CN114644486A - Bridge pier erosion wear resistant repair segment and preparation method thereof - Google Patents
Bridge pier erosion wear resistant repair segment and preparation method thereof Download PDFInfo
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- CN114644486A CN114644486A CN202210207249.4A CN202210207249A CN114644486A CN 114644486 A CN114644486 A CN 114644486A CN 202210207249 A CN202210207249 A CN 202210207249A CN 114644486 A CN114644486 A CN 114644486A
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- 230000008439 repair process Effects 0.000 title claims abstract description 160
- 230000003628 erosive effect Effects 0.000 title claims abstract description 118
- 238000002360 preparation method Methods 0.000 title abstract description 16
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- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 77
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 77
- 238000005299 abrasion Methods 0.000 claims description 59
- 239000000835 fiber Substances 0.000 claims description 55
- 239000011325 microbead Substances 0.000 claims description 50
- 239000004567 concrete Substances 0.000 claims description 48
- 229910021487 silica fume Inorganic materials 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 38
- 239000003638 chemical reducing agent Substances 0.000 claims description 35
- 239000002131 composite material Substances 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 24
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- 239000000203 mixture Substances 0.000 claims description 15
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- 239000004568 cement Substances 0.000 claims description 10
- 238000013467 fragmentation Methods 0.000 abstract 1
- 238000006062 fragmentation reaction Methods 0.000 abstract 1
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- 239000006004 Quartz sand Substances 0.000 description 38
- 239000002253 acid Substances 0.000 description 29
- 239000011398 Portland cement Substances 0.000 description 27
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- 238000012360 testing method Methods 0.000 description 15
- 238000010276 construction Methods 0.000 description 12
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- 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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/20—Equipment for shipping on coasts, in harbours or on other fixed marine structures, e.g. bollards
- E02B3/26—Fenders
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a bridge pier erosion wear resistant repair segment and a preparation method thereof, wherein the repair segment comprises the following raw materials in parts by weight: 480 parts of water 381-. The repair segment for resisting the erosion and wear of the pier has the advantages of strong tensile strength and compressive strength, excellent toughness, capability of being still connected together after being damaged by impact, no fragmentation, high bonding strength, high erosion resistance and capability of more effectively resisting the erosion and wear of the pier.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a bridge pier erosion wear resistant repair segment and a preparation method thereof.
Background
In rivers in China, the silt content is generally high, 40 rivers with annual silt transportation amount exceeding 1000 ten thousand tons exist, and other rivers also have the phenomenon of silt transportation at different degrees. Erosion and abrasion of a hydraulic concrete structure or a pier caused by silt carried by water flow are inevitable, once the pier is eroded, abraded and damaged, internal defects of concrete are exposed and amplified, the natural environment of the pier is generally severe, and after the internal defects are exposed, other environmental factors such as chloride corrosion, sulfate corrosion, erosion, freeze-thaw cycle and the like can easily damage the pier.
Therefore, the erosion and abrasion of the hydraulic concrete structure or the pier is always a troublesome problem in engineering, and the erosion, abrasion, damage and maintenance of the concrete structure or the pier are difficult and high in cost. In the past, the pier is repaired after being eroded by using an engineering cement-based composite material (polypropylene fiber) with an ultralow water-to-gel ratio, but the toughness can be further improved; the jacket method (underwater pier column fiber sleeve protection system) is adopted to sleeve a permanent protective jacket on the column body, although the cost can be reduced, the jacket method is used for repairing the pier when the pier is submerged in water, and a submersible person needs to launch water to check and clean the damaged pier, so that certain danger is caused; by adopting the small casing box cofferdam method, a proper operation space can be reserved, the reinforced concrete section increasing treatment is carried out in the pier stud disease range, but the dead weight of the structure can be increased, the safety and the integrity of the whole structure are influenced to a certain extent, and the anti-erosion capacity of the pier stud after repair is not improved. Therefore, a concrete material with good erosion resistance is urgently needed as a repairing material, and the repairing technology of rapidness, convenience, reliable performance, controllable cost and the like is adopted to realize the maintenance of the erosion, abrasion and damage of the pier.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a repair segment capable of resisting bridge pier erosion and abrasion and a preparation method thereof, so as to solve the problem that the existing concrete material is poor in erosion resistance.
The technical scheme for solving the technical problems is as follows: the provided bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 480 parts of water 381-.
The invention has the beneficial effects that: the repair segment for resisting the erosion abrasion of the pier has stronger tensile strength and compressive strength, has excellent toughness, is still connected together after being damaged by impact, is not broken into blocks, has larger bonding strength and higher erosion resistance, can more effectively resist the erosion abrasion of the pier, and is suitable for repairing the concrete pier subjected to the erosion abrasion.
The raw materials of the bridge pier erosion wear resistant repair segment are formed by doping PVA fibers, silica fume, micro-beads and additives into partial components of the traditional concrete. The silica fume can improve the strength and the compactness of concrete; the micro-beads can reduce the viscosity of concrete, reduce water consumption and shorten stirring time. The strength of the traditional common concrete can be improved by doping the silica fume and the micro-beads in a certain proportion, and the silica fume and the micro-beads can be better combined with PVA fibers; the PVA fiber has the effects of strengthening, toughening and crack resistance, when microcracks are formed in the repairing duct piece, the PVA fiber can prevent the cracks from developing, when an included angle between the impact direction and the surface of the repairing duct piece resisting the pier erosion abrasion is smaller, the surface of the repairing duct piece resisting the pier erosion abrasion is mainly subjected to the cutting action of sand grains along the surface of the test block, when the surface material of the repairing duct piece resisting the pier erosion abrasion is to be separated, the PVA fiber is prevented from being peeled off from the matrix under the constraint action of the PVA fiber, namely, more energy is consumed for peeling off the material. Therefore, the erosion wear resistance of the repair segment for resisting the erosion wear of the pier can be obviously improved by doping a certain amount of silica fume and micro-beads into the concrete.
On the basis of the technical scheme, the invention can be further improved as follows:
further, the repair segment comprises the following raw materials in parts by weight: 381 parts of water, 826 parts of cement, 191 parts of silica fume, 254 parts of micro-beads, 457 parts of fine aggregate, 19 parts of water reducing agent and 26 parts of PVA fiber.
Further, the PVA fiber has a diameter of 30-35 μm and an aspect ratio of 340-400.
Further, the PVA fiber had a diameter of 32 μm and an aspect ratio of 375.
Further, the particle size of the microbeads is 0.1-5 μm.
Further, the particle diameter of the beads was 0.3. mu.m.
Further, the fine aggregate is quartz sand or river sand; wherein the hardness of the quartz sand is 5-7 degrees.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is 28-32%, and the solid content is 25-30%.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is 30%, and the solid content is 27%.
Further, above-mentioned anti pier erosion and wear's restoration section of jurisdiction includes that the arc is prefabricated restores the section of jurisdiction, and the prefabricated section of jurisdiction one end of restoreing of arc is provided with left edge tongue, and the other end is provided with right edge recess, left edge tongue and right edge recess phase-match.
The beneficial effect of adopting the further technical scheme is as follows: the prefabricated section of jurisdiction cover of restoreing of arc is established on the pier, through left side along tongue and right side along groove phase block, accomplishes transverse connection, can scribble a certain amount of inflation mortar on right side along the groove surface, can make the process of block more moderate, get rid of unnecessary mortar behind the block to form the pier protective sheath, avoid the pier by the erosion wearing and tearing, when left side along the tongue and right side along the fixed vertical seam of groove phase block lies in pier dorsal surface, more can effectually avoid the pier by the erosion wearing and tearing.
Further, the quantity of prefabricated restoration section of jurisdiction of arc is 2 at least.
Further, the prefabricated quantity of restoreing the section of jurisdiction of arc is 3.
The beneficial effect of adopting the further technical scheme is as follows: when the number of the arc-shaped prefabricated repair segments is more than 3, more vertical seams are formed, so that the installation is inconvenient, and the effect of resisting erosion and abrasion of the bridge pier is influenced; when the quantity of section of jurisdiction is restoreed in the arc prefabrication was less than 3, its weight is heavier, and the workman's installation of being inconvenient for, when the quantity of section of jurisdiction is restoreed in the arc prefabrication was 3, its quantity just moderate.
Further, prefabricated restoration section of jurisdiction top of arc is provided with the recess of going up along, and prefabricated restoration section of jurisdiction bottom of arc is provided with down along the tongue, goes up along recess and lower edge tongue phase-match.
The beneficial effect of adopting the further technical scheme is as follows: through the prefabricated lower edge tongue looks block of restoring the section of jurisdiction of going up along recess and another arc with the prefabricated restoration section of jurisdiction of arc, accomplish vertical connection, can scribble a certain amount of expansion mortar on the groove surface of going up along, can make the process of block more moderate, get rid of unnecessary expansion mortar behind the block, so can be according to the high needs of pier water level, increase the height of the restoration section of jurisdiction of anti pier erosion and wear, its vertical seam that increases the prefabricated restoration section of jurisdiction of arc of installation aligns with the vertical seam of bottom.
Further, the thickness of the arc-shaped prefabricated repair pipe piece is 3-5cm, and the height of the arc-shaped prefabricated repair pipe piece is 45-55 cm.
Furthermore, the arc-shaped prefabricated repair segment is provided with a first transverse connection groove and a second transverse connection groove, the first transverse connection groove is formed in the position close to the left edge convex groove, and the second transverse connection groove is correspondingly formed in the position close to the right edge concave groove.
The beneficial effect of adopting the further technical scheme is as follows: the first transverse connecting groove and the second transverse connecting groove which are located at the same height are connected through the matched H-shaped joints, so that transverse connection of the arc-shaped prefabricated repairing pipe piece is firmer, a certain amount of expansion mortar can be poured into the first transverse connecting groove and the second transverse connecting groove, and after the first transverse connecting groove and the second transverse connecting groove are connected through the H-shaped joints, redundant expansion mortar is extruded, so that transverse connection of the arc-shaped prefabricated repairing pipe piece is firmer.
When the arc-shaped prefabricated repair duct piece is installed on a pier, two narrow vertical joints are formed on two sides in the water flow direction, a wider vertical joint is formed in the water flow direction of the pier, the narrow vertical joints do not need to be treated, the influence of the narrow vertical joints on the erosion abrasion of the pier can be ignored, and the wider vertical joints need to be sealed by expansion mortar, so that the erosion abrasion of the pier can be efficiently prevented.
Further, the arc-shaped prefabricated repair segment is provided with a bar planting preformed hole.
The beneficial effect of adopting the further technical scheme is as follows: the steel bars are implanted into the bar planting preformed holes, the repair segment capable of better preventing pier erosion and abrasion is connected with the pier column, and finally, the expansion mortar is poured into the bar planting preformed holes and sealed.
Further, the number of the bar planting preformed holes is at least 4.
The invention also provides a preparation method of the bridge pier erosion wear resistant repair segment, which comprises the following steps:
(1) uniformly mixing cement, silica fume, micro-beads and fine aggregate which are half of the weight of the polyvinyl alcohol concrete composite material, adding PVA fiber which is half of the weight of the polyvinyl alcohol concrete composite material while stirring, adding the rest cement, silica fume, micro-beads and fine aggregate, continuously adding the rest PVA fiber while stirring after uniformly mixing, finally adding a mixture of a water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) and (3) putting the polyvinyl alcohol concrete composite material into a die of the bridge pier erosion abrasion resistant repair segment for molding, demolding after 20-26h, maintaining to obtain an arc prefabricated repair segment, and installing the arc prefabricated repair segment to the bridge pier to obtain the bridge pier erosion abrasion resistant repair segment.
Further, after demoulding, curing for 25-30 days at 20 +/-2 ℃ and relative humidity of more than 95 percent to finish the curing process.
The invention has the following beneficial effects:
1. the repair segment for resisting erosion and abrasion of the pier, which is prepared by the invention, has stronger tensile strength and compressive strength and higher erosion resistance.
2. The pier erosion abrasion resistant repair segment is simple in structure, convenient to install and high in practicability, can effectively resist pier erosion abrasion, and solves the bridge safety risk problems caused by the fact that honeycomb pitted surfaces appear on the surface of an existing pier when the existing pier is eroded, aggregate is exposed, and even a protective layer falls off, reinforcing steel bars are exposed, and the cross-sectional area is reduced.
Drawings
FIG. 1 is a schematic view of a repair segment for resisting erosion and wear of a bridge pier according to the present invention;
FIG. 2 is a schematic front view of an arcuate prefabricated duct piece according to the present invention;
FIG. 3 is a schematic reverse side view of an arcuate prefabricated duct piece according to the present invention;
FIG. 4 is a partial enlarged view of the left edge tongue of the arc-shaped prefabricated segment according to the present invention;
FIG. 5 is a partial enlarged view of the groove at the right edge of the arc-shaped prefabricated repair segment according to the present invention;
FIG. 6 is a top view of a repair segment of the present invention resistant to erosive wear by pier;
FIG. 7 is an I-joint for an arcuate prefabricated repair segment in accordance with the present invention;
FIG. 8 is a graph of the compressive strength of each of the arc-shaped prefabricated duct pieces;
FIG. 9 is a graph of mass loss for each arcuate pre-fabricated repair segment at an impingement angle of 90;
FIG. 10 is a graph of mass loss for each arcuate pre-fabricated repair segment at an impingement angle of 30;
FIG. 11 is a graph of mass loss versus erosion time for the arcuate pre-fabricated repair segments made in example 3 and comparative example 1;
FIG. 12 is a graph of mass loss versus erosion rate for curved pre-fabricated repair segments made in example 3 and comparative example 1;
fig. 13 is a graph of mass loss versus erosion sand fraction for the arcuate pre-cast repair segments made in example 3 and comparative example 1.
Wherein, 1, arc prefabrication is carried out to repair the pipe piece; 2. a left edge tongue; 3. a right edge groove; 4. a bridge pier; 5. an upper edge groove; 6. a lower edge convex groove; 7. a first lateral connecting groove; 8. a second lateral connecting groove; 9. a narrower vertical seam; 10. a wider vertical seam; 11. planting a steel bar preformed hole; 12. an I-shaped joint.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of example only and not intended to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example (b):
referring to fig. 1-7, a repair segment for resisting erosion and wear of a pier comprises an arc-shaped prefabricated repair segment 1, wherein one end of the arc-shaped prefabricated repair segment 1 is provided with a left edge convex groove 2, the other end of the arc-shaped prefabricated repair segment is provided with a right edge groove 3, and the left edge convex groove 2 is matched with the right edge groove 3; the arc-shaped prefabricated repair segment 1 is sleeved on the pier 4. Prefabricated section of jurisdiction 1 cover of restoreing of arc is established on pier 4, through left side along tongue 2 and the 3 looks blocks of right side edge recess, accomplish transverse connection, can scribble a certain amount of expansion mortar on the 3 surfaces of right side edge recess, can make the process of block more moderate, get rid of unnecessary mortar behind the block, thereby form pier 4 protective sheath, avoid pier 4 by the erosion and abrasion, when the fixed vertical seam of left side edge tongue 2 and the 3 looks blocks of right side edge recess is located pier 4 background of the body, more can effectually avoid pier 4 by the erosion and abrasion.
The number of the arc-shaped prefabricated repair pipe pieces 1 is 3. When the number of the arc-shaped prefabricated repair pipe pieces 1 is more than 3, more vertical joints are formed, so that the installation is inconvenient, and the effect of resisting erosion and abrasion of the bridge piers is influenced; when the quantity of prefabricated restoration section of jurisdiction 1 of arc was less than 3, its weight is heavier, and the workman's installation of being inconvenient for when the quantity of prefabricated restoration section of jurisdiction 1 of arc was 3, its quantity just is moderate, and the left edge tongue 2 that restores section of jurisdiction 1 with the prefabrication of one of them arc during the installation and the prefabricated right edge recess 3 looks block of restoring section of jurisdiction 1 of another arc, then above-mentioned operation in proper order.
In order to increase the height of the repair segment of anti pier erosion and abrasion, the top of the arc-shaped prefabricated repair segment 1 is provided with an upper edge groove 5, the bottom of the arc-shaped prefabricated repair segment 1 is provided with a lower edge convex groove 6, and the upper edge groove 5 is matched with the lower edge convex groove 6. Through the prefabricated lower edge tongue 6 looks block of restoring section of jurisdiction 1 along recess 5 and another arc with the prefabricated restoration section of jurisdiction of going up of an arc, accomplish vertical connection, can scribble a certain amount of expansion mortar on the last recess 5 surface of following, can make the process of block more moderate, get rid of unnecessary expansion mortar behind the block, so can be according to the high needs of 4 water levels of pier, increase the height of the restoration section of jurisdiction of anti pier erosion and wear, its vertical seam that increases the prefabricated restoration section of jurisdiction 1 of arc of installation aligns with the vertical seam of bottom.
The thickness of the arc-shaped prefabricated repair pipe piece 1 is 3-5cm, and the height of the arc-shaped prefabricated repair pipe piece is 45-55 cm. Therefore, the anti-erosion bridge pier can effectively resist erosion and abrasion of the bridge pier, and is convenient to install.
For making the prefabricated transverse connection of restoreing section of jurisdiction 1 of arc more firm, be provided with first transverse connection groove 7 and second transverse connection groove 8 on the prefabricated restoration section of jurisdiction 1 of arc, first transverse connection groove 7 sets up in being close to left edge tongue 2 department, and second transverse connection groove 8 corresponds sets up in being close to right edge recess 3 department. The first transverse connecting groove 7 and the second transverse connecting groove 8 which are located at the same height are connected through the matched H-shaped joints 12, so that transverse connection of the arc-shaped prefabricated repairing pipe piece 1 is firmer, a certain amount of expansion mortar can be poured into the first transverse connecting groove 7 and the second transverse connecting groove 8, and after the first transverse connecting groove 7 and the second transverse connecting groove are connected through the H-shaped joints 12, redundant expansion mortar is extruded, so that transverse connection of the arc-shaped prefabricated repairing pipe piece 1 is firmer. When the arc-shaped prefabricated repair segment 1 is installed on a pier 4, two narrow vertical joints 9 are formed on two sides in the water flow direction, a wide vertical joint 10 is formed in the back water flow direction of the pier 4, the narrow vertical joints 9 do not need to be treated, the influence of the narrow vertical joints on the erosion and abrasion of the pier can be ignored, and the wide vertical joints 10 need to be sealed by expansion mortar to ensure the efficient erosion and abrasion resistance of the pier.
For the restoration section of jurisdiction that makes pier erosion and wear be connected with the pier stud, be provided with bar planting preformed hole 11 on the prefabricated restoration section of jurisdiction 1 of arc, the number of bar planting preformed hole 11 is 4 at least. The steel bars are implanted into the bar planting preformed holes, so that the repair segment capable of resisting erosion and abrasion of the pier can be better connected with the pier column, and finally, the expansion mortar is poured into the bar planting preformed holes and sealed.
When the repairing segment for resisting erosion and abrasion of the pier is used for repairing, the repairing method is specifically carried out according to the following method:
pretreatment of erosion pier
Chiseling a surface layer of a concrete pier erosion part which fails, cleaning the surface of the concrete pier, and troweling the surface of the concrete pier by adopting M15-grade expansion mortar, wherein the mixing ratio of cement, river sand and water is 1: 5.27: 1.16, the mixing amount of the expanding agent is 10 percent, and the plastic film is used for sealing and curing under the normal construction condition; if the reinforcing steel bars in the pier are exposed due to erosion, impurities among the reinforcing steel bars need to be removed, the surface of the reinforcing steel bars is subjected to rust removal treatment and then is poured into expanded concrete, the grade of the concrete is the same as that of the original pier, the mixing amount of an expanding agent is 10%, and the concrete is sealed and maintained by a plastic film under normal construction conditions;
secondly, preparing arc prefabricated repair pipe pieces according to the method;
thirdly, installing the arc-shaped prefabricated repair pipe piece prepared by the invention on the concrete pier below the water level, then implanting the connecting steel bars into the reserved holes, wherein the connecting steel bars cannot leak out of the pipe piece, and then pouring expanded concrete to seal the reserved holes, the transverse connecting grooves among the pipe pieces with the same height and different heights and the vertical wide joint with the width of 4 cm.
The concrete parameters of the raw materials used for preparing the repair segment for resisting the erosion and wear of the pier are as follows: the chemical composition of the silica fume is shown in the table 1; the main chemical indexes of the microbeads are shown in table 2; the physical property indexes of the quartz sand are shown in Table 3; the physical performance parameters of the river sand are as follows: medium sand with fineness modulus of 2.81 and bulk density of 1460kg/m3Apparent density 2500kg/m3(ii) a The physical property indexes of the PVA fibers are shown in Table 4.
TABLE 1 silica fume chemical composition
| Composition (I) | SiO2 | CaO | MgO | Fe2O3 | Al2O3 | Loss |
| Content (mt%) | 91.27 | 0.45 | 0.92 | 0.45 | 0.17 | 2.88 |
TABLE 2 Main chemical indices of the microbeads
| Composition (I) | SiO2 | CaO | MgO | Al2O3 | Fe2O3 | Na2O | K2O | SO3 | Loss |
| Content (mt%) | 56.5 | 4.8 | 1.3 | 26.5 | 5.3 | 1.4 | 3.3 | 0.7 | <1 |
TABLE 3 index of physical Properties of Quartz Sand
TABLE 4 physical Properties of PVA fibers
Example 1
A bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 381 parts of water, 1080 parts of ordinary portland cement, 64 parts of silica fume, 127 parts of micro-beads, 457 parts of quartz sand, 19 parts of polycarboxylic acid water reducing agent and 26 parts of PVA fibers; wherein, the particle size of the micro-bead is 0.17 μm; the hardness of the quartz sand is 57 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 287 percent, and the solid content is 257 percent; the PVA fibers had a diameter of 30 μm and an aspect ratio of 340.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) and (2) putting the polyvinyl alcohol concrete composite material into a die of a repair segment for resisting bridge pier erosion and abrasion for molding, demolding after 24 hours, sealing and maintaining for 28 days by using a plastic film under normal construction conditions to prepare an arc prefabricated repair segment, and installing the arc prefabricated repair segment to a bridge pier to prepare the repair segment for resisting bridge pier erosion and abrasion.
Example 2:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 381 parts of water, 953 parts of ordinary portland cement, 127 parts of silica fume, 191 parts of microbeads, 457 parts of river sand, 19 parts of a polycarboxylic acid water reducing agent and 26 parts of PVA fibers; wherein, the particle size of the micro-bead is 5 μm; the hardness of the quartz sand is 7 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 32 percent, and the solid content is 30 percent; the PVA fibers had a diameter of 35 μm and an aspect ratio of 400.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) and (2) putting the polyvinyl alcohol concrete composite material into a die of a repair segment for resisting bridge pier erosion and abrasion for molding, demolding after 24 hours, sealing and maintaining for 28 days by using a plastic film under normal construction conditions to prepare an arc prefabricated repair segment, and installing the arc prefabricated repair segment to a bridge pier to prepare the repair segment for resisting bridge pier erosion and abrasion.
Example 3:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 381 parts of water, 826 parts of ordinary portland cement, 191 parts of silica fume, 254 parts of micro-beads, 457 parts of quartz sand, 19 parts of polycarboxylic acid water reducing agent and 26 parts of PVA fiber; wherein, the particle size of the micro-bead is 0.3 μm; the hardness of the quartz sand is 6 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 30 percent, and the solid content is 27 percent; the PVA fibers had a diameter of 32 μm and an aspect ratio of 375.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of the ordinary portland cement, the silica fume, the micro-beads and the quartz sand, adding half of the PVA fiber while stirring, adding the rest of the ordinary portland cement, the silica fume, the micro-beads and the quartz sand, continuously adding the rest of the PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) the polyvinyl alcohol concrete composite material is placed into a die of a repair segment for resisting erosion and abrasion of a pier for molding, demoulding is carried out after 24 hours, the plastic film is used for sealing and maintaining for 28 days under normal construction conditions to prepare an arc-shaped prefabricated repair segment, and the arc-shaped prefabricated repair segment is installed on the pier to prepare the repair segment for resisting erosion and abrasion of the pier, wherein the thickness of the repair segment is 4cm, and the height of the repair segment is 50 cm.
Example 4:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 432 parts of water, 987 parts of ordinary portland cement, 62 parts of silica fume, 185 parts of micro-beads, 444 parts of quartz sand, 19 parts of polycarboxylic acid water reducing agent and 26 parts of PVA fibers; wherein, the particle size of the micro-bead is 0.3 μm; the hardness of the quartz sand is 6 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 29 percent, and the solid content is 26 percent; the PVA fibers had a diameter of 33 μm and an aspect ratio of 350.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) the polyvinyl alcohol concrete composite material is placed into a die of a repair segment for resisting erosion and abrasion of a pier for molding, demoulding is carried out after 24 hours, the plastic film is used for sealing and maintaining for 28 days under normal construction conditions to prepare an arc-shaped prefabricated repair segment, and the arc-shaped prefabricated repair segment is installed on the pier to prepare the repair segment for resisting erosion and abrasion of the pier, wherein the thickness of the repair segment is 4cm, and the height of the repair segment is 50 cm.
Example 5:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 432 parts of water, 864 parts of ordinary portland cement, 123 parts of silica fume, 247 parts of microspheres, 444 parts of quartz sand, 19 parts of a polycarboxylic acid water reducing agent and 26 parts of PVA fibers; wherein, the particle size of the micro-bead is 0.4 μm; the hardness of the quartz sand is 6 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 31 percent, and the solid content is 28 percent; the PVA fibers had a diameter of 34 μm and an aspect ratio of 360.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) the polyvinyl alcohol concrete composite material is placed into a die of a repair segment for resisting erosion and abrasion of a pier for molding, demoulding is carried out after 24 hours, the plastic film is used for sealing and maintaining for 28 days under normal construction conditions to prepare an arc-shaped prefabricated repair segment, and the arc-shaped prefabricated repair segment is installed on the pier to prepare the repair segment for resisting erosion and abrasion of the pier, wherein the thickness of the repair segment is 4cm, and the height of the repair segment is 50 cm.
Example 6:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 432 parts of water, 925 parts of ordinary portland cement, 185 parts of silica fume, 123 parts of microbeads, 444 parts of quartz sand, 19 parts of a polycarboxylic acid water reducing agent and 26 parts of PVA fibers; wherein, the particle size of the micro-bead is 2 μm; the hardness of the quartz sand is 5-7 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 32 percent, and the solid content is 30 percent; the PVA fibers had a diameter of 35 μm and an aspect ratio of 400.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) the polyvinyl alcohol concrete composite material is placed into a die of a repair segment for resisting erosion and abrasion of a pier for molding, demoulding is carried out after 24 hours, the plastic film is used for sealing and maintaining for 28 days under normal construction conditions to prepare an arc-shaped prefabricated repair segment, and the arc-shaped prefabricated repair segment is installed on the pier to prepare the repair segment for resisting erosion and abrasion of the pier, wherein the thickness of the repair segment is 4cm, and the height of the repair segment is 50 cm.
Example 7:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 480 parts of water, 899 parts of ordinary portland cement, 60 parts of silica fume, 240 parts of micro-beads, 432 parts of quartz sand, 18 parts of polycarboxylic acid water reducing agent and 26 parts of PVA fiber; wherein, the particle size of the micro-bead is 4 μm; the hardness of the quartz sand is 6 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 32 percent, and the solid content is 27 percent; the PVA fibers had a diameter of 35 μm and an aspect ratio of 380.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) and (2) putting the polyvinyl alcohol concrete composite material into a die of a repair segment for resisting bridge pier erosion and abrasion for molding, demolding after 24 hours, sealing and maintaining for 28 days by using a plastic film under normal construction conditions to prepare an arc prefabricated repair segment, and installing the arc prefabricated repair segment to a bridge pier to prepare the repair segment for resisting bridge pier erosion and abrasion.
Example 8:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 381 parts of water, 826 parts of ordinary portland cement, 191 parts of silica fume, 254 parts of micro-beads, 457 parts of quartz sand, 19 parts of polycarboxylic acid water reducing agent and 26 parts of PVA fiber; wherein, the particle size of the micro-bead is 0.1-5 μm; the hardness of the quartz sand is 5-7 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 28-32%, and the solid content is 25-30%; the diameter of the PVA fiber is 30-35 μm, and the length-diameter ratio is 340-400.
A preparation method of a repair segment for resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) the polyvinyl alcohol concrete composite material is placed into a die of a repair segment for resisting erosion and abrasion of a pier for molding, demoulding is carried out after 24 hours, the plastic film is used for sealing and maintaining for 28 days under normal construction conditions to prepare an arc-shaped prefabricated repair segment, and the arc-shaped prefabricated repair segment is installed on the pier to prepare the repair segment for resisting erosion and abrasion of the pier, wherein the thickness of the repair segment is 4cm, and the height of the repair segment is 50 cm.
Example 9:
a bridge pier erosion wear resistant repair segment comprises the following raw materials in parts by weight: 480 parts of water, 839 parts of ordinary portland cement, 180 parts of silica fume, 180 parts of microbeads, 432 parts of quartz sand, 18 parts of polycarboxylic acid water reducing agent and 26 parts of PVA fibers; wherein, the particle size of the micro-bead is 3 μm; the hardness of the quartz sand is 6 degrees; the water reducing rate of the polycarboxylic acid water reducing agent is 30 percent, and the solid content is 28 percent; the PVA fibers had a diameter of 31 μm and an aspect ratio of 350.
A preparation method of a repair segment capable of resisting erosion and abrasion of a pier comprises the following steps:
(1) uniformly mixing half of ordinary portland cement, silica fume, microbeads and quartz sand, adding half of PVA fiber by weight while stirring, adding the rest of ordinary portland cement, silica fume, microbeads and quartz sand, continuously adding the rest of PVA fiber while stirring after uniformly mixing, finally adding a mixture of a polycarboxylic acid water reducing agent and water, and uniformly mixing to obtain the polyvinyl alcohol concrete composite material;
(2) the polyvinyl alcohol concrete composite material is placed into a die of a repair segment for resisting erosion and abrasion of a pier for molding, demoulding is carried out after 24 hours, the plastic film is used for sealing and maintaining for 28 days under normal construction conditions to prepare an arc-shaped prefabricated repair segment, and the arc-shaped prefabricated repair segment is installed on the pier to prepare the repair segment for resisting erosion and abrasion of the pier, wherein the thickness of the repair segment is 4cm, and the height of the repair segment is 50 cm.
Comparative example 1:
a pier repairing duct piece comprises the following raw materials in parts by weight: 160 parts of water, 533.33 parts of cement and 1406.67 parts of mortar.
A preparation method of a bridge pier repair segment comprises the following steps:
(1) uniformly mixing cement and sand, then adding water while stirring, and uniformly mixing to obtain a mixed material;
(2) and (3) putting the mixed material into a die of a bridge pier repairing segment for molding, demolding after 24 hours, sealing and maintaining for 28 days by using a plastic film under normal construction conditions to prepare an arc-shaped prefabricated repairing segment, and installing the arc-shaped prefabricated repairing segment to a bridge pier to prepare the bridge pier repairing segment, wherein the thickness of the bridge pier repairing segment is 4cm, and the height of the bridge pier repairing segment is 50 cm.
Test example:
the compressive strength and the quality loss of the arc-shaped prefabricated repair pipe piece prepared in the examples 1-9 and the comparative example 1 are detected, and the specific detection method of the compressive strength comprises the following steps: according to the regulation of item 6 in the Standard of test methods for mechanical Properties of general concrete (GB/T50081-2019), the pressurization speed is 0.5 MPA/s. The specific detection method of the mass loss comprises the following steps: (1) carrying out water saturation treatment on the test block, soaking the test block in water for 24 hours before testing, and weighing the test block twice until the mass is increased by not more than 0.1g, which indicates that the test block is saturated by water; and taking the average value of the three mass results; (2) putting the weighed test block into a test block fixing device for erosion simulation test (the specific erosion condition is that the sand content is 100Kg/m3The impact speed is 6.32m/s, the grain size of sand grains is 1mm, the erosion time is 60min), after the test is finished, taking out the test block, wiping the test block, weighing the test block for 3 times, and obtaining the mass accurate to 0.01g, taking the average value of the mass, and calculating the mass difference before and after the test, namely the mass loss.
The detection result of the compressive strength is shown in figure 8, and as can be seen from figure 8, the compressive strength of the arc-shaped prefabricated repair segment prepared by the method is higher than that of the arc-shaped prefabricated repair segment prepared by common mortar.
When the impact angle is 90 degrees, the mass loss is shown in figure 9, when the impact angle is 30 degrees, the mass loss is shown in figure 10, and as can be seen from figures 9-10, the mass loss of the arc-shaped prefabricated repair segment prepared by the method is smaller than that of the arc-shaped prefabricated repair segment prepared by common mortar.
The compressive strength of the prepared arc-shaped prefabricated repair segment is 1.6 times that of the arc-shaped prefabricated repair segment prepared from the common mortar, and the mass loss of the prepared arc-shaped prefabricated repair segment is about 0.6 time that of the arc-shaped prefabricated repair segment prepared from the common mortar.
Secondly, drawing the mass loss and the erosion time of the arc-shaped prefabricated repair pipe piece prepared in the embodiment 3 and the comparative example 1, and obtaining a result as shown in fig. 11, wherein as can be seen from the drawing 11, the mass damage fluctuation of the arc-shaped prefabricated repair pipe piece prepared from the common mortar is relatively large in each 10min period; the arc-shaped prefabricated repair segment prepared by the method is uniform in material, the quality damage fluctuation in unit time is relatively small, and the quality damage amount in unit time is reduced along with the increase of time.
Thirdly, detecting the mass loss of the arc-shaped prefabricated repair pipe piece prepared in the embodiment 3 and the comparative example 1 at different impact speeds according to the mass loss detection method, wherein the specific erosion conditions are as follows: the sand content is 50Kg/m3The grain size of the sand grains is 1mm, and the erosion time is 30 min. The results are shown in fig. 12, and it can be seen from fig. 12 that the mass loss of the arc-shaped prefabricated repair segment prepared by the invention and the mass loss of the arc-shaped prefabricated repair segment prepared by the common mortar concrete are increased along with the increase of the impact speed, but the mass loss rate of the prepared arc-shaped prefabricated repair segment is slower and the mass loss is smaller.
Fourthly, the arc-shaped prefabricated repair pipe pieces prepared in the embodiment 3 and the comparative example 1 are subjected to mass loss detection under different sand content impacts according to the mass loss detection method, and the specific erosion conditions are as follows: the impact velocity is 6.32m/s, the grain size of the sand grains is 1mm, and the erosion time is 30 min. The result is shown in fig. 13, and as can be seen from fig. 13, along with the increase of the sand content, the mass loss rate of the arc-shaped prefabricated repair segment prepared by the method is high before low, and the increase is gentle; the mass loss rate of the arc-shaped prefabricated repair segment made of the common mortar concrete is increased continuously, and the mass loss is large.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. The repair segment capable of resisting erosion and abrasion of the pier is characterized by comprising the following raw materials in parts by weight: 480 parts of water 381-.
2. The bridge pier erosive wear-resistant repair segment as set forth in claim 1, comprising the following raw materials in parts by weight: 381 parts of water, 826 parts of cement, 191 parts of silica fume, 254 parts of micro-beads, 457 parts of fine aggregate, 19 parts of water reducing agent and 26 parts of PVA fiber.
3. The bridge pier erosive wear resistant prosthetic tube sheet according to claim 1 or 2, wherein the PVA fiber has a diameter of 30-35 μm and an aspect ratio of 340-400.
4. The bridge pier erosive wear resistant prosthetic segment according to claim 1 or 2, wherein the particle size of the microbeads is 0.1-5 μm.
5. The method for preparing a bridge pier erosive wear resistant repair segment according to any one of claims 1-4, characterized by comprising the steps of:
(1) uniformly mixing half of the cement, the silica fume, the microbeads and the fine aggregate, adding half of the PVA fiber while stirring, adding the rest of the cement, the silica fume, the microbeads and the fine aggregate, continuously adding the rest of the PVA fiber while stirring after uniformly mixing, and finally adding a mixture of a water reducing agent and water, and uniformly mixing to prepare the polyvinyl alcohol concrete composite material;
(2) and (3) putting the polyvinyl alcohol concrete composite material into a die of the bridge pier erosion abrasion resistant repair segment for molding, demolding after 20-26h, maintaining to obtain an arc prefabricated repair segment, and installing the arc prefabricated repair segment to the bridge pier to obtain the bridge pier erosion abrasion resistant repair segment.
6. The bridge pier erosion wear resistant repair segment according to any one of claims 1-4, which comprises an arc-shaped prefabricated repair segment (1), wherein one end of the arc-shaped prefabricated repair segment (1) is provided with a left edge convex groove (2), the other end of the arc-shaped prefabricated repair segment is provided with a right edge groove (3), and the left edge convex groove (2) is matched with the right edge groove (3).
7. The bridge pier erosive wear resistant repair segment according to claim 6, characterized in that the number of the arc-shaped prefabricated repair segments (1) is at least 2.
8. The bridge pier erosive wear resistant repair segment according to claim 6, characterized in that an upper edge groove (5) is arranged at the top of the arc-shaped prefabricated repair segment (1), a lower edge convex groove (6) is arranged at the bottom of the arc-shaped prefabricated repair segment (1), and the upper edge groove (5) is matched with the lower edge convex groove (6).
9. The bridge pier erosion wear resistant repair segment according to claim 6, wherein a first transverse connection groove (7) and a second transverse connection groove (8) are arranged on the arc-shaped prefabricated repair segment (1), the first transverse connection groove (7) is arranged close to the left edge convex groove (2), and the second transverse connection groove (8) is correspondingly arranged close to the right edge concave groove (3).
10. The bridge pier erosive wear resistant repair segment according to claim 6, characterized in that the arc-shaped prefabricated repair segment (1) is provided with a bar planting prepared hole (11).
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| US6610138B1 (en) * | 2001-11-13 | 2003-08-26 | Paul W. Brown | Method of resisting corrosion in metal reinforcing elements contained in concrete and related compounds and structures |
| CN103938553A (en) * | 2014-04-08 | 2014-07-23 | 东南大学 | Construction method for fast assembling precast concrete panels to reinforce underwater structure |
| CN205205739U (en) * | 2015-11-24 | 2016-05-04 | 常州工程职业技术学院 | EPS concrete shocks resistance and protects prefabricated section of jurisdiction of feather joint for circular pier |
| CN111233390A (en) * | 2020-01-15 | 2020-06-05 | 中建材中岩科技有限公司 | Ultrahigh-performance anti-abrasion concrete |
| CN111549655A (en) * | 2020-04-29 | 2020-08-18 | 上海复培新材料科技有限公司 | Composite material for reinforcing and repairing ultrahigh-performance pier and preparation method thereof |
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- 2022-03-03 CN CN202210207249.4A patent/CN114644486A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6610138B1 (en) * | 2001-11-13 | 2003-08-26 | Paul W. Brown | Method of resisting corrosion in metal reinforcing elements contained in concrete and related compounds and structures |
| CN103938553A (en) * | 2014-04-08 | 2014-07-23 | 东南大学 | Construction method for fast assembling precast concrete panels to reinforce underwater structure |
| CN205205739U (en) * | 2015-11-24 | 2016-05-04 | 常州工程职业技术学院 | EPS concrete shocks resistance and protects prefabricated section of jurisdiction of feather joint for circular pier |
| CN111233390A (en) * | 2020-01-15 | 2020-06-05 | 中建材中岩科技有限公司 | Ultrahigh-performance anti-abrasion concrete |
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