CN114855542A - UHPC hollow curb and construction method thereof - Google Patents
UHPC hollow curb and construction method thereof Download PDFInfo
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- CN114855542A CN114855542A CN202210522869.7A CN202210522869A CN114855542A CN 114855542 A CN114855542 A CN 114855542A CN 202210522869 A CN202210522869 A CN 202210522869A CN 114855542 A CN114855542 A CN 114855542A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 146
- 238000010276 construction Methods 0.000 title claims abstract description 51
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 66
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000004576 sand Substances 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 7
- 239000011707 mineral Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 description 20
- 239000006004 Quartz sand Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 6
- 238000009417 prefabrication Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
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- 201000010099 disease Diseases 0.000 description 4
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
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- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/52—Apparatus for laying individual preformed surfacing elements, e.g. kerbstones
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a UHPC hollow curb and a construction method thereof, belonging to the technical field of curb construction and comprising a prefabricated UHPC hollow structure and a prefabricated mortar base, wherein the UHPC hollow structure and the mortar base are fixedly connected through an adhesion material; the UHPC hollow structure is made of an ultrahigh-performance concrete material and comprises cement, mineral powder, silica fume, polyvinyl alcohol fibers, water, a high-efficiency water reducing agent and tailing sand, the whole structure is of an inverted U-shaped structure, the mortar base is of a double-groove structure, and the UHPC hollow structure is clamped in the double-groove structure. The invention prefabricates UHPC material with excellent mechanical property and high durability into the kerbstone, and adopts the hollow section to reduce the using amount of the UHPC.
Description
Technical Field
The invention relates to a UHPC hollow curb and a construction method thereof, belonging to the technical field of curb construction.
Background
According to the difference of the production materials, the kerbstones can be divided into two types: one is rock type kerbstone and the other is ordinary concrete type kerbstone. The rock type kerbstone has good mechanical property and corrosion resistance, but has high cost and is difficult to be applied on roads in a large scale. The common concrete kerbstone has lower cost than rock kerbstone, but has poorer capability of resisting the continuous freeze-thaw damage under natural weather conditions and the corrosion damage caused by a snow remover, and is easy to have diseases such as surface looseness, peeling, edge deletion, corner drop and the like in the normal use process, the diseases are more serious in northern areas of China, and particularly when ice salt is scattered on the pavement in cold areas, the salt freezing action can accelerate the surface of the concrete to fall off, so a series of diseases are caused.
Research shows that the stripping amount of the common concrete in the salt solution during single-sided freeze thawing is 14 times of that of the common concrete in the common water after full-immersion freeze thawing. When the common concrete curb has the above diseases, if maintenance is not carried out, the service life of the curb is shortened, and traffic accidents and loss of people and property are caused. However, the maintenance of the kerbstone often causes serious traffic inconvenience, and the maintenance cost and economic loss caused by the traffic inconvenience are unpredictable. Moreover, most of the existing kerbs are of solid structures, have large dead weights and are difficult to transport and construct. Aiming at the problems of poor durability, short service life, high maintenance cost and the like of the common concrete kerbstone, a material with excellent performance and durability is urgently needed to replace the common concrete to prepare the durable kerbstone so as to prolong the service life of the kerbstone and reduce the total life cycle cost of the kerbstone.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the UHPC hollow kerbstone and the construction method thereof, the UHPC material with excellent mechanical property and high durability is prefabricated into the kerbstone, and the hollow section is adopted to reduce the using amount of the UHPC.
The invention adopts the following technical scheme:
a UHPC hollow curb comprises a prefabricated UHPC hollow structure and a prefabricated mortar base, wherein the UHPC hollow structure and the mortar base are fixedly connected through an adhesion material;
the UHPC hollow structure is made of an ultrahigh-performance concrete material and comprises cement, mineral powder, silica fume, polyvinyl alcohol fibers, water, a high-efficiency water reducing agent and tailing sand, the material has the characteristics of high compactness, good mechanical property and high durability, the UHPC hollow structure is integrally of an inverted U-shaped structure, a mortar base is of a double-groove structure, the total height is 75mm, the full width is 300mm, the prefabricated length is 500mm, the double grooves are symmetrically distributed, and the UHPC hollow structure is clamped in the double-groove structure. The adhesion material is cast in the gap between the UHPC hollow structure and the mortar base in site during construction, and the UHPC hollow structure and the mortar base are prefabricated by a factory before construction.
The ultra-high performance concrete (UHPC) is a novel gelled composite material based on a particle tight packing theory and a hybrid fiber reinforced and toughened mechanism, adopts steel fibers as main reinforced fibers, and has excellent mechanical properties and durability compared with the traditional concrete. The compressive strength can reach 200 MPa. Meanwhile, UHPC also exhibits excellent durability due to its low water-to-gel ratio, microcrack effect, and self-healing capability. Based on the excellent mechanical property and durability of the UHPC, the UHPC is selected to replace common concrete to be used for manufacturing the curb, so that the service performance of the curb can be prolonged, and the life cycle cost of the curb is greatly reduced. On the basis, the hollow kerbstone structure is designed, reasonable thickness of the kerbstone is adopted, so that the bearing capacity of the kerbstone can meet the standard requirement, the material consumption can be reduced, the self weight of the kerbstone is reduced, and the transportation difficulty and the construction cost are reduced.
Preferably, the mortar base is prefabricated by adopting M20 grade tailing mortar;
the adhesion material is cement paste with a water cement ratio of 0.5, and the adhesion material comprises the following components in parts by mass: water 1: 0.5.
preferably, the depth and the width of the double grooves on the mortar base are both 25mm, and the distance between the edge of the groove and the outer edge of the mortar base is 50 mm.
Preferably, in the UHPC hollow structure, the mass ratio of cement, mineral powder, silica fume, fiber, water, high-efficiency water reducing agent and tailing sand is 1: 0.56: 0.19: 0.02: 0.29: 0.06: 1, wherein the fiber is PVA fiber produced by Colorado, Japan, and the tailing sand is 80-130 meshes.
Because the wall thickness of the hollow curb is smaller, the requirement on the working performance of the mixture is higher when the hollow curb is cast and prefabricated in a mold, the water-cement ratio in the mixing ratio is 0.16, the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, the water reducing rate is about 30%, the fluidity of the mixture is better, and the working performance meets the construction requirement.
In order to meet the bearing requirements of the hollow structure of the kerbstone, the compressive strength of the UHPC is 80-120MPa, the flexural strength is 20-25MPa, and when the wall thickness of the hollow kerbstone is 15-25mm and the length is 750mm, the bearing capacity of the UHPC hollow kerbstone reaches 2.5-4 times of the bearing capacity of the common concrete (the compressive strength is 30MPa and the flexural strength is 3.5MPa) solid kerbstone, so that the bearing capacity of the kerbstone is improved, the preparation raw materials can be saved, the dead weight of the kerbstone is reduced, and the transportation difficulty and the construction cost are reduced.
The UHPC is used for preparing the kerbstone based on the UHPC compact packing effect and the microcrack effect, so that the mechanical property and the durability of the kerbstone are enhanced, the service life of the kerbstone is greatly prolonged, and the life cycle cost is reduced;
the UHPC is prepared by adopting PVA fiber, and in order to meet the construction requirement of the UHPC hollow kerbstone, the UHPC with the fluidity of 150mm or more is adopted;
preferably, the tailing mortar of the mortar base is prepared from cement in a mass mixing ratio: tailing sand: water 1: 4.03: 0.89.
the UHPC hollow structure and the mortar base both use the tailing sand which is industrial solid waste, so that the problem of low utilization rate of the tailing sand is solved, the tailing sand can completely replace quartz sand in the traditional UHPC mixture ratio, and the quartz sand plays a role of filling a framework in an UHPC system, the grain diameter and hardness of the tailing sand are similar to those of the quartz sand, the quartz sand can be replaced in equal amount, and the preparation cost of the UHPC is reduced by about 15%;
preferably, the total height of the UHPC hollow structure is 250mm, the total width is 200mm, the thickness is 15-25mm, preferably 25mm, a chamfer is arranged at the turning part inside the UHPC hollow structure, and the radius of the chamfer is 10 mm.
Preferably, the upper half part of the side close to the road side in the UHPC hollow structure is provided with a certain inclination angle which is 4-6 degrees, preferably 5 degrees, and the advantage of the angle is that accumulated water on the top surface of the curb is favorably drained, and the collision force generated during vehicle collision is reduced, so that the accident rate is reduced;
preferably, the prefabricated length of the UHPC hollow structure is 750 mm.
The invention adopts a buckle type structure form, strengthens the connection effect between the kerbs, reduces the transverse displacement, improves the overall performance of the hollow kerbs, simultaneously, the prefabricated length of the UHPC hollow structure is 750mm, not only can reduce the prefabrication and construction cost, but also can ensure that the fracture resistance of the kerbs meets the requirement of the specification of concrete kerbs, and has the best comprehensive benefit.
According to the checking calculation, when the bending strength of the UHPC is 25MPa, the bearing capacity can meet the standard requirement, the smaller the length is, the larger the bearing capacity is, however, the larger the length is, the larger the prefabrication and construction difficulty is, the factors of the bearing capacity and the prefabrication construction difficulty are comprehensively considered, and the optimal length of the kerbstone is 750 mm.
Preferably, the outer part of the UHPC hollow structure close to the turning part at the road side is also provided with a chamfer with the radius of 20 mm.
The construction method of the UHPC hollow curb comprises the following steps:
(1) producing moulds of the UHPC hollow structure and the mortar base in batches, prefabricating the UHPC hollow structure and the mortar base in batches in a factory, and performing standard maintenance for 28 days;
(2) pre-digging a groove with the depth of 150mm at the construction position of the curb for embedding a mortar base;
(3) sequentially laying a plurality of mortar base structures along the traveling direction, wherein adjacent mortar bases are laid next to each other;
(4) embedding the UHPC hollow structures into the grooves of the mortar base structures to ensure staggered joint installation, namely staggering the joints of two adjacent UHPC hollow structures and the joints of two adjacent mortar bases to limit respective transverse displacement; preferably, two adjacent UHPC hollow structures are also arranged next to each other;
(5) grouting once every 100m of curb is installed, namely injecting an adhesion material between the UHPC hollow structure and the mortar base, and inserting a grouting pipe into a gap between the UHPC hollow structure at the upper part and the mortar base for grouting until the slurry in the gap of the hollow curb is full;
(6) and maintaining for 7 days.
The construction of the hollow kerbstone adopts an assembly type implementation process, the upper part and the lower part of the kerbstone are prefabricated in parts at first and then are assembled alternately, the construction period is effectively shortened, and the aim of quick construction is fulfilled; meanwhile, a grouting mode is adopted to fill and adhere the gap between the upper part and the lower part of the kerbstone, so that the construction quality of the kerbstone is improved.
Preferably, the prefabricated UHPC hollow structure and the mortar base both need a mould, wherein the mould for prefabricating the UHPC hollow structure comprises an outer mould and an inner mould which are connected by screws, when the mould is inverted during pouring, the inner mould is taken out firstly, pouring is carried out towards the inner part of the outer mould, then the inner mould is buckled, the screws are screwed, and then the space between the inner mould and the outer mould is poured towards the surrounding space until the space between the inner mould and the outer mould is filled.
The present invention is not described in detail, and the prior art can be adopted.
The invention has the beneficial effects that:
1) compared with common concrete, the mechanical property and durability of the kerbstone are greatly improved by adopting the UHPC material to prepare the kerbstone, so that the service life of the kerbstone is greatly prolonged;
although the UHPC material has high manufacturing cost compared with common concrete, the upper part of the invention adopts a hollow structure to save materials and control cost, and simultaneously has the characteristic of reducing self weight and reduces construction difficulty; the invention improves the bearing performance of the kerbstone and prolongs the service life of the kerbstone, and the economic benefit of the invention is higher than that of the common concrete kerbstone in the whole life cycle of the kerbstone.
2) The UHPC hollow structure and the mortar base are prepared by using the tailing sand, the tailing sand is used as industrial solid waste to completely replace quartz sand, the industrial solid waste is effectively utilized, the preparation cost of the curb is reduced, compared with the traditional method, the manufacturing cost is lower, and the requirement of the pouring fluidity of the mold is met.
3) The UHPC hollow structure and the mortar base are connected in a buckling mode, on one hand, the upper portion and the lower portion of the UHPC hollow structure form a whole, the connection effect between the kerbs is enhanced, the transverse displacement is reduced, the overall performance of the hollow kerbs is enhanced, and the UHPC hollow structure is convenient to construct, implements a flow construction mode and improves the construction efficiency.
4) The reasonable curb prefabricating length is adopted, and the prefabricating and construction cost is reduced on the premise of ensuring that the curb meets the requirement of the anti-breaking performance.
5) The invention has simple structure, excellent performance and convenient construction, has better practical value compared with the common concrete curb, adopts an assembly type construction method, is convenient to transport, firstly performs the upper part and the lower part of the curb in parts, and then alternately assembles, effectively shortens the construction period and achieves the purpose of quick construction.
6) The gap between the upper part and the lower part of the kerbstone is filled and adhered by adopting a grouting mode, so that the construction quality of the kerbstone is improved.
7) The invention can not only improve the normal use performance and the durability of the kerbstone, but also has the characteristics of convenient construction, economy and practicability, and can be widely applied to highways and urban roads.
Drawings
FIG. 1 is a schematic structural view of a UHPC hollow structure;
FIG. 2 is a schematic structural view of a mortar base;
FIG. 3 is a schematic perspective view of a UHPC hollow curb;
FIG. 4 is a side view of a UHPC hollow curb;
FIG. 5 is a top view of a UHPC hollow curb;
FIG. 6 is a front view of a UHPC hollow curb;
FIG. 7 is a schematic diagram of a mold for producing a UHPC hollow structure;
in the figure, 1-UHPC hollow structure, 2-mortar base, 3-adhesion material.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific examples, but not limited thereto, and the present invention is not described in detail and is in accordance with the conventional techniques in the art.
Example 1:
a UHPC hollow curb, as shown in figures 1-7, comprises a prefabricated UHPC hollow structure 1 and a prefabricated mortar base 2, wherein the UHPC hollow structure and the mortar base are fixedly connected through an adhesion material 3;
the UHPC hollow structure 1 is made of an ultrahigh-performance concrete material and comprises cement, mineral powder, silica fume, polyvinyl alcohol fibers, water, a high-efficiency water reducing agent and tailing sand, and has the characteristics of high compactness, good mechanical property and high durability, the UHPC hollow structure is integrally of an inverted U-shaped structure, the total height of the UHPC hollow structure is 250mm, the total width of the UHPC hollow structure is 200mm, the thickness of the UHPC hollow structure is 25mm, a mortar base is of a double-groove structure, the total height of the UHPC hollow structure is 75mm, the total width of the UHPC hollow structure is 300mm, the prefabricated length of the UHPC hollow structure is 500mm, double grooves are symmetrically distributed, and the UHPC hollow structure is clamped in the double-groove structure. The adhesion material is cast in the gap between the UHPC hollow structure and the mortar base in site during construction, and the UHPC hollow structure and the mortar base are prefabricated by a factory before construction.
The mortar base 2 is prefabricated by adopting M20 grade tailing mortar, the adhesion material 3 is cement paste with a water cement ratio of 0.5, and the mass mixture ratio is cement: water 1: 0.5.
the ultra-high performance concrete (UHPC) is a novel gelled composite material based on a particle tight packing theory and a hybrid fiber reinforced and toughened mechanism, adopts steel fibers as main reinforced fibers, and has excellent mechanical properties and durability compared with the traditional concrete. The compressive strength can reach 200 MPa. Meanwhile, UHPC also exhibits excellent durability due to its low water-to-gel ratio, microcracking effect, and self-healing capability. Based on the excellent mechanical property and durability of the UHPC, the UHPC is selected to replace common concrete to be used for manufacturing the curb, so that the service performance of the curb can be prolonged, and the life cycle cost of the curb is greatly reduced. On the basis, the hollow kerbstone structure is designed, reasonable thickness of the kerbstone is adopted, so that the bearing capacity of the kerbstone can meet the standard requirement, the material consumption can be reduced, the self weight of the kerbstone is reduced, and the transportation difficulty and the construction cost are reduced.
Example 2:
a UHPC hollow kerb, as described in example 1, except that the depth and width of the double grooves in mortar bed 2 were 25mm, the grooved edges were 50mm from the outer edge of the mortar bed.
In the UHPC hollow structure 1, the mass ratio of cement, mineral powder, silica fume, fiber, water, high-efficiency water reducing agent and tailing sand is 1: 0.56: 0.19: 0.02: 0.29: 0.06: 1, wherein the fiber is PVA fiber produced by Colorado, Japan, and the tailing sand is 80-130 meshes.
Because the wall thickness of the hollow curb is smaller, the requirement on the working performance of the mixture is higher when the hollow curb is cast and prefabricated in a mold, the water-cement ratio in the mixing ratio is 0.16, the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, the water reducing rate is about 30%, the fluidity of the mixture is better, and the working performance meets the construction requirement.
In the embodiment, the compressive strength of the UHPC is 100MPa, the flexural strength is 20MPa, when the wall thickness of the hollow kerbstone is 25mm, and the length is 750mm, the bearing capacity of the UHPC hollow kerbstone reaches 2.5-4 times of that of the common concrete (the compressive strength is 30MPa, and the flexural strength is 3.5MPa) solid kerbstone, so that the bearing capacity of the kerbstone is improved, the preparation raw materials can be saved, the dead weight of the kerbstone is reduced, and the transportation difficulty and the construction cost are reduced.
The UHPC is used for preparing the kerbstone based on the UHPC compact packing effect and the microcrack effect, so that the mechanical property and the durability of the kerbstone are enhanced, the service life of the kerbstone is greatly prolonged, and the life cycle cost is reduced;
in the invention, PVA is adopted to prepare UHPC, and in order to meet the construction requirement of the UHPC hollow kerbstone, UHPC with the fluidity of 150mm and above is adopted;
example 3:
a UHPC hollow kerbstone, as in example 2, except that the tailing mortar of the mortar bed is cement: tailing sand: water 1: 4.03: 0.89.
the UHPC hollow structure and the mortar base both use the tailing sand which is industrial solid waste, so that the problem of low utilization rate of the tailing sand is solved, the tailing sand can completely replace quartz sand in the traditional UHPC mixture ratio, and the quartz sand plays a role of filling a framework in an UHPC system, the grain diameter and hardness of the tailing sand are similar to those of the quartz sand, the quartz sand can be replaced in equal amount, and the preparation cost of the UHPC is reduced by about 15%;
example 4:
a UHPC hollow kerbstone, as in embodiment 3, except that the inner turning part of the UHPC hollow structure 1 is provided with a chamfer with a radius of 10 mm.
The upper half part of the side, close to the road side, of the UHPC hollow structure 1 is provided with a certain inclination angle, the inclination angle is 5 degrees, and the advantage of the inclination angle is that accumulated water on the top surface of the curb is favorably drained, and the collision force generated during vehicle collision is reduced, so that the accident rate is reduced;
the outer part of the UHPC hollow structure 1 close to the turning part at the road side is also provided with a chamfer with the radius of 20 mm.
The prefabricated length of the UHPC hollow structure is 750 mm.
The invention adopts a buckle type structure form, enhances the connection effect between the kerbs, reduces the transverse displacement, and improves the overall performance of the hollow kerbs, and meanwhile, the prefabricated length of the UHPC hollow structure is 750mm, thereby not only reducing the prefabrication and construction cost, but also ensuring that the anti-bending performance of the kerbs meets the standard requirement of concrete kerbs, and having the best comprehensive benefit.
According to the checking calculation, when the bending strength of the UHPC is 25MPa, the bearing capacity can meet the standard requirement, the smaller the length is, the larger the bearing capacity is, however, the larger the length is, the larger the prefabrication and construction difficulty is, the factors of the bearing capacity and the prefabrication construction difficulty are comprehensively considered, and the optimal length of the kerbstone is 750 mm.
Example 5:
a construction method of UHPC hollow kerbstone comprises the following steps:
(1) producing moulds of the UHPC hollow structure and the mortar base in batches, prefabricating the UHPC hollow structure 1 and the mortar base 2 in batches in a factory, and performing standard maintenance for 28 days;
(2) pre-digging a groove with the depth of 150mm at the construction position of the curb for embedding a mortar base;
(3) sequentially laying a plurality of mortar base structures along the driving direction;
(4) embedding the UHPC hollow structures 1 into the grooves of the mortar bases 2 to ensure staggered joint installation, namely mutually staggering the joints of two adjacent UHPC hollow structures and the joints of two adjacent mortar bases to limit respective transverse displacement;
(5) grouting once every 100m of curb is installed, namely injecting an adhesion material between the UHPC hollow structure and the mortar base, and inserting a grouting pipe into a gap between the UHPC hollow structure at the upper part and the mortar base for grouting until the slurry in the gap of the hollow curb is full;
(6) and maintaining for 7 days.
The construction of the hollow kerbstone adopts an assembly type implementation process, the upper part and the lower part of the kerbstone are prefabricated in parts at first and then are assembled alternately, the construction period is effectively shortened, and the aim of quick construction is fulfilled; meanwhile, a grouting mode is adopted to fill and adhere the gap between the upper part and the lower part of the kerbstone, so that the construction quality of the kerbstone is improved.
Example 6:
a construction method of a UHPC hollow curb is different from that of embodiment 5 in that a prefabricated UHPC hollow structure and a mortar base both need a mold, wherein the mold for prefabricating the UHPC hollow structure comprises an outer mold and an inner mold which are connected by screws, the mold is inverted during pouring, the inner mold is taken out firstly, pouring is carried out towards the inner part of the outer mold, then the inner mold is buckled, the screws are screwed, and then the surrounding gap is poured until the gap between the inner mold and the outer mold is filled.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A UHPC hollow curb is characterized by comprising a prefabricated UHPC hollow structure and a prefabricated mortar base, wherein the UHPC hollow structure and the mortar base are fixedly connected through an adhesion material;
the UHPC hollow structure is made of an ultrahigh-performance concrete material and comprises cement, mineral powder, silica fume, polyvinyl alcohol fibers, water, a high-efficiency water reducing agent and tailing sand, the whole structure is of an inverted U-shaped structure, the mortar base is of a double-groove structure, and the UHPC hollow structure is clamped in the double-groove structure.
2. The UHPC hollow curb of claim 1, wherein the mortar base is prefabricated from tailing mortar;
the adhesion material is cement paste with a water-cement ratio of 0.5.
3. The UHPC hollow curb of claim 2 wherein the double grooves on the mortar bed are 25mm deep and wide, and the notched edges are 50mm from the outer edge of the mortar bed.
4. The UHPC hollow curb of claim 1, wherein in the UHPC hollow structure, the mass ratio of cement, mineral powder, silica fume, fiber, water, high efficiency water reducing agent and tailing sand is 1: 0.56: 0.19: 0.02: 0.29: 0.06: 1, wherein the fiber is PVA fiber, and the tailing sand is 80-130 meshes;
preferably, the compressive strength of the UHPC is 80-120MPa, the breaking strength is 20-25MPa, and the fluidity reaches 150mm or more.
5. The UHPC hollow curb of claim 2, wherein the tailing mortar of the mortar bed has a mass mix ratio of cement: tailing sand: 1 in water: 4.03: 0.89.
6. the UHPC hollow curb of claim 4, characterized in that, the UHPC hollow structure thickness is 15 ~ 25mm, preferably 25mm, and its inside turning department is provided with the chamfer, and the chamfer radius is 10 mm.
7. A UHPC hollow kerbstone according to claim 6, wherein the upper half of the side of the UHPC hollow structure near the roadside has an inclination angle of 4-6 °, preferably 5 °;
preferably, the prefabricated length of the UHPC hollow structure is 750 mm.
8. The UHPC hollow curb of claim 7, wherein the outside of the UHPC hollow structure is also provided with a chamfer with a radius of 20mm near the turning of the roadside.
9. A construction method of the UHPC hollow kerb according to claim 8, comprising the steps of:
(1) prefabricating UHPC hollow structures and mortar bases in batches in a factory, and performing standard maintenance for 28 days;
(2) pre-digging a groove with the depth of 150mm at the construction position of the curb for embedding a mortar base;
(3) sequentially laying a plurality of mortar base structures along the driving direction;
(4) embedding the UHPC hollow structures into the grooves of the mortar base structures to ensure staggered joint installation, namely staggering the joints of two adjacent UHPC hollow structures and the joints of two adjacent mortar bases;
(5) grouting once every 100m of curb is installed, namely injecting an adhesion material between the UHPC hollow structure and the mortar base until the slurry in the gap of the hollow curb is full;
(6) and maintaining for 7 days.
10. The construction method of the UHPC hollow curb according to claim 9, characterized in that in the step (1), the prefabricated UHPC hollow structure and the mortar base both need a mold, wherein the mold for prefabricating the UHPC hollow structure comprises an outer mold and an inner mold, the outer mold and the inner mold are connected by screws, when pouring, the mold is inverted, the inner mold is taken out, pouring is carried out towards the inside of the outer mold, then the inner mold is buckled, the screws are screwed, and then pouring is carried out to the surrounding gap until the gap between the inner mold and the outer mold is filled.
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| CN202210522869.7A CN114855542A (en) | 2022-05-13 | 2022-05-13 | UHPC hollow curb and construction method thereof |
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| CN116289393A (en) * | 2022-09-09 | 2023-06-23 | 山东大学 | Thin-wall structure for curb film and renovating and repairing construction method |
| CN116354657A (en) * | 2023-03-23 | 2023-06-30 | 桂林理工大学 | Preparation method of high-strength UHPC hollow thin-wall structured curbstone |
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| CN116354657A (en) * | 2023-03-23 | 2023-06-30 | 桂林理工大学 | Preparation method of high-strength UHPC hollow thin-wall structured curbstone |
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