CN210947123U - Low-shrinkage type ultrahigh-strength concrete-reinforced concrete combined structure - Google Patents
Low-shrinkage type ultrahigh-strength concrete-reinforced concrete combined structure Download PDFInfo
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- CN210947123U CN210947123U CN201921531257.4U CN201921531257U CN210947123U CN 210947123 U CN210947123 U CN 210947123U CN 201921531257 U CN201921531257 U CN 201921531257U CN 210947123 U CN210947123 U CN 210947123U
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Abstract
The utility model relates to a low type that contracts super high-strength concrete-reinforced concrete integrated configuration, including reinforced concrete layer, reinforced concrete layer's single face or two-sided super high-strength concrete protective layer of low contractibility of having pour. The low-shrinkage type ultrahigh-strength concrete-reinforced concrete combined structure is simple in structure, corrosion damage of reinforcing steel bars is effectively delayed, and interface cracks generated due to inconsistent shrinkage of an ultrahigh-strength concrete protective layer and the reinforced concrete layer are inhibited.
Description
Technical Field
The utility model relates to a low type of contracting superelevation strong concrete-reinforced concrete integrated configuration.
Background
At present, the corrosion protection measures of the steel bars in the concrete are more in variety, and the concrete surface protection, the rust inhibitor, the steel bar electrochemical cathode protection, the steel bar surface coating and the like are common. The concrete surface protective coating has a plurality of varieties and excellent anti-corrosion performance, but has the defects of weak adaptability, more volatile organic compounds and serious threat to the ecological environment, and the environmental protection, high performance and functionalization are key directions for the development of the concrete anti-corrosion coating. The steel bar rust inhibitor can prevent or slow down the corrosion of steel bars, and the steel bar rust inhibitor is mainly used in sodium nitrite, sodium benzoate and the like at present, but in view of the negative influence on the concrete performance (such as setting time and strength), the calcium nitrite type rust inhibitor is forbidden to be used by some countries due to the strong toxicity. Therefore, the novel nontoxic and environment-friendly rust inhibitor is worthy of being deeply researched and popularized. Electrochemical cathodic protection can directly inhibit the electrochemical corrosion process of the steel bar, so that the steel bar is changed from an anode to a protected cathode, thereby preventing the steel bar from being corroded, and the electrochemical cathodic protection is successfully used for underground concrete pipelines, highway bridges and the like. However, the method requires special professionals for operation and maintenance, and the actual operation cost is high. The steel bar surface coating comprises a metal coating and a non-metal coating. The metal plating layer steel bar comprises copper-clad steel bar and hot-dip galvanized steel bar. However, galvanized steel bars are susceptible to corrosion by chloride ion corrosion, and the effect of inhibiting corrosion is not satisfactory. The non-metal coating is mostly used for sintering an epoxy resin coating, the epoxy resin coating has good corrosion resistance, but the bonding strength with concrete is obviously reduced, and the coating cannot have too many micropores and cracks, otherwise, the corrosion is accelerated. From the above, it can be seen that, at present, many scholars at home and abroad do a lot of research work on the corrosion of structural steel bars, and the problem of the corrosion of the steel bars cannot be thoroughly solved. The alleviation of the influence of corrosion of steel bars, the reduction of the construction cost of structural projects and the reduction of maintenance costs have become important issues that must be considered in the construction of various building projects and particularly marine major infrastructures in coastal areas.
The corrosion of the steel bars is the most influential factor in the deterioration of various building structures and infrastructure structures, and seriously affects the overall safety and the service performance of the engineering structure. In China, the direct economic loss caused by the corrosion damage of reinforced concrete every year accounts for 3-5% of the GDP in the same year, and is far greater than the total loss of natural disasters and various accidents. The corrosion of the steel bar is delayed or prevented, the durability and the service life of the infrastructure are improved, and the method is particularly important for the healthy development of national economy and social stability. Under severe environments such as ocean waves, tides, currents, salts, high temperature/freezing and the like, the phenomena of steel bar corrosion and concrete cracking and deterioration caused by the steel bar corrosion are very serious. Engineering research finds that serious steel bar corrosion damage generally occurs after a coastal concrete structure is put into use for 10-15 years according to infrastructure constructed by the existing materials, durability design specifications and test evaluation methods at home and abroad.
For a reinforced concrete structure, the main cause of corrosion of steel reinforcement is chloride corrosion. Therefore, the improvement of the chloride ion permeability resistance of the concrete is a main technical means for solving the durability of the reinforced concrete, and the scheme is generated.
SUMMERY OF THE UTILITY MODEL
In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a low-shrinkage type ultrahigh strength concrete-reinforced concrete composite structure.
In order to solve the technical problem, the technical scheme of the utility model is that: the low-shrinkage ultrahigh-strength concrete-reinforced concrete combined structure comprises a reinforced concrete layer, wherein a low-shrinkage ultrahigh-strength concrete protective layer is poured on one side or two sides of the reinforced concrete layer.
Preferably, the reinforced concrete layer comprises common concrete and internally embedded steel bars.
Preferably, the ultra-high-strength concrete protective layer is formed by pouring ultra-high-strength concrete doped with a proper amount of lightweight aggregate and shrinkage reducing agent.
Compared with the prior art, the utility model discloses following beneficial effect has: the low-shrinkage type ultrahigh-strength concrete-reinforced concrete combined structure is simple in structure, the ultrahigh-strength concrete protective layer has excellent chloride ion permeability resistance, the reinforced concrete layer is protected, and the corrosion damage of the reinforcing steel bars is effectively delayed.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram (single-sided protective layer) of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram (double-sided protection layer) of an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-2, a low shrinkage type ultra-high strength concrete-reinforced concrete composite structure comprises a reinforced concrete layer 1, wherein a low shrinkage ultra-high strength concrete protective layer 2 is poured on one side or both sides of the reinforced concrete layer. Compared with common concrete, the ultra-high strength concrete has excellent chloride ion permeability resistance, and the chloride ion permeability coefficient of the ultra-high strength concrete is two orders of magnitude lower than that of the common concrete. The ultra-high strength concrete is used as a protective layer of the reinforced concrete, so that the chloride ion permeability resistance of the reinforced concrete can be obviously improved, and the corrosion damage of the reinforcing steel bars is greatly slowed down.
In the embodiment of the present invention, the reinforced concrete layer includes the common concrete 3 and the internal embedded steel bar 4.
The embodiment of the utility model provides an in, because the cement ratio of super high strength concrete is extremely low, and has mixed a large amount of fine particle silica fume, its shrinkage value is far greater than ordinary concrete, and this will make super high strength concrete protective layer and ordinary reinforced concrete produce the shrinkage crack because of the shrink is inconsistent in the hardening process that condenses, consequently super high strength concrete protective layer is pour by the super high strength concrete who mixes proper amount lightweight aggregate and shrinkage reducing agent and is made, makes super high strength concrete protective layer and ordinary reinforced concrete keep close shrinkage value in the hardening process that condenses, restraines both interface cracks because of the inconsistent production of shrink, can be used to in coastal reinforced concrete structure.
A construction method of a low-shrinkage type ultrahigh-strength concrete-reinforced concrete composite structure is carried out according to the following steps: placing the ultra-high-strength concrete protective layer on one side of the reinforced concrete layer, pouring the ultra-high-strength concrete protective layer, and then pouring the reinforced concrete layer; if necessary, a layer of ultra-high strength concrete protective layer is poured to form double-sided protection.
In the embodiment of the present invention, the concrete with strength level C60 and above is generally called high-strength concrete, the concrete with strength level C100 is called ultra-high-strength concrete, and the ultra-high-strength concrete with low shrinkage formed by doping a proper amount of lightweight aggregate and shrinkage-reducing agent also belongs to the prior art (refer to "research and countermeasure of high-strength concrete shrinkage cracking" in "world homeland engineering technology", wen/zhang nations), so the ultra-high-strength concrete with low shrinkage belongs to the existing material.
The present invention is not limited to the above preferred embodiments, and any person can obtain various other types of low-shrinkage ultra-high strength concrete-reinforced concrete composite structures according to the teaching of the present invention. All the equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (3)
1. The utility model provides a low type of contracting super high strength concrete-reinforced concrete integrated configuration which characterized in that: the concrete is characterized by comprising a reinforced concrete layer, wherein a low-shrinkage ultrahigh-strength concrete protective layer is poured on one side or two sides of the reinforced concrete layer.
2. The low shrinkage type ultra-high strength concrete-reinforced concrete composite structure according to claim 1, wherein: the reinforced concrete layer comprises common concrete and internally embedded steel bars.
3. The low shrinkage type ultra-high strength concrete-reinforced concrete composite structure according to claim 1, wherein: the ultra-high-strength concrete protective layer is formed by pouring ultra-high-strength concrete doped with a proper amount of lightweight aggregate and shrinkage reducing agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921531257.4U CN210947123U (en) | 2019-09-16 | 2019-09-16 | Low-shrinkage type ultrahigh-strength concrete-reinforced concrete combined structure |
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| CN201921531257.4U CN210947123U (en) | 2019-09-16 | 2019-09-16 | Low-shrinkage type ultrahigh-strength concrete-reinforced concrete combined structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468954A (en) * | 2019-09-16 | 2019-11-19 | 福州大学 | Low-shrinkage type super high strength concrete-reinforced concrete composite structure and its construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468954A (en) * | 2019-09-16 | 2019-11-19 | 福州大学 | Low-shrinkage type super high strength concrete-reinforced concrete composite structure and its construction method |
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