CN110256022A - A kind of Expansion Units for Highway Bridges anchorage zone concrete and preparation method thereof - Google Patents
A kind of Expansion Units for Highway Bridges anchorage zone concrete and preparation method thereof Download PDFInfo
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- CN110256022A CN110256022A CN201910689285.7A CN201910689285A CN110256022A CN 110256022 A CN110256022 A CN 110256022A CN 201910689285 A CN201910689285 A CN 201910689285A CN 110256022 A CN110256022 A CN 110256022A
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- parts
- concrete
- water
- expansion units
- anchorage zone
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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
- 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
Abstract
The present invention relates to cement concrete building material technical fields more particularly to a kind of Expansion Units for Highway Bridges anchorage zone concrete and preparation method thereof.Wherein, the formula of concrete is according to mass parts, including 160-170 parts of water, and 410-420 parts of cement, 610-620 parts of sand, 1200-1210 parts of stone, 3-4 parts of water-reducing agent, 11-12 parts of antifreezing agent, 110-120 parts of steel fibre, 1-2 parts of PVA fiber.The invention passes through a large number of experiments, manufacturing process, mix-order, mixing time and the agitating mode of suitable concrete mix and reasonable test test specimen are obtained, the early strength of concrete can effectively be improved, reduce the curing cycle of concrete, to achieve the effect that quickly to be open to traffic.
Description
Technical field
The present invention relates to cement concrete building material technical fields more particularly to a kind of Expansion Units for Highway Bridges to anchor
Area's concrete and preparation method thereof.
Background technique
Building structure is the main skeleton of building, and the material base of structure is construction material.The optimization of building structure
Constantly promote the update and development of construction material with development.Concrete is modern times most widely used construction material, and is worked as
Preceding most artificial material.
Expansion Units for Highway Bridges directly bears repeated stock effect and the temperature shadow of wheel load in bridge structure
It rings, and is chronically exposed in atmosphere, use environment is more severe, is that bridge structure is most subject to destroy and is relatively difficult to repair
Position.Bridge expanssion joint transition region concrete directly bears the Driving Loading and expansion joint conduction when vehicle passes through
Power has very high requirement to expansion joint transition region concrete flexural strength, meanwhile, meeting concrete durability, wearability, resisting
In the case that jelly property etc. requires, compression strength also should not be too low.
Application No. is the files of CN201910241786.9 to disclose such a steel fibre modified PVA fiber reinforcement water
Cement-based composite material and preparation method thereof, including following components: 450~650 parts of sulphate aluminium cement, 190~300 parts of water, sand
440~810 parts, 500~830 parts of rubble, 85~1500 parts of ground slag, 40~65 parts of flyash, 3~6 parts of PVA fiber, steel
70~110 parts of fiber, 2~5 parts of high efficiency water reducing agent, 0~2 part of early strength agent.It is multiple by sulphate aluminium cement cooperation in this document
The use of early strength agent is closed, early strength of concrete is improved, and wherein steel fibre and PVA fiber are only that collective effect is mixed to improve
Coagulate ductility, toughness and the impermeability of soil.It must be mentioned with sulphate aluminium cement and early strength agent with the use of can be only achieved
The effect of high early strength, narrow application range.And sulphate aluminium cement still non-mainstream cement type at present, manufacturer is few, makes
Valence is high, the problem of so as to cause increased costs.
Summary of the invention
The invention solves the above problem, provide that one kind can be improved early strength and low-cost highway bridge is stretched
The formula and preparation method thereof of compression apparatus anchorage zone concrete.
The technical solution that the present invention solves the problems, such as is to provide a kind of Expansion Units for Highway Bridges anchorage zone concrete, presses
According to mass parts, including 160-170 parts of water, 410-420 parts of cement, 610-620 parts of sand, 1200-1210 parts of stone, 3-4 parts of water-reducing agent,
110-120 parts of steel fibre, 1-2 parts of PVA fiber.
Preferably, according to mass parts, including 165.75 parts of water, 414.38 parts of cement, 618.79 parts of sand, 1201.08 parts of stone,
3.108 parts of water-reducing agent, 117 parts of steel fibre, 1.09 parts of PVA fiber.
Preferably, the cement is PI52.5 cement.
It preferably, further include 11-12 parts of antifreezing agent according to mass parts.
It preferably, further include 11.28 parts of antifreezing agent according to mass parts.
It is a further object to provide a kind of preparation method of Expansion Units for Highway Bridges anchorage zone concrete,
The following steps are included:
(1) material is weighed according to mass parts；
(2) sand, stone, steel fibre, PVA fiber are mixed and stirred for uniformly；Then sequentially add cement mixing uniformly, be added water stir
It mixes uniform, addition water-reducing agent and is uniformly mixing to obtain mixture, mixture is poured to obtain concrete block.
Preferably, after water being added, 1.5-2.5min is stirred.
Preferably, after water-reducing agent being added, 0.5-1.5min is stirred.
Preferably, in step (2), pouring procedure are as follows:
A. a semifused is poured in die trial, is subsequently placed in shake table vibration 20-40s；
B. it pours remaining mixture and vibrates 20-40s, in shake table vibration pay attention to that die trial cannot be allowed arbitrarily to beat on platform,
Until being vibrated to surface pulp；
C. demoulding, maintenance.
Preferably, maintenance room temperature is 20 ± 2 DEG C, and relative humidity is 95% or more, and indoor humidity is uniform.
Beneficial effects of the present invention:
1. being obtained most by probing into different assorted fibre volumes to the affecting laws of concrete early mechanics characteristics and frost resistance
Excellent assorted fibre combination, provides test basis in bridge extension joint application for hybrid fiber concrete.
2. the doping of PVA fiber and steel fibre combination is selected, it is respective according to vinal (PVA) and steel fibre (SF)
Characteristic polyvinyl alcohol and steel fibre are added in concrete form steel-steel-polypropylene hybrid fiber concrete, but pass through research point
Analysis show that assorted fibre is only incorporated into concrete according to a certain percentage, and the raising of concrete basic mechanical performance can just reached
To best.Therefore the optimal proportion that polyvinyl alcohol volume and volume content of steel fibers are also determined by a large number of experiments, so that both are fine
Positive confounding effect is presented in concrete in two kinds of combinations of dimension, compression strength and the anti-folding for effectively improving concrete are strong
Degree, the curing cycle for reducing concrete, to achieve the effect that quickly to be open to traffic.
3. during the preparation process, by the way of shaking casting in batches, so that the biggish fiber of volume is uniform as much as possible
It is distributed in concrete material, prevents the reduction of the tension resistance performance of concrete caused by the raw clustering phenomena of fiber.
4. by a large number of experiments, obtained suitable concrete mix and reasonable test test specimen manufacturing process,
Mix-order, mixing time and agitating mode.
Specific embodiment
It is a specific embodiment of the invention below, and technical scheme of the present invention will be further described, but this hair
It is bright to be not limited to these examples.
Embodiment 1
A kind of Expansion Units for Highway Bridges anchorage zone concrete, according to mass parts, including 165.75 parts of water, PI52.5 cement
414.38 parts, 618.79 parts of sand, 1201.08 parts of stone, 3.108 parts of water-reducing agent, 11.28 parts of antifreezing agent, 117 parts of steel fibre, PVA is fine
1.09 parts of dimension.
The preparation method of this Expansion Units for Highway Bridges anchorage zone concrete, comprising the following steps:
(1) material is weighed according to mass parts；
(2) sand, stone, antifreezing agent, steel fibre, PVA fiber are mixed and stirred for uniformly；Then sequentially add cement mixing uniformly,
Water stirring 2min is added, water-reducing agent stirring 1min is added, casting obtains concrete block after the completion of preparation.Wherein, pouring procedure are as follows:
A. half concrete is poured in die trial, is subsequently placed in shake table vibration 30s；B. it pours residual concrete and vibrates 30s, shaking
Pay attention to die trial cannot being allowed arbitrarily to beat on platform when dynamic platform vibration, until being vibrated to surface pulp；C. demoulding, maintenance, fog room
Temperature is 20 DEG C, and relative humidity 97%, indoor humidity is uniform.
Embodiment 2
A kind of Expansion Units for Highway Bridges anchorage zone concrete, according to mass parts, including 160 parts of water, PI52.5 cement 410
Part, 610 parts of sand, 1200 parts of stone, 30 parts of water-reducing agent, 110 parts of antifreezing agent, 110 parts of steel fibre, 1 part of PVA fiber.
The preparation method of this Expansion Units for Highway Bridges anchorage zone concrete, comprising the following steps:
(1) material is weighed according to mass parts；
(2) sand, stone, antifreezing agent, steel fibre, PVA fiber are mixed and stirred for uniformly；Then sequentially add cement mixing uniformly,
Water stirring 1.5min is added, water-reducing agent stirring 0.5min is added, casting obtains concrete block after the completion of preparation.Wherein, casting side
Method are as follows: a. pours half concrete in die trial, is subsequently placed in shake table vibration 20s；B. it pours residual concrete and vibrates
20s in shake table vibration pays attention to that die trial cannot be allowed arbitrarily to beat on platform, until being vibrated to surface pulp；C. demoulding is supported
Shield, maintenance room temperature are 18 DEG C, and relative humidity 95%, indoor humidity is uniform.
Embodiment 3
A kind of Expansion Units for Highway Bridges anchorage zone concrete, according to mass parts, including 170 parts of water, PI52.5 cement 420
Part, 620 parts of sand, 1210 parts of stone, 4 parts of water-reducing agent, 12 parts of antifreezing agent, 120 parts of steel fibre, 2 parts of PVA fiber.
The preparation method of this Expansion Units for Highway Bridges anchorage zone concrete, comprising the following steps:
(1) material is weighed according to mass parts；
(2) sand, stone, antifreezing agent, steel fibre, PVA fiber are mixed and stirred for uniformly；Then sequentially add cement mixing uniformly,
Water stirring 2.2min is added, water-reducing agent stirring 1.5min is added, casting obtains concrete block after the completion of preparation.Wherein, casting side
Method are as follows: a. pours half concrete in die trial, is subsequently placed in shake table vibration 40s；B. it pours residual concrete and vibrates
40s in shake table vibration pays attention to that die trial cannot be allowed arbitrarily to beat on platform, until being vibrated to surface pulp；C. demoulding is supported
Shield, maintenance room temperature are 22 DEG C, and relative humidity 99%, indoor humidity is uniform.
Comparative example 1
According to mass parts, 165.75 parts of water are weighed, 414.38 parts of PI52.5 cement, 618.79 parts of sand, 1201.08 parts of stone, diminishing
3.108 parts of agent, 11.28 parts of antifreezing agent.And concrete is prepared according to the preparation step in embodiment 1.
Comparative example 2
According to mass parts, 165.75 parts of water are weighed, 414.38 parts of PI52.5 cement, 618.79 parts of sand, 1201.08 parts of stone, diminishing
3.108 parts of agent, 11.28 parts of antifreezing agent, 118.09 parts of steel fibre.And coagulation is prepared according to the preparation step in embodiment 1
Soil.
Comparative example 3
According to mass parts, 165.75 parts of water are weighed, 414.38 parts of PI52.5 cement, 618.79 parts of sand, 1201.08 parts of stone, diminishing
3.108 parts of agent, 11.28 parts of antifreezing agent, 118.09 parts of PVA fiber.And it is prepared according to the preparation step in embodiment 1 mixed
Solidifying soil.
Embodiment 1,2,3 and comparative example 1,2,3 are carried out to compressive strength test and flexural strength examination under identical environment
It tests.
Wherein, compressive strength test step: according to " normal concrete mechanical property test standard " (GB/T 50081)
Relevant regulations system is tested.Defined age take out concrete test block, by test block wiped clean, and check its appearance whether there is or not
Defect.Test block is placed on to the centre of pressing plate when test, selects the face vertical with the face that pours as pressure-bearing surface, opens testing machine, when
Top board drops to i.e. stopping when into contact with test block, closes oil return valve, opening send oil valve, and keeps 0.5-0.8MPa/s's
Speed at the uniform velocity loads, and until test block destroys, oil valve is sent in opening oil return valve, closing, records test data.Experimental result such as the following table 1.
Table 1
Test proves that after mixing the steel fibre mixed and PVA fiber into plain concrete, the compression strength of concrete has significantly
Improve.
Bending test step: test specimen is placed on to the center for being bent anti-device for folding, using shiny surface as pressure-bearing surface.Start test
Machine, with the continuously equably loading of the speed of 0.8-1.0Mpa each second.It is strong to calculate anti-folding for payload values when being destroyed according to test specimen
Degree, concrete outcome such as the following table 2.
Table 2
Test proves that after mixing the steel fibre mixed and PVA fiber into plain concrete, the flexural strength of concrete has significantly
Improve.
From upper test result it can be seen that vinal, steel fibre and its assorted fibre are to morning of original concrete
Phase compression strength and flexural strength improve a lot.
This is because the compatibility of polyvinyl alcohol and cement is good, polyvinyl alcohol and cement are mainly passed through to the toughening of matrix
Between mutual cohesive force and generate.The microcrack and cracking that vinal can inhibit concrete inner structure are just
The extension in phase crack, when crack is slowly expanded, fiber stress, which causes inside concrete to generate deformation, can be absorbed crack release
Energy, postpone cracking time so that improve matrix deformability.And vinal is that hydrophily is good again
Fiber, moisture can be firmly sucked by fiber, and moisture is difficult evaporation and is detached from, and play a key effect during concrete curing.?
Under certain environment, the water evaporation quantity of vinal concrete is compared with decrease to some degree for plain concrete.Cause
This, when hydrated cementitious can generate a large amount of hydrated product and table of many attachment of moisture in vinal of aquation does not occur
Face, these substances will disconnect when heaping to a certain extent can be with the minim channel of evaporation water, to prevent the plasticity of concrete
The intensity of concrete is improved in crack.
So polyvinyl alcohol and steel fibre can not mutually replace the effect that concrete substrate enhances.Generally speaking when mixed
Solidifying soil will destroy, and polyvinyl alcohol and steel fibre will generate the effect reinforced to concrete, either in small crack or big
In the case where crack, it can all play the role of a kind of reinforcement.The intensity of concrete is generally improved, is very in practical projects
Significant, there is stronger application value.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of Expansion Units for Highway Bridges anchorage zone concrete, it is characterised in that: according to mass parts, including water 160-170
Part, 410-420 parts of cement, 610-620 parts of sand, 1200-1210 parts of stone, 3-4 parts of water-reducing agent, 110-120 parts of steel fibre, PVA is fine
1-2 parts of dimension.
2. a kind of Expansion Units for Highway Bridges anchorage zone concrete according to claim 1, it is characterised in that: according to matter
Amount part, including 165.75 parts of water, 414.38 parts of cement, 618.79 parts of sand, 1201.08 parts of stone, 3.108 parts of water-reducing agent, steel fibre
117 parts, 1.09 parts of PVA fiber.
3. a kind of Expansion Units for Highway Bridges anchorage zone concrete according to claim 1, it is characterised in that: the water
Mud is PI52.5 cement.
4. a kind of Expansion Units for Highway Bridges anchorage zone concrete according to claim 1, it is characterised in that: according to matter
Part is measured, further includes 11-12 parts of antifreezing agent.
5. a kind of Expansion Units for Highway Bridges anchorage zone concrete according to claim 4, it is characterised in that: according to matter
Part is measured, further includes 11.28 parts of antifreezing agent.
6. a kind of preparation side of Expansion Units for Highway Bridges anchorage zone concrete described in -5 any one according to claim 1
Method, it is characterised in that: the following steps are included:
(1) material is weighed according to mass parts；
(2) sand, stone, steel fibre, PVA fiber are mixed and stirred for uniformly；Then sequentially add cement mixing uniformly, be added water stir
It mixes uniform, addition water-reducing agent and is uniformly mixing to obtain mixture, mixture is poured to obtain concrete block.
7. a kind of preparation method of Expansion Units for Highway Bridges anchorage zone concrete according to claim 6, feature
It is: after water is added, stirs 1.5-2.5min.
8. a kind of preparation method of Expansion Units for Highway Bridges anchorage zone concrete according to claim 6, feature
It is: after water-reducing agent is added, stirs 0.5-1.5min.
9. a kind of preparation method of Expansion Units for Highway Bridges anchorage zone concrete according to claim 6, feature
It is: in step (2), pouring procedure are as follows:
A semifused is poured in die trial, is subsequently placed in shake table vibration 20-40s；
It pours remaining mixture and vibrates 20-40s, in shake table vibration pay attention to that die trial cannot be allowed arbitrarily to beat on platform, shake
It moves until the pulp of surface；
Demoulding, maintenance.
10. a kind of preparation method of Expansion Units for Highway Bridges anchorage zone concrete according to claim 9, feature
Be: maintenance room temperature is 20 ± 2 DEG C, and relative humidity is 95% or more, and indoor humidity is uniform.
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| CN201910689285.7A CN110256022A (en) | 2019-07-29 | 2019-07-29 | A kind of Expansion Units for Highway Bridges anchorage zone concrete and preparation method thereof |
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| CN201910689285.7A CN110256022A (en) | 2019-07-29 | 2019-07-29 | A kind of Expansion Units for Highway Bridges anchorage zone concrete and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070028808A1 (en) * | 2002-08-23 | 2007-02-08 | Bki Holding Corporation | Cementitious material reinforced with chemically treated cellulose fiber |
| KR20150142416A (en) * | 2014-06-12 | 2015-12-22 | 경일대학교산학협력단 | Reinforcing metal fiber and pva fiber concrete and manufactuaring method thereof, repair process of pavement using the same thing |
| CN105585294A (en) * | 2015-11-13 | 2016-05-18 | 北京中企卓创科技发展有限公司 | Hybrid fiber high-crack-resisting and high-tenacity airfield pavement concrete and preparation method thereof |
| CN108017347A (en) * | 2017-12-12 | 2018-05-11 | 大连理创科技有限公司 | A kind of preparation process of lightweight concrete |
-
2019
- 2019-07-29 CN CN201910689285.7A patent/CN110256022A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070028808A1 (en) * | 2002-08-23 | 2007-02-08 | Bki Holding Corporation | Cementitious material reinforced with chemically treated cellulose fiber |
| KR20150142416A (en) * | 2014-06-12 | 2015-12-22 | 경일대학교산학협력단 | Reinforcing metal fiber and pva fiber concrete and manufactuaring method thereof, repair process of pavement using the same thing |
| CN105585294A (en) * | 2015-11-13 | 2016-05-18 | 北京中企卓创科技发展有限公司 | Hybrid fiber high-crack-resisting and high-tenacity airfield pavement concrete and preparation method thereof |
| CN108017347A (en) * | 2017-12-12 | 2018-05-11 | 大连理创科技有限公司 | A kind of preparation process of lightweight concrete |
Non-Patent Citations (1)
| Title |
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| 李书进,钱红萍,徐铮澄: "纤维自密实混凝土早期收缩及阻裂特性研究", 《硅酸盐通报》 * |
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Application publication date: 20190920 |