CN111454026A - Underwater foundation bagged concrete, preparation method and application - Google Patents
Underwater foundation bagged concrete, preparation method and application Download PDFInfo
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- CN111454026A CN111454026A CN202010256378.3A CN202010256378A CN111454026A CN 111454026 A CN111454026 A CN 111454026A CN 202010256378 A CN202010256378 A CN 202010256378A CN 111454026 A CN111454026 A CN 111454026A
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- Prior art keywords
- concrete
- bagged
- bagged concrete
- underwater foundation
- underwater
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/50—Anchored foundations
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/74—Underwater applications
Abstract
The application discloses an underwater foundation anti-scouring bagged concrete, a preparation method and application, wherein the raw materials of each cubic meter of concrete comprise the following components: 200-380 kg of Portland cement, 710-815 kg of fine aggregate, 1000-1200 kg of coarse aggregate, 160-185 kg of water, 0.5-1.0 kg of polypropylene fiber, 30-70 g of first additive and 60-150 g of second additive. The preparation method comprises the following steps: weighing raw materials according to the mixing proportion of the bagged concrete; uniformly stirring and mixing the raw materials by using a centralized stirrer to obtain concrete; testing the slump of the concrete, wherein the slump is controlled to be 50-100 mm; filling the mixed concrete into a geotextile bag made of plastic flat filament woven geotextile; and sealing the geotextile bag. The bagged concrete for the underwater foundation does not need to be vibrated, and the compressive strength of the bagged concrete for 7 days and the compressive strength of the bagged concrete for 28 days are higher than 10.0MPa after the bagged concrete is hardened underwater, so that the requirement of underwater foundation scour resistance is met.
Description
Technical Field
The application belongs to the technical field of concrete materials, and particularly relates to bagged concrete for an underwater foundation, a preparation method and application.
Background
The underwater foundation is used as a member for bearing all loads of structures such as bridges, water conservancy and wharfs, and the foundation structures such as piles and the like can change the original hydrodynamic conditions such as waves and water flows in the area, so that the originally established sediment transport balance is broken, and the periphery of the foundation is flushed. Scouring is one of the main reasons for causing the emptying settlement and even loosening of the underwater foundation, the emptying settlement further causes the cracking of a concrete structure, and the loosening finally causes the structural collapse. The bagged concrete is adopted to reinforce and protect the underwater foundation, which is an effective method for improving the erosion resistance of the underwater foundation. However, since the bagged concrete is suspended in water before being set and hardened, and is affected by water flow scouring, the properties of the bagged concrete, such as cement paste loss, setting and hardening, are significantly affected, and experimental research on the preparation technology of underwater anti-scouring bagged concrete is required to be carried out, so as to meet the construction requirements of underwater anti-scouring protection.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the technical problem to be solved by the application is to provide the bagged concrete for the underwater foundation, the preparation method and the application, the prepared concrete does not need to be vibrated, the compressive strength is greater than 10.0MPa after 7 days of underwater hardening, the compressive strength is greater than 15.0MPa after 28 days of underwater hardening, and the requirement of the underwater foundation on scour resistance is met.
In order to solve the technical problem, the application is realized by the following technical scheme:
the application provides an underwater foundation anti-scouring bagged concrete, wherein the raw materials of each cubic meter of concrete comprise the following components:
further, the underwater foundation anti-scouring bagged concrete comprises the following raw materials per cubic meter:
further, the underwater foundation scour-resistant bagged concrete is characterized in that the strength grade of the cement is greater than or equal to 42.5, and preferably, ordinary portland cement with the strength grade of 42.5 is adopted in the concrete.
Further, the underwater foundation anti-scouring bagged concrete is characterized in that the fineness modulus of the fine aggregate is 2.3-3.0, the mud content is not more than 1.5%, and the mud block content is not more than 0.5%. Preferably, the fine aggregate is sand.
Further, the underwater foundation anti-scouring bagged concrete is characterized in that the maximum particle size of the coarse aggregate is not more than 31.5mm and consists of 5-16mm and 16-31.5mm grades, wherein the ratio of the 5-16mm grade to the 16-31.5mm grade is 2: 8, the content of the needle sheets is not more than 8 percent, the content of mud is not more than 0.7 percent, and the content of mud blocks is not more than 0.2 percent. Preferably, the coarse aggregate is stone.
Further, the underwater foundation anti-scouring bagged concrete is characterized in that the polypropylene fibers have the length of 10mm-15mm, the diameter of 18 +/-2 mu mm and the density of 0.91g/m3(ii) a The tensile strength is not less than 300 MPa; elongation 28%; the elastic modulus is not less than 3500 MPa.
Further, the underwater foundation anti-scouring bagged concrete is characterized in that the first additive is a high polymer material.
Further, the underwater foundation anti-scouring bagged concrete is characterized in that the polymer material comprises hydroxymethyl cellulose, and the viscosity of the hydroxymethyl cellulose is 200Pa · s.
Further, the underwater foundation anti-scouring bagged concrete is characterized in that the second additive is a water-soluble high polymer.
Further, in the above underwater foundation anti-scouring bagged concrete, the water-soluble high molecular polymer includes polyacrylamide which is white powder, and the molecular weight of the adopted polyacrylamide is 107And (4) stages.
The application provides a preparation method of the underwater foundation anti-scouring bagged concrete, which comprises the following steps:
weighing raw materials according to the mixing proportion of the bagged concrete;
uniformly stirring and mixing the raw materials by using a centralized stirrer to obtain concrete;
testing the slump of the concrete, wherein the slump is controlled to be 50-100 mm;
filling the mixed concrete into a geotextile bag made of plastic flat filament woven geotextile;
and sealing the geotextile bag.
Further, in the above preparation method, the geotextile used for the geotextile bag comprises: mass per unit area is more than or equal to 200g/m2Longitudinal breaking strength is more than or equal to 2000N/50mm, transverse breaking strength is more than or equal to 1400N/50mm, longitudinal breaking elongation is less than or equal to 25%, transverse breaking elongation is less than or equal to 25%, longitudinal tearing strength is more than 500N, transverse tearing strength is more than 400N, CBR bursting strength is more than 3200N, piercing strength is more than 500N, drop hammer penetration diameter is less than 9.0mm, equivalent aperture O is larger than equivalent aperture90Less than 0.2mm, and vertical permeability coefficient more than 2.0 × 10-3cm/s。
The application also provides an application of the underwater foundation anti-scouring bagged concrete.
This application is from coagulationThe strength and the economical efficiency of the soil are comprehensively considered, and a better bagged concrete mixing proportion is provided, namely the consumption of the portland cement of the concrete is 200kg/m3～380kg/m3The compressive strength of the concrete can be ensured; the sand rate is 36-45%, the reasonable sand rate can ensure the strength of the concrete and the workability of the concrete, and preferably, the sand rate of the concrete is controlled to be about 42%; in addition, the hydration of the silicate cement ensures the strength of the concrete, the polypropylene fiber can improve the cohesiveness of the concrete, the hydroxymethyl cellulose and the polyacrylamide improve the water dispersibility of the concrete, prevent the loss of cement paste, effectively improve the compactness of the concrete, ensure the development of the underwater strength of the concrete, and adopt a geotextile bag suitable for underwater scouring resistance, thereby effectively protecting underwater foundation scouring.
The bagged concrete for the underwater foundation does not need to be vibrated, and the compressive strength of the bagged concrete for 7 days and the compressive strength of the bagged concrete for 28 days are higher than 10.0MPa after the bagged concrete is hardened underwater, so that the requirement of underwater foundation scour resistance is met.
Detailed Description
The conception, specific structure, and technical effects of the present application will be further described below to fully understand the purpose, features, and effects of the present application.
Firstly, the raw materials and plastic flat wires adopted by the embodiment are woven into the geotextile bag:
(1) cement: the strength grade 42.5 ordinary portland cement produced by Shanghai conch cement plants is adopted.
(2) Fine aggregate (preferably sand): the medium sand with the fineness modulus of 2.5 contains 0.6 percent of mud and 0.1 percent of mud blocks.
(3) Coarse aggregate (preferably stone): 5-31.5mm continuous graded broken stone (prepared by two-stage preparation of 5-16mm and 16-31.5mm, wherein the ratio of 5-16mm grade and 16-31.5mm grade is 2: 8, the mud content is 0.4%, and the mud block content is 0.1%.
(4) Polypropylene fiber: adopts polypropylene fiber produced by Shanghai Tongji ark special building materials Co., Ltd, the fiber length is 12mm, the diameter is 18 mu m, and the density is 0.91g/m3(ii) a High tensile strengthThe degree is not less than 300MPa, and the elongation is 28 percent; the elastic modulus is 3500 MPa.
(5) A first admixture: hydroxymethyl cellulose (HPMC) produced by Anhui Jinhui Shuihao materials Co., Ltd is adopted, and the viscosity is 200 pas.
(6) A second additive: the molecular weight of polyacrylamide produced by Shanghai constant-force water treatment materials GmbH is 107。
(7) Weaving a geotextile bag by using plastic flat wires: the mass per unit area produced by the stannless reclaimed water geotechnical new material Limited company is 200g/m2The woven geotextile bag.
Second, the test method of this example
(1) Mechanical properties
The compressive strength test is carried out according to the relevant regulations of technical Specification for testing concrete strength by a core drilling method (JGJ/T384-2016).
The curing method adopted in this embodiment is as follows: mixing concrete according to the concrete mixing proportion, immediately putting 120kg of concrete into a geotextile woven bag, putting the geotextile woven bag into water for soaking for 7 days, taking out the geotextile woven bag, drilling a core sample, and testing the compressive strength for 7 days; and after the other core samples are subjected to standard curing for 28 days, testing the compressive strength of the core samples, controlling the curing temperature of the concrete to be 20 +/-2 ℃ and controlling the relative humidity to be more than 95%.
Third, the mixing ratio of each raw material in this example
Concrete was prepared from materials such as 42.5 ordinary portland cement, and the concrete formulation is shown in table 1.
TABLE 1 concrete mix proportion (kg/m)3)
Fourthly, concrete performance test is carried out based on the mixing ratio of the raw materials
The compressive strength of the concrete sampled through the above core was as shown in Table 2.
TABLE 2 concrete compression Strength test results (MPa)
| Numbering | 7 days | 28 days |
| 1 | 12.0 | 16.5 |
| 2 | 15.0 | 19.0 |
| 3 | 17.2 | 20.1 |
| 4 | 19.1 | 22.5 |
| 5 | 21.5 | 24.1 |
| 6 | 23.2 | 27.1 |
The test results in the table 2 show that the compressive strength of the bagged concrete core sample in the embodiment is greater than 10.0MPa in 7 days, and greater than 15.0MPa in 28 days, so that the underwater anti-scouring quality requirement can be met.
The preparation method of the bagged concrete comprises the following steps:
step one, weighing raw materials according to the mixing ratio of the bagged concrete;
step two, uniformly stirring and mixing the raw materials by using a centralized stirrer to obtain concrete, wherein the stirring time of the concrete is not less than 90 s;
step three, testing the slump of the concrete, wherein the slump is controlled to be 50-100 mm;
step four, weaving the geotextile by using the plastic flat filaments to manufacture a geotextile bag;
wherein the geotextile bag has a length of 95cm +/-5 and a width of 70cm +/-5, and the adopted plastic flat filament woven geotextile has a mass per unit area of more than or equal to 200g/m2Longitudinal breaking strength is more than or equal to 2000N/50mm, transverse breaking strength is more than or equal to 1400N/50mm, longitudinal breaking elongation is less than or equal to 25%, transverse breaking elongation is less than or equal to 25%, longitudinal tearing strength is more than 500N, transverse tearing strength is more than 400N, CBR bursting strength is more than 3200N, piercing strength is more than 500N, drop hammer penetration diameter is less than 9.0mm, equivalent aperture O is larger than equivalent aperture90Less than 0.2mm, and vertical permeability coefficient more than 2.0 × 10-3cm/s。
By controlling the indexes such as mechanical property, equivalent aperture, permeability coefficient and the like of the geotextile bag, the anti-scouring quality requirement of the underwater bagged concrete is ensured.
Step five, filling the mixed concrete into woven geotextile bags, wherein the weight of each bag is controlled to be 100kg-150 kg;
6) and sealing the geotextile bag filled with the concrete by adopting a special sewing machine.
The application also provides application of the underwater foundation anti-scouring bagged concrete, and the prepared concrete can be widely applied to the technical fields of building materials and the like, and can provide an effective solution for the anti-scouring of underwater foundations of projects such as bridges, offshore wind power and the like.
The application comprehensively considers the aspects of the strength, the economical efficiency and the like of the concrete and provides a better bagged concrete mixing proportion, namely the using amount of the portland cement of the concrete is 200kg/m3～380kg/m3The compressive strength of the concrete can be ensured; wherein, the sand rate is 36-45%, and is reasonableThe sand rate of the concrete can ensure the strength of the concrete and the workability of the concrete, and preferably, the sand rate of the concrete is controlled to be about 42 percent; in addition, the hydration of the silicate cement ensures the strength of the concrete, the polypropylene fiber can improve the cohesiveness of the concrete, the hydroxymethyl cellulose and the polyacrylamide improve the water dispersibility of the concrete, prevent the loss of cement paste, effectively improve the compactness of the concrete, and ensure the development of the underwater strength of the concrete, thereby effectively preventing the underwater foundation from being washed away. The application also provides a geotextile bag suitable for underwater scouring resistance, provides control indexes such as mechanical property, equivalent aperture and permeability coefficient, and ensures the requirement of underwater bagged concrete scouring resistance quality. The bagged concrete for the underwater foundation does not need to be vibrated, and the compressive strength of the bagged concrete for 7 days and the compressive strength of the bagged concrete for 28 days are higher than 10.0MPa after the bagged concrete is hardened underwater, so that the requirement of underwater foundation scour resistance is met. Therefore, the method has good market application prospect.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (12)
1. The underwater foundation anti-scouring bagged concrete is characterized in that the raw materials of per cubic meter of concrete comprise the following components:
2. the underwater foundation scouring-resistant bagged concrete of claim 1, wherein the strength grade of the portland cement is 42.5 or more.
3. The underwater foundation scouring-resistant bagged concrete as claimed in claim 1, wherein the fineness modulus of the fine aggregate is 2.3-3.0, the mud content is not more than 1.5%, and the mud block content is not more than 0.5%.
4. The underwater foundation scour resistant bagged concrete of claim 1, 2 or 3, wherein the coarse aggregate has a maximum particle size of not more than 31.5mm, consisting of 5-16mm and 16-31.5mm grades, wherein the ratio of 5-16mm grade to 16-31.5mm grade is 2: 8, the content of the needle sheets is not more than 8 percent, the content of mud is not more than 0.7 percent, and the content of mud blocks is not more than 0.2 percent.
5. The underwater foundation scouring-resistant bagged concrete as claimed in claim 1, wherein the polypropylene fibers have a length of 10mm to 15mm, a diameter of 18 ± 2 μmm and a density of 0.91g/m3(ii) a The tensile strength is not less than 300 MPa; elongation 28%; the elastic modulus is not less than 3500 MPa.
6. The underwater foundation scouring-resistant bagged concrete as claimed in claim 1, 2, 3 or 5, wherein the first admixture is a high molecular material.
7. The underwater basal scouring resistant bagged concrete of claim 6, wherein the polymer material comprises hydroxymethyl cellulose having a viscosity of 200 Pa-s.
8. The underwater foundation scouring-resistant bagged concrete of claim 1, 2, 3 or 5, wherein the second additive is a water-soluble high molecular polymer.
9. The underwater basal scouring resistant bagged concrete of claim 7, wherein the water-soluble high molecular polymer comprises polyacrylamide.
10. A method for preparing the underwater foundation anti-scour bagged concrete according to any one of claims 1 to 9, comprising the steps of:
weighing raw materials according to the mixing proportion of the bagged concrete;
uniformly stirring and mixing the raw materials by using a centralized stirrer to obtain concrete;
testing the slump of the concrete, wherein the slump is controlled to be 50-100 mm;
filling the mixed concrete into a geotextile bag made of plastic flat filament woven geotextile;
and sealing the geotextile bag.
11. The method for preparing according to claim 10, wherein the geotextile used for weaving the geotextile bag has: mass per unit area is more than or equal to 200g/m2Longitudinal breaking strength is more than or equal to 2000N/50mm, transverse breaking strength is more than or equal to 1400N/50mm, longitudinal breaking elongation is less than or equal to 25%, transverse breaking elongation is less than or equal to 25%, longitudinal tearing strength is more than 500N, transverse tearing strength is more than 400N, CBR bursting strength is more than 3200N, piercing strength is more than 500N, drop hammer penetration diameter is less than 9.0mm, equivalent aperture O is larger than equivalent aperture90Less than 0.2mm, and vertical permeability coefficient more than 2.0 × 10-3cm/s。
12. Use of the underwater foundation anti-scour bagged concrete according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112798458A (en) * | 2021-03-03 | 2021-05-14 | 中交上海三航科学研究院有限公司 | Method for testing loss rate of underwater foundation anti-scour dry-mixed material cement slurry |
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