CN110256014A - A kind of FRP grid reinforcing complex cement base binding material and preparation method thereof - Google Patents
A kind of FRP grid reinforcing complex cement base binding material and preparation method thereof Download PDFInfo
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- CN110256014A CN110256014A CN201910590234.9A CN201910590234A CN110256014A CN 110256014 A CN110256014 A CN 110256014A CN 201910590234 A CN201910590234 A CN 201910590234A CN 110256014 A CN110256014 A CN 110256014A
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- 239000004568 cement Substances 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 230000003014 reinforcing effect Effects 0.000 title abstract description 12
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 30
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004917 carbon fiber Substances 0.000 claims abstract description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000006004 Quartz sand Substances 0.000 claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 13
- 239000010703 silicon Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002956 ash Substances 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 9
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 8
- 229920000642 polymer Polymers 0.000 claims abstract description 8
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- 101100002917 Caenorhabditis elegans ash-2 gene Proteins 0.000 claims abstract description 4
- 239000010883 coal ash Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims 1
- 239000011150 reinforced concrete Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 22
- 239000004567 concrete Substances 0.000 description 18
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 239000010410 layer Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000002742 anti-folding effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- 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
- C04B28/04—Portland cements
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of FRP grid reinforcing complex cement base binding materials and preparation method thereof, each raw material component and content are by weight percentage are as follows: P.O52.5 cement 18%-20%, level-one flyash 36%-38%, silicon ash 2%-3%, wash quartz sand 22%-23%, water 17%-19%, chopped carbon fiber 0.5%-1.0%, polycarboxylate water-reducer 1.2%-1.5%, styrene hydroxy polymer type tackifier 0.2%-0.5%, reinforcing agent 0.5%-0.8%, the sum of above raw material weight percentage is 100%, wherein the length range of chopped carbon fiber is 6mm-10mm and its volume is the 0.5%-1.0% of the above material total volume, the preparation method comprises the following steps: by P.O52.5 cement, level-one Flyash, silicon ash, chopped carbon fiber, washing quartz sand mix in proportion after being put into and stirring 3 minutes in blender, styrene hydroxy polymer type tackifier and reinforcing agent is added, it is stirred for 2 minutes, water and polycarboxylate water-reducer is added quickly to stir 5 minutes again, repairing effect is good and environmentally friendly, can effectively improve reinforced concrete member bearing capacity and durability.
Description
Technical field
The present invention relates to FRP grid reinforcing complex cement base binding material fields, and in particular to a kind of FRP grid reinforcing
With complex cement base binding material and preparation method thereof.
Background technique
Since construction technology and usability, durability etc. influence, inevitably there is constructional deficiency (bee in reinforced concrete structure
Nest, pitted skin, dew muscle etc.), damage deterioration (concrete damaged, steel bar corrosion) situations such as.At present for the reinforcing one of such component
As be first to clean substrate surface, the concrete of defect is repaired using epoxy resin glue FRP sheet material after polishing smooth
It reinforces；FRP is presently found comparatively ideal construction material reinforcing fiber, has high specific strength, high ratio modulus, high temperature resistant, resistance to
Burn into conduction and the small equal excellent properties of thermal expansion coefficient.Conventionally employed epoxy resin glue FRP restorative procedure, although in short term
It is able to satisfy the intensity requirement of concrete, but is polluted the environment, height is required to construction environment, and organic material is easy to aging, influences to add
Gu effect.
The study found that silicon ash is added in cement-based material can be improved its caking property；Flyash, which is added, can be improved its morning
Phase intensity；The addition of carbon fiber increases the Tensile strength, plays the role of toughening；When carbon fiber is in cement-based material
When evenly dispersed, the resistance to compression of CFRCM, tensile strength increase, and tensile strength promotion amplitude is very big.Meanwhile carbon fiber
The addition of dimension can also play good improvement result to the brittle snap characteristics of cement.
Summary of the invention
For above-mentioned technical deficiency, the object of the present invention is to provide a kind of FRP grid reinforcing complex cement bases
Binding material and preparation method thereof, repairing effect is good and environmentally friendly, can effectively improve reinforced concrete member bearing capacity and resistance to
Long property.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
The present invention provides a kind of FRP grid reinforcing complex cement base binding material, and each raw material component and content are by weight
Percentages are as follows: P.O52.5 cement 18%-20%, level-one flyash 36%-38%, silicon ash 2%-3% wash quartz sand
22%-23%, chopped carbon fiber 0.5%-1.0%, styrene hydroxy polymer type tackifier 0.2%-0.5%, reinforcing agent
0.5%-0.8%, polycarboxylate water-reducer 1.2%-1.5%, water 17%-19%, the sum of above raw material weight percentage are
100%, wherein the length range of chopped carbon fiber is 6mm-10mm and its volume is the 0.5%- of the above material total volume
1.0%, this material is suitable for repairing for the concrete structure that the practical compression strength of concrete is 30MPa or less or surface layer badly broken
Multiple reinforcing engineering.
Preferably, 200 mesh of quartz sand diameter, 5.4%, 28 day activity index 80 of level-one fineness of pulverized-coal ash, in silicon ash are washed
SiO2Content reaches 90% or more, chopped carbon fiber density 1.82g/cm3, 7.3 μm of filament diameter, monofilament pull strength
4651Mpa。
The present invention also provides a kind of method for preparing FRP grid reinforcing complex cement base binding material as described above,
The following steps are included: P.O52.5 cement, level-one flyash, silicon ash, chopped carbon fiber, washing quartz sand are mixed in proportion
It is even be put into stirred 3 minutes in blender after, styrene hydroxy polymer type tackifier and reinforcing agent is added, is stirred for 2 minutes, adds
Water and polycarboxylate water-reducer quickly stir 5 minutes again.
The beneficial effects of the present invention are: belong to isotropic material using cement-based material and original concrete interface, coordinate
Property good advantage, effectively repair concrete interface and improve cohesiveness between the two；Fluidity is more than 90mm, 28d tension in 60min
Intensity is more than 4.0MPa, and flexural strength is more than 10.0MPa, and adhesion strength reaches 2.15MPa.
Specific embodiment
The present invention is specifically described below with reference to embodiment, but the present invention is not limited to following embodiments.Benchmark 1,
Benchmark 2 and benchmark 3 are the ordinary cement sill for not adding chopped carbon fiber, and main component and content are as follows: cement 18%-
20%, flyash 36%-38%, silicon ash 2%-3% wash quartz sand 22%-23%, water 17%-19%, water-reducing agent 1.2%-
1.5%, tackifier 0.2%-0.5%, reinforcing agent 0.5%-0.8%.
A kind of FRP grid reinforcing preparation of complex cement base binding material: cement uses P.O52.5 class g cement；Washing
200 mesh of quartz sand diameter；5.4%, 28 day activity index 80 of fineness of pulverized-coal ash；Quartz sand is that 200 mesh wash quartz sand；Fiber is
Hebei Cangzhou Zhong Li new material Science and Technology Ltd. produces 6mm-10mm chopped carbon fiber；Water-reducing agent is polycarboxylate water-reducer (liquid
State)；SiO in silicon ash2Content reaches 90%；Tackifier are styrene hydroxy polymer；Water is tap water.
Preparation method is to mix in proportion cement, flyash, silicon ash, chopped carbon fiber, fine quartz sand etc. and be put into
After being stirred 3 minutes in blender, tackifier and early strength agent is added, is stirred for 2 minutes, water and water-reducing agent is added quickly to stir 5 points again
Clock can obtain this product.
1 complex cement sill constituent content of table: unit (g)
Performance test:
(1) fluidity test method: with planetary cement mortar mixer by desired amount of Carbon Fiber Cement Composites
It has mixed in 3min and has poured into mold, paste materials need suitable for reading concordant with mold and struck off excess surface slurry with scraper；It surveys
From lifting truncated cone circle mould while opening manual time-keeping after test material slurry body injection mold, to guarantee when lifting mold vertically, by carbon
Fiber cement-based material slurry flows freely 30s in glass pane surface；With ruler respectively along the Vertical Square of slurry levelling part two
Maximum gauge is measured upwards, and taking its average value is the fluidity of Carbon Fiber Cement Composites；During testing herein, initial flow
Degree test interior completion and should should repeatedly be sampled and be tested to prevent there are flow losses in 3min, results are averaged with
Reduce error.
(2) Mechanics Performance Testing: flexural strength and intensity test test block are according to GB/T 17671-1999 " cement gel
Sand ruggedness test method (ISO method) " it is designed；Sample dimensions are 40mm × 40mm × 160mm prism, compression strength examination
It tests using the cement base prism test block after fractureing, test specimen compression area is 40mm × 40mm；Uniaxial compression test is using identical
Size prism test specimen, pressure-bearing surface are 40mm × 40mm；Test for tensile strength uses uniaxial direct tensile method, and test specimen uses dumbbell shape.
Test result is as shown in table 2:
2 cement-base composite material slump test result of table
Material property comparison:
In document [1], when chopped carbon fiber volume is 0.24%, compression strength value is improved than plain concrete strength
10% or so.In document [2], when using 10mm carbon fiber, volume as 0.6%, the compression strength maximum of CFRC composite material is mentioned
It is high by 22.6%.
In the present invention, test specimen 1~3 increases 30.8%-42.0%, 28 days anti-foldings than 28 days compression strength of benchmark test specimen 1
Gain in strength 102%-169%, tensile strength increase 84%-185%；28 day compression strength of the test specimen 4~6 than benchmark test specimen 2
Increase 28.0%-41.6%, 28 days flexural strengths increase 140%-200%, and tensile strength increases 56%-73%；Test specimen 7~9
28 days compression strength than benchmark test specimen 3 increase 12.9%-20.2%, and flexural strength increases 75%-269% within 28 days, and tension is strong
Degree increases 112%-156%.As it can be seen that cement-based material performance of the invention is super than not adding the benchmark test specimen of carbon fiber to improve degree
Cross document [1] and document [2].
Document [1] Wang Xiaochu, Liu Hongtao, Zhou Le " carbon fiber reinforced concrete mechanical property and damage -form experimental study "
[C] // the 21st the IIth .2012 of national Structural Engineering science proceeding.
Document [2] Sun Jie, Wei Shumei " preparation of Carbon Fiber Reinforced Cement Composites and its performance study " [J] is new
Type construction material, 2018,45 (10): 66-69.
Consolidation effect verifying:
Scheme of Strengthening: cement matrix material formula is chosen are as follows: P.O52.5 cement 19.2%, level-one flyash 36.8%, silicon ash
2.8%, 200 mesh wash quartz sand 22.3%, water 18.2%, 10mm chopped carbon fiber 0.7%, polycarboxylate water-reducer 1.5%, benzene
Ethylene hydroxy polymer type tackifier 0.4%, reinforcing agent 0.5%；28d flexural strength 12.6MPa, tensile strength 4.55MPa.
First reinforced beam is carried out digging rough processing and clear up surface floating dust, beams of concrete is smeared with cement base
Face, it is anti-bend reinforced in beams of concrete sole length direction affixing carbon fabric or grid progress, then in beams of concrete two sides 750mm
U-shaped affixing carbon fabric or grid carry out Shear Strengthening in range, later with same sequence and mode again to beams of concrete
Carry out bending resistance and Shear Strengthening；After carbon fiber mesh or sheet material are infiltrated with cement-based material, it is pasted onto former concrete surface layer,
Its outer layer smears one layer of cement and material again.
Consolidation effect is as shown in table 3:
3 RC beam of table reinforces front and back test result
The development for limiting and slowing down diagonal crack is reinforced, the crack fecund of reinforcement is born in non-affixing carbon fabric (net)
Simple bending section region and U-shaped hoop boundary, improve the shear resistance of beam；The damage -form for changing beam is reinforced, unguyed beam is broken
Bad form is compression shear destruction, and the final damage -form of reinforcement is mostly that curved scissors destroys, and reinforcing layer does not occur with concrete component
Unsticking situation.
In use, cleaning damaged concrete surface and after removing the residue on surface, by concrete surface layer dabbing；Original
Concrete material surface layer smears a thin layer of cement-based material reparation, after FRP grid or sheet material are infiltrated with cement-based material,
It is pasted onto former concrete surface layer, smears one layer of cement and material again in its outer layer.Method is simple, repairing effect is good and environmentally friendly, energy
Effectively improve reinforced concrete member bearing capacity and durability
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (3)
1. a kind of FRP grid, which is reinforced, uses complex cement base binding material, which is characterized in that each raw material component and content by weight hundred
Divide ratio to be calculated as: P.O52.5 cement 18%-20%, level-one flyash 36%-38%, silicon ash 2%-3% wash quartz sand 22%-
23%, chopped carbon fiber 0.5%-1.0%, styrene hydroxy polymer type tackifier 0.2%-0.5%, reinforcing agent 0.5%-
0.8%, polycarboxylate water-reducer 1.2%-1.5%, water 17%-19%, the sum of above raw material weight percentage are 100%, wherein
The length range of chopped carbon fiber is 6mm-10mm and its volume is the 0.5%-1.0% of the above material total volume.
2. a kind of FRP grid as described in claim 1, which is reinforced, uses complex cement base binding material, which is characterized in that washing stone
200 mesh of sand diameter, 5.4%, 28 day activity index 80 of level-one fineness of pulverized-coal ash, SiO in silicon ash2Content reach 90% and with
On, chopped carbon fiber density 1.82g/cm3, 7.3 μm of filament diameter, monofilament pull strength 4651Mpa.
3. a kind of FRP grid as described in claim 1 reinforces the preparation method for using complex cement base binding material, feature exists
In, comprising the following steps: P.O52.5 cement, level-one flyash, silicon ash, chopped carbon fiber, washing quartz sand are mixed in proportion
It is uniformly put into after being stirred 3 minutes in blender, styrene hydroxy polymer type tackifier and reinforcing agent is added, is stirred for 2 minutes,
Water and polycarboxylate water-reducer is added quickly to stir 5 minutes again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910590234.9A CN110256014B (en) | 2019-06-27 | 2019-06-27 | Composite cement-based bonding material for reinforcing FRP (fiber reinforced Plastic) grating and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910590234.9A CN110256014B (en) | 2019-06-27 | 2019-06-27 | Composite cement-based bonding material for reinforcing FRP (fiber reinforced Plastic) grating and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110256014A true CN110256014A (en) | 2019-09-20 |
| CN110256014B CN110256014B (en) | 2020-10-09 |
Family
ID=67923911
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| CN201910590234.9A Active CN110256014B (en) | 2019-06-27 | 2019-06-27 | Composite cement-based bonding material for reinforcing FRP (fiber reinforced Plastic) grating and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482817A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | FRP (fiber reinforced plastic)/high-ductility high-permeability concrete bidirectional reinforced damaged reinforced concrete slab and preparation method thereof |
| CN112482813A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof |
| CN112482815A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | Rigid FRP grid/ECC permeable hoop restraining and reinforcing damaged reinforced concrete column and preparation method thereof |
| CN112627573A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | Rigid FRP grid/high-ductility high-permeability concrete restrained reinforced concrete column and preparation method thereof |
| CN112627572A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | One-way FRP grid/ECC permeation type reinforced concrete beam for reinforcing damage and preparation method thereof |
| CN112627574A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | One-way FRP grid/ECC double-sided adhesive type reinforced concrete beam for reinforcing damage and preparation method thereof |
| CN112627571A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | Hard FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and preparation method thereof |
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2019
- 2019-06-27 CN CN201910590234.9A patent/CN110256014B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482817A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | FRP (fiber reinforced plastic)/high-ductility high-permeability concrete bidirectional reinforced damaged reinforced concrete slab and preparation method thereof |
| CN112482813A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof |
| CN112482815A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | Rigid FRP grid/ECC permeable hoop restraining and reinforcing damaged reinforced concrete column and preparation method thereof |
| CN112627573A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | Rigid FRP grid/high-ductility high-permeability concrete restrained reinforced concrete column and preparation method thereof |
| CN112627572A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | One-way FRP grid/ECC permeation type reinforced concrete beam for reinforcing damage and preparation method thereof |
| CN112627574A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | One-way FRP grid/ECC double-sided adhesive type reinforced concrete beam for reinforcing damage and preparation method thereof |
| CN112627571A (en) * | 2020-12-03 | 2021-04-09 | 武汉大学 | Hard FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and preparation method thereof |
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| Publication number | Publication date |
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| CN110256014B (en) | 2020-10-09 |
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