CN104533104A - Method for improving concrete impact resistance strength through surface repairing thin layer - Google Patents

Abstract

The invention provides a method for improving concrete impact resistance strength through a surface repairing thin layer and belongs to the technical field of concrete structure reinforcement. According to the method, polyacrylonitrile short fiber and modified epoxide resin are utilized, the concrete structure surface is repaired through processes of multiple-layer adhesive applying, short fiber layering and the like so as to achieve the effect of improving the impact resistance strength of the concrete structure. The working procedures of the method are simple and convenient to implement, operation is easy, the impact resistance performance of the concrete structure can be obviously improved, reinforcement effect is excellent, stability is good, and the method has good application prospect.

Description

A kind of surface reconditioning thin layer improves the method for concrete impact-resistant hit intensity

Technical field

The invention belongs to Reinforcement Technology of Concrete Structure field.Be specifically related to a kind of high strength, high stability, operation easy fast, can the Reinforcement Technology of Concrete Structure method of mechanized operation.Compared to the Reinforcement Technology of Concrete Structure method of routine, the requirement that the method is efficient, high-strength, the advantage of high stability meets the concrete structure reinforcement marketization, has broad application prospects.

Background technology

A lot, stabilization works is also more extensive for the current technology about concrete structure reinforcement and related specifications.The method of wherein reinforcing roughly comprises: 1) increasing section reinforcing method; 2) coagulation local method is replaced; 3) additional prestressing; 4) fiber composite material reinforcing method is pasted; 5) affixing steel plate reinforcement method; 6) setting support reinforcing method.

Although above-mentioned reinforcement means can meet the index of concrete structure structural performance and shock resistance, from the viewpoint of technique and durability, also there is following problem, specific as follows:

1) easy stripping damage: the end of paste is easily stuck up out or adhesive glue unstable properties, and overall performance is deteriorated under harsh and unforgiving environments, easily causes the stripping damage of paste;

2) reinforcement material cost is high: the cost of cloth, fiberboard and steel plate is all higher than the price of short fiber;

3) complicated construction technique: paste in fiber composite material reinforcing method and affixing steel plate reinforcement method, fiber composite material and cutting out of steel plate make all more complicated, and structure dead angle is difficult; The construction sequence of increasing section reinforcing method, additional prestressing and setting support reinforcing method is loaded down with trivial details, and constructing operation level requirement is higher, and strengthening quality is all more difficult to get guarantee;

4) concrete structure applicability reduces: due to surface mount cloth or steel plate, and increasing section and setting support, the appearance changing works all in various degree, and it is poor to reinforce apparent effect, and structure applicability is reduced.

Summary of the invention

The object of the invention is to solve above-mentioned existing technical problem, the concrete structure restoring and fastening method that the application of creation is simple and practical, its feature is as follows:

1. application surface repairs the method that thin layer improves concrete impact-resistant hit intensity, it is characterized in that:

The index of quality of each component requires as follows:

Fiber: Orlon, fibre length is at 6 ~ 25mm, and diameter is 0.010 ~ 0.025mm; Volume is 10% ~ 30% of bonding adhesive volume;

Bonding adhesive: utilize the bonding adhesive that pnenolic aldehyde amine hardener and nanometer calcium silicate powder modified epoxy are prepared;

Epoxy resin: model E-51;

Thinner: acetone; Addition content is 15% of E51 quality;

Pnenolic aldehyde amine hardener: density 0.9 ~ 1.1g/cm ³, viscosity 5000mPa.s, total amine value is 450+20 KOH mg/g; Addition content is 30% of E51 quality;

Filler: fine sand, 0.16 ~ 1.00mm continuous grading, fineness modulus is 1.6, and volume is 25% of E51 quality; Nanometer calcium silicate powder, fineness 3000 order, addition content is 15% of E51 quality; Rubber powder is the butyl rubber particle of waste tire of automobile grinding, fineness 50 order, and wherein acrylonitrile mass content is 33%, and addition content is 5% of E51 quality;

Reinforcing construction process is as follows:

Concrete structural surface process: loosening particle is removed in concrete structural surface polishing, and removes floating dust;

Adhesive: first acetone is put into E51 agitation and dilution, then nano-calcium carbonate, fine sand and rubber powder are put into, finally put into pnenolic aldehyde amine hardener, and agitated liquid is no less than 2min to uniform liquid, Adhesive completes;

First floor bonding adhesive: be that 1 ± 0.3mm is thick with the bonding adhesive on hairbrush even painted concrete surface;

Fibrage is laid: be paved with short fiber at the surface uniform of first floor glue, and it is whole surface to be leveled with a roller flattening-out;

Second layer bonding adhesive: at fiber layer surface spray paste stick, makes double-layer glue stick and fibrolaminar total thickness be 3 ± 0.5mm, and rear roller grinds flat surface, and bonding adhesive is uniformly distributed;

Concrete through surface reconditioning is taked waterproof measure, with sander, surfacing is smooth after more than maintenance 6h in an outdoor environment, thus obtain the concrete structure of surface reconditioning.

The present invention has well enriched existing reinforcement means, and innovate from the preparation of material and construction technology, major advantage is as follows:

1) consolidation effect is stablized: by the epoxyn of modification and concrete compatibility relatively good, mobility is strong, avoids the problems such as dead angle difficult treatment.Smear through multilayer, bonding adhesive penetrates into inside concrete, can have good bonding with concrete itself, and short fiber is the inside that there is bonding adhesive, structural strengthening is closely knit, superior in durability, eliminates the possibility of reinforcement material stripping damage, and consolidation effect is stablized;

2) material cost reduces: this technology instead of the reinforcement material such as cloth and steel plate by short fiber, the interpolation of the fillers such as fine sand, rubber powder and nano-calcium carbonate also reduces the cost of bonding adhesive, and method of operating simplifies, construction and material cost reduce greatly;

3) the simple and concrete shock resistance of construction technology improves: technique process is easy, easy to operate, is only coated with daub and paving fiber through multilayer, can mechanized construction; Fiber can be paved with concrete surface uniformly, and adhesive glue is through repeatedly leveling stone roller with a roller, can penetrate into concrete structure inside, and energy is abundant and fiber fusion, and overall performance, stability and strengthening quality can ensure, shock resistance largely improves;

4) apparent effective: this reinforcement material is transparent material, can ignore to the destruction of the apparent aesthetic effect of original structure, structure applicability is constant;

By above-mentioned material preparation and the innovation of construction technique, novel concrete structure repairing and reinforcing process can be invented.Simple process, easy to operate, and improve the requirement that shock resistance is good, efficient, high-strength, advantage that is high stability meets the structural strengthening marketization of concrete structure, have good application prospect.

Detailed description of the invention

In examples of implementation, raw material composition is as follows respectively:

C30 commercial concrete selected by concrete; For reaching good consolidation effect, enable together with adhesive glue and fiber effectively bond, bonding adhesive selects E-51 epoxy resin, pnenolic aldehyde amine hardener, acetone diluted agent, nanometer calcium silicate powder, rubber powder, fine sand and Orlon.Wherein, E-51 epoxy resin, viscosity 2500mPa.s when 23 DEG C; Pnenolic aldehyde amine hardener, model T-5, Henan natural selection Industrial Co., Ltd., outward appearance brownish red transparency liquid, density 0.9 ~ 1.1g/cm ³, viscosity 5000mPa.s, total amine value is 450+20 KOH mg/g; The diameter of Orlon has selected 0.010mm, 0.015mm and 0.025mm, and fibre length has selected 6mm, 15mm and 25mm, and the volume volume of fiber is 10%, 20% and 30% of bonding adhesive volume; Fine sand, 0.16 ~ 1.00mm continuous grading, fineness modulus is 1.6; Nanometer calcium silicate powder, fineness 3000 order, calcium carbonate content 99%, density 2.7g/cm ³; Rubber powder, the butyl rubber particle of waste tire of automobile grinding, fineness 50 order, acrylonitrile content 33%, density 1g/cm ³; The proportioning of structure glue is E-51: thinner: curing compound: nanometer calcium silicate powder: rubber powder: fine sand=1.00:0.15:0.30:0.15:0.05:0.25, the mechanical property of bonding adhesive: tensile strength is 41MPa, tension modulus of elasticity is 2620MPa, compressive strength is 75MPa, is 2.6MPa (concrete cohesional failure) with concrete adhesion strength of just drawing.

Test adopts drop hammer type shock test:

Test be divided into three groups: group 1 for fiber volume volume be 10%; Group 2 for fiber volume volume be 20%; Group 3 for fiber volume volume be 30%.

Metal cylinder mould is selected in die trial, is of a size of Φ 150mm ± 1mm, high 35mm ± 0.5mm; Make C30 concrete test block with reference to " ordinary concrete mechanical test method " (GB/T 50081-2002), under concrete test block standard conditions after maintenance 28d, surface finish removing is loosened particle and floating dust; By first floor glue uniform application to the concrete surface cleaned out, fiber is evenly paved with concrete surface simultaneously, and it is whole with cylinder roller flattening-out, after first floor glue is completely dry, again epoxy resin is sprayed onto concrete surface, and make surface of test piece smooth with cylinder roller stone roller, under normal temperature outdoor environment after maintenance 6h, with sander, surface of test piece is polished flat; Process of the test performs with reference to " epoxy resin mortar tecnical regulations " (DL/T5193-2004).

The test result of embodiment is as shown in table 1 ~ 3.

Table 1 group 1 elastic modulus of concrete experimental test result

Table 2 group 2 elastic modulus of concrete experimental test result

Table 3 group 3 elastic modulus of concrete experimental test result

Experimental result can significantly be found out: after the reinforcing of the method, and concrete shock resistance significantly improves.The method that application surface reconditioning thin layer improves concrete impact-resistant hit intensity is a kind of simple and easy, efficient concrete structure restoring and fastening method, can promote the use of.

Claims (1)

1. application surface repairs the method that thin layer improves concrete impact-resistant hit intensity, it is characterized in that:

The index of quality of each component requires as follows:

Fiber: Orlon, fibre length is at 6 ~ 25mm, and diameter is 0.010 ~ 0.025mm; Volume is 10% ~ 30% of bonding adhesive volume;

Bonding adhesive: utilize the bonding adhesive that pnenolic aldehyde amine hardener and nanometer calcium silicate powder modified epoxy are prepared;

Epoxy resin: model E-51;

Thinner: acetone; Addition content is 15% of E51 quality;

Pnenolic aldehyde amine hardener: density 0.9 ~ 1.1g/cm ³, viscosity 5000mPas, total amine value is 450+20KOHmg/g; Addition content is 30% of E51 quality;

Filler: fine sand, 0.16 ~ 1.00mm continuous grading, fineness modulus is 1.6, and volume is 25% of E51 quality; Nanometer calcium silicate powder, fineness 3000 order, addition content is 15% of E51 quality; Rubber powder is the butyl rubber particle of waste tire of automobile grinding, fineness 50 order, and wherein acrylonitrile mass content is 33%, and addition content is 5% of E51 quality;

Reinforcing construction process is as follows:

Concrete structural surface process: loosening particle is removed in concrete structural surface polishing, and removes floating dust;

Adhesive: first acetone is put into E51 agitation and dilution, then nano-calcium carbonate, fine sand and rubber powder are put into, finally put into pnenolic aldehyde amine hardener, and agitated liquid is no less than 2min to uniform liquid, Adhesive completes;

First floor bonding adhesive: be that 1 ± 0.3mm is thick with the bonding adhesive on hairbrush even painted concrete surface;

Fibrage is laid: be paved with short fiber at the surface uniform of first floor glue, and it is whole surface to be leveled with a roller flattening-out;

Second layer bonding adhesive: at fiber layer surface spray paste stick, makes double-layer glue stick and fibrolaminar total thickness be 3 ± 0.5mm, and rear roller grinds flat surface, and bonding adhesive is uniformly distributed;

Concrete through surface reconditioning is taked waterproof measure, with sander, surfacing is smooth after more than maintenance 6h in an outdoor environment, thus obtain the concrete structure of surface reconditioning.