CN102514095A - Preparation method of slurry for prestressed aperture single-stage grouting - Google Patents
Preparation method of slurry for prestressed aperture single-stage grouting Download PDFInfo
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- CN102514095A CN102514095A CN2011104166267A CN201110416626A CN102514095A CN 102514095 A CN102514095 A CN 102514095A CN 2011104166267 A CN2011104166267 A CN 2011104166267A CN 201110416626 A CN201110416626 A CN 201110416626A CN 102514095 A CN102514095 A CN 102514095A
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Abstract
The invention relates to a preparation method of slurry for prestressed aperture single-stage grouting, which belongs to the technical field of building construction. The method comprises the steps of adding water reducing agent into water in a certain proportion and uniformly mixing, adding cement while stirring to form a primary stirred cement slurry, standing to form a primary standing cement slurry, adding retarding and water reducing agent into the primary standing cement slurry to form a secondary stirred cement slurry, standing the secondary stirred cement slurry to obtain a secondary standing cement slurry, adding rheology modifier into the secondary standing cement slurry to ensure that the torque of the slurry reaches more than 500cN.cm, so as to obtain the required slurry for the prestressed aperture single-stage grouting. The cement slurry obtained through the above steps has the properties of good flowability under external force action and gelatinous state in stillness, has good filling effect when being used for grouting long and narrow closed space of prestressed arched apertures, can fill all parts of the arched apertures in one-stage grouting, and guarantees the compaction degree of the apertures.
Description
Technical field
The present invention relates to a kind of preparation method of cement slurry, especially a kind of prestressed pore passage once grouting is used the slurry preparation method, belongs to technical field of building construction.
Background technology
The duct of post-tensioned prestressing systems such as nuclear power plant containment shell adopts the cement slurry pressure injection closely knit usually.For the arch duct, for a long time, form the slurry cavity in order to prevent the higher hogback place of absolute altitude, adopt back-grouting or grouting process repeatedly always.As a result, cause pre-stress construction cycle lengthening; And, after must reserving, the building structure in back-grouting zone waters the district, cause the construction period lengthening; In addition, the arch duct back-grouting mouth of part special area and overfall stay establishes difficulty, and construction space is narrow and small, back-grouting or repeatedly grouting after can not guarantee that the hogback place is closely knit, stay hidden danger of quality easily.
Summary of the invention
The objective of the invention is to: to the problem of above prior art existence; Propose a kind of prestressed pore passage once grouting and use the slurry preparation method; Thereby adopt once grouting can guarantee to comprise that the perfusion in all ducts, arch duct is closely knit, avoid adopting back-grouting or grouting process repeatedly.
In order to reach above purpose, the applicant arrives through analysing in depth study and cognition, and duct grouting requires cement slurry to have good flowability (its relevant performance indications are fluidity---concrete parameter please be provided).And the mobile just bigger slurry of basic reason that causes the hogback place to form the slurry cavity is difficult to due to the gelling.As wanting disposable grouting can guarantee that the perfusion in all ducts is closely knit, just must resolve the contradiction of fluidity of slurry and gelling.
Through experiment repeatedly, the applicant has invented following prestressed pore passage once grouting and has used the slurry preparation method, and this method may further comprise the steps:
The first step, be that implantation temperature is 0 ℃-20 ℃ a water to 100:28-45 (preferably 100:35) in the slurry agitating device by the weight ratio of cement and water;
Second step, be that 100:1.5-3.5 (best 100:2) adds water reducer in the slurry agitating device, mix with water by the weight ratio of cement and water reducer;
The 3rd step, add cement while stirring, continuous stirring makes slurry temperature reach 15 ℃-28 ℃ afterwards, and fluidity reaches 9-14 (best 12) second, forms the slurry that mixes cement for the first time;
The 4th goes on foot, the slurry that mixes cement the first time was left standstill 40-50 minute, obtains leaving standstill for the first time cement slurry;
The 5th step, be that 100:0.2-0.9 (preferably 100:0.5) leaves standstill cement slurry adding retardation water reducing agent while stirring to the first time by the weight ratio of cement and retardation water reducing agent; Continuous stirring makes slurry temperature reach 18 ℃-32 ℃ afterwards; Fluidity reaches 9-14 (best 12) second, forms the slurry that mixes cement for the second time;
The 6th goes on foot, the slurry that mixes cement the second time was left standstill 50-70 minute, obtains leaving standstill for the second time cement slurry;
The 7th step, be that 100:0.3-1.0 (preferably 100:0.7) leaves standstill cement slurry adding rheology modifier while stirring to the second time by the weight ratio of cement and rheology modifier; Continuous stirring afterwards; Make slurry temperature reach 18 ℃-32 ℃; The slurry moment of torsion reaches more than the 500cNcm, obtains required prestressed pore passage once grouting and uses slurry.
Adopt in the slurry of the inventive method acquisition, the molecular organization of cement stirs repeatedly, leaves standstill at warp, and under the effect of various additives; Can form network structure at once when leaving standstill, thereby make slurry have gelling on standing property, and do the time spent when receiving external force such as stirring, pressurised driving; Network structure is destroyed at once; Thereby have good flowability, the cement slurry that therefore obtains through above-mentioned steps has under external force (as stirring, pumping into) good fluidity and is the characteristic of gelatinized, the contradiction of taking this properly to separate mobile and gelling when static; When using it for the long and narrow confined space in perfusion prestressing force arch duct; Have good filling effect, once grouting just can be full of each position in arch duct, guarantees the packing in duct.
The specific embodiment
Below in conjunction with embodiment the present invention is further described.
Embodiment one
The slurry manufacture craft flow process of present embodiment is following: in a pulper, inject 288kg water earlier, add 18kg water reducer (trade mark is CONPLAST SP337, Shanghai Fu Sile chemical building material Co., Ltd) again, stir; Add portland cement 900kg (PII42.5 that the cement plant, Guangzhou produces) then while stirring, stirred 4 minutes, detect slurry temperature and fluidity, temperature fluidity when 15oC got final product at 9 seconds.Afterwards, slurry is put into the secondary pulper, rest and leave standstill 45 minutes, add 4.5kg retardation water reducing agent (trade mark CONPLAST RP264, Shanghai Fu Sile chemical building material Co., Ltd) again, stirred 2-4 minute, temperature fluidity when 18oC is controlled at and got final product in 9 seconds.Afterwards, rest and leave standstill 60 minutes.Afterwards, add 5.85kg rheology modifier (trade mark is CEMETHIX-F, U.S. Resipoly company), stirred 25 seconds, temperature torsion when 18oC gets final product more than being controlled at greater than 500cNcm.When slurry temperature of measuring and torsion reached the scope of above-mentioned technical conditions regulation, slurry was qualified.
Embodiment two
Present embodiment is identical with the step of embodiment one, and difference is: first injection 450kg water in pulper, add 35kg water reducer (the JM-VII type of Su Bote new material Co., Ltd how series high-efficiency water-reducing agent) again, and stir; Add portland cement 1000kg (PII42.5 that Guangzhou tower board group produces) then while stirring, stirred 4 minutes, detect slurry temperature and fluidity, temperature fluidity when 28oC got final product at 14 seconds.Afterwards; Slurry is put into the secondary pulper, rest and leave standstill 50 minutes, add 4.5kg retardation water reducing agent (the JM-VII type of Su Bote new material Co., Ltd how to be retardation water reducing agent) again; Stirred 2-4 minute, temperature fluidity when 30oC is controlled at and got final product in 14 seconds.Afterwards, rest and leave standstill 70 minutes.Afterwards, add 9kg rheology modifier (the LBCB-1 type name of bright rich chemistry is called the rheology modifier of thixotropic agent) fast, stirred 25 seconds, temperature torsion when 32oC gets final product more than being controlled at greater than 500cNcm.When slurry temperature of measuring and torsion reached the scope of above-mentioned technical conditions regulation, slurry was qualified.
The cement mortar of grouting was mobile very big fluid in the past, and its relevant performance indications are fluidity.Above embodiment stirs, leaves standstill for twice through specific feeding sequence, three times, is made into the cement mortar with complete different qualities, and its relevant performance indications are no longer weighed with fluidity, and adopt moment of torsion to weigh.This cement mortar is gelatinized there being external force to have good flowability when (as stirring, pumping into) when static, the long and narrow confined space of similar prestressed pore passage is had good filling effect.Facts have proved that the cement mortar that adopts said method to make just can be full of each position in arch duct when once grouting, guaranteed the close of duct
Repeatedly practise proof, above embodiment can summarize following advantage:
1, made slurry can not produce bleeding;
Can flow, be when static the characteristic of gelatinized when 2, made slurry has the pump slurry, guarantee the packing of duct grouting, possibly form an empty difficult problem greatly because of the slurry fluidity when having solved prestress engineering duct grouting in the past;
3, various arch duct uses made slurry all can adopt once grouting technology, significantly shortens construction period, has eliminated the back-grouting or the hidden danger of quality of grouting process repeatedly effectively;
Except that the foregoing description, the present invention can also have other embodiments.For example the trade mark of cement also can be the PII42.5 cement of Wan'an Enterprise Gen. Corp., Shanghai's production, the PII42.5 cement that cement Co., Ltd in China Resources produces etc.; Water reducer also can adopt how series high-efficiency water-reducing agent etc. of CONPLAST SP420 that Shanghai Fu Sile produces, BASF RH561 type that BASF chemical building material Co., Ltd produces; Retardation water reducing agent can adopt also how the CONPLAST SP420 of Shanghai Fu Sile production, the BASF RH561 type that BASF chemical building material Co., Ltd produces are how 161C, the 165C type that efficient retardation water reducing agent, Gray's Si building material product Co., Ltd produce is efficient retardation water reducing agent etc.All technical schemes that is equal to replacement or equivalent transformation formation all drop on the protection domain of requirement of the present invention.
Claims (6)
1. a prestressed pore passage once grouting is used the slurry preparation method, may further comprise the steps:
The first step, be that 100:28-45 implantation temperature in the slurry agitating device is 0 ℃-20 ℃ a water by the weight ratio of cement and water;
Second step, be that 100:1.5-3.5 adds water reducer in the slurry agitating device, mix with water by the weight ratio of cement and water reducer;
The 3rd step, add cement while stirring, continuous stirring makes slurry temperature reach 15 ℃-28 ℃ afterwards, and fluidity reaches 9-14 second, forms the slurry that mixes cement for the first time;
The 4th goes on foot, the slurry that mixes cement the first time was left standstill 40-50 minute, obtains leaving standstill for the first time cement slurry;
The 5th step, be that 100:0.2-0.9 leaves standstill cement slurry adding retardation water reducing agent while stirring to the first time by the weight ratio of cement and retardation water reducing agent; Continuous stirring makes slurry temperature reach 18 ℃-32 ℃ afterwards; Fluidity reaches 9-14 second, forms the slurry that mixes cement for the second time;
The 6th goes on foot, the slurry that mixes cement the second time was left standstill 50-70 minute, obtains leaving standstill for the second time cement slurry;
The 7th step, be that 100:0.3-1.0 leaves standstill cement slurry adding rheology modifier while stirring to the second time by the weight ratio of cement and rheology modifier; Continuous stirring afterwards; Make slurry temperature reach 18 ℃-32 ℃; The slurry moment of torsion reaches more than the 500cNcm, obtains required prestressed pore passage once grouting and uses slurry.
2. prestressed pore passage once grouting according to claim 1 is used the slurry preparation method, it is characterized in that: the weight ratio of said cement and water is controlled at 100:35.
3. prestressed pore passage once grouting according to claim 1 is used the slurry preparation method, it is characterized in that: the weight ratio of said cement and water reducer is controlled at 100:2.
4. prestressed pore passage once grouting according to claim 1 is used the slurry preparation method, it is characterized in that: the weight ratio of said cement and retardation water reducing agent is controlled at 100:0.5.
5. prestressed pore passage once grouting according to claim 1 is used the slurry preparation method, it is characterized in that: the weight ratio of said cement and rheology modifier is controlled at 100:0.7.
6. use the slurry preparation method according to the arbitrary described prestressed pore passage once grouting of claim 1 to 5, it is characterized in that: said fluidity was controlled at 12 seconds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022116526A1 (en) * | 2020-12-02 | 2022-06-09 | 中广核工程有限公司 | Expansion grout for prestressed pipeline grouting and preparation method therefor |
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| JP2001172062A (en) * | 1999-12-17 | 2001-06-26 | Denki Kagaku Kogyo Kk | Powdery setting regulator, cement concrete, quick- setting cement concrete, and method for working quick- setting cement concrete |
| CN1396048A (en) * | 2002-03-29 | 2003-02-12 | 许虎贤 | Multi-step concrete stirring technology for fast grout preparing method |
| CN1865185A (en) * | 2005-05-21 | 2006-11-22 | 新疆石油管理局钻井工艺研究院 | High density concrete slurry |
| CN101028727A (en) * | 2007-04-10 | 2007-09-05 | 长安大学 | Single-speed cement concrete secondary agitating process |
| CN101434104A (en) * | 2008-11-20 | 2009-05-20 | 中国核工业华兴建设有限公司 | Pulping method for pore passage grouting paste weeping capable of reducing pre-stressing |
| 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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2011
- 2011-12-14 CN CN201110416626.7A patent/CN102514095B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001172062A (en) * | 1999-12-17 | 2001-06-26 | Denki Kagaku Kogyo Kk | Powdery setting regulator, cement concrete, quick- setting cement concrete, and method for working quick- setting cement concrete |
| CN1396048A (en) * | 2002-03-29 | 2003-02-12 | 许虎贤 | Multi-step concrete stirring technology for fast grout preparing method |
| CN1865185A (en) * | 2005-05-21 | 2006-11-22 | 新疆石油管理局钻井工艺研究院 | High density concrete slurry |
| CN101028727A (en) * | 2007-04-10 | 2007-09-05 | 长安大学 | Single-speed cement concrete secondary agitating process |
| CN101434104A (en) * | 2008-11-20 | 2009-05-20 | 中国核工业华兴建设有限公司 | Pulping method for pore passage grouting paste weeping capable of reducing pre-stressing |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022116526A1 (en) * | 2020-12-02 | 2022-06-09 | 中广核工程有限公司 | Expansion grout for prestressed pipeline grouting and preparation method therefor |
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Address after: 210019 Yunlong road 79, Jianye District, Jiangsu, Nanjing Patentee after: CHINA NUCLEAR INDUSTRY HUAXING CONSTRUCTION Co.,Ltd. Patentee after: Jiangsu Zhonghe Huaxing Construction Technology Co.,Ltd. Address before: 210019 Yunlong road 79, Jianye District, Jiangsu, Nanjing Patentee before: CHINA NUCLEAR INDUSTRY HUAXING CONSTRUCTION Co.,Ltd. Patentee before: Jiangsu Zhonghe Huaxing Special Construction Engineering Co.,Ltd. |