CN104446267A - Shrinkage-compensating concrete for overlong concrete structure construction - Google Patents
Shrinkage-compensating concrete for overlong concrete structure construction Download PDFInfo
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- CN104446267A CN104446267A CN201410598086.2A CN201410598086A CN104446267A CN 104446267 A CN104446267 A CN 104446267A CN 201410598086 A CN201410598086 A CN 201410598086A CN 104446267 A CN104446267 A CN 104446267A
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Abstract
The invention relates to shrinkage-compensating concrete for overlong concrete structure construction. The shrinkage-compensating concrete for overlong concrete structure construction comprises the following components in parts by weight: 530-590 parts of C40 cement, 1300-1780 parts of medium sand, 1900-2200 parts of pebble, 150 parts of coal ash, 10 parts of water reducing agent, 350 parts of water, and 65-80 parts of expanding agent, wherein the expanding agent comprises the following components in parts by weight: 44-67 parts of sulphoaluminate clinker, 15-25 parts of anhydrite, 5-8 parts of magnesium oxide, 5-10 parts of calcium oxide, 1-2.5 parts of tartaric acid, 1.5-2.5 parts of dispersing agent, 3.5-5.5 parts of sodium silicate and 2.5-7.5 parts of sodium carbonate. The shrinkage-compensating concrete for overlong concrete structure construction disclosed by the invention is scientific in compatibility, simple to produce, wide in material source, and capable of rapidly matching with the strength development requirements of an overlong concrete structure and providing a reasonable shrinkage-compensating capacity.
Description
Technical field
The invention belongs to concrete field, especially a kind of expansive concrete for Overlong Concrete Structure construction.
Background technology
Overlong Concrete Structure constantly occurs in recent years.In these Overlong Concrete Structure arrangement and method for construction, usual employing arranges post-cast strip and ftractures to prevent structure both shrinks, but this arrangement and method for construction can bring certain trouble to structure design and construction.As the cleaning of last-cost joint and dabbing bring certain trouble to joint filling, and extend the duration, template turnover is slow, precipitation and construction management expense increase.Therefore, a kind of expansive concrete technology is arisen at the historic moment.Under the ratio of reinforcement is 0.2%-0.8%, adopt expansive concrete, the proportioning compensation ability of existing expansive concrete is not enough, the swelling agent of major cause is mostly prepare with calcined kaolin, high alumina coal gangue, alunite, anhydrous calcium sulphoaluminate or calcium aluminate clinker and gypsum, and its shortcoming is the problems such as ubiquity rate of expansion is slow, expansion energy is low, waterproof expansion is little, expansion stable period is long.And modern concrete has that early strength is high, fragility large, the feature of stress relaxation ability, therefore there is the contradiction of bulging force that swelling agent provides and concrete strength un-coordinated development, cause compensate for shrinkage scarce capacity.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of expansive concrete for Overlong Concrete Structure construction is provided, this concrete science compatibility, make simple, material source is extensive, can Rapid matching Overlong Concrete Structure strength development requirement, rational compensate for shrinkage ability is provided.
The present invention solves its technical problem and is achieved through the following technical solutions:
For an expansive concrete for Overlong Concrete Structure construction, component and the ratio of weight and number thereof of its swelling agent are respectively:
And component and the optimum ratio of weight and number thereof of described swelling agent are respectively:
And described sulfoaluminate clinker is the aluminum ore of 55 parts by parts by weight, the dihydrate gypsum combined grinding of the Wingdale of 30 parts and 15 parts, is prepared from the temperature lower calcination 1h of 1350-1400 DEG C.
And described anhydrite is the plaster of paris, its fineness is 300 orders.
And described magnesium oxide was burned magnesium oxide, formed through 1300-1400 DEG C of high-temperature calcination by magnesite, its fineness was less than 350 orders.
And described calcium oxide is light-burned calcium oxide, be by calcite after fragmentation, form through 900-1100 DEG C of high-temperature calcination, its fineness is less than 300 orders.
And, described tartrate to be purity be more than 99% pressed powder.
And described dispersion agent is commercially available pull open powder.
And described water glass is technical grade instantly-soluble water glass powder.
And described sodium carbonate is technical grade anhydrous sodium carbonate powder.
Advantage of the present invention and beneficial effect are:
The present invention mainly utilizes calcareous grog, ettringite and magnesia grog three expansion sources to interact, appropriately combined, learns from other's strong points to offset one's weaknesses, and its expansion effect is three's superposition, has good compensating action.What is more important, active recrystallize component is compounded with in the present invention, when super-long structural concrete causes cracking due to drying shrinkage or warm and humid change, moisture enters into inside concrete by microfracture, under alkaline environment effect, tartrate and sodium carbonate and water glass generation priming reaction, form needle-like crystal and fill and seal concrete microfracture, thus realize the permanent water proof anti-seepage function of Overlong Concrete Structure.Compared with prior art, invention introduces retardant, dispersion agent and activated crystalline component, it can not only compensate the contraction that Overlong Concrete Structure produces in hydration and hardening process, contraction long-term after centering also has higher restraining effect, and has self-healing function to the microfracture of Overlong Concrete Structure.Said multifunctional expanded dose of the present invention has following technological merit: easy construction, mixes in concrete and can delay hydrated cementitious, improve its mobility.
Embodiment
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
Embodiment 1
For an expansive concrete for Overlong Concrete Structure construction, its concrete component and weight thereof are respectively: C40 cement 530Kg; Medium sand 1300Kg; Stone 1900Kg; Flyash 150Kg; Water reducer 10Kg; Water 350Kg; Swelling agent 65Kg.Described swelling agent is by sulfoaluminate clinker 67.0Kg; Anhydrite 15.0Kg; Magnesium oxide 5.0Kg; Calcium oxide 5.0Kg; Tartrate 1.0Kg; Dispersion agent 1.5Kg; Water glass 3.5Kg; Sodium carbonate 2.5Kg forms.Sulfoaluminate clinker is the aluminum ore of 55 parts by parts by weight, and the dihydrate gypsum combined grinding of the Wingdale of 30 parts and 15 parts, is prepared from the temperature lower calcination 1h of 1400 DEG C.Anhydrite is the plaster of paris, and its fineness is 300 orders.Magnesium oxide was burned magnesium oxide, and formed through 1400 DEG C of high-temperature calcinations by magnesite, its fineness is less than 350 orders.Calcium oxide is light-burned calcium oxide, is by calcite after fragmentation, and form through 1100 DEG C of high-temperature calcinations, its fineness is less than 300 orders.Tartrate to be purity be more than 99% pressed powder.Dispersion agent is commercially available pull open powder.Water glass is technical grade instantly-soluble water glass powder.Sodium carbonate is technical grade anhydrous sodium carbonate powder.
Embodiment 2
For an expansive concrete for Overlong Concrete Structure construction, its concrete component and weight thereof are respectively: C40 cement 590Kg; Medium sand 1780Kg; Stone 2200Kg; Flyash 150Kg; Water reducer 10Kg; Water 350Kg; Swelling agent 80Kg.Described swelling agent is by sulfoaluminate clinker 44.0Kg; Anhydrite 25.0Kg; Magnesium oxide 8.0Kg; Calcium oxide 10.0Kg; Tartrate 1.5Kg; Dispersion agent 1.0Kg; Water glass 5.5Kg; Sodium carbonate 5.0Kg forms.Sulfoaluminate clinker is the aluminum ore of 55 parts by parts by weight, and the dihydrate gypsum combined grinding of the Wingdale of 30 parts and 15 parts, is prepared from the temperature lower calcination 1h of 1350 DEG C.Anhydrite is the plaster of paris, and its fineness is 300 orders.Magnesium oxide was burned magnesium oxide, and formed through 1300 DEG C of high-temperature calcinations by magnesite, its fineness is less than 350 orders.Calcium oxide is light-burned calcium oxide, is by calcite after fragmentation, and form through 900 DEG C of high-temperature calcinations, its fineness is less than 300 orders.Tartrate to be purity be more than 99% pressed powder.Dispersion agent is commercially available pull open powder.Water glass is technical grade instantly-soluble water glass powder.Sodium carbonate is technical grade anhydrous sodium carbonate powder.
Embodiment 3
For an expansive concrete for Overlong Concrete Structure construction, its concrete component and weight thereof are respectively: C40 cement 560Kg; Medium sand 1580Kg; Stone 2100Kg; Flyash 150Kg; Water reducer 10Kg; Water 350Kg; Swelling agent 70Kg.Described swelling agent is by sulfoaluminate clinker 49.5Kg; Anhydrite 20.0Kg; Magnesium oxide 6.5Kg; Calcium oxide 7.5Kg; Tartrate 2.5Kg; Dispersion agent 2.0Kg; Water glass 4.5Kg; Sodium carbonate 7.5Kg forms.Sulfoaluminate clinker is the aluminum ore of 55 parts by parts by weight, and the dihydrate gypsum combined grinding of the Wingdale of 30 parts and 15 parts, is prepared from the temperature lower calcination 1h of 1400 DEG C.Anhydrite is the plaster of paris, and its fineness is 300 orders.Magnesium oxide was burned magnesium oxide, and formed through 1400 DEG C of high-temperature calcinations by magnesite, its fineness is less than 350 orders.Calcium oxide is light-burned calcium oxide, is by calcite after fragmentation, and form through 900 DEG C of high-temperature calcinations, its fineness is less than 300 orders.Tartrate to be purity be more than 99% pressed powder.Dispersion agent is commercially available pull open powder.Water glass is technical grade instantly-soluble water glass powder.Sodium carbonate is technical grade anhydrous sodium carbonate powder.
Concrete sample of the present invention built after after water curing in 14 days, sample is placed in air and continues its limited expansion rate of test, sample limited expansion rate starts to occur declining and declines very fast, pass through continuance test, when being found to 28 days (672 hours): for C40 concrete, its 28 days limit rate of expansion are close to zero, and meet design requirement (in air the maintenance restriction contract with dry rate≤3.0 × 10-4 of 28 days).
Swelling agent in addition in the present invention claims required to get sulfoaluminate clinker, anhydrite, magnesium oxide, calcium oxide, tartrate, dispersion agent, water glass and sodium carbonate by formula rate, stirs, form product, pack in stirrer.
According to GB23439-2009 standard, the concrete multifunction swelling agent of embodiment 1-3 is carried out to the mensuration of projects index, meet the standard of performance index I type, concrete test result is as shown in table 1:
The standard test of table 1 embodiment 1-3 cement expansive material projects index
Claims (10)
1., for an expansive concrete for Overlong Concrete Structure construction, it is characterized in that: this concrete component and ratio of weight and number thereof are respectively:
2. the expansive concrete for Overlong Concrete Structure construction according to claim 1, is characterized in that: component and the ratio of weight and number thereof of described swelling agent are respectively:
3. the expansive concrete for Overlong Concrete Structure construction according to claim 1, it is characterized in that: described sulfoaluminate clinker is the aluminum ore of 55 parts by parts by weight, the dihydrate gypsum combined grinding of the Wingdale of 30 parts and 15 parts, is prepared from the temperature lower calcination 1h of 1350-1400 DEG C.
4. the expansive concrete for Overlong Concrete Structure construction according to claim 1, it is characterized in that: described anhydrite is the plaster of paris, its fineness is 300 orders.
5. the expansive concrete for Overlong Concrete Structure construction according to claim 1, it is characterized in that: described magnesium oxide was burned magnesium oxide, formed through 1300-1400 DEG C of high-temperature calcination by magnesite, its fineness is less than 350 orders.
6. the expansive concrete for Overlong Concrete Structure construction according to claim 1, it is characterized in that: described calcium oxide is light-burned calcium oxide, be by calcite after fragmentation, form through 900-1100 DEG C of high-temperature calcination, its fineness is less than 300 orders.
7. the expansive concrete for Overlong Concrete Structure construction according to claim 1, is characterized in that: described tartrate to be purity be more than 99% pressed powder.
8. the expansive concrete for Overlong Concrete Structure construction according to claim 1, is characterized in that: described dispersion agent is commercially available pull open powder.
9. the expansive concrete for Overlong Concrete Structure construction according to claim 1, is characterized in that: described water glass is technical grade instantly-soluble water glass powder.
10. the expansive concrete for Overlong Concrete Structure construction according to claim 1, is characterized in that: described sodium carbonate is technical grade anhydrous sodium carbonate powder.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2304210A1 (en) * | 1972-01-28 | 1973-08-16 | Denki Kagaku Kogyo Kk | CEMENT ADDITIVE |
| CN1562857A (en) * | 2004-03-29 | 2005-01-12 | 武汉理工大学 | Method for keeping expansion of steel tube concrete |
| CN1772690A (en) * | 2005-09-22 | 2006-05-17 | 武汉理工大学 | Expansion designable high strength steel pipe concrete and its prepn |
| CN101671154A (en) * | 2009-10-15 | 2010-03-17 | 上海交通大学 | Water-borne permeable crystalline waterproofing material and preparation method thereof |
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2014
- 2014-10-30 CN CN201410598086.2A patent/CN104446267A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2304210A1 (en) * | 1972-01-28 | 1973-08-16 | Denki Kagaku Kogyo Kk | CEMENT ADDITIVE |
| CN1562857A (en) * | 2004-03-29 | 2005-01-12 | 武汉理工大学 | Method for keeping expansion of steel tube concrete |
| CN1772690A (en) * | 2005-09-22 | 2006-05-17 | 武汉理工大学 | Expansion designable high strength steel pipe concrete and its prepn |
| CN101671154A (en) * | 2009-10-15 | 2010-03-17 | 上海交通大学 | Water-borne permeable crystalline waterproofing material and preparation method thereof |
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Application publication date: 20150325 |