CN101985393A - Steel fiber/polymer fiber dual-fiber reinforced concrete and preparation method thereof - Google Patents
Steel fiber/polymer fiber dual-fiber reinforced concrete and preparation method thereof Download PDFInfo
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- CN101985393A CN101985393A CN 201010260437 CN201010260437A CN101985393A CN 101985393 A CN101985393 A CN 101985393A CN 201010260437 CN201010260437 CN 201010260437 CN 201010260437 A CN201010260437 A CN 201010260437A CN 101985393 A CN101985393 A CN 101985393A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
Abstract
The invention relates to steel fiber/polymer fiber dual-fiber reinforced concrete and a preparation method thereof, and the preparation method is as follows: pouring cement, sand and stones into a mixing device according to the weight ratio of 1: 1.45-2.20: 1.78-2.73, further putting steel fiber into the mixture according to the steel fiber-concrete volume ratio of 0.6-0.8%: 1, and mixing uniformly; preparing water according to the water-cement weight ratio of 0.30-0.48:1, putting a high-efficient water reducing agent into the mixture according to the high-efficient water reducing agent-cement weight ratio of 0.3-1.2%: 1, putting into the water according to the proportion of 0.6-1.2kg polymer fiber per 1m3 concrete, stirring uniformly and obtaining the mixture; and putting the mixture into a concrete mixing device, stirring uniformly and then obtaining the steel fiber/polymer fiber dual-fiber reinforced concrete. The concrete has excellent quality and can be applied in the fields of rigid bridge deck pavement of concrete bridges and overlaying of old cement and concrete pavements.
Description
Technical field
The present invention relates to that concrete bridge bridge floor rigidity is mated formation and new, old cement concrete pavement cover overlays the concrete of usefulness, be specifically related to steel fiber/polymer fiber geminal fibers and strengthen concrete and preparation method thereof.
Background technology
The function of deck paving is the direct abrasion that the carriageway plate of protection girder integral part is not subjected to vehicle tyre or crawler belt, prevents that girder from suffering the erosion of rainwater, and can play certain distribution effect to the concentrated load of vehicle wheel load.The major objective that designs of mating formation is to control progress of fracture and the crack that string stress, thermal stress and fatigue stress cause is reduced to minimum.Thus, deck paving requires that certain intensity is arranged, and can satisfy cracking resistance, shock resistance, has every requirement such as wear resistance.Consider that each plate bight, parting place easily produces cracking, also requires deck paving to have enough bending strengths and toughness.
Bridge deck pavement material commonly used both at home and abroad now has: asphalt, portland cement concrete, reinforcing mat strengthen concrete, continuous reinforcement concrete, steel fiber reinforced concrete, polymer modification concrete, polymer fiber concrete etc.
Intensity is the main performance index of concrete as the important structure material always, and concrete is high to be strengthened is the striving direction of concrete research and development for many years.But inherent weakness such as concrete tension, bending resistance, shock resistance, antiknock and poor toughness are but still limiting giving full play to of its advantage, and along with the improving constantly of concrete strength, this weakness is also more outstanding.It has been generally acknowledged that concrete strength is high more, its toughness is poor more, and fragility is high more, and structure ductility and crack resistance are not enough more, and the hidden danger of bringing to structural seismic performance is big more, and fire resistance is poor more, and the concrete durability problem is big more.Therefore, many for a long time scholars constantly explore method and the approach that improves the above-mentioned performance of concrete.Fiber reinforced concrete is exactly one of Recent study and most widely used important channel.Fiber reinforced concrete (or being called for short fibrous concrete), be to be base material with grout, mortar and concrete, with metallic substance, inorganic materials or organic fibre is a kind of cement-base composite material that strongthener is formed, it is with short and thin, and the fiber with superperformances such as high-tensile, high limit unit elongation, high alkali resistances is evenly dispersed in a kind of New Building Materials that form in the concrete substrate.
Fiber reinforced concrete mainly contains two classes at present: the one, and the plateau modulus staple fibre strengthens concrete, and it represents fiber is steel fiber.Because steel fiber can block carrying out of matrix distress in concrete, therefore the tension of steel fiber reinforced concrete, bending resistance, slip resistance etc. significantly improve than normal concrete, its shock resistance, antifatigue, split back toughness and weather resistance and also have greatly improved, but steel fiber prevents that to concrete incipient crack contribution is little, the adding of steel fiber makes the bad connection of concrete and decking and occurs easily peeling off, and causes the too early destruction of deck paving; The impermeability of steel fiber reinforced concrete, alkali resistance, weathering resistance and deformation performance etc. are also relatively poor in addition.There is the researcher to develop steel fiber and strengthens the polymer modification concrete, improved the shortcoming of steel fiber reinforced concrete material preferably, obtained good performance, but, be difficult to wide popularization and application owing to involve great expense.The 2nd, low-elasticity-modulus amount staple fibre strengthens concrete, and it represents fiber is polymer fiber.Polymer fiber mainly is generation and the development that has limited the concrete early crack to concrete effect, has strengthened concrete weather resistance.The resistance of polymer fiber is split effect and is mainly reflected in and eliminates or alleviated the generation and the development of initial fissure in the early concrete, passivation the stress concentration at initial fissure tip, the intravital stress field of concrete base is continued more and evenly.The action of crack arrest of polymer fiber is fundamentally to the improvement of concrete self-defect, comprises the concrete toughness of effective increase; Reduce the crack, improve impervious ability; Reduce the crack, delay steel bar corrosion; Reduce the chemical erosion that concrete structure is subjected to; Strengthen the freeze-thaw-ability, reduce concrete structure and wreck; Reduce concrete bleeding, surperficial quality of concrete is improved; Reduce the crack, improve wear resistance and impact resistance or the like.But the adding of polymer fiber improves not contribution to concrete intensity, and mixing polymer fiber in a large number has certain reduction effect to concrete intensity on the contrary.Therefore, the shortcoming of aspects such as the anti-incipient crack of steel fiber reinforced concrete and impermeability can be replenished and improve to these advantages of polymer fiber preferably, and steel fiber can remedy the polymer fiber concrete in the loss aspect the intensity preferably to concrete enhancement.
Summary of the invention
The objective of the invention is to defective, provide steel fiber/polymer fiber geminal fibers to strengthen concrete and preparation method thereof at the prior art existence.The present invention is achieved through the following technical solutions:
Steel fiber/polymer fiber geminal fibers strengthens concrete preparation method, comprises the steps:
(1) cleaning sand, stone, and make it be in drying regime;
(2) cement, sand, stone are pressed mass ratio and 1: 1.45～2.2: 1.78～2.73 drop in the mix equipment, press steel fiber and concrete volume ratio 0.6～0.8%: 1 input steel fiber again, mix is even;
(3) in water, cement quality than 0.30～0.48: 1 ratio is prepared water, presses the mass ratio 0.3～1.2%: 1 of high efficiency water reducing agent and cement, and presses 1m
3The ratio of concrete 0.6～1.2kg polymer fiber drops into to stir evenly in the described water and obtains mixture;
(4) mixture that contains high efficiency water reducing agent, polymer fiber and water that step (3) is obtained drops in the concrete mixing equipment, and the back discharging that stirs is prepared into steel fiber/polymer fiber geminal fibers and strengthens concrete.
Above-mentioned steel fiber/polymer fiber geminal fibers strengthens among the concrete preparation method, and described polymer fiber is staple fibre polypropylene or polyacrylonitrile.
Above-mentioned steel fiber/polymer fiber geminal fibers strengthens among the concrete preparation method, and described high efficiency water reducing agent is highly enriched pulvis, and described high efficiency water reducing agent is a main component with the high condenses of aliphatic hydroxyl sulphonate.
Above-mentioned steel fiber/polymer fiber geminal fibers strengthens among the concrete preparation method, and described sand is medium sand.
Above-mentioned steel fiber/polymer fiber geminal fibers strengthens among the concrete preparation method, and the grating of described stone is 5～20mm continuous grading.
Above-mentioned steel fiber/polymer fiber geminal fibers strengthens among the concrete preparation method, and sand, stone should clean in advance, and makes it be in drying regime in use, otherwise occurs conglomeration when stirring easily.
The present invention also provides the steel fiber/polymer fiber geminal fibers that is obtained by above-mentioned preparation method to strengthen concrete.
It is consistent with the normal concrete maintenance process that steel fiber of the present invention/polymer fiber geminal fibers strengthens concrete maintenance process after cast.
Below the part principle of technical solution of the present invention is described further: deck paving does not have structural purpose usually, mainly is weather resistance and the service life that is used to improve bridge floor.On the one hand, bridge deck pavement will have enough intensity to bear and the diverging traffic wheel load, and the abrasion of enough wear resistance opposing wheels are arranged; On the other hand, bridge deck pavement will have enough toughness to satisfy the distortion of bridge deck structure, prevents crack and the fissured expansion of opposing, improves the permeability resistance of the layer of mating formation, thereby improves the weather resistance of bridge floor, prolongs service life.The hole that exists in the concrete formation process, concrete impermeability depends mainly on the control that the crack is produced and expands.Steel fiber/polymer fiber geminal fibers strengthens concrete and has overcome steel fiber reinforced concrete and the concrete shortcoming of polymer fiber, has brought into play advantage separately.At the concrete coagulation formative stage, polymer fiber has suppressed the formation and development of microfracture in the concrete substrate on μ m yardstick, has effectively reduced the quantity and the size of microfracture, has improved concrete fragility, has improved concrete toughness and impermeability.In the concrete curing carrying stage, evenly disorderly in concrete substrate, effectively reduce the stress concentration at initial imperfection place to the steel fiber that distributes, generation and expansion by bridge linking effect inhibition crackle improve concrete first crack strength, bend ductility, impermeability, weather resistance etc.Simultaneously, tension, bending resistance, slip resistance, shock resistance, the antifatigue that the mixing of steel fiber can effectively be improved reinforced concrete, split performance such as back toughness, this has exactly remedied polymer fiber and concrete strength is improved not have the deficiency contributed.Therefore, steel fiber/polymer fiber geminal fibers enhancing concrete is the type material that satisfies excellent in design deck paving system needs.
The present invention compared with prior art has following advantage:
The present invention reaches the defective of poor performance such as the defective that overcomes poor performance such as Steel Fiber Reinforced Concrete incipient crack, infiltration, wear-resisting, distortion, contraction and the bending resistance of polymer fiber concrete, tension, shearing resistance, antifatigue, shock resistance by technique scheme, have anti-first crack strength height, impermeabilisation, wear-resisting, deformation performance is good, contraction is little, bending resistance, tension, slip resistance height, effect such as antifatigue, shock resistance are good.Under the synergy of steel fiber and polymer fiber, weakness obviously is overcome, and each component property has obtained giving full play to, and has formed the well behaved matrix material of tempering toughness with gentleness.
Generally speaking, steel fiber/polymer fiber geminal fibers strengthens concrete and has overcome Steel Fiber Reinforced Concrete and the concrete deficiency of polymer fiber, both advantages have been brought into play, have that the incipient crack is few, first crack strength is high, stretching-resisting bending-resisting intensity height, shock resistance height, anti-fatigue performance are good, good endurance, impervious premium properties such as good, and operational procedure and technology do not have particular requirement.Steel fiber/polymer fiber geminal fibers strengthens concrete over-all properties height, and reasonable price is mated formation and new, old cement concrete pavement cover overlay field has wide promotion prospect in concrete bridge bridge floor rigidity.
Embodiment
It is as follows that steel fiber of the present invention/polymer fiber geminal fibers strengthens concrete formulation:
Wherein cement is ordinary Portland cement, and water reducer is a high efficiency water reducing agent, is to be main component with the high condenses of aliphatic hydroxyl sulphonate, is highly enriched pulvis.Polymer fiber is the commercially available prod.Sand is medium sand, and the grating of stone is 5～20mm continuous grading; The volume of polymer fiber is the polymer fiber quality of per 1 cubic meter of concrete; The steel fiber volume ratio is steel fiber and concrete volume ratio.
Below in conjunction with embodiment concrete enforcement of the present invention is described further, but enforcement of the present invention and protection domain are not limited thereto.
Embodiment 1
Preparation steel fiber/polymer fiber geminal fibers strengthens concrete starting material:
(1) cement: strength grade is 32.5 ordinary Portland cement;
(2) sand: river sand, apparent density 2.65g/cm
3, tap density 1400kg/m
3, porosity 47.2%, silt content 1%, fineness modulus 2.8 is medium sand;
(3) rubble: artificial rolling granite stones, particle diameter＜20mm;
(4) steel fiber: shear model steel fiber, length 30mm, equivalent diameter 0.69mm, length-to-diameter ratio 45, tensile strength＞755MPa;
(5) polymer fiber: polypropylene fibre or polyacrylonitrile fibre, pencil monofilament, length 12/19mm, diameter 20/38 μ m, tensile strength＞500MPa;
(6) water reducer: KJ-5 high efficiency water reducing agent, high dense, pulvis.
It is as follows that steel fiber/the polymer fiber geminal fibers strengthens concrete preparation method:
(1) cleaning sand, stone, and make it be in drying regime;
(2) after steel fiber is poured out, check, reject the steel fiber that corrosion, conglomeration are arranged from bag;
(3) cement, sand, stone are pressed mass ratio and dropped in mix equipment at 1: 1.82: 2.23, press steel fiber and concrete volume ratio again and drop into steel fiber at 0.6%: 1, mix is even;
(4) prepare water in water, cement quality ratio, press the mass ratio 0.48%: 1 of high efficiency water reducing agent and cement, press 1m than 0.44: 1
3The ratio of concrete 1.2kg polymer fiber drops into to stir evenly in the water and obtains mixture;
(5) mixture that will contain high efficiency water reducing agent, polymer fiber and water drops in the concrete mixing equipment, gets final product discharging after stirring, and is prepared into steel fiber/polymer fiber geminal fibers and strengthens concrete.
The grating of described stone is 5～20mm continuous grading.
Embodiment 2
Preparation steel fiber/polymer fiber geminal fibers strengthens concrete starting material:
(1) cement: strength grade is 32.5 ordinary Portland cement;
(2) sand: river sand, apparent density 2.65g/cm
3, tap density 1400kg/m
3, porosity 47.2%, silt content 1%, fineness modulus 2.8 is medium sand;
(3) rubble: artificial rolling granite stones, particle diameter＜20mm;
(4) steel fiber: shear model steel fiber, length 30mm, equivalent diameter 0.69mm, length-to-diameter ratio 45, tensile strength＞755MPa;
(5) polymer fiber: polypropylene fibre or polyacrylonitrile fibre, pencil monofilament, length 12/19mm, diameter 20/38 μ m, tensile strength＞500MPa;
(6) water reducer: KJ-5 high efficiency water reducing agent, high dense, pulvis.
It is as follows that steel fiber/the polymer fiber geminal fibers strengthens concrete preparation method:
(1) cleaning sand, stone, and make it be in drying regime;
(2) after steel fiber is poured out, check, reject the steel fiber that corrosion, conglomeration are arranged from bag;
(3) cement, sand, stone are pressed mass ratio and dropped in mix equipment at 1: 1.82: 2.23, press steel fiber and concrete volume ratio again and drop into steel fiber at 0.8%: 1, mix is even;
(4) prepare water in water, cement quality ratio, press the mass ratio 0.48%: 1 of high efficiency water reducing agent and cement, press 1m than 0.44: 1
3The ratio of concrete 0.9kg polymer fiber drops into to stir evenly in the water and obtains mixture;
(5) mixture that will contain high efficiency water reducing agent, polymer fiber and water drops in the concrete mixing equipment, gets final product discharging after stirring, and is prepared into steel fiber/polymer fiber geminal fibers and strengthens concrete.
The grating of described stone is 5～20mm continuous grading.
Embodiment 3
Preparation steel fiber/polymer fiber geminal fibers strengthens concrete starting material:
(1) cement: strength grade is 32.5 ordinary Portland cement;
(2) sand: river sand, apparent density 2.65g/cm
3, tap density 1400kg/m
3, porosity 47.2%, silt content 1%, fineness modulus 2.8 is medium sand;
(3) rubble: artificial rolling granite stones, particle diameter＜20mm;
(4) steel fiber: shear model steel fiber, length 30mm, equivalent diameter 0.69mm, length-to-diameter ratio 45, tensile strength＞755MPa;
(5) polymer fiber: polypropylene fibre or polyacrylonitrile fibre, pencil monofilament, length 12/19mm, diameter 20/38 μ m, tensile strength＞500MPa;
(6) water reducer: KJ-5 high efficiency water reducing agent, high dense, pulvis.
It is as follows that steel fiber/the polymer fiber geminal fibers strengthens concrete preparation method:
(1) cleaning sand, stone, and make it be in drying regime;
(2) after steel fiber is poured out, check, reject the steel fiber that corrosion, conglomeration are arranged from bag;
(3) cement, sand, stone are pressed mass ratio and dropped in mix equipment at 1: 1.82: 2.23, press steel fiber and concrete volume ratio again and drop into steel fiber at 0.8%: 1, mix is even;
(4) prepare water in water, cement quality ratio, press the mass ratio 0.48%: 1 of high efficiency water reducing agent and cement, press 1m than 0.44: 1
3The ratio of concrete 1.2kg polymer fiber drops into to stir evenly in the water and obtains mixture;
(5) mixture that will contain high efficiency water reducing agent, polymer fiber and water drops in the concrete mixing equipment, gets final product discharging after stirring, and is prepared into steel fiber/polymer fiber geminal fibers and strengthens concrete.
The grating of described stone is 5～20mm continuous grading.
Prepare steel fiber/polymer fiber geminal fibers with preparation method of the present invention and strengthen concrete, not only have high permeability resistant, high-durability, and have good shock resistance and anti-fatigue performance (as shown in table 1), can prolong the work-ing life of deck paving effectively.Adopt the present invention that the bridge floor of the road surface of " 119 provincial highway " mileage K54+930-K54+960 and coupled numb Kan bridge has been carried out the transformation on old bridge floor, road surface, steel fiber in the pavement process/polymer fiber geminal fibers strengthens concrete and adopts job mix, is evenly distributed in concrete through two kinds of fibers of random inspection; It is good that this transforms highway section running condition.Laboratory and engineering applicable cases all show, prepares steel fiber/polymer fiber geminal fibers with preparation method of the present invention and strengthen concrete and can be widely used in that concrete bridge bridge floor rigidity is mated formation and new, old cement concrete pavement cover overlays.
The performance comparison of the different concrete materials of table 1
Claims (6)
1. steel fiber/polymer fiber geminal fibers strengthens concrete preparation method, it is characterized in that comprising the steps:
(1) cleaning sand, stone, and make it be in drying regime;
(2) cement, sand, stone are pressed mass ratio and 1: 1.45～2.2: 1.78～2.73 drop in the mix equipment, press steel fiber and concrete volume ratio 0.6～0.8%: 1 input steel fiber again, mix is even;
(3) in water, cement quality than 0.30～0.48: 1 ratio is prepared water, presses the mass ratio 0.3～1.2%: 1 of high efficiency water reducing agent and cement, and presses 1m
3The ratio of concrete 0.6～1.2kg polymer fiber drops into to stir evenly in the described water and obtains mixture;
(4) mixture that contains high efficiency water reducing agent, polymer fiber and water that step (3) is obtained drops in the concrete mixing equipment, and the back discharging that stirs is prepared into steel fiber/polymer fiber geminal fibers and strengthens concrete.
2. steel fiber according to claim 1/polymer fiber geminal fibers strengthens concrete preparation method, it is characterized in that described polymer fiber is staple fibre polypropylene or polyacrylonitrile.
3. steel fiber according to claim 1/polymer fiber geminal fibers strengthens concrete preparation method, it is characterized in that described high efficiency water reducing agent is highly enriched pulvis, and described high efficiency water reducing agent is a main component with the high condenses of aliphatic hydroxyl sulphonate.
4. steel fiber according to claim 1/polymer fiber geminal fibers strengthens concrete preparation method, it is characterized in that described sand is medium sand.
5. steel fiber according to claim 1/polymer fiber geminal fibers strengthens concrete preparation method, and the grating that it is characterized in that described stone is 5～20mm continuous grading.
6. the steel fiber that is obtained by the described preparation method of claim 1/polymer fiber geminal fibers strengthens concrete.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846737A (en) * | 2015-05-14 | 2015-08-19 | 吉林省银河水利水电新技术设计有限公司 | Flexible freeze-thaw resistance treatment method for highway bridge expansion joints in seasonal frozen soil region |
| CN104878692A (en) * | 2015-04-27 | 2015-09-02 | 吉林省银河水利水电新技术设计有限公司 | Hydraulic concrete internal anchoring method for stay ropes with bidirectional punched steel plate hanging structures |
| CN105418008A (en) * | 2015-12-15 | 2016-03-23 | 湖北工业大学 | Root-resisting waterproof concrete and green roof structure |
| CN105777012A (en) * | 2016-03-24 | 2016-07-20 | 西京学院 | Recycled concrete with highly effective damping property |
| CN106082874A (en) * | 2016-06-23 | 2016-11-09 | 黄河科技学院 | Shellproof explosion-proof brick of high-load hybrid fiber concrete and preparation method thereof |
| CN108328989A (en) * | 2018-03-16 | 2018-07-27 | 株洲博尔曼科技发展有限公司 | A kind of discarded FRP concrete and preparation method thereof |
| CN110937868A (en) * | 2019-12-24 | 2020-03-31 | 南昌航空大学 | Self-compacting hybrid fiber concrete and preparation method thereof |
| CN111454025A (en) * | 2019-01-22 | 2020-07-28 | 广州广电运通金融电子股份有限公司 | Concrete, preparation method thereof and safe box |
| RU2750501C2 (en) * | 2019-07-30 | 2021-06-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Череповецкий государственный университет" | Fiber from pet containers for polystyrene concrete |
-
2010
- 2010-08-20 CN CN 201010260437 patent/CN101985393A/en active Pending
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| 《中国优秀硕士学位论文全文数据库 工程科技II辑》 20071015 孙海燕 混杂纤维混凝土性能的试验研究 第9-17页 1-6 , 第04期 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878692A (en) * | 2015-04-27 | 2015-09-02 | 吉林省银河水利水电新技术设计有限公司 | Hydraulic concrete internal anchoring method for stay ropes with bidirectional punched steel plate hanging structures |
| CN104878692B (en) * | 2015-04-27 | 2016-08-17 | 吉林省银河水利水电新技术设计有限公司 | Anchor method in the concrete for hydraulic structure of a kind of two-way punched steel plate mounting drag-line |
| CN104846737A (en) * | 2015-05-14 | 2015-08-19 | 吉林省银河水利水电新技术设计有限公司 | Flexible freeze-thaw resistance treatment method for highway bridge expansion joints in seasonal frozen soil region |
| CN105418008A (en) * | 2015-12-15 | 2016-03-23 | 湖北工业大学 | Root-resisting waterproof concrete and green roof structure |
| CN105777012A (en) * | 2016-03-24 | 2016-07-20 | 西京学院 | Recycled concrete with highly effective damping property |
| CN106082874A (en) * | 2016-06-23 | 2016-11-09 | 黄河科技学院 | Shellproof explosion-proof brick of high-load hybrid fiber concrete and preparation method thereof |
| CN108328989A (en) * | 2018-03-16 | 2018-07-27 | 株洲博尔曼科技发展有限公司 | A kind of discarded FRP concrete and preparation method thereof |
| CN111454025A (en) * | 2019-01-22 | 2020-07-28 | 广州广电运通金融电子股份有限公司 | Concrete, preparation method thereof and safe box |
| RU2750501C2 (en) * | 2019-07-30 | 2021-06-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Череповецкий государственный университет" | Fiber from pet containers for polystyrene concrete |
| CN110937868A (en) * | 2019-12-24 | 2020-03-31 | 南昌航空大学 | Self-compacting hybrid fiber concrete and preparation method thereof |
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Application publication date: 20110316 |