CN102797253A - Precast concrete pile and manufacturing method thereof - Google Patents
Precast concrete pile and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a precast concrete pile and a manufacturing method thereof. The precast concrete pile is obtained by mounting concrete into a mold mounted with a reinforcement cage framework, closing the mold, tensioning the mold, centrifugally shaping the mold, curing the mold by steam at a normal pressure; releasing the mold and curing the concrete by steam at a high pressure; raw materials of the concrete comprise a cementing material, a fine aggregate, a coarse aggregate, an admixture and water, wherein the fine aggregate is a machine-made sand or a mixture of the machine-made sand and a natural sand; the percentage of the machine-made sand in the fine aggregate by weight is 5-100%; the machine-made sand is obtained by mechanically crushing stone raw materials, such as mine tailings, industrial tailings and the like, screening the crushed stone raw materials in a graded way and removing dust from the screened stone raw materials; fineness modulus of the machine-made sand is 2.3-3.8; grain gradation of the machine-made sand meets requirements on an area 1 or an area 2 of a standard sand; and stone powder content of the machine-made sand is 2-8 wt%. According to the invention, the concrete cost is reduced and resource utilization rate is increased; and the used machine-made sand has the advantages of low silt content and controllable stone powder content, so that the performance of the precast concrete pile is improved.
Description
Technical field
The present invention relates to the concrete building material technical field, in particular to a kind of concrete precast pile and production method thereof.
Background technology
Sand is the main material that concrete is formed, and along with the fast development of builing industry, building sand quantity is increasing; Require increasingly high qualitatively; And the natural sand resource is fewer and feweri, and the problem of the farmland of the qualitative problems of construction of initiation, and destruction thus, water resource is on the rise; Therefore, the Application Research of artificial machine-processed sand is imperative.
Machine-processed sand starting from China's sixties in 20th century; Up to the present; Application study to machine-processed sand is day by day ripe; Its range of application is expanded to systems such as highway, railway, water power, metallurgy by building trade, expand bridge, tunnel and hydraulic engineering to by retaining nurse journey, develops into engineerings such as ordinary concrete, steel concrete, prestressed concrete, pumping of concrete, airtightness concrete and combined bolting and shotcrete from masonry mortar.
Yet; The application of artificial machine-processed sand in high-strength prestressed concrete precast pile at present is quite few, and main cause is: the concrete viscosity that machine-processed sand is produced is big, and mobile performance is relatively poor; To construction and centrifugally all produce certain influence, finally cause the product quality performance not pass a test.So a lot of preformed pile manufacturing enterprises not will consider employment mechanism sand.
Summary of the invention
The invention provides a kind of concrete precast pile and production method thereof, in the prestressed concrete preformed pile, use the problem of being limited to solve higher, the machine-processed sand of natural sand cost.
According to an aspect of the present invention; A kind of concrete precast pile is provided; Be prepared from through mould, matched moulds, stretch-draw, centrifugal forming, atmospheric steam curing, the demoulding, the steam curing at high pressure that reinforcement cage skeleton is installed that concrete is packed into, concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water, wherein; Fines is the mixture of machine-processed sand or itself and natural sand; The percetage by weight of the machine-processed sand in the fines is 5wt%～100wt%, and said machine-processed sand is made through Mechanical Crushing, grating screening and dust removal process by stone raw materials such as mill tailings, industrial wastes, and fineness modulus is 2.3～3.8; Grain composition satisfies the requirement in standard sand 1 district or 2 districts, and content of stone powder is 2wt%～8wt%.
Further, the content of cementitious material is 300～500kg/m
3The solid volume of Admixture is 0.1～1.5% of a cementitious material weight; Concrete water-cement ratio is 0.25～0.40; Concrete sand coarse aggregate ratio is 30～45%.
Further; Cementitious material is made up of the cement of 55wt%～100wt% and the admixture of 0wt%～45wt%; Cement is that strength grade is not less than 42.5 portland cement that meets the GB175 standard or Portland cement, and admixture is one or more the combination in silica flour, slag powders, the flyash.
Further, the specific area of silica flour is 300m
2/ kg～500m
2/ kg; Slag powders is not less than the requirement of S95 in the GB/T18046 standard; Flyash is not less than the requirement of II level flyash in the GB/T1596 standard.
Further, natural sand is river sand or river sand, and fineness modulus is 2.0～3.5, mud content≤2.0wt%.
Further, coarse aggregate is natural rubble, artificial rubble or cobble, and particle diameter is 5～25mm continuous grading, crush values≤10%, faller gill shape granule content≤10wt%.
Further, Admixture is a naphthalene series high-efficiency water-reducing agent, and the solid volume of naphthalene series high-efficiency water-reducing agent is the 0.3wt%～1.5wt% of said cementitious material weight; Perhaps, Admixture is a polycarboxylate high performance dehydragent for the solid volume, and polycarboxylate high performance dehydragent is the 0.1wt%～0.5wt% of said cementitious material weight.
According to another aspect of the present invention; A kind of production method of above-mentioned concrete precast pile is provided; May further comprise the steps successively: concrete preparation, mould, matched moulds, stretch-draw, centrifugal forming, atmospheric steam curing, the demoulding, steam curing at high pressure that concrete is packed into reinforcement cage skeleton is installed; Wherein, the concrete preparation may further comprise the steps: Mechanical Crushing is carried out to machine-processed sandy plain material in (1); (2) the machine-processed sandy plain material through Mechanical Crushing is carried out the grating screening, obtaining fineness modulus is 2.3～3.8, and grain composition satisfies the machine-processed sand of standard sand 1 district or the requirement of 2 districts; (3) the machine-processed sand after the grating screening is carried out dust removal process, controlling its content of stone powder is 2wt%～8wt%; (4) in mixer, add cementitious material, above-mentioned machine-processed sand and optional natural sand, wherein, the percetage by weight that machine-processed sand accounts for itself and natural sand mixture is 5wt%～100wt%, stirs 10～40s; In mixer, add entry then, stir 10～30s, add coarse aggregate; In mixer, add Admixture again, continue to stir, reach 90～180s until clean mixing time, discharging.
Further, in the stretch-draw step, reinforcement cage skeleton is carried out stretch-draw, stretching force is 70～75% of the total tensile strength of prestressed reinforcement.
Further, in the atmospheric steam curing step, thermostat temperature is 65～95 ℃, and curing time is 4～6 hours; In the said steam curing at high pressure step, constant voltage pressure is 1.0 ± 0.05MPa, and thermostat temperature is 160～200 ℃, and curing time is 6～8 hours.
Concrete precast pile of the present invention; Mould, matched moulds, stretch-draw, centrifugal forming, atmospheric steam curing, the demoulding, the steam curing at high pressure that reinforcement cage skeleton is installed is prepared from through concrete is packed into; Concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water; Wherein, fines is the mixture of machine-processed sand or itself and natural sand, and the percetage by weight of the machine-processed sand in the fines is 5wt%～100wt%; And machine-processed sand is made through Mechanical Crushing, grating screening and dust removal process by stone raw materials such as mill tailings, industrial wastes; Fineness modulus is 2.3～3.8, and grain composition satisfies the requirement in standard sand 1 district or 2 districts, and content of stone powder is 2wt%～8wt%.Use the concrete precast pile and the production method thereof of technical scheme of the present invention, reduced dependence, greatly reduce concrete cost the natural sand resource of worsening shortages; Mechanism sand has utilized various discarded mineral resources, produces and does not receive the influence in weather and season, has both solved problem of environmental pollution, has improved resource utilization again; By stone raw materials such as mill tailings, industrial waste are low through the machine-processed sand mud content that Mechanical Crushing, grating screening and dust removal process make, content of stone powder is controlled; Thereby the concrete of producing is when guaranteeing good cohesiveness; Do not reduce flowability; When concrete centrifugal, can be good at even mixing, phenomenons such as the local slump of centrifugal back concrete can not occur, and; An amount of stone flour that mechanism comprises in the sand prepares at concrete and has filling effect, nucleus effect and active effect in the process, has improved service behaviour, mechanical property and the endurance quality of concrete precast pile.
The specific embodiment
To combine the embodiment of the invention below; Technical scheme of the present invention is carried out detailed explanation; But following embodiment only is in order to understand the present invention; And can not limit the present invention, and embodiment and the characteristic among the embodiment among the present invention can make up each other, and the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
In a kind of exemplary embodiment of the present invention; Concrete precast pile is prepared from through mould, matched moulds, stretch-draw, centrifugal forming, atmospheric steam curing, the demoulding, the steam curing at high pressure that reinforcement cage skeleton is installed that concrete is packed into; Concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water; Wherein, fines is the mixture of machine-processed sand or itself and natural sand, and the percetage by weight of the machine-processed sand in the fines is 5wt%～100wt%; And machine-processed sand is made through Mechanical Crushing, grating screening and dust removal process by stone raw materials such as mill tailings, industrial wastes; Fineness modulus is 2.3～3.8, and grain composition satisfies the requirement in standard sand 1 district or 2 districts, and content of stone powder is 2wt%～8wt%.
Adopt in the present invention made sand to substitute natural sand as fines in order to the preparation concrete precast pile; Not only solved the problem of existing high-quality natural river sand, river sand resource worsening shortages; And, reduced concrete cost of production because of the tangible price advantage of machine-processed sand.
Present machine-processed sand on the market is various in style; The standard of raw material and processing technology differs; Cause the quality of machine-processed sand uneven, wherein the machine-processed sand particle surface without dust removal process is wrapped up by earth, greatly reduces the adhesive property of cement cementitious material and machine-processed sand; Machine-processed sand granular size without the grating screening differs simultaneously, causes whole fineness modulus uncontrollable, and the machine-processed sand of discontinuous gradation can not play well " lubricating " and filling effect in concrete simultaneously; An amount of stone flour can improve concrete adhesive aggregation performance, but excessive will influence concrete flowability can, reduce its operating characteristics.Control through machine-processed chiltern amount, content, fineness modulus, grain composition, content of stone powder being carried out strictness among the present invention; Purpose is to seek the machine-processed sand that the best is applicable to concrete precast pile; When can guarantee that concrete has good cohesiveness, do not reduce flowability, and good flowing property has promoted concrete operability; When concrete centrifugal, can be good at even mixing, phenomenons such as the local slump of centrifugal back concrete can not occur.
Include but not limited to building stones, mill tailings and industrial waste etc. in order to the raw material for preparing machine-processed sand in the present invention.This abundant in order to the raw material sources that prepare machine-processed sand, can directly gather materials on the spot, avoided weather and season to preparing the influence of machine-processed sand on the one hand, also solved environmental pollution problems on the other hand, improved resource utilization.
In GB14684-2011 " building sand " standard, the stone flour in the machine-processed sand is the particle of particle diameter less than 75 μ m.In the concrete embodiment of the present invention; In machine-processed sand manufacturing process, pass through raw material Mechanical Crushing, polishing; The generation particle diameter is done less than the particle of 75 μ m and is screened out preservation, controls certain ratio at last and is added in the machine-processed sand finished product, makes machine-processed sand uniform in quality.The stone flour that in machine-processed sand used in the present invention, contains 2wt%～8wt%; An amount of stone flour prepares at concrete and has filling effect, nucleus effect and active effect in the process; Help improving service behaviour, mechanical property and the endurance quality of concrete precast pile, through mixing the machine-processed sand that contains an amount of stone flour, concrete segregation, excreting water phenomenon are almost eliminated; The adhesive aggregation excellent performance; Compactness is improved, and chloride-penetration resistance, resisting erosion of sulfate, freezing tolerance all get a promotion, and helps producing the concrete precast pile of function admirable.
In preferred implementation of the present invention, in the concrete, the content of cementitious material is 300～500kg/m
3, the solid volume of Admixture is 0.1～1.5% of a said cementitious material weight, and concrete water-cement ratio is 0.25～0.40, and concrete sand coarse aggregate ratio is 30%～45%.Wherein, water-cement ratio refers to the part by weight of water and cementitious material, and sand coarse aggregate ratio refers to the mass percent that fines accounts for the coarse-fine aggregate total amount.Through rational proportion to each raw material components of concrete, can so that concrete overall performance further optimize.
Preferably, cementitious material is made up of the cement of 55wt%～100wt% and the admixture of 0wt%～45wt%, and wherein, cement is that strength grade is not less than 42.5 portland cement that meets the GB175 standard or Portland cement; Admixture is one or more the combination in silica flour, slag powders, the flyash.Mix a certain proportion of admixture place of cement, can reduce concrete cost of production, and admixture can also be optimized the mix performance and the service behaviour of cementitious material.
Preferably, in the admixture, the specific area of silica flour is 300m
2/ kg～500m
2/ kg; Slag powders is not less than the requirement of S95 in the GB/T18046 standard; Flyash is not less than the requirement of II level flyash in the GB/T1596 standard.Through selecting for use, help improving concrete mix performance and service behaviour than admixture bigger serface, that have certain activity.
Preferably, natural sand is river sand or river sand, and fineness modulus is 2.0～3.5, mud content≤2.0wt%.Because the rough surface of machine-processed sand own, corner angle are clearly demarcated; When with the machine-processed sand of 100wt% during as fines; Can cause to a certain extent cement thick liquid flowability can reduction, through a certain amount of suitable fineness of arranging in pairs or groups, natural sand that mud content is low, can alleviate these problems.
Preferably; Coarse aggregate is natural rubble, artificial rubble or cobble; Particle diameter is 5～25mm continuous grading (continuous grading is meant when the standard screen with a set of regulations screen size carries out sieve analysis to coarse aggregate, and resulting graduation curve is one continuously along sliding curve, and certain proportionate relationship is arranged between the particle of adjacent grade); Crush values≤10%, faller gill shape granule content≤10wt%.Through the material and the grain composition of choose reasonable coarse aggregate, can so that concrete overall performance further optimize.
In preferred implementation of the present invention, the Admixture of admixture is a naphthalene series high-efficiency water-reducing agent in the concrete, and its solid volume is the 0.3wt%～1.5wt% of cementitious material gross weight; Perhaps, Admixture is a polycarboxylate high performance dehydragent, and its solid volume is the 0.1wt%～0.5wt% of cementitious material gross weight.Except that above-mentioned preferred water reducing agent, those skilled in the art can select needed water reducing agent type flexibly for use, as long as can be so that concrete is issued to higher intensity and mix processing characteristics preferably in lower water-cement ratio condition.
The production method of the concrete precast pile of exemplary embodiments according to the present invention; May further comprise the steps successively: concrete preparation, mould, matched moulds, stretch-draw, centrifugal forming, atmospheric steam curing, the demoulding, steam curing at high pressure that concrete is packed into reinforcement cage skeleton is installed; Wherein, the concrete preparation may further comprise the steps:
(1) machine-processed sandy plain material is carried out Mechanical Crushing;
(2) the machine-processed sandy plain material through Mechanical Crushing is carried out the grating screening, obtaining fineness modulus is 2.3～3.8, and grain composition satisfies the machine-processed sand of standard sand 1 district or the requirement of 2 districts;
(3) the machine-processed sand after the grating screening is carried out dust removal process, controlling its content of stone powder is 2wt%～8wt%;
(3) in mixer, add cementitious material, above-mentioned machine-processed sand and optional natural sand, wherein, the percetage by weight that machine-processed sand accounts for itself and natural sand mixture is 5wt%～100wt%, stirs 10～40s; In mixer, add entry then, stir 10～30s, add coarse aggregate; In mixer, add Admixture again, continue to stir, reach 90～180s until clean mixing time, discharging.
In preferred implementation of the present invention, in the stretch-draw step, reinforcement cage skeleton is carried out stretch-draw, stretching force is 70～75% of the total tensile strength of prestressed reinforcement.Concrete precast pile mainly bears is vertical and horizontal loading, applies after the prestressing force through stretch-draw, when bearing working load, need consume prestressing force earlier, and concrete precast pile itself just begins stressed, thereby has improved the mechanical property of concrete precast pile.
In preferred implementation of the present invention, in the atmospheric steam curing step, thermostat temperature is 65～95 ℃, and curing time is 4～6 hours; In the said steam curing at high pressure step, constant voltage pressure is 1.0 ± 0.05MPa, and thermostat temperature is 160～200 ℃, and curing time is 6～8 hours.Through temperature, pressure and the curing time of reasonable control atmospheric steam curing and steam curing at high pressure, can obtain the concrete precast pile of service behaviour and superior in durability.
Introduce specific embodiment of the present invention and Comparative Examples below:
Embodiment 1
Concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water.The cementitious material total content is 440kg/m
3, form by 55wt% cement and 45wt% silica flour, wherein, cement is the portland cement of strength grade 42.5, the specific area of silica flour is 300m
2/ kg; Water-cement ratio is 0.34; Sand coarse aggregate ratio is 36%; Fines is 95wt% natural sand and 5wt% mechanism sand; Wherein, the natural sand fineness modulus is 2.8, mud content≤2.0wt%; Mechanism sand is made through Mechanical Crushing, grating screening and dust removal process by mill tailings; Fineness modulus is 3.2, and grain composition satisfies the requirement in standard sand II district, and content of stone powder is 4wt%; Coarse aggregate is a rubble, and 5～25mm continuous grading, crush values are 8%, and faller gill shape granule content is 7%; Admixture is a naphthalene series high-efficiency water-reducing agent, and the solid volume is the 0.3wt% of cementitious material gross weight.
Embodiment 2
Concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture, He Shui.The cementitious material total content is 480kg/m
3, form by 80wt% cement and 20wt% flyash, wherein, cement is the Portland cement of strength grade 52.5, flyash satisfies the requirement of II level flyash in the GB/T1596 standard; Water-cement ratio is 0.36; Sand coarse aggregate ratio is 40%; Fines is 30wt% natural sand and 70wt% mechanism sand; Wherein, the natural sand fineness modulus is 2.9, mud content≤2.0wt%; Mechanism sand is made through Mechanical Crushing, grating screening and dust removal process by industrial waste; Fineness modulus is 3.4, and grain composition satisfies the requirement in standard sand II district, and content of stone powder is 5wt%; Coarse aggregate is a rubble, and 5～25mm continuous grading, crush values are 8%, and faller gill shape granule content is 7%; Admixture is a polycarboxylate high performance dehydragent, and the solid volume is the 0.1wt% of cementitious material gross weight.
Embodiment 3
Concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water.The cementitious material total content is 400kg/m3, is made up of 100wt% cement, and wherein, cement is the Portland cement of strength grade 42.5; Water-cement ratio is 0.40; Sand coarse aggregate ratio is 30%; Fines is a 100wt% mechanism sand, and wherein, machine-processed sand is made through Mechanical Crushing, grating screening and dust removal process by mill tailings, and fineness modulus is 2.3, and grain composition satisfies the requirement in standard sand I district, and content of stone powder is 8wt%; Coarse aggregate is a rubble, and 5～25mm continuous grading, crush values are 8%, and faller gill shape granule content is 7%; Admixture is a polycarboxylate high performance dehydragent, and the solid volume is the 0.5wt% of cementitious material gross weight.
Embodiment 4
Concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water.The cementitious material total content is 350kg/m3; Form by 60wt% cement, 20wt% silica flour, 10wt% slag powders and 10wt% flyash; Wherein, Cement is the portland cement of strength grade 52.5, and slag powders satisfies the requirement of S95 level in the GB/T18046 standard, and flyash satisfies the requirement of I level flyash in the GB/T1596 standard; Water-cement ratio is 0.25; Sand coarse aggregate ratio is 45%; Fines is 50wt% natural sand and 50wt% mechanism sand; Wherein, the natural sand fineness modulus is 3.2, mud content≤2.0wt%; Mechanism sand is made through Mechanical Crushing, grating screening and dust removal process by industrial waste; Fineness modulus is 3.8, and grain composition satisfies the requirement in standard sand II district, and content of stone powder is 2wt%; Coarse aggregate is a rubble, and 5～25mm continuous grading, crush values are 8%, and faller gill shape granule content is 7%; Admixture is a naphthalene series high-efficiency water-reducing agent, and the solid volume is the 1.5wt% of cementitious material gross weight.
Comparative Examples
Concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water.The cementitious material total content is 420kg/m3, is made up of 65wt% cement, 30wt% silica flour, 5wt% slag powders, and wherein, cement is the portland cement of strength grade 52.5, and slag powders satisfies the requirement of S95 level in the GB/T18046 standard; Water-cement ratio is 0.30; Sand coarse aggregate ratio is 35%; Fines is a 100wt% natural sand, and wherein, the natural sand fineness modulus is 2.8, mud content≤2.0wt%; Coarse aggregate is a rubble, and 5～25mm continuous grading, crush values are 8%, and faller gill shape granule content is 7%; Admixture is a naphthalene series high-efficiency water-reducing agent, and the solid volume is the 0.6wt% of cementitious material gross weight.
Embodiment 1～4 and Comparative Examples adopt following steps to prepare concrete precast pile:
(1) preparation concrete: in mixer, add fines, cementitious material, stir 10～40s; In mixer, add entry then, stir 10～30s, add coarse aggregate; In mixer, add Admixture again, continue to stir, reach 90～180s until clean mixing time;
The concrete that (2) will stir is in advance evenly packed into and has been equipped with in the mould of reinforcement cage skeleton;
(3) matched moulds and reinforcement cage skeleton carried out stretch-draw, stretching force is 70～75% of the total tensile strength of prestressed reinforcement;
(4) concrete mould will be housed and carry out the centrifugal forming operation, until concrete prefabricated forming pile;
(5) treat centrifugal end after, the mould that concrete and cage of reinforcement cage are housed is carried out atmospheric steam curing, thermostat temperature is 65～95 ℃, curing time is 4～6 hours;
(6) with the concrete precast pile demoulding behind the atmospheric steam curing;
(7) concrete precast pile after the demoulding is sent into autoclave and carry out steam curing at high pressure, constant voltage pressure is 1.0 ± 0.05MPa, and thermostat temperature is 160～200 ℃, and curing time is 6～8 hours.
The compressive strength and the endurance quality index of the concrete precast pile that embodiment 1,2,3,4 and Comparative Examples are prepared detect, and testing result is seen table 1:
The testing performance index result of table 1 concrete precast pile
Can find out the concrete precast pile that the concrete precast pile that the concrete of the certain proportion mechanism that the is mixed with sand of the embodiment of the invention 1～4 makes makes at the ordinary concrete that only is mixed with natural sand that all is superior to Comparative Examples aspect intensity, the endurance quality index from the test data of table 1.
In addition; Each concrete precast pile of the embodiment of the invention 1～4 has been carried out the detection of anti-bending strength; The testing result data are as shown in table 2; From table 2, can find out the mechanical property requirements of the concrete precast pile of defined among the cracking resistance moment of flexure of each concrete precast pile of the embodiment of the invention 1～4 and the equal National standard GB13476-2009 of ultimate bending moment.
The anti-bending strength testing result of table 2 concrete precast pile
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. concrete precast pile; Mould, matched moulds, stretch-draw, centrifugal forming, atmospheric steam curing, the demoulding, the steam curing at high pressure that reinforcement cage skeleton is installed is prepared from through concrete is packed into; Said concrete raw material comprises: cementitious material, fines, coarse aggregate, Admixture and water is characterized in that:
Said fines is the mixture of machine-processed sand or itself and natural sand; The percetage by weight of the machine-processed sand in the said fines is 5wt%～100wt%; Said machine-processed sand is made through Mechanical Crushing, grating screening and dust removal process by stone raw materials such as mill tailings, industrial wastes; Fineness modulus is 2.3～3.8, and grain composition satisfies the requirement in standard sand 1 district or 2 districts, and content of stone powder is 2wt%～8wt%.
2. concrete precast pile according to claim 1 is characterized in that, the content of said cementitious material is 300～500kg/m
3The solid volume of said Admixture is 0.1～1.5% of a said cementitious material weight; Said concrete water-cement ratio is 0.25～0.40; Said concrete sand coarse aggregate ratio is 30～45%.
3. concrete precast pile according to claim 2; It is characterized in that; Said cementitious material is made up of the cement of 55wt%～100wt% and the admixture of 0wt%～45wt%; Said cement is that strength grade is not less than 42.5 portland cement that meets the GB175 standard or Portland cement, and said admixture is one or more the combination in silica flour, slag powders, the flyash.
4. concrete precast pile according to claim 3 is characterized in that, the specific area of said silica flour is 300m
2/ kg～500m
2/ kg; Said slag powders is not less than the requirement of S95 in the GB/T18046 standard; Said flyash is not less than the requirement of II level flyash in the GB/T1596 standard.
5. concrete precast pile according to claim 1 is characterized in that, said natural sand is river sand or river sand, and fineness modulus is 2.0～3.5, mud content≤2.0wt%.
6. concrete precast pile according to claim 1 is characterized in that, said coarse aggregate is natural rubble, artificial rubble or cobble, and particle diameter is 5～25mm continuous grading, crush values≤10%, faller gill shape granule content≤10wt%.
7. concrete precast pile according to claim 2 is characterized in that, said Admixture is a naphthalene series high-efficiency water-reducing agent, and the solid volume of said naphthalene series high-efficiency water-reducing agent is the 0.3wt%～1.5wt% of said cementitious material weight; Perhaps, said Admixture is a polycarboxylate high performance dehydragent for the solid volume, and said polycarboxylate high performance dehydragent is the 0.1wt%～0.5wt% of said cementitious material weight.
8. production method like preformed pile on each described coagulation in the claim 1 to 7 may further comprise the steps successively:
Concrete preparation, mould, matched moulds, stretch-draw, centrifugal forming, atmospheric steam curing, the demoulding, steam curing at high pressure that concrete is packed into reinforcement cage skeleton is installed,
It is characterized in that said concrete preparation may further comprise the steps:
(1) machine-processed sandy plain material is carried out Mechanical Crushing;
(2) the machine-processed sandy plain material through Mechanical Crushing is carried out the grating screening, obtaining fineness modulus is 2.3～3.8, and grain composition satisfies the machine-processed sand of standard sand 1 district or the requirement of 2 districts;
(3) the machine-processed sand after the grating screening is carried out dust removal process, controlling its content of stone powder is 2wt%～8wt%;
(4) in mixer, add cementitious material, said machine-processed sand and optional natural sand, wherein, the percetage by weight that said machine-processed sand accounts for itself and natural sand mixture is 5wt%～100wt%, stirs 10～40s; In mixer, add entry then, stir 10～30s, add coarse aggregate; In mixer, add Admixture again, continue to stir, reach 90～180s until clean mixing time, discharging.
9. the production method of concrete precast pile according to claim 8 is characterized in that, in the said stretch-draw step, reinforcement cage skeleton is carried out stretch-draw, and stretching force is 70～75% of the total tensile strength of prestressed reinforcement.
10. the production method of preformed pile is characterized in that on the coagulation according to claim 8, and in the said atmospheric steam curing step, thermostat temperature is 65～95 ℃, and curing time is 4～6 hours; In the said steam curing at high pressure step, constant voltage pressure is 1.0 ± 0.05MPa, and thermostat temperature is 160～200 ℃, and curing time is 6～8 hours.
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966097A (en) * | 2012-11-30 | 2013-03-13 | 华侨大学 | Novel composite foundation with vertical bearing piles |
| CN103304188A (en) * | 2013-05-23 | 2013-09-18 | 福建建华管桩有限公司 | Method for producing precast concrete component |
| CN103408274A (en) * | 2013-08-02 | 2013-11-27 | 深圳海龙建筑制品有限公司 | Slag powder concrete material for production of concrete fabricated part and production method for concrete fabricated part |
| CN105014855A (en) * | 2015-06-19 | 2015-11-04 | 李国峰 | Technology for forming high-viscous material in mould |
| CN105110714A (en) * | 2015-08-27 | 2015-12-02 | 安徽芜湖飞琪水泥制品有限公司 | Pyrite slag cement pile and preparation method thereof |
| CN105218016A (en) * | 2015-09-01 | 2016-01-06 | 招商局重庆交通科研设计院有限公司 | Without the high-strength high-performance machine-made sand concrete of mineral spike |
| CN105236848A (en) * | 2015-08-27 | 2016-01-13 | 安徽芜湖飞琪水泥制品有限公司 | Steel slag cement piles and preparation method thereof |
| CN105330228A (en) * | 2015-08-18 | 2016-02-17 | 国网山东省电力公司临沂供电公司 | Insulation electric pole |
| CN105418015A (en) * | 2015-09-21 | 2016-03-23 | 国网山东费县供电公司 | Concrete utility pole for transmission line |
| CN105503065A (en) * | 2015-08-16 | 2016-04-20 | 国网山东省电力公司临沂供电公司 | Novel compound electric pole |
| CN105801031A (en) * | 2016-04-15 | 2016-07-27 | 四川省交通运输厅公路规划勘察设计研究院 | Design method for mix proportion of artificial aggregate concrete |
| CN107117887A (en) * | 2017-06-08 | 2017-09-01 | 上海百理新材料科技股份有限公司 | A kind of method that use Machine-made Sand prepares fiber pump concrete |
| CN107352919A (en) * | 2017-08-18 | 2017-11-17 | 杨小英 | Prestressed high-strength concrete pile |
| CN107365118A (en) * | 2017-07-18 | 2017-11-21 | 辽宁煜梽新型建材有限公司 | A kind of concrete and preparation method thereof |
| CN107382206A (en) * | 2017-08-18 | 2017-11-24 | 杨小英 | A kind of preparation method of prestressed high-strength concrete pile |
| CN107512885A (en) * | 2017-07-21 | 2017-12-26 | 鞍钢矿山建设有限公司 | A kind of ready-mixed concrete and production method with artificial sand and thin river sand |
| CN107524263A (en) * | 2017-07-11 | 2017-12-29 | 广东鸿业管桩有限公司 | A kind of PHC tubing strings mixed again using silica flour and slag powders |
| CN109485351A (en) * | 2019-01-07 | 2019-03-19 | 河北联众谊诚混凝土有限公司 | A kind of concrete and its processing technology |
| CN109534764A (en) * | 2018-11-22 | 2019-03-29 | 盐城欣昌新型建材有限公司 | Utilize the reinforced photovoltaic cement pipe pile and preparation method thereof of regeneration concrete |
| CN109760198A (en) * | 2017-11-09 | 2019-05-17 | 温州强宏建材有限公司 | A kind of prestressing force prefabricated pile production technology |
| CN110372243A (en) * | 2019-08-15 | 2019-10-25 | 广州铁诚工程质量检测有限公司 | Machine-made Sand and preparation method thereof and the concrete prepared using the Machine-made Sand |
| CN110759679A (en) * | 2019-11-13 | 2020-02-07 | 南通海华建材有限公司 | Preparation process of high-strength concrete pipe pile |
| CN110818326A (en) * | 2019-10-28 | 2020-02-21 | 福建宝丰管桩有限公司 | Artificial sand precast concrete pipe pile and manufacturing process |
| CN111805724A (en) * | 2020-07-17 | 2020-10-23 | 广东鸿业管桩有限公司 | Tubular pile preparation process |
| CN116082003A (en) * | 2023-02-23 | 2023-05-09 | 常州大学 | Machine-made sand recycled concrete of composite floor slab member and preparation method thereof |
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Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966097A (en) * | 2012-11-30 | 2013-03-13 | 华侨大学 | Novel composite foundation with vertical bearing piles |
| CN103304188A (en) * | 2013-05-23 | 2013-09-18 | 福建建华管桩有限公司 | Method for producing precast concrete component |
| CN103304188B (en) * | 2013-05-23 | 2015-03-25 | 福建建华管桩有限公司 | Method for producing precast concrete component |
| CN103408274A (en) * | 2013-08-02 | 2013-11-27 | 深圳海龙建筑制品有限公司 | Slag powder concrete material for production of concrete fabricated part and production method for concrete fabricated part |
| CN103408274B (en) * | 2013-08-02 | 2015-11-11 | 深圳海龙建筑制品有限公司 | For the production of the slag powder concrete material of concrete precast element and the production method of concrete precast element thereof |
| CN105014855A (en) * | 2015-06-19 | 2015-11-04 | 李国峰 | Technology for forming high-viscous material in mould |
| CN105503065A (en) * | 2015-08-16 | 2016-04-20 | 国网山东省电力公司临沂供电公司 | Novel compound electric pole |
| CN105330228A (en) * | 2015-08-18 | 2016-02-17 | 国网山东省电力公司临沂供电公司 | Insulation electric pole |
| CN105110714A (en) * | 2015-08-27 | 2015-12-02 | 安徽芜湖飞琪水泥制品有限公司 | Pyrite slag cement pile and preparation method thereof |
| CN105236848A (en) * | 2015-08-27 | 2016-01-13 | 安徽芜湖飞琪水泥制品有限公司 | Steel slag cement piles and preparation method thereof |
| CN105218016A (en) * | 2015-09-01 | 2016-01-06 | 招商局重庆交通科研设计院有限公司 | Without the high-strength high-performance machine-made sand concrete of mineral spike |
| CN105418015B (en) * | 2015-09-21 | 2017-10-13 | 国网山东费县供电公司 | A kind of concrete wire for transmission line of electricity |
| CN105418015A (en) * | 2015-09-21 | 2016-03-23 | 国网山东费县供电公司 | Concrete utility pole for transmission line |
| CN105801031A (en) * | 2016-04-15 | 2016-07-27 | 四川省交通运输厅公路规划勘察设计研究院 | Design method for mix proportion of artificial aggregate concrete |
| CN107117887A (en) * | 2017-06-08 | 2017-09-01 | 上海百理新材料科技股份有限公司 | A kind of method that use Machine-made Sand prepares fiber pump concrete |
| CN107524263A (en) * | 2017-07-11 | 2017-12-29 | 广东鸿业管桩有限公司 | A kind of PHC tubing strings mixed again using silica flour and slag powders |
| CN107365118A (en) * | 2017-07-18 | 2017-11-21 | 辽宁煜梽新型建材有限公司 | A kind of concrete and preparation method thereof |
| CN107512885A (en) * | 2017-07-21 | 2017-12-26 | 鞍钢矿山建设有限公司 | A kind of ready-mixed concrete and production method with artificial sand and thin river sand |
| CN107352919A (en) * | 2017-08-18 | 2017-11-17 | 杨小英 | Prestressed high-strength concrete pile |
| CN107382206A (en) * | 2017-08-18 | 2017-11-24 | 杨小英 | A kind of preparation method of prestressed high-strength concrete pile |
| CN109760198A (en) * | 2017-11-09 | 2019-05-17 | 温州强宏建材有限公司 | A kind of prestressing force prefabricated pile production technology |
| CN109534764A (en) * | 2018-11-22 | 2019-03-29 | 盐城欣昌新型建材有限公司 | Utilize the reinforced photovoltaic cement pipe pile and preparation method thereof of regeneration concrete |
| CN109485351A (en) * | 2019-01-07 | 2019-03-19 | 河北联众谊诚混凝土有限公司 | A kind of concrete and its processing technology |
| CN110372243A (en) * | 2019-08-15 | 2019-10-25 | 广州铁诚工程质量检测有限公司 | Machine-made Sand and preparation method thereof and the concrete prepared using the Machine-made Sand |
| CN110818326A (en) * | 2019-10-28 | 2020-02-21 | 福建宝丰管桩有限公司 | Artificial sand precast concrete pipe pile and manufacturing process |
| CN110759679A (en) * | 2019-11-13 | 2020-02-07 | 南通海华建材有限公司 | Preparation process of high-strength concrete pipe pile |
| CN111805724A (en) * | 2020-07-17 | 2020-10-23 | 广东鸿业管桩有限公司 | Tubular pile preparation process |
| CN111805724B (en) * | 2020-07-17 | 2021-04-02 | 广东鸿业管桩有限公司 | Tubular pile preparation process |
| CN116082003A (en) * | 2023-02-23 | 2023-05-09 | 常州大学 | Machine-made sand recycled concrete of composite floor slab member and preparation method thereof |
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