CN105384409A - Concrete for pressure steam free PHC piles - Google Patents
Concrete for pressure steam free PHC piles Download PDFInfo
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- CN105384409A CN105384409A CN201510893520.4A CN201510893520A CN105384409A CN 105384409 A CN105384409 A CN 105384409A CN 201510893520 A CN201510893520 A CN 201510893520A CN 105384409 A CN105384409 A CN 105384409A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a concrete for pressure steam free PHC piles and belongs to the technical field of cement. The concrete comprises the following raw materials: silicate cement (425 to 500 kg/m3), medium sand (670 to 700 kg/m3), stone (1130 to 1200 kg/m3), water (119 to 140 kg/m3), and naphthalene high efficient water reducer (8 to 9.5 kg/m3); wherein the silicate cement comprises the following raw materials in percentage by weight: 76.85 to 93% of silicate cement clinker, 5 to 18% of phosphor slag, 2 to 5% of silica fume, and 0 to 0.15% of sodium gluconate. In the prior art, during the maintenance process of pressure steam free PHC concrete, DEF reaction happens, the concrete volume stability and durability are influenced by the DEF reaction, the provided concrete solves the problems mentioned above, thus the pile volume stability and durability are both improved, and the construction period is shortened.
Description
Technical field
The present invention relates to a kind of concrete pile, particularly relate to one and exempt from pressure steaming PHC pile tube concrete.
Background technology
At present, high-strength concrete tubular pile, after centrifugal forming, first adopts atmospheric steam curing, experience quietly to stop, heat up, constant temperature, cooling four-stage, temperature is at 60 DEG C ~ 70 DEG C, and the time is 4 ~ 7 hours.Then the demoulding, then carry out autoclave curing.Autoclave curing adopts pressure to steam still, and during maintenance, vapor pressure reaches 0.9MPa ~ 1.0MPa, and temperature, at about 180 DEG C, is lasted for 7 ~ 10 hours.Concrete is in vapor cure process, and due to quick rising and the reduction of temperature, tubular pile concrete internal-external temperature difference is excessive, and tubular pile body easily produces crack, even ftractures, and causes concrete tubular pile intensity to reduce, and makes pile tube quality product degradation.In addition, autoclave curing energy consumption is high, have a large amount of heat energy and drained, cause energy dissipation, and fire coal can produce a large amount of flue gases, need process flue gas in maintenance processes, has increased the weight of the environmental burden of enterprise.Further, pressure steams still equipment investment greatly, complex process, particularly safety hazards is many, so save pressure steaming link to have huge Social benefit and economic benefit.
Phosphorus slag is that the hot method of Rock Phosphate (72Min BPL) produces the industrial residue discharged in yellow phosphorus process, often produces 1t yellow phosphorus, approximately produces 8 ~ 10t phosphorus slag.In recent years, along with developing rapidly of China's phosphorus production industry, the quantity discharged of phosphorus slag also increases thereupon, every year all at 5,000,000 more than t, and cumulative year after year.A large amount of phosphorus slags is piled up, and not only take a large amount of soils, and the objectionable impurities in phosphorus slag can permeate the ground with rainwater, causes the pollution of underground water.Meanwhile, also result in the waste of a large amount of residue resource; Therefore, the utilization ratio strengthening phosphorus slag resource is very urgent.
It is CN103030342B that State Intellectual Property Office discloses an Authorization Notice No. on April 10th, 2013, the patent of invention that name is called " one is exempted to press and steamed prestressed high-strength centrifugal pile tube and preparation method thereof ", disclosed in this patent, preparation method is as follows: A, by 445kg/m
3cement, 70kg/m
3microballon, 35kg/m
3silicon ash, 720kg/m
3sand, 1191kg/m
3rubble, 1.9kg/m
3water reducer, 104.5kg/m
3water, wherein water-cement ratio 0.19 is mixed and made into concrete; B, adopt above-mentioned concrete in punching block after cloth, matched moulds stretch-draw, on whizzer, centrifugal forming makes prestressed concrete pipe pile, point low speed, middling speed, high speed, high speed four-stage in described centrifugal molding process; Prestressed concrete pipe pile after C, centrifugal forming carries out an atmospheric steam curing or water is supported, and controls thermostat temperature at 75 DEG C ~ 95 DEG C; Then naturally park, 7 days, concrete strength 118.0MPa.The pile tube that this patent system obtains needs nature to park 7 days after 75 DEG C ~ 95 DEG C maintenances, and curing time is longer, causes the production cycle long, inefficiency.
And for example publication number CN104960086A, the patent of invention that name is called " a kind of exempting from presses the production method of steaming concrete pile ", the method mainly excites flyash activity by exciting agent, increase concrete strength, but exciting agent joins in pearlstone obtained by glycol ether, trolamine and dispersing agent NNO, and preparation method is complicated and uneconomical; And the patent of publication number CN104742249A reaches by interpolation solid glass micro-bead and 95 grades of phosphorus slags the object exempting to press steaming, but cost is high, shrinks large.
Often comprise a certain amount of gypsum in non-evaporating pressure concrete of the prior art, to play the effect of slow setting, but have gypsum to deposit in case, the C in cement
3a hydrated product is AFt(calcium trisulphoaluminate hydrate) and the mono-sulfur type hydrated calcium aluminate sulfate of AFm(), steam-cured for normal pressure, gypsum existence can cause the generation of delayed ettringite, be called DEF phenomenon, and DEF is considered to a kind of potential destructive reaction affecting concrete durability, DEF reaction in concrete refers to that vapor cure terminates the rear normal warm and humid maintenance stage, and low steady low sulfur type calcium sulphoaluminate (AFm) causes to ettringite (AFt) transformation.Correlative study draws, the best effectively avoiding DEF to react allows curing temperature to be 65 ~ 70 DEG C, but improves concrete intensity within a short period of time, the reduction of erection time, and this curing temperature is too low, is unfavorable for industrialized production.
Summary of the invention
The present invention is in order to solve in prior art, because the existence of gypsum causes delayed ettringite to react in tubular pile concrete, affect the problem of concrete durability, propose one and exempt from pressure steaming PHC pile tube concrete, by select special cement grog and other raw materials with the use of, realizing when there is no gypsum, also can reach the service requirements of tubular pile concrete, there is the volume stability and the advantage of weather resistance and reduction of erection time that improve pile tube.
In order to realize foregoing invention object, technical scheme of the present invention is as follows:
One is exempted from pressure and is steamed PHC pile tube concrete, it is characterized in that: comprise the following raw material configured by weight: silicate cement 425 ~ 500kg/m
3, medium sand 670 ~ 700kg/m
3, stone 1130 ~ 1200kg/m
3, water consumption 119 ~ 140kg/m
3, naphthalene series high-efficiency water-reducing agent 8 ~ 9.5kg/m
3; Described silicate cement comprises the following raw material formed by mass percentage: Portland clinker 76.85 ~ 93%, phosphorus slag 5 ~ 18%, silicon ash 2 ~ 5%, Sunmorl N 60S 0 ~ 0.15%; The specific surface area of described phosphorus slag is 400 ~ 450m
2/ kg.
Portland clinker of the present invention is 201510378815.8 by application number, and the patent that name is called " a kind of small-particle Portland clinker and preparation method thereof " prepares.
Described silicate cement meets following technical indicator: specific surface area 350 ~ 420m
2/ kg, 80 μm of square hole sieves tail over and are no more than 10%; Presetting period must not early than 15min, and final setting time must not be later than 240min; 3d folding strength is greater than 3.5MPa, and ultimate compression strength is greater than 20MPa, and 28d folding strength is greater than 5MPa, and ultimate compression strength is greater than 45MPa.
The silt content of described medium sand is no more than 0.8%, fineness modulus is 2.8 ~ 3.0, sand grating distribution range: 4.75mm standard sieve tails over and accounts for 0 ~ 7%, 2.36mm standard sieve tails over and accounts for 16 ~ 24%, 1.18mm standard sieve tails over and accounts for 17 ~ 20%, 0.6mm standard sieve tails over and accounts for 18 ~ 21%, 0.315mm standard sieve and tail over and account for 15 ~ 18%, 0.15mm standard sieve and tail over and account for 14 ~ 27%.
Described stone is rubble, particle diameter 5 ~ 20mm; Stone grating distributes: 16mm standard sieve screen over-size is 15 ~ 30%, 9.5mm standard sieve screen over-size be 20 ~ 55%, 4.75mm standard sieve screen over-size is 30 ~ 50%.
Pressure of exempting from of the present invention steams the concrete preparation method of PHC pile tube, it is characterized in that: comprise the following steps:
1) cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into the even aftershaping of stirrer for mixing;
2) quietly to stop
After concrete formation, quietly under 20 ~ 30 DEG C of environment stop 2 ~ 4h;
3) by step 2) quiet stop after concrete be placed in steam curing box, in 2 ~ 3h, be at the uniform velocity warming up to 90 ~ 98 DEG C, subsequently 90 ~ 98 DEG C insulation 4 ~ 6h;
4) the naturally cooling demoulding and get final product.
Beneficial effect of the present invention:
(1) the present invention adopts not gypseous silicate cement to make gelling material, and the time of coagulation of cement is regulated by Sunmorl N 60S and phosphorus slag compound, with the silicate cement of routine of the prior art, as the Portland clinker based on Calucium Silicate powder and less than 5% Wingdale or granulated blast-furnace slag, the hydraulic cementing materials that proper amount of gypsum is levigate to be made is compared, present invention, avoiding the introducing of sulfate ion, thus solve pressure of exempting from of the prior art and steam concrete tubular pile at 80 ~ 100 DEG C during maintenance, there is DEF phenomenon, affect the problem of pile tube weather resistance; And add a small amount of silicon ash as packing material, there is cost low, advantage with short production cycle.
Steam compared with concrete with of the prior art pressure, the present invention saves the process of High Temperature High Pressure maintenance, save energy consumption, and in actual production, every mitron stake can save about 21.6 yuan, thus can improve the economic benefit of cement production enterprise; The present invention steams tubular pile concrete relative to the pressure of exempting from of maintenance at 65 ~ 75 DEG C, and while ensuring the quality of products, its preparation efficiency is higher, thus realizes the object of reduction of erection time.
Through retrieval, there are no completely not gypseous concrete record, as long as there is gypsum to exist in tubular pile concrete, if maintenance at relatively high temperatures, the problem of the durable difference of pile tube volume will certainly be caused, and the application solves this problem well.
(2) the present invention is by the further selection to medium sand and stone, and the proportioning of sand, stone is good, and sand coarse aggregate ratio is moderate, makes concrete of the present invention more tight when centrifugal forming, balances the problem of concrete mobility and stability.
Accompanying drawing explanation
Fig. 1 be the concrete of the embodiment of the present invention 5 at 95 DEG C after maintenance 5h, the concrete surface in normal curing to 28 day length of time;
Fig. 2 be common pile tube PHC concrete at 95 DEG C after maintenance 5h, the concrete surface in normal curing to 28 day length of time.
Embodiment
Embodiment 1
One is exempted from pressure and is steamed PHC pile tube concrete, containing the raw material of following weight in the concrete of every m3: silicate cement 500kg, naphthalene series high-efficiency water-reducing agent 9.5kg, medium sand 670kg, stone 1200kg, water 140kg.
The present embodiment mesosilicic acid salt cement comprises following raw material by mass percentage: Portland clinker 93%, phosphorus slag 5%, silicon ash 2.3%, Sunmorl N 60S 0.15%; Described silicate cement specific surface area 360m
2/ kg, 80 μm of square hole sieves tail over 1%; Presetting period 20min, final setting time 40min; 3d folding strength 5.8MPa, ultimate compression strength 32.5MPa, 28d folding strength 7.8MPa, ultimate compression strength 52.5MPa.
In the present embodiment, the silt content of medium sand is 0.3%, fineness modulus is 3.0, grating distributes: 4.75mm standard sieve tails over and accounts for 6%, 2.36mm standard sieve tails over and accounts for 20%, 1.18mm standard sieve and tail over and account for 17%, 0.6mm standard sieve and tail over and account for 20%, 0.315mm standard sieve tails over and accounts for 18%, 0.15mm standard sieve and tail over and account for 19%.
In the present embodiment, stone is rubble, particle diameter 5 ~ 20mm, and stone realizes tight distribution, and grating distributes: 16mm standard sieve screen over-size is 15%, 9.5mm standard sieve screen over-size be 55%, 4.75mm standard sieve screen over-size is 30%.
The concrete preparation method of the present embodiment is: the cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into the even formation of concrete of stirrer for mixing, quietly under 30 DEG C of environment after concrete formation stops 2h; Then be placed in steam curing box, in 2h, be at the uniform velocity warming up to 90 ~ 98 DEG C; 5.5h is incubated, the then demoulding and get final product after naturally cooling at 90 ~ 98 DEG C.
Embodiment 2
One is exempted from pressure and is steamed PHC pile tube concrete, containing the raw material of following weight in the concrete of every m3: silicate cement 425kg, naphthalene series high-efficiency water-reducing agent 8kg, medium sand 700kg, stone 1170kg, water 119kg.
The silicate cement of the present embodiment comprises following raw material by mass percentage: Portland clinker 77%, phosphorus slag 18%, silicon ash 5%, Sunmorl N 60S 0%; The specific surface area of the phosphorus slag of the present embodiment is 400m
2/ kg.
The specific surface area 380m of the silicate cement of the present embodiment
2/ kg, 80 μm of square hole sieves tail over 0.5%; Presetting period 18min, final setting time 37min; 3d folding strength 4.8MPa, ultimate compression strength 25.5MPa, 28d folding strength 5.7MPa, ultimate compression strength 45.5MPa.
In the present embodiment, the silt content of medium sand is 0.3%, fineness modulus is 3.0, sand grating distribution range: 4.75mm standard sieve tails over and accounts for 6%, 2.36mm standard sieve tails over and accounts for 20%, 1.18mm standard sieve and tail over and account for 17%, 0.6mm standard sieve and tail over and account for 20%, 0.315mm standard sieve tails over and accounts for 18%, 0.15mm standard sieve and tail over and account for 19%.
In the present embodiment, stone is rubble, particle diameter 5 ~ 20mm; Stone grating distributes: 16mm standard sieve screen over-size is 15%, 9.5mm standard sieve screen over-size be 55%, 4.75mm standard sieve screen over-size is 30%.
The concrete preparation method of the present embodiment is: the cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into the even aftershaping concrete of stirrer for mixing; Quietly under 20 DEG C of environment after concrete formation stop 4h; Then concrete is placed in steam curing box, in 2.5h, is at the uniform velocity warming up to 90 ~ 98 DEG C, at 90 ~ 98 DEG C, be incubated 5h; Then the naturally cooling demoulding and get final product.
Embodiment 3
One is exempted from pressure and is steamed PHC pile tube concrete, containing the raw material of following weight in the concrete of every m3: silicate cement 475kg, naphthalene series high-efficiency water-reducing agent 9kg, medium sand 670kg, stone 1130kg, water 133kg.
The present embodiment mesosilicic acid salt cement comprises: Portland clinker 88.9%, phosphorus slag 8%, silicon ash 3%, Sunmorl N 60S 0.1%; The specific surface area of described phosphorus slag is 450m
2/ kg.
The specific surface area 380m of the silicate cement of the present embodiment
2/ kg, 80 μm of square hole sieves tail over 2%; Presetting period 18min, final setting time 47min; 3d folding strength 5.8MPa, ultimate compression strength 33.5MPa, 28d folding strength 6.6MPa, ultimate compression strength 50MPa.
In the present embodiment, the silt content of medium sand is 0.3%, fineness modulus is 3.0, grating distributes: 4.75mm standard sieve tails over and accounts for 6%, 2.36mm standard sieve tails over and accounts for 20%, 1.18mm standard sieve and tail over and account for 17%, 0.6mm standard sieve and tail over and account for 20%, 0.315mm standard sieve tails over and accounts for 18%, 0.15mm standard sieve and tail over and account for 19%.
In the present embodiment, stone is rubble, particle diameter 5 ~ 20mm; Stone grating distributes: 16mm standard sieve screen over-size is 15%, 9.5mm standard sieve screen over-size be 55%, 4.75mm standard sieve screen over-size is 30%.
The concrete preparation method of the present embodiment is: the cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into stirrer for mixing evenly after enter mold forming concrete; Quietly under 25 DEG C of environment after concrete formation stop 2.5h; Then concrete is placed in steam curing box, in 3h, is at the uniform velocity warming up to 90 ~ 98 DEG C by initial temperature; 6h is incubated at 90 ~ 98 DEG C; The naturally cooling demoulding and get final product.
Embodiment 4
One is exempted from pressure and is steamed PHC pile tube concrete, containing the raw material of following weight in the concrete of every m3: silicate cement 440kg, naphthalene series high-efficiency water-reducing agent 8.36kg, medium sand 700kg, stone 1200kg, water 123.2kg.
The silicate cement of the present embodiment comprises: Portland clinker 82%, phosphorus slag 16%, silicon ash 2%, and the specific surface area of described phosphorus slag is 400m
2/ kg; The specific surface area 400m of described silicate cement
2/ kg, 80 μm of square hole sieves tail over 1.8%; Presetting period 25min, final setting time 44min; 3d folding strength 5.0MPa, ultimate compression strength 28.2MPa, 28d folding strength 6.0MPa, ultimate compression strength 48.3MPa.
In the present embodiment, the silt content of washing medium sand is 0.3%, fineness modulus is 2.8, grating distributes: 4.75mm standard sieve tails over 0%, 2.36mm standard sieve tails over and accounts for 17%, 1.18mm standard sieve and tail over and account for 17%, 0.6mm standard sieve and tail over and account for 21%, 0.315mm standard sieve tails over and accounts for 18%, 0.15mm standard sieve and tail over and account for 27%.
In the present embodiment, stone is rubble, particle diameter 5 ~ 20mm; Stone size-grade distribution: 16mm standard sieve screen over-size is 30%, 9.5mm standard sieve screen over-size be 20%, 4.75mm standard sieve screen over-size is 50%.
The concrete preparation method of the present embodiment is: the cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into stirrer for mixing evenly after enter mold forming, quietly under 20 DEG C of environment after concrete formation stop 2h; Then concrete is placed in steam curing box, in 2h, is at the uniform velocity warming up to 90 ~ 98 DEG C by initial temperature; 5.5h is incubated, then the naturally cooling demoulding and get final product at 90 ~ 98 DEG C.
Embodiment 5
One is exempted from pressure and is steamed PHC pile tube concrete, containing the raw material of following weight in the concrete of every m3: silicate cement 460kg, naphthalene series high-efficiency water-reducing agent 128.8kg, medium sand 680kg, stone 1130kg, water 128.8kg.
The silicate cement of the present embodiment comprises: Portland clinker 92.85%, phosphorus slag 5%, silicon ash 3%, Sunmorl N 60S 0.15%, and the specific surface area of described phosphorus slag is 450m
2/ kg; The specific surface area 400m of described silicate cement
2/ kg, 80 μm of square hole sieves tail over 2.1%; Presetting period 20min, final setting time 45min; 3d folding strength 6.2MPa, ultimate compression strength 32MPa, 28d folding strength 7.6MPa, ultimate compression strength 53.6MPa.
In the present embodiment, the silt content of washing medium sand is 0.3%, fineness modulus is 3.0, grating distributes: 4.75mm standard sieve tails over 7%, 2.36mm standard sieve tails over and accounts for 16%, 1.18mm standard sieve and tail over and account for 20%, 0.6mm standard sieve and tail over and account for 21%, 0.315mm standard sieve tails over and accounts for 18%, 0.15mm standard sieve and tail over and account for 18%.
In the present embodiment, stone is rubble, particle diameter 5 ~ 20mm.Stone size-grade distribution: 16mm standard sieve screen over-size is 20%, 9.5mm standard sieve screen over-size be 35%, 4.75mm standard sieve screen over-size is 45%.
The concrete preparation method of the present embodiment is: the cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into stirrer for mixing evenly after enter mold forming; Quietly under 30 DEG C of environment after concrete formation stop 3.5h; Then concrete is placed in steam curing box, in 2h, is at the uniform velocity warming up to 90 ~ 98 DEG C DEG C by initial temperature; 6h is incubated at 90 ~ 98 DEG C; The naturally cooling demoulding.
Embodiment 6
One is exempted from pressure and is steamed PHC pile tube concrete, containing the raw material of following weight in the concrete of every m3: silicate cement 480kg, naphthalene series high-efficiency water-reducing agent 8.74kg, medium sand 670kg, stone 1180kg, water 134.4kg.
Silicate cement in the present embodiment comprises the Portland clinker of 84.9%, the phosphorus slag of 13%, 2% silicon ash, 0.1% Sunmorl N 60S; The specific surface area of described phosphorus slag is 420m
2/ kg; The specific surface area 370m of described silicate cement
2/ kg, 80 μm of square hole sieves tail over 2.1%; Presetting period 20min, final setting time 43min; 3d folding strength 5.2MPa, ultimate compression strength 30MPa, 28d folding strength 6.3MPa, ultimate compression strength 50.6MPa.
In the present embodiment, the silt content of washing medium sand is 0.4%, fineness modulus is 2.8, grating distributes: 4.75mm standard sieve tails over 1%, 2.36mm standard sieve tails over and accounts for 24%, 1.18mm standard sieve and tail over and account for 17%, 0.6mm standard sieve and tail over and account for 20%, 0.315mm standard sieve tails over and accounts for 15%, 0.15mm standard sieve and tail over and account for 23%.
In the present embodiment, stone is rubble, particle diameter 5mm ~ 20mm, stone size-grade distribution: 16mm standard sieve screen over-size is 18%, 9.5mm standard sieve screen over-size be 40%, 4.75mm standard sieve screen over-size is 42%.
The concrete preparation method of the present embodiment is: the cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into stirrer for mixing evenly after enter mold forming; Quietly under 30 DEG C of environment after shaping stop 2h; Then concrete is placed in steam curing box, by initial temperature constant heatingrate to 90 ~ 98 DEG C in 2.5h, subsequently, at 95 ~ 98 DEG C, is incubated 6h, then the naturally cooling demoulding and get final product.
Above-described embodiment 1 ~ 6 and common PHC concrete sample test intensity according to GB/T50107-2010 " Standard for inspection and assessment of strength of concrete ", test intensity and shrinking percentage according to GB/T50082-2009 " Standard for test methods of longterm performance and durability of ordinary concrete standard ", correlation data is as shown in table 1 below.
Table 1:
From table 1 data: concrete steam-cured rear 28d intensity of the present invention increases to some extent, test specimen shrinkage value is little, non-microcracked appearance, if the concrete of embodiment 5 is at 95 DEG C after maintenance 6h, the concrete surface in normal curing to 28 day length of time as shown in Figure 1, common pile tube PHC concrete is at 95 DEG C after maintenance 6h, and the concrete surface in normal curing to 28 day length of time as shown in Figure 2.After common PHC is concrete steam-cured, carry out normal curing, AFm changes AFt into, volumetric expansion, and tiny crack appears in strength retraction.Therefore, the present invention effectively can avoid the appearance of the retraction of steam-curing concrete later strength and tiny crack, improves and exempts to press the volume stability steaming tubular pile concrete, thus improve its weather resistance.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (5)
1. exempt from pressure and steam a PHC pile tube concrete, it is characterized in that: comprise the following raw material configured by weight: silicate cement 425 ~ 500kg/m
3, medium sand 670 ~ 700kg/m
3, stone 1130 ~ 1200kg/m
3, water consumption 119 ~ 140kg/m
3, naphthalene series high-efficiency water-reducing agent 8 ~ 9.5kg/m
3; Described silicate cement comprises the following raw material formed by mass percentage: Portland clinker 76.85 ~ 93%, phosphorus slag 5 ~ 18%, silicon ash 2 ~ 5%, Sunmorl N 60S 0 ~ 0.15%; The specific surface area of described phosphorus slag is 400 ~ 450m
2/ kg.
2. one as claimed in claim 1 exempts from pressure steaming PHC pile tube concrete, it is characterized in that: described silicate cement meets following technical indicator: specific surface area 350 ~ 420m
2/ kg, 80 μm of square hole sieves tail over and are no more than 10%; Presetting period must not early than 15min, and final setting time must not be later than 240min; 3d folding strength is greater than 3.5MPa, and ultimate compression strength is greater than 20MPa, and 28d folding strength is greater than 5MPa, and ultimate compression strength is greater than 45MPa.
3. one as claimed in claim 1 exempts from pressure steaming PHC pile tube concrete, it is characterized in that: the silt content of described medium sand is no more than 0.8%, fineness modulus is 2.8 ~ 3.0, sand grating distribution range: 4.75mm standard sieve tails over and accounts for 0 ~ 7%, 2.36mm standard sieve tails over and accounts for 16 ~ 24%, 1.18mm standard sieve and tail over and account for 17 ~ 20%, 0.6mm standard sieve and tail over and account for 18 ~ 21%, 0.315mm standard sieve tails over and accounts for 15 ~ 18%, 0.15mm standard sieve and tail over and account for 14 ~ 27%.
4. one as claimed in claim 3 exempts from pressure steaming PHC pile tube concrete, it is characterized in that: described stone is rubble, particle diameter 5 ~ 20mm; Stone grating distributes: 16mm standard sieve screen over-size is 15 ~ 30%, 9.5mm standard sieve screen over-size be 20 ~ 55%, 4.75mm standard sieve screen over-size is 30 ~ 50%.
5. the one as described in any one of Claims 1 to 4 is exempted from pressure and is steamed the concrete preparation method of PHC pile tube, it is characterized in that: comprise the following steps:
1) cement taken by proportioning, medium sand, stone, water, high efficiency water reducing agent are put into stirrer for mixing evenly after enter mold forming;
2) quietly to stop
After concrete formation, quietly under 20 ~ 30 DEG C of environment stop 2 ~ 4h;
3) by step 2) quiet stop after concrete be placed in steam curing box, in 2 ~ 3h, be at the uniform velocity warming up to 90 ~ 98 DEG C, subsequently 90 ~ 98 DEG C insulation 4 ~ 6h;
4) the naturally cooling demoulding and get final product.
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