CN106082818A - Concrete and making, construction method - Google Patents
Concrete and making, construction method Download PDFInfo
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- CN106082818A CN106082818A CN201610427758.2A CN201610427758A CN106082818A CN 106082818 A CN106082818 A CN 106082818A CN 201610427758 A CN201610427758 A CN 201610427758A CN 106082818 A CN106082818 A CN 106082818A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
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- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A kind of concrete and making, construction method, belong to bridge field.Concrete is mainly made by following components by weight: cement 1～3 parts；Sand 1～2 parts；Rubble 1.8～3 parts；Water 0.2～0.5 part；Polycarboxylate dehydragent 0.01～0.03 part.The modulus of fineness of sand is 2.5～3.0；The particle diameter of the rubble of 30wt% is 5～10mm, and the particle diameter of the rubble of 70wt% is 5～25mm.In this concreting process, the maximum temperature in concrete less than 60 DEG C, the presetting period more than 8 hours, final setting time be not more than 12 hours.By the form of construction work of thin concrete lift, and control the placing temperature of concrete, the problem that Temperature Cracks occurs in concrete can be avoided.
Description
Technical field
The present invention relates to bridge field, in particular to a kind of concrete and making, construction method.
Background technology
Bowstring arch bridge is the one in arch bridge, and it has the general features of arch bridge, the advantage simultaneously having again self.Tie-rod
Arch bridge has the advantage of arch and beam, by two kinds of basic structure forms of arch and beam being combined, common bearing load, fully
Play beam by curved, the structural behaviour of arch pressurized and compound action.The horizontal thrust pull bar of the arch abutment of bowstring arch bridge bears, and makes arch
End bearing does not produce horizontal thrust, forms with the vertical bar connection that two ends are hinged between arch and string.But, in practice of construction process
In, when the arch springing of bowstring arch bridge is the bigger concrete of volume, difficulty of construction is relatively large.Concrete construction exists
Temperature changing process, existing normal concrete rate of set is too fast, causes heat preferably not discharge, inside concrete
Temperature may be up to 60～90 DEG C, thus causes the concrete surface condensed the problem of a large amount of crackle occur, and then to coagulation soil property
Amount and durability cause permanent damage.
Summary of the invention
It is an object of the invention to provide a kind of concrete and preparation method thereof, the setting time of concrete can be extended, profit
In reducing concrete internal temperature, reduce the situation that Temperature Cracks occurs.
Another object of the present invention is to provide the construction method of a kind of above-mentioned concrete, to control concreting process
In temperature, it is to avoid the problem that Temperature Cracks occurs in concrete.
The present invention is achieved in that
A kind of concrete, is mainly made by following components by weight: cement 1～3 parts；Sand 1～2 parts；Broken
Stone 1.8～3 parts；Water 0.2～0.5 part；Polycarboxylate dehydragent 0.01～0.03 part.Wherein, the modulus of fineness of sand be 2.5～
3.0, the particle size distribution in rubble is that the part by weight of 5～10mm is 30%, 5～the part by weight of 25mm is 70%.
The manufacture method of above-mentioned concrete comprises the following steps: cement, sand, rubble are mixed to form glued material；By poly-carboxylic
Hydrochlorate water reducer water dissolution forms water reducer solution；And gluing material is mixed with water reducer solution stirring, obtain concrete.
The construction method of concrete comprises the following steps: enter prefabricated by concrete continuous placing in the way of thin concrete lift
Template；After having poured, concrete is carried out water smoke maintenance；After final set, overlay masking thing moisturizing of sprinkling water, concrete is poured into
During prefabricated template, temperature is below 28 DEG C.
The beneficial effect of such scheme: the invention provides a kind of concrete and have that intensity is high, cement consumption is few, the slump
Low and the advantage of presetting period length.By the concrete using the present invention to provide, and construction method, it is possible to achieve good
Construction effect, inside concrete maximum temperature is not more than 60 DEG C, and concrete surface is without Temperature Cracks.
Detailed description of the invention
Below in conjunction with embodiment, embodiment of the present invention are described in detail, but those skilled in the art will
Understanding, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the present invention.In embodiment unreceipted specifically
Condition person, the condition advised according to normal condition or manufacturer is carried out.Agents useful for same or instrument unreceipted production firm person, be
Can be by the commercially available conventional products bought and obtain.
It is specifically described below for the concrete of the embodiment of the present invention and making thereof, construction method:
A kind of concrete, it is characterised in that be mainly made by following components by weight:
Cement 1～3 parts；Sand 1～2 parts；Rubble 1.8～3 parts；Water 0.2～0.5 part；Polycarboxylate dehydragent 0.01～
0.03 part.The modulus of fineness of sand is 2.5～3.0, the particle size distribution in rubble be the part by weight of 5～10mm be 30%, 5～
The part by weight of 25mm is 70%.
Preferably, the content of each component is as follows: cement 1.5～2 parts；Sand 1.0～1.4 parts；Rubble 1.9～2 parts；Water 0.3
～0.5 part；Polycarboxylate dehydragent 0.012～0.02 part.It is highly preferred that the content of each component is as follows: cement 1 part；Sand 1.37
Part；Rubble 1.89 parts；0.31 part of water；Polycarboxylate dehydragent 0.012 part.
The substantial amounts of heat of hydration can be produced during mixing with water due to cement, and temperature promotes soon, heat radiation is slow, thus hold
It is easily caused inside concrete and puts aside substantial amounts of hydration heat of cement, make the internal temperature of concrete steeply rise.Inside and outside concrete
When the temperature difference is bigger, under certain constraints, concrete surface can produce sizable tension, thus causes concrete to exist
Crack will be produced during shrinkage and creep.
Therefore, the cement in concrete preferably employs low hydration heat cement, its 3 days heats of hydration below 200KJ/Kg, 7 days
The heat of hydration is at below 250KJ/Kg.Further, the consumption of cement is preferably 500Kg/m3Concrete.
Sand and rubble are as the aggregate in concrete.Rubble is skeleton, and sand, as packing material, is filled in the space of rubble
Between.Use the suitable sand of size and rubble so that concrete is finer and close, condense after intensity the highest.When sand
Modulus of fineness reduces, then the surface area of sand increases, and then causes the workability of concrete to reduce with intensity.In the present invention, sand
Modulus of fineness is 2.5～the part by weight that particle size distribution is 5～10mm in 3.0, and rubble is 30%, 5～the weight of 25mm
Ratio is 70%.Use the sand of above-mentioned modulus of fineness and the rubble of particle size distribution, it is possible to achieve sand and the preferable grating of rubble,
In the total surface area to a certain degree reduced in concrete, thus can reduce and need to be filled in rubble, sand surface and space
The quantity of cement mortar, thus decrease the consumption of water consumption and cement.
Water reducer is a kind of under conditions of maintaining concrete slump constant, can reduce outside the concrete of mixing water amount
Add agent.Water reducer belongs to anion surfactant more, such as, and lignosulfonates, naphthalene sulphonate formaldehyde polymer etc..Diminishing
After agent adds concrete mix, cement granules there is is peptizaiton, its workability can be improved, reduce unit consumption of water, improve
The mobility of concrete mix.After water reducer adds, the workability of mixed concrete can be made to improve, hence it is evident that to reduce inside Behavior of Hardened Cement Paste
Pore volume, cement is the finest and close, and the comprcssive strength of concrete significantly improves.Additionally, water reducer also to the hydration rate of cement,
Setting time all has an impact.
Poly carboxylic acid series water reducer has multiple, such as kayexalate, acrylic acid ether copolymer, Grance company of the U.S.
Adva series, the Viscocrete3010 etc. of SIKA company of Switzerland, the GQ-101 polycarboxylic acids of Shandong high-strength building materials company limited is high
Effect water reducer, the TX-2 environment-friendly type high performance water reducing agent of polyocarboxy acid of Jiangxi Tianxiang Science and Technology Ltd..Polycarboxylate dehydragent is
One has the macromolecule polymer material of " pectination " or " dendroid " structure, and its molecular backbone connects to have multiple has a fixed length
Degree and the side chain of rigidity, and on main chain, also have the sulfonate or other group that cement granules can be made charged.Polycarboxylate diminishing
The main chain of agent adsorbs after cement particle surface, side chain and a chain formation crossings on different level of other particle surface, hinders granule
Close to each other, thus reach dispersion, water-reduction.Due to the space structure feature of polycarboxylate dehydragent, it has space bit
Resistance effect, and do not weaken with time lengthening, therefore, the peptizaiton of polycarboxylate water-reducer is the most lasting.Additionally, water reducer
Also help the time lengthening so that concrete.
The concrete that the present invention provides reduces the use of water by using of polycarboxylate dehydragent, by rational sand and
The grating of rubble, reduces water and the consumption of cement further, so that heat of hydration when cement and water mixing reduces, it is to avoid
The problem being produced high temperature by hydration heat of cement in concrete.It addition, the use of polycarboxylate dehydragent so that concrete
Presetting period extends, thus avoids concrete and cross quick setting so that the heat of hydration in concrete can little by little discharge, and reduces
Concrete inside and outside temperature difference mistake, thus avoid the generation of Temperature Cracks.The intensity of the concrete that the present invention provides can reach fc3≥
42.5MPa, i.e. the cubic compressive strength of the concrete of 3 day age is at more than 42.5MPa；fc28>=50MPa that is 28 day age
The cubic compressive strength of concrete is at more than 50MPa；The slump is 140～180mm；Initial set is not less than 8h, and final set is not more than
12h。
Above-mentioned concrete can be made by the following method.Specifically, comprise the following steps: cement, sand, rubble are mixed
Close and form gluing material；Polycarboxylate dehydragent water dissolution is formed water reducer solution；And by gluing material and water reducer solution
Stirring mixing, obtains concrete.
Preferably, during by cement, sand, rubble mixing, the temperature of cement below 40 DEG C, the temperature of sand and rubble is all 20
Below DEG C, during by polycarboxylate dehydragent water dissolution, the temperature of water is below 20 DEG C.By control cement, rubble, sand and
The temperature of water, advantageously reduces the temperature of the concrete that mix is made.The too high meeting of temperature causes the hydration reaction speed of cement
Rate is too fast, thus sends the substantial amounts of heat of hydration in causing the short time, easily causes the drastically rising of heat accumulation and temperature.
Additionally, the mud containing rate of sand and rubble the most preferably at below 2wt%, moisture content the most preferably at below 2wt%.Due to sand
Understand the water reducer in absorption and coagulation soil and water with mud contained in rubble, thus cause the mobility of concrete to decline, thus
Increase water consumption, cause the heat of hydration to increase.Secondly, mud also can wrap up sand and rubble, hinders cement and sand, the combination of rubble, makes
The cohesive force obtained between various raw materials weakens, and the most also can weaken the hydration reaction of cement, forms strength weak district, thus reduces
The slump of concrete.
In order to improve concrete performance, preferably each raw material and making, use process are controlled.
(1) optimised coagulation soil match ratio, reduces hydration heat of cement
Optimised coagulation soil match ratio, selects the good medium coarse sand of grating, rubble, uses the most excellent retardation water reducing agent,
Reduce cement consumption, reduce water consumption；Select low hydration heat cement.Cement: cement is checked in batches, it is ensured that steady quality.
Coarse-fine aggregate: rubble, sand must be well-graded, and material source is stable, checks after admission in batches, strict its clay content of control,
If not reaching requirement, with water rinse qualified after can use, other index compliant requirement.
(2) reduce concrete and mix and stir material placement temperature
Reduce raw-material temperature, particularly reduce the maximum water of specific heat and the temperature of the most aggregate of consumption.
(2.1) mixing water: mixing water uses the phreatic water that temperature is low.Blending station water pipe and water tank add sunshade and every
Hot facility, it is to avoid mixing water is deposited in water tank for a long time, controls water temperature less than 20 DEG C.
(2.2) aggregate: aggregate yard is set up sunshade or covers, it is to avoid direct sunlight.Before concrete-agitating right
Aggregate spraying cold water is lowered the temperature, and controls aggregate temperature less than 20 DEG C.But strictly to control sand material water content in Shi Yonging.
(2.3) cement: use at cement and march into the arena, to reduce cement temperatures for first 7 days.The strict fineness controlling cement and water
Mud enters the temperature before blender, it is ensured that cement enters machine temperature and is not more than 40 DEG C.
(3) temperature during concrete mixing controls
Sunshade measure taked by concrete mixing plant hopper, belt conveyer, blender, it is to avoid periods of direct sunlight.Concrete is mixed
And time, select the time period one day temperature is relatively low to carry out according to stirring side's amount size.Before Jiao Ban, relevant mixing plant is carried out
Watering cooling, but attached water must not be there is with concrete material contact surface when using.In order to rub when reducing concrete-agitating
Wipe the heat produced, on the premise of meeting code requirement, shorten mixing time as far as possible.
Before carrying out concrete-agitating, in addition to water content ratio of aggregate is measured, to ambient temperature and Binder Materials, bone
The temperature of the materials such as material, water measures, and forms relative recording.According to temperature-measuring results, the out-of-machine temperature of concrete is pushed away
Calculate.When calculating concrete out-of-machine temperature more than 25 DEG C, above-mentioned measure is taked to lower the temperature former material.Especially to strengthen mixing
With with the cooling of water.When being necessary, use ice cube that mixing water is lowered the temperature.But ice cube must not enter feed bin, concrete
In must not contain ice cube.Strengthen the measurement to concrete out-of-machine temperature, it is ensured that concrete out-of-machine temperature is not more than 25 DEG C.
(4) temperature in the transportation of concrete controls
Concrete transportation trucd mixer parcel tarpaulin, shortens haulage time as far as possible, reduces concrete and absorbs outside heat.Tarpaulin
Keep moistening, to strengthen heat radiation.Low rate mixing concrete during transport concrete.Distance concrete conveying pipe is taked
Cover sun-proof measure, and it is lowered the temperature by spraying cold water.Strictly regulate field management, strengthen blending station and concreting scene
Information communication, strengthens construction dispatching.Concrete velocity of approach is strictly controlled with cast in situs progress, reasonable arrangement, to the greatest extent
Amount shortening concrete is reached the spot and is waited the time poured, and reduces the ambient temperature adverse effect to concrete.
The construction method of above-mentioned concrete comprises the following steps: enter pre-by concrete continuous placing in the way of thin concrete lift
The template of system.After having poured, concrete is carried out water smoke maintenance.After final set, overlay masking thing moisturizing of sprinkling water, concrete waters
When injecting prefabricated template, temperature is below 28 DEG C.
By using by the way of thin concrete lift, the transmission of the heat of hydration that casting of concrete in mass makes can be avoided.Thin layer
Thickness is 30～50cm, preferably 30cm.Connect stablizing of the thermograde of structure that casting concrete contributes to pouring, with
Time be beneficial to keep the rate of set between concrete and intensity.Additionally, continuous placing also can avoid the temperature contrast mistake of concrete
Big problem.
It is preferred that when casting concrete, also utilize vibrator to vibrate, it is mixed that vibrator inserts that lower floor vibrated
The degree of depth of solidifying soil layer is 5～10cm, and the displacement of vibrator is less than 1.5 times of the operating radius of vibrator.By vibrating
Make to be fully contacted between concrete, react, thus improve compactness and the setting strength of concrete.
After concrete is poured, for the exposed surface of concrete, use in time and spray water smoke maintenance, cover after final set
Geotextiles, moisturizing of sprinkling water, ductility crack can be effectively prevented and produce.During concrete curing, environment and concrete to external world
Internal and external temperature is monitored measuring, and controls concrete cooling gradient well, it is to avoid crackle occur.
According to construction party amount, select the time one day temperature is relatively low to pour, should not in the middle of one day temperature higher
Time pour.When carrying out concrete cast, strengthen concrete batching system performance test, concrete temperature measured, it is ensured that
Concrete molding temperature is not more than 28 DEG C.Secondly, it is ensured that the seriality of concreting, concrete is shortened from blender to entering mould
Passing time and pour the time.
It is preferred that before cast concrete, prefabricated template is cooled down.Specifically, after template assembly puts in place, mould
Panel area takes sunshade measure, prevents template by direct sunlight.After reinforcing bar binding, cover in time, it is to avoid at sunlight
Under tan by the sun.Before cast concrete, use outside cold water sprinkle steel form to reduce die plate temperature.Use cold water sprinkle reinforcing bar
Frame, the most thoroughly drenches the contact surface of non-template medium.Reinforcing bar, template should not have attached water when pouring.This can not only make
Framework of steel reinforcement keeps relatively low temperature, additionally it is possible to make the loss by absorbing and evaporate the concrete water steam caused drop to
Low.
During Specific construction, the most preferably carry out quality monitoring.For preventing concrete disintegration, add reinforced concrete and water
Every inspection before building, preparation, perform process inspection, system recognized by preparation of construction label conscientiously.Especially in template assembly mistake
Cheng Zhong, strengthens piece leak check.On steel form piece, paste double-layer and double-side adhesive tape.But must not should be noted and adhesive tape is squeezed
Enter inside template.Lengthen tumbling barrel, keep tumbling barrel end opening be not more than 1.0 meters away from concreting face, and with pour progress gradually to
Upper lifting.Concrete falling direction avoids reinforcing bar, it is to avoid concrete and rebar collides.Blanking hopper is arranged, when pouring on tumbling barrel
Control concrete pumping speed, it is to avoid concrete overflows from hopper.Tumbling barrel vertically and horizontally spacing is not more than 2 meters, it is to avoid concrete
Distance flows.The strict actual slump of concrete that controls is in the range of the design slump ± 20mm, to ensure that concrete is with easy
Property is good, it is to avoid concrete isolates in flow process.
For reducing the problem of the cold seam that occurs constructing, strengthen site operation scheduling, it is ensured that the seriality of concrete supply.Strengthen
Inspection before pump truck use, it is ensured that pump truck is in good condition.Prepare 1 pump truck standby, or truck crane batch hopper is standby, in case pump truck
Fault causes concreting with disconnected.Strengthen concrete admixture quality examination, it is ensured that additive retarding effect and admixture quantity,
Guarantee that the concrete retarding time reaches to design requirement.
For avoiding the concrete poured that voids and pits occurs, strictly carry out horizontal slice by thickness 30cm and pour, be layered and shake
Smash.During vibrating, vibrator inserts lower-layer concrete 5～10cm, makes lower upper layer concrete be firmly combined with.Subregion vibrates, and one
Layer one vibrates, and vibrates to insert soon and pulls out slowly, and moving interval during vibrator vibration, less than vibrator operating radius 1.5 times.Vibration
Device keeps the distance of 5～10cm with side form and avoids touching reinforcing bar, and vibrator inserts lower-layer concrete 5～10cm, makes lower upper strata
Concrete is firmly combined with.Vibrating time is no longer sunk with concrete, bubble-free rises around vibrator, concrete surface presents flat
Till smooth, bleeding.Strengthen blending station and pour on-site concrete quality control, strictly controlling concrete slump.To blending station
Sand, rubble quality strictly control, before each casting concrete, sand, rubble water content are measured, according to material
Water content determines concrete construction match ratio, controls the actual slump of concrete.
In order to avoid the problem of faulting of slab ends occurs in prefabricated formwork for placing, for the panel less than 1mm of faulting of slab ends during installation form,
Adjust alignment as far as possible.When cannot align, putty is used to strike off at faulting of slab ends.For the faulting of slab ends template more than 1mm, remove and again pacify
Dress.Inside template, increase false stull, draw outside interior top, make template back arris firmness degree identical.In concreting to temporarily
It is drawn off time at stull, it is to avoid casting process staggers because of panel stress.
Below in conjunction with embodiment, the concrete of the present invention and making thereof, construction method are described in further detail.
Polycarboxylate dehydragent in the present invention is bought from BASF AG, and the trade mark is RHEOPLUS411；Cement code name is
P.O42.5。
Embodiment one
Concrete includes following components: 1 kilogram of cement, 1.37 kilograms of sand, rubble 1.89 kilograms, 0.31 kilogram of water and poly-
Carboxylate water reducer 0.012 kilogram.3 days heats of hydration of cement are 200KJ/Kg, and 7 days heats of hydration are 250KJ/Kg.Water-containing rate
0.5wt%, mud containing rate 1wt%；Rubble moisture content 0.1wt%, mud containing rate 1wt%.The modulus of fineness of sand is 2.5.
Manufacture method is as follows: 40 DEG C of cement, 20 DEG C of sand and 17 DEG C of rubble stirrings are mixed to get glued material.By polycarboxylic acids
Salt water reducer and 20 DEG C of water mixing, obtain water reducer solution.Gluing material is gradually added in water reducer solution and stirs simultaneously
Mix, obtain concrete.The presetting period of concrete is 8 hours, and final setting time is 12 hours；Slump 180mm；Intensity fc3For
42.5MPa、fc28For 50MPa.
Construction process is as follows: enter prefabricated by the mode continuous placing of the concrete of the 28 DEG C thin concrete lift with thickness as 30cm
Template.After having poured, concrete is carried out water smoke maintenance；After final set, cover geotextiles moisturizing of sprinkling water.In concrete
Maximum temperature is less than 60 DEG C, and concrete surface is without Temperature Cracks.
Embodiment 2
Concrete includes following components: 1 kilogram of cement, 2 kilograms of sand, rubble 3 kilograms, 0.5 kilogram of water and polycarboxylate
Water reducer 0.02 kilogram.3 days heats of hydration of cement are 187KJ/Kg, and 7 days heats of hydration are 222KJ/Kg；Water-containing rate 2wt%, contain
Mud rate 0.3wt%；Rubble moisture content 0.08wt%, mud containing rate 2wt%, the modulus of fineness of sand are 2.6.
Manufacture method is as follows: 35 DEG C of cement, 16 DEG C of sand and 20 DEG C of rubble stirrings are mixed to get glued material.By polycarboxylic acids
Salt water reducer and 15 DEG C of water mixing, obtain water reducer solution.Gluing material is gradually added in water reducer solution and stirs simultaneously
Mix, obtain concrete.The presetting period of concrete is 8 hours, and final setting time is 11 hours；Slump 146mm；Intensity fc3For
44MPa、fc28For 51MPa.
Construction process is as follows: is entered by the mode continuous placing of 25 DEG C of concrete thin concrete lift with thickness as 35cm and sprays with water
Drench the prefabricated template of cooling.After having poured, concrete is carried out water smoke maintenance；After final set, cover geotextiles the guarantor that sprinkles water
Wet.Maximum temperature in concrete is less than 60 DEG C, and concrete surface is without Temperature Cracks.
Embodiment 3
Concrete includes following components: 2 kilograms of cement, 1.6 kilograms of sand, rubble 2.2 kilograms, 0.3 kilogram of water and poly-carboxylic
Hydrochlorate water reducer 0.026 kilogram.3 days heats of hydration of cement are 180KJ/Kg, and 7 days heats of hydration are 220KJ/Kg；Water-containing rate
0.08wt%, mud containing rate 0.7wt%；Rubble moisture content 1wt%, mud containing rate 1.2wt%.The modulus of fineness of sand is 3.0.
Manufacture method is as follows: 40 DEG C of cement, 20 DEG C of sand and 15 DEG C of rubble stirrings are mixed to get glued material.By polycarboxylic acids
Salt water reducer and 18 DEG C of water mixing, obtain water reducer solution.Gluing material is gradually added in water reducer solution and stirs simultaneously
Mix, obtain concrete.The presetting period of concrete is 6 hours, and final setting time is 10 hours；Slump 152mm；Intensity fc3For
43MPa、fc28For 56.3MPa.
Construction process is as follows: enter prefabricated by the mode continuous placing of the concrete of the 28 DEG C thin concrete lift with thickness as 30cm
Template.After having poured, concrete is carried out water smoke maintenance；After final set, cover geotextiles moisturizing of sprinkling water.Casting process
In, utilizing vibrator to carry out layering and vibrate, it is 7.5 ± 2.5cm that vibrator inserts the degree of depth of the concrete layer that lower floor has been vibrated,
The displacement of vibrator is 1.5 times of the operating radius of vibrator.Maximum temperature in concrete is less than 60 DEG C, and concrete
Surface is without Temperature Cracks.
Although illustrate and describing the present invention with specific embodiment, but it will be appreciated that without departing substantially from the present invention's
May be made that in the case of spirit and scope many other change and amendment.It is, therefore, intended that in the following claims
Including all such changes and modifications belonged in the scope of the invention.
Claims (10)
1. a concrete, it is characterised in that be mainly made by following components by weight:
Cement 1～3 parts；
Sand 1～2 parts；
Rubble 1.8～3 parts；
Water 0.2～0.5 part；
Polycarboxylate dehydragent 0.01～0.03 part；
The modulus of fineness of described sand is 2.5～3.0；In described rubble, the particle diameter of 30wt% is 5～10mm, and the particle diameter of 70wt% is
5～25mm.
Concrete the most according to claim 1, it is characterised in that mainly by following components making by weight
Become:
Described cement 1.5～2 parts；
Described sand 1.0～1.4 parts；
Described rubble 1.9～2 parts；
Described water 0.3～0.5 part；
Described polycarboxylate dehydragent 0.012～0.02 part.
Concrete the most according to claim 1, it is characterised in that 3 days heats of hydration of described cement below 200KJ/Kg,
Within 7 days, the heat of hydration is at below 250KJ/Kg.
Concrete the most according to claim 1, it is characterised in that described polycarboxylate dehydragent includes polystyrolsulfon acid
One or more in sodium, acrylic acid ether copolymer.
Concrete the most according to claim 1, it is characterised in that the mud containing rate of described sand and described rubble is all at 2wt%
Below, moisture content is all at below 2wt%.
6. the manufacture method of the concrete described in an any one of claim 1-5, it is characterised in that comprise the following steps:
Cement, sand, rubble are mixed to form glued material；
Polycarboxylate dehydragent water dissolution is formed water reducer solution；And described glued material is stirred with described water reducer solution
Mix mixing, obtain described concrete.
The manufacture method of concrete the most according to claim 6, it is characterised in that during by cement, sand, rubble mixing, institute
State the temperature of cement below 40 DEG C, the temperature of described sand and described rubble all below 20 DEG C, polycarboxylate dehydragent is used
During water dissolution, the temperature of described water is below 20 DEG C.
8. the construction method of the concrete described in an any one of claim 1-5, it is characterised in that comprise the following steps:
Described concrete continuous placing in the way of thin concrete lift is entered prefabricated template；After having poured, to described concrete
Carry out water smoke maintenance；After final set, overlay masking thing moisturizing of sprinkling water, temperature when described concrete is poured into described prefabricated template
Below 28 DEG C.
The construction method of concrete the most according to claim 8, it is characterised in that when pouring described concrete, also profit
Vibrating with vibrator, it is 5～10cm that described vibrator inserts the degree of depth of the concrete layer that lower floor has been vibrated, described vibration
The displacement of device is less than 1.5 times of the operating radius of described vibrator.
The construction method of concrete the most according to claim 8, it is characterised in that the presetting period of described concrete is big
In 8 hours, final setting time less than 12 hours, the slump of described concrete is 140～180mm.
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| CN201610427758.2A CN106082818A (en) | 2016-06-15 | 2016-06-15 | Concrete and making, construction method |
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Cited By (7)
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| CN106927760A (en) * | 2017-04-17 | 2017-07-07 | 珠海市振业混凝土有限公司 | A kind of composition and preparation method thereof and the application for extending the concrete initial set time |
| CN107324701A (en) * | 2017-05-23 | 2017-11-07 | 安徽砼宇特构科技有限公司 | Impervious concrete box culvert and preparation method thereof |
| CN108677643A (en) * | 2018-06-22 | 2018-10-19 | 杜宇 | A kind of grinding coagulation soil composite pavement and preparation method thereof for not cracking, being not required to setting expansion or contraction joints |
| CN108839232A (en) * | 2018-06-08 | 2018-11-20 | 郑州市市政工程总公司 | Concrete mixer is anti-to be wrapped up in axle construction and prevents wrapping up in axis method |
| CN111411785A (en) * | 2020-03-31 | 2020-07-14 | 五冶集团上海有限公司 | Concrete construction mold-entering temperature control system and temperature control method under high-temperature condition |
| CN112025955A (en) * | 2020-09-25 | 2020-12-04 | 湖北绿缘新型材料科技有限公司 | Formula and production process of subway segment concrete |
| CN112177001A (en) * | 2020-09-18 | 2021-01-05 | 中国三峡建设管理有限公司 | Method for improving construction efficiency of large-volume concrete pouring by dragging or overturning mold |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106927760A (en) * | 2017-04-17 | 2017-07-07 | 珠海市振业混凝土有限公司 | A kind of composition and preparation method thereof and the application for extending the concrete initial set time |
| CN107324701A (en) * | 2017-05-23 | 2017-11-07 | 安徽砼宇特构科技有限公司 | Impervious concrete box culvert and preparation method thereof |
| CN108839232A (en) * | 2018-06-08 | 2018-11-20 | 郑州市市政工程总公司 | Concrete mixer is anti-to be wrapped up in axle construction and prevents wrapping up in axis method |
| CN108677643A (en) * | 2018-06-22 | 2018-10-19 | 杜宇 | A kind of grinding coagulation soil composite pavement and preparation method thereof for not cracking, being not required to setting expansion or contraction joints |
| CN111411785A (en) * | 2020-03-31 | 2020-07-14 | 五冶集团上海有限公司 | Concrete construction mold-entering temperature control system and temperature control method under high-temperature condition |
| CN112177001A (en) * | 2020-09-18 | 2021-01-05 | 中国三峡建设管理有限公司 | Method for improving construction efficiency of large-volume concrete pouring by dragging or overturning mold |
| CN112025955A (en) * | 2020-09-25 | 2020-12-04 | 湖北绿缘新型材料科技有限公司 | Formula and production process of subway segment concrete |
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