CN107827419A - Early strong retarded concrete of low alkalinity and preparation method thereof - Google Patents
Early strong retarded concrete of low alkalinity and preparation method thereof Download PDFInfo
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- CN107827419A CN107827419A CN201711195740.5A CN201711195740A CN107827419A CN 107827419 A CN107827419 A CN 107827419A CN 201711195740 A CN201711195740 A CN 201711195740A CN 107827419 A CN107827419 A CN 107827419A
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- Prior art keywords
- low
- alkalinity
- concrete
- retarded concrete
- early
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Classifications
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The present invention relates to a kind of early strong retarded concrete of low alkalinity, with kg/m3For unit, including following components：Low-alkalinity sulphoaluminate cement 450 550, polycarboxylate water-reducer 49, aluminum sulfate 67, sand 600 650, stone 1,100 1200, water 170 210.For the early strong retarded concrete of low alkalinity of the present invention in 6h, compression strength is more than 20MPa, can meet the proof strength that is open to traffic, and greatly shortens close traffic time or not close traffic.
Description
Technical field
The present invention relates to bridge, highway field, more particularly to early strong retarded concrete of low alkalinity and preparation method thereof.
Background technology
Since the eighties, China started to build highway, more than 12.3 ten thousand kilometers of high speed has successively been built up so far
Highway, more in these highways is 4 lane highways, and is the main line of communication of developed area, with economy
Fast development, the volume of traffic is growing on highway, and being decreased obviously for service level occur in many highways, expands
Build, dilatation the problem of gradually protrude.Reorganization and expansion construction to original road is the important component of a few years from now on highway construction.
During Widening of Freeway, the splicing of the new and old bridge of bridge structure is a key technical problem of Reconstruction Project.It is more early
The new and old bridge jointing of phase sets expansion joint using in new and old bridge link position, or at splicing position using hinge seam connection.Closely
Phase new and old structure is spliced using rigid connection, and its benefit is exactly that driving is comfortable, good endurance, without often maintenance.
In existing technology, when carrying out wet seam concatenation construction to new and old bridge, it is contemplated that the vibration that is open to traffic of old bridge can cause
Wet seam splices concrete cracking, influences construction quality, it will usually take close traffic or semiclosed traffic measure, but this is tight
Ghost image rings road operation, increasingly heavy to bridge jointing seam high performance concrete research and development under driving vibration environment under the pressure of social pressures
Will, in the case where meeting the indices normality condition of seam, how in a short time, it is rapidly completed new-old concrete joint of bridge
Build, and its compression strength is reached the 20MPa of the requirement that is open to traffic, to significant in actual production.
The content of the invention
Based on this, it is necessary to which, in view of the above-mentioned problems, providing one kind in a short time, compression strength reaches the low of the requirement that is open to traffic
Early strong retarded concrete of basicity and preparation method thereof.
It is an object of the invention to provide a kind of early strong retarded concrete of low alkalinity, with kg/m3For unit, including with the following group
Point：
Low-alkalinity sulphoaluminate cement 450-550, polycarboxylate water-reducer 4-9, aluminum sulfate 6-7, sand 600-650, stone
1100-1200, water 170-210.
In one of the embodiments, the mass ratio of the aluminum sulfate and the low-alkalinity sulphoaluminate cement is not less than
0.011。
In one of the embodiments, the polycarboxylate water-reducer is QL-PC5 type high-performance early strength water-reducing agents.
In one of the embodiments, the pH value of the low-alkalinity sulphoaluminate cement is not higher than 10.5.
In one of the embodiments, the strength grade of the low-alkalinity sulphoaluminate cement is 42.5 grades.
In one of the embodiments, the construction temperature of the early strong retarded concrete of the low alkalinity is 15-40 DEG C.
In one of the embodiments, the relative humidity of the construction of the early strong retarded concrete of the low alkalinity is 50%-
80%.
In one of the embodiments, ratio of mud 0.3-0.4.The ratio of mud refers to that the dosage of concrete reclaimed water and cement are used
The weight ratio of amount.
In one of the embodiments, the sand is natural sand, modulus of fineness 2.8；The particle size range of the stone is
5mm-10mm。
It is a further object to provide the preparation method of the early strong retarded concrete of above-mentioned low alkalinity, including following step
Suddenly：
Each raw material is weighed by above-mentioned component；
Stone, sand and low-alkalinity sulphoaluminate cement are mixed into 2-5min, obtain mixture A；
Polycarboxylate water-reducer and aluminum sulfate is soluble in water, stirring, obtain mixture B；
Mixture B is added in mixture A, stirs, obtains low alkalinity early strong retarded concrete.
The principle of the present invention is as follows：
Low-alkalinity sulphoaluminate cement is made by a certain percentage after grinding with sulphoaluminate cement clinker and anhydrite.
Its mineral composition is mainly anhydrous calcium sulphoaluminate, dicalcium silicate, tetra calcium aluminoferrite and calcium sulfate, and its hydrated product is mainly calcium alum
Stone, dihydrate gypsum and alumina hydrate gel.The addition of anhydrite, the basicity of aluminium sulfate is reduced, it is resistance to concrete can be increased
Long property.Meanwhile under conditions of low alkalinity, the growth rate of entringite is slower, extends the presetting period of sulphate aluminium cement,
It is easy to construct.But the early strength of cement is influenceed by entringite and other hydrated products.Specially：Entringite and other water
Change product connection, form network structure, entringite quantity is more, is grown in cavity more intensive, then the early strength of cement is got over
Greatly.In order to increase the early strength of low-alkalinity sulphoaluminate, the present invention adds aluminum sulfate and polycarboxylic acids in low alkalinity cement
Water reducer.After adding aluminum sulfate, the total pore space of cement slurry is greatly reduced, and structure is more closely knit, early strength enhancing；Add poly-
After carboxylic acid water reducer, polycarboxylate has comb shape branched structure, and the MOLECULE DESIGN free degree is big, and grafting is with early powerful small
After molecular radical, strength of cement can be improved while water-reduction is played by steric hindrance disperse cement particles.
Compared with existing scheme, the invention has the advantages that：
The early strong retarded concrete of above-mentioned low alkalinity, using low-alkalinity sulphoaluminate cement as raw material, add polycarboxylate water-reducer
With the raw material such as aluminum sulfate, suitable proportioning is adjusted, in 6h, its compression strength reaches 20MPa, and satisfaction is open to traffic requirement.Low alkalinity
The presetting period of sulphate aluminium cement is longer, and the presetting period refers to the time for losing plasticity to since cement plus water.When pre-hardening
Between it is longer, be more advantageous to construct.Polycarboxylate water-reducer after grafting small molecule group can improve low-alkalinity sulphoaluminate cement
The intensity of early stage, and improve the mobility of concrete, play a part of slow setting and diminishing.Aluminum sulfate is added, can further improve
Compression strength in low-alkalinity sulphoaluminate cement 6h.
The doping of aluminum sulfate has a great influence to the early strength of concrete of the present invention, if aluminum sulfate doping is too low,
The 6h intensity of low-alkalinity sulphoaluminate cement concrete is unsatisfactory for the requirement that is open to traffic.The present invention can also add steel fibre in concrete
Dimension, further improve concrete crushing strength, toughness and tensile strength.
Embodiment
It is described in further detail below in conjunction with specific embodiment strong retarded concrete early to the low alkalinity of the present invention.
Following examples are commercially available with the raw material that comparative example uses, and source is as follows：
Low-alkalinity sulphoaluminate cement：Guangxi Yunyan Special Cement Building Material Co., Ltd., pH value 10.3, strength grade are
42.5；
Quick hardening sulphoaluminate cement：Transport by sea special cement company, and pH value is not more than 11.0, strength grade 42.5；
Polycarboxylate water-reducer：Jiangmen city strength building materials Science and Technology Ltd., model QL-PC5, chained with comb shape branch
Polycarboxylic acid salt's product of structure, grafting small molecule morning strong basis group；
Efficient retarding and water reducing agent：The naphthalene system efficient retarding and water reducing agent of Jiangmen city strength building materials Science and Technology Ltd. production, type
Number it is QL-2；
Sand：Natural sand, specially river sand, fineness modulus 2.8；
Stone：Rubble, particle size range 5mm-10mm.
Embodiment 1
The present embodiment provides a kind of low alkalinity early strong retarded concrete, including：
Low-alkalinity sulphoaluminate cement 550kg/m3, polycarboxylate water-reducer 8.25kg/m3, aluminum sulfate 6.05kg/m3, sand
650kg/m3, stone 1165kg/m3, water 176kg/m3。
The preparation method of the early strong retarded concrete of above-mentioned low alkalinity, comprises the following steps：
Each raw material is weighed by above-mentioned component；
Stone, sand and low-alkalinity sulphoaluminate cement are mixed into 2min, obtain mixture A；
Polycarboxylate water-reducer and aluminum sulfate is soluble in water, stirring, obtain mixture B；
Mixture B is added in mixture A, stirs, obtains low alkalinity early strong retarded concrete.
Embodiment 2
The present embodiment provides a kind of low alkalinity early strong retarded concrete, including：
Low-alkalinity sulphoaluminate cement 476kg/m3, polycarboxylate water-reducer 8.25kg/m3, aluminum sulfate 6.05kg/m3, sand
650kg/m3, stone 1165kg/m3, water 176kg/m3。
The preparation method of the early strong retarded concrete of above-mentioned low alkalinity is same as Example 1, obtains the early strong slow setting coagulation of low alkalinity
Soil.
Embodiment 3
The present embodiment provides a kind of low alkalinity early strong retarded concrete, including：
Low-alkalinity sulphoaluminate cement 550kg/m3, polycarboxylate water-reducer 4.4kg/m3, aluminum sulfate 6.05kg/m3, sand
650kg/m3, stone 1165kg/m3, water 204kg/m3。
The preparation method of the early strong retarded concrete of above-mentioned low alkalinity is substantially the same manner as Example 1, and difference is, construction temperature
For 18 DEG C, relative humidity 78%, low alkalinity early strong retarded concrete is obtained.
Comparative example 1
This comparative example provides a kind of concrete, including：
Low-alkalinity sulphoaluminate cement 550kg/m3, polycarboxylate water-reducer 4.4kg/m3, aluminum sulfate 2.75kg/m3, sand
650kg/m3, stone 1165kg/m3, water 204kg/m3。
The preparation method of above-mentioned concrete is same as Example 3, obtains concrete.
Comparative example 2
This comparative example provides a kind of concrete, including：
Quick hardening sulphoaluminate cement 550kg/m3, efficient retarding and water reducing agent 10kg/m3, steel fibre 65kg/m3, borax
3.3kg/m3, sand 650kg/m3, stone 1165kg/m3, water 204kg/m3。
The preparation method of above-mentioned concrete is substantially the same manner as Example 1, and difference is, construction temperature is 10 DEG C, obtains coagulation
Soil.
Comparative example 3
This comparative example provides a kind of concrete, including：
Low-alkalinity sulphoaluminate cement 550kg/m3, efficient retarding and water reducing agent 5kg/m3, sand 650kg/m3, stone 1165kg/
m3, water 204kg/m3。
The preparation method of above-mentioned concrete is substantially the same manner as Example 1, and difference is, construction temperature is 21.4 DEG C, relatively
Humidity 57.8%, obtains concrete.
Comparative example 4
This comparative example provides a kind of concrete, including：
Low-alkalinity sulphoaluminate cement 550kg/m3, polycarboxylate water-reducer 5.5kg/m3, sand 650kg/m3, stone 1165kg/
m3, water 204kg/m3。
The preparation method of above-mentioned concrete is substantially the same manner as Example 1, and difference is, construction temperature is 19.1 DEG C, relatively
Humidity is 50.1%, obtains concrete.
Embodiment 1-3 and comparative example 1-3 concrete proportioning are as shown in table 1.
The concrete formulation of table 1
The compression strength of embodiment 1-3 and comparative example 1-3 concrete is determined, method is as follows：
Using 100mm × 100mm × 100mm standard cube test specimen, 6h, 10h, 12h are tested with pressure testing machine,
The compression strength at 1d, 3d, 7d and 28d time point, often assemble composition and division in a proportion concrete and test three test specimens at each time point, three
Intensity level of the arithmetic mean of instantaneous value of test specimen measured value as this group of test specimen, if if any one in maximum or minimum value in three measured values
When the individual and difference of median exceedes the 15% of median, then maximum and minimum value is given up removed in the lump, take median as the group
The compression strength value of test specimen；If the difference of maximum and minimum value and median exceedes the 15% of median, this group of test specimen
Result of the test is invalid.
Test result such as table 2：
The compression strength of the concrete of table 2
Understand, in 1-3 of the embodiment of the present invention, in 6h, compression strength is all higher than the early strong retarded concrete of low alkalinity
20MPa, the proof strength that is open to traffic can be met, greatly shorten close traffic time or not close traffic.
In comparative example 1, the doping of aluminum sulfate is too small, and the compression strength in 6h improves ineffective.
In comparative example 2, the presetting period of quick hardening sulphoaluminate cement is shorter, need to add the borax increase presetting period, still,
Final setting time is longer, and in 12h, surface of test piece is non-condensing.
In comparative example 3, the service behaviour of low-alkalinity sulphoaluminate cement is better than quick hardening sulphoaluminate cement, and presetting period
It is longer, it is easy to construct, still, efficient retardation water reducing agent can not improve the intensity of low-alkalinity sulphoaluminate.
In comparative example 4, polycarboxylate water-reducer can improve the compression strength in low-alkalinity sulphoaluminate cement 1d, but right
The raising effect of preceding 6h compression strength is little.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. early strong retarded concrete of low alkalinity, with kg/m3For unit, it is characterised in that including following components：Low-alkalinity sulphoaluminate cement 450-550, polycarboxylate water-reducer 4-9, aluminum sulfate 6-7, sand 600-650, stone 1100- 1200th, water 170-210.
- 2. the early strong retarded concrete of low alkalinity according to claim 1, it is characterised in that the aluminum sulfate and the low alkali The mass ratio for spending sulphate aluminium cement is not less than 0.011.
- 3. the early strong retarded concrete of low alkalinity according to claim 1, it is characterised in that the polycarboxylate water-reducer is QL-PC5 type high-performance early strength water-reducing agents.
- 4. the early strong retarded concrete of low alkalinity according to claim 1, it is characterised in that the low-alkalinity sulphoaluminate water The pH value of mud is not higher than 10.5.
- 5. the early strong retarded concrete of low alkalinity according to claim any one of 1-4, it is characterised in that the low alkalinity sulphur The strength grade of aluminate cement is 42.5 grades.
- 6. the early strong retarded concrete of low alkalinity according to claim any one of 1-4, it is characterised in that the low alkalinity is early The construction temperature of strong retarded concrete is 15-40 DEG C.
- 7. the early strong retarded concrete of low alkalinity according to claim any one of 1-4, it is characterised in that the low alkalinity is early The relative humidity of the construction of strong retarded concrete is 50%-80%.
- 8. the early strong retarded concrete of low alkalinity according to claim any one of 1-4, it is characterised in that ratio of mud 0.3- 0.4。
- 9. the early strong retarded concrete of low alkalinity according to claim any one of 1-4, it is characterised in that the sand is natural Sand, modulus of fineness 2.8；The particle size range of the stone is 5mm-10mm.
- 10. the preparation method of the early strong retarded concrete of any one of the claim 1-9 low alkalinities, it is characterised in that including with Lower step：Component as described in claim 1 weighs each raw material；Stone, sand and low-alkalinity sulphoaluminate cement are mixed into 2-5min, obtain mixture A；Polycarboxylate water-reducer and aluminum sulfate is soluble in water, stirring, obtain mixture B；Mixture B is added in mixture A, stirs, obtains low alkalinity early strong retarded concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711195740.5A CN107827419A (en) | 2017-11-24 | 2017-11-24 | Early strong retarded concrete of low alkalinity and preparation method thereof |
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| CN201711195740.5A CN107827419A (en) | 2017-11-24 | 2017-11-24 | Early strong retarded concrete of low alkalinity and preparation method thereof |
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