CN109704609A - A kind of method that delayed ettringite occurs in inhibition concrete - Google Patents
A kind of method that delayed ettringite occurs in inhibition concrete Download PDFInfo
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- CN109704609A CN109704609A CN201910133848.4A CN201910133848A CN109704609A CN 109704609 A CN109704609 A CN 109704609A CN 201910133848 A CN201910133848 A CN 201910133848A CN 109704609 A CN109704609 A CN 109704609A
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Abstract
The invention discloses the methods that delayed ettringite in a kind of inhibition concrete occurs.The following steps are included: producing concrete using high resistance to corrosion Portland clinker, dihydrate gypsum and function ingredients substitution ordinary portland cement；Said components are as follows according to parts by weight: 60-90 parts of high resistance to corrosion Portland clinker, 10-20 parts of function ingredients, 2-6 parts of dihydrate gypsum.High resistance to corrosion Portland clinker, dihydrate gypsum and the function ingredients compound system that the present invention designs, it is acted synergistically by various aspects, the generation of delayed ettringite in concrete is inhibited jointly, fundamentally solves the problems, such as the delayed ettringite that existing ordinary portland cement concrete occurs under the high temperature conditions.In addition, component used in the present invention belongs to green material, to ecological environment without any negative effect.
Description
Technical field
The invention belongs to field of material technology, and in particular to a method of inhibit delayed ettringite in concrete to occur.
Background technique
Entringite is a kind of important hydrated product, chemical molecular formula 3CaOAl in portland cement2O3·
3CaSO4·32H2O, also known as calcium trisulphoaluminate hydrate (AFt).The aluminic acid three being mainly derived from Portland clinker
Calcium (C3A it) reacts to be formed with dihydrate gypsum.Reaction equation is as follows: C3A+3CaSO4·2H2O+26H2O→3CaO·Al2O3·
3CaSO4·32H2O。
A large number of studies show that entringite has important influence to portland cement early stage hydration process.But in high temperature
(it is generally acknowledged that being higher than 70 DEG C) entringite can decompose when maintenance, generate single sulfur type hydrated calcium aluminate sulfate (AFm), then work as temperature
When degree is reduced to normal temperature condition, single sulfur type hydrated calcium aluminate sulfate (AFm) can recombine to form entringite, swollen so as to cause volume
It is swollen, concrete cracking is caused, here it is the genesis mechanisms of delayed ettringite.Therefore, how to inhibit silicate under the high temperature conditions
The emphasis for being formed into engineering circles care of delayed ettringite in cement, this is also to affect concrete material (especially in advance
Concrete processed, mass concrete) military service durability critical issue.
For delayed ettringite problem existing for ordinary portland cement concrete, control curing temperature is generallyd use, is added
Enter the method for entringite inhibitor to control the formation of delayed ettringite.According to the mode of control temperature, can make prefabricated mixed
Coagulate autochthonal production claim for eot, be unfavorable for industrialization large-scale production, for mass concrete then need using add condenser pipe,
The measures such as raw material temperature are controlled, construction cost is significantly increased.107162457 A of Publication No. CN, a kind of entitled " limitation
The patent of invention of the method for delayed ettringite formation in concrete " inhibits to prolong in concrete by a kind of additional sustained release barium salt
The generation of slow entringite, achieves good results, but its preparation process is complicated, higher cost, and barium salt has certain poison
Property will cause adverse effect to environment.
In conclusion the control method that delayed ettringite in concrete occurs at present is to be introduced from outside into control
, and at high cost, complex process is controlled, in Concrete and work progress, once do not control will not for a certain link
It can avoid generating delayed ettringite.Therefore, it needs fundamentally to find a kind of technological means that inhibition delayed ettringite occurs, from
And the service life for improving concrete durability, extending concrete.
Summary of the invention
It is an object of that present invention to provide the methods that delayed ettringite in a kind of inhibition concrete occurs, by reducing clinker mine
Tricalcium aluminate content and additional function ingredients inhibit the generation of delayed ettringite in concrete, greatly reduction coagulation jointly in phase
The expansion rate of soil.
In order to achieve the above objectives, as follows using technical solution:
A kind of method that delayed ettringite occurs in inhibition concrete, comprising the following steps:
It is mixed using the substitution ordinary portland cement production of high resistance to corrosion Portland clinker, dihydrate gypsum and function ingredients
Solidifying soil；
Said components are as follows according to parts by weight:
60-90 parts of high resistance to corrosion Portland clinker, 10-20 parts of function ingredients, 2-6 parts of dihydrate gypsum.
According to the above scheme, the main component of the high resistance to corrosion Portland clinker includes C3S、C2S、C3A and C4AF；Its
Middle C3S 30-60wt%, C2S 20-40wt%, C3A 1-5wt%, C4AF 15-30wt%.
According to the above scheme, the function ingredients are the mixture of calcium ferrite, fluorite, steel slag, hydrotalcite；According to parts by weight
Are as follows: 5-10 parts of calcium ferrite, 2-8 parts of fluorite, 5-10 parts of steel slag, 1-5 parts of hydrotalcite.
Tricalcium aluminate is easy to react under the high temperature conditions a large amount of single sulfur type hydrated calcium aluminate sulfate (AFm) of generation with gypsum,
This is the basic reason for causing delayed ettringite to occur, and contains less tricalcium aluminate in high resistance to corrosion Portland clinker,
The generation of this is substantially less single sulfur type hydrated calcium aluminate sulfate (AFm), in addition wherein more tetra calcium aluminoferrite also inhibits list
The generation of sulfur type hydrated calcium aluminate sulfate (AFm).In addition, the calcium ferrite and fluorite in selected function ingredients can be with tricalcium aluminates
Reaction generates a kind of stable hydrated product in hot conditions, avoids the conversion to delayed ettringite；And the impurity in steel slag
Ion can be reacted with the single sulfur type hydrated calcium aluminate sulfate (AFm) generated under high temperature, form stable compound；Finally, hydrotalcite is
A kind of function ingredients with ion exchange, can exchange the sulfate ion in concrete, reach inhibition delay calcium alum
The effect that stone occurs.
Compared with the existing technology, the present invention has the beneficial effect that:
Using cementitious material described in the method for the present invention prepare cement slurry generated under the conditions of 90 DEG C of High Temperature Curings compared with
Few single sulfur type hydrated calcium aluminate sulfate (AFm), thus in the effectively less conversion of delayed ettringite of subsequent maintenance stage.
It is far below using 100 days expansion rates that the method for the present invention prepares concrete less than 0.020% and uses normal silicate
It is more than 0.120% that cement, which prepares 100 days expansion rates of concrete, and delayed ettringite has obtained effective inhibition.
High resistance to corrosion Portland clinker, dihydrate gypsum and the function ingredients compound system that the present invention designs, by multi-party
Face synergistic effect, inhibits the generation of delayed ettringite in concrete jointly, fundamentally solves existing normal silicate water
The delayed ettringite problem that cement concrete occurs under the high temperature conditions.
In addition, component used in the present invention belongs to green material, to ecological environment without any negative effect.
Detailed description of the invention
Embodiment 1 and ordinary portland cement prepare product X RD map at Fig. 1: 90 DEG C.
Specific embodiment
Following embodiment further illustrates technical solution of the present invention, but not as limiting the scope of the invention.
Embodiment 1
A kind of method that delayed ettringite occurs in inhibition concrete, high resistance to corrosion portland cement, dihydrate gypsum and each
Function ingredients weight percent are as follows: 80 parts of high resistance to corrosion Portland clinker, 5 parts of calcium ferrite, 4 parts of fluorite, 5 parts of steel slag, water
2 parts of talcum, 4 parts of dihydrate gypsum.Said components collectively constitute composite gelled material, according to weight ratio: sand 680kg/m3, stone
1240kg/m3, composite gelled material 450kg/m3, water 130kg/m3, 100mm × 100mm × 400mm concrete sample is formed,
Then carry out steam-cured, temperature is 90 DEG C, it the time 6 hours, returns 20 DEG C of room temperature and carries out subsequent maintenances, 28 days, 60 days and 100 days
Concrete sample linear expansion rate is tested afterwards.
The composition of embodiment 1 is repeated using ordinary portland cement and method formation of concrete test specimen compares.
1 gained composite gelled material of embodiment and ordinary portland cement prepare product X RD map referring to attached drawing 1 at 90 DEG C
Shown, the cement slurry of the preparation of cementitious material obtained by the present embodiment generates less single sulfur type under the conditions of 90 DEG C of High Temperature Curings
Hydrated calcium aluminate sulfate (AFm).
Embodiment 2
A kind of method that delayed ettringite occurs in inhibition concrete, high resistance to corrosion portland cement, dihydrate gypsum and each
Function ingredients weight percent are as follows: 82 parts of high resistance to corrosion Portland clinker, 6 parts of calcium ferrite, 2 parts of fluorite, 5 parts of steel slag, water
3 parts of talcum, 2 parts of dihydrate gypsum.Then also according to formation of concrete test specimen described in example 1, expansion rate is tested.
Embodiment 3
A kind of method that delayed ettringite occurs in inhibition concrete, high resistance to corrosion portland cement, dihydrate gypsum and each
Function ingredients weight percent are as follows: 75 parts of high resistance to corrosion Portland clinker, 10 parts of calcium ferrite, 3 parts of fluorite, 8 parts of steel slag, water
1 part of talcum, 3 parts of dihydrate gypsum.Then also according to formation of concrete test specimen described in example 1, expansion rate is tested.
Embodiment 4
A kind of method that delayed ettringite occurs in inhibition concrete, high resistance to corrosion portland cement, dihydrate gypsum and each
Function ingredients weight percent are as follows: 76 parts of high resistance to corrosion Portland clinker, 6 parts of calcium ferrite, 5 parts of fluorite, 8 parts of steel slag, water
2 parts of talcum, 3 parts of dihydrate gypsum.Then also according to formation of concrete test specimen described in example 1, expansion rate is tested.
The comparative test result that above-described embodiment tests concrete expansion rate is as shown in table 1:
Table 1
| Age | Blank-is common | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| 28 days expansion rates/(part) | 0.057 | 0.011 | 0.005 | 0.010 | 0.013 |
| 60 days expansion rates/(part) | 0.091 | 0.014 | 0.008 | 0.011 | 0.016 |
| 100 days expansion rates/(part) | 0.122 | 0.018 | 0.013 | 0.013 | 0.017 |
As can be seen from Table 1,28 days expansion rates of the concrete sample prepared using ordinary portland cement reach 0.057
Part, reach 0.122 part within 100 days, shows that more serious delayed ettringite reaction wherein has occurred, cause volume of concrete
It is largely expanded.But in the concrete of the composite gelled material preparation matched using embodiment 1,2,3 and 4, expand within 28 days
Rate is also all respectively less than 0.020 part to 100 days expansion rates only at 0.100 part or so.This illustrates a kind of suppression disclosed in this invention
The method that delayed ettringite occurs in concrete processed inhibits the generation of delayed ettringite in concrete significantly, to substantially drop
The low expansion rate of concrete, this makes, and using the concrete of this method preparation, volume stability is more preferable after High Temperature Curing,
Cracking risk is lower, has more excellent long durability energy, ensure that preparing concrete material using the present invention can grow
Phase safe handling.
In conclusion a kind of method for inhibiting delayed ettringite generation in concrete of the present invention, greatly inhibits
Delayed ettringite is formed, it is ensured that concrete material has excellent volume stability after High Temperature Curing.In addition to illustrate
, preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although passing through above preferred embodiment
The present invention is described in detail, however, those skilled in the art should understand that, can be right in the form and details
It makes various changes, without departing from claims of the present invention limited range.
Claims (3)
1. a kind of inhibit the method that delayed ettringite occurs in concrete, it is characterised in that the following steps are included:
Coagulation is produced using high resistance to corrosion Portland clinker, dihydrate gypsum and function ingredients substitution ordinary portland cement
Soil；
Said components are as follows according to parts by weight:
60-90 parts of high resistance to corrosion Portland clinker, 10-20 parts of function ingredients, 2-6 parts of dihydrate gypsum.
2. inhibiting the method that delayed ettringite occurs in concrete as described in claim 1, it is characterised in that the high resistance to corrosion silicon
The main component of acid salt cement clinker includes C3S、C2S、C3A and C4AF；Wherein C3S 30-60wt%, C2S 20-40wt%, C3A
1-5wt%, C4AF 15-30wt%.
3. inhibiting the method that delayed ettringite occurs in concrete as described in claim 1, it is characterised in that the function ingredients
For calcium ferrite, fluorite, steel slag, hydrotalcite mixture；It is calculated by weight as: 5-10 parts of calcium ferrite, 2-8 parts of fluorite, steel slag
5-10 parts, 1-5 parts of hydrotalcite.
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| CN201910133848.4A CN109704609B (en) | 2019-02-22 | 2019-02-22 | Method for inhibiting generation of delayed ettringite in concrete |
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| CN201910133848.4A CN109704609B (en) | 2019-02-22 | 2019-02-22 | Method for inhibiting generation of delayed ettringite in concrete |
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| CN109704609B CN109704609B (en) | 2021-05-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163191A (en) * | 2021-12-11 | 2022-03-11 | 深圳市恒星建材有限公司 | Early-strength self-compacting concrete and preparation method thereof |
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| US20020023574A1 (en) * | 2000-06-21 | 2002-02-28 | Marcel Sommer | Sulfate-free and alkali-free setting and hardening accelerator |
| CN1699244A (en) * | 2005-04-30 | 2005-11-23 | 南京师范大学 | Multifunctional chlorine-free alkali-free compound concrete slag admixture and its preparation process |
| CN103043970A (en) * | 2012-12-31 | 2013-04-17 | 中国核工业华兴建设有限公司 | Concrete for nuclear power station |
| CN106082724A (en) * | 2016-06-08 | 2016-11-09 | 武汉理工大学 | The strongest a kind of high, high resistance to corrosion portland cement and preparation method thereof |
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2019
- 2019-02-22 CN CN201910133848.4A patent/CN109704609B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020023574A1 (en) * | 2000-06-21 | 2002-02-28 | Marcel Sommer | Sulfate-free and alkali-free setting and hardening accelerator |
| CN1699244A (en) * | 2005-04-30 | 2005-11-23 | 南京师范大学 | Multifunctional chlorine-free alkali-free compound concrete slag admixture and its preparation process |
| CN103043970A (en) * | 2012-12-31 | 2013-04-17 | 中国核工业华兴建设有限公司 | Concrete for nuclear power station |
| CN106082724A (en) * | 2016-06-08 | 2016-11-09 | 武汉理工大学 | The strongest a kind of high, high resistance to corrosion portland cement and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 向卫平等: "基于欧洲标准研究内部硫酸盐反应对混凝土体积稳定性的影响", 《新型建筑材料》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163191A (en) * | 2021-12-11 | 2022-03-11 | 深圳市恒星建材有限公司 | Early-strength self-compacting concrete and preparation method thereof |
| CN114163191B (en) * | 2021-12-11 | 2022-11-11 | 深圳市恒星建材有限公司 | Early-strength self-compacting concrete and preparation method thereof |
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