CN102531478A - Post-tensioned pre-stressing pipeline grouting material - Google Patents
Post-tensioned pre-stressing pipeline grouting material Download PDFInfo
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- CN102531478A CN102531478A CN2011104283665A CN201110428366A CN102531478A CN 102531478 A CN102531478 A CN 102531478A CN 2011104283665 A CN2011104283665 A CN 2011104283665A CN 201110428366 A CN201110428366 A CN 201110428366A CN 102531478 A CN102531478 A CN 102531478A
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- tensioned prestressing
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Abstract
The invention relates to the field of building materials and discloses a post-tensioned pre-stressing pipeline grouting material, which is composed of cement, periclase, a high-efficiency slushing agent, a mineral outer admixture, a plasticizer and a retarder. The weight ratio of the cement, the periclase, the high-efficiency slushing agent, the mineral outer admixture, the plasticizer and the retarder is 90:2.1-5.0:0.3-1.0:4.0-8.0:0.01-0.03:0.02-0.05. The grouting material is easy in raw material purchasing, simple in preparation, environmental-friendly and free of pollution. The water-cement ratio is from 0.26 to 0.28 and greatly reduced. The fluidity is good, and machine outlet fluidity is equal to or smaller than 17s. Setting time is longer, and the grouting material is suitable for pressure grouting conditions on site.
Description
Technical field
The present invention relates to building material field, be specially the grouting material, especially a kind of post-tensioned prestressing pipeline grouting material.
Background technology
Post-stressed precast beam is a common structure pattern in the bridge construction, and this structure has easy construction, practices thrift saving of labor, template and can recycle and be beneficial to batch production and advantage such as produce by batch, can improve engineering construction quality and progress effectively.Along with the improving constantly and develop of modern bridge construction technology, being used widely of large-span prestressed bridge in the Bridges in Our Country construction, the making of single case beam all is the making methods that adopt post stressed concrete in the high ferro construction.
Adopt prestressed strand to pass pre-stressed steel pipe when post-stressed precast beam is made beam slab is pulled to certain camber, the pulling force of prestressed strand plays a part crucial to post-stressed precast beam.And prestressed strand is generally steel product, and its long-term exposure can chemical reaction take place and rotten phenomenon of becoming rusty occur in air, to having a greatly reduced quality the work-ing life of bridge.Materials such as employing cement wrap up prestress pipe grouting with prestressed strand, owing to the shrinkability of cement, the ability that is not easy to be in the milk, be difficult to the requirement of satisfied protection steel bundle.
The material water gray scale that the duct grouting that adopts in the construction at present adopts is bigger, and mobile little, poor durability is to shortcoming such as a little less than the reinforcing bar bond stress; And along with the raising of our construction criteria, its technical feature can not satisfy construction requirements, in the case; My company researches and develops a kind of more high performance injection material voluntarily, under the less situation of wc, keeps bigger degree of mobilization and pressure grouting easily, and its also to have grouting closely knit; Microdilatancy does not have contraction, to performances such as the reinforcing bar bond stress are strong.Construction quality level to improving highway, railway and high ferro has quite high promoter action.
Summary of the invention
The present invention aims to provide a kind of high performance novel grouting material; Be a kind of post-tensioned prestressing pipeline grouting material, can under the less situation of wc, keep bigger degree of mobilization, and have be in the milk closely knit; Microdilatancy does not have contraction, to performances such as the reinforcing bar bond stress are strong.
This post-tensioned prestressing pipeline grouting material, the composition of its ash material comprises cement, periclasite, high efficiency water reducing agent, mineral extra material, softening agent and retardant; Weight ratio is 90: 2.0～5.0: 0.3～1.0: 4.0～8.0: 0.01～0.03: 0.02～0.05.
The composition of ash material also comprises skimmer, and the weight ratio of cement and skimmer is 90: 0.001～0.008.
Cement is high-strength early strength silicate cement, for example PII 52.5R cement.
Content of magnesia 50%～80% in the periclasite, calcium oxide content 10%～20%, dioxide-containing silica≤15%, aluminium sesquioxide content 5%～10%, loss on ignition≤10%.Cement and periclasite weight ratio be preferably 90: 2.0～and 2.5.
The mineral extra material can be selected flyash (I level flyash) for use.
High efficiency water reducing agent is the polycarboxylic acid high efficiency water reducing agent, like SUNBO PC-1030 polycarboxylate high performance water-reducing agent.Softening agent is a hydroxypropyl methyl cellulose ether, and retardant tartrate or boric acid, skimmer are silicone antifoam agent.
Above-mentioned raw materials stirs through the dry-mix mixing machine.
Said post-tensioned prestressing pipeline grouting is expected wc 0.26～0.28, compares with wc 0.30～0.34 to significantly reduce; Mobile better, go out machine degree of mobilization≤17s; Time of coagulation is longer, and the presetting period can surpass 6 hours, in the final setting time 18 hours; Be more suitable for on-the-spot pressure grouting condition.
And this post-tensioned prestressing pipeline grouting material, starting material are purchased easily, and the preparation of grouting material is simple, environmentally friendly pollution-free; Can solve effectively that cable wire exposes in steel pipe and rotten rust has taken place; Can make effectively stress transmission between the full closely knit assurance prestressed strand of slurry and concrete structure in the duct; This injection material does not have contraction and can wrap up prestressed cable fully and it is had stronger bonding force; After the slurry sclerosis higher intensity and Young's modulus are arranged.
Except the construction of post-stressed concrete, this injection material also is widely used in the anchor grouting of earth anchor system, wall head leak-stopping grouting continuously, encloses curtain grouting; Backing plate is sat slurry and column beam joint, engineering first-aid repair and bolt anchoring.
Embodiment
Below in conjunction with embodiment the present invention is done further in detail, intactly explains:
Embodiment 1
90 parts of PII 52.5R cement, periclasite (content of magnesia 50%～80wt%; Calcium oxide content 10%～20wt%; Dioxide-containing silica≤15wt%; Aluminium sesquioxide content 5%～10wt%, 0.007 part of loss on ignition≤10wt%) 2.5 parts, 0.5 part of water reducer (high-efficiency water-reducing agent of poly-carboxylic acid), 7 parts in I level flyash, 0.02 part of softening agent hydroxypropyl methyl cellulose ether, 0.04 part in retardant tartrate and skimmer stir through the dry-mix mixing machine.Add entry, wc 0.26.
Above-mentioned post-tensioned prestressing pipeline grouting material is applied to the system beam of railway list case beam; Can reach under the situation of low water-cement ratio that bigger flowability, pipeline pneumatic mortar is closely knit, not stratified, protection steel hinge line not corrosion for a long time (effect of 0.009% pair of reinforcing bar non-corroding of Cl content), its 28d ultimate compression strength 55Mpa; Folding strength 11Mpa loss of prestress is little; Get a desired effect, like table 1.
The performance of table 1 embodiment 1 post-tensioned prestressing pipeline grouting material
Embodiment 2
90 parts of PII 52.5R cement, periclasite (content of magnesia 50wt%～80wt%; Calcium oxide content 10wt%～20wt%; Dioxide-containing silica≤15wt%; Aluminium sesquioxide content 5wt%～10wt%, loss on ignition≤10wt%) 2.0 parts, SUNBO PC-1030 polycarboxylic acid series high-performance subtract 0.006 part of 0.45 part of agent, 7 parts in I level flyash, 0.01 part of softening agent hydroxypropyl methyl cellulose ether, 0.04 part of retardant boric acid and skimmer, stir through the dry-mix mixing machine.Add entry, wc 0.28.
Above-mentioned post-tensioned prestressing pipeline grouting material is applied to the precoated plate of highway bridge; Go out machine degree of mobilization (initially) 17s, pressing bleeding is 0, to the effect of reinforcing bar non-corroding; Its 28d ultimate compression strength 51Mpa; Folding strength 10Mpa, be used in work-ing life that highway bridge precoated plate resistance to compression effectively prolong bridge with embodiment 1 time of coagulation.
Claims (10)
1. a post-tensioned prestressing pipeline grouting material is characterized in that the composition of ash material comprises cement, periclasite, high efficiency water reducing agent, mineral extra material, softening agent and retardant; Weight ratio is 90: 2.0～5.0: 0.3～1.0: 4.0～8.0: 0.01～0.03: 0.02～0.05.
2. the said post-tensioned prestressing pipeline grouting of claim 1 material is characterized in that content of magnesia 50wt%～80wt% in the said periclasite; Calcium oxide content 10wt%～20wt%; Dioxide-containing silica≤15wt%, aluminium sesquioxide content 5wt%～10wt%, loss on ignition≤10%.
3. the said post-tensioned prestressing pipeline grouting of claim 1 expects that said cement is high-strength early strength silicate cement.
4. the said post-tensioned prestressing pipeline grouting of claim 1 expects that said mineral extra material is a flyash.
5. the said post-tensioned prestressing pipeline grouting of claim 1 expects that said high efficiency water reducing agent is the polycarboxylic acid high efficiency water reducing agent.
6. the said post-tensioned prestressing pipeline grouting of claim 1 expects that said softening agent is a hydroxypropyl methyl cellulose ether.
7. the said post-tensioned prestressing pipeline grouting of claim 1 expects that said retardant is tartrate or boric acid.
8. the said post-tensioned prestressing pipeline grouting of claim 1 material is characterized in that also comprise skimmer, the weight ratio of cement and skimmer is 90: 0.001～0.008.
9. the said post-tensioned prestressing pipeline grouting of claim 1 expects that said skimmer is a silicone antifoam agent.
10. each said post-tensioned prestressing pipeline grouting material of claim 1～9 is characterized in that wc is 0.26～0.28.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011104283665A CN102531478A (en) | 2011-12-20 | 2011-12-20 | Post-tensioned pre-stressing pipeline grouting material |
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| CN2011104283665A CN102531478A (en) | 2011-12-20 | 2011-12-20 | Post-tensioned pre-stressing pipeline grouting material |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041579A (en) * | 2006-03-21 | 2007-09-26 | 上海宝冶工程技术公司 | Four-hour early-strength concrete material |
| CN101157529A (en) * | 2007-08-02 | 2008-04-09 | 铁道科学研究院铁道建筑研究所 | High-performance cement-based shrink-free corrosion-proof grouting agent |
| CN101462861A (en) * | 2008-12-17 | 2009-06-24 | 同济大学 | Grouting material for post-stressed concrete pore passage and preparation thereof |
| CN101602589A (en) * | 2009-06-30 | 2009-12-16 | 中国地质大学（武汉） | Post-tensioned prestressing pipeline vacuum grouting or mud jacking preformed material and preparation method thereof |
| CN101767962A (en) * | 2009-01-06 | 2010-07-07 | 上海罗洋新材料科技有限公司 | Pore canal grouting concrete for buildings |
-
2011
- 2011-12-20 CN CN2011104283665A patent/CN102531478A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041579A (en) * | 2006-03-21 | 2007-09-26 | 上海宝冶工程技术公司 | Four-hour early-strength concrete material |
| CN101157529A (en) * | 2007-08-02 | 2008-04-09 | 铁道科学研究院铁道建筑研究所 | High-performance cement-based shrink-free corrosion-proof grouting agent |
| CN101462861A (en) * | 2008-12-17 | 2009-06-24 | 同济大学 | Grouting material for post-stressed concrete pore passage and preparation thereof |
| CN101767962A (en) * | 2009-01-06 | 2010-07-07 | 上海罗洋新材料科技有限公司 | Pore canal grouting concrete for buildings |
| CN101602589A (en) * | 2009-06-30 | 2009-12-16 | 中国地质大学（武汉） | Post-tensioned prestressing pipeline vacuum grouting or mud jacking preformed material and preparation method thereof |
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Application publication date: 20120704 |