CN107459303B - Preparation method of non-autoclaved PHC (prestressed high-strength concrete) tubular pile easy to distribute - Google Patents
Preparation method of non-autoclaved PHC (prestressed high-strength concrete) tubular pile easy to distribute Download PDFInfo
- Publication number
- CN107459303B CN107459303B CN201710603715.XA CN201710603715A CN107459303B CN 107459303 B CN107459303 B CN 107459303B CN 201710603715 A CN201710603715 A CN 201710603715A CN 107459303 B CN107459303 B CN 107459303B
- Authority
- CN
- China
- Prior art keywords
- slow
- release
- concrete
- autoclaved
- tubular pile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention relates to a preparation method of a steam-pressure-free PHC tubular pile easy to distribute, which is characterized by comprising the following steps: the preparation method comprises the steps of preparing the non-autoclaved concrete by adopting a slow-release water reducing agent, finishing the material distribution operation of the tubular pile concrete before the slow-release water reducing agent plays a role of water reduction, enabling the slow-release additive to play a role after the slow-release water reducing agent is subjected to die assembly and tensioning and enters a centrifugal stage, enabling the fluidity of the concrete to be gradually increased in the centrifugal process to be subjected to centrifugal forming, and finally completing the preparation of the non-autoclaved PHC tubular pile through standing, steam curing and demoulding. Has the advantages that: the tubular pile concrete is in a wet granular state in the material distribution process, the problem that the non-autoclaved tubular pile concrete is difficult to distribute due to overhigh viscosity is solved, and the method is particularly suitable for producing thin-wall tubular piles.
Description
Technical Field
The invention relates to the field of building materials, in particular to a preparation method of a non-autoclaved PHC tubular pile easy to distribute.
Background
The PHC pipe pile is an important building foundation form and has production and application in various places in China, and the traditional PHC pipe pile is cured in a normal-pressure steam curing pool and then is cured in a still kettle at high temperature and high pressure to improve the strength of concrete. Aiming at the problems, the PHC tubular pile which is produced by autoclaving and has the defects of high energy consumption, large brittleness, poor impermeability and the like is prepared by adopting a high-performance admixture through a mode of reducing a water-to-rubber ratio, using a high-activity admixture and the like, and the PHC tubular pile which can meet the strength requirement only through normal-pressure steam curing is called as an autoclaved PHC tubular pile and becomes a research hotspot and a development direction of the tubular pile industry at present.
The existing non-autoclaved PHC pipe pile has high requirement on the strength of concrete, so that the water-cement ratio of the concrete is low, the mixing amount of the high-efficiency water reducing agent is high, and the viscosity of the concrete is also high. In order to improve the workability of concrete, if the mixing amount of the water reducing agent is increased, the problems of too high fluidity of concrete, incapability of material distribution, concrete segregation, increase of initial setting time (prolonged standing time), cost increase and the like can be caused, and further normal production is influenced. And reducing the water-reducing agent quantity then can lead to the concrete excessively dry and hard to be sticky, is difficult to mix and cloth receipts face, increases the degree of difficulty of cloth and compound die process, increases workman intensity of labour by a wide margin.
Therefore, although a great deal of research and patents of the non-autoclaved PHC pipe pile exist at present, the non-autoclaved PHC pipe pile is still difficult to popularize and apply, and the main reason is that the non-autoclaved concrete process is difficult to operate, wherein the most difficult process is the process of material distribution and mold assembly.
Disclosure of Invention
Therefore, in order to solve the above disadvantages, the present invention provides a method for preparing a non-autoclaved PHC tubular pile, which is easy to distribute; the problem that the non-autoclaved PHC pipe pile is difficult to distribute due to poor concrete workability is solved; the non-autoclaved PHC pipe pile is prepared by adopting the slow-release water reducing agent, so that the concrete is in a wet powder-dispersed granular state during material distribution, the problem that the non-autoclaved PHC pipe pile is difficult to distribute due to extremely high viscosity is solved, the slow-release additive starts to play a role in water reduction after the die is closed, the fluidity of the concrete is gradually increased in the centrifugal process after the concrete enters a centrifugal stage, the concrete is centrifugally formed, and finally, the preparation of the non-autoclaved PHC pipe pile is completed through static stop, steam curing and demoulding.
The invention is realized in such a way, and constructs a preparation method of the steam-pressure-free PHC tubular pile easy to distribute, which is characterized in that: preparing the non-autoclaved PHC tubular pile concrete by adopting a slow-release water reducing agent, finishing the material distribution operation of the tubular pile concrete before the slow-release water reducing agent plays a role of water reduction, after the slow-release admixture enters a centrifugal stage through die assembly and tensioning, starting the slow-release admixture to play a role of water reduction, enabling the concrete to be centrifugally formed by gradually increasing the fluidity in the centrifugal process, and finally finishing the preparation of the non-autoclaved PHC tubular pile through steam curing, demoulding and natural curing.
The slow-release water reducer comprises but is not limited to a slow-release polycarboxylic acid high-efficiency water reducer and a slow-release naphthalene water reducer.
The slow-release water reducer can be prepared by compounding a slow-release water reducer and a similar non-slow-release water reducer, and the proportion of the slow-release water reducer is 10-100%.
The delayed release time of the slow release water reducer is 10-50 min, and the increase value of the setting time is less than or equal to 90 min.
The concrete mixing ratio of the non-autoclaved pressure pipe pile prepared from the slow-release additive is as follows: the cement material 380-480, the water-cement ratio is 0.21-0.29, the folding and fixing mixing amount of the slow-release water reducing agent is 0.3-1%, and the sand rate is 38-48%, wherein the cement material comprises 60-100% of cement, 0-8% of silica fume, 0-30% of mineral powder and 0-15% of fly ash microbeads.
The initial Victoria consistency grade of the non-autoclaved pipe pile concrete is V0-V3, and the slump grade after 30min loss over time is S1-S3.
The low-speed centrifugation time of the centrifugal molding process is 2-10 min.
The maintenance system is static for 1-3h, the temperature rise time is 1-2h, the constant temperature time is 3-8h, the temperature reduction time is 0.5-1h, and the constant temperature is 80-95 ℃.
The invention has the following advantages: the tubular pile concrete is in a wet granular state in the material distribution process, so that the viscosity of the non-autoclaved tubular pile concrete is improved, the operation difficulty of the material distribution and die assembly process is reduced, the manual material distribution operation is easier, and the method is particularly suitable for producing thin-wall tubular piles.
The tubular pile concrete only needs to be stirred into wet granular state in the production and preparation process, so that the shearing resistance in the stirring process is reduced, the energy consumption of the concrete mixer is reduced, and the efficiency of the mixer is improved.
Detailed Description
The present invention will be described in detail below, and technical solutions in embodiments of the present invention will be clearly and completely described below. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a steam-pressure-free PHC tubular pile preparation method which is easy to distribute through improvement; the method is implemented as follows:
example 1
The non-autoclaved PHC pipe pile concrete is prepared by adopting the slow-release polycarboxylic acid high-efficiency water reducing agent, the delayed release time of the slow-release polycarboxylic acid water reducing agent is 20min, and the increase value of the setting time is less than or equal to 30 min.
The slow-release polycarboxylic acid water reducer and the non-slow-release polycarboxylic acid water reducer are compounded according to the proportion of 50 percent to 50 percent, and the solid content after compounding is 20 percent.
The concrete is prepared according to the following single mixing ratio: 418kg of PO425 cement, 22kg of silica fume, 107kg of water, 6.16kg of compound additive, 800kg of sand and 1200kg of stone. The initial Victoria consistency grade of the non-autoclaved pipe pile concrete is V2, and the slump grade after 30min loss over time is S1.
The low speed centrifugation time of the centrifugal molding process is 5 min.
The curing system is static for 1h, the temperature rising time is 1.5h, the constant temperature time is 4.5h, the temperature reduction time is 1h, and the constant temperature is 90 ℃.
And demolding after the maintenance is finished, and lifting and stacking for natural maintenance.
The demolding strength of the non-autoclaved PHC tubular pile can reach 90MPa, and the 28d strength can reach 95 MPa.
Example 2
The non-autoclaved PHC pipe pile concrete is prepared by adopting the slow-release polycarboxylic acid high-efficiency water reducing agent, the delayed release time of the slow-release polycarboxylic acid water reducing agent is 30min, and the increase value of the setting time is less than or equal to 30 min.
The slow-release polycarboxylic acid water reducer and the non-slow-release polycarboxylic acid water reducer are compounded according to the proportion of 80 percent to 20 percent, and the solid content after compounding is 20 percent.
The concrete is prepared according to the following single mixing ratio: 357kg of PO525 cement, 42kg of mineral powder, 21kg of silica fume, 100kg of water, 6.72kg of compound additive, 800kg of sand and 1200kg of stone. The initial Victoria consistency grade of the non-autoclaved pipe pile concrete is V3, and the slump grade after 30min loss over time is S2.
The low speed centrifugation time of the centrifugal molding process is 3 min.
The curing system is static for 1h, the temperature rise time is 2h, the constant temperature time is 6h, the temperature reduction time is 1h, and the constant temperature is 95 ℃.
And demolding after the maintenance is finished, and lifting and stacking for natural maintenance.
The demolding strength of the non-autoclaved PHC tubular pile can reach 85MPa, and the 28d strength can reach 90 MPa.
Example 3
The autoclaved PHC pipe pile concrete is prepared by adopting the slow-release polycarboxylic acid high-efficiency water reducing agent, the delayed release time of the slow-release polycarboxylic acid water reducing agent is 40min, and the increase value of the setting time is less than or equal to 60 min.
The slow-release polycarboxylic acid water reducer and the non-slow-release polycarboxylic acid water reducer are compounded according to the proportion of 40 percent to 60 percent, and the solid content after compounding is 20 percent.
The concrete is prepared according to the following single mixing ratio: 418kg of PO425 cement, 22kg of silica fume, 107kg of water, 6.16kg of compound additive, 800kg of sand and 1200kg of stone. The initial Victoria consistency grade of the non-autoclaved pipe pile concrete is V3, and the slump grade after 30min loss over time is S1.
The low speed centrifugation time of the centrifugal molding process is 8 min.
The curing system is static for 2 hours, the temperature rising time is 2 hours, the constant temperature time is 5 hours, the temperature reduction time is 1 hour, and the constant temperature is 85 ℃.
And demolding after the maintenance is finished, and lifting and stacking for natural maintenance.
The demolding strength of the non-autoclaved PHC tubular pile can reach 90MPa, and the 28d strength can reach 95 MPa.
Example 4
The non-autoclaved PHC pipe pile concrete is prepared by adopting the slow-release naphthalene-based high-efficiency water reducing agent, the delayed release time of the slow-release naphthalene-based water reducing agent is 30min, and the increase value of the setting time is less than or equal to 30 min.
The slow-release naphthalene water reducer and the non-slow-release naphthalene water reducer are compounded according to the proportion of 70 percent to 30 percent, and the solid content after compounding is 25 percent.
The concrete is prepared according to the following single mixing ratio: 456kg of PO425 cement, 24kg of silica fume, 122kg of water, 8.64kg of compound additive, 800kg of sand and 1200kg of stone. The initial Victoria consistency grade of the non-autoclaved pipe pile concrete is V3, and the slump grade after 30min loss over time is S1.
The low speed centrifugation time of the centrifugal molding process is 5 min.
The curing system is static for 1.5h, the temperature rise time is 2h, the constant temperature time is 8h, the temperature reduction time is 1h, and the constant temperature is 90 ℃.
And demolding after the maintenance is finished, and lifting and stacking for natural maintenance.
The demolding strength of the non-autoclaved PHC tubular pile can reach 85MPa, and the 28d strength can reach 90 MPa.
The description enables one skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. The preparation method of the steam-pressure-free PHC tubular pile easy to distribute is characterized by comprising the following steps of:
firstly, preparing non-autoclaved pressure pipe pile concrete by adopting a slow-release water reducing agent, finishing the material distribution operation of the pipe pile concrete before the slow-release water reducing agent plays a role of water reduction, after the slow-release admixture enters a centrifugal stage through die assembly and tensioning, starting the slow-release admixture to play a role of water reduction, gradually increasing the fluidity of the concrete in the centrifugal process to carry out centrifugal forming, and finally finishing the preparation of the non-autoclaved PHC pipe pile through steam curing, demoulding and natural curing;
the concrete mixing proportion of the non-autoclaved pressure pipe pile prepared from the slow-release water reducer is as follows: gelling material 380-3The water-cement ratio is 0.21-0.29, the folding and fixing mixing amount of the slow-release water reducing agent is 0.3-1%, and the sand rate is 38-48%, wherein the cementing material comprises 60-100% of cement, 0-8% of silica fume, 0-30% of mineral powder and 0-15% of fly ash microbeads;
the low-speed centrifugation time of the centrifugal molding process is 2-10 min;
the steam curing system is static for 1-3h, the temperature rising time is 1-2h, the constant temperature time is 3-6h, the temperature reduction time is 0.5-1h, and the constant temperature is 80-95 ℃;
the slow-release water reducer is prepared by compounding a slow-release water reducer and a similar non-slow-release water reducer, and the proportion of the slow-release water reducer is 10-100%;
the delayed release time of the slow-release water reducer is 10-50 min, and the increase value of the setting time is less than or equal to 90 min;
the initial Victoria consistency grade of the non-autoclaved pipe pile concrete is V0-V3, and the slump grade after 30min loss over time is S1-S3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710603715.XA CN107459303B (en) | 2017-07-23 | 2017-07-23 | Preparation method of non-autoclaved PHC (prestressed high-strength concrete) tubular pile easy to distribute |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710603715.XA CN107459303B (en) | 2017-07-23 | 2017-07-23 | Preparation method of non-autoclaved PHC (prestressed high-strength concrete) tubular pile easy to distribute |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107459303A CN107459303A (en) | 2017-12-12 |
| CN107459303B true CN107459303B (en) | 2020-09-04 |
Family
ID=60546312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710603715.XA Active CN107459303B (en) | 2017-07-23 | 2017-07-23 | Preparation method of non-autoclaved PHC (prestressed high-strength concrete) tubular pile easy to distribute |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107459303B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111217559A (en) * | 2020-02-20 | 2020-06-02 | 建华建材（山西）有限公司 | Non-autoclaved tubular pile and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267180A (en) * | 2011-06-10 | 2011-12-07 | 江苏建华管桩有限公司 | Concrete pile production method free from steaming and pressing and pouring remaining slurry |
| CN104211353A (en) * | 2014-08-29 | 2014-12-17 | 江苏奥莱特新材料有限公司 | Concrete for non-autoclaved PHC tubular pile |
-
2017
- 2017-07-23 CN CN201710603715.XA patent/CN107459303B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267180A (en) * | 2011-06-10 | 2011-12-07 | 江苏建华管桩有限公司 | Concrete pile production method free from steaming and pressing and pouring remaining slurry |
| CN104211353A (en) * | 2014-08-29 | 2014-12-17 | 江苏奥莱特新材料有限公司 | Concrete for non-autoclaved PHC tubular pile |
Non-Patent Citations (1)
| Title |
|---|
| 管桩新生产线专用缓凝型聚羧酸减水剂的合成方法与性能;薛安晶，陈芳斌;《生产技术》;20131228(第6期);第16页右栏最后三行，第17页左栏第1-6行及左栏第2段 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107459303A (en) | 2017-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107814498B (en) | Nano-modified dry-mixed alkali-activated cementing material for rapid repair | |
| CN111574119A (en) | Foam concrete with high light weight and performance and preparation method thereof | |
| CN102603233A (en) | Preparation method of high-durability prestressed centrifugal concrete pile | |
| CN105948649A (en) | 200MPa grade anti-bursting reactive powder concrete under construction site curing conditions and preparation method thereof | |
| CN108358564A (en) | A kind of high ductility cement-base composite material and preparation method thereof | |
| CN109704660B (en) | Non-autoclaved tubular pile in northern area and preparation method thereof | |
| CN104817289A (en) | Slow release retarder for compensating shrinkage concrete, and preparation method and application thereof | |
| CN110258278A (en) | The press mortar and processing method to be come to nothing using microbial strains punishment cement pavement | |
| CN107459303B (en) | Preparation method of non-autoclaved PHC (prestressed high-strength concrete) tubular pile easy to distribute | |
| CN110642577A (en) | Preparation process of corrosion-resistant concrete pipe pile | |
| CN108101406B (en) | Super early strength concrete early strength agent and preparation method thereof | |
| CN112341140B (en) | Assembled building wet joint concrete interface agent and preparation method thereof | |
| CN102875191B (en) | Preparation process for aerated concrete block | |
| CN108911664A (en) | The preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould | |
| CN111606625B (en) | Formula and preparation method of C70 high-strength self-compacting concrete | |
| CN110642570A (en) | Special mortar for pouring miniature pile and preparation method and application thereof | |
| CN100434388C (en) | Raw material formulation for ceramics polymer composite material and preparing method | |
| CN111003988A (en) | C105 non-autoclaved tubular pile for cold area and preparation method thereof | |
| CN112979234A (en) | Concrete mixture for steam-free curing production of PHC (prestressed high-strength concrete) tubular pile and application thereof | |
| CN106630871B (en) | A kind of seat slurry and preparation method thereof for filling prefabricated member gap | |
| CN109384433B (en) | Cementing material for low-heat-damage concrete member | |
| CN104250076A (en) | Emergency first-aid repair special cement for construction engineering | |
| CN112979213A (en) | Production process of concrete additive | |
| JP6591729B2 (en) | Concrete production method | |
| CN110653936A (en) | Novel light wall material with good compression resistance and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |