CN104291757A - Non-autoclaved PHC (Pre-stressed High-strength Concrete) tubular pile suitable for corrosive environment - Google Patents
Non-autoclaved PHC (Pre-stressed High-strength Concrete) tubular pile suitable for corrosive environment Download PDFInfo
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- CN104291757A CN104291757A CN201410514145.3A CN201410514145A CN104291757A CN 104291757 A CN104291757 A CN 104291757A CN 201410514145 A CN201410514145 A CN 201410514145A CN 104291757 A CN104291757 A CN 104291757A
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- concrete
- gelling material
- pile tube
- water reducer
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- 239000011372 high-strength concrete Substances 0.000 title description 2
- 239000004567 concrete Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 8
- 238000009792 diffusion process Methods 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000001704 evaporation Methods 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000007858 starting material Substances 0.000 claims description 8
- 239000003469 silicate cement Substances 0.000 claims description 7
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002956 ash Substances 0.000 claims description 4
- 229910021487 silica fume Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 3
- 239000004576 sand Substances 0.000 abstract description 3
- 239000011398 Portland cement Substances 0.000 abstract description 2
- 229920005646 polycarboxylate Polymers 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000314 lubricant Substances 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000004566 building material Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010025 steaming Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910021653 sulphate ion Inorganic materials 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 150000001804 chlorine Chemical class 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
本发明公开了一种适用于腐蚀环境下的免蒸压PHC管桩，所述混凝土的原材料包括减水剂、胶凝材料、水和砂石；减水剂为聚羧酸系减水剂，所述胶凝材料为硅酸盐水泥和掺合料，所述胶凝材料的用量为440-520kg/m3，所述掺合料用量为胶凝材料总质量的32%~48%；水胶比为0.18~0.23。管桩带模养护时间为8-9h。管桩混凝土1d抗压强度超过80MPa，5d抗压强度超过90MPa，28d电量值低于150C，氯离子扩散系数低于1.0×10-12m2/s，抗硫酸盐等级达到KS150要求，抗冻等级达到F400要求，具有裂缝自愈合能力。本发明的免蒸压PHC管桩耐久性好，且具有裂缝自愈合能力，适用于腐蚀环境。The invention discloses a non-autoclaved PHC pipe pile suitable for corrosive environments. The raw materials of the concrete include a water reducer, a cementitious material, water and sand; the water reducer is a polycarboxylate water reducer. The cementitious material is Portland cement and admixture, the dosage of the cementitious material is 440-520kg/m 3 , and the dosage of the admixture is 32%~48% of the total mass of the cementitious material; The rubber ratio is 0.18~0.23. The curing time of pipe pile with mold is 8-9h. The compressive strength of pipe pile concrete exceeds 80MPa in 1 day, the compressive strength exceeds 90MPa in 5 days, the electricity value is lower than 150C in 28 days, the chloride ion diffusion coefficient is lower than 1.0×10 -12 m 2 /s, the sulfate resistance grade meets the requirements of KS150, and the frost resistance The grade meets the requirements of F400, and it has the ability of crack self-healing. The autoclaved PHC pipe pile of the invention has good durability and self-healing ability of cracks, and is suitable for corrosive environments.
Description
Technical field
The invention belongs to building material field, particularly a kind of non-evaporating pressure PHC pile tube be applicable under corrosive environment.
Background technology
PHC pile tube full name prestressed high-strength concrete pile, is the concrete member the most often adopted in building foundation, is widely used in the engineerings such as all kinds of building, traffic, water conservancy.China is pile tube producing country maximum in the world and uses state, and within 2011, national annual production is more than 3.5 hundred million meters.
Current China PHC pile tube mainly adopt normal pressure steam-cured+high-pressure steaming and cultivating two-part production technique produces, and also claims steam pressure PHC pile tube.The pile tube adopting this technique to make 3 days intensity can reach C80, and its morning, strong, high-strength principle was under High Temperature High Pressure making condition, and levigate quartz sand and hydrolysis product of cement react, and produce the tobermorite crystal of high strength.
There is following shortcoming in steam pressure PHC pile tube production technique: (1) consumes energy high: Φ 400 every meter quota of expenditure coal is about 4kg ~ 5kg, with national pile tube annual production in 2011 3.5 hundred million meters of calculating, then annual pile tube production consumption coal is about 1,400,000 tons, due to the CO that burning of coal is discharged
2be about 3,670,000 tons, SO
2be about 1.19 ten thousand tons; (2) need configure autoclave, equipment investment and maintenance cost high; (3) to go out still temperature high for PHC pile tube, if the improper pile body that easily makes of lowering the temperature produces crack, pile tube weather resistance declines; (4) work situation is poor, and physical demands is large, recruitment difficulty.
Cancel the high-pressure steaming and cultivating link that pile tube is produced, only adopt the steam-cured non-evaporating pressure PHC pile tube of normal pressure effectively to solve the problem, obtain more research in recent years.But research in the past adopts naphthalene water reducer more, and naphthalene water reducer production process is polluted large; Also have part research to adopt poly carboxylic acid series water reducer, but the curing in the mold time is usually at 10 hours-16 hours, production efficiency is lower, is difficult to carry out industrialization.
In addition, because tube pile construction process adopts hammering method or static pressure method usually, no matter adopt which kind of method, pile tube all can be caused in various degree to produce tiny crack, thus cause pile tube weather resistance to decline.Therefore explicitly point out in China's standard " Code for design of corrosion prevention of industrial buildings " (GB 50046-2008), in strength sulfuric acid brine corrosion environment, should not adopt pile tube; In strong chlorine salt corrosion environment, pile tube should not be adopted; Under middle sulphate corrosion or middle chlorine salt corrosion environment, anticorrosive measure should be adopted.This makes pile tube be very limited in the application in corrosion area.
But wait corrosive environment area coastal at present, need the engineering applying pile tube very many again, this is just badly in need of the PHC pile tube that exploitation is applicable to corrosive environment.
Summary of the invention
For solving the problem, the object of the present invention is to provide a kind of non-evaporating pressure PHC pile tube be applicable under corrosive environment.
Object of the present invention is achieved through the following technical solutions.
Be applicable to the non-evaporating pressure PHC pile tube under corrosive environment, described pile tube comprises steel and concrete, and described concrete starting material comprise water reducer, gelling material, water and sandstone; Described water reducer is poly carboxylic acid series water reducer, and described gelling material is silicate cement and adulterant, and the consumption of described gelling material in concrete is 440-520kg/m
3, described adulterant consumption is 32% ~ 48% of gelling material total mass; Water-cement ratio is 0.18 ~ 0.23.
In aforesaid method, described adulterant comprises slag micropowder, silicon ash and I level flyash, described slag micropowder volume is 17% ~ 35% of gelling material total mass, the 0%-20% of Silica fume content to be 0% ~ 15%, I level doping quantity of fly ash of gelling material total mass be gelling material total mass.
In aforesaid method, the described pile tube curing in the mold time is 8-9 hour, tubular pile concrete 1d ultimate compression strength more than 80MPa, 5d ultimate compression strength more than 90MPa, 28d charge value lower than 150C, chloride diffusion coefficient is lower than 1.0 × 10
-12m
2/ s, sulfate resistance grade reaches KS150 requirement, and freeze proof grade reaches F400 requirement, and has crack self-healing ability; Described pile tube curing in the mold comprises the quiet section of stopping, intensification section and constant temperature zone, and wherein the time of the quiet section of stopping is not less than 4h; The thermostat temperature of constant temperature zone is 85 DEG C-90 DEG C, and constant temperature time is not less than 2.5h.
Compared with prior art, tool of the present invention has the following advantages:
(1) formula adopting the present invention used, the preparation-obtained product of ratio, has the curing in the mold time short simultaneously, has high resisting chloride ion penetration performance, Sulphate-resistant property and anti-freezing property, and has crack self-healing ability.
(2) non-evaporating pressure PHC pile tube of the present invention, itself there is high resisting chloride ion penetration performance, Sulphate-resistant property and anti-freezing property, and there is crack self-healing ability, effectively can solve after original steam pressure PHC pile tube produces crack and cannot heal, the problem of poor durability under corrosive environment, thus pile tube Application Areas is expanded to corrosive environment.
(3) the present invention adopts polycarboxylate water-reducer, the energy-conserving and environment-protective of water reducer production process; Pile tube produce without the need to adopting high-pressure steaming and cultivating, the curing in the mold time at 8-9 hour, more existing steam pressure PHC pile tube and non-evaporating pressure PHC pile tube technology more energy saving standard; The curing in the mold time is suitable for arranging production, and is easy to industrialization.
Embodiment
Do specifically to describe in detail further to the present invention below in conjunction with specific embodiment, but embodiments of the present invention are not limited thereto, for the processing parameter do not indicated especially, can refer to routine techniques and carry out.
Embodiment 1
In the present embodiment, concrete starting material are: water reducer, gelling material, water and sandstone.Water reducer is that the powerful building materials Science and Technology Ltd. of Jiangmen city produces QL-PC5B type poly carboxylic acid series water reducer, the consumption of water reducer in concrete is 3.6% of gelling material quality, water reducer solid content is 10%, gelling material is silicate cement and adulterant, and the consumption of gelling material in concrete is 440kg/m
3, adopt I type 52.5R silicate cement, adulterant consumption is 32% of gelling material total mass, and described adulterant is slag micropowder and silicon ash, and wherein slag micropowder volume is 17% of gelling material total mass, and Silica fume content is 15% of gelling material total mass; Water-cement ratio is 0.23; Sand in sandstone and the stone consumption in concrete is respectively 693 kg/m
3and 1232kg/m
3.
According to the ratio of above-mentioned concrete raw material, get 1.5 cubic meter of concrete starting material, in 2 cubic metres of forced concrete mixers, stir 3min, obtain tubular pile concrete mixture.
In the present embodiment, the gained pile tube curing in the mold time is 9 hours.Tubular pile concrete 1d ultimate compression strength is 80.5MPa, 5d ultimate compression strength be 92.1MPa, 28d charge value is 105C, and chloride diffusion coefficient is 0.61 × 10
-12m
2/ s, sulfate resistance grade reaches KS150 requirement, and freeze proof grade reaches F400 requirement.
The described pile tube curing in the mold stage comprises the quiet section of stopping, intensification section and constant temperature zone, and wherein the time of the quiet section of stopping is 4h; The thermostat temperature of constant temperature zone is 90 DEG C, and constant temperature time is 4h.
The self-healing capability test of the present embodiment gained pile tube:
Step 1, get the tubular pile concrete cube specimen of 5 groups of cured under same condition, to be measured;
Step 2, get 1 group of step 1 and obtain tubular pile concrete cube specimen a, the upper and lower surface contacted with 300 tons of pressing machinees at tubular pile concrete cube specimen a is coated with lubricant, measure the ultimate compression strength of tubular pile concrete cube specimen a, obtaining test specimen compression strength value a is 83MPa; Separately get the tubular pile concrete cube specimen b that 2 groups of steps 1 obtain, the upper and lower surface contacted with pressing machine at tubular pile concrete cube specimen b is coated with lubricant, is further applied load, and holds lotus 5min by 80% of test specimen compression strength value a, make test specimen inside produce tiny crack, obtain pressure break test specimen; By the lubricant removing on pressure break test specimen, after placing 30min, measure the charge value of 1 group of pressure break test specimen, obtain the initial quantity of electricity value x of pressure break test specimen
0it is 160 coulombs;
Step 3, separately get the tubular pile concrete cube specimen c that 1 group of step 1 obtains, measure the charge value of described tubular pile concrete cube specimen c, obtain the initial quantity of electricity value y of non-pressure break test specimen
0it is 130 coulombs;
Step 4, by after the pressure break test specimen removing lubricant described in 1 group of step 2, obtain removing the pressure break test specimen of lubricant; Separately get the tubular pile concrete cube specimen d that 1 group of step 1 obtains, the pressure break test specimen and tubular pile concrete cube specimen d of removing lubricant are put into water in the lump, soak 3d, measure the pressure break test specimen of removal lubricant and the charge value of tubular pile concrete cube specimen d that soak 3d, obtain the pressure break test specimen charge value x removing lubricant
3be 125 coulombs, and tubular pile concrete cube specimen d charge value y
3it is 115 coulombs;
Step 5, decision method are: if y
0-x
0> y
n-x
n, and x
n-x
0during > 0, then represent that tubular pile concrete has self-healing performance; Otherwise, then represent that tubular pile concrete does not have self-healing performance; Drawn by the data recorded, x
0-y
0=160-130=30, x
3-y
3=125-115=10, and x
0-x
3=160-125=35 > 0, meets x
0-y
0> x
n-y
n, and x
0-x
n> 0, therefore represents that this tubular pile concrete has self-healing performance.
Embodiment 2
In the present embodiment, concrete starting material are: water reducer, gelling material, water and sandstone.Water reducer is that the powerful building materials Science and Technology Ltd. of Jiangmen city produces QL-PC5B type poly carboxylic acid series water reducer, the consumption of water reducer in concrete is 4.0% of gelling material quality, water reducer solid content is 10%, gelling material is silicate cement and adulterant, and the consumption of gelling material in concrete is 520kg/m
3adopt II type 42.5R silicate cement, adulterant consumption is 48% of gelling material total mass, and described adulterant is slag micropowder and I level flyash, wherein slag micropowder volume is 35% of gelling material total mass, and doping quantity of fly ash is 13% of gelling material total mass; Water-cement ratio is 0.18; Sand in sandstone and the stone consumption in concrete is respectively 693 kg/m
3and 1232kg/m
3.
According to the ratio of above-mentioned concrete raw material, get 1.5 cubic meter of concrete starting material, in 2 cubic metres of forced concrete mixers, stir 3min, obtain tubular pile concrete mixture.
In the present embodiment, the pile tube curing in the mold time is 8 hours.Tubular pile concrete 1d ultimate compression strength is 89.5MPa, 5d ultimate compression strength be 100.9MPa, 28d charge value is 80C, and chloride diffusion coefficient is 0.55 × 10
-12m
2/ s, sulfate resistance grade reaches KS150 requirement, and freeze proof grade reaches F400 requirement, and has crack self-healing ability (testing method is with reference to the method in embodiment 1).
The described pile tube curing in the mold stage comprises the quiet section of stopping, intensification section and constant temperature zone, and wherein the time of the quiet section of stopping is 4.5h; The thermostat temperature of constant temperature zone is 85 DEG C, and constant temperature time is 2.5h.
Embodiment 3
In the present embodiment, concrete starting material are: water reducer, gelling material, water and sandstone.Water reducer is that the powerful building materials Science and Technology Ltd. of Jiangmen city produces QL-PC5B type poly carboxylic acid series water reducer, the consumption of water reducer in concrete is 3.8% of gelling material quality, water reducer solid content is 10%, gelling material is silicate cement and adulterant, and the consumption of gelling material in concrete is 470kg/m
3adopt 52.5 ordinary Portland cements, adulterant consumption is 40% of gelling material total mass, described adulterant is slag micropowder, silicon ash and I level flyash, wherein slag micropowder volume is 17% of gelling material total mass, Silica fume content is 3% of gelling material total mass, and doping quantity of fly ash is 20% of gelling material total mass; Water-cement ratio is 0.20; The consumption of sandstone in concrete is respectively 693 kg/m
3and 1232kg/m
3.
According to the ratio of above-mentioned concrete raw material, get 1.5 cubic meter of concrete starting material, in 2 cubic metres of forced concrete mixers, stir 3min, obtain tubular pile concrete mixture.
In the present embodiment, the pile tube curing in the mold time is 8.5 hours.Tubular pile concrete 1d ultimate compression strength is 85.1MPa, 5d ultimate compression strength be 95.4MPa, 28d charge value is 85C, and chloride diffusion coefficient is 0.51 × 10
-12m
2/ s, sulfate resistance grade reaches KS150 requirement, and freeze proof grade reaches F400 requirement, and has crack self-healing ability (testing method is with reference to the method in embodiment 1).
The described pile tube curing in the mold stage comprises the quiet section of stopping, intensification section and constant temperature zone, and wherein the time of the quiet section of stopping is 4.5h; The thermostat temperature of constant temperature zone is 85 DEG C, and constant temperature time is 3h.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from spirit of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. be applicable to the non-evaporating pressure PHC pile tube under corrosive environment, described pile tube comprises steel and concrete, it is characterized in that, described concrete starting material comprise water reducer, gelling material, water and sandstone; Described water reducer is poly carboxylic acid series water reducer, and described gelling material is silicate cement and adulterant, and the consumption of described gelling material in concrete is 440-520kg/m
3, described adulterant consumption is 32% ~ 48% of gelling material total mass; Water-cement ratio is 0.18 ~ 0.23.
2. non-evaporating pressure PHC pile tube according to claim 1, it is characterized in that, described adulterant comprises slag micropowder, silicon ash and I level flyash, described slag micropowder volume is 17% ~ 35% of gelling material total mass, the 0%-20% of Silica fume content to be 0% ~ 15%, I level doping quantity of fly ash of gelling material total mass be gelling material total mass.
3. non-evaporating pressure PHC pile tube according to claim 1, it is characterized in that, the described pile tube curing in the mold time is 8-9 hour, tubular pile concrete 1d ultimate compression strength is more than 80MPa, 5d ultimate compression strength is more than 90MPa, 28d charge value lower than 150C, and chloride diffusion coefficient is lower than 1.0 × 10
-12m
2/ s, sulfate resistance grade reaches KS150 requirement, and freeze proof grade reaches F400 requirement, and has crack self-healing ability; Described pile tube curing in the mold comprises the quiet section of stopping, intensification section and constant temperature zone, and wherein the time of the quiet section of stopping is not less than 4h; The thermostat temperature of constant temperature zone is 85 DEG C-90 DEG C, and constant temperature time is not less than 2.5h.
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|---|---|---|---|
| CN201410514145.3A CN104291757B (en) | 2014-09-29 | 2014-09-29 | A kind of non-evaporating pressure PHC pile tube being applicable under corrosive environment |
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| CN104803643A (en) * | 2015-04-08 | 2015-07-29 | 安徽乾元管业有限公司 | Novel non-autoclaved high-strength concrete tubular pile and curing method thereof |
| CN104827561A (en) * | 2015-04-30 | 2015-08-12 | 华南理工大学 | Method for preparing stream-pressure PHC (Prestressed high-strength concrete) pipe pile without residual slurry |
| CN105130308A (en) * | 2015-08-31 | 2015-12-09 | 河南双建管桩股份有限公司 | Prestress concrete tubular pile free of steaming and pressing |
| CN105818265A (en) * | 2016-04-22 | 2016-08-03 | 东南大学 | Steam-curing-free prestressed high-strength concrete centrifugal pipe pile material and preparing method thereof |
| CN107963823A (en) * | 2016-10-20 | 2018-04-27 | 昆山德固新型建材科技有限公司 | A kind of non-evaporating pressure PHC pile piles admixture and the method using its production PHC pile pile |
| CN111635179A (en) * | 2020-06-22 | 2020-09-08 | 苏州海宏水泥制品有限公司 | High-pressure maintenance-free concrete pipe pile and preparation method thereof |
| CN111635157A (en) * | 2020-06-22 | 2020-09-08 | 苏州海宏水泥制品有限公司 | Concrete admixture, preparation method thereof and concrete added with concrete admixture |
| CN113045233A (en) * | 2021-03-16 | 2021-06-29 | 黑龙江东瑞科技发展有限公司 | Non-autoclaved admixture and preparation method thereof |
| CN114293539A (en) * | 2022-01-08 | 2022-04-08 | 福州大学 | Functional gradient self-healing high-strength concrete pipe pile and preparation method thereof |
| CN114773002A (en) * | 2022-04-27 | 2022-07-22 | 佛山市南海通达混凝土有限公司 | Preparation method of non-autoclaved modified rubber concrete with impact resistance |
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| CN113045233A (en) * | 2021-03-16 | 2021-06-29 | 黑龙江东瑞科技发展有限公司 | Non-autoclaved admixture and preparation method thereof |
| CN114293539A (en) * | 2022-01-08 | 2022-04-08 | 福州大学 | Functional gradient self-healing high-strength concrete pipe pile and preparation method thereof |
| CN114773002A (en) * | 2022-04-27 | 2022-07-22 | 佛山市南海通达混凝土有限公司 | Preparation method of non-autoclaved modified rubber concrete with impact resistance |
| CN114773002B (en) * | 2022-04-27 | 2023-02-24 | 佛山市南海通达混凝土有限公司 | Preparation method of non-autoclaved modified rubber concrete with impact resistance |
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