CN105384409B - One kind exempts from pressure and steams PHC pile tube concrete - Google Patents
One kind exempts from pressure and steams PHC pile tube concrete Download PDFInfo
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- CN105384409B CN105384409B CN201510893520.4A CN201510893520A CN105384409B CN 105384409 B CN105384409 B CN 105384409B CN 201510893520 A CN201510893520 A CN 201510893520A CN 105384409 B CN105384409 B CN 105384409B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Exempt from pressure the invention discloses one kind and steam PHC pile tube concrete, belong to cement technology field.The concrete of the present invention includes the following raw material configured by weight：425~500kg/m of portland cement3, middle 670~700kg/m of sand3, 1130~1200kg/m of stone3, 119~140kg/m of water consumption3, 8~9.5kg/m of naphthalene series high-efficiency water-reducing agent3；The portland cement includes the following raw material constituted by mass percentage：Portland clinker 76.85~93%, phosphorus slag 5~18%, silicon ash 2~5%, sodium gluconate 0~0.15%.Present invention mainly solves in the prior art, exempting from pressure to steam PHC concrete in maintenance processes, occur DEF reactions, the problem of influenceing volume stability of concrete and durability, with pile tube volume stability and durability is improved, shortens the advantage of duration.
Description
Technical field
Exempt from pressure the present invention relates to a kind of concrete-pile, more particularly to one kind and steam PHC pile tube concrete.
Background technology
At present, high-strength concrete tubular pile is after centrifugal forming, first using atmospheric steam curing, undergo it is quiet stop, heat up, it is permanent
Temperature, cooling four-stage, temperature is at 60 DEG C~70 DEG C, and the time is 4~7 hours.Then it is stripped, then carries out autoclave curing.Pressure
Steam test maintenance steams kettle using pressure, and steam pressure reaches 0.9MPa~1.0MPa during maintenance, and temperature is lasted for 7 at 180 DEG C or so
~10 hours.Concrete is during steam curing, due to the quick rise and reduction of temperature, tubular pile concrete internal-external temperature difference mistake
Greatly, tubular pile body is also easy to produce crack, or even cracking, causes concrete tubular pile intensity decreases, makes pile tube product quality degradation.
It is drained off in addition, having a large amount of heat energy in autoclave curing high energy consumption, maintenance processes, causes energy waste, and it is coal-fired
Substantial amounts of flue gas can be produced, flue gas need to be handled, the environmental burden of enterprise has been aggravated.Further, pressure steams kettle equipment investment
Greatly, complex process, particularly safety hazards are more, have huge social benefit and economic effect so saving pressure and steaming link
Benefit.
Phosphorus slag is that the hot method of rock phosphate in powder produces the industrial residue discharged during yellow phosphorus, often produces 1t yellow phosphorus, about produces
8~10t phosphorus slags.In recent years, developing rapidly with China's phosphorus production industry, the discharge capacity of phosphorus slag also increases therewith, every year
All in 5,000,000 more than t, and cumulative year after year.Substantial amounts of phosphorus slag accumulation, substantial amounts of soil is not only taken up, and in phosphorus slag
Harmful substance can permeate the ground with rainwater, cause the pollution of underground water.Meanwhile, it also result in the waste of a large amount of residue resources；Cause
This, the utilization rate for increasing phosphorus slag resource is very urgent.
State Intellectual Property Office discloses an Authorization Notice No. on April 10th, 2013 for CN103030342B, title
For the patent of invention of " a kind of non-autoclaved prestressed high-strength centrifuge pipe pile and preparation method thereof ", preparation method disclosed in the patent is such as
Under：A, by 445kg/m3Cement, 70 kg/m3Microballon, 35 kg/m3Silicon ash, 720 kg/m3Sand, 1191 kg/m3Rubble, 1.9
kg/m3Water reducer, 104.5 kg/m3Water, wherein water-cement ratio 0.19 are mixed and made into concrete；B, using above-mentioned concrete in punching block
After middle cloth, matched moulds tensioning, centrifugal forming is made in prestressed concrete pipe pile, the centrifugal molding process and divided on centrifuge
Low speed, middling speed, high speed, high speed four-stage；Prestressed concrete pipe pile after C, centrifugal forming carries out an atmospheric steam
Maintenance or water are supported, and control thermostat temperature is at 75 DEG C~95 DEG C；Then park naturally, 7 days, concrete strength 118.0MPa.
Pile tube made from the patent needs nature to park 7 days after being conserved at 75 DEG C~95 DEG C, and curing time is longer, causes the production cycle long,
Inefficiency.
And for example publication number CN104960086A, the invention of entitled " a kind of to exempt from the production method that pressure steams concrete-pile " is special
Profit, this method excites flyash activity mainly by exciting agent, increases concrete strength, but exciting agent is by diethylene glycol (DEG), three ethanol
Amine and dispersing agent NNO are added in expanded perlite and are made, and preparation method is complicated and uneconomical；And publication number CN104742249A
Patent by adding solid glass micro-bead and 95 grades of phosphorus slags reach and exempt from the purpose that pressure is steamed, but cost is high, shrinks greatly.
A certain amount of gypsum is often included in non-evaporating pressure concrete of the prior art, to play a part of slow setting, but is being had
In the presence of gypsum, the C in cement3A hydrated products are AFt（Calcium trisulphoaluminate hydrate）And AFm（Single sulfur type aquation
Calcium sulphoaluminate）, for normal pressure is steam-cured, gypsum presence can cause the generation of delayed ettringite, referred to as DEF phenomenons, and DEF quilts
The DEF reactions being considered in a kind of breaking reaction of potential influence concrete durability, concrete refer to steam curing knot
Normal warm and humid maintenance stage, low steady low sulfur type calcium sulphoaluminate after beam（AFm）To entringite（AFt）What transformation was caused.It is related
Research show that the optimal permission curing temperature for being prevented effectively from DEF reactions is 65~70 DEG C, but improves coagulation within a short period of time
The intensity of soil, shortens the duration, and the curing temperature is too low, is unfavorable for industrialized production.
The content of the invention
The present invention is in order to solve in the prior art, and the presence in tubular pile concrete because of gypsum causes delayed ettringite to react,
The problem of influenceing concrete durability, proposes that one kind exempts from pressure and steams PHC pile tube concrete, by selecting special cement clinker and its
Using cooperatively for his raw material, in the case of there are currently no gypsum in fact, can also reach the use requirement of tubular pile concrete, with raising
The volume stability and durability of pile tube and the advantage for shortening the duration.
In order to realize foregoing invention purpose, technical scheme is as follows：
One kind exempts from pressure and steams PHC pile tube concrete, it is characterised in that：Including the following raw material configured by weight：Silicate
425~500kg/m of cement3, middle 670~700kg/m of sand3, 1130~1200kg/m of stone3, 119~140kg/m of water consumption3, naphthalene
8~9.5kg/m of series high-efficiency water-reducing agent3；The portland cement includes the following raw material constituted by mass percentage：Silicate cement
Mud clinker 76.85~93%, phosphorus slag 5~18%, silicon ash 2~5%, sodium gluconate 0~0.15%；The specific surface area of the phosphorus slag is
400~450m2/kg。
Portland clinker of the present invention is entitled " a kind of small by Application No. 201510378815.8
The patent of grain Portland clinker and preparation method thereof " is prepared.
The portland cement meets following technical indicator：350~420m of specific surface area2/ kg, 80 μm of square hole screens are tailed over not
More than 10%；Presetting period must not must not be later than 240min earlier than 15min, final setting time；3d rupture strengths are more than 3.5MPa, resist
Compressive Strength is more than 20MPa, and 28d rupture strengths are more than 5MPa, and compression strength is more than 45MPa.
The clay content of the middle sand is no more than 0.8%, and modulus of fineness is 2.8~3.0, and sand level matches somebody with somebody distribution：4.75mm
Standard screen tail over account for 0~7%, 2.36mm standard screens tail over account for 16~24%, 1.18mm standard screens tail over account for 17~20%, 0.6mm mark
Standard, which tails over to account for 18~21%, 0.315mm standard screens and tail over to account for 15~18%, 0.15mm standard screens and tail over, accounts for 14~27%.
Described stone is rubble, 5~20mm of particle diameter；Stone level is with distribution：16mm standard screens screen over-size is 15~30%,
9.5mm standard screens screen over-size is that 20~55%, 4.75mm standard screens screen over-size is 30~50%.
It is of the present invention to exempt from the preparation method that pressure steams PHC pile tube concrete, it is characterised in that：Comprise the following steps：
1）By by the proportioning cement, middle sand, stone, water, the high efficiency water reducing agent that weigh be put into stirrer for mixing it is uniform after into
Type；
2）It is quiet to stop
It is quiet under 20~30 DEG C of environment to stop 2~4h after concrete formation；
3）By step 2）It is quiet stop after concrete be placed in steam curing box, 90~98 DEG C are at the uniform velocity warming up in 2~3h,
4~6h of subsequent 90~98 DEG C of insulations；
4）The natural cooling demoulding is produced.
Beneficial effects of the present invention：
（1）The present invention makees binder materials using not gypseous portland cement, and multiple by sodium gluconate and phosphorus slag
Close the setting time of regulation cement, with conventional portland cement of the prior art, the silicate cement such as based on calcium silicates
Mud clinker and less than 5% lime stone or granulated blast-furnace slag, the hydraulic cementing materials that proper amount of gypsum is levigate to be made are compared, this
Invention avoids the introducing of sulfate ion, so that solving pressure of the prior art of exempting from steams concrete tubular pile at 80~100 DEG C
During maintenance, the problem of there is DEF phenomenons, influence pile tube durability；And a small amount of silicon ash is added as packing material, with cost
Low, with short production cycle advantage.
Compared with pressure of the prior art steams concrete, the present invention saves the process of HTHP maintenance, saves the energy and disappears
Consumption, in actual production, per mitron, stake can save about 21.6 yuan, so as to improve the economic benefit of cement production enterprise；This hair
It is bright relative to conserved at 65~75 DEG C exempt from pressure steam tubular pile concrete for, ensure quality while, its preparation efficiency is more
Height, so as to realize the purpose for shortening the duration.
Through retrieval, the record for the concrete for being entirely free of gypsum is there are no, as long as with the presence of gypsum in tubular pile concrete, such as
Fruit is conserved at relatively high temperatures, will certainly cause the problem of pile tube volume is durable poor, and the application is solved this problem in that well.
（2）The present invention by the further selection of centering sand and stone, sand, stone proportioning it is good, sand coarse aggregate ratio is moderate so that this
The concrete of invention is more close in centrifugal forming, the problem of balancing the mobility and stability of concrete.
Brief description of the drawings
Fig. 1 is conserved after 5h for the concrete of the embodiment of the present invention 5 at 95 DEG C, the concrete of standard curing to 28 day age
Surface；
Fig. 2 is that common pile tube PHC concrete is conserved after 5h at 95 DEG C, the concrete table of standard curing to 28 day age
Face.
Embodiment
Embodiment 1
One kind exempts from pressure and steams PHC pile tube concrete, and the raw material of following weight is contained in the concrete per m3：Portland cement
500kg, naphthalene series high-efficiency water-reducing agent 9.5kg, middle sand 670kg, stone 1200kg, water 140kg.
Portland cement includes following raw material by mass percentage in the present embodiment：Portland clinker 93%, phosphorus
Slag 5%, silicon ash 2.3%, sodium gluconate 0.15%；The portland cement specific surface area 360m2/ kg, 80 μm of square hole screens are tailed over
1%；Presetting period 20min, final setting time 40min；3d rupture strength 5.8MPa, compression strength 32.5MPa, 28d rupture strength
7.8MPa, compression strength 52.5MPa.
In the present embodiment, the clay content of middle sand is 0.3%, and fineness modulus is 3.0, and level is with distribution：4.75mm standard screen is tailed over
Account for 6%, 2.36mm standard screens and tail over to account for 20%, 1.18mm standard screens and tail over to account for 17%, 0.6mm standard screens and tail over and account for 20%, 0.315mm
Standard screen, which tails over to account for 18%, 0.15mm standard screens and tail over, accounts for 19%.
In the present embodiment, stone is rubble, and 5~20mm of particle diameter, stone realizes tight distribution, and level is with distribution：16mm standards
It is that 15%, 9.5mm standard screens screen over-size is that 55%, 4.75mm standard screens screen over-size is 30% to sieve screen over-size.
The preparation method of the concrete of the present embodiment is：Cement, middle sand, stone, water, the efficient diminishing that will be weighed by proportioning
Agent, which is put into, quiet under 30 DEG C of environment after the uniform formation of concrete of stirrer for mixing, concrete formation stops 2h；It is subsequently placed in steam
In curing box, in being at the uniform velocity warming up to 90~98 DEG C in 2h；5.5h is incubated at 90~98 DEG C, then the demoulding is after natural cooling
.
Embodiment 2
One kind exempts from pressure and steams PHC pile tube concrete, and the raw material of following weight is contained in the concrete per m3：Portland cement
425kg, naphthalene series high-efficiency water-reducing agent 8kg, middle sand 700kg, stone 1170kg, water 119kg.
The portland cement of the present embodiment includes following raw material by mass percentage：Portland clinker 77%, phosphorus
Slag 18%, silicon ash 5%, sodium gluconate 0%；The specific surface area of the phosphorus slag of the present embodiment is 400 m2/kg。
The specific surface area 380m of the portland cement of the present embodiment2/ kg, 80 μm of square hole screens tail over 0.5%；Presetting period
18min, final setting time 37min；3d rupture strength 4.8MPa, compression strength 25.5MPa, 28d rupture strength 5.7MPa, pressure resistance
Spend 45.5MPa.
In the present embodiment, the clay content of middle sand is 0.3%, and fineness modulus is 3.0, and sand level matches somebody with somebody distribution：4.75mm mark
Standard is tailed over to account for 6%, 2.36mm standard screens and tail over to account for 20%, 1.18mm standard screens and tail over to account for 17%, 0.6mm standard screens and tail over and accounted for
20%, 0.315mm standard screen, which tail over to account for 18%, 0.15mm standard screens and tail over, accounts for 19%.
In the present embodiment, stone is rubble, 5~20mm of particle diameter；Stone level is with distribution：16mm standard screens screen over-size is 15%,
9.5mm standard screens screen over-size is that 55%, 4.75mm standard screens screen over-size is 30%.
The preparation method of the concrete of the present embodiment is：Cement, middle sand, stone, water, the efficient diminishing that will be weighed by proportioning
Agent is put into the uniform aftershaping concrete of stirrer for mixing；It is quiet under 20 DEG C of environment after concrete formation to stop 4h；Then by coagulation
Soil is placed in steam curing box, and in being at the uniform velocity warming up to 90~98 DEG C in 2.5h, 5h is incubated at 90~98 DEG C；Then natural cooling
The demoulding is produced.
Embodiment 3
One kind exempts from pressure and steams PHC pile tube concrete, and the raw material of following weight is contained in the concrete per m3：Portland cement
475kg, naphthalene series high-efficiency water-reducing agent 9kg, middle sand 670kg, stone 1130kg, water 133kg.
Portland cement is included in the present embodiment：Portland clinker 88.9%, phosphorus slag 8%, silicon ash 3%, sodium gluconate
0.1%；The specific surface area of the phosphorus slag is 450 m2/kg。
The specific surface area 380m of the portland cement of the present embodiment2/ kg, 80 μm of square hole screens tail over 2%；Presetting period
18min, final setting time 47min；3d rupture strength 5.8MPa, compression strength 33.5MPa, 28d rupture strength 6.6MPa, pressure resistance
Spend 50MPa.
In the present embodiment, the clay content of middle sand is 0.3%, and fineness modulus is 3.0, and level is with distribution：4.75mm standard screen is tailed over
Account for 6%, 2.36mm standard screens and tail over to account for 20%, 1.18mm standard screens and tail over to account for 17%, 0.6mm standard screens and tail over and account for 20%, 0.315mm
Standard screen, which tails over to account for 18%, 0.15mm standard screens and tail over, accounts for 19%.
In the present embodiment, stone is rubble, 5~20mm of particle diameter；Stone level is with distribution：16mm standard screens screen over-size is 15%,
9.5mm standard screens screen over-size is that 55%, 4.75mm standard screens screen over-size is 30%.
The preparation method of the concrete of the present embodiment is：Cement, middle sand, stone, water, the efficient diminishing that will be weighed by proportioning
Agent be put into stirrer for mixing it is uniform after enter mold forming concrete；It is quiet under 25 DEG C of environment after concrete formation to stop 2.5h；Then
Concrete is placed in steam curing box, 90~98 DEG C are at the uniform velocity warming up to by initial temperature in 3h；6h is incubated at 90~98 DEG C；
The natural cooling demoulding is produced.
Embodiment 4
One kind exempts from pressure and steams PHC pile tube concrete, and the raw material of following weight is contained in the concrete per m3：Portland cement
440kg, naphthalene series high-efficiency water-reducing agent 8.36kg, middle sand 700kg, stone 1200kg, water 123.2kg.
The portland cement of the present embodiment is included：Portland clinker 82%, phosphorus slag 16%, silicon ash 2%, the phosphorus slag
Specific surface area is 400 m2/kg；The specific surface area 400m of the portland cement2/ kg, 80 μm of square hole screens tail over 1.8%；When pre-hardening
Between 25min, final setting time 44min；3d rupture strength 5.0MPa, compression strength 28.2MPa, 28d rupture strength 6.0MPa, resistance to compression
Intensity 48.3MPa.
In the present embodiment, the clay content of sand is 0.3% in washing, and fineness modulus is 2.8, and level is with distribution：4.75mm standard screen
Tail over 0%, 2.36mm standard screens and tail over to account for 17%, 1.18mm standard screens and tail over to account for 17%, 0.6mm standard screens and tail over and account for 21%,
0.315mm standard screens, which tail over to account for 18%, 0.15mm standard screens and tail over, accounts for 27%.
In the present embodiment, stone is rubble, 5~20mm of particle diameter；Stone size distribution：16mm standard screens screen over-size is 30%,
9.5mm standard screens screen over-size is that 20%, 4.75mm standard screens screen over-size is 50%.
The preparation method of the concrete of the present embodiment is：Cement, middle sand, stone, water, the efficient diminishing that will be weighed by proportioning
Agent be put into stirrer for mixing it is uniform after enter quiet under 20 DEG C of environment after mold forming, concrete formation to stop 2h；Then by concrete
It is placed in steam curing box, 90~98 DEG C is at the uniform velocity warming up to by initial temperature in 2h；5.5h is incubated at 90~98 DEG C, then certainly
Right cooling and demolding is produced.
Embodiment 5
One kind exempts from pressure and steams PHC pile tube concrete, and the raw material of following weight is contained in the concrete per m3：Portland cement
460kg, naphthalene series high-efficiency water-reducing agent 128.8kg, middle sand 680kg, stone 1130kg, water 128.8kg.
The portland cement of the present embodiment is included：Portland clinker 92.85%, phosphorus slag 5%, silicon ash 3%, gluconic acid
Sodium 0.15%, the specific surface area of the phosphorus slag is 450m2/kg；The specific surface area 400m of the portland cement2/ kg, 80 μm of square holes
Tail over 2.1%；Presetting period 20min, final setting time 45min；The anti-folding of 3d rupture strength 6.2MPa, compression strength 32MPa, 28d
Intensity 7.6MPa, compression strength 53.6MPa.
In the present embodiment, the clay content of sand is 0.3% in washing, and fineness modulus is 3.0, and level is with distribution：4.75mm standard screen
Tail over 7%, 2.36mm standard screens and tail over to account for 16%, 1.18mm standard screens and tail over to account for 20%, 0.6mm standard screens and tail over and account for 21%,
0.315mm standard screens, which tail over to account for 18%, 0.15mm standard screens and tail over, accounts for 18%.
In the present embodiment, stone is rubble, 5~20mm of particle diameter.Stone size distribution：16mm standard screens screen over-size is 20%,
9.5mm standard screens screen over-size is that 35%, 4.75mm standard screens screen over-size is 45%.
The preparation method of the concrete of the present embodiment is：Cement, middle sand, stone, water, the efficient diminishing that will be weighed by proportioning
Agent be put into stirrer for mixing it is uniform after enter mold forming；It is quiet under 30 DEG C of environment after concrete formation to stop 3.5h；Then by coagulation
Soil is placed in steam curing box, and 90~98 DEG C DEG C are at the uniform velocity warming up to by initial temperature in 2h；6h is incubated at 90~98 DEG C；It is natural
Cooling and demolding.
Embodiment 6
One kind exempts from pressure and steams PHC pile tube concrete, and the raw material of following weight is contained in the concrete per m3：Portland cement
480kg, naphthalene series high-efficiency water-reducing agent 8.74kg, middle sand 670kg, stone 1180kg, water 134.4kg.
Portland cement in the present embodiment includes 84.9% Portland clinker, 13% phosphorus slag, 2% silicon ash, 0.1%
Sodium gluconate；The specific surface area of the phosphorus slag is 420 m2/kg；The specific surface area 370m of the portland cement2/ kg, 80 μm
Square hole screen tails over 2.1%；Presetting period 20min, final setting time 43min；3d rupture strength 5.2MPa, compression strength 30MPa, 28d
Rupture strength 6.3MPa, compression strength 50.6MPa.
In the present embodiment, the clay content of sand is 0.4% in washing, and fineness modulus is 2.8, and level is with distribution：4.75mm standard screen
Tail over 1%, 2.36mm standard screens and tail over to account for 24%, 1.18mm standard screens and tail over to account for 17%, 0.6mm standard screens and tail over and account for 20%,
0.315mm standard screens, which tail over to account for 15%, 0.15mm standard screens and tail over, accounts for 23%.
In the present embodiment, stone is rubble, particle diameter 5mm~20mm, stone size distribution：16mm standard screen screen over-sizes are
18%, 9.5mm standard screen screen over-size are that 40%, 4.75mm standard screens screen over-size is 42%.
The preparation method of the concrete of the present embodiment is：Cement, middle sand, stone, water, the efficient diminishing that will be weighed by proportioning
Agent be put into stirrer for mixing it is uniform after enter mold forming；It is quiet under 30 DEG C of environment after shaping to stop 2h；Then concrete is placed in steaming
In vapour curing box, then, 6h is incubated at 95~98 DEG C to 90~98 DEG C by initial temperature constant heatingrate in 2.5h, then certainly
Right cooling and demolding is produced.
Above-described embodiment 1~6 and common PHC concrete samples are according to GB/T 50107-2010《Test of concrete strength is commented
Calibration is accurate》Intensity is tested, according to GB/T50082-2009《Standard for test methods of longterm performance and durability of ordinary concrete standard》
Intensity and shrinkage factor are tested, correction data is as shown in table 1 below.
Table 1:
It was found from the data of table 1：The concrete steam-cured rear 28d intensity of the present invention has increased, and test specimen shrinkage value is small, no fine fisssure
Line occurs, and such as the concrete of embodiment 5 is conserved after 6h at 95 DEG C, concrete surface such as Fig. 1 of standard curing to 28 day age
Shown, common pile tube PHC concrete is conserved after 6h at 95 DEG C, concrete surface such as Fig. 2 institutes of standard curing to 28 day age
Show.After common PHC is concrete steam-cured, standard curing is carried out, AFm is changed into AFt, and fine fisssure occurs in volumetric expansion, strength retraction
Line.Therefore, the present invention can be prevented effectively from the retraction of steam-curing concrete later strength and the appearance of micro-crack, improve and exempt from pressure steaming pipe
The volume stability of pile concrete, so as to improve its durability.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
According to the present invention technical spirit above example is made any simple modification, equivalent variations, each fall within the present invention protection
Within the scope of.
Claims (4)
1. one kind, which exempts from pressure, steams PHC pile tube concrete, it is characterised in that：Including the following raw material configured by weight：Silicate cement
425~500kg/m of mud3, middle 670~700kg/m of sand3, 1130~1200kg/m of stone3, 119~140kg/m of water consumption3, naphthalene system
8~9.5kg/m of high efficiency water reducing agent3；The portland cement includes the following raw material constituted by mass percentage：Portland cement
Clinker 76.85~93%, phosphorus slag 5~18%, silicon ash 2~5%, sodium gluconate 0~0.15%；The specific surface area of the phosphorus slag is
400~450m2/kg；
The portland cement meets following technical indicator：350~420m of specific surface area2/ kg, 80 μm of square hole screens are tailed over and are no more than
10%；Presetting period must not must not be later than 240min earlier than 15min, final setting time；3d rupture strengths are more than 3.5MPa, pressure resistance
Degree is more than 20MPa, and 28d rupture strengths are more than 5MPa, and compression strength is more than 45MPa.
2. one kind as claimed in claim 1, which exempts from pressure, steams PHC pile tube concrete, it is characterised in that：The clay content of the middle sand
No more than 0.8%, modulus of fineness is 2.8~3.0, and sand level matches somebody with somebody distribution：4.75mm standard screens, which are tailed over, accounts for 0~7%, 2.36mm
Standard screen, which tails over to account for 16~24%, 1.18mm standard screens and tail over to account for 17~20%, 0.6mm standard screens and tail over, accounts for 18~21%,
0.315mm standard screens, which tail over to account for 15~18%, 0.15mm standard screens and tail over, accounts for 14~27%.
3. one kind as claimed in claim 2, which exempts from pressure, steams PHC pile tube concrete, it is characterised in that：Described stone is rubble,
5~20mm of particle diameter；Stone level is with distribution：16mm standard screens screen over-size be 15~30%, 9.5mm standard screens screen over-size be 20~
55%, 4.75mm standard screen screen over-size are 30~50%.
4. a kind of preparation method for exempting from pressure steaming PHC pile tube concrete as described in any one of claims 1 to 3, its feature exists
In：Comprise the following steps：
1）By by the proportioning cement, middle sand, stone, water, the high efficiency water reducing agent that weigh be put into stirrer for mixing it is uniform after enter mould into
Type；
2）It is quiet to stop
It is quiet under 20~30 DEG C of environment to stop 2~4h after concrete formation；
3）By step 2）It is quiet stop after concrete be placed in steam curing box, 90~98 DEG C are at the uniform velocity warming up in 2~3h, then
90~98 DEG C of 4~6h of insulation；
4）The natural cooling demoulding is produced.
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| CN201510893520.4A CN105384409B (en) | 2015-12-08 | 2015-12-08 | One kind exempts from pressure and steams PHC pile tube concrete |
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| CN201510893520.4A CN105384409B (en) | 2015-12-08 | 2015-12-08 | One kind exempts from pressure and steams PHC pile tube concrete |
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| CN105384409A CN105384409A (en) | 2016-03-09 |
| CN105384409B true CN105384409B (en) | 2017-10-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948288A (en) * | 2010-09-30 | 2011-01-19 | 中交第三航务工程局有限公司 | Early-strength concrete for non-steam autoclaved PHC pipe piles |
| CN104742249A (en) * | 2013-12-26 | 2015-07-01 | 天津市泽元混凝土有限公司 | Production method of concrete pipe pile |
| CN104944813A (en) * | 2015-07-01 | 2015-09-30 | 嘉华特种水泥股份有限公司 | Particulate Portland cement clinker and preparation method thereof |
| CN104960086A (en) * | 2015-06-10 | 2015-10-07 | 江苏东浦管桩有限公司 | Production method of non-surplus-slurry and non-autoclaved prestressed concrete pipe pile |
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| JPH11278908A (en) * | 1998-03-31 | 1999-10-12 | Sumitomo Osaka Cement Co Ltd | Cement for high strength and high fluidity concrete and high strength and high fluidity concrete |
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| CN101948288A (en) * | 2010-09-30 | 2011-01-19 | 中交第三航务工程局有限公司 | Early-strength concrete for non-steam autoclaved PHC pipe piles |
| CN104742249A (en) * | 2013-12-26 | 2015-07-01 | 天津市泽元混凝土有限公司 | Production method of concrete pipe pile |
| CN104960086A (en) * | 2015-06-10 | 2015-10-07 | 江苏东浦管桩有限公司 | Production method of non-surplus-slurry and non-autoclaved prestressed concrete pipe pile |
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