CN104803637A - Preparation method of centrifugal concrete water supply-drainage pipe capable of reducing using amount of binding material - Google Patents
Preparation method of centrifugal concrete water supply-drainage pipe capable of reducing using amount of binding material Download PDFInfo
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- CN104803637A CN104803637A CN201510214860.XA CN201510214860A CN104803637A CN 104803637 A CN104803637 A CN 104803637A CN 201510214860 A CN201510214860 A CN 201510214860A CN 104803637 A CN104803637 A CN 104803637A
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Abstract
The invention discloses a preparation method of a centrifugal concrete water supply-drainage pipe capable of reducing the using amount of a binding material. The preparation method comprises the following steps: (1) preparing and stirring concrete, wherein the total mass of the concrete in every cubic meter is 2380 to 2450 kg, the mass of the binding material is 340 to 375 kg, the mass ratio of water to the binding material is (0.40-0.45):1, the using amount of a water reducing agent is 0.8% to 1.2% of the mass of the binding material, the using amount of an air entraining agent is 0.005% to 0.04% of the mass of the binding material, the balance comprises sand and stone, and the mass ratio of the sand to the stone is (0.32-0.36):1; (2) feeding the stirred concrete to a feeding machine for material distribution, and carrying out mold assembling; (3) carrying out pipeline centrifugation; (4) carrying out steam curing; (5) carrying out pipeline demolding. According to the preparation method, through the addition of the air entraining agent, the using amount of the pipeline binding material is reduced, the amount of residual slurry is reduced, and the influence on strength and durability is avoided.
Description
Technical field
The invention belongs to building material field, particularly a kind of centrifugal type concrete supplying drainage preparation method reducing gel material content.
Background technology
Concrete water supply and sewerage pipeline is the conventional pre-cast concrete products in urban construction.Its molding mode mainly contains that centrifugal forming, roller suspension process, vertical vibrating are shaping, vertical extrusion vibratory compaction, core mould vibrating are shaping, this patent for be the concrete water supply and sewerage pipeline adopting centrifugal formation method.
The production technique of centrifugal type concrete water supply and sewerage pipeline is generally mixed concrete; The concrete mixed is expected in mould by material distributing machine cloth; High speed centrifugation, makes concrete be close to mould, forms annular, and wherein unnecessary water and a part of gelling material is extruded; Topple over remaining slurry, the centrifugal superfluous water extruded and remaining slurry are drained into waste liquid pool; Maintenance, reaches form removal after requirement until pipeline strength.
Because the cracking resistance of water supply and sewerage pipeline, seepage resistance demand are higher, therefore concrete just have employed higher gel material content when mix-design, is generally 400 ~ 450kg/m
3.And also can be found out by above-mentioned production technique, the gelling material in remaining slurry is inoperative to final duct products performance.But this part gelling material cannot be saved again, once save, concrete serviceability is just difficult to the requirement reaching the production technique such as mix, cloth in pipe production.Have scholar to propose, the mix-design of centrifugal pipeline coagulation soil will consider to mix and stir the proportioning of proportioning when feeding intake and shaping rear reality.This has absolutely proved that centrifugal pipeline coagulation soil requires high to serviceability before centrifugal, the centrifugal rear feature high to intensity, life requirement.
But, adopt centrifuging process to produce concrete water supply and sewerage pipeline and can produce byproduct---remaining slurry.Remaining slurry is a part of concrete mortar be extruded in centrifugal process, mainly containing water, cement, mineral admixture, earth, (from sand, stone aggregate surface), water reducer etc.Because the composition of remaining slurry is unstable, difficult quality controls, and is therefore difficult to the production being applied to other concrete products; Some enterprises take remaining slurry reuse technology, increase the complicacy of production and artificial demand, also increase the difficulty that pipeline quality controls.Remaining slurry belongs to pollutent, and condensation is difficult to process after producing intensity, is therefore difficult to discharge.How to process remaining slurry, the problem of Shi Ling concrete duct manufacturing enterprise headache.
Reduce the consumption of gelling material, the object reducing remaining slurry amount and reduce production cost can be reached.Air entrapment agent can improve the workability of fresh concrete cost-effectively, particularly few to gel material content concrete more remarkable effect.But in the production of concrete water supply and sewerage pipeline be traditionally not air-entrained agent, this mainly considers that pipeline maintenance generally adopts vapor cure (hydrothermal curing), and GB 50119-2013 " Technical code for application of admixture in concrete " regulation air entrapment agent and gas tracting subtractive agent should not be used for steam-curing concrete.This is because under High Temperature Curing condition, the gas that air entrapment agent is introduced can produce huge expansion, if the gas content introduced is incorrect, concrete strength even may be caused significantly to decline and weather resistance variation.
Consider in the production technique of centrifugal type concrete water supply and sewerage pipeline have centrifugation step, when centrifugal, the gas that air entrapment agent is introduced can be extruded concrete.That is, add air entrapment agent in the mixed concrete stage, the gas of introducing exists only in the stage such as mix, cloth, and these demands concrete have good serviceability.The gas introduced at eccentric phase air entrapment agent is extruded, and affects very little on concrete intensity, weather resistance.Therefore, propose to adopt the method for air-entrained agent to reduce the thinking of gel material content in concrete.
If air-entrained agent, reduce the consumption of gelling material, also just correspondingly reduce the grout scale of construction.Time centrifugal, a part of gas replaces slurry to be extruded concrete, makes slurry extrusion capacity, and also namely remaining slurry amount reduces.Therefore air-entrained agent can reduce the output of remaining slurry to a certain extent.
Summary of the invention
For solving the high problem of centrifugal type concrete supplying drainage gel material content, the invention provides a kind of centrifugal type concrete supplying drainage preparation method reducing gel material content.By air-entrained agent, make concrete inner introducing proper amount of gas when mix, improve concrete mix workability, be easy to stirring, cloth, thus make concrete still have suitable serviceability when reducing gel material content.In pipeline centrifugal process afterwards, concrete is dense extrusion in high speed centrifugation process, and these gases are extruded, therefore on the intensity of pipeline and weather resistance impact very little.
Object of the present invention is achieved through the following technical solutions:
Reduce a centrifugal type concrete supplying drainage preparation method for gel material content, comprise step:
1) preparation also mixed concrete, described concrete every cubic metre total mass is 2380 ~ 2450kg, wherein gelling material quality is 340 ~ 375kg, the mass ratio of water and gelling material is 0.40 ~ 0.45:1, and water reducer consumption is 0.8 ~ 1.2% of gelling material quality, and air entrapment agent consumption is 0.005 ~ 0.04% of gelling material quality, surplus is sand and stone, wherein the mass ratio of sand and sandstone is 0.32 ~ 0.36:1, and in described gelling material, cement accounts for 60 ~ 80%, and mineral admixture accounts for 20 ~ 40%;
2) concrete mixed is dropped into cloth in feeding machine, mould matched moulds;
3) pipeline is centrifugal, and the gas introduced by air entrapment agent in concrete is extruded;
4) steam curing conservation, curing time is totally 4 ~ 8h;
5) the pipeline demoulding.
Further, in step 3 pipeline centrifugal process comprise successively at a slow speed, middling speed, high speed three phases, the rotating speed in each stage is identical with the technique of time and existing centrifugal type concrete water supply and sewerage pipeline, repeats no more.
Further, the steam curing conservation process of described step 4 comprises quietly stops the stage, is risen to temperature rise period of thermostat temperature, constant temperature stage by quiet temperature of stopping, be down to the temperature-fall period four-stage of ambient temperature by thermostat temperature, the temperature and time in each stage is identical with the technique of existing centrifugal type concrete water supply and sewerage pipeline, repeats no more.
Further, before mixed concrete, described air entrapment agent fully mixes with water reducer in advance, is prepared into gas tracting subtractive agent.
Further, described water reducer is polycarboxylate water-reducer or naphthalene water reducer.
Compared with prior art, tool of the present invention has the following advantages:
1. the present invention effectively can reduce the gel material content 6% ~ 15% of centrifugal type concrete water supply and sewerage pipeline, on concrete serviceability, intensity, weather resistance substantially without impact, thus reduces material cost, enhances competitiveness.
2. the present invention can have byproduct---the output of remaining slurry reduced in centrifugal type concrete water supply and sewerage pipeline production process, reduces remaining slurry processing cost.
3. the present invention only needs to add air entrapment agent when mixed concrete, does not change original technical process, does not also need increase equipment, is convenient to promote.
Embodiment
Below in conjunction with specific embodiment, further concrete detailed description in detail is done to the present invention, but embodiments of the present invention are not limited thereto, and for the processing parameter do not indicated especially, can refer to routine techniques and carry out.
The cement that following examples adopt is China Resources cement P. II 42.5R, and sand is natural river sand (2 district's medium sands, fineness modulus 2.9), and rubble is mixed into continuous grading by particle diameter 5-10mm and 10-20mm two class rubble.
embodiment 1
Reduce a centrifugal type concrete supplying drainage preparation method for gel material content, comprise step:
1) preparation also mixed concrete, described concrete every cubic metre total mass is 2450kg, wherein gelling material quality is 375kg, the mass ratio of water and gelling material is 0.40:1, and water reducer consumption is 1.2% of gelling material quality, and air entrapment agent consumption is 0.005% of gelling material quality, surplus is sand and stone, wherein the mass ratio of sand and sandstone is 0.32:1, and in described gelling material, cement accounts for 60%, and mineral admixture accounts for 40%;
2) concrete mixed is dropped into cloth in feeding machine, mould matched moulds;
3) pipeline is centrifugal, and the gas introduced by air entrapment agent in concrete is extruded;
4) steam curing conservation, curing time is 4h altogether;
5) the pipeline demoulding.
Further, in step 3 pipeline centrifugal process comprise successively at a slow speed, middling speed, high speed three phases.
Further, the steam curing conservation process of described step 4 comprises and quietly stops the stage, risen to temperature rise period of thermostat temperature, constant temperature stage by quiet temperature of stopping, be down to the temperature-fall period four-stage of ambient temperature by thermostat temperature.
Further, described water reducer is 10% solid content polycarboxylate water-reducer.
The concrete parameters of centrifugal type concrete water supply and sewerage pipeline prepared by the present embodiment and performance are in table 1, as seen from Table 1, the present embodiment compares the gel material content that existing centrifugal type concrete water supply and sewerage pipeline technique decreases 6.3%, and other inspection items etc. all meet relevant examination criteria.
embodiment 2
Reduce a centrifugal type concrete supplying drainage preparation method for gel material content, comprise step:
1) preparation also mixed concrete, described concrete every cubic metre total mass is 2400kg, wherein gelling material quality is 355kg, the mass ratio of water and gelling material is 0.42:1, and water reducer consumption is 1.0% of gelling material quality, and air entrapment agent consumption is 0.02% of gelling material quality, surplus is sand and stone, wherein the mass ratio of sand and sandstone is 0.34:1, and in described gelling material, cement accounts for 70%, and mineral admixture accounts for 30%;
2) concrete mixed is dropped into cloth in feeding machine, mould matched moulds;
3) pipeline is centrifugal, and the gas introduced by air entrapment agent in concrete is extruded;
4) steam curing conservation, curing time is 6h altogether;
5) the pipeline demoulding.
Further, in step 3 pipeline centrifugal process comprise successively at a slow speed, middling speed, high speed three phases.
Further, the steam curing conservation process of described step 4 comprises and quietly stops the stage, risen to temperature rise period of thermostat temperature, constant temperature stage by quiet temperature of stopping, be down to the temperature-fall period four-stage of ambient temperature by thermostat temperature.
Further, before mixed concrete, described air entrapment agent fully mixes with water reducer in advance, is prepared into gas tracting subtractive agent.
Further, described water reducer is 10% solid content polycarboxylate water-reducer.
The concrete parameters of centrifugal type concrete water supply and sewerage pipeline prepared by the present embodiment and performance are in table 1, as seen from Table 1, the present embodiment compares the gel material content that existing centrifugal type concrete water supply and sewerage pipeline technique decreases 11.3%, and other inspection items etc. all meet relevant examination criteria.
embodiment 3
Reduce a centrifugal type concrete supplying drainage preparation method for gel material content, comprise step:
1) preparation also mixed concrete, described concrete every cubic metre total mass is 2380kg, wherein gelling material quality is 340kg, the mass ratio of water and gelling material is 0.45:1, and water reducer consumption is 0.8% of gelling material quality, and air entrapment agent consumption is 0.04% of gelling material quality, surplus is sand and stone, wherein the mass ratio of sand and sandstone is 0.36:1, and in described gelling material, cement accounts for 80%, and mineral admixture accounts for 20%;
2) concrete mixed is dropped into cloth in feeding machine, mould matched moulds;
3) pipeline is centrifugal, and the gas introduced by air entrapment agent in concrete is extruded;
4) steam curing conservation, curing time is 8h altogether;
5) the pipeline demoulding.
Further, in step 3 pipeline centrifugal process comprise successively at a slow speed, middling speed, high speed three phases.
Further, the steam curing conservation process of described step 4 comprises quietly stops the stage, is risen to temperature rise period of thermostat temperature, constant temperature stage by quiet temperature of stopping, be down to the temperature-fall period four-stage of ambient temperature by thermostat temperature, described quiet temperature of stopping the stage is 40 ~ 55 DEG C, and the temperature in constant temperature stage is 80 ~ 90 DEG C.
Further, described water reducer is 30% solid content naphthalene water reducer.
The concrete parameters of centrifugal type concrete water supply and sewerage pipeline prepared by the present embodiment and performance are in table 1, as seen from Table 1, the present embodiment compares the gel material content that existing centrifugal type concrete water supply and sewerage pipeline technique decreases 15.0%, and other inspection items etc. all meet relevant examination criteria.
Table 1
| Bench-marking sample | Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| Air entrapment agent volume (%) | 0 | 0.005 | 0.01 | 0.02 |
| Gel material content (kg/m3) | 400 | 375 | 355 | 340 |
| Reduce gel material content (%) | — | 6.3 | 11.3 | 15.0 |
| 28d ultimate compression strength (MPa) | 47.7 | 46.6 | 47.5 | 46.9 |
| 28d displacement flux (C) | 513 | 429 | 490 | 637 |
| Concrete water supply and sewerage pipeline performance * | Qualified | Qualified | Qualified | Qualified |
*concrete water supply and sewerage pipeline Performance Detection is according to the concrete supplying drainage performance requriements in GB11836-2009 " Concrete and reinforced concrete drainage and sewer pipes ".
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from spirit of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. reduce a centrifugal type concrete supplying drainage preparation method for gel material content, it is characterized in that, comprise step:
1) preparation also mixed concrete, described concrete every cubic metre total mass is 2380 ~ 2450kg, wherein gelling material quality is 340 ~ 375kg, the mass ratio of water and gelling material is 0.40 ~ 0.45:1, and water reducer consumption is 0.8 ~ 1.2% of gelling material quality, and air entrapment agent consumption is 0.005 ~ 0.04% of gelling material quality, surplus is sand and stone, wherein the mass ratio of sand and sandstone is 0.32 ~ 0.36:1, and in described gelling material, cement accounts for 60 ~ 80%, and mineral admixture accounts for 20 ~ 40%;
2) concrete mixed is dropped into cloth in feeding machine, mould matched moulds;
3) pipeline is centrifugal, and the gas introduced by air entrapment agent in concrete is extruded;
4) steam curing conservation, curing time is totally 4 ~ 8h;
5) the pipeline demoulding.
2. the centrifugal type concrete supplying drainage preparation method of reduction gel material content according to claim 1, is characterized in that: in step 3 pipeline centrifugal process comprise successively at a slow speed, middling speed, high speed three phases.
3. the centrifugal type concrete supplying drainage preparation method of reduction gel material content according to claim 1, is characterized in that: the steam curing conservation process of described step 4 comprises quietly stops the stage, risen to temperature rise period of thermostat temperature, constant temperature stage by quiet temperature of stopping, be down to the temperature-fall period four-stage of ambient temperature by thermostat temperature.
4. the centrifugal type concrete supplying drainage preparation method of reduction gel material content according to claim 1, it is characterized in that: before mixed concrete, described air entrapment agent fully mixes with water reducer in advance, is prepared into gas tracting subtractive agent.
5. the centrifugal type concrete supplying drainage preparation method of reduction gel material content according to claim 1, is characterized in that: described water reducer is polycarboxylate water-reducer or naphthalene water reducer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106365495A (en) * | 2016-08-31 | 2017-02-01 | 嘉兴禾基新型建材有限公司 | Additive special for steam curing of precast concrete member and preparation method and application thereof |
| CN113800856A (en) * | 2021-10-08 | 2021-12-17 | 厦门超荣建材有限公司 | Concrete drain pipe with good anti-permeability performance and production process thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096114A (en) * | 2007-08-10 | 2008-01-02 | 中山市三和建材有限公司 | High-durability prestressed high-strength concrete pipe pile |
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- 2015-04-30 CN CN201510214860.XA patent/CN104803637A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096114A (en) * | 2007-08-10 | 2008-01-02 | 中山市三和建材有限公司 | High-durability prestressed high-strength concrete pipe pile |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106365495A (en) * | 2016-08-31 | 2017-02-01 | 嘉兴禾基新型建材有限公司 | Additive special for steam curing of precast concrete member and preparation method and application thereof |
| CN113800856A (en) * | 2021-10-08 | 2021-12-17 | 厦门超荣建材有限公司 | Concrete drain pipe with good anti-permeability performance and production process thereof |
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Application publication date: 20150729 |