CN116409960A - Concrete material, structure and simply supported box girder - Google Patents
Concrete material, structure and simply supported box girder Download PDFInfo
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- CN116409960A CN116409960A CN202211619491.9A CN202211619491A CN116409960A CN 116409960 A CN116409960 A CN 116409960A CN 202211619491 A CN202211619491 A CN 202211619491A CN 116409960 A CN116409960 A CN 116409960A
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- 239000004567 concrete Substances 0.000 title claims abstract description 124
- 239000000463 material Substances 0.000 title claims abstract description 119
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 30
- 239000011707 mineral Substances 0.000 claims abstract description 30
- 239000010881 fly ash Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 24
- 239000004575 stone Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims description 27
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims description 16
- 239000003513 alkali Substances 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 26
- 230000008569 process Effects 0.000 abstract description 20
- 238000013461 design Methods 0.000 abstract description 15
- 239000002994 raw material Substances 0.000 abstract description 11
- 238000005452 bending Methods 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 10
- 238000010276 construction Methods 0.000 description 17
- 239000000203 mixture Substances 0.000 description 15
- 239000004574 high-performance concrete Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000012615 aggregate Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012976 trial formulation Substances 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete materials, in particular to a concrete material, a structure and a simply supported box girder, which are prepared from raw materials such as cementing materials, mineral powder, fly ash, sand, broken stone, water, a water reducing agent and the like, wherein the concrete prepared from the concrete material can have higher bonding performance in the concrete use process, so that the change of deflection of a concrete girder structure with longer length in the use process of the girder structure prepared from the concrete material by a person in the field is stronger, the concrete material has stronger bending resistance after being prepared into a Liang Duandeng girder structure of a bridge, and further, a bridge girder section with longer length can be prepared, and the technical problem that the numerical change range of deflection, bending strength and the like of the girder section directly prepared from the concrete material cannot meet design requirements when the length of the girder section is more than 40m, such as the girder section with 64m or longer length is needed is solved.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to a concrete material, a structure and a simply supported box girder.
Background
In recent years, along with the rapid development of economic construction in China, the living standard of people is continuously improved, the investment is continuously increased in the construction of high-speed railways, expressways, inter-urban railways and urban rail transit in China, more and more bridges are newly built, and the construction process of segment prefabrication and assembly is widely adopted in the construction process of large-span bridges. The process of prefabricating the girder by sections is a construction process that the girder body is divided into a plurality of sections to be prefabricated in a factory, and then the prefabricated piers are integrally assembled into a bridge. Along with the continuous improvement of the scientific and technical level, the engineering which is not dared to be built in the past due to technology, construction capability and the like is gradually going from the idea to reality, and the continuous increase of construction difficulty and the continuous innovation of construction technology are caused. The engineering is also considered to be safely used within the design life while the engineering quality is ensured in construction, so that the material performance index used in the engineering structure is required to be higher and higher.
The bridge mainly comprises parts such as a foundation, a bearing platform, a pier, a beam section and the like. In order to promote the construction progress of the bridge and shorten the construction period, parts of the bridge pier and the Liang Duandeng are required to be prefabricated. The beam sections are mainly made of concrete material. When the length of the beam section is greater than 40m, if a beam section with the length of 64m or longer is required to be prepared, the beam section is directly prepared by adopting the related technology (such as a high-strength super-freezing-resistant dry hard concrete material disclosed in CN110105022B and a preparation method thereof), however, the variation range of the numerical values of the deflection, the bending strength and the like of the beam section made of the concrete material cannot meet the design requirement.
Disclosure of Invention
The main purpose of the invention is that: the concrete material, the structure and the simply supported box girder are provided, and the technical problem that the numerical variation range of deflection, bending strength and the like of a girder section made of the concrete material in the related technology cannot meet the design requirement is solved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a concrete material, which is prepared from a cementing material, mineral powder, fly ash, sand, broken stone, water and a water reducing agent, wherein the cementing material comprises cement, fly ash and mineral powder;
according to 1m 3 The mass of each component is as follows: 300 kg-500 kg of cementing material, 50kg of mineral powder, 50kg of fly ash, 667kg of sand, 1186kg of crushed stone, 140kg of water and 7.5kg of water reducer.
Alternatively, according to 1m 3 The mass of each component is as follows: 400kg of cement, 50kg of mineral powder, 50kg of fly ash, 667kg of sand, 1186kg of crushed stone, 140kg of water and 7.5kg of water reducer.
Optionally, the slump of the concrete material is S, wherein S is 160mm or more and 200mm or less.
Optionally, the water to gel ratio of the concrete material is not greater than 0.45.
Optionally, the chloride ion content in the concrete material is not more than 0.06% of the cementitious material content.
Alternatively, the alkali content per cubic volume of the concrete material is greater than 0 and less than 3kg.
Optionally, the content of sulfur trioxide in the concrete material is not more than 4.0% of the cement content.
Optionally, the 6h three-dimensional electric flux of the concrete material is greater than 0 and less than 1000C.
Based on the same inventive concept, the invention also provides a concrete structure which is made of the concrete material in the first aspect.
Based on the same inventive concept, in a third aspect, the invention also provides a simply supported box girder, comprising the concrete structure in the second aspect.
The one or more technical schemes provided by the invention can have the following advantages or at least realize the following technical effects:
according to the concrete material, the concrete material is prepared from the raw materials such as the cementing material, the mineral powder, the fly ash, the sand, the broken stone, the water and the water reducing agent, so that a person skilled in the art can have higher bonding performance in a concrete use process of the concrete prepared by using the concrete material, further, the change index of deflection of a concrete beam structure with a longer length prepared by using the concrete material is stronger in the use process of the beam structure, namely, the concrete material has stronger bending resistance after being prepared into a Liang Duandeng beam structure of a bridge, further, the person skilled in the art can prepare bridge beam sections with longer length, the technical defect that the concrete material in the related art cannot directly prepare bridge beam sections with at least 64m length is overcome, and further, the technical problem that when the length of the beam sections is more than 40m, the deflection of the beam sections prepared by directly adopting the concrete material in the related technology cannot meet the design change range of the bending strength and the like of the beam sections with the length of 64m or longer length is solved.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is to be noted that,
in the embodiment of the present invention, all directional indications (such as up, down, left, right, front, rear … …) are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a particular posture, and if the particular posture is changed, the directional indication is changed accordingly.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; the communication between the two elements can be realized, or the interaction relationship between the two elements can be realized.
In the present invention, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In the present invention, suffixes such as "module", "part" or "unit" used for representing elements are used only for facilitating the description of the present invention, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination.
The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. In addition, the technical solutions of the embodiments may be combined with each other, but it is based on the fact that those skilled in the art can implement the combination of the technical solutions, when the technical solutions contradict each other or cannot be implemented, the combination of the technical solutions should be considered as not existing and not falling within the protection scope of the present invention.
The technical idea of the present invention is further explained below in conjunction with some embodiments.
The invention provides a concrete material.
In one embodiment of the invention, the concrete material is prepared from a cementing material, mineral powder, fly ash, sand, broken stone, water and a water reducing agent, wherein the cementing material comprises cement, fly ash and mineral powder;
according to 1m 3 The concrete material calculation of (1) comprises the following components in mass: 300 kg-500 kg of cementing material, 50kg of mineral powder, 50kg of fly ash, 667kg of sand, 1186kg of crushed stone, 140kg of water and 7.5kg of water reducer.
In this embodiment, the concrete material is made from the raw materials such as the cementing material, the mineral powder, the fly ash, the sand, the crushed stone, the water and the water reducing agent, so that a person skilled in the art can have higher bonding performance in a specific use process of the concrete prepared by using the material of the invention, further, the change of the deflection of the concrete beam structure with longer length in the use process of the beam structure prepared by using the concrete material of the invention is stronger, that is, the concrete material of the invention has stronger bending resistance effect after being prepared into the Liang Duandeng beam structure of the bridge, further, the technical defect that the person skilled in the art cannot directly prepare the bridge beam section with longer length in the related art is overcome, and further, the technical problem that the change of the deflection, the strength and other numerical values of the beam section prepared by directly adopting the concrete material of the related art cannot meet the design requirement when the length of the beam section is greater than 40m, such as the beam section with 64m or longer length is required is solved.
In an exemplary embodiment, take as an example a 64m length beam section that needs to be used to make a railroad bridge: in the concrete implementation, firstly, the information such as the use environment of the beam section prepared by the concrete material and the strength of the concrete used by the beam section is determined according to the design requirement, and then the raw material composition of the concrete material and the concrete materials corresponding to the raw materials are determined according to the obtained information.
It is to be particularly clear and stated that in the present embodiment, the environment class of the use environment of the exemplary beam section is T2; the strength of the concrete was C60.
In some embodiments, the process is performed according to 1m 3 The concrete material calculation of (1) comprises the following components in mass: 400kg of cement, 50kg of mineral powder, 50kg of fly ash, 667kg of sand, 1186kg of crushed stone, 140kg of water and 7.5kg of water reducer.
In the present embodiment, at 1m 3 The concrete material is prepared according to 400kg of cement, 50kg of mineral powder, 50kg of fly ash, 667kg of sand, 1186kg of broken stone, 140kg of water and 7.5kg of water reducing agent, so that the concrete can effectively ensure the use effect of the concrete in concrete implementation.
In some exemplary embodiments, 1m 3 The amounts of concrete materials used and the corresponding parameters are shown in Table 1.
Table 1:
| mixing ratio | Cement and its preparation method | Fly ash | Mineral powder | Sand and sand | Broken stone | Water and its preparation method | Water reducing agent |
| The amount of material (DEGg/m) 3 ) | 400 | 50 | 50 | 667 | 1186 | 140 | 7.5 |
| Trial 30L (kg) | 12 | 1.5 | 1.5 | 20.01 | 35.58 | 4.2 | 0.225 |
As can be seen from Table 1, the concrete material prepared by the invention has good cohesiveness, good water retention and workability meeting construction requirements. It should be noted that: with an observed apparent density of 2500kg/m 3 。
In some embodiments, the slump of the concrete material is S, wherein 160 mm.ltoreq.S.ltoreq.200 mm.
In this embodiment, refer to table 2 for implementation.
Table 2:
in this embodiment, the performance data corresponding to the slump of the example is analyzed, so that the present invention can be configured to meet the performance requirements in specific implementation.
In some embodiments, the water to gel ratio of the concrete material is no greater than 0.45. The chloride ion content in the concrete material is not more than 0.06% of the cementing material content. The alkali content in each cubic concrete material is more than 0 and less than 3kg. The content of sulfur trioxide in the concrete material is not more than 4.0% of the content of the cementing material. The 6h three-dimensional electric flux of the concrete material is more than 0 and less than 1000 ℃.
In this embodiment, the concrete material is made from the raw materials such as the cementing material, the mineral powder, the fly ash, the sand, the crushed stone, the water and the water reducing agent, so that a person skilled in the art can have higher bonding performance in a specific use process of the concrete prepared by using the material of the invention, further, the change of the deflection of the concrete beam structure with longer length in the use process of the beam structure prepared by using the concrete material of the invention is stronger, that is, the concrete material of the invention has stronger bending resistance effect after being prepared into the Liang Duandeng beam structure of the bridge, further, the technical defect that the person skilled in the art cannot directly prepare the bridge beam section with longer length in the related art is overcome, and further, the technical problem that the change of the deflection, the strength and other numerical values of the beam section prepared by directly adopting the concrete material of the related art cannot meet the design requirement when the length of the beam section is greater than 40M, such as the beam section with 64M or longer length is required is solved.
In some specific embodiments, the concrete materials exemplified by the present invention will be described in detail with 400kg of the binder, and the concrete materials exemplified by the present invention will be described in detail with 300kg of the binder and 500kg of the binder as comparative examples, respectively;
in a specific embodiment, when the exemplary cementitious material is 400kg, the C60 high performance concrete mix is designed as follows:
design description: environmental category: t2; designing strength grade: c60; slump requirement: 180+ -20 (mm); the part to be used: passenger railway special lines and bridge engineering of a certain airport.
The conditions of raw materials are as follows: and (3) cement: p.o-52.5 low alkali cement; fly ash: class F class i; mineral powder: s95, performing control; fine aggregate: natural river sand; coarse aggregate: 5-20 (mm) of crushed stone, and two-stage grading; water: mixing water; water reducing agent: polycarboxylic acid high performance water reducer (retarding type).
The design process of the mixing proportion comprises the following steps:
1) Selecting a preliminary mixing ratio;
2) Calculating trial intensity:
fcu,o＝(60×1.15)＝69(Mpa)；
3) The technical requirements are as follows: and (3) transporting by adopting a concrete tank truck, wherein the maximum consumption of the cementing material is not more than 500kg/m < 3 > according to standard requirements, the minimum consumption of the cementing material is not less than 350kg/m < 3 >, and the water-cement ratio is not more than 0.45. The mixing amount of the fly ash and the mixing amount of the mineral powder replace the cement consumption according to an equivalent method, and the mixing amount of the fly ash and the mineral powder is 10 percent of the cementing material according to the durability requirement of the concrete.
Design parameters: please refer to table 3.
The main technical parameters are determined by determining the water-gel ratio and the dosage of the cementing material:
w/b= (0.53×0.95×1×52.5×1.10)/(69+0.53×0.20×0.95×1×52.5×1.10) =0.39. And the water-gel ratio value is determined to be 0.28 according to actual trial formulation, and the requirements of TB10424-2018 of the acceptance Standard for construction quality of railway concrete engineering are met.
The water consumption and the sand rate are selected by preliminarily determining that the water consumption of the undoped additive is mw0=206 kg/m3; taking the admixture with water reducing rate beta=32% and doping amount of 1.5%; concrete water usage is mw= mwo (1- β) =206× (1-32%) =140 kg/m3; determining cement and admixture amounts (mC and mF); mcco=140/0.28=500 kg/m3; the mixing amount of the fly ash is determined to be 10%, the mixing amount of the mineral powder is determined to be 10%, the mixing amount of the water reducer is determined to be 1.5%, and the respective dosages of the cement, the fly ash, the mineral powder and the water reducer are as follows: mc=500× (1-20%) =400 kg/m3; mfr=500×10% =50 kg/m3; mk=500×10% =50 kg/m3; mJS =500×1.5% =7.5 kg/m3.
And (3) calculating the aggregate consumption, namely calculating the concrete mixing ratio by adopting an assumed weight method, wherein the assumed weight is 2500kg/m < 3 >, and the sand rate is 36%.
mC+mF+mk+ms+mG+mJs+mw+＝2500㎏/m 3 ；
ms+mG＝1853kg/m3；
ms＝1853×36％＝667kg/m3；
mG＝1853-667＝1186kg/m3。
According to the above stated requirements, the preliminary compounding ratios are selected as shown in Table 4 below:
table 4:
trial and adjustment was performed according to the preliminary mix ratio, see table 5:
table 5:
| mixing ratio | Cement and its preparation method | Fly ash | Mineral powder | Sand and sand | Broken stone | Water and its preparation method | Water reducing agent |
| The amount of material (DEGg/m) 3 ) | 400 | 50 | 50 | 667 | 1186 | 140 | 7.5 |
| Trial 30L (kg) | 12 | 1.5 | 1.5 | 20.01 | 35.58 | 4.2 | 0.205 |
As is clear from Table 5, the concrete material prepared by the invention has good cohesiveness, good water retention and workability meeting the construction requirements. It should be noted that: with an observed apparent density of 2500kg/m 3 。
And determining the reference mixing ratio as by trial and error. See table 6:
table 6:
the water-gel ratio is increased and decreased by 0.02 according to the adjusted PHB-20190607-001 reference, and the sand ratio is increased and decreased by 1% respectively. After the water-gel ratio is reduced by 0.02, the dosage of the cementing material with calculated proportion is 538kg/m 3 (which is less than or equal to 500kg/m3 higher than the maximum cementing material limit value required by the standard), so the water-gel ratio test stirring is not carried out. On the basis of unchanged slump of the mixture, the mixture property test is carried out on the floating mixture ratio under the water-cement ratio, and 30L of the mixture is mixed together with the reference mixture ratio. The material amounts are shown in Table 7 below:
table 7:
the blend performance test was performed on the above blend ratios, and the test results are shown in table 8 below:
table 8:
test pieces of mechanical properties and durability of concrete are respectively prepared according to the prepared mixing proportion, and are shown in Table 9:
table 9:
the test result has the compounding ratio number of PHB-20190607-001, all performances meet the design and standard requirements, and the apparent density is 2500kg/m when the compounding ratio is calculated 3 The measured apparent density was 2500kg/m 3 The mixing proportion is the theoretical mixing proportion selected by a laboratory.
The amounts of PHB-20190607-001 blend materials are shown in Table 10 below.
Table 10:
the total alkali content of the concrete is calculated by the sum of alkali contents of cement, mineral powder, fly ash, water and water reducing agent, wherein the alkali content of the mineral admixture is calculated by the soluble alkali contained in the mineral admixture. The calculation results of the total alkali content of the concrete are shown in the following table:
calculating table of single concrete total alkali content (kg/m) 3 ) See table 11:
table 11:
the total chloride ion content in the concrete comprises the sum of chloride ions contained in cement, fly ash, mineral powder, water and a water reducing agent, and the sum is not more than 0.06% of the total amount of the cementing material. See table 12 below:
table 12:
the total sulfur trioxide content in the concrete comprises the sum of sulfur trioxide contained in cement, fly ash, mineral powder, fine aggregate, coarse aggregate, water and water reducer, and the total content of the sulfur trioxide is not more than 4.0 percent of the total amount of the cementing material. The following table 13:
table 13:
note that: 235.64mg/L in the water report is SO 42-content, and the converted SO3 content is [235.64 ]/32+16×4 ] × (32+16×3) =196.4 mg/L; the NaSO4 content in the report of the water reducer is 0.24 percent (calculated by fold solid content), and the converted SO3 content is 13.31× [0.24 × (23×2+32+16×4) ]× (32 + +16×3) 100=0.02% >.
The 28-day strength of the concrete reaches 119% of the design strength, and meets the regulations of TB10424-2018 in the quality acceptance Standard for railway concrete engineering construction; the 28-day strength of the concrete with the mixing ratio reaches 104% of the trial mixing strength, and meets the design requirement.
In the production process, the cement-cement ratio of the C60 high-performance concrete is low, the consumption of cementing materials is large, and the viscosity of the concrete is high. Therefore, the water content of the raw materials needs to be strictly controlled in the concrete production process. In order to ensure the production quality of concrete, the stirring time is properly prolonged, and the viscosity and the out-of-site slump are effectively controlled. The concrete should be spread out immediately after arriving at the site.
The high-strength high-performance concrete has high strength, high fluidity and high viscosity. In the actual construction process, the design of raw materials and mixing proportion is required to be paid attention to, and effective control is carried out. And the construction quality of high-performance concrete in production and transportation is ensured.
In a modified example, when the exemplary cement is 300kg, the C60 high performance concrete mix is designed as follows.
In yet another embodiment, when the exemplary cementitious material is 500kg, the C60 high performance concrete mix is designed as follows.
In the embodiment, when concrete is proportioned, corresponding raw materials are firstly detected, the materials are subjected to trial proportioning according to the dosage required by the standard calculation trial proportioning, after the performance and strength of the mixture meet the requirements, the water-cement ratio is respectively increased and decreased by 0.05, the water consumption is unchanged, and the sand rate is respectively increased and decreased by 1 percent
In some embodiments, since the calculated proportioned cement usage is 538kg/m 3 (greater than the standard required maximum cement limit value of 500kg/m 3) after the water to cement ratio is reduced by 0.02, no such water to cement ratio test mix is performed. And, after the water-gel ratio is increased by 0.02, the dosage of the calculated proportion cementing material is 467kg/m 3 The trial strength is 65.2Mpa in 28 days and is lower than 69Mpa in trial strength.
Based on the same inventive concept, the invention also provides a concrete structure, which is made of the concrete material of the first aspect.
In this embodiment, concrete having high strength can be prepared by using the method exemplified in the previous embodiment.
Based on the same inventive concept, in a third aspect, the invention also provides a simply supported box girder comprising the concrete structure of the second aspect.
The concrete material is prepared from the raw materials such as the cementing material, the mineral powder, the fly ash, the sand, the crushed stone, the water and the water reducing agent, so that a person skilled in the art can have higher bonding performance in a concrete use process by using the concrete material, further, the change of deflection of a concrete beam structure with longer length in the use process of the beam structure by using the concrete material is stronger, namely, the concrete material has stronger bending resistance after being prepared into a Liang Duandeng beam structure of a bridge, further, the technical defect that the person skilled in the art cannot directly prepare a bridge beam section with longer length at least 64M in the concrete material in the related art is overcome, and further, the technical problem that the change range of values such as deflection, bending strength and the like of the beam section which is directly prepared by adopting the concrete material in the related art cannot meet design requirements when the length of the beam section is larger than 40M, such as the beam section with 64M or longer length is required is solved.
It should be noted that, the foregoing reference numerals of the embodiments of the present invention are only for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments. The above embodiments are only optional embodiments of the present invention, and not limiting the scope of the invention, and all equivalent structures or equivalent processes using the content of the present invention under the inventive concept of the present invention, or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. The concrete material is characterized by being prepared from a cementing material, mineral powder, fly ash, sand, broken stone, water and a water reducing agent, wherein the cementing material comprises cement, fly ash and mineral powder;
according to 1m 3 The mass of each component is as follows: 300 kg-500 kg of cementing material, 50kg of mineral powder, 50kg of fly ash, 667kg of sand, 1186kg of crushed stone, 140kg of water and 7.5kg of water reducer.
2. The concrete material of claim 1, wherein the concrete material is 1m 3 The mass of each component is as follows: 400kg of cement, 50kg of mineral powder, 50kg of fly ash, 667kg of sand and crushing1186kg of stone, 140kg of water and 7.5kg of water reducer.
3. The concrete material of claim 2, wherein the concrete material has a slump of S, wherein 160mm ∈s ∈200mm.
4. The concrete material of claim 1, wherein the water to gel ratio of the concrete material is no greater than 0.45.
5. The concrete material of claim 4, wherein the chloride ion content of the concrete material is not greater than 0.06% of the cementitious material content.
6. The concrete material according to any one of claims 1 to 5, wherein the alkali content per cubic volume of the concrete material is greater than 0 and less than 3kg.
7. The concrete material according to any one of claims 1 to 5, wherein the content of sulfur trioxide in the concrete material is not more than 4.0% of the content of the cementitious material.
8. The concrete material of any one of claims 1 to 5, wherein the concrete material has a 6h three-dimensional electric flux of less than 1000C.
9. A concrete structure, characterized in that it is made of a concrete material according to any one of claims 1 to 8.
10. A simply supported box girder comprising the concrete structure of claim 9.
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| CN102059741A (en) * | 2010-11-05 | 2011-05-18 | 周志涛 | Preparation method of high-performance concrete |
| CN102173685A (en) * | 2011-02-14 | 2011-09-07 | 中国铁道科学研究院铁道建筑研究所 | Cast-in-place beam concrete composition for quick tensioning |
| CN103739254A (en) * | 2013-12-18 | 2014-04-23 | 青岛青建新型材料有限公司 | Underground anti-cracking and impermeable concrete with strength grade no more than C50 and preparation method thereof |
| CN108256245A (en) * | 2018-01-24 | 2018-07-06 | 叶寿春 | A kind of high performance concrete preparation method |
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- 2022-12-15 CN CN202211619491.9A patent/CN116409960A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059741A (en) * | 2010-11-05 | 2011-05-18 | 周志涛 | Preparation method of high-performance concrete |
| CN102173685A (en) * | 2011-02-14 | 2011-09-07 | 中国铁道科学研究院铁道建筑研究所 | Cast-in-place beam concrete composition for quick tensioning |
| CN103739254A (en) * | 2013-12-18 | 2014-04-23 | 青岛青建新型材料有限公司 | Underground anti-cracking and impermeable concrete with strength grade no more than C50 and preparation method thereof |
| CN108256245A (en) * | 2018-01-24 | 2018-07-06 | 叶寿春 | A kind of high performance concrete preparation method |
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