CN115180864B - Bridge deck fluid concrete rapid plasticizing material - Google Patents
Bridge deck fluid concrete rapid plasticizing material Download PDFInfo
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- CN115180864B CN115180864B CN202210818869.1A CN202210818869A CN115180864B CN 115180864 B CN115180864 B CN 115180864B CN 202210818869 A CN202210818869 A CN 202210818869A CN 115180864 B CN115180864 B CN 115180864B
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- fluid concrete
- alkali
- plasticizing material
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- 239000004567 concrete Substances 0.000 title claims abstract description 112
- 239000012530 fluid Substances 0.000 title claims abstract description 81
- 239000000463 material Substances 0.000 title claims abstract description 46
- 239000011347 resin Substances 0.000 claims abstract description 63
- 229920005989 resin Polymers 0.000 claims abstract description 63
- 239000002775 capsule Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 4
- 239000002250 absorbent Substances 0.000 claims description 35
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 33
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 18
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 17
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 12
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 11
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 11
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 11
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 11
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 9
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 8
- FBCQUCJYYPMKRO-UHFFFAOYSA-N prop-2-enyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC=C FBCQUCJYYPMKRO-UHFFFAOYSA-N 0.000 claims description 8
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims description 3
- 239000002101 nanobubble Substances 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 11
- 238000005086 pumping Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 4
- CADZRPOVAQTAME-UHFFFAOYSA-L calcium;hydroxy phosphate Chemical group [Ca+2].OOP([O-])([O-])=O CADZRPOVAQTAME-UHFFFAOYSA-L 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical group [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011376 self-consolidating concrete Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 description 1
- 238000012795 verification Methods 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a bridge deck fluid concrete rapid plasticizing material, and belongs to the technical field of concrete additives. The bridge deck fluid concrete rapid plasticizing material comprises the following components: the vibrating escaping part and the water-absorbing resin wrapped by the alkali-soluble capsule wall; wherein the vibrating escaping part is a substance which generates bubbles after vibrating. According to the invention, the rapid plasticizing material is mixed before the fluid concrete is poured, and after the rapid plasticizing material is poured on the bridge deck, the vibration escape part in the rapid plasticizing material is vibrated to generate micro-nano bubbles to escape the concrete, so that the viscosity of the fluid concrete is enhanced, the fluidity is reduced, the plasticity of the fluid concrete is enhanced, and the hardened surface is flat; the water-absorbing resin wrapped by the alkali-soluble capsule wall in the rapid plasticizing material releases the wrapped water-absorbing resin after the capsule wall is dissolved by the alkali-soluble fluid concrete, so that the water in the fluid concrete is rapidly absorbed, the fluidity of the water-absorbing resin is reduced, the plasticity is improved, and the hardened surface is flat.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a bridge deck fluid concrete rapid plasticizing material.
Background
The fluid concrete (Flowing concrete) is a concrete which is prepared by mixing an additive (fluidizer) into a standard mix concrete with a ready-mixed slump of 80-120 mm, and adding the standard mix concrete mixture with a secondary mixing to increase the slump of the standard mix concrete mixture to 180-200 mm at the time, so that the concrete can freely flow and fill a model or a small steel bar gap, and is also called superplastic concrete (Superlastic coucrete), and is also called self-compacting concrete. The concrete can flow and uniformly enter the whole model only by self weight without external vibration, and is characterized in that the inherent self-compaction can meet the construction requirement and has quality assurance.
When the bridge deck is built, the used concrete needs to have strong fluidity, so that the pumping of the concrete is facilitated, the rapid expansion of the construction is facilitated, however, after the concrete with strong fluidity is hardened, the flatness of the concrete is poor, and the concrete is difficult to control.
Disclosure of Invention
Aiming at the technical problems, the invention provides a bridge deck fluid concrete rapid plasticizing material. Mixing a quick plasticizing material before pouring the fluid concrete, vibrating a vibrating escape part in the quick plasticizing material after pouring the fluid concrete on a bridge floor to generate micro-nano bubbles, escaping the concrete, enhancing the viscosity of the fluid concrete, reducing the fluidity, enhancing the plasticity of the fluid concrete, and leveling the surface after hardening; the water-absorbing resin wrapped by the alkali-soluble capsule wall in the rapid plasticizing material releases the wrapped water-absorbing resin after the capsule wall is dissolved by the alkali-soluble fluid concrete, so that the water in the fluid concrete is rapidly absorbed, the fluidity of the water-absorbing resin is reduced, the plasticity is improved, and the hardened surface is flat.
In order to achieve the above purpose, the present invention provides the following technical solutions:
one of the technical schemes of the invention is as follows: provides a bridge deck fluid concrete rapid plasticizing material, which comprises the following components: the vibrating escaping part and the water-absorbing resin wrapped by the alkali-soluble capsule wall; wherein the vibrating escaping part is a substance which generates gas after vibrating.
Preferably, the mass ratio of the vibrating escaping part to the water-absorbent resin wrapped by the alkali-soluble capsule wall is (6-8) (2-4).
Preferably, the vibrating escaping part generates gas after vibrating at the frequency of 30-50 Hz to escape the concrete.
Preferably, the vibrating escaping part is obtained by reacting rosin resin, sulfuric acid, sodium hydroxide, ethylene glycol and pentaerythritol in water; wherein the mass ratio of the rosin resin, the sulfuric acid, the sodium hydroxide, the ethylene glycol, the pentaerythritol and the water is 60:5:3.5:15:10:150.
More preferably, the concrete preparation process of the vibrating escape part is as follows: adding rosin resin, sulfuric acid, ethylene glycol, pentaerythritol and water into a reaction vessel, heating at 80-85 ℃ for 1-1.5 h, then adding sodium hydroxide, heating to 90-95 ℃ for 1.5-2 h, and cooling to obtain a vibrating escape part.
Preferably, the mass ratio of the alkali-soluble capsule wall to the water-absorbent resin in the water-absorbent resin wrapped by the alkali-soluble capsule wall is (5-10) (15-30).
More preferably, the alkali-soluble capsule wall is polymerized by methyl methacrylate, styrene, acrylic acid and allyl methacrylate according to a mass ratio of 48:28:6:1;
the water-absorbent resin is polymerized by acrylic acid, acrylamide and N, N' -methylene bisacrylamide according to the mass ratio of 0.2:99.8:0.05.
More preferably, the specific preparation steps of the water absorbent resin wrapped by the alkali-soluble capsule wall comprise: adding acrylic acid, acrylamide, N' -methylene bisacrylamide and water into a reaction container, adding a dispersing agent and an initiator under the stirring action of 1000-1500 rpm, heating to 55-60 ℃, and reacting for 3h to obtain water-absorbent resin; continuously adding methyl methacrylate, styrene, acrylic acid and allyl methacrylate, and continuously reacting for 30min at 100-120 ℃ to obtain the water-absorbent resin wrapped by the alkali-soluble capsule wall.
The second technical scheme of the invention is as follows: the application of the bridge deck fluid concrete rapid plasticizing material in paving bridge decks by fluid concrete is provided.
The beneficial technical effects of the invention are as follows:
the components of the bridge deck fluid concrete rapid plasticizing material comprise a vibrating escape part and water-absorbing resin wrapped by an alkali-soluble capsule wall. Mixing a bridge deck fluid concrete rapid plasticizing material before pouring the fluid concrete, vibrating a vibrating escape part in the rapid plasticizing material after pouring the fluid concrete, generating micro-nano bubbles to escape the concrete, enhancing the viscosity of the fluid concrete, reducing the fluidity, enhancing the plasticity of the fluid concrete, and leveling the surface after hardening; the water-absorbing resin wrapped by the alkali-soluble capsule wall in the rapid plasticizing material releases the wrapped water-absorbing resin after the capsule wall is dissolved by the alkali-soluble fluid concrete, so that the water in the fluid concrete is rapidly absorbed, the fluidity of the water-absorbing resin is reduced, the plasticity is improved, and the hardened surface is flat.
According to the invention, the two components of the escape part and the water-absorbing resin wrapped by the alkali-soluble capsule wall are overlapped under the action of vibration, and after the triggering of vibration, the flow property of the fluid concrete is greatly reduced, so that the fluid concrete is changed into a plastic state from a flowing state in a short time.
By adding the bridge deck fluid concrete rapid plasticizing material provided by the invention, the fluid concrete has strong fluidity before pumping, the fluidity of the fluid concrete is reduced by vibrating after pumping, the viscosity and the plasticity are improved, so that the pumpability of the concrete is considered, the surface of the fluid concrete after solidification is leveled, and the bridge deck fluid concrete rapid plasticizing material is suitable for paving a bridge deck.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to. Unless otherwise specified, "parts" are parts by mass in the detailed description.
A bridge deck fluid concrete rapid plasticizing material comprises the following components: the vibrating escaping part and the water-absorbing resin wrapped by the alkali-soluble capsule wall; wherein the vibrating escaping part is a substance which generates gas after vibrating.
Preferably, the mass ratio of the vibrating escaping part to the water-absorbent resin wrapped by the alkali-soluble capsule wall is (6-8) (2-4).
Preferably, the vibrating escaping part is obtained by reacting rosin resin, sulfuric acid, sodium hydroxide, ethylene glycol and pentaerythritol in water; wherein the mass ratio of the rosin resin, the sulfuric acid, the sodium hydroxide, the ethylene glycol, the pentaerythritol and the water is 60:5:3.5:15:10:150.
The vibrating escaping part is added into the fluid concrete, so that micro-nano bubbles can be generated after vibrating, and the inside of the fluid concrete can be rapidly escaped under the vibrating action, so that the yield stress and the viscosity coefficient of the fluid concrete mixture are instantaneously increased, and the setting capacity of the fluid concrete is improved; meanwhile, the added vibrating escape component can also improve the lubricating performance among the fluid concrete particles, reduce the internal friction angle among the fluid concrete mixture particles, ensure that the fluid concrete mixture particles have stronger fluidity before pumping and lighten the pumping difficulty.
Preferably, the vibrating escaping part generates gas after vibrating at the frequency of 30-50 Hz to escape the concrete.
More preferably, the concrete preparation process of the vibrating escape part is as follows: adding rosin resin, sulfuric acid, ethylene glycol, pentaerythritol and water into a reaction vessel, heating at 80-85 ℃ for 1-1.5 h, then adding sodium hydroxide, heating to 90-95 ℃ for 1.5-2 h, and cooling to obtain a vibrating escape part.
Preferably, the mass ratio of the alkali-soluble capsule wall to the water-absorbent resin in the water-absorbent resin wrapped by the alkali-soluble capsule wall is (5-10) (15-30).
More preferably, the alkali-soluble capsule wall is polymerized by methyl methacrylate, styrene, acrylic acid and allyl methacrylate according to a mass ratio of 48:28:6:1;
the water-absorbent resin is polymerized by acrylic acid, acrylamide and N, N' -methylene bisacrylamide according to the mass ratio of 0.2:99.8:0.05.
More preferably, the specific preparation steps of the water absorbent resin wrapped by the alkali-soluble capsule wall comprise: adding acrylic acid, acrylamide, N' -methylene bisacrylamide and water into a reaction container, adding a dispersing agent and an initiator under the stirring action of 1000-1500 rpm, heating to 55-60 ℃, and reacting for 3h to obtain water-absorbent resin; continuously adding methyl methacrylate, styrene, acrylic acid and allyl methacrylate, and continuously reacting for 30min at 100-120 ℃ to obtain the water-absorbent resin wrapped by the alkali-soluble capsule wall.
The water-absorbent resin takes acrylic acid and acrylamide as polymerization monomers, N, N' -methylene bisacrylamide as a cross-linking agent, and is polymerized by initiating agent, and dispersed micro-nano particles are formed in water under the action of intense stirring and dispersing agent, wherein the added dispersing agent is calcium hydroxy phosphate, the added amount is 2% of the mass of the polymerization monomers, the added initiating agent is potassium persulfate, and the added amount is 0.5% of the mass of the polymerization monomers. And adding the raw material components of the alkali-soluble capsule wall to polymerize the raw material components on the surface of the dispersed micro-nano water-absorbent resin to form a shell-core structure for wrapping the water-absorbent resin. The formed shell structure is dissolved in alkaline concrete for 2-3 hours, so that the water-absorbent resin can be protected from being released before pumping, and the water-absorbent resin in the shell structure is released after pouring.
Example 1
Preparation of bridge deck fluid concrete rapid plasticizing material:
(1) Preparation of the vibrating escape part: rosin resin (60 parts), sulfuric acid (5 parts), ethylene glycol (15 parts), pentaerythritol (10 parts) and water (150 parts) are added into a reaction kettle, and the mixture is heated to 85 ℃ under the stirring action to react for 1h; then adding sodium hydroxide (3.5 parts), heating to 95 ℃, continuing to react for 1.5 hours, and cooling to obtain a vibrating escape part for later use;
(2) Preparation of alkali-soluble wall-coated water-absorbent resin: acrylic acid (0.2 parts), acrylamide (99.8 parts), N' -methylenebisacrylamide (0.05 parts) and water (1000 parts) were added to a reaction vessel, calcium hydroxy phosphate (2 parts) and potassium persulfate (0.05 parts) were added at a stirring speed of 1500rpm, and heated to 55℃for reaction for 3 hours, with continuous stirring; continuously adding methyl methacrylate (12 parts), styrene (7 parts), acrylic acid (1.5 parts) and allyl methacrylate (0.25 parts), sealing the reaction kettle, heating to 120 ℃ for reaction for 30min, and continuously stirring in the reaction process to prepare alkali-soluble water-absorbent resin wrapped by the capsule wall for later use;
(3) 6 parts of the vibrating escaping part and 4 parts of the water-absorbing resin wrapped by the alkali-soluble capsule wall jointly form the bridge deck fluid concrete rapid plasticizing material.
When the concrete pump is used, the vibrating escaping part prepared in the step (1) and the water-absorbent resin wrapped by the alkali-soluble capsule wall prepared in the step (2) are added into the fluid concrete according to the mass ratio of 6:4, and the total addition amount of the two is 2% of the mass of the fluid concrete; stirring for 15min, pumping the obtained fluid concrete, vibrating at 30Hz frequency, and performing conventional curing.
Example 2
Preparation of bridge deck fluid concrete rapid plasticizing material:
(1) Preparation of the vibrating escape part: rosin resin (60 parts), sulfuric acid (5 parts), ethylene glycol (15 parts), pentaerythritol (10 parts) and water (150 parts) are added into a reaction kettle, and the mixture is heated to 85 ℃ under the stirring action to react for 1h; then adding sodium hydroxide (3.5 parts), heating to 95 ℃, continuing to react for 1.5 hours, and cooling to obtain a vibrating escape part for later use;
(2) Preparation of alkali-soluble wall-coated water-absorbent resin: acrylic acid (0.2 parts), acrylamide (99.8 parts), N' -methylenebisacrylamide (0.05 parts) and water (1000 parts) were added to a reaction vessel, calcium hydroxy phosphate (2 parts) and potassium persulfate (0.05 parts) were added at a stirring speed of 1500rpm, and heated to 55℃for reaction for 3 hours, with continuous stirring; continuously adding methyl methacrylate (12 parts), styrene (7 parts), acrylic acid (1.5 parts) and allyl methacrylate (0.25 parts), sealing the reaction kettle, heating to 120 ℃ for reaction for 30min, and continuously stirring in the reaction process to prepare alkali-soluble water-absorbent resin wrapped by the capsule wall for later use;
(3) 8 parts of the vibrating escaping part and 2 parts of the water-absorbing resin wrapped by the alkali-soluble capsule wall jointly form the bridge deck fluid concrete rapid plasticizing material.
When the concrete pump is used, the vibrating escaping part prepared in the step (1) and the water-absorbent resin wrapped by the alkali-soluble capsule wall prepared in the step (2) are added into the fluid concrete according to the mass ratio of 8:2, and the total addition amount of the two is 2% of the mass of the fluid concrete; stirring for 15min, pumping the obtained fluid concrete, vibrating at 30Hz frequency, and performing conventional curing.
The effect verification of the bridge deck fluid concrete rapid plasticizing material prepared in the embodiments 1-2 of the invention:
fluid concrete formulation (per cube): 364kg of PO42.5 ordinary Portland cement, 196kg of secondary fly ash, 187kg of water, 5kg of sulfamate high-efficiency water reducing agent (fluidizer), 717kg of river sand with the fineness modulus of 2.6 and 812kg of graded broken stone.
After the fluid concrete is prepared, the bridge deck fluid concrete rapid plasticizing materials prepared in the examples 1-2 are respectively added, the addition amount is 2% of the mass of the fluid concrete, the mixing is carried out for 15min, and the bridge deck fluid concrete rapid plasticizing materials are not added as a control group.
The slump after completion of mixing and the time required for flowing to 50cm, and the slump after 30Hz frequency vibration for 30s, 90min after vibration and 180min after vibration and the time required for flowing to 50cm were measured for each experimental group, and the measurement results are shown in Table 1; three sets of treated concrete were prepared into concrete test pieces, and after standard curing, the appearance of each set of concrete test pieces was observed, and the compressive strength of each test piece was measured for 3, 7, 28 days, and the results are shown in table 1.
Table 1 results of measuring the properties of fluid concrete in each test group and the surface smoothness after hardening
As can be seen from Table 1, after the bridge deck fluid concrete rapid plasticizing material prepared by the invention is added, the fluidity of the fluid concrete can be improved when the bridge deck fluid concrete rapid plasticizing material is not vibrated, and the fluidity of the bridge deck fluid concrete is obviously reduced after the bridge deck fluid concrete rapid plasticizing material is vibrated; when the bridge deck fluid concrete rapid plasticizing material is placed for 90 minutes, the fluidity of the bridge deck fluid concrete rapid plasticizing material is not greatly changed, and after the bridge deck fluid concrete rapid plasticizing material is placed for 180 minutes, the fluidity of the bridge deck fluid concrete rapid plasticizing material is rapidly reduced because the water-absorbent resin wrapped by the alkali-soluble capsule wall in the added rapid plasticizing material does not release the wrapped water-absorbent resin yet when the bridge deck fluid concrete rapid plasticizing material is placed for 90 minutes, and after 180 minutes, the alkali-soluble capsule wall is dissolved, and the water-absorbent resin plays a role, so that the fluidity of the fluid concrete is rapidly reduced; in addition, after the bridge deck fluid concrete rapid plasticizing material is added, the surface of the fluid concrete after hardening is smooth, and the hardening speed of the fluid concrete can be greatly accelerated.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (5)
1. A bridge deck fluid concrete rapid plasticizing material is characterized by comprising the following components: the vibrating escaping part and the water-absorbing resin wrapped by the alkali-soluble capsule wall; wherein the vibrating escaping part is a substance which generates gas after vibrating;
the mass ratio of the alkali-soluble capsule wall to the water-absorbent resin in the water-absorbent resin wrapped by the alkali-soluble capsule wall is (5-10) (15-30);
the alkali-soluble capsule wall is polymerized by methyl methacrylate, styrene, acrylic acid and allyl methacrylate according to the mass ratio of 48:28:6:1;
the specific preparation steps of the alkali-soluble wall-wrapped water-absorbent resin comprise: adding acrylic acid, acrylamide, N' -methylene bisacrylamide and water into a reaction container, adding a dispersing agent and an initiator under the stirring action of 1000-1500 rpm, heating to 55-60 ℃, and reacting for 3h to obtain water-absorbent resin; adding methyl methacrylate, styrene, acrylic acid and allyl methacrylate, and continuing to react for 30min at 100-120 ℃ to obtain the water-absorbent resin wrapped by the alkali-soluble capsule wall; wherein the mass ratio of the acrylic acid to the acrylamide to the N, N' -methylene bisacrylamide in the water-absorbent resin is 0.2:99.8:0.05;
the vibrating escape part is obtained by reacting rosin resin, sulfuric acid, sodium hydroxide, ethylene glycol and pentaerythritol in water; wherein the mass ratio of the rosin resin, the sulfuric acid, the sodium hydroxide, the ethylene glycol, the pentaerythritol and the water is 60:5:3.5:15:10:150.
2. The bridge deck fluid concrete rapid plasticizing material according to claim 1, wherein the mass ratio of the vibrating escaping portion to the water-absorbent resin wrapped by the alkali-soluble capsule wall is (6-8): (2-4).
3. The bridge deck fluid concrete rapid plasticizing material according to claim 1, wherein the vibrating escaping portion generates gas after vibrating at a frequency of 30-50 hz to escape from the concrete.
4. The bridge deck fluid concrete rapid plasticizing material according to claim 1, wherein the concrete preparation process of the vibrating escape portion is as follows: adding rosin resin, sulfuric acid, ethylene glycol, pentaerythritol and water into a reaction container, heating at 80-85 ℃ for 1-1.5 h, then adding sodium hydroxide, heating to 90-95 ℃ for 1.5-2 h, and cooling to obtain a vibrating escaping part.
5. The use of the fluid concrete rapid plasticizing material for bridge decks according to any one of claims 1 to 4 in paving bridge decks with fluid concrete.
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