CN114134809B - UHPC bridge deck pavement structure and preparation method thereof - Google Patents
UHPC bridge deck pavement structure and preparation method thereof Download PDFInfo
- Publication number
- CN114134809B CN114134809B CN202111398562.2A CN202111398562A CN114134809B CN 114134809 B CN114134809 B CN 114134809B CN 202111398562 A CN202111398562 A CN 202111398562A CN 114134809 B CN114134809 B CN 114134809B
- Authority
- CN
- China
- Prior art keywords
- fiber
- uhpc
- layer
- mass
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- 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
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
-
- 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)
- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of road engineering, in particular to a UHPC bridge deck pavement structure and a preparation method thereof. The paving structure comprises a paving unit, wherein the paving unit comprises a UHPC layer, an interlayer adhesive layer, a long fiber layer, a grid cloth layer and an interlayer adhesive layer which are sequentially arranged, the paving unit circulates for a plurality of times, and finally, the UHPC layer is used for sealing. The invention abandons the use mode of mixing, conveying and paving the fiber and the mortar together by the traditional UHPC, introduces the short fiber and the long fiber into the UHPC, adjusts the adding time and the adding mode of the two size fibers, and realizes the one-time improvement of the toughness of the UHPC on the premise of not increasing the construction difficulty by pre-mixing the short fiber and the UHPC mortar.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a UHPC bridge deck pavement structure and a preparation method thereof.
Background
UHPC has the characteristics of ultra-compactness, high specific strength and high toughness, can pointedly solve the problem of frequent fatigue disease occurrence of steel bridge deck boards in China and frequent damage of traditional asphalt pavement, has wide application prospect in the field of orthotropic steel bridge deck pavement, but has a plurality of technical problems in the prior pavement materials, structures and preparation methods, and restricts the large-scale application of the materials.
The UHPC pavement of the steel bridge deck adopts a structural scheme with the thickness of 5-10cm, the width of 10-30m and the length of 500-2000m and no expansion joint, and in order to avoid the cracking of the large-size sheet UHPC pavement structure, the prior art adopts a dense reinforcement, and the typical value of the spacing between the reinforcing bars is 37.5 multiplied by 37.5mm. The too small distance between the reinforcing steel bars limits the aggregate size, the fiber doping amount, the fiber length and the like in the UHPC, is unfavorable for the dense pouring of the UHPC mixture, and restricts the improvement of the material performance; the steel bar mesh is complex in site binding and welding procedures, so that the construction efficiency is greatly reduced; meanwhile, the reinforcing mesh structure is extremely easy to generate diseases, and huge hidden trouble is brought to later maintenance.
The prior construction technology stirs the fiber and the mixture together, and paves the fiber and the mixture to a construction surface after the stirring is finished. In order to reduce the difficulty of UHPC mixing, conveying, paving and other construction links, the fiber length is limited to be within 15mm, and the fiber volume doping amount is up to 2%; because of the density difference between the fiber and the UHPC mixture, sedimentation is easy to cause, the Yi Wanqu fiber deforms and disperses unevenly during mixing, the binding force between the fiber and the UHPC material is weak, and finally the comprehensive utilization rate of the fiber is low, so that the further improvement of the UHPC toughness is limited. The prior art condition can not solve the contradiction between the length and the mixing amount of UHPC fibers in the steel bridge deck pavement and the construction process such as mixing, reinforcing steel bar net pavement and the like, and the crack resistance and the toughness of the UHPC pavement structure are insufficient.
Disclosure of Invention
Aiming at the technical problems, the invention provides a UHPC composite structure which is formed by paving UHPC layers, long fiber layers, interlayer adhesives and fiber mesh cloth for multiple times by adopting a layering method, so that the problems of limited fiber length and doping amount in the preparation process of UHPC by a mixing method are solved, the contradiction between the toughness of UHPC, a paving structure and a construction process is solved, and finally the UHPC composite material and the structure suitable for bridge deck pavement are provided.
The invention adopts the following technical scheme:
the UHPC bridge deck pavement structure comprises a plurality of pavement units, wherein each pavement unit comprises a UHPC layer, an interlayer adhesive layer, a long fiber layer, a grid cloth layer and an interlayer adhesive layer which are sequentially arranged, and the pavement units circulate for a plurality of times and are sealed with the UHPC layer.
Preferably, the thickness of the UHPC layer is 5mm-10mm.
Preferably, the interlayer binder layer is selected from the group consisting of water-soluble aluminosilicate sols having the following structure:
wherein n is selected from 1-50, pH is 10-14, and solid content is 30-50%.
Preferably, the long fibers of the long fiber layer are profiled steel fibers, the fiber length is 20mm-200mm, the fiber diameter is 0.1mm-2mm, and the fiber density of the long fibers is 7000-8000kg/m 3 The spreading amount of the long fibers in each paving unit is 0.7kg/m 2 -16kg/m 2 . The long fibers may be selected from steel fibers and the like.
Preferably, the mesh cloth layer is a fiber mesh cloth, the fiber is one or more selected from glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber, basalt fiber and carbon fiber, the fiber monofilament diameter is 0.1mm-1mm, and the unit gram weight is 80g-200g/m 2 The mesh size of the mesh cloth layer is 5mm-10mm.
Preferably, the UHPC layer comprises 1500-2800 parts by mass of dry blend and 50-180 parts by mass of short fibers, wherein the short fibers are flat fibers with a fiber length of 2-10 mm, a diameter of 0.1-0.5 mm, and a density of 0.8g/cm 3 -3.0g/cm 3 . The fibres may therefore be selected from one or more of glass fibres, polypropylene fibres, basalt fibres, polyvinyl alcohol fibres.
The UHPC layer further comprises 90 to 240 parts by mass of water.
Preferably, the dry blend comprises 600-1200 parts by mass of premixed powder, 800-1400 parts by mass of aggregate and 100-200 parts by mass of thixotropic regulator;
the premixed powder comprises 350-700 parts by mass of cementing material, 180-400 parts by mass of admixture, 10-50 parts by mass of size stabilizer and 10-50 parts by mass of powder water reducer.
Preferably, the aggregate comprises artificial aggregate and natural aggregate, the particle size range of the aggregate is 0.15-5mm, and the continuous grading accords with the full maximum density curve equation;
the gel material is selected from one or more of silicate cement, aluminate cement, sulphoaluminate cement and phosphate cement;
the admixture is one or more selected from silica fume, fly ash, slag powder, limestone powder, glass powder and steel slag powder;
the size stabilizer is one or more selected from calcium sulfoaluminate and calcium oxide;
the powder water reducer is one of polycarboxylic acid and polyether.
Preferably, the thixotropic regulator is selected from one or more of montmorillonite with lamellar structure, organic bentonite and modified clay.
The preparation method of the UHPC bridge deck pavement structure comprises the following steps:
(1) Stirring the dry mixed material and water into a uniform fluid;
(2) Putting the short fibers into the fluid in the step (1), and continuing stirring until UHPC layer spreading is formed;
(3) Uniformly paving the UHPC layer pavement in the step (2) on a bridge deck, wherein the thickness is 5mm-10mm;
(4) Coating an interlayer adhesive on the surface of the step (3) to form an interlayer adhesive layer, wherein the coating amount is 0.2kg/m 2 -2.0kg/m 2 Uniformly spreading long fibers on the interlayer adhesive;
(5) Paving fiber gridding cloth on the surface of the long fiber in the step (4);
(6) Coating the interlayer adhesive again on the surface of the fiber mesh cloth in the step (5), wherein the coating amount is 0.2-2.0kg/m 2 ；
(7) And (3) alternately repeating the steps (3), (4), (5) and (6), and then paving a layer of UHPC layer pavement, so as to finally form the UHPC bridge deck pavement structure with the target thickness.
Advantageous effects
(1) The invention abandons the use mode of mixing, conveying and paving the fiber and the mortar together by the traditional UHPC, introduces the short fiber and the long fiber into the UHPC, adjusts the adding time and the adding mode of the two size fibers, and the short fiber and the UHPC mortar are mixed in advance to realize one-time improvement of the toughness of the UHPC on the premise of not increasing the construction difficulty, and the long fiber layer arranged between the UHPC layer paving materials further improves the fiber mixing amount in the UHPC paving structure, optimizes the fiber orientation, improves the effective utilization rate of the fiber, and can repeatedly pave the UHPC layer paving materials and the long fiber for a plurality of times according to the paving design thickness, so that the finally formed UHPC composite structure more meets the crack resistance requirement of bridge deck pavement.
(2) The invention adopts the form of multi-layer paving of two-dimensional fiber gridding cloth to replace one-time paving of three-dimensional reinforcing steel bar net. The complex binding and welding work of the reinforcement mesh on site is avoided, the problem of UHPC paving durability caused by corrosion of the reinforcement mesh is solved, and the problem of UHPC pouring compactness caused by close-fitting of the reinforcement mesh is solved; the two-dimensional fiber gridding cloth further improves the toughness of the UHPC structure in the transverse bridge direction and the longitudinal bridge direction, and meets the requirement of bridge deck pavement on the crack resistance of the UHPC structure.
(3) According to the invention, an interlayer adhesive is introduced between the UHPC layer spreading material and the long fiber and fiber mesh cloth, and the condensation reaction between the silica oligomer in the interlayer adhesive and the silica and alumina oligomer generated by cement hydration and the nucleation of the silica oligomer in the interlayer adhesive on the fiber surface are utilized, so that the adhesion between the UHPC layer spreading material and the long fiber and fiber mesh cloth and the adhesion between the UHPC layer spreading material are greatly improved, and the firm adhesion between layers of the UHPC composite structure is finally ensured.
(4) According to the invention, polymer groups or silicon dioxide in the thixotropic regulator are respectively used for forming bonding hydrogen bonds with the mixture or forming a three-dimensional grid structure through intermolecular acting force, the hydrogen bonds and the three-dimensional grid structure are invalid due to external force in the stirring and conveying processes, the mixture has good fluidity, after the external force is eliminated, the hydrogen bonds and the three-dimensional grid structure are reformed, the flocculation structure of the material is ensured not to be dispersed and has anti-flowing property, the problems of mixture segregation, layering and the like are solved, and finally, the UHPC layer paving material is ensured to more meet the use requirements of the composite structure created by the invention.
(5) The invention further investigates the distinction between layering and one-time layering in place, thereby determining the optimal layering scheme.
Drawings
FIG. 1 is a schematic diagram of a UHPC construction for deck pavement.
FIG. 2A microscopic electron micrograph of the bonding of the interlayer adhesive of example 1.
FIG. 3 is a microscopic electron micrograph of comparative example 6 without interlayer adhesive.
Fig. 4 is a microscopic electron microscopic image of the bonding using the conventional adhesive of comparative example 7.
1-UHPC layer; 2-an interlayer adhesive layer; 3-a long fiber layer; 4-is a fiber mesh cloth layer; n represents the repetition number of the pavement structure.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. 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.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
As shown in fig. 1, which is a schematic diagram of a UHPC bridge deck pavement structure according to an embodiment of the present invention, it can be seen from the figure that the pavement structure includes a plurality of pavement units, where the pavement units include a UHPC layer 1, an interlayer adhesive layer 2, a long fiber layer 3, a mesh cloth layer 4, and an interlayer adhesive layer 2, which are sequentially disposed from bottom to top, and the pavement units circulate multiple times, and finally seal the layer with the UHPC layer 1.
The present invention is described in detail below with reference to examples to facilitate understanding of the present invention by those skilled in the art.
Example 1
The utility model provides a UHPC bridge deck pavement structure, pavement structure includes a plurality of pavement units, pavement unit includes from down upwards setting gradually UHPC layer 1, interlayer binder layer 2, long fiber layer 3, net cloth layer 4, interlayer binder layer 2, pavement unit circulation many times, finally with UHPC layer 1 seal.
The components in each paving unit are as follows:
the UHPC layer material comprises 2500 parts by mass of dry blend, 100 parts by mass of short fiber and 200 parts by mass of water; the total mass of the adhesive layers between the two layers is 80 parts by mass; the long fiber layer is 250 parts by mass; the mesh cloth layer is 50 parts by mass.
The dry mixed material consists of 1200 parts by mass of premixed powder, 1200 parts by mass of aggregate and 100 parts by mass of thixotropic regulator.
The premixed powder consists of 700 parts by mass of Portland cement, 150 parts by mass of fly ash, 100 parts by mass of slag powder, 150 parts by mass of limestone powder, 50 parts by mass of water reducer and 50 parts by mass of size stabilizer.
The size stabilizer is calcium sulfoaluminate with a specific surface area of 278m 2 The limiting expansion ratio 21d was 0.011%.
The aggregate is natural aggregate, the grain diameter range is 0.15-3mm, and the continuous grading accords with the full density curve equation of the FULLER and the close-packed void ratio is 30%.
The thixotropic regulator is organic bentonite powder with lamellar structure and has a density of 1.7g/cm 3 Zeta potential value-0.08 mV.
The short fiber consists of glass fiber with the length of 8mm and the diameter of 0.2mm and polypropylene fiber with the length of 10mm and the diameter of 0.1 mm.
The long fibers are end hook steel fibers with the length of 50mm and the diameter of 1 mm.
The interlayer adhesive is water-soluble aluminosilicate sol formed by polycondensation of a silicon-oxygen oligomer and an aluminum-oxygen oligomer, and has a polymerization degree of 10, a pH value of 11 and a solid content of 35%. The solids content refers to the mass of aluminosilicate/mass of water-soluble aluminosilicate sol.
The aluminosilicate has the formula:
the fiber of the mesh cloth consists of glass fiber, and the mesh size8mm, 2mm fiber monofilament with unit gram weight of 120g/m 2 。
According to the raw materials and the components, the UHPC pavement structure is prepared by adopting the following method:
(1) 600 parts by mass of Portland cement, 150 parts by mass of fly ash, 220 parts by mass of slag powder, 150 parts by mass of limestone powder, 30 parts by mass of water reducer, 50 parts by mass of size stabilizer, 1250 parts by mass of aggregate, 100 parts by mass of thixotropic regulator and 200 parts by mass of water are mixed and stirred into a uniform fluid.
(2) Adding 100 parts by mass of short fibers into the fluid in the step (1), and continuously stirring to form UHPC layer spreading;
(3) Uniformly paving the UHPC layer pavement in the step (2) on a bridge deck, wherein the thickness is 5mm, and forming a UHPC layer 1 as shown in figure 1;
(4) The surface of UHPC layer 1 in step (3) was coated with interlayer adhesive 2 in an amount of 1.5kg/m 2 Forming an interlayer adhesive layer 2 as shown in fig. 1, uniformly spreading long fibers on the interlayer adhesive to form a long fiber layer 3;
(5) In the step (4), a mesh cloth is laid on the surface of the long fiber layer 3, and the spreading amount of the long fibers is 10kg/m 2 Forming a grid cloth layer 4;
(6) In the step (5), the surface of the fiber mesh cloth is coated with interlayer adhesive again, wherein the coating amount is 1.5kg/m 2 Forming an interlayer adhesive layer 2;
(7) Alternately repeating the steps (3), (4), (5) and (6) to form a composite structure, and finally obtaining the UHPC layer 1 sealing layer with the preset thickness of 50mmA kind of electronic deviceUHPC bridge deck pavement structure.
The mixer model is DEX vertical shaft planetary mixer, the motor is 110kW, the maximum current is 210A, overload protection is arranged, and the motor is automatically stopped when the current exceeds the limit.
Relevant parameters for the paving of UHPC layers prepared according to the formulation of UHPC layers defined in the present invention are as follows: density of 2.0-3.0g/cm 3 The viscosity is 3-8 Pa.s at 60-120rpm, 10-15 Pa.s at 6-12rpm, and the initial setting time is 100-500min.
Example 2
The utility model provides a UHPC bridge deck pavement structure, pavement structure includes a plurality of pavement units, pavement unit includes from down upwards setting gradually UHPC layer 1, interlayer binder layer 2, long fiber layer 3, net cloth layer 4, interlayer binder layer 2, pavement unit circulation many times, finally with UHPC layer 1 seal.
The components in each paving unit are as follows:
the UHPC layer comprises 1500 parts by mass of dry mixed material, 50 parts by mass of short fiber and 90 parts by mass of water;
the long fiber layer comprises 400 parts by mass of long fibers; the interlayer adhesive layer includes 150 parts by mass of an interlayer adhesive; the mesh cloth layer comprises 70 parts by mass of fiber mesh cloth.
The dry mixed material consists of 600 parts by mass of premixed powder, 800 parts by mass of aggregate and 100 parts by mass of thixotropic regulator.
The premixed powder consists of 350 parts by mass of silicate cement, 50 parts by mass of fly ash, 80 parts by mass of slag powder, 50 parts by mass of silica fume, 10 parts by mass of water reducer and 10 parts by mass of size stabilizer.
The size stabilizer is calcium sulfoaluminate with a specific surface area of 278m 2 The limiting expansion ratio 21d was 0.011%.
The aggregate is natural aggregate, the grain diameter range is 0.15-3mm, and the continuous grading accords with the full density curve equation of the FULLER and the close-packed void ratio is 30%.
The thixotropic regulator is organic bentonite powder with lamellar structure and has a density of 1.7g/cm 3 Zeta potential value-0.08 mV.
The short fibers consist of basalt fibers with the length of 8mm and the diameter of 0.2mm and polyvinyl alcohol fibers with the length of 2mm and the diameter of 0.1 mm.
The long fibers are twisted steel fibers with the length of 20mm and the diameter of 0.5 mm.
The interlayer adhesive is water-soluble aluminosilicate sol formed by polycondensation of a silicon-oxygen oligomer and an aluminum-oxygen oligomer, and has a polymerization degree of 10, a pH value of 11 and a solid content of 35%.
The mesh cloth is fiber mesh cloth, the fibers consist of basalt fibers, the mesh size is 5mm, the fiber monofilaments are 0.1mm, and the single fiber is singleBit gram weight of 100g/m 2 。
According to the raw materials and the components, the UHPC pavement structure is prepared by adopting the following method:
(1) 500 parts by mass of Portland cement, 100 parts by mass of fly ash, 200 parts by mass of slag powder, 100 parts by mass of silica fume, 50 parts by mass of water reducer, 50 parts by mass of size stabilizer, 1400 parts by mass of aggregate, 100 parts by mass of thixotropic regulator and 90 parts by mass of water are mixed and stirred into a uniform fluid.
(2) Adding 120 parts of short fibers into the fluid in the step (1), and continuously stirring to form UHPC layer spreading;
(3) Uniformly paving the UHPC layer pavement in the step (2) on a bridge deck, wherein the thickness is 5mm, and forming a UHPC layer 1 as shown in figure 1;
(4) Coating the interlayer adhesive on the surface of the layer pavement in the step (3), wherein the coating amount is 2.0kg/m 2 Forming an interlayer adhesive layer 2 as shown in FIG. 1, uniformly spreading long fibers on the interlayer adhesive, wherein the spreading amount of the long fibers is 0.7kg/m 2 Forming a long fiber layer 3 as in fig. 1;
(5) Paving fiber gridding cloth on the surface of the long fiber layer 3 in the step (4) to form a gridding cloth layer 4 as shown in fig. 1;
(6) In the step (5), the surface of the mesh cloth layer 4 is coated with an interlayer adhesive again, the coating amount is 2.0kg/m 2 Forming an interlayer adhesive layer 2 again;
(7) Alternately repeating the steps (3), (4), (5) and (6) to form a composite structure, and finally obtaining the UHPC layer 1 sealing layer with the preset thickness of 55mmA kind of electronic deviceUHPC bridge deck pavement structure.
The UHPC bridge deck pavement structure prepared in the example 2 is evaluated, the mechanical property test is to mold a simulated composite structure in a room, the size of the simulated composite structure is 1m multiplied by 10cm, the preparation method is as shown above, cutting and sampling are carried out according to the specified size after curing is finished, and the test is carried out according to GB/T31387. The long-term performance and durability test is referred to GB/T50082 standard test method, and the results are shown in Table 1.
Table 1 example 2 results of performance test
Example 3
The utility model provides a UHPC bridge deck pavement structure, pavement structure includes a plurality of pavement units, pavement unit includes from down upwards setting gradually UHPC layer 1, interlayer binder layer 2, long fiber layer 3, net cloth layer 4, interlayer binder layer 2, pavement unit circulation many times, finally with UHPC layer 1 seal.
The components in each paving unit are as follows:
the UHPC layer comprises 2800 parts by mass of dry mixed material, 180 parts by mass of short fiber and 240 parts by mass of water; the long fiber layer comprises 300 parts by mass of long fibers; the interlayer adhesive layer includes 100 parts by mass of an interlayer adhesive; the mesh cloth layer comprises 30 parts by mass of fiber mesh cloth.
The dry mixed material consists of 1200 parts by mass of premixed powder, 1400 parts by mass of aggregate and 200 parts by mass of thixotropic regulator.
The premixed powder consists of 700 parts by mass of silicate cement, 100 parts by mass of fly ash, 100 parts by mass of slag powder, 100 parts by mass of silica fume, 100 parts by mass of limestone powder, 50 parts by mass of water reducer and 50 parts by mass of size stabilizer.
The size stabilizer is calcium oxide with specific surface area of 240m 2 The limiting expansion ratio 21d was 0.011%.
The aggregate is artificial aggregate, the grain diameter range is 0.15-4mm, and the continuous grading accords with the full maximum density curve equation of the FULLER and the close-packed void ratio is 35%.
The thixotropic regulator is organic bentonite powder with lamellar structure and has a density of 1.7g/cm 3 Zeta potential value-0.08 mV.
The short fibers consist of glass fibers with the length of 10mm and the diameter of 0.2mm, basalt fibers with the length of 10mm and the diameter of 0.2mm and polyvinyl alcohol fibers with the length of 8mm and the diameter of 0.1 mm.
The long fiber consists of an end hook steel fiber with the length of 200mm and the diameter of 2mm and a twisted steel fiber with the length of 100mm and the diameter of 0.1 mm.
The interlayer adhesive is water-soluble aluminosilicate sol formed by polycondensation of a silicon-oxygen oligomer and an aluminum-oxygen oligomer, and has a polymerization degree of 10, a pH value of 11 and a solid content of 35%.
The fiber mesh cloth consists of basalt fibers, the mesh size is 5mm, the fiber monofilaments are 0.2mm, and the unit gram weight is 100g/m 2 。
The composite structure formed by the UHPC composite material and the preparation method thereof comprise the following steps:
(1) 500 parts by mass of Portland cement, 80 parts by mass of fly ash, 100 parts by mass of slag powder, 20 parts by mass of silica fume, 100 parts by mass of limestone powder, 50 parts by mass of water reducer, 50 parts by mass of dimensional stabilizer, 1000 parts by mass of aggregate, 100 parts by mass of thixotropic regulator and 240 parts by mass of water are mixed and stirred into a uniform fluid.
(2) Putting 150 parts by mass of short fibers into the fluid in the step (1), and continuously stirring to form UHPC layer spreading;
(3) Uniformly paving the UHPC layer pavement in the step (2) on a bridge deck, wherein the thickness is 10mm, and forming a UHPC layer 1 in the figure 1;
(4) The surface of UHPC layer 1 in (3) was coated with an interlayer adhesive in an amount of 1.0kg/m 2 Forming an interlayer adhesive layer 2 as shown in FIG. 1, uniformly spreading long fibers on the interlayer adhesive, the spreading amount of the long fibers being 16kg/m 2 Forming a long fiber layer 3 as in fig. 1;
(5) Laying fiber mesh cloth on the surface of the long fiber layer 3 in the step (4) to form a mesh cloth layer 4 as shown in fig. 1;
(6) The surface of the fiber mesh cloth is coated with the interlayer adhesive again in the step (5), and the coating amount is 1.0kg/m 2 Forming an interlayer adhesive layer 2 as in fig. 1;
(7) And (3) alternately repeating the steps (3), (4), (5) and (6) to form a composite structure, and finally, sealing the layer by using the UHPC layer 1 to finally obtain the UHPC bridge deck pavement structure with the preset thickness of 60 mm.
The UHPC bridge deck pavement structure prepared in the example 3 is evaluated, the mechanical property test is to mold a simulated composite structure in a room, the size of the simulated composite structure is 1m multiplied by 10cm, the preparation method is as shown above, cutting and sampling are carried out according to the specified size after curing is finished, and the test is carried out according to GB/T31387. The long-term performance and durability test is referred to GB/T50082 standard test method, and the results are shown in Table 2.
Table 2 example 3 results of performance test
Comparative example 1
The difference from example 1 is that the dry mix has no thixotropic conditioning agent, the other materials and amounts and preparation methods are exactly the same, and the comparative example gives a pavement structure having the same total thickness as example 1.
The bridge deck pavement-related structures prepared in example 1 and comparative example 1 were evaluated, and the mixing current and fiber distribution of the UHPC layer pavement obtained in step (2) of example 1 and comparative example 1 were observed on site, as shown in the following tables, respectively.
The working performance of the UHPC paving structure is carried out according to the standard, the mechanical performance test is carried out by molding a simulated composite structure in a room, the size of the simulated composite structure is 1m multiplied by 10cm, the steps are the same as those in the example 1, the cutting sampling is carried out according to the specified size after the curing of the paving structure finally obtained in the example 1 and the comparative example 1 is finished, the test is carried out according to GB/T31387, and the results are shown in the columns 4-6 of the table 3.
TABLE 3 results of Performance test of example 1 and comparative example 1
As can be seen from Table 3, comparative example 1 has no thixotropic regulator, the UHPC layer is relatively high in flow, resulting in poor layering effect, relatively obvious fiber layering, insufficient toughness, and high shrinkage value due to fiber constraint and counteracting stress drop.
Comparative example 2
The difference from example 1 is that the UHPC bridge deck pavement structure has no long fiber layer, other raw materials, the dosage and the preparation method are completely the same, and the total thickness of the pavement structure obtained by the comparative example is the same as that of example 1.
The UHPC bridge deck pavement structures prepared in the example 1 and the comparative example 2 are evaluated, the mechanical property test is to mold a simulated composite structure in an indoor space, the size of the simulated composite structure is 1m multiplied by 10cm, the preparation method is the same as that of the example 1, the final pavement structures prepared in the example 1 and the comparative example 2 are cut and sampled according to the specified size after maintenance, and the test is performed by referring to GB/T31387. The long-term performance and durability test is referred to GB/T50082 standard test method, and the results are shown in Table 4.
Table 4 results of the performance tests of example 1 and comparative example 2
As is clear from Table 4, in comparative example 2, the specimen of the pavement structure obtained had no long fibers, and therefore, the specimen had significantly reduced flexural strength and axial tensile strength, and no decrease in toughness of the long fiber material, significantly increased shrinkage value, and decreased fracture toughness.
Comparative example 3
The long fibers in the example 1 are modified into end hook steel fibers with the length of 30mm and the diameter of 2mm, other raw materials, the dosage and the preparation method are completely the same, and the total thickness of the paving structure obtained in the comparative example is the same as that of the example 1.
The bridge deck pavement structures prepared in example 1 and comparative example 3 were evaluated, and the mechanical property test was performed by molding a simulated composite structure having a size of 1m×1m×10cm in a room, and the molding procedure was the same as that in example 1, and cutting and sampling were performed according to a predetermined size after curing the final pavement structures of example 1 and comparative example 3, and the test was performed with reference to GB/T31387. Adopting a FALCON500 full-automatic Vickers hardness tester to test microhardness of the interlayer bonding part, and polishing and preparing samples according to requirements; the fiber to mat pull-out strength was tested by the single fiber pull-out test method with reference to GB/T14337 and the results are shown in Table 5.
TABLE 5 results of Performance test of example 1 and comparative example 3
From the results, it was found that the toughening and reinforcing effects were weaker than those of example 1 by using shorter fibers, and the maximum effect could not be exerted.
Comparative example 4
The long fibers in the example 1 are modified into end hook steel fibers with the length of 400mm and the diameter of 1mm, other raw materials, the dosage and the preparation method are completely the same, and the total thickness of the paving structure obtained in the comparative example is the same as that of the example 1.
The bridge deck pavement structures prepared in example 1 and comparative example 4 were evaluated, and the mechanical property test was performed by molding a simulated composite structure having a size of 1m×1m×10cm in a room, and the molding procedure was the same as that in example 1, and the final pavement structures of example 1 and comparative example 4 were cut and sampled to a predetermined size after curing, and were tested with reference to GB/T31387. Adopting a FALCON500 full-automatic Vickers hardness tester to test microhardness of the interlayer bonding part, and polishing and preparing samples according to requirements; the fiber to mat pull-out strength was tested by the single fiber pull-out test method with reference to GB/T14337 and the results are shown in Table 6.
Table 6 results of the performance tests of example 1 and comparative example 4
The comparative example shows that the spreading of the long fibers has no obvious enhancement of the effect and has a certain degradation tendency, because the spreading of the long fibers needs to rely on mechanical vibration, the fiber orientation can be influenced by the long fibers, and the fibers cannot exert a toughening effect in the acting force direction.
Comparative example 5
The difference from example 1 is that steps (1) and (2) introduce long fibers to mix together when preparing the UHPC layer mat. The amount of the long fibers introduced was 250 parts by mass, the long fibers were end-hook type fibers having a length of 50mm and a diameter of 1mm,
in the experimental operation process, after the UHPC dry mixed material, water and short fibers are stirred into a fluid state, the instantaneous current of the mixer exceeds 210A after the long fibers are put into the mixer, the mixer starts overload protection measures, and the mixing fails.
Comparative example 6
The difference from example 1 is that the whole paving structure of the UHPC has no interlayer adhesive layer, other raw materials, other dosage and the preparation method are completely the same, and the total thickness of the paving structure obtained by the comparative example is the same as that of example 1.
Comparative example 7
The difference from example 1 is that the interlayer binder in the UHPC pavement structure adopts a conventional adhesive, which is water-based epoxy resin, and the other raw materials, the dosage and the preparation method are completely the same, and the total thickness of the pavement structure obtained in the comparative example is the same as that of example 1.
The bridge deck pavement structure methods prepared in example 1 and comparative examples 6 and 7 were evaluated, and the mechanical property test required molding of a simulated composite structure in a room, the dimensions of which were 1m×1m×10cm, the molding procedure was the same as in example 1, cutting and sampling were performed according to the specified dimensions after curing was completed, and the test was performed with reference to GB/T31387. Adopting a FALCON500 full-automatic Vickers hardness tester to test microhardness of the interlayer bonding part, and polishing and preparing samples according to requirements; the fiber to mat pull-out strength was tested by the single fiber pull-out test method with reference to GB/T14337 and the results are shown in Table 7.
Table 7 results of performance tests of example 1 and comparative examples 6 and 7
From Table 7, it can be seen that the composite structural test pieces incorporating the aluminosilicate sol interlayer binder have better macroscopic mechanical properties. Observing the microscopic level of adhesion of example 1, comparative example 6 and comparative example 7, as shown in fig. 2-4, the interlayer adhesive of example 1 enhances the bonding force between the ply-bonding materials, as shown in fig. 2, and the interlayer adhesive can serve as nucleation sites for hydration products on the fibers, and hydration products exist on the surfaces of the fibers as verified by micromechanics test; the traditional adhesive only has the adhesive effect, forms a film outside the fiber, is easy to slip off and has poor effect, as shown in figure 3. Comprehensive performance tests and microscopic analysis prove that the preferable aluminosilicate sol enhances the binding force between the fiber and the layer pavement, and the microhardness and the fiber extraction strength are obviously improved.
Comparative example 8
The difference from example 1 is that the UHPC paving structure has no grid cloth layer, other raw materials, the dosage and the preparation method are completely the same, and the total thickness of the paving structure obtained by the comparative example is the same as that of example 1.
Comparative example 9
The UHPC pavement structure adopts a traditional reinforcing steel mesh layer.
The traditional reinforcing mesh layer isHot rolling ribbed steel bars, wherein the transverse and longitudinal spacing is 50X 50mm;
the laying method comprises the following steps: binding and welding a reinforcing steel bar net, 20mm away from the bridge deck, paving a UHPC layer to the reinforcing steel bar net, wherein the thickness is 20mm, spreading a long fiber layer, the type and the amount of the used fiber of the long fiber layer are equal to those of the fiber in one paving unit in the embodiment 1, then coating 40 parts by mass of an interlayer adhesive layer, and paving the UHPC layer again to the preset thickness of 50mm for 20 mm;
comparative example 10
The UHPC layer paving material composition and the preparation method are the same as those of the embodiment 1, and the paving method comprises the steps of sequentially paving the UHPC layer formed by the layer paving material into a thickness of 25mm, a long fiber layer, an interlayer adhesive layer and a fiber grid cloth layer, wherein the interlayer adhesive layer and the UHPC layer are formed into a thickness of 25mm, and paving the UHPC layer to a preset thickness of 50mm; wherein the long fiber layer, the interlayer adhesive layer, and the fiber mesh cloth layer were the same as in example 1.
The bridge deck pavement structures prepared in example 1 and comparative examples 8, 9 and 10 were evaluated, and the mechanical property test required that a simulated composite structure of 1m×1m×10cm was molded in a room, and the molding procedure was the same as that in example 1, and after curing, cut samples were taken at a predetermined size and tested with reference to GB/T31387. The long-term performance and durability test is referred to GB/T50082 standard test method, and the results are shown in Table 8.
Table 8 results of performance tests of example 1 and comparative example 8, comparative example 9, comparative example 10
As can be seen from the data in the table, the mechanical properties of the composite structural test piece without the fiber mesh cloth are lower than those of the test piece in the embodiment 1, the long-term durability is lower than that of the test piece laid by the traditional reinforcing steel bar mesh, the toughness is extremely low, the durability is poor, and the reinforcing steel bar mesh cannot exert the toughening and cracking resistance effects. The single-layer fiber mesh cloth plays a certain role in toughening; in the embodiment 1, the multi-layer composite structure provided by the invention is adopted, the fiber mesh cloth plays a role in toughening in the UHPC composite structure, and can eliminate the internal temperature stress and shrinkage stress of the concrete, weaken the cracking phenomenon of the concrete and reduce the shrinkage value and creep value.
Comparative example 11
The difference from example 1 is that the experiment was carried out with only one layer of UHPC built up to the same thickness as the build-up of example 1, without further layers.
Comparative example 12
The difference from example 1 is that the thickness of the single UHPC layer in each pavement element is 3mm, and other conditions are the same as example 1, and the pavement element is repeated more times, so that a pavement structure having the same thickness as that of example 1 is finally obtained.
Comparative example 13
The difference from example 1 is that the thickness of the single UHPC layer in each pavement element is 15mm, the other conditions are the same as those of example 1, the pavement elements are repeated more times, and the thickness of the UHPC layer seal layer is adjusted, so that the pavement structure with the same thickness as that of the pavement structure of example 1 is finally obtained.
The bridge deck pavement structures prepared in example 1 and comparative examples 11, 12 and 13 were evaluated, and the mechanical property test required to form a simulated composite structure in a room, the dimensions of which were 1m×1m×10cm, and after curing, the test was performed by cutting and sampling according to the specified dimensions and referring to GB/T31387. The long-term performance and durability test is referred to GB/T50082 test method, and the results are shown in Table 9.
Table 9 results of performance tests of example 1 and comparative example 11, comparative example 12, comparative example 13
As can be seen from the data in the table, when the UHPC layer pavement is paved to the target thickness for one time, the distribution of the mixture fibers is uneven, the numerical values of various mechanical property indexes are lower than those of the UHPC composite structure, and the cracking area value of the unit area of the test piece paved for one time is far greater than that of the layered paving test piece, so that the UHPC composite material and the structure have excellent mechanical property, toughness and crack resistance. The paving thickness of different layers of paving materials is adopted, the lowest layer of paving materials is 3mm, when the paving materials with the same thickness are paved, repeated times are needed, the construction energy consumption is increased, but the mechanical property, the toughness and the crack resistance are lower than those of a paving method; and the too large thickness of the layer pavement can also lead to the reduction of mechanical properties, and the anti-cracking and toughening effects can not be achieved.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (5)
1. The UHPC bridge deck pavement structure is characterized by comprising a plurality of pavement units, wherein each pavement unit comprises a UHPC layer, an interlayer adhesive layer, a long fiber layer, a grid cloth layer and an interlayer adhesive layer which are sequentially arranged, the pavement units circulate for a plurality of times, and finally, the UHPC layer is used for sealing;
the thickness of a single UHPC layer in the paving unit is 5-10 mm;
the interlayer binder layer is selected from water-soluble aluminosilicate sol, and the aluminosilicate has the following structure:
wherein n is selected from 1-50, pH is 10-14, and solid content is 30-50%;
the long fibers of the long fiber layer are special-shaped steel fibers, the fiber length is 20mm-200mm, the fiber diameter is 0.1mm-2mm, and the fiber density of the long fibers is 7000-8000kg/m 3 The spreading amount of the long fibers in each paving unit is 0.7kg/m 2 -16kg/m 2 ；
The mesh cloth layer is a fiber mesh cloth, the fiber is one or more selected from glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber, basalt fiber and carbon fiber, the diameter of fiber monofilaments is 0.1mm-1mm, and the unit gram weight is 80g/m 2 -200g/m 2 The mesh size of the mesh cloth layer is 5mm-10mm;
the UHPC layer comprises 1500-2800 parts by mass of dry mixed material and 50-180 parts by mass of short fiber, wherein the short fiber is flat fiber, and has a fiber length of 2-10 mm, a diameter of 0.1-0.5 mm, and a density of 0.8g/cm 3 -3.0g/cm 3 。
2. The UHPC bridge deck pavement structure of claim 1, wherein the dry blend comprises 600-1200 parts by mass of the premix powder, 800-1400 parts by mass of the aggregate, and 100-200 parts by mass of the thixotropic conditioning agent; the premixed powder comprises 350-700 parts by mass of cementing material, 180-400 parts by mass of admixture, 10-50 parts by mass of size stabilizer and 10-50 parts by mass of powder water reducer.
3. The UHPC bridge deck pavement structure of claim 2, wherein the aggregate comprises an artificial aggregate and a natural aggregate, the aggregate has a particle size ranging from 0.15 mm to 5mm, and the continuous grading conforms to the FULLER maximum density curve equation;
the cementing material is selected from one or more of silicate cement, aluminate cement, sulphoaluminate cement and phosphate cement; the admixture is one or more selected from silica fume, fly ash, slag powder, limestone powder, glass powder and steel slag powder;
the size stabilizer is one or more selected from calcium sulfoaluminate and calcium oxide;
the powder water reducer is one of polycarboxylic acid and polyether.
4. A UHPC deck pavement structure according to claim 3, wherein the thixotropic modifier is selected from one or more of montmorillonite of lamellar structure, organobentonite, modified clay.
5. The method for preparing the UHPC bridge deck pavement structure as claimed in claims 1 to 4, which is characterized by comprising the following steps: stirring the dry mixed material and water into a uniform fluid;
putting the short fibers into the fluid in the step (1), and continuing stirring until UHPC layer spreading is formed;
uniformly paving the UHPC layer pavement in the step (2) on a bridge deck, wherein the thickness is 5mm-10mm;
coating an interlayer adhesive on the surface of the step (3) to form an interlayer adhesive layer, wherein the coating amount is 0.2kg/m 2 -2.0kg/m 2 Uniformly spreading long fibers on the interlayer adhesive;
paving fiber gridding cloth on the surface of the long fiber in the step (4);
coating the interlayer adhesive again on the surface of the fiber mesh cloth in the step (5), wherein the coating amount is 0.2-2.0kg/m 2 ；
And (3) alternately repeating the steps (3), (4), (5) and (6), and then paving a layer of UHPC layer pavement, so as to finally form the UHPC bridge deck pavement structure with the target thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111398562.2A CN114134809B (en) | 2021-11-19 | 2021-11-19 | UHPC bridge deck pavement structure and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111398562.2A CN114134809B (en) | 2021-11-19 | 2021-11-19 | UHPC bridge deck pavement structure and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114134809A CN114134809A (en) | 2022-03-04 |
| CN114134809B true CN114134809B (en) | 2023-09-12 |
Family
ID=80391099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111398562.2A Active CN114134809B (en) | 2021-11-19 | 2021-11-19 | UHPC bridge deck pavement structure and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114134809B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115057677A (en) * | 2022-06-13 | 2022-09-16 | 史俊 | Low-viscosity UHPC decorative sheet |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013007188A (en) * | 2011-06-23 | 2013-01-10 | Ttes Inc | Asphalt pavement structure and asphalt pavement method |
| CN206220378U (en) * | 2016-08-03 | 2017-06-06 | 江西贝融循环材料股份有限公司 | A kind of building roof permanent waterproof layer |
| CN108164216A (en) * | 2017-12-29 | 2018-06-15 | 上海建工集团股份有限公司 | A kind of answering for more than strength grade C100 mixes fiber concrete |
| CN208362836U (en) * | 2018-05-18 | 2019-01-11 | 广东金长成桥梁隧道科技有限公司 | A kind of super pavement of road composite structure |
| CN110304883A (en) * | 2019-08-05 | 2019-10-08 | 福州大学 | A kind of protofibre cement-base composite material and preparation method thereof |
| CN113217014A (en) * | 2021-05-24 | 2021-08-06 | 中铁隧道局集团有限公司 | Permanent repair method for tunnel lining cracks by using UHPC material |
-
2021
- 2021-11-19 CN CN202111398562.2A patent/CN114134809B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013007188A (en) * | 2011-06-23 | 2013-01-10 | Ttes Inc | Asphalt pavement structure and asphalt pavement method |
| CN206220378U (en) * | 2016-08-03 | 2017-06-06 | 江西贝融循环材料股份有限公司 | A kind of building roof permanent waterproof layer |
| CN108164216A (en) * | 2017-12-29 | 2018-06-15 | 上海建工集团股份有限公司 | A kind of answering for more than strength grade C100 mixes fiber concrete |
| CN208362836U (en) * | 2018-05-18 | 2019-01-11 | 广东金长成桥梁隧道科技有限公司 | A kind of super pavement of road composite structure |
| CN110304883A (en) * | 2019-08-05 | 2019-10-08 | 福州大学 | A kind of protofibre cement-base composite material and preparation method thereof |
| CN113217014A (en) * | 2021-05-24 | 2021-08-06 | 中铁隧道局集团有限公司 | Permanent repair method for tunnel lining cracks by using UHPC material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114134809A (en) | 2022-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Xie et al. | Experimental evaluation on fiber distribution characteristics and mechanical properties of calcium carbonate whisker modified hybrid fibers reinforced cementitious composites | |
| Ho et al. | Pore-structures and durability of concrete containing pre-coated fine recycled mixed aggregates using pozzolan and polyvinyl alcohol materials | |
| CN109081655A (en) | A kind of bridge coarse aggregate Reactive Powder Concrete and preparation method thereof | |
| RU2471738C1 (en) | Repair-waterproofing composition and additive in form of wollastonite complex for repair-waterproofing composition, mortar, concrete and articles based thereon | |
| Qian et al. | Fiber alignment and property direction dependency of FRC extrudate | |
| CN110627445B (en) | High-impermeability cement-based repair material for tunnel engineering and preparation method thereof | |
| KR20090036952A (en) | Concrete composition for tunnel lining | |
| CN109836096A (en) | A kind of very-high performance lightweight concrete and preparation method thereof | |
| CN106396558A (en) | Anti-cracking self-leveling material for underfloor heating backfilling and using method thereof | |
| Keskinateş et al. | The influence of mineral additive type and water/binder ratio on matrix phase rheology and multiple cracking potential of HTPP-ECC | |
| CN114134809B (en) | UHPC bridge deck pavement structure and preparation method thereof | |
| CN109356160A (en) | A kind of construction method of mass concrete | |
| CN111960856B (en) | Heat-insulating sound-insulating concrete and preparation method and construction method thereof | |
| JP5543734B2 (en) | Fast curing polymer cement mortar composition for repair and its construction method | |
| CN114163201A (en) | 3D concrete material for printing | |
| CN113200727A (en) | Method for improving rheological property of PVA fiber and nano-silica cement-based composite material | |
| CN104496337B (en) | Nano clay modified fiber cement mortar and preparation method thereof | |
| KR20200100236A (en) | Method for producing lightweight concrete bricks with reduced cement | |
| Cheng et al. | Investigation of the effects of styrene acrylate emulsion and vinyl acetate ethylene copolymer emulsion on the performance and microstructure of mortar | |
| Zhu et al. | Limestone calcined clay cement for three-dimensional-printed engineered cementitious composites | |
| WO2006123632A1 (en) | Lightweight cement based hardened article reinforced with fiber | |
| CN106830798A (en) | A kind of alkali-activated carbonatite glue and its application in concrete strengthening | |
| Awoyera et al. | Potential of natural rubber latex in cement mortar for thermal insulating material in buildings | |
| CN110748036A (en) | High-toughness bionic masonry wall built by 3D printing technology and building method thereof | |
| CN103524098B (en) | A kind of low Ca/Si leads soft state cracking resistance complex phase strengthen material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |