CN104563389A - High-strength reinforced and functionally-graded concrete beam - Google Patents
High-strength reinforced and functionally-graded concrete beam Download PDFInfo
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- CN104563389A CN104563389A CN201410797852.8A CN201410797852A CN104563389A CN 104563389 A CN104563389 A CN 104563389A CN 201410797852 A CN201410797852 A CN 201410797852A CN 104563389 A CN104563389 A CN 104563389A
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Abstract
The invention relates to a structure of a building member and a material, particularly relates to a high-strength reinforced and functionally-graded concrete beam and belongs to the technical field of building materials. The high-strength reinforced and functionally-graded concrete beam is mainly characterized in that common concrete and a high-toughness fiber-enhanced cement-based composite material are combined in a layering manner; the common concrete is adopted for the pressed area of the concrete beam; the high-toughness fiber-enhanced cement-based composite material is cast in a pulled area in the whole longitudinal-length range of the beam or the specific beam section; and interface-area treatment is adopted for a combined area of the common concrete and the high-toughness fiber-enhanced cement-based composite material. The high-strength reinforced and functionally-graded concrete beam has the advantages that uniform transition of the material system on performance is realized, discontinuous weak areas on the interface are eliminated, the bearing capability of the structure is effectively improved and the completeness and the stability of the whole structure are ensured.
Description
Technical field
The present invention relates to a kind of structure and material of building slab, particularly relate to a kind of High Strength Steel Bar functionally gradient beams of concrete, belong to building material technical field.
Background technology
The weather resistance of concrete structure is the worldwide Important Project technical problem that current field of civil engineering faces, and has ubiquity and science, and is closely connected with Sustainable development with national economy.According to statistics, only at 1999 1 year, the financial loss that China causes because of structure deterioration is just up to 1,800 hundred million ~ 3,600 hundred million yuan.Skeleton construction performance degradation is caused by concrete deterioration and reinforcing bar deterioration, and the deterioration of these two aspects is all relevant with concrete cracking.Existing large quantifier elimination shows, the corrosion ratio of reinforcing bar is relevant with the speed that moisture and other objectionable impuritiess penetrate in concrete member.In same envrionment conditions with under identical protective layer thickness, fracture width is larger, then reinforcing bar is more easy to corrosion.Therefore, in actual the Concrete Structure Design, the control of fracture width is the key of dealing with problems.
As everyone knows, adopt the structure design of the high ratio of reinforcement, not only need to drop into a large amount of manpowers and time, and be unfavorable for the quality ensureing concrete placement, thus more loose concrete may be caused, add concrete perviousness on the contrary.In recent years, along with High Strength Steel Bar applying in civil engineering work, under normal service condition, reinforcement stresses is higher, may need to add and join steel bar stress control critical eigenvalue, so just can not give full play to the strength efficiency of High Strength Steel Bar.When particularly increasing the thickness of concrete cover of component under endurance quality impact, the fracture width of component will increase further, and Crack Control problem is then more outstanding.
The modified concrete of research low-permeability, adopts fiber reinforcement technology to be a kind of effective and feasible method.Fibrous concrete material is widely used in recent years, and achieves good effect.But, these fibrous concretes still cannot the expansion of control critical eigenvalue width effectively under heavy load effect, under uniaxial direct tensile loading action, still show strain softening characteristic, displaying higher than toughness of concrete while, often with wider harmful cracks for cost.Therefore, researchist has done further research and development to high performance fibre cement based composites, such as, public Cheng Xu, Mr. Zhang describe the proportioning of high tenacity polyethylene alcohol fiber (PVA) refinforced cement based composites, preparation process and tensile mechanical properties in document " tensile property of high-tenacity fiber refinforced cement based composites "; Yu Jiahuan, Victor Li describes the preparation technology of polyvinyl alcohol fiber reinforced cement based composites in detail in document " Research on production, performance and fibredispersion of PVA engineeringcementitious composites ".Although the polyvinyl alcohol fiber reinforced cement based composites provided in above-mentioned preparation scheme is obtained for strain hardening phenomenon and compound cracking effect, but because the polyvinyl alcohol fiber adopting Japanese Kurrary company to produce is expensive, cause the cost of finished product higher, be difficult to realize engineer applied.
Concerning common concrete is subject to camber beam, the cracking of concrete in tension zone accelerates the corrosion of reinforcing bar, then causes the further cracking of concrete cover and peels off.
In recent years; the application of Functionally Graded Materials in cement concrete material field more and more causes the attention of numerous investigators, and such as Xu generation Lang, Li Qinghua has carried out experimental study to the RC Short Beams with superhigh tenacity cement-base composite material (UHTCC) protective layer in document " theoretical investigation of functionally gradient composite beam bending property is split in the control of superhigh tenacity matrix material ".But the polyvinyl alcohol fiber that superhigh tenacity cement-base composite material used in this article have employed the production of Japanese Kurrary company is prepared from.And, test-results shows, although the reinforcing bar configured in above-mentioned reinforced beam is only HRB335 level reinforcing bar, still has when limiting damage part test specimen, at crack root, local stratum boundary unsticking will occur, UHTCC layer and concrete layer but can not be caused seriously to peel off.
Summary of the invention
The present invention is directed to the control of crack width problem run in High Strength Steel Bar extension process, and the crack resistance that normal concrete exists is poor, limit elongation is little etc. shortcoming, a kind of High Strength Steel Bar functionally gradient beams of concrete is provided, is intended to solve and how makes the beams of concrete of configuration High Strength Steel Bar while making full use of High Strength Steel Bar strength advantage, control its fracture width under serviceability limit state to meet the problem of life requirement.
In order to realize above-mentioned purpose of the present invention, technical scheme of the present invention is as follows: a kind of High Strength Steel Bar functionally gradient beams of concrete, comprise normal concrete 1, high-tenacity fiber refinforced cement based composites 2 and the High Strength Steel Bar 3 be arranged in normal concrete 1 or high-tenacity fiber refinforced cement based composites 2, it is characterized in that, described normal concrete 1, high-tenacity fiber refinforced cement based composites 2 layered combination, the pressure zone of beams of concrete adopts normal concrete 1, in the whole longitudinal extent of beam or the tensile region of particular beam section build high-tenacity fiber refinforced cement based composites 2, interface region is adopted to process at normal concrete 1 and the calmodulin binding domain CaM of high-tenacity fiber refinforced cement based composites 2, described interface processing manually manufactures the impression with respective depth in interface or at the pre-buried steel part of interface zone.
In the whole longitudinal extent of described beam, the thickness of high-tenacity fiber refinforced cement based composites 2 is 1/10 ~ 1/5 of beam section heights; Described particular beam section refer to the moment of flexure controlling sections of beam for symmetry centre and its length be beam length 1/4 ~ 1/2 beam section, build that thickness is beam section height 1/10 ~ 1/5 of its tensile region high-tenacity fiber refinforced cement based composites 2.
Described high-tenacity fiber refinforced cement based composites 2 comprises cement, flyash, silicon ash, quartz sand, domestic fiber, water and water reducer, and the weight ratio of each component is: cement 11.4 ~ 48.7%, flyash 2% ~ 34.1%, silicon ash 12.0 ~ 12.4%, quartz sand 18.5 ~ 32.0%, domestic fiber 1.47 ~ 2.5%, water 15.5 ~ 22.7% and water reducer 0.2% ~ 1.2%; Described domestic fiber is domestic polyvinyl alcohol fiber or polypropylene fibre.
Described domestic staple length is 9 ~ 22mm, diameter is 0.015 ~ 0.05mm, Young's modulus is 30 ~ 150GPa, tensile strength is 1000 ~ 3500MPa, elongation limit is 2% ~ 15%.
Described High Strength Steel Bar 3 is 400MPa level reinforcing bar or 500MPa level reinforcing bar, is arranged in normal concrete 1 or in high-tenacity fiber refinforced cement based composites 2 or the calmodulin binding domain CaM of the two.
Described impression is semisphere concave point impression, and the radius of semisphere concave point is 2 ~ 3cm, and the distance of the spherical concave point of adjacent two halves is at 3 ~ 5cm.
Described steel part is High Strength Steel Bar 4 or steel wire or reinforced mesh 5.
Described preparation method be add the cement of above-mentioned weight ratio, flyash, silicon ash, quartz sand to stirrer agitation vat in carry out low speed dry mixing 1min, each body material is uniformly dispersed; Again the water of weight ratio and water reducer are added stirring at low speed 1min in above-mentioned body material, then high-speed stirring 2min, form the good pasty state slurry of uniform mobility; Finally add the domestic fiber of weight ratio, high-speed stirring 8min is to being uniformly dispersed.
The present invention is on the basis of traditional skeleton construction, introduce Functionally Graded Materials principle of design, hierarchial design is carried out to concrete, high-tenacity fiber refinforced cement based composites is prepared to replace tensile region part concrete with domestic fiber, pressure zone concrete still adopts normal concrete, adopt special interface region treatment technology, realize the even transition of material system in performance, and using High Strength Steel Bar as longitudinal tensile reinforcing bar, and then form the Novel reinforced concrete beam that supporting capacity is strong and endurance quality is high.Beneficial effect of the present invention: the present invention is using High Strength Steel Bar as longitudinal tensile reinforcing bar, tensile region part concrete is replaced to control the fracture width of beam under normal service condition with high-tenacity fiber refinforced cement based composites, both the high advantage of High Strength Steel Bar intensity can have been given full play to, reduce longitudinal tensile amount of reinforcement, economize on resources, the weather resistance of beams of concrete can be improved again.Therefore, the present invention is comprehensive, the premium properties that takes full advantage of High Strength Steel Bar and high-tenacity fiber refinforced cement based composites, and saving steel resource, improves structure durability.
Accompanying drawing explanation
Fig. 1 is the Making programme figure of high-tenacity fiber refinforced cement based composites in the present invention;
Fig. 2, Fig. 3 are stratified form figure and the interface processing figure of normal concrete and high-tenacity fiber refinforced cement based composites;
Fig. 4 is High Strength Steel Bar at one of position figure of Liang Tili;
Fig. 5 is the position figure bis-of High Strength Steel Bar at Liang Tili;
Fig. 6 is the position figure tri-of High Strength Steel Bar at Liang Tili;
In figure, 1 is normal concrete, and 2 is high-tenacity fiber refinforced cement based composites, and 3 is High Strength Steel Bar, and 4 is High Strength Steel Bar, and 5 is reinforced mesh.
Embodiment
The present invention is formed by two kinds of cement-based material layered combination, its structural feature: replace tensile region part concrete with high-tenacity fiber refinforced cement based composites, pressure zone concrete still adopts normal concrete, and adopt special interface region treatment technology, realize the even transition of material system in performance.As a kind of preferred version, the present invention builds high-tenacity fiber refinforced cement based composites as shown in Figure 2 in the whole longitudinal extent of beam, and its thickness is 1/10 ~ 1/5 of beam section height.As another kind of preferred version, the present invention builds high-tenacity fiber refinforced cement based composites in the tensile region of a certain particular beam section, as shown in Figure 3, this a certain particular beam section refer to the moment of flexure controlling sections of beam for symmetry centre and its length be beam length 1/4 ~ 1/2 beam section, its build that thickness is beam section height 1/10 ~ 1/5.
The interface processing method of two kinds of cement-based materials in above-mentioned a kind of High Strength Steel Bar functionally gradient beams of concrete: as a kind of preferred version, the interface of formerly building material manually manufactures the semisphere concave point impression with certain depth, the even transition of bi-material in performance is realized, as shown in Figure 2 by this semisphere concave point impression; As another kind of preferred version, at the interface cohesion region embedded bar of bi-material or steel wire or reinforcing mat, to eliminate the weak district of interface discontinuity, effectively ensure integrally-built integrity, stability, as shown in Figure 3.
In addition, longitudinal stress High Strength Steel Bar in the present invention all can be arranged in inside normal concrete or all be arranged in inside high-tenacity fiber refinforced cement based composites or be partly arranged in part inside normal concrete and be arranged in inside high-tenacity fiber refinforced cement based composites, as shown in Figure 4.
As shown in Figure 2, Figure 3, Figure 4, in the present invention, High Strength Steel Bar functionally gradient beams of concrete comprises normal concrete (1), high-tenacity fiber refinforced cement based composites (2), High Strength Steel Bar (3), and wherein High Strength Steel Bar all can be arranged in inside normal concrete or all be arranged in inside high-tenacity fiber refinforced cement based composites or be partly arranged in part inside normal concrete and be arranged in inside high-tenacity fiber refinforced cement based composites.In addition should according to structure bear load practical situation suitably in beam, arrange other arrangements of reinforcement.
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1, the each component formula of high-tenacity fiber refinforced cement based composites is: cement (P.O.42.5): silicon ash: water: quartz sand (100 ~ 200 order): water reducer=0.8:0.2:0.4:0.36:0.004, wherein fiber is domestic polyvinyl alcohol fiber or polypropylene fibre, and volume volume is 2.0%.
The preparation method of high-tenacity fiber refinforced cement based composites: by cement, flyash, silicon ash, quartz sand stirrer stirring at low speed 1min; Add water and the first stirring at low speed 1min of water reducer, then high-speed stirring 2min, improve concrete mobility; Finally add domestic fibre high-speed and stir 8min to fiber dispersion is even.
For a kind of High Strength Steel Bar functionally gradient beams of concrete of building at the scene, concrete implementation step is as follows:
(1) other arrangement of reinforcement in colligation High Strength Steel Bar and beam, and meet the code requirement of reinforcing bar binding;
(2) the building of high-tenacity fiber refinforced cement based composites: after step (1), the reinforcing bar that colligation is good is placed in template, the high-tenacity fiber refinforced cement based composites be strictly prepared from as stated above is built wherein, its build that thickness is beam section height 1/10 ~ 1/5;
(3) interface processing: after step (2), is positioned over high-tenacity fiber refinforced cement based composites surface by the semisphere concave point template be made in advance, forms artificial impression, and certain hour recession is except concave point template.Wherein the radius of first spherical concave point of semisphere concave point template is at 2 ~ 3cm, and the distance of the spherical concave point of adjacent two halves is at 3 ~ 5cm;
(4) the building of normal concrete: after step (3) process, building normal concrete to being full of whole mould, utilizing vibrating head to vibrate shaping.Normal concrete strength grade is at C30 ~ C60;
(5) on-the-spot curing concrete beam is being built.
A kind of High Strength Steel Bar functionally gradient beams of concrete for prefabricated: the reinforcing bar that colligation is good is inverted in template; First build normal concrete, its thickness is 4/5 ~ 9/10 of beam section height; Carry out interface processing again, be positioned over concrete surface form impression by the semisphere concave point template be made in advance, certain hour recession is except concave point template; Finally, high-tenacity fiber refinforced cement based composites is built.
Embodiment 2, the preparation method of high-tenacity fiber refinforced cement based composites is with example 1.
For a kind of High Strength Steel Bar functionally gradient beams of concrete of building at the scene, concrete implementation step is as follows:
(1) reinforcing bar binding and placement are with example 1;
(2) build a particular beam section with high-tenacity fiber refinforced cement based composites, its thickness is 1/10 ~ 1/5 of beam section height, and length is 1/4 ~ 1/2 of beam length, and beam section width is identical with beam.And this beam section is symmetrical in the moment of flexure controlling sections of beam.At beam section both sides and the pre-buried connecting reinforcement of upper surface or steel wire or reinforcing mat when building;
(3) build normal concrete, the shaping and maintenance of vibrating is with embodiment 1.
A kind of High Strength Steel Bar functionally gradient beams of concrete for prefabricated: the reinforcing bar that colligation is good is inverted in template; First build normal concrete; When building normal concrete, the position of high-tenacity fiber refinforced cement based composites beam section should be reserved, and in the interface cohesion region of bi-material pre-buried good connecting reinforcement or steel wire or reinforcing mat; Build high-tenacity fiber refinforced cement based composites beam section again; Final maintenance is shaping.
All material and relative dimensions all need to carry out calculating according to the needs of Practical Project and choose.
Claims (8)
1. a High Strength Steel Bar functionally gradient beams of concrete, comprise normal concrete (1), high-tenacity fiber refinforced cement based composites (2) and the High Strength Steel Bar (3) be arranged in normal concrete (1) or high-tenacity fiber refinforced cement based composites (2), it is characterized in that, described normal concrete (1), high-tenacity fiber refinforced cement based composites (2) layered combination, the pressure zone of beams of concrete adopts normal concrete (1), in the whole longitudinal extent of beam or the tensile region of particular beam section build high-tenacity fiber refinforced cement based composites (2), interface region is adopted to process at normal concrete (1) and the calmodulin binding domain CaM of high-tenacity fiber refinforced cement based composites (2), described interface processing manually manufactures the impression with respective depth in interface or at the pre-buried steel part of interface zone.
2. High Strength Steel Bar functionally gradient beams of concrete according to claim 1, is characterized in that, in the whole longitudinal extent of described beam, the thickness of high-tenacity fiber refinforced cement based composites (2) is 1/10 ~ 1/5 of beam section height; Described particular beam section refer to the moment of flexure controlling sections of beam for symmetry centre and its length be beam length 1/4 ~ 1/2 beam section, build that thickness is beam section height 1/10 ~ 1/5 of its tensile region high-tenacity fiber refinforced cement based composites (2).
3. High Strength Steel Bar functionally gradient beams of concrete according to claim 1, it is characterized in that, described high-tenacity fiber refinforced cement based composites (2) comprises cement, flyash, silicon ash, quartz sand, domestic fiber, water and water reducer, and the weight ratio of each component is: cement 11.4 ~ 48.7%, flyash 2% ~ 34.1%, silicon ash 12.0 ~ 12.4%, quartz sand 18.5 ~ 32.0%, domestic fiber 1.47 ~ 2.5%, water 15.5 ~ 22.7% and water reducer 0.2% ~ 1.2%; Described domestic fiber is domestic polyvinyl alcohol fiber or polypropylene fibre.
4. High Strength Steel Bar functionally gradient beams of concrete according to claim 3, it is characterized in that, described domestic staple length is 9 ~ 22mm, diameter is 0.015 ~ 0.05mm, Young's modulus is 30 ~ 150GPa, tensile strength is 1000 ~ 3500MPa, elongation limit is 2% ~ 15%.
5. High Strength Steel Bar functionally gradient beams of concrete according to claim 1, it is characterized in that, described High Strength Steel Bar (3) is 400MPa level reinforcing bar or 500MPa level reinforcing bar, to be arranged in normal concrete (1) or in high-tenacity fiber refinforced cement based composites (2) or the calmodulin binding domain CaM of the two.
6. High Strength Steel Bar functionally gradient beams of concrete according to claim 1, is characterized in that, described
Impression is semisphere concave point impression, and the radius of semisphere concave point is 2 ~ 3cm, and the distance of the spherical concave point of adjacent two halves is at 3 ~ 5cm.
7. High Strength Steel Bar functionally gradient beams of concrete according to claim 1, is characterized in that, described steel part is High Strength Steel Bar (4) or steel wire or reinforced mesh (5).
8. the preparation method of high-tenacity fiber refinforced cement based composites in a claim 1, it is characterized in that, described preparation method be add the cement of weight ratio described in claim 3, flyash, silicon ash, quartz sand to stirrer agitation vat in carry out low speed dry mixing 1min, each body material is uniformly dispersed; Again the water of weight ratio and water reducer are added stirring at low speed 1min in above-mentioned body material, then high-speed stirring 2min, form the good pasty state slurry of uniform mobility; Finally add the domestic fiber of weight ratio, high-speed stirring 8min is to being uniformly dispersed.
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| CN114396137B (en) * | 2022-01-26 | 2023-08-22 | 香港嘉乐科技发展有限公司 | Construction method of interface between high-strength high-toughness concrete and common concrete |
| CN114873968A (en) * | 2022-05-05 | 2022-08-09 | 中国建筑材料科学研究总院有限公司 | High-crack-resistance concrete and forming method and application thereof |
| CN114873968B (en) * | 2022-05-05 | 2023-07-21 | 中国建筑材料科学研究总院有限公司 | High-crack-resistance concrete and forming method and application thereof |
| CN117846211A (en) * | 2023-12-28 | 2024-04-09 | 广东工业大学 | 3D printing low-carbon optimized deformed concrete slab and preparation process thereof |
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