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Method for reinforcing underwater concrete structure by ultrahigh-performance concrete

An underwater concrete and concrete reinforcement technology, which is applied in the repair of infrastructure, infrastructure engineering, construction, etc., can solve the problems of unsatisfactory reinforcement effect, high construction cost, and long construction period, so as to improve the underwater anti-dispersion ability , eliminating the need for planting bars, good bonding performance

Active Publication Date: 2019-05-24
SHANGHAI MUNICIPAL ENG DESIGN INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of long construction period, high construction cost and unsatisfactory reinforcement effect in existing methods for strengthening underwater concrete structures. Concrete reinforcement method for underwater concrete structure, the invention has the advantages of simple and convenient reinforcement method, significantly improved bearing capacity and durability of reinforced concrete structure, etc.

Method used

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  • Method for reinforcing underwater concrete structure by ultrahigh-performance concrete
  • Method for reinforcing underwater concrete structure by ultrahigh-performance concrete
  • Method for reinforcing underwater concrete structure by ultrahigh-performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1, a kind of ultra-high-performance concrete that strengthens underwater concrete structure, by cement (42.5 grade Portland cement) 100, slag powder (S105 grade) 25, fly ash 15, silica fume 15, quartz sand 55, Quartz powder 36, limestone powder 25, steel fiber (length 18mm, diameter 0.25mm hook-end steel fiber) 17.8, viscosity regulator (hydroxypropyl methyl cellulose ether with a viscosity value of 8000MPa s) 0.06, water reducing The weight ratio of agent (powder) 1.5, defoamer (powder) 0.2 and water 27 weighs the raw materials respectively, and then cement, mineral powder, fly ash, silica fume, quartz sand, quartz powder, limestone powder, viscosity The conditioner, water reducer, and defoamer are added to the forced mixer for pre-mixing, and then water is added to the mixing pot at one time and continued to stir. When the mixture is in a uniform flow state, steel fibers are added and mixed. In the mixture, continue to stir until the mixture is uniform to o...

Embodiment 2

[0059] Embodiment 2, a kind of ultra-high-performance concrete that strengthens underwater concrete structure, according to cement (52.5 grade Portland cement) 100, slag powder (S95 grade) 40, fly ash 17, silica fume 32, quartz sand 75, Quartz powder 50, limestone powder 30, steel fiber (long straight steel fiber with a length of 19 mm and a diameter of 0.22 mm) 30.5, viscosity regulator (hydroxypropyl methyl cellulose ether with a viscosity value of 8000 MPa s) 0.11, water reducing The weight ratio of agent (liquid) 2.0, defoamer (liquid) 0.3 and water 36 is respectively weighed raw materials, and then cement, mineral powder, fly ash, silica fume, quartz sand, quartz powder, limestone powder and viscosity modifier Add them together to the forced mixer for pre-mixing, then add the water mixed with water reducing agent and defoamer into the mixing pot at one time and continue stirring. When the mixture is in a uniform flow state, add steel fiber and mix. In the mixture, continu...

Embodiment 3

[0060] Embodiment 3, a kind of ultra-high-performance concrete that strengthens underwater concrete structure, according to cement (52.5 grade ordinary Portland cement) 100, mineral powder (S95 grade) 50, fly ash 20, silica fume 40, quartz sand 90 , quartz powder 60, limestone powder 44, steel fiber (long straight steel fiber with length 16mm, diameter 0.18mm and end hook steel fiber with length 16mm, diameter 0.20mm are used in a weight ratio of 4:6) 38.5, viscosity Regulator (hydroxypropyl methyl cellulose ether with a viscosity value of 40000MPa s) 0.16, water reducer (liquid) 2.4, defoamer (liquid) 0.4 and water 39 weight ratio Weigh raw materials respectively, and then cement , slag powder, fly ash, silica fume, quartz sand, quartz powder, limestone powder and viscosity regulator are added to the forced mixer for pre-mixing, and then the water mixed with water reducer and defoamer is added at one time Stir in the pot and continue to stir. When the mixture is in a uniform ...

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Abstract

The invention belongs to the technical field of concrete structural maintenance and reinforcement and particularly relates to a method for reinforcing underwater concrete structure by ultrahigh-performance concrete. The method is characterized by including steps of to-be-reinforced area surface clearing, to-be-reinforced concrete structure basic cleaning, reinforcement cage placement, form plate mounting, gravel and aggregate pouring, underwater rapid-hardening mortar pouring, ultrahigh-performance concrete pouring and form removal after curing. The method has advantages of simplicity, convenience, remarkable improvement of bearing capacity and durability of the reinforced concrete structure, and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete structure maintenance and reinforcement, and in particular relates to a method for reinforcing underwater concrete structures by using ultra-high performance concrete. Background technique [0002] Underwater concrete structures are vulnerable to damage due to water flow erosion, harmful ion erosion, and collisions, especially for water level change areas, which are also subject to alternating dry and wet cycles and freeze-thaw cycles, so the damage is more serious , which in turn leads to the reduction of the bearing capacity and durability of the underwater concrete structure, threatening the safe use of its superstructure. At present, the main method for maintenance and reinforcement of damaged parts of underwater concrete is the method of enlarging the section. The period is long and the cost is high, while the latter needs to build a large area of ​​construction work surface, and in order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D37/00E02D15/06C04B28/04
CPCY02W30/91
Inventor 水亮亮郑晓光陈亚杰吴立报
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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