AU2020101194A4 - An FRP bars reinforced seawater and sea sand concrete - UHDCC composite beam and its construction method - Google Patents
An FRP bars reinforced seawater and sea sand concrete - UHDCC composite beam and its construction method Download PDFInfo
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- AU2020101194A4 AU2020101194A4 AU2020101194A AU2020101194A AU2020101194A4 AU 2020101194 A4 AU2020101194 A4 AU 2020101194A4 AU 2020101194 A AU2020101194 A AU 2020101194A AU 2020101194 A AU2020101194 A AU 2020101194A AU 2020101194 A4 AU2020101194 A4 AU 2020101194A4
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/002—Water
- C04B22/0026—Salt water, e.g. seawater
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
of Descriptions
The invention relates to an FRP bars reinforced seawater and sea-sand concrete (SSC)
ultra-high ductile cementitious composite (UHDCC) composite beam and its construction
method. The composite beam includes an SSC-UHDCC beam and FRP bar cage embedded in
the beam. The cage of FRP bars includes FRP tensile longitudinal bars, FRP hanger bars (or
compression bars), and FRP stirrups. FRP tensile bars and FRP hanger bars (or compression
bars) are located along the longitudinal direction of the beam body. FRP stirrups form the outer
part of the FRP bar cage and link FRP tensile longitudinal bars and hanger bars together. The
SSC-UHDCC beam includes an SSC section with the attachment of a composite material layer
made of UHDCC where FRP tensile longitudinal bars are located in the center. Compared with
the prior art, the present invention replaces ordinary concrete with seawater and sea sand
concrete, which can effectively alleviate the shortage of natural resources and give full play to
the corrosion resistance advantages of FRP materials; Replacing the bottom of the beam with a
composite layer made of UHDCC can improve the bending resistance of FRP rebar reinforced
SSC beams, even the crack distribution, and reduce the crack width in the beam.
Drawings of Descriptions
1 4 6
Figure 1
1
Figure 2
1/1
Description
Drawings of Descriptions
1 4 6
Figure 1
1
Figure 2
1/1
Descriptions An FRP bars reinforced seawater and sea sand concrete - UHDCC composite beam
and its construction method
Technical Field
The invention relates to a structural engineering technology, in particular to an FRP bars reinforced seawater and sea sand concrete (SSC)-UHDCC composite beam and its construction method.
Background Technology
Based on the advantages of lightweight, high strength, and good corrosion resistance of FRP bars, FRP bars are used to replace steel bars, and freshwater and river sands are replaced by seawater and sea-sands to make FRP bars reinforced seawater sea-sand concrete (SSC), structural members. Taking seawater and sea-sands locally is of great significance to alleviate the crisis of river sand resource depletion and solve the problem of corrosion damage of steel bars in the marine environment. At the same time, it has great potential for the application of durable marine infrastructure construction. Although FRP bars have good corrosion resistance and mechanical properties, FRP bars are linear elastic materials, and there is no yield platform as that in steel bars. Therefore, the bending failure of the FRP bar reinforced concrete beams is brittle. Its ductility is poor. The anti-crack performance is not prominent.
Invention Summary
The purpose of the present invention is to provide an FRP bars reinforced SSC - UHDCC composite beam and its construction method, so as to make full use of the FRP bars which are light, high strength, and good corrosion resistance in the SSC, and fully utilize of supreme tensile and anti-cracking performance of UHDCC. The aim is to improve the flexural performance of FRP rebar reinforced SSC beams, especially the even distribution of cracks, reduction of crack width, and deformation ductility.
The object of the present invention can be achieved by the following technical solutions:
An FRP bars reinforced SSC - UHDCC composite beam includes an SSC-UHDCC beam and FRP bar cage embedded in the beam. The cage of FRP bars includes FRP tensile longitudinal bars, FRP hanger bars (or compression bars), and FRP stirrups. FRP tensile bars and FRP hanger bars (or compression bars) are located along the longitudinal direction of the beam body. FRP stirrups form the outer part of the FRP bar cage and link FRP tensile longitudinal bars and hanger bars together. The SSC-UHDCC beam includes an SSC section with the attachment of a composite material layer made of UHDCC and FRP tensile longitudinal bars are located in the UHDCC layer.
The FRP tensile longitudinal bars are located along the longitudinal direction of the
UHDCC layer, and in the middle of UHDCC layer.
The thickness of UHDCC layer is:
d2 =2d,
where d 2 is the thickness of UHDCC layer, d, is the thickness of beam cover at the FRP tensile longitudinal bar side.
The FRP tensile longitudinal bars, FRP hanger bars (or compression bars) and FRP stirrups are basalt FRP bars, carbon FRP bars or glass FRP bars.
The strength of the SSC is within the range of 20-50 MPa.
A construction method of an FRP bars reinforced SSC-UHDCC composite beam, including:
Step 1: FRP tensile longitudinal bars, FRP hanger bars (or compression bars), and FRP stirrups are tied together to build the FRP bar cage.
Step 2: A layer of mold release agent is brushed on the inside of the mold, and the FRP bar cage is placed in the mold, where the FRP hanger bars (or compression bars) are placed at the bottom of the mold.
Step 3: Seawater and sea-sand concrete grout are poured into the mold to a set height.
Step 4: After curing for a set number of days, the UHDCC grout is poured on the top of SSC until the entire mold is filled.
Step 3 includes:
Step 3a: After the SCC grout is poured to the set height, it is vibrated.
Step 3b: The surface treatment of the SSC top surface meets the interface roughness requirement.
Step 4 includes:
Step 4a: After SSC curing for a set number of days, the UHDCC grout is poured with vibration on the top of SSC until the entire mold is filled.
Step 4b: The finishing surface of the UHDCC layer needs troweling.
The set number of curing days is seven days.
The interface roughness requirement is to form uniformly distributed spot pits with a depth of about 3 mm on the finishing surface of SSC.
Compared with the prior art, the present invention has the following beneficial effects:
1) Replacing the tensile cover of the seawater sea sand concrete beam with a composite material layer made of UHDCC, which can improve the flexural performance of the FRP rebar reinforced SSC beam, especially the even distribution of cracks, and reduction of cracks width in the beam.
2) The FRP tensile longitudinal bars are located along the longitudinal direction of the UHDCC layer, and in the middle of UHDCC layer. The UHDCC layer can effectively protect the FRP tensile longitudinal bars and enhance the mechanical efficiency of FRP bars.
3) The thickness of UHDCC layer is twice the thickness of the cover at the tensile bar side. The tensile zone can be composed of the UHDCC layer and part of the SSC layer to enhance the bending strength.
4) The surface roughness of the interface between the SSC and UHDCC layer is regulated by a threshold, which can increase the interface bond between UHDCC and SSC and avoid debonding.
Description of Drawings
Figure 1 is a schematic drawing of the present invention;
Figure 2 is a schematic drawing of the A-A section in Figure 1;
where 1. Seawater and sea sand concrete section, 2. UHDCC layer, 3. FRP tensile longitudinal bar, 4. FRP hanger bar (or compression bar), 5. FRP stirrup, 6. Top surface of the composite beam, 7. Interface between SSC and UHDCC, 8. Bottom surface of composite beam.
Detailed Description of the Presently Preferred Embodiments
The present invention will be described in detail below referring to the drawings and specific embodiments. The embodiments are implemented on the premise of the technical solutions of the present invention, and a detailed embodiment and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
An FRP bars reinforced SSC-UHDCC composite beam, in which UHDCC (Ultra-high Ductile Cementitious Composites) overcomes the softening properties of traditional cement-based materials under tensile load. It exhibits a pseudo-hardening characteristic similar to that of metal materials, and can realize the transition from the macrocracks development mode as in traditional cement-based materials to the multiple micro-cracks development mode. It has features of significant nonlinear deformation, excellent anti-crack performance, ductility and energy absorption. It can significantly improve the bending resistance of beams.
This application is based on the FRP bars reinforced SSC structural members, the UHDCC with excellent tensile properties is introduced, and the section of the concrete beam is designed in layers. The concrete layer around the FRP tensile longitudinal bars is replaced by the UHDCC layer to form FRP reinforced SSC-UHDCC composite beam. The concrete in the compression zone is still SSC. The interface needs to maintain a certain roughness to increase the bond strength between SSC and UHDCC surfaces. The use of the UHDCC layer together with the FRP bars is in combination with FRP lightweight, high strength, good corrosion resistance and UHDCC supreme anti-crack performance to form a new FRP bars reinforced SSC-UHDCC composite beam.
As shown in Figures 1 and 2, it includes the beam and the FRP bar cage embedded in the beam. The cage of FRP bars includes FRP tensile longitudinal bars, FRP hanger bars (or compression bars), and FRP stirrups. FRP tensile bars and FRP hanger bars (or compression bars) are located along the longitudinal direction of the beam body. FRP stirrups form the outer part of the FRP bar cage and link FRP tensile longitudinal bars and hanger bars together. The SSC-UHDCC beam includes an SSC section with the attachment of a composite material layer made of UHDCC and FRP tensile longitudinal bars are located in the UHDCC layer.
The FRP tensile longitudinal bars are located along the longitudinal direction of the UHDCC layer, and in the middle of UHDCC layer.
d2 =2d,
The thickness of UHDCC layer is:
d2 = 2d,
where d2 is the thickness of UHDCC layer, d, is the thickness of beam cover at the FRP tensile longitudinal bar side.
The FRP tensile longitudinal bars, FRP hanger bars (or compression bars) and FRP stirrups are basalt FRP bars, carbon FRP bars or glass FRP bars.
The strength of seawater and sea-sand concrete is in the range of 20-50MPa. Besides, the minimum diameter and anchorage length of FRP tensile longitudinal bars comply with the guide "ACI 440.JR-2015 Guide for the Design and Construction of Structural Concrete Reinforced with FRP bars ". The stirrup area is calculated according to the shear demand of composite beam and meets the minimum reinforcement ratio requirement, and the stirrup spacing meets the maximum spacing requirement.
A construction method of an FRP bars reinforced SSC-UHDCC composite beam, including:
Step 1: According to the construction drawing, FRP tensile longitudinal bars, FRP hanger bars (or compression bars), and FRP stirrups are tied to build the FRP bar cage.
Step 2: A layer of mold release agent is brushed onto the inside surfaces of the mold and the FRP bar cage is placed in the mold, where the FRP hanger bars (or compression bars) are at the bottom of the mold.
Step 3: Seawater and sea-sand concrete grout are poured into the mold to a set height, including:
Step 3a: After the SCC grout is poured to the set height, it is vibrated.
Step 3b: It does not need to smooth the finishing surface, and the surface treatment of the interface between the poured SSC and UHDCC layer is assisted by artificial roughening measures to meet the surface roughness requirement. The requirement is to form uniformly distributed pits with a depth of about 3 mm on the finishing surface of SSC. If lifting of casted beam is needed, the hooks can be embedded at both ends of the beam according to the place direction of the beam in the structure.
Step 4: After curing for seven days, the UHDCC grout is poured on the top of SSC until the entire mold is filled, specifically including:
Step 4a: After curing SSC for seven days, the UHDCC grout is poured with vibration on the top of SSC until the entire mold is filled.
Step 4b: The finishing surface of the UHDCC layer needs troweling to ensure that the top surface of the composite beam is smooth.
Step 5: The composite beam is maintained at the pouring site after step 3 and step 4. The beam needs to be covered with geotextiles or straw mats with watering treatment on the coverage every day during the curing stage.
Claims (8)
1. The invention relates to an FRP bars reinforced seawater and sea-sand concrete (SSC)-ultra-high ductile cementitious composite (UHDCC) composite beam and its construction method. The composite beam includes an SSC-UHDCC beam and FRP bar cage embedded in the beam. The cage of FRP bars includes FRP tensile longitudinal bars, FRP hanger bars (or compression bars), and FRP stirrups. FRP tensile longitudinal bars and FRP hanger bars (or compression bars) are located along the longitudinal direction of the beam. The FRP stirrups form the outer part of the FRP bar cage and link FRP tensile longitudinal bars and hanger bars together. The SSC-UHDCC beam includes an SSC section with the attachment of a composite material layer made of UHDCC. FRP tensile longitudinal bars are located in the UHDCC layer.
The FRP tensile longitudinal bars are located along the longitudinal direction of the UHDCC layer, and in the middle of UHDCC layer.
The thickness of UHDCC layer is:
d 2 = 2d
where d 2 is the thickness of UHDCC layer. d, is the thickness of beam cover at the FRP tensile longitudinal bar side.
It has significant improvement on the anti-crack performance, ductility, and energy absorption capacity.
2. An FRP bars reinforced SSC-UHDCC composite beam according to claim 1 is characterized by the reinforcement bars including FRP tensile longitudinal bars, FRP hanger bars (or compression bars), and FRP stirrups which can be basalt, carbon or glass FRP bars.
3. An FRP bars reinforced SSC-UHDCC composite beam according to claim 1 is characterized by the concrete which is composed of seawater, sea sands, coarse aggregates, and binders.
4. A construction method of an FRP bars reinforced SSC-UHDCC composite beam according to any one of claims 1 to 3 is characterized in that it includes:
Step 1: FRP tensile longitudinal reinforcement, FRP hanger reinforcement (or compression reinforcement), and FRP stirrup are tied together to build the FRP bar cage.
Step 2: A layer of mold release agent is brushed onto the inside surfaces of the mold and the FRP bar cage is placed in the mold, where the FRP hanger bars (or compression bars) are at the bottom of the mold.
Step 3: Seawater and sea-sand concrete grout are poured into the mold to a set height.
Step 4: After curing for a set number of days, the UHDCC grout is poured on the top of
SSC until the entire mold is filled.
5. The method according to claim 4 is characterized in that step S3 comprises:
Step 3a: During the SCC grout is poured to the set height, it is vibrated.
Step3b: The surface treatment of the SSC top surface meets the interface roughness requirement.
6. The method according to claim 4 is characterized in that step S4 includes:
Step 4a: After SSC curing for a set number of days, the UHDCC grout is poured with vibration on the top of SSC until the entire mold is filled.
Step 4b: The finishing surface of the UHDCC layer needs troweling.
7. The method according to claim 4 or 6 is characterized in that the set number of curing days is seven days.
8. The method according to claim 5 is characterized in that the interface roughness requirement is to form uniformly distributed spot pits with a depth of about 3 mm on the finishing surface of SSC.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020101194A AU2020101194A4 (en) | 2020-06-30 | 2020-06-30 | An FRP bars reinforced seawater and sea sand concrete - UHDCC composite beam and its construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| AU2020101194A AU2020101194A4 (en) | 2020-06-30 | 2020-06-30 | An FRP bars reinforced seawater and sea sand concrete - UHDCC composite beam and its construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047511A (en) * | 2021-03-09 | 2021-06-29 | 武汉大学 | Assembled FRP-gradient sea sand concrete combined wallboard |
| CN114033101A (en) * | 2021-11-25 | 2022-02-11 | 华中科技大学 | Full FRP (fiber reinforced plastic) rib reinforced seawater sea sand concrete high-ductility beam and application thereof |
| CN114085046A (en) * | 2021-10-11 | 2022-02-25 | 青岛理工大学 | Ocean concrete structure reinforced by adopting hybrid FRP (fiber reinforced Plastic) ribs and preparation method thereof |
| CN115012587A (en) * | 2022-07-25 | 2022-09-06 | 翟贤明 | Net cage prepared based on FRP (fiber reinforced Plastic) and preparation method thereof |
| CN115478648A (en) * | 2022-09-16 | 2022-12-16 | 哈尔滨工业大学 | Novel integrated wallboard suitable for offshore floating building and preparation method thereof |
-
2020
- 2020-06-30 AU AU2020101194A patent/AU2020101194A4/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047511A (en) * | 2021-03-09 | 2021-06-29 | 武汉大学 | Assembled FRP-gradient sea sand concrete combined wallboard |
| CN114085046A (en) * | 2021-10-11 | 2022-02-25 | 青岛理工大学 | Ocean concrete structure reinforced by adopting hybrid FRP (fiber reinforced Plastic) ribs and preparation method thereof |
| CN114033101A (en) * | 2021-11-25 | 2022-02-11 | 华中科技大学 | Full FRP (fiber reinforced plastic) rib reinforced seawater sea sand concrete high-ductility beam and application thereof |
| CN115012587A (en) * | 2022-07-25 | 2022-09-06 | 翟贤明 | Net cage prepared based on FRP (fiber reinforced Plastic) and preparation method thereof |
| CN115478648A (en) * | 2022-09-16 | 2022-12-16 | 哈尔滨工业大学 | Novel integrated wallboard suitable for offshore floating building and preparation method thereof |
| CN115478648B (en) * | 2022-09-16 | 2024-05-28 | 哈尔滨工业大学 | Novel integrated wallboard suitable for offshore floating building and preparation method thereof |
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