CN104129949B - A kind of matrix for GFRP reinforced concrete Crack Control and making method thereof - Google Patents
A kind of matrix for GFRP reinforced concrete Crack Control and making method thereof Download PDFInfo
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- CN104129949B CN104129949B CN201410361216.0A CN201410361216A CN104129949B CN 104129949 B CN104129949 B CN 104129949B CN 201410361216 A CN201410361216 A CN 201410361216A CN 104129949 B CN104129949 B CN 104129949B
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Abstract
The present invention relates to a kind of matrix for GFRP reinforced concrete Crack Control, it forms and weight proportion is: cement 15% ~ 30%, water 5% ~ 15%, flyash 5% ~ 15%, sand 20% ~ 40%, stone 15% ~ 30%, water reducer 0.1% ~ 1% and modified polypropylene monofilaments fiber 0.23% ~ 0.6%. Also disclose the making method of a kind of matrix for GFRP reinforced concrete Crack Control, adopt fiber first to mix method, comprise the following steps: proportioning by weight is than weighing required cement, flyash, sand, coarse aggregate, water reducer and fiber; Sand and coarse aggregate are added stirrer, starts stirrer, stir 1-2 minute; Adding cement and flyash again, stir after 1-2 minute, limit is stirred, and limit manually adds fiber, and fiber is uniformly distributed; After adding fiber, then stir 6 minutes, make fiber dispersion even; Water reducer is added to the water, agitation as appropriate, slowly adds water in agitation vat, after after water injection, then stir 3-5 minute. The matrix that the present invention makes have good workability, sticky poly-property, water-retentivity, can application property good.
Description
Technical field
The invention belongs to the technical field of reinforced concrete Crack Control, in particular to a kind of matrix for GFRP reinforced concrete Crack Control and making method thereof.
Background technology
FRP muscle is as a kind of muscle material comparatively ripe after deliberation, but domestic is never promoted the use of widely in some covil construction, public building. But FRP muscle has light weight, tensile strength height, anticorrosive, antifatigue and without the need to regular maintenance, good weather resistance and the advantage such as reliability, electromagnetism interference. But due to GFRP elasticity modulus of materials only about 40GPa, so GFRP tendon concrete structure is wide by power cracking crack, it is difficult to meets current specifications requirement, seriously hinders the popularization of this technology in concrete arrangement of reinforcement application aspect. But, adding fiber at concrete has good effect to delaying concrete structure cracking and improve toughness of concrete. In the world, usually preparation ECC material improves the toughness of body material, ECC is normally using cement, flyash, quartz sand as matrix, strongthener is done with external additive and fiber, when fiber volume volume is less than 2%, its ultimate tensile strength is usually in the scope of 3% ~ 7%, but on promoting, existing problems are that cost performance is too low, can only use in some special building things. More cheap than ECC material every cube 300 to 500 yuan of the fibrous concrete prepared by the present invention, can effectively control again GFRP reinforced concrete crack developing, therefore, research GFRP fibrous concrete structure, for promoting the application of GFRP material and bridge construction, port and pier construction in future are had huge meaning. Domestic GFRP tendon concrete structure is studied, high pellet in 2000 people such as is full of by 62 GFRP reinforced concrete beams and reinforced beam being contrasted, show that the ratio of reinforcement is limited on the impact of GFRP cracking resistance bearing capacity, but anti-bending bearing capacity increases along with the increase of the ratio of reinforcement within the scope of arrangement of reinforcement, and establish the method for calculation of ring cross-section and anti-bending bearing capacity. Within 2007, father-in-law's spring scenery is by the contrast of 5 GFRP beams and 1 reinforced beam, has shown that the design of GFRP beams of concrete is general by the control allowing fracture width and amount of deflection, it is proposed that GFRP reinforced concrete beam cracking bemding moment formula. In formula is derived, beam is found out homogeneous mass, and GFRP muscle Young's modulus is about concrete twice, it is assumed that unreasonable. Within 2011, Zhou Jikai, Wang Hailing establish the mechanical characteristic of GFRP reinforced concrete component in " GFRP reinforced concrete flexure member method of design experimental study " article, 1) GFRP reinforced concrete flexure member flexure has obvious omen before destroying, as big in amount of deflection, crack width etc., show good ductility in suitable muscle arrangement of reinforcement destructive process. 2) calculation formula of GFRP reinforced concrete flexure member normal section bearing capacity, crack width equation, Calculation of Deflection formula and utility design method is established, suggestion general using limit state, using deflection value as control criterion, provides reference for setting up design discipline from now on. 3) point out to adopt area etc. to be safety for method design GFRP reinforced concrete flexure member Bearing Capacity of Normal Section, efficiently, give checking computations when not meeting general using limit state and relax standard. 4) join hoop rate, cut across being the principal element affecting GFRP reinforced concrete oblique section of banding concrete member shear-carrying capacity than, ripping circular saw, join hoop rate bearing capacity impact is maximum, cut across than affect its collapse mode, shear-carrying capacity along with cut across than increase reduction. 5) calculation formula of GFRP reinforced concrete oblique section of banding concrete member bearing capacity, fracture width, cracking load is established. 6) carry out GFRP tendon concrete structure construction technology to inquire into, indicated on-the-spot bending process factor of attention, summarize the on-the-spot lap length design variable of the straight muscle of GFRP muscle, the anchorage length bending muscle and GFRP muscle.In prior art for research GERP reinforced concrete crack Control Measures research be not a lot.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is provided that a kind of matrix and its preparation method that the crack of GERP reinforced concrete can be accomplished control very well.
For achieving the above object, present invention employs following technical scheme: provide a kind of matrix for GFRP reinforced concrete Crack Control, it forms and weight proportion is: cement 15% ~ 30%, water 5% ~ 15%, flyash 5% ~ 15%, sand 20% ~ 40%, coarse aggregate 15% ~ 30%, water reducer 0.1% ~ 1% and modified polypropylene monofilaments fiber 0.23% ~ 0.6%.
Further, also comprising coarse aggregate, described coarse aggregate is continuous continuous grading, and particle size range is 5 ~ 16mm, and every cube of concrete coarse aggregate volume is no more than 560kg.
Further, described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid.
Further, described cement and flyash are gelling material, and the mass values of described water and gelling material is 0.2 ~ 0.4.
Further, the composition of described matrix and weight proportion are: cement 20.57%, water 11.75%, flyash 8.81%, sand 34.72%, coarse aggregate 23.11%, water reducer 0.48%, modified polypropylene monofilaments fiber 0.56%.
The making method of a kind of matrix for GFRP reinforced concrete Crack Control provided by the invention, adopts fiber first to mix method, comprises the following steps:
Step one, proportioning by weight are than weighing required cement, flyash, sand, coarse aggregate, water reducer and fiber;
Step 2, sand and coarse aggregate are added stirrer, start stirrer, stir 1-2 minute; Adding cement and flyash again, stir after 1-2 minute, limit is stirred, and limit manually adds fiber, and fiber is uniformly distributed; After adding fiber, then stir 6 minutes, make fiber dispersion even;
Step 3, water reducer is added to the water, agitation as appropriate, slowly adds water in agitation vat, after after water injection, then stir 3-5 minute.
The useful effect of the present invention:
1, for the Crack Control of GFRP reinforced concrete beam provides a solution, simultaneously for the popularization of GFRP muscle in bridge construction, port and pier engineering serves certain effect.
2, raw material be easy to get, cost lower.
Polypropylene fibre market is comparatively ripe, just can buy at home, and price is relatively low. The matrix composition that the present invention adopts has stone, and at raising toughness of concrete, under the prerequisite of control critical eigenvalue, relative ECC, cost greatly reduces.
3, processing environment and operational requirement is lower.
Carrying out the preparation of GFRP reinforced concrete material matrix prepares environment facies together with common concrete, constructability.
4, the matrix made by the present invention have good workability, sticky poly-property, water-retentivity, can application property good.
GFRP reinforced concrete material is had good cracking resistance, limit to split effect, and have good toughness by the matrix that 5, the present invention makes.
Accompanying drawing explanation
Fig. 1 is the bending resistance experiment crack, positive cross section of GFRP muscle normal concrete beams and the relation curve figure of load;
Fig. 2 is bending resistance experiment crack, positive cross section and the load graph of a relation of GFRP muscle fiber-reinforced concrete beam;
Method schema first mixed by the fiber that Fig. 3 is the present invention;
Fig. 4 is the GFRP muscle fibrous concrete crack progressing figure of the present invention.
Embodiment
For making the object of the embodiment of the present invention and technical scheme clearly, below in conjunction with the accompanying drawing of the embodiment of the present invention, the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments. Based on described embodiments of the invention, other embodiments all that those of ordinary skill in the art obtain under without the need to the prerequisite of creative work, all belong to the scope of protection of the invention.
It can be appreciated that unless otherwise defined, all terms used herein (comprise technical term and scientific terminology) and have the meaning identical with the general understanding of the those of ordinary skill in art of the present invention those skilled in the art of the present technique. It should be further understood that those terms of definition should be understood to have the meaning consistent with the meaning in the context of prior art in such as general dictionary, and unless defined as here, can not explain by idealized or too formal implication.
The implication of the "and/or" described in the present invention refers to that respective Individual existence or the situation that both exist simultaneously include interior.
The implication of " inside and outside " described in the present invention refers to for equipment itself, in the direction pointing to device interior is, otherwise is outward, but not the specific restriction of the equipment mechanism to the present invention.
When the implication of " left and right " described in the present invention refers to reader just to accompanying drawing, the left side of reader is a left side, and the right of reader is the right side, but not the specific restriction of the equipment mechanism to the present invention.
The implication of " connection " described in the present invention can be the direct connection between parts can also be by the indirect connection of other parts between parts.
Can find out by Fig. 1, Fig. 2 and prepare, by the present invention, the effect that GFRP muscle fibrous concrete serves good control crack progressing; Fig. 4 is the crack progressing figure that the GFRP muscle fiber-reinforced concrete beam made by the best matrix proportioning of the present invention does flexure experiment, and its crack is thin and close as seen from the figure, effectively raises the toughness of beam, and crack is effectively controlled.
The matrix proportioning for GFRP reinforced concrete Crack Control of the present invention and the matrix of making method thereof form and weight proportion: cement 15% ~ 30%, water 5% ~ 15%, flyash 5% ~ 15%, sand 20% ~ 40%, coarse aggregate 15% ~ 30%, water reducer 0.1% ~ 1%, modified polypropylene monofilaments fiber 0.23% ~ 0.6%.
Water reducer is high-efficiency water-reducing agent of poly-carboxylic acid.
During matrix of the present invention forms, coarse aggregate is continuous grading, and particle size range is 5 ~ 16mm, and every cube of concrete volume is no more than 560kg.
During matrix of the present invention forms, the optimal volume volume of modified polypropylene monofilaments fiber is 0.7% ~ 1.2%.
As shown in Figure 3, the matrix preparation process of a kind of special matrix proportioning in GFRP reinforced concrete Crack Control of the present invention and making method thereof, adopts and first mixes fibre method, and concrete steps are:
Steps A, weigh required cement, flyash, sand, coarse aggregate, water reducer, fiber by GFRP reinforced concrete matrix mixing ratio by weight.
Step B, the sand that weight proportion is followed successively by 34.72%, 23.11%, coarse aggregate add stirrer, start stirrer, stir 1 ~ 2 minute, add cement, flyash that weight proportion is respectively 11.75%, 8.81% again, stirring after 1 ~ 2 minute, limit is stirred, and limit manually adds the fiber that weight proportion is 0.56% to the inside, enable fiber be uniformly distributed as far as possible, after adding fiber, then dry mixing 6 minutes, fiber is uniformly dispersed, if amount of agitation is relatively big, suitably add long-time.
Step C, the water reducer by weight proportion being 0.48% add in the water that weight proportion is 11.75%, and agitation as appropriate, slowly adds water in agitation vat, after after water injection, then stirs 3 ~ 5 minutes.
We, by being combined with GFRP muscle by fibrous concrete, utilize the high tenacity of fibrous concrete, play cracking resistance, limit the effect split. Resistance to cleavage and the fibers content of fibrous concrete have relation, and the present invention will provide the optimum fiber contents scope of GFRP reinforced concrete matrix. The present invention is mixed with coarse aggregate in the base, thus reduces cost, but needs the particle size range and the every cube of maximum doping quantity that control coarse aggregate continuous grading, and the present invention also will provide.
The present invention is by the improvement of GFRP concrete substrate proportioning and the adjustment of its preparation method, workability, sticky poly-property and water-retentivity that matrix has had can be made, can effectively develop by control critical eigenvalue again, and it is cheap, thus there is reliably application property, also the cracking resistance, the limit that effectively improve GFRP reinforced concrete material split ability, taking general using limit state as standard, for the popularization of GFRP reinforced concrete material has very big meaning.
Cement used in the present invention, flyash and sand are in building materials market and available; The water reducer of the present invention is common industrial chemicals, commercially namely available; What polypropylene fibre used in the present invention adopted is spin fibre in Beijing to build modified polypropylene monofilaments fiber, also commercially available; The GFRP muscle that the present invention adopts is simple glass fiber muscle, commercially namely available.
These are only embodiments of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to patent scope of the present invention. , it is also possible to make some distortion and improvement, it should be appreciated that for the person of ordinary skill of the art, without departing from the inventive concept of the premise these all belong to protection scope of the present invention.
Claims (1)
1. the matrix for GFRP reinforced concrete Crack Control, it is characterized in that, the composition of described matrix and weight proportion be: cement 20.57%, water 11.75%, flyash 8.81%, sand 34.72%, coarse aggregate 23.11%, water reducer 0.48%, modified polypropylene monofilaments fiber 0.56%.
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| CN201410361216.0A CN104129949B (en) | 2014-07-28 | 2014-07-28 | A kind of matrix for GFRP reinforced concrete Crack Control and making method thereof |
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| CN104129949B true CN104129949B (en) | 2016-06-01 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104478330A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Formula of high-strength composite reinforced concrete |
| CN104529278A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | New formula of composite reinforced concrete |
| CN104529276A (en) * | 2014-12-13 | 2015-04-22 | 广西科技大学 | Novel formula of partial reinforcement CFRP-PCPs composite bar concrete |
| CN107021685A (en) * | 2017-05-22 | 2017-08-08 | 山东交通学院 | A kind of concrete for building a bridge |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103508705A (en) * | 2013-08-30 | 2014-01-15 | 江南大学 | Ejection type ductile PP fiber strengthened cement base composite material and preparation method thereof |
| CN103938803A (en) * | 2014-04-04 | 2014-07-23 | 浙江大学 | High toughness cement-based material-nonmetal fiber rib composite structure as well as application and application method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103508705A (en) * | 2013-08-30 | 2014-01-15 | 江南大学 | Ejection type ductile PP fiber strengthened cement base composite material and preparation method thereof |
| CN103938803A (en) * | 2014-04-04 | 2014-07-23 | 浙江大学 | High toughness cement-based material-nonmetal fiber rib composite structure as well as application and application method thereof |
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Inventor after: Zhou Jikai Inventor after: Shen Chao Inventor after: Yue Qingying Inventor after: Xu Feifei Inventor after: Li Chengqiang Inventor after: Lin Zhongyang Inventor after: Wei Wei Inventor after: Liang Kai Inventor after: Huang Junkai Inventor after: Bi Fengtong Inventor before: Zhou Jikai Inventor before: Yue Qingying Inventor before: Xu Feifei Inventor before: Li Chengqiang Inventor before: Lin Zhongyang Inventor before: Wei Wei Inventor before: Liang Kai Inventor before: Shen Chao |
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Granted publication date: 20160601 Termination date: 20210728 |