CN109279805A - One kind being used for ante-sulphoaluminate cement concrete anticracking type additive - Google Patents
One kind being used for ante-sulphoaluminate cement concrete anticracking type additive Download PDFInfo
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- CN109279805A CN109279805A CN201811219670.7A CN201811219670A CN109279805A CN 109279805 A CN109279805 A CN 109279805A CN 201811219670 A CN201811219670 A CN 201811219670A CN 109279805 A CN109279805 A CN 109279805A
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- sulphoaluminate cement
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention provides one kind to be used for ante-sulphoaluminate cement concrete anticracking type additive.By weight percentage, the ante-sulphoaluminate cement concrete anticracking type additive that is used for mainly includes following components: levigate quartz sand 20% ~ 30%；Polycarboxylic acids water reducing type mother liquor 20% ~ 30%；Sodium tetraborate 10% ~ 20%；Redispersable latex powder 4 ~ 10%；Polyvinyl alcohol 2 ~ 8%；Aluminium hydroxide 3 ~ 7%；Mannitol 5 ~ 10%；Calcium formate 2 ~ 7%.Additive outstanding advantages produced by the present invention are: initial slump is high, and 4h slump free of losses is able to maintain under 35 DEG C of execution conditions；Ante-sulphoaluminate cement concrete early stage and later strength are played without influence；It is good with cement adaptability；Cracking resistance is excellent, and heat release will not be concentrated because of ante-sulphoaluminate cement concrete and generates concrete cracking.The present disclosure applies equally to sulphoaluminate cement base materials.
Description
Technical field
The present invention relates to technical field of an additive for construction more particularly to a kind of ante-sulphoaluminate cement concrete
Crack resistance type additive.
Background technique
Ante-sulphoaluminate cement is a kind of sulphate aluminium cement containing tricalcium silicate, compared to common aluminium sulfate
Cement, its setting time is shorter (10min can reach initial set), and early strength is higher (1d intensity can achieve 50MPa), and
Later strength constantly increases, and anti-corrosion anti-permeability performance is more preferable, can be used as reliable repairing/protection cement.
Entitled " a kind of sulphate aluminium cement concrete pump-feed agent (Chinese patent application publication No.: CN103588416A) "
Patent disclose a kind of pumping admixture for sulphate aluminium cement concrete.The invention only discusses the retarding effect of pumping admixture
Influence with pumping admixture to concrete strength is not directed to crack-resistant performance of concrete problem.
Entitled " a kind of special slow condensing type super early strength pumping aid for quick-hardening sulphate aluminum cement (Chinese patent application publication No.:
CN103539384A patent) " discloses a kind of pumping admixture for quick hardening sulphoaluminate cement concrete.The invention mainly solves
Certainly the technical issues of is the slow setting and super hardening for realizing quick hardening sulphoaluminate cement, is not directed to crack-resistant performance of concrete problem,
And the concrete condition for preparing sulphate aluminium cement concrete to the pumping admixture does not describe.
The performance of ante-sulphoaluminate cement is better than common sulphate aluminium cement, but at present on the market for common
The additive of sulphate aluminium cement concrete only focuses on slow setting and super hardening problem, not in view of when retarder consumption in concrete
After complete, cement can sharply heat release, concrete internal temperature sharply increases, and causes temperature difference crack, this can make the durability of concrete
Degradation.
Therefore, a kind of crack resistance type additive for ante-sulphoaluminate cement concrete is needed to solve above-mentioned ask
Topic.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of cracking resistances for ante-sulphoaluminate cement concrete
Type additive.
It can be reached provided by the present invention for the crack resistance type additive initial slump of ante-sulphoaluminate cement concrete
To 260mm, 4h slump free of losses is able to maintain under 35 DEG C of execution conditions；To ante-sulphoaluminate cement concrete early stage
It plays with later strength without influence；It is good with cement adaptability；Cracking resistance is excellent, will not be because of alite-aluminium sulfate water
Cement concrete concentrates heat release and generates concrete cracking.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of crack resistance type additives for ante-sulphoaluminate cement concrete, including following weight
The component of percentage:
Levigate quartz sand 20% ~ 30%
Polycarboxylic acids water reducing type mother liquor 20% ~ 30%
Sodium tetraborate 10% ~ 20%
Redispersable latex powder 4 ~ 10%
Polyvinyl alcohol 2 ~ 8%
Aluminium hydroxide 3 ~ 7%
Mannitol 5 ~ 10%
Calcium formate 2 ~ 7%
The sum of above-mentioned each component is 100%.
Preferably, the crack resistance type additive for ante-sulphoaluminate cement concrete, including following parts by weight
Several components:
Levigate quartz sand 23% ~ 28%
Polycarboxylic acids water reducing type mother liquor 23% ~ 28%
Sodium tetraborate 15% ~ 18%
Redispersable latex powder 6 ~ 10%
Polyvinyl alcohol 2 ~ 5%
Aluminium hydroxide 4 ~ 6%
Mannitol 8 ~ 10%
Calcium formate 3 ~ 7%
The sum of above-mentioned each component is 100%.
Preferably, the levigate quartz sand average grain diameter is less than 3um.
Preferably, the polycarboxylic acids water reducing type mother liquor is acrylic compounds, methacrylic, maleic acid anhydride, maleic acid
One of class polycarboxylate water-reducer.
Preferably, the polycarboxylic acids water reducing type mother liquor solid content is 40%.
Preferably, the redispersable latex powder is ethylene-vinyl acetate copolymer, vinylacetate-versatic acid second
One of enoate copolymer or acrylic styrene copolymer.
Preferably, the preparation method for ante-sulphoaluminate cement concrete anticracking type additive, including
Following steps:
Step 1: weighing or preparing each component according to the proportion；
Step 2: levigate quartz sand, polycarboxylic acids water reducing type mother liquor and mannitol are sufficiently mixed, put in a drying box, be dried to and contain
Water rate is lower than 1%；
Step 3: successively redispersable latex powder, sodium tetraborate, polyvinyl alcohol, aluminium hydroxide, calcium formate and step 2 are made
Powder be put into mixing three minutes in batch mixer, obtain for ante-sulphoaluminate cement concrete anticracking type additive.
Preferably, the ante-sulphoaluminate cement concrete anticracking type additive that is used for is equally applicable to sulphur aluminium
Acid salt cement sill.
The work of several main raw material(s)s is now used as following elaboration by technical solution of the present invention for ease of understanding:
1. the present invention is using quartz sand as the dispersible carrier of polycarboxylate water-reducer and mannitol.Quartz sand be a kind of quality it is hard,
The silicates mineral wear-resisting, chemical property is stable, main component are inertia silica, will not be with inside concrete substance
It reacts, reliable performance.It is dried by mixing levigate quartz sand, polycarboxylate superplasticizer mother liquor and mannitol, can allow liquid
Effective component in the polycarboxylate superplasticizer mother liquor and mannitol of body is adsorbed on levigate quartz sand, is conducive to the hair of their effects
The effect of waving.And levigate quartz sand particle size is small, can widen the size distribution of cement, enter concrete structure as superfine powder and work as
In, keep concrete structure more closely knit；
2. the present invention is using sodium tetraborate and polyvinyl alcohol as ante-sulphoaluminate cement concrete anticracking type additive slow setting
Component.The Ca in boric acid molecules of salt and solution in sodium tetraborate2+Complex compound is formed, to inhibit Ca2+Crystallization is precipitated.Network
Object is closed mainly with C3A·3Ca(BO2)2·H2The form of O forms one layer of unbodied barrier layer in cement particle surface, to prolong
The aquation and crystallization for having delayed cement are precipitated.And there is hydrophilic group and hydrophobic group Liang Zhong functional group simultaneously in polyvinyl alcohol structures, it can
So that intermolecular active force is maintained in the aquation layer surface of thickness, cement suspended substance is set also to have peptizaiton, they not only exist
The particle surface of former gum material adsorbs, and on the embryos that can be adsorbed on cenotype during aquation, hardening, and keeps it steady
It is fixed.In actual use, pass through sodium tetraborate and polyvinyl alcohol compatibility, it is ensured that ante-sulphoaluminate cement concrete exists
Under the conditions of 35 DEG C, 4h slump free of losses；
3. the present invention is using redispersable latex powder as the cracking resistance group of ante-sulphoaluminate cement concrete anticracking type additive
Point.Redispersable latex powder forms a film after dispersing in cement and plays humidification, protecting colloid quilt as second of adhesive
Concrete system absorbs (will not be fallen by water destruct after film forming, or " twice dispersing "), and the fluoropolymer resin to form a film is as enhancing
Material distribution, to increase the cohesive force of concrete, prevents concrete cracking with entire concrete system.But it can be again
Solvability is limited in a liquid for dispersed latex powder, so those skilled in the art is generally added not as cracking resistance component
In additive, and what the present invention innovated prepares additive using solid dielectric, this is with regard to very good solution redispersable latex powder
High additive problem；
4. the present invention is using calcium formate and aluminium hydroxide as the super hardening component of ante-sulphoaluminate cement concrete.Formic acid
Ca in liquid phase can be improved in calcium2+Al in liquid phase can be improved in concentration, aluminium hydroxide3+Concentration, common-ion effect can accelerate crystallization speed
Rate increases the solid phase ratio in concrete, advantageously forms water mudrock structure；
5. the present invention is using mannitol as the anti-educing component of ante-sulphoaluminate cement concrete.
Compared with prior art, the invention has the benefit that
1. additive initial slump produced by the present invention can reach 260mm, the 4h slump is able to maintain under 35 DEG C of execution conditions
Free of losses is especially suitable for the construction of high temperature area；
2. playing ante-sulphoaluminate cement concrete early stage and later strength without influence；
3. good with cement adaptability；
4. cracking resistance is excellent, heat release will not be concentrated because of ante-sulphoaluminate cement concrete and generates concrete cracking.
Specific embodiment
The present invention will be further described with reference to embodiments, but the invention is not limited to these embodiments.
Embodiment 1
A kind of crack resistance type additive for ante-sulphoaluminate cement concrete, by weight percentage, including with the following group
Point:
Levigate quartz sand 24%
Polycarboxylic acids water reducing type mother liquor 24%
Sodium tetraborate 18%
Redispersable latex powder 8%
Polyvinyl alcohol 4%
Aluminium hydroxide 6%
Mannitol 9%
Calcium formate 7%
The levigate quartz sand average grain diameter is 2.4um；The polycarboxylic acids water reducing type mother liquor is maleic anhydride class polycarboxylic acids diminishing
Agent；The polycarboxylic acids water reducing type mother liquor solid content is 40%；The redispersable latex powder is ethylene-vinyl acetate copolymer.
A kind of preparation process of the crack resistance type additive for ante-sulphoaluminate cement concrete, as follows
It carries out:
Step 1: weighing or preparing each component according to the proportion；
Step 2: levigate quartz sand, polycarboxylic acids water reducing type mother liquor and mannitol are sufficiently mixed, put in a drying box, be dried to and contain
Water rate is lower than 1%；
Step 3: successively redispersable latex powder, sodium tetraborate, polyvinyl alcohol, aluminium hydroxide, calcium formate and step 2 are made
Powder be put into mixing three minutes in batch mixer, obtain for ante-sulphoaluminate cement concrete anticracking type additive.
Embodiment 2
A kind of crack resistance type additive for ante-sulphoaluminate cement concrete, by weight percentage, including with the following group
Point:
Levigate quartz sand 26%
Polycarboxylic acids water reducing type mother liquor 22%
Sodium tetraborate 18%
Redispersable latex powder 10%
Polyvinyl alcohol 5%
Aluminium hydroxide 5%
Mannitol 8%
Calcium formate 6%
The levigate quartz sand average grain diameter is 2.4um；The polycarboxylic acids water reducing type mother liquor is acrylic compounds polycarboxylate water-reducer；
The polycarboxylic acids water reducing type mother liquor solid content is 40%；The redispersable latex powder is acrylic styrene copolymer.
A kind of preparation process of the crack resistance type additive for ante-sulphoaluminate cement concrete, as follows
It carries out:
Step 1: weighing or preparing each component according to the proportion；
Step 2: levigate quartz sand, polycarboxylic acids water reducing type mother liquor and mannitol are sufficiently mixed, put in a drying box, be dried to and contain
Water rate is lower than 1%；
Step 3: successively redispersable latex powder, sodium tetraborate, polyvinyl alcohol, aluminium hydroxide, calcium formate and step 2 are made
Powder be put into mixing three minutes in batch mixer, obtain for ante-sulphoaluminate cement concrete anticracking type additive.
Embodiment 3
A kind of crack resistance type additive for ante-sulphoaluminate cement concrete, by weight percentage, including with the following group
Point:
Levigate quartz sand 26%
Polycarboxylic acids water reducing type mother liquor 26%
Sodium tetraborate 16%
Redispersable latex powder 9%
Polyvinyl alcohol 4%
Aluminium hydroxide 6%
Mannitol 8%
Calcium formate 5%
The levigate quartz sand average grain diameter is 2.4um；The polycarboxylic acids water reducing type mother liquor is that methacrylic polycarboxylic acids subtracts
Aqua；The polycarboxylic acids water reducing type mother liquor solid content is 40%；The redispersable latex powder is Acrylate-styrene bipolymer copolymerization
Object.
A kind of preparation process of the crack resistance type additive for ante-sulphoaluminate cement concrete, as follows
It carries out:
Step 1: weighing or preparing each component according to the proportion；
Step 2: levigate quartz sand, polycarboxylic acids water reducing type mother liquor and mannitol are sufficiently mixed, put in a drying box, be dried to and contain
Water rate is lower than 1%；
Step 3: successively redispersable latex powder, sodium tetraborate, polyvinyl alcohol, aluminium hydroxide, calcium formate and step 2 are made
Powder be put into mixing three minutes in batch mixer, obtain for ante-sulphoaluminate cement concrete anticracking type additive.
Comparative example 1
The production of Shenyang company is used for the pumping admixture of sulphate aluminium cement concrete.
Application implementation case
Additive prepared by the embodiment of the present invention 1 ~ 3 carries out application performance comparative test.The concrete that comparative test uses is each
Material utilization amount is shown in Table 1, and admixture dosage is the 5.2% of cementitious material.Concrete crushing strength is tested according to " normal concrete power
Learn method for testing performance standard " GB/T 50081-2002 progress.
We evaluate the cracking resistance of concrete using adiabatic temperature rise and elasticity modulus.In general: the elasticity of concrete
Modulus is higher, more unfavorable to the anti-crack ability of concrete；The aquation temperature rise of concrete is higher, and the cracking resistance of concrete is poorer.
Each material utilization amount of 1 concrete of table/(kg/m3)。
| Cement | River sand | Rubble | Water |
| 400 | 835 | 975 | 160 |
A kind of crack resistance type additive implementation result for ante-sulphoaluminate cement concrete of table 2.
| Number | 1d compression strength | Initial slump (mm) | The 4h slump (mm) |
| Embodiment 1 | 54.2MPa | 263 | 261 |
| Embodiment 2 | 51.6MPa | 272 | 272 |
| Embodiment 3 | 50.4MPa | 264 | 263 |
| Comparative example 1 | 44.3MPa | 220 | 186 |
A kind of crack resistance type additive cracking resistance test effect for ante-sulphoaluminate cement concrete of table 3.
| Number | Adiabatic temperature rise/(DEG C) | Elasticity modulus/(GPa) |
| Embodiment 1 | 32.3 | 36.4 |
| Embodiment 2 | 34.1 | 33.5 |
| Embodiment 3 | 30.8 | 35.7 |
| Comparative example 1 | 47.6 | 54.2 |
The above is only a preferred embodiment of the present invention, it is noted that come for those of ordinary skill in the art
It says, without departing from the concept of the premise of the invention, several modifications and variations can also be made, these belong to of the invention
Protection scope.
Claims (7)
1. one kind is used for ante-sulphoaluminate cement concrete anticracking type additive, it is characterised in that: contained raw material and weight
Percentage are as follows:
Levigate quartz sand 20% ~ 30%
Polycarboxylic acids water reducing type mother liquor 20% ~ 30%
Sodium tetraborate 10% ~ 20%
Redispersable latex powder 4 ~ 10%
Polyvinyl alcohol 2 ~ 8%
Aluminium hydroxide 3 ~ 7%
Mannitol 5 ~ 10%
Calcium formate 2 ~ 7%
The sum of above-mentioned each component is 100%.
2. according to claim 1 be used for ante-sulphoaluminate cement concrete anticracking type additive, feature exists
In: the levigate quartz sand average grain diameter is less than 3um.
3. according to claim 1 be used for ante-sulphoaluminate cement concrete anticracking type additive, feature exists
In: the polycarboxylic acids water reducing type mother liquor is acrylic compounds, methacrylic, maleic acid anhydride, maleic acid class polycarboxylic acids diminishing
One of agent.
4. according to claim 1 or 3 be used for ante-sulphoaluminate cement concrete anticracking type additive, feature
Be: the polycarboxylic acids water reducing type mother liquor solid content is 40%.
5. according to claim 1 be used for ante-sulphoaluminate cement concrete anticracking type additive, feature exists
In: the redispersable latex powder be ethylene-vinyl acetate copolymer, vinylacetate-vinyl versatate copolymer or
One of acrylic styrene copolymer.
6. the described in any item preparations for ante-sulphoaluminate cement concrete anticracking type additive of claim 1 ~ 5
Method, comprising the following steps:
Step 1: weighing or preparing each component according to the proportion；
Step 2: levigate quartz sand, polycarboxylic acids water reducing type mother liquor and mannitol are sufficiently mixed, put in a drying box, be dried to and contain
Water rate is lower than 1%；
Step 3: successively redispersable latex powder, sodium tetraborate, polyvinyl alcohol, aluminium hydroxide, calcium formate and step 2 are made
Powder be put into mixing three minutes in batch mixer, obtain for ante-sulphoaluminate cement concrete anticracking type additive.
7. described in any item for ante-sulphoaluminate cement concrete anticracking type additive according to claim 1 ~ 6
Using, it is characterised in that: described is equally applicable to sulphur aluminium for ante-sulphoaluminate cement concrete anticracking type additive
Acid salt cement sill.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811219670.7A CN109279805A (en) | 2018-10-19 | 2018-10-19 | One kind being used for ante-sulphoaluminate cement concrete anticracking type additive |
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| CN201811219670.7A CN109279805A (en) | 2018-10-19 | 2018-10-19 | One kind being used for ante-sulphoaluminate cement concrete anticracking type additive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354047A (en) * | 2021-06-17 | 2021-09-07 | 深圳市三绿科技有限公司 | Sandstone flocculating agent inhibition and regulation agent and preparation method thereof |
| CN113429148A (en) * | 2021-06-30 | 2021-09-24 | 武汉工程大学 | Concrete crack-resistant and anti-permeability additive and preparation method thereof |
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| CN1128244A (en) * | 1995-01-04 | 1996-08-07 | 首钢总公司 | Special-purpose retarder for sulpho-aluminate cement |
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| CN103539384A (en) * | 2013-09-24 | 2014-01-29 | 沈阳建筑大学 | Special slow condensing type super early strength pumping aid for quick-hardening sulphate aluminum cement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354047A (en) * | 2021-06-17 | 2021-09-07 | 深圳市三绿科技有限公司 | Sandstone flocculating agent inhibition and regulation agent and preparation method thereof |
| CN113429148A (en) * | 2021-06-30 | 2021-09-24 | 武汉工程大学 | Concrete crack-resistant and anti-permeability additive and preparation method thereof |
| CN113429148B (en) * | 2021-06-30 | 2022-03-15 | 武汉工程大学 | Concrete crack-resistant and anti-permeability additive and preparation method thereof |
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