CN102701682B - Pump concrete, pump concrete precast pile and production methods of pump concrete and pump concrete precast pile - Google Patents
Pump concrete, pump concrete precast pile and production methods of pump concrete and pump concrete precast pile Download PDFInfo
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- CN102701682B CN102701682B CN201210219895.9A CN201210219895A CN102701682B CN 102701682 B CN102701682 B CN 102701682B CN 201210219895 A CN201210219895 A CN 201210219895A CN 102701682 B CN102701682 B CN 102701682B
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Abstract
The invention provides pump concrete, a pump concrete precast pile and production methods of the pump concrete and the pump concrete precast pile. The raw materials of the pump concrete comprise binding material, fine aggregate, coarse aggregate, water reducer and water, wherein the binding material is a mixture of cement, finely ground sand and coal ash; the total content of the binding material is 300-500kg/m<3>, and the weight sum of the coal ash and the finely ground sand is 5-45wt% of the total weight of the binding material. The peaceability of the pump concrete is improved after the coal ash is mixed into the pump concrete; the friction force of aggregates inside the pump concrete can be effectively reduced, and the friction force between the pump concrete and a pumping pipe is reduced, so as to greatly reduce the resistance of the pump concrete in a pumping process and improve the pumping performance of the pump concrete. The production cost of the pump concrete is obviously reduced because the finely ground sand and the coal ash are lower than the cement in cost.
Description
Technical field
The present invention relates to concrete building material technical field, in particular to a kind of pump concrete, pump concrete premculded pile and production method thereof.
Background technology
Pump concrete premculded pile is as a kind of new premculded pile production technique, have that labour intensity is low, safety coefficient is high, level of automation is high, stay-in-grade clear superiority, the inexorable trend of premculded pile industry and the development of premculded pile manufacturing enterprise will be become, wherein, pumpability of concrete is particularly crucial on the impact of the production efficiency of premculded pile and quality product, in prior art, mainly there is following defect in pumpability of concrete:
(1) to raw material quality, change more responsive;
(2) not good with the adaptability of pumping equipment;
(3) pumping efficiency is stable not.
Due to the above defect of concrete pumping performance, cause the production efficiency of premculded pile not high, quality product is difficult to control, and for above technical problem, not yet proposes at present effective solution.
Summary of the invention
The present invention aims to provide pump concrete, pump concrete premculded pile and the production method thereof that a kind of production cost is relatively low, pump-conveying property is more stable, quality product is more stable, and to solve, the production efficiency of premculded pile in prior art is not high, the unmanageable problem of quality product.
To achieve these goals, according to an aspect of the present invention, a kind of pump concrete is provided, the raw material of this pump concrete comprises: gelling material, fine aggregate, coarse aggregate, water reducer and water, wherein, gelling material is the mixture of cement, levigate sand, flyash, and the total content of gelling material is 300～500kg/m
3, the quality sum of flyash and levigate sand accounts for the 5wt%～45wt% of gelling material gross weight.
Further, the specific surface area of levigate sand and flyash is 350m
2/ kg～500m
2/ kg.
Further, cement is that label is not less than 42.5 silicate cement or ordinary Portland cement.
Further, the incorporation of water reducer is the 0.15wt%～1.5wt% of gelling material gross weight.
Further, water reducer is naphthalene series high-efficiency water-reducing agent, and the incorporation of naphthalene series high-efficiency water-reducing agent is the 0.7wt%～1.5wt% of gelling material gross weight.
Further, water reducer is high-efficiency water-reducing agent of poly-carboxylic acid, and the incorporation of described high-efficiency water-reducing agent of poly-carboxylic acid is the 0.15wt%～0.5wt% of described gelling material gross weight.
Further, fine aggregate is natural sand or artificial sand, and coarse aggregate is natural rubble or artificial rubble, and the sand coarse aggregate ratio of pump concrete is 36～45%
Further, the fineness modulus of fine aggregate is 2.0～3.2, silt content≤1.0wt%.
Further, the particle diameter of coarse aggregate is 5～25mm continuous grading, crush values≤10%, faller gill shape granule content≤10wt%.
Further, the water-cement ratio of pump concrete is 0.28～0.42, and unit weight is 2400kg/m
3～2600kg/m
3.
According to a further aspect in the invention, provide a kind of pump concrete premculded pile, by reinforcement cage skeleton and prefabricated the forming of pump concrete process, pump concrete used is above-mentioned pump concrete.
According to a further aspect in the invention, a kind of production method of pump concrete premculded pile is provided, comprise the following steps successively: dress cage, matched moulds, stretch-draw, concrete material preparation, concrete material are pumped into mould, centrifugal forming, atmospheric steam curing, the demoulding and hang stake and autoclave curing, wherein, concrete material preparation comprises the following steps: (1) puts into concrete mixer by fine aggregate and gelling material, stirs until evenly; (2) water of total Water 70wt%～90wt% is put into concrete mixer, stir until evenly; (3) coarse aggregate, water reducer and remaining water are put into concrete mixer successively, stir until evenly, obtain pump concrete.
Gelling material in the raw material of pump concrete of the present invention is the mixture of cement, levigate sand, flyash, and the total content of gelling material is 300～500kg/m
3, wherein the quality sum of flyash and levigate sand accounts for the 5wt%～45wt% of gelling material gross weight.Because flyash has " ball " effect, after mixing in pump concrete, improved the workability of pump concrete, can effectively reduce on the one hand the frictional force between the inner aggregate of pump concrete, can reduce the frictional force between pump concrete and pumping line on the other hand, thereby the resistance of pump concrete in pumping procedure greatly reduced, improved the pump-conveying property of pump concrete; Meanwhile, the cost that is compared to cement due to levigate sand, flyash is lower, and the production cost of pump concrete significantly declines.Adopt the prefabricated pump concrete premculded pile forming of pump concrete of the present invention, production efficiency is higher, and quality product is better.
Embodiment
A kind of typical embodiment according to the present invention, the raw material of pump concrete comprises: gelling material, fine aggregate, coarse aggregate, water reducer and water, wherein, gelling material is the mixture of cement, levigate sand, flyash, and the total content of gelling material is 300～500kg/m
3, wherein the quality sum of flyash and levigate sand accounts for the 5wt%～45wt% of described gelling material gross weight.Flyash has " ball " effect, after mixing in pump concrete, improved the workability of pump concrete, can effectively reduce on the one hand the frictional force between the inner aggregate of pump concrete, can reduce the frictional force between pump concrete and pumping line on the other hand, thereby the resistance of pump concrete in pumping procedure greatly reduced, improved the pump-conveying property of pump concrete, pump rate can improve 5%～15% on the original basis; Meanwhile, the cost that is compared to cement due to levigate sand, flyash is lower, adopts after 5wt%～45wt% place of cement, and the production cost of pump concrete significantly declines.
Preferably, the specific surface area of levigate sand and flyash is 350m
2/ kg～500m
2/ kg, compared with the levigate sand of bigger serface and flyash mixed being added in gelling material, makes pump concrete have better workability and pumpability.
Preferably, cement is that label is not less than 42.5 silicate cement or ordinary Portland cement, selects high-intensity cement, can obtain high-intensity pump concrete finished product.
In the preferred embodiment of the present invention, the incorporation of water reducer is the 0.15wt%～1.5wt% of gelling material gross weight.As long as the selecting of water reducer can meet, make pump concrete be issued to higher intensity and the requirement of workability, pumpability preferably in lower water-cement ratio condition, those skilled in the art can select needed water reducer type flexibly.Preferably, water reducer can be selected naphthalene series high-efficiency water-reducing agent, and incorporation is the 0.7wt%～1.5wt% of gelling material gross weight; Or water reducer can be selected high-efficiency water-reducing agent of poly-carboxylic acid, incorporation is the 0.15wt%～0.5wt% of gelling material gross weight.
In the preferred embodiment of the present invention, fine aggregate is natural sand or artificial sand, and coarse aggregate is natural rubble or artificial rubble, and the sand coarse aggregate ratio of pump concrete is 36～45%, and sand coarse aggregate ratio refers to the mass percent that fine aggregate accounts for coarse-fine aggregate total amount herein.Preferably, the fineness modulus of fine aggregate is 2.0～3.2, silt content≤1.0wt%; The particle diameter of coarse aggregate is that (continuous grading refers to when the standard sieve by a set of regulations size of mesh carries out sizing analysis to coarse aggregate 5～25mm continuous grading, resulting graduation curve is a continuous smooth curve, and between the particle of adjacent grade, there is certain proportionlity), crush values≤10%, faller gill shape granule content≤10wt%.By Optimal Select and the rational proportion of fine aggregate and coarse aggregate, can be so that the overall performance optimization of pump concrete.
In exemplary embodiment of the present invention, the water-cement ratio of pump concrete (being the mass ratio of water and gelling material) is 0.28～0.42, and unit weight is 2400kg/m
3～2600kg/m
3.Visible, pump concrete of the present invention is meeting under the condition of workability, pumpability, has lower water-cement ratio and larger unit weight, thereby obtains larger degree of compactness, higher intensity and the weather resistance of Geng Jia.
Pump in accordance with the present invention is sent concrete precast pile, by reinforcement cage skeleton and prefabricated the forming of above-mentioned pump concrete process, because mixing flyash, the degree of compactness of pump concrete premculded pile is better, can improve pump concrete premculded pile sulfate resistance performance and chemistry-resistant characteristic, reduction hydration heat, improve resistance to elevated temperatures, alleviate particle separation and excreting water phenomenon, contraction and the cracking of minimizing pump concrete premculded pile, and suppress the corrosion of stray current to reinforcing bar in pump concrete premculded pile.
Pump in accordance with the present invention is sent the production method of concrete precast pile, comprises the following steps successively: dress cage, matched moulds, stretch-draw, concrete material preparation, concrete material are pumped into mould, centrifugal forming, atmospheric steam curing, the demoulding and hang stake and autoclave curing.Wherein, concrete material preparation comprises the following steps: (1) puts into concrete mixer by fine aggregate and gelling material, stirs until evenly; (2) water of total Water 70wt%～90wt% is put into concrete mixer, stir until evenly; (3) coarse aggregate, water reducer and remaining water are put into concrete mixer successively, stir until evenly, obtain described pump concrete.By the above-mentioned technical process that progressively reinforced, substep stirs, the pump concrete with good workability, pumpability and higher-strength that can obtain being applicable to making pump concrete premculded pile of the present invention is pumped into expeditiously in the middle of the mould of premculded pile in operation subsequently.
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Below in conjunction with embodiment, describe the present invention in detail.
Embodiment 1
The raw material of pump concrete comprises: gelling material, natural sand, rubble, naphthalene series high-efficiency water-reducing agent and water.The total content of gelling material is 300kg/m
3, by the levigate sand of the cement of 85wt%, the flyash of 5wt% and 10wt%, formed, wherein, the specific surface area of levigate sand is 420m
2/ kg, the specific surface area of flyash is 400m
2/ kg, cement is the silicate cement of label 52.5; The incorporation of naphthalene series high-efficiency water-reducing agent is the 0.7wt% of gelling material gross weight; Sand coarse aggregate ratio is 36%, and wherein, the fineness modulus of natural sand is 2.0, silt content≤1.0wt%, and the particle diameter of rubble is 5～25mm continuous grading, and crush values is 5%, and faller gill shape granule content is 7wt%.
The water-cement ratio of the pump concrete of above-mentioned formula is 0.42, and unit weight is 2500kg/m
3.
Embodiment 2
The raw material of pump concrete comprises: gelling material, natural sand, rubble, high-efficiency water-reducing agent of poly-carboxylic acid and water.The total content of gelling material is 450kg/m
3, by the levigate sand of the cement of 55wt%, the flyash of 10wt% and 35wt%, formed, wherein, the specific surface area of levigate sand is 350m
2/ kg, the specific surface area of flyash is 450m
2/ kg, cement is the ordinary Portland cement of label 52.5; The incorporation of high-efficiency water-reducing agent of poly-carboxylic acid is the 0.15wt% of gelling material gross weight; Sand coarse aggregate ratio is 40%, and wherein, the fineness modulus of natural sand is 2.7, silt content≤1.0wt%, and the particle diameter of rubble is 5～25mm continuous grading, and crush values is 7%, and faller gill shape granule content is 8wt%.
The water-cement ratio of the pump concrete of above-mentioned formula is 0.28, and unit weight is 2400kg/m
3.
Embodiment 3
The raw material of pump concrete comprises: gelling material, natural sand, rubble, naphthalene series high-efficiency water-reducing agent and water.The total content of gelling material is 500kg/m
3, by the levigate sand of the cement of 80wt%, the flyash of 10wt% and 10wt%, formed, wherein, the specific surface area of levigate sand is 500m
2/ kg, the specific surface area of flyash is 350m
2/ kg, cement is the silicate cement of label 52.5; The incorporation of naphthalene series high-efficiency water-reducing agent is the 1.5wt% of gelling material gross weight; Sand coarse aggregate ratio is 45%, and wherein, the fineness modulus of natural sand is 2.5, silt content≤1.0wt%, and the particle diameter of rubble is 5～25mm continuous grading, and crush values is 8%, and faller gill shape granule content is 6wt%.
The water-cement ratio of the pump concrete of above-mentioned formula is 0.32, and unit weight is 2500kg/m
3.
Embodiment 4
The raw material of pump concrete comprises: gelling material, natural sand, rubble, high-efficiency water-reducing agent of poly-carboxylic acid and water.The total content of gelling material is 420kg/m
3, by the levigate sand of the cement of 70wt%, the flyash of 10wt% and 20wt%, formed, wherein, the specific surface area of levigate sand is 450m
2/ kg, the specific surface area of flyash is 420m
2/ kg, cement is the ordinary Portland cement of label 52.5; The incorporation of high-efficiency water-reducing agent of poly-carboxylic acid is the 0.5wt% of gelling material gross weight; Sand coarse aggregate ratio is 42%, and wherein, the fineness modulus of natural sand is 3.2, silt content≤1.0wt%, and the particle diameter of rubble is 5～25mm continuous grading, and crush values is 5%, and faller gill shape granule content is 9wt%.
The water-cement ratio of the pump concrete of above-mentioned formula is 0.30, and unit weight is 2600kg/m
3.
Comparative example 1
The raw material of pump concrete comprises: gelling material, natural sand, rubble, high-efficiency water-reducing agent of poly-carboxylic acid and water.The total content of gelling material is 420kg/m
3, by the cement of 70wt% and the levigate sand of 30wt%, formed, wherein, the specific surface area of levigate sand is 360m
2/ kg, cement is the silicate cement of label 52.5; The incorporation of high-efficiency water-reducing agent of poly-carboxylic acid is the 0.26wt% of gelling material gross weight; Sand coarse aggregate ratio is 43%, and wherein, the fineness modulus of natural sand is 3.0, silt content≤1.0wt%, and the particle diameter of rubble is 5～25mm continuous grading, and crush values is 8%, and faller gill shape granule content is 9wt%.
The water-cement ratio of the pump concrete of above-mentioned formula is 0.34, and unit weight is 2450kg/m
3.
Embodiment 1～4 and comparative example 1 are prepared pump concrete premculded pile by following concrete production process:
(1) described reinforcement cage skeleton is packed into after mould, carry out matched moulds;
(2) described fine aggregate and described gelling material are put into concrete mixer, stir until evenly;
(3) 70wt%～90wt% of the gross weight of described water is put into concrete mixer, stir until evenly;
(4) described coarse aggregate, described water reducer and remaining described water are put into concrete mixer successively, stir until evenly, obtain described pump concrete;
(5) described pump concrete is pumped to the inner chamber of described mould;
(6) the described reinforcement cage skeleton in described mould is carried out to prestressed stretch-draw, 70%～75% of the total tensile strength of deformed bar that stretching force is described reinforcement cage skeleton;
(7) the described mould that described pump concrete and described reinforcement cage skeleton are housed is carried out to centrifugal forming operation after prestressed stretch-draw, until the moulding of pump concrete premculded pile;
(8) after centrifugal forming finishes, remove remaining described pump concrete slurry, then the mould that described pump concrete and described reinforcement cage skeleton are housed is carried out to atmospheric steam curing;
(9) after atmospheric steam curing finishes, slough the described mould of described pump concrete premculded pile, then carry out secondary high-pressure vapor cure, obtain described pump concrete premculded pile finished product.
The pump concrete premculded pile end properties parameter testing result that embodiment 1～4 produces is as shown in table 1:
Table 1
As known from Table 1, two fly ashs and the embodiment 1～4 of levigate sand compare with the comparative example 1 of the levigate sand of admixture only, the average slump of concrete of producing is larger, has good water-retentivity, cohesiveness and pumpability, and especially average pump rate improves greatly; The intensity of the pump concrete premculded pile obtaining after secondary steam maintenance meets the requirement of GB13476-2009 more than all reaching C80 completely; Vitriol drying moistening cycle and freezing-thawing cycles obviously improve, and endurance quality is better; Displacement flux obviously reduces, and has suppressed stray current, protects better the reinforcing bar in pump concrete premculded pile not to be corroded.
As can be seen from the above description, the present invention has realized following technique effect:
(1), reduced production cost
The cost that is compared to cement due to levigate sand, flyash is lower, adopts after 5wt%～45wt% place of cement, and the production cost of pump concrete premculded pile significantly declines.
(2), improved the pump-conveying property of pump concrete
Because flyash has " ball " effect, after mixing in pump concrete, improved the workability of pump concrete, can effectively reduce on the one hand the frictional force between the inner aggregate of pump concrete, can reduce the frictional force between pump concrete and pumping line on the other hand, thereby the resistance of pump concrete in pumping procedure greatly reduced, improved the pump-conveying property of pump concrete, pump rate can improve 5%～15% on the original basis.
(3) product performance of pump concrete premculded pile, have been improved
Because mixing flyash, the degree of compactness of pump concrete premculded pile is better, can improve pump concrete premculded pile sulfate resistance performance and chemistry-resistant characteristic, reduction hydration heat, improve resistance to elevated temperatures, alleviate particle separation and excreting water phenomenon, contraction and the cracking of minimizing pump concrete premculded pile, and suppress the corrosion of stray current to reinforcing bar in pump concrete premculded pile.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a pump concrete, the raw material of described pump concrete comprises: gelling material, fine aggregate, coarse aggregate, water reducer and water, is characterized in that:
Described gelling material is the mixture of cement, levigate sand, flyash, and the total content of described gelling material is 300～500kg/m
3, the quality sum of wherein said flyash and described levigate sand accounts for the 5wt%～45wt% of described gelling material gross weight, and the specific surface area of described levigate sand and described flyash is 350m
2/ kg～500m
2/ kg.
2. pump concrete according to claim 1, is characterized in that, described cement is that label is not less than 42.5 silicate cement or ordinary Portland cement.
3. pump concrete according to claim 1, is characterized in that, the incorporation of described water reducer is the 0.15wt%～1.5wt% of described gelling material gross weight.
4. pump concrete according to claim 3, is characterized in that, described water reducer is naphthalene series high-efficiency water-reducing agent, and the incorporation of described naphthalene series high-efficiency water-reducing agent is the 0.7wt%～1.5wt% of described gelling material gross weight.
5. pump concrete according to claim 3, is characterized in that, described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid, and the incorporation of described high-efficiency water-reducing agent of poly-carboxylic acid is the 0.15wt%～0.5wt% of described gelling material gross weight.
6. pump concrete according to claim 1, is characterized in that, described fine aggregate is natural sand or artificial sand, and described coarse aggregate is natural rubble or artificial rubble, and the sand coarse aggregate ratio of described pump concrete is 36～45%.
7. pump concrete according to claim 6, is characterized in that, the fineness modulus of described fine aggregate is 2.0～3.2, silt content≤1.0wt%.
8. pump concrete according to claim 6, is characterized in that, the particle diameter of described coarse aggregate is 5～30mm continuous grading, crush values≤10%, faller gill shape granule content≤10wt%.
9. pump concrete according to claim 1, is characterized in that, the water-cement ratio of described pump concrete is 0.28～0.42, and unit weight is 2400kg/m
3～2600kg/m
3.
10. a pump concrete premculded pile, by reinforcement cage skeleton and prefabricated the forming of pump concrete process, is characterized in that, described pump concrete is the pump concrete described in any one in claim 1 to 9.
The production method of 11. 1 kinds of pump concrete premculded piles as claimed in claim 10, is characterized in that, comprises the following steps successively:
Dress cage, matched moulds, stretch-draw, concrete material preparation, concrete material are pumped into mould, centrifugal forming, atmospheric steam curing, the demoulding and hang stake and autoclave curing,
Described concrete material preparation comprises the following steps:
(1) fine aggregate and gelling material are put into concrete mixer, stir until evenly;
(2) water of total Water 70wt%～90wt% is put into concrete mixer, stir until evenly;
(3) coarse aggregate, water reducer and remaining water are put into concrete mixer successively, stir until evenly, obtain described pump concrete.
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| CN103669360B (en) * | 2013-11-30 | 2016-01-13 | 国家电网公司 | The application of pumping concrete construction method in the transmission line of electricity of mountain area |
| CN104150828A (en) * | 2014-07-29 | 2014-11-19 | 深圳市顺昌龙商砼服务有限公司 | Pumping concrete, pumping concrete precast pile and production method thereof |
| CN107698188B (en) * | 2017-11-13 | 2020-10-27 | 佛山市南海区沥建混凝土有限公司 | Reinforced pumping agent for concrete |
| CN111348873A (en) * | 2020-02-18 | 2020-06-30 | 中建西部建设湖南有限公司 | Extra-coarse machine-made sand pumping concrete |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182175A (en) * | 2007-11-22 | 2008-05-21 | 重庆大学 | Coal gangue-fly ash foam concrete |
| CN102491702A (en) * | 2011-11-07 | 2012-06-13 | 江苏建华管桩有限公司 | Concrete pile and preparation method thereof |
| CN102503283A (en) * | 2011-11-10 | 2012-06-20 | 江苏建华管桩有限公司 | High-performance concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182175A (en) * | 2007-11-22 | 2008-05-21 | 重庆大学 | Coal gangue-fly ash foam concrete |
| CN102491702A (en) * | 2011-11-07 | 2012-06-13 | 江苏建华管桩有限公司 | Concrete pile and preparation method thereof |
| CN102503283A (en) * | 2011-11-10 | 2012-06-20 | 江苏建华管桩有限公司 | High-performance concrete and preparation method thereof |
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Application publication date: 20121003 Assignee: Jianhua building materials (Zhaoqing) Co., Ltd. Assignor: Jiangsu builds China pipe pile Co., Ltd. Contract record no.: 2015440000561 Denomination of invention: Pump concrete, pump concrete precast pile and production methods of pump concrete and pump concrete precast pile Granted publication date: 20140226 License type: Exclusive License Record date: 20150814 |
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Address after: 212413 Development Zone along the Yangtze River, Shu Shu Town, Jiangsu, Jurong Patentee after: Jianhua building materials (Jiangsu) Co., Ltd. Address before: 212413 Development Zone along the Yangtze River, Shu Shu Town, Jiangsu, Jurong Patentee before: Jiangsu builds China pipe pile Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 212413 Development Zone along the Yangtze River, Shu Shu Town, Jiangsu, Jurong Patentee after: Jianhua building materials (China) Co., Ltd. Address before: 212413 Development Zone along the Yangtze River, Shu Shu Town, Jiangsu, Jurong Patentee before: Jianhua building materials (Jiangsu) Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |