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CN-121992697-A - Stone slab pavement structure with high shearing resistance and construction method thereof

CN121992697ACN 121992697 ACN121992697 ACN 121992697ACN-121992697-A

Abstract

The invention relates to a stone slab pavement structure with high shearing resistance and a construction method thereof, wherein the stone slab pavement structure comprises a stone slab surface layer, a mortar cushion layer, a cement concrete leveling layer and a subbase layer which are sequentially arranged from top to bottom; the stone slab surface layer consists of at least two stone slabs, the adjacent stone slabs are bonded through bonding layers, the bonding layers are modified UHPC joint filling bonding layers, and the joint positions on two sides of the stone slabs are subjected to high-pressure water jet rough interface treatment. According to the invention, the modified UHPC joint filling bonding layer is arranged in the stone slab pavement, so that the pavement structure has the advantages of high bonding performance, strong shearing resistance, good durability, remarkable water resistance and wear resistance and the like, has the characteristics of high joint filling forming speed and simple construction equipment, solves the problem that the joint interface is cracked and sheared again rapidly after the stone slab pavement is paved in the prior art, and can effectively improve the pavement structure overall performance of the urban stone slab pavement.

Inventors

  • WANG LINBIN
  • Zhai Chuangyou
  • XI YU
  • CHEN WEIHUA
  • LIU XI
  • LIU MING

Assignees

  • 广州市市政工程试验检测有限公司

Dates

Publication Date
20260508
Application Date
20260210

Claims (10)

  1. 1. The stone slab pavement structure with the high shearing resistance is characterized by comprising a stone slab surface layer, a mortar cushion layer, a cement concrete leveling layer and a subbase layer which are sequentially arranged from top to bottom; the stone slab surface layer consists of at least two stone slabs, the adjacent stone slabs are bonded through bonding layers, the bonding layers are modified UHPC joint filling bonding layers, and the joint positions on two sides of the stone slabs are subjected to high-pressure water jet rough interface treatment.
  2. 2. The stone slab pavement structure according to claim 1, wherein stone slabs of the stone slab surface layer are marble natural surface stone slabs, the length of each stone slab is 200-250 mm, the width of each stone slab is 200-250 mm, the thickness of each stone slab is 180-200 mm, and the length-height ratio of each stone slab is more than or equal to 1.0.
  3. 3. The slate pavement structure according to claim 1 or 2, characterized in that the bonding layer is made of modified UHPC caulking material, and the doping amount of modified polymer of the modified UHPC caulking material is more than or equal to 0.49%; Preferably, the 28d compressive strength of the bonding layer is 110-140 MPa, the bonding shear strength with the stone slab surface layer is 2.4-3.0 MPa, and the maximum in-situ shearing vertical deformation is less than or equal to 0.02mm.
  4. 4. The slate pavement structure of any one of claims 1-3, characterized in that the 28d compressive strength of the mortar cushion layer is 35-42 mpa, and the flexural strength is 4.0-4.8 mpa; Preferably, the thickness of the mortar cushion layer is 20-50 mm.
  5. 5. The slate pavement structure of any of claims 1-4, wherein the cement concrete leveling layer is a C40 fine stone concrete layer; preferably, the 28d compressive strength of the cement concrete leveling layer is 48-55 MPa, and the flexural strength is 3.8-4.5 MPa; Preferably, the thickness of the cement concrete leveling layer is 40-90 mm.
  6. 6. The slate pavement structure of any of claims 1-5, wherein the underlayment is a C25 plain concrete layer; preferably, the 28d compressive strength of the subbase layer is 30-36 MPa, and the flexural strength is 2.6-2.9 MPa; Preferably, the thickness of the subbase layer is 80-180 mm.
  7. 7. A method of constructing a flagstone road structure as claimed in any one of claims 1 to 6, wherein the method of construction comprises the steps of: (1) Sequentially casting a cement concrete leveling layer and a mortar cushion layer on the upper part of the subbase layer; (2) The mortar cushion layer is cleaned, and the size and the paving area of the stone plate are designed; (3) Carrying out high-pressure water jet rough interface treatment on the side surface of the stone slab, and paving the stone slab; (4) Filling a joint filling device with a modified UHPC joint filling material to the joint positions of adjacent stone plates, and forming a modified UHPC joint filling bonding layer after condensation; (5) And (3) carrying out fire surface treatment on the surface of the stone slab surface layer, and opening traffic after health maintenance to finish stone slab pavement structure construction.
  8. 8. The method of claim 7, wherein the cleaning treatment of step (2) comprises a finisher surface polishing and a blower dust removal and moisture removal treatment.
  9. 9. The construction method according to claim 7 or 8, wherein the water pressure of the high-pressure water jet rough interface treatment in the step (3) is 120-130 mpa, and the water flow is 140-200 l/s; Preferably, the sand filling depth of the rough interface after the high-pressure water jet rough interface treatment is 2.4-4.0 mm.
  10. 10. The construction method according to any one of claims 7 to 9, wherein the modified UHPC joint filling material comprises, by mass, 24.27% -28.22% of cement, 3.64% -4.52% of silica fume, 3.03% -3.76% of microbeads, 6.07% -11.29% of quartz powder, 36.41% -41.38% of quartz sand, 7.28% -9.41% of water, 0.49% -0.94% of modified polymer and 0.48% -0.61% of high-efficiency water reducer; Preferably, the concrete operation of the step (4) is that the modified UHPC joint filling material is filled into a material cylinder of the joint filling device by adjusting a grouting pump, the joint filling device is started, a discharge hole at the end part of a connecting pipe corresponds to the joint position, the joint filling device is moved to continuously and uniformly fill the modified UHPC joint filling material into the joint position, the joint position which is longitudinally arranged is firstly filled, then the joint position which is transversely arranged is filled, after the interior of the joint position is completely filled, a scraper is used for trimming and trowelling the modified UHPC joint filling material before the modified UHPC joint filling material is not dried, and redundant materials are collected, and the setting time is not less than 24 hours, so that a modified UHPC joint filling bonding layer is formed; Preferably, the flame temperature of the fire surface treatment in the step (5) is more than or equal to 1500 ℃, the moving speed of a spray gun for the fire surface treatment is 20-30 cm/s, and the distance between the spray gun and the surface of the stone slab is 150-250 mm.

Description

Stone slab pavement structure with high shearing resistance and construction method thereof Technical Field The invention relates to the technical field of road engineering construction, in particular to a stone slab pavement structure with high shearing resistance and a construction method thereof. Background The stone slab pavement is widely applied to urban roads, and the structural form and the construction method are continuously innovated and improved. However, under the multiple coupling actions such as driving load, environmental temperature and service life increase, the joint filling part between the stone slabs is gradually sheared and damaged, so that the bonding performance of the joint filling material is degraded and the interface is stripped, the strength of the structure is weakened to a certain extent, the problems such as pavement subsidence, uneven platform, unsmooth drainage, low-lying water accumulation and the like are frequently caused, and the service life of the stone slab pavement is seriously influenced. And the joint filling material causes the road surface water to continuously infiltrate into the inside of the structure, so that the road surface water continuously infiltrates downwards, the structural degradation is aggravated, and more diseases are derived. CN108625252a discloses a road paving construction method, which comprises (1) base layer treatment, (2) leveling and snapping, (3) trial assembly according to patterns, textures and colors of granite, and arranging the trial assembled granite according to two opposite directions, numbers, (4) brushing cement mortar and paving a mortar combining layer, (5) trial paving the granite layer, checking whether the mortar surface and the plate are matched, and (6) paving the granite layer, (7) pouring joints and pressing joints, pouring the prepared dilute cement paste into the gaps between the granite by adopting a small-mouth paste pot after paving, and (8) curing, after the joints are wiped by grouting for 24 hours, covering by using geotextile or clean fine sand, and spraying water for curing for not less than 7 days. CN117904919a discloses a construction method of a thin layer of UHPC (ultra-high performance concrete) cover applied to an old cement concrete pavement, which comprises the steps of paving a crack isolation layer on a crack of the old cement concrete pavement in advance for carrying out crack isolation construction, paving ultra-high performance concrete on the old cement concrete pavement after the crack isolation construction is finished to form a thin layer cover, adopting the UHPC (Ultra HighPerformance Concrete, ultra-high performance concrete) and the crack isolation layer as an anti-cracking structure of the thin layer cover, and adopting pavement grooving (full length or partial grooving along the crack) or/and the crack isolation layer to adapt to shrinkage and expansion of the concrete so as to prevent expansion of reflective cracks, wherein the pavement grooving is beneficial to avoiding buckling instability and failure of the thin layer cover of the UHPC and interlayer interface bonding failure caused by expansion of adjacent plates at the crack position of the old pavement. The conventional stone slab pavement joint filling materials and the construction method have the advantages that the joint filling grouting thickness is increased, and the geotechnical material layer is added to the bottom of the stone slab pavement structure in construction, so that the effect is not obvious. Therefore, aiming at the increasing problem of stone slab pavement diseases, development of a stone slab pavement with high shearing resistance and a construction method thereof are urgently needed, and the method has important engineering value for improving the service function and the service life cycle of the stone slab pavement and realizing efficient construction. Disclosure of Invention The invention provides a stone slab pavement structure with high shearing resistance and a construction method thereof, wherein the stone slab pavement structure remarkably improves comprehensive performance by arranging a modified UHPC joint filling bonding layer, the modified UHPC joint filling bonding layer not only has excellent bonding strength, shearing strength and durability, but also has outstanding waterproof and wear-resisting characteristics, and meanwhile, the stone slab pavement structure has the characteristics of rapid solidification and convenient construction, and effectively solves the problem that secondary cracking and shearing damage are easy to occur at joints of the existing stone slab pavement after pavement, thereby remarkably enhancing the structural integrity and stability of urban stone slab pavements. To achieve the purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides a stone slab pavement structure with high shear resistance, which comprises a stone slab