preferred that the water-reducing rate of the polycarboxylate water-reducer 28% with
On.
Preferably, the cementitious material is by flyash, miberal powder and cement composition；It is furthermore preferred that the volume of the miberal powder is
60-80kg/m3, 60-70kg/m still more preferably3；
It is furthermore preferred that the specific surface area of the miberal powder is greater than 400m2/kg；
It is furthermore preferred that the volume 40-60kg/m of the flyash quality3, 40-50 kg/m still more preferably3；
It is furthermore preferred that the specific surface area of the flyash is greater than 400m2/ kg is still more preferably 400-420m2/kg。
It is furthermore preferred that the additive amount of the cement is 440-460kg/m3, it is still more preferably 440-450kg/m3；More
Preferably, the 28d intensity of the cement is not less than 50MPa；
It is furthermore preferred that the basaltic additive amount is 1000-1200kg/m3, 1100- still more preferably
1150kg/m3；
It is furthermore preferred that the basaltic partial size is 5-20mm；
It is furthermore preferred that basaltic water absorption rate≤2%, flat-elongated particles content≤5%, crush index≤7%.
Preferably, the additive amount of the sand is 560-600kg/m3, preferred 580-600kg/m3。
The construction method of the C70 self-compacting concrete suitable for strength grade of concrete C60 or more, leaves height
The construction that the Steel Pipe Column core concrete pumping of 3m or less, diameter 1.2m or less, internal structure complexity leave.
Compared with prior art, the invention has the benefit that
(1) construction method provided herein can disposably be thrown the concrete in steel core concrete column by high-order
The method of falling, which pours, to be finished, and process links can be reduced, and is reduced labor intensity, is accelerated construction progress.
(2) construction method provided herein, because of steel column therein design feature, by vibrating, coagulation is discharged in tube wall
Native inner air, the defects of can effectively avoid steel pipe column interior concrete leakiness, concrete and steel pipe wall there are gaps, it is ensured that mixed
Solidifying soil property amount meets design requirement.
(3) construction method provided herein, when carrying out mix-design using quality is hard, gradation is good, and
The lesser basalt of water absorption rate replaces traditional rubble, guarantees that can be effectively controlled concrete factory while concrete strength collapses
Degree.
(4) construction method provided herein, it is inside and outside after concreting since engineering steel column section itself is larger
The temperature difference is larger, thermal cracking, therefore the rational deployment temperature measuring point inside steel pipe column easily occurs, effectively controls steel column column core concrete
Internal-external temperature difference.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is temperature measuring point arrangement schematic diagram provided in an embodiment of the present invention；
Fig. 2 is longitudinal temperature measuring point arrangement schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with the drawings and specific embodiments, but
Be it will be understood to those of skill in the art that it is following described embodiments are some of the embodiments of the present invention, rather than it is whole
Embodiment is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.Based on the embodiments of the present invention, ability
Domain those of ordinary skill every other embodiment obtained without making creative work, belongs to guarantor of the present invention
The range of shield.The person that is not specified actual conditions in embodiment, carries out according to conventional conditions or manufacturer's recommended conditions.Agents useful for same
Or production firm person is not specified in instrument, is the conventional products that can be obtained by commercially available purchase.
Embodiment 1
(1) scene prepares
Before steel pipe column concreting, steel column internal water accumulation should be cleared up, and complete pump line laying, heat insulation foam quilt
It is laid with, to prevent from hitting isolation in concrete dropping process with steel pipe post jamb and internal partition, pump line discharge port needs vertical center to protrude into
In steel pipe, concrete vertical drop in cavity is enabled.In addition reasonable Arrangement temperature measuring point (as illustrated in fig. 1 and 2) inside steel pipe column.
It needs first to be measured the concrete molding temperature at scene before concreting.3d after the completion of concreting
Concrete internal temperature reaches highest, and the concrete plan thermometric time is 14d, 1d after the completion of concreting, every 2h thermometric one
It is secondary；5d, every 4h thermometric are primary；8d, every 12h thermometric are primary.According to the temperature measurement data of concrete, the water storage of concrete surface is adjusted
Depth.It is required that internal-external temperature difference is less than 20 DEG C after thermometric.
(2) concrete outgoing controls
(a) proportion of concrete, as shown in table 1, property is as shown in table 2.
1 concrete material of table composition
2 working performance of concrete of table
C70 high-strength concrete adiabatic temperature rise is estimated up to 50 DEG C, and it is big to pour component volume, therefore easily causes internal temperature
Degree is high, and internal-external temperature difference is big.To prevent thermal cracking from generating, needing strict control factory concrete and entering to pump concrete temperature, wherein
Factory concrete temperature≤30 DEG C, enter to pump concrete temperature≤35 DEG C.Aggregate is prevented to be exposed to the sun, if aggregate temperature is high, feed bin is equipped with
Spray equipment can also cool down for aggregate, the mixture water in addition used, using existing pumping underground water, water temperature is constant, if any must
Will be on the rocks into water, reduce water temperature.
(b) high-strength concrete cementitious material is more, and the ratio of mud is low, and concrete mix viscosity is larger, when need to extend stirring
Between, it is ensured that each component material is evenly distributed, so that it is guaranteed that the uniformity and workability of mixture.
(c) factory C70 concrete per car is both needed to be carried out to go out after workability detection meets the requirements as required by Quality Inspector
Factory.
(3) it transports and pours
(a) agitator truck must drain agitator tank internal water accumulation before charging, forbid after charging again into agitator tank
Add water in concrete mix.
(b) concrete mixer truck should keep transport vehicle roller by 3~r/min low speed rotation in charging and transportational process
It is dynamic, the uniformity of concrete mix is kept, does not generate layering, segregation phenomenon, forbids to add in transport and waiting discharge process
Water
(c) high speed rotation 60s is answered before agitator truck discharging, then is discharged into concrete pump, so that concrete is in best work
Make state, is conducive to the molding of concrete self-compaction.
(d) it answers technology to pour after concrete mix is transported to scene, special messenger is sent to carry out workability to concrete before pouring
It checks, isolation or the big concrete of liquidity value added are resolutely refused can be carried out and be poured.
Though (e) this steel pipe column belongs to self-compacting concrete using C70 high-strength concrete, still needs to auxiliary and vibrate conducive to discharge
Inside concrete air, and increase the mobility and density of concrete, auxiliary is vibrated when vibrating using placement layer by layer, and every layer
1m pours one layer, vibrates one layer, and every layer pours interval time as 10min, and special messenger is needed to observe, and avoids the occurrence of over vibration, causes to mix
Solidifying soil laminated segregation or laitance are excessive.Vibrating spear should be inserted perpendicularly into concrete, to be inserted and be pulled out slowly fastly, vibrating spear should be inserted into next layer
5cm in concrete.
Because steel pipe column is rectangle, and it is interior have a partition distribution, therefore the method that should be vibrated using center, and must not leakage.It manages simultaneously
Artificial mallet should be cooperated to tap outside, judge whether concrete is closely knit according to sound, every layer vibrates to concrete surface concordantly no longer
It is decreased obviously, bubble no longer occurs, until surface glows mortar.
(4) steel pipe column concrete curing
(a) steel column inner concrete preferably uses water storing conservation method to be conserved after the completion of pouring, clear in concrete surface perfusion
Water, curing water are normal-temperature water.
(b) it should forbid directly to wash away concrete surface with water pipe when water storage, should be responsible for placing water into bucket in advance by special messenger
In, when pouring the concrete initial set at finished surface and being near completion, the side that is slowly poured using plastic bottle or watered with dipper
Formula carries out water filling moist curing.
(c) curing time must not be less than 14d.
(d) it needs to arrange special messenger's not timing and watering cooling processing is carried out to steel column outer wall, guarantee that temperature difference between inside and outside concrete exists
In zone of reasonableness.
(5) safety measure: when using the construction of this engineering method, in addition to it should execute related safe construction and environmental protection measure regulation, still
It should abide by and pay attention to following item:
(a) construction worker have to be understood that and grasp the technical operation main points of this technique, special work post (such as delivery pump
Operator, electric welder etc.) it should take appointment with certificate.
(b) before concreting, should stringing to steel pipe column bracket, delivery pipe and connector etc. check that concrete is defeated
Pump is sent to carry out the work that can be switched on after test running is normal.
(c) in concreting process, forbid the people that stands under concrete pump cantilever crane.
(d) when being aided with artificial vibrate to steel column concrete, the job platform of Build Security is answered.
(6) environmental protection measure
(a) Measures on Noise Control of concrete pump, concrete delivery truck is formulated, site road wants smooth unimpeded,
Guarantee concrete pump, concrete delivery truck even running.
(b) concrete delivery truck should clear up lower hopper before appearing on the scene, and prevent concrete drop from spilling, can be from after service rack carwash
?.
(c) sewage for cleaning transport vehicle should can be discharged into municipal wastewater pipeline or recycling is used after catch pit and sedimentation basin
In watering and lowering dust.
(c) the remaining concrete in construction site will be cleared up in time, be put into designated place and handled.
Embodiment 2
Unlike the first embodiment:
In step (1), need first to be measured the concrete molding temperature at scene before concreting.Generally in coagulation
4d concrete internal temperature reaches highest after the completion of soil pours, and the concrete plan thermometric time is 14d, after the completion of concreting
4d, every 2h thermometric are primary；7d, every 4h thermometric are primary；14d, every 12h thermometric are primary.According to the temperature measurement data of concrete, adjustment
The water-storage depth of concrete surface.It is required that internal-external temperature difference is less than 20 DEG C after thermometric.
In step (2), the proportion of (a) concrete, as shown in table 3, property is as shown in table 4.
3 concrete material of table composition
4 working performance of concrete of table
In step (3), (b) concrete mixer truck should keep transport vehicle roller by 6r/min in charging and transportational process
Slowly run, keep the uniformity of concrete mix, do not generate layering, segregation phenomenon, forbids transporting and waiting discharging
Add water in journey.
(c) high speed rotation 90s is answered before agitator truck discharging, then is discharged into concrete pump, so that concrete is in best work
Make state, is conducive to the molding of concrete self-compaction.
Though (e) this steel pipe column belongs to self-compacting concrete using C70 high-strength concrete, still needs to auxiliary and vibrate conducive to discharge
Inside concrete air, and increase the mobility and density of concrete, auxiliary is vibrated when vibrating using placement layer by layer, and every layer
1m pours one layer, vibrates one layer, and every layer pours interval time as 15min, and special messenger is needed to observe, and avoids the occurrence of over vibration, causes to mix
Solidifying soil laminated segregation or laitance are excessive.Vibrating spear should be inserted perpendicularly into concrete, to be inserted and be pulled out slowly fastly, vibrating spear should be inserted into next layer
10cm in concrete.
Remaining step is identical.
Embodiment 3
Unlike the first embodiment:
In step (1), need first to be measured the concrete molding temperature at scene before concreting.Generally in coagulation
4d concrete internal temperature reaches highest after the completion of soil pours, and the concrete plan thermometric time is 14d, after the completion of concreting
2d, every 2h thermometric are primary；6d, every 4h thermometric are primary；10d, every 12h thermometric are primary.According to the temperature measurement data of concrete, adjustment
The water-storage depth of concrete surface.It is required that internal-external temperature difference is less than 20 DEG C after thermometric.
In step (2), the proportion of (a) concrete, as shown in table 5, property is as shown in table 6.
5 concrete material of table composition
6 working performance of concrete of table
In step (3), (b) concrete mixer truck should keep transport vehicle roller by 4r/min in charging and transportational process
Slowly run, keep the uniformity of concrete mix, do not generate layering, segregation phenomenon, forbids transporting and waiting discharging
Add water in journey.
(c) high speed rotation 70s is answered before agitator truck discharging, then is discharged into concrete pump, so that concrete is in best work
Make state, is conducive to the molding of concrete self-compaction.
Though (e) this steel pipe column belongs to self-compacting concrete using C70 high-strength concrete, still needs to auxiliary and vibrate conducive to discharge
Inside concrete air, and increase the mobility and density of concrete, auxiliary is vibrated when vibrating using placement layer by layer, and every layer
1m pours one layer, vibrates one layer, and every layer pours interval time as 12min, and special messenger is needed to observe, and avoids the occurrence of over vibration, causes to mix
Solidifying soil laminated segregation or laitance are excessive.Vibrating spear should be inserted perpendicularly into concrete, to be inserted and be pulled out slowly fastly, vibrating spear should be inserted into next layer
7cm in concrete.
Remaining step is identical.
Embodiment 4
Unlike the first embodiment:
In step (1), need first to be measured the concrete molding temperature at scene before concreting.Generally in coagulation
3d concrete internal temperature reaches highest after the completion of soil pours, and the concrete plan thermometric time is 14d, after the completion of concreting
3d, every 2h thermometric are primary；6d, every 4h thermometric are primary；12d, every 12h thermometric are primary.According to the temperature measurement data of concrete, adjustment
The water-storage depth of concrete surface.It is required that internal-external temperature difference is less than 20 DEG C after thermometric.
In step (2), the proportion of (a) concrete, as shown in table 7, property is as shown in table 8.
7 concrete material of table composition
8 working performance of concrete of table
In step (3), (b) concrete mixer truck should keep transport vehicle roller by 5r/min in charging and transportational process
Slowly run, keep the uniformity of concrete mix, do not generate layering, segregation phenomenon, forbids transporting and waiting discharging
Add water in journey.
(c) high speed rotation 80s is answered before agitator truck discharging, then is discharged into concrete pump, so that concrete is in best work
Make state, is conducive to the molding of concrete self-compaction.
Though (e) this steel pipe column belongs to self-compacting concrete using C70 high-strength concrete, still needs to auxiliary and vibrate conducive to discharge
Inside concrete air, and increase the mobility and density of concrete, auxiliary is vibrated when vibrating using placement layer by layer, and every layer
1m pours one layer, vibrates one layer, and every layer pours interval time as 12min, and special messenger is needed to observe, and avoids the occurrence of over vibration, causes to mix
Solidifying soil laminated segregation or laitance are excessive.Vibrating spear should be inserted perpendicularly into concrete, to be inserted and be pulled out slowly fastly, vibrating spear should be inserted into next layer
9cm in concrete.
Remaining step is identical.
Application Example
About 2,000,000 square metres of the Urumchi city Bao Neng project overall floorage, building height is up to 300 meters or more.Top knot
Structure is concrete-filled steel tubular frame structure.Steel pipe column is divided into round and box-shaped by section, and tubular pillar meter 22, specification is Φ 800mm
~1600mm；Box column meter 22, maximum cross-section is 1300mm × 1900mm；The absolute altitude of column is out of -23.2~284.15, column
Concreting amount is up to 24.6m3, minimum 1.2m3。
C70 steel pipe column high-strength concrete project is adopted for the problems such as steel duct is structure special-shaped, high-strength concrete viscosity is big
Steel Pipe Column core concrete, equal one-time-concreting to designed elevation are poured with high dropping construction technology.Every steel pipe column concrete
Pour the time at 20~30 minutes, do not occur abnormal phenomenon.After the completion of pouring, column is checked using the method for tapping steel pipe wall
The density and contraction situation of core concrete, do not find hollowing phenomenon；This engineering method obtains in the engineering of the Urumqi City city Bao Neng
Using the blank of Xinjiang region in this field has been filled up in the breakthrough for the first time of realization C70 steel pipe column High Strength Concrete Construction.
Experimental example steel column Concrete Strength Evaluation
After steel column concreting, steel column inner concrete intensity can not be detected, therefore in steel column concrete
Pour in test in advance, the testing column in pouring in advance cut and core boring sampling, sent when core sample respectively reaches 7d, 28d to
Third party detects unit and carries out steel column detection and evaluation of concrete strength, and third party, which detects unit, should have the examination of high-strength concrete pressure
Machine is tested, guarantees the accuracy of steel column Concrete Strength Evaluation, the steel column concrete cut need to separately be returned pouring scene
The detection of bullet method.After concrete filled steel tube cutting, there is no de- cylinder phenomenon, concrete is tightly combined with steel column, concrete mix
Well.
And the concrete of comparative example and the embodiment of the present application 1 using same component, same construction technology, just with mixed
The kinetic energy that solidifying soil falls from high-altitude along steel pipe, does not use and is aided with the step of manually vibrating, the results showed that, comparative example steel column coagulation
Native intensity detection is not up to standard, and has de- cylinder and crack phenomenon.
In conclusion construction method provided herein, can disposably pass through the concrete in steel core concrete column
High dropping method, which pours, to be finished, and process links can be reduced, and is reduced labor intensity, is accelerated construction progress.Because of steel column therein knot
Structure feature, by vibrate tube wall be discharged inside concrete air, can effectively avoid steel pipe column interior concrete leakiness, concrete with
Steel pipe wall the defects of there are gaps, it is ensured that concrete quality meets design requirement.It is hard using quality when carrying out mix-design
Firmly, gradation is good, and the lesser basalt of water absorption rate replaces traditional rubble, guarantees to can be effectively controlled while concrete strength mixed
The solidifying soil factory slump.Since engineering steel column section itself is larger, internal-external temperature difference is larger after concreting, temperature easily occurs
Crack, therefore the rational deployment temperature measuring point inside steel pipe column effectively control steel column column core concrete internal-external temperature difference.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that the above various embodiments is only used
To illustrate technical solution of the present invention, rather than its limitations；Those skilled in the art should understand that: without departing substantially from this hair
It in the case where bright spirit and scope, is possible to modify the technical solutions described in the foregoing embodiments, or to wherein
Some or all of technical characteristic is equivalently replaced；And these are modified or replaceed, and do not make the essence of corresponding technical solution
It departs from the scope of the technical solutions of the embodiments of the present invention；It is, therefore, intended that in the following claims including belonging to the present invention
All these substitutions and modifications in range.
Claims (10)
1. a kind of construction method of C70 self-compacting concrete, which comprises the following steps:
C70 self-compacting concrete is poured into steel pipe by high dropping method, is vibrated using placement layer by layer, every layer 1-1.5 meters, is poured
It one layer, vibrates one layer；
Preferably, the time interval between pouring for every two layers is 10~15min；
Preferably, described pour is operated by concrete pump.
2. the construction method of C70 self-compacting concrete according to claim 1, which is characterized in that the process vibrated,
Specifically includes the following steps:
Vibrating spear is inserted perpendicularly into concrete, and insertion depth will reach 5~10cm in next layer concrete, and every layer vibrates to coagulation
Native flush is no longer decreased obviously, and bubble no longer occurs, until surface glows mortar.
3. the construction method of C70 self-compacting concrete according to claim 1, which is characterized in that the C70 self-compaction is mixed
Solidifying soil is before pouring, and by stirring, the speed of the stirring is 3-6r/min.
4. the construction method of C70 self-compacting concrete according to claim 1, which is characterized in that in the step poured
Before rapid, further includes: concrete enters the step of mould carries out temperature measuring；
Specifically include: in a mold by concreting, the thermometric time is 14 days, 1~4 day after the completion of concreting, every 2h
Thermometric is primary；5~7 days, every 4h thermometric was primary；8~14 days, every 12h thermometric was primary；
Preferably, after the thermometric, mold internal-external temperature difference is less than 20 DEG C.
5. the construction method of C70 self-compacting concrete according to claim 1, which is characterized in that described the step of pouring
Before, to the factory temperature of concrete and enter pump temperature and control；
Preferably, factory temperature≤30 DEG C, it is described enter pump temperature≤35 DEG C.
6. the construction method of C70 self-compacting concrete according to claim 1, which is characterized in that described pour is vibrated
After step, further includes: conserved to concrete using water storing conservation method；
Preferably, the time of the maintenance is greater than 14 days.
7. the construction method of C70 self-compacting concrete according to claim 1, which is characterized in that the concrete is by glue
Gel material, basalt, water, sand and water-reducing agent composition；
Preferably, the water-reducing agent is polycarboxylate water-reducer；
Preferably, the quality of the polycarboxylate water-reducer is the 1.8%-3.0%, preferred 2.0%- of the cementitious material
2.5%；
Preferably, the water-reducing rate of the polycarboxylate water-reducer is 28% or more.
8. the construction method of C70 self-compacting concrete according to claim 7, which is characterized in that the cementitious material by
Flyash, miberal powder and cement composition；
Preferably, the volume of the miberal powder is 60-80kg/m3, preferred 60-70kg/m3；
It is furthermore preferred that the specific surface area of the miberal powder is greater than 400m2/kg；
Preferably, the volume 40-60kg/m of the flyash quality3, preferred 40-50kg/m3；
It is furthermore preferred that the specific surface area of the flyash is greater than 400m2/ kg is still more preferably 400-420m2/kg；
Preferably, the additive amount of the cement is 440-460kg/m3, more preferably 440-450kg/m3；
It is furthermore preferred that the 28d intensity of the cement is not less than 50MPa；
Preferably, the basaltic additive amount is 1000-1200kg/m3, preferred 1100-1150kg/m3；
Preferably, the basaltic partial size is 5-20mm；
Preferably, basaltic water absorption rate≤2%, flat-elongated particles content≤5%, crush index≤7%.
9. the construction method of C70 self-compacting concrete according to claim 7, which is characterized in that the additive amount of the sand
For 560-600kg/m3, preferred 580-600kg/m3。
10. the construction method of -9 described in any item C70 self-compacting concretes according to claim 1 is suitable for concrete strength
Grade C60 or more, the Steel Pipe Column core concrete pumping for leaving height 3m or less, diameter 1.2m or less, internal structure complexity are thrown
The construction fallen.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113684744A (en) * | 2021-09-14 | 2021-11-23 | 中铁十一局集团桥梁有限公司 | Pouring and curing method for C100 concrete |
| CN113832855A (en) * | 2020-06-23 | 2021-12-24 | 东南大学 | Construction method of large-diameter steel pipe arch concrete |
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| CN113684744A (en) * | 2021-09-14 | 2021-11-23 | 中铁十一局集团桥梁有限公司 | Pouring and curing method for C100 concrete |
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Application publication date: 20190108 |