CN104987010A - Nanometer non-shrinkage repair concrete - Google Patents

Abstract

The invention discloses nanometer non-shrinkage repair concrete which is quick in early strength, good in cohesiveness with a base body, high in compactness, free of cracking and resistant to corrosion. The nanometer non-shrinkage repair concrete comprises, by mass, 35%-45% of cement, 25%-42% of medium sand, 15%-25% of coarse aggregate, 0.5%-1% of high-efficiency slushing agent, 3-4% of expanding agent, 2%-5% of nanoscale ground calcium carbonate, 1%-2% of concrete nanometer slushing super high-early-strength agent and 1%-2% of rust inhibitor. The concrete nanometer slushing super high-early-strength agent comprises, by mass, 46%-52% of early-strength components, 26%-32% of slushing components, 6%-15% of rust inhibiting components, 4%-5% of retarding components and 6%-8% of nanoscale ground calcium carbonate.

Description

Nanometer ungauged regions repairing concrete

Technical field

The invention belongs to repairing concrete material field, be specifically related to a kind of morning strong fast, with base bonding property is good, degree of compactness is high, do not ftracture, the nanometer ungauged regions of rust protection rushes to repair concrete.Be mainly used in the rapid rush-repair construction of the concrete works such as road, bridge.

Background technology

Repairing concrete construction is convenient, the duration is short, is widely used in the repairing of engineering, rush construction, rapid construction.The rapid rush-repair of such as motorway, common road cement pavement, the salvaging of concrete-bridge, the studying for a second time courses one has flunked fast of concrete road surface, airport.But along with the concrete extensive application of repairing, some drawbacks also highlight.First, repairing concrete has contraction in various degree in condensing process, and this contraction can cause surface layer to ftracture, and departs from repairing matrix.The corrosion that cracking also will cause external environment to reinforcing bar, unfavorable to structure durability.Secondly, the repairing concrete strength lift velocity of application is at present slow, and cause duration progress slow, meanwhile, after construction, curing time easily causes sleet environment to the disadvantageous effect of construction quality slowly.In addition, repairing position is the weak area that structure resists the erosion of extraneous poor environment, and tradition repairing concrete density is low, does not also protect the measure of inner reinforcing bar, easily causes the corrosion of repairing part interior reinforcing bar.

Chinese patent application publication No. CN00116214.4 discloses a kind of ultra early-strength grouting material, is made up of cement, sand, hardening accelerator, acceleration of hydration agent, retardant and water reducer.Have good fluidity, construction technology is simple, feature with low cost.But this material has much very important drawback, the first, retardant too much in material can cause grouting material gain in strength slow, affects duration progress, too increases the probability that extraneous undesirable element affects construction quality.The second, this material ultimate compression strength lower (20MPa), is not suitable for as the case of heavy load such as bridge, airstrip, easily causes the man-made further destroy repairing position.3rd, this material can shrink cracking in process of setting, and can cause the cracking of disengaging with matrix and surface layer, construction quality cannot be guaranteed.Finally, this invention belongs to pouring mortar field among a small circle, is not suitable for the large area repair repairing works such as such as road, bridge, airport.

Summary of the invention

The present invention is the above-mentioned technical problem in order to solve existing for prior art, provide a kind of morning strong fast, with base bonding property is good, degree of compactness is high, do not ftracture, the nanometer ungauged regions of rust protection rushes to repair concrete.

Technical solution of the present invention is: a kind of nanometer ungauged regions repairing concrete, it is characterized in that being made up of cement, medium sand, coarse aggregate, high efficiency water reducing agent, swelling agent, nano level water-ground limestone, concrete nanometer diminishing super instant coagulant and rust inhibitor, the mass percent of each component is as follows: cement 35 ~ 45%, medium sand 25 ~ 42%, coarse aggregate 15 ~ 25%, high efficiency water reducing agent 0.5 ~ 1%, swelling agent 3 ~ 4%, nano level water-ground limestone 2 ~ 5%, concrete nanometer diminishing super instant coagulant 1 ~ 2%, rust inhibitor 1 ~ 2%; In described concrete nanometer diminishing super instant coagulant, the mass percent of each component is as follows: accelerating component 46% ~ 52%, diminishing component 26% ~ 32%, resistance rust component 6% ~ 15%, slow setting component 4% ~ 5%, nano level water-ground limestone 6% ~ 8%.

Described cement is ordinary portland cement, is preferably 42.5#, 52.5# cement, forms the concrete gelling material of repairing by it.

Described medium sand is fineness modulus is 2.3 ~ 3.0, and median size is the sand of 0.35 ~ 0.5mm.

At least one in the rubble of described coarse aggregate to be particle diameter be 18 ~ 22mm or granite.

Described high efficiency water reducing agent is the one in naphthalene sulphur series high-efficiency water-reducing agent or High Efficient Diswater, can reduce water consumption, reduces water cement ratio, thus reduces Shrinkage Cracking of Concrete.

Described swelling agent is alumite plumping agent, U-(I II III) one of the cement expansive material such as type swelling agent, sulphoaluminate expander, ZY swelling agent, composite expanding agent, bulking agent of calcium aluminate; The expansion of swelling agent can offset concrete contraction, strengthens its cracking resistance ability.

Described nano level water-ground limestone is grain diameter magnitude is nano level heavy calcium carbonate; Nano level water-ground limestone can increase density and the splitting resistance of material, thus contributes to keeping out the corrosion of external environment to reinforcing bar.

Described concrete nanometer diminishing super instant coagulant can increase substantially early age strength of concrete, is conducive to rapid construction of salvaging.

Described accelerating component is three kinds or four kinds in magnesium sulfate, sodium sulfate, Sodium Nitrite, trolamine, Sulfothiorine, tri-isopropanolamine, calcium formiate.

Described slow setting component is the one in Sunmorl N 60S, citric acid.

Described resistance rust component is calcium nitrite, nitrocalcite, potassiumchromate or tin protochloride; Rust inhibitor can improve reinforcing bar resistance to corrosion in wet condition.

The each component of the present invention interacts and coordinates mutually, and compared with prior art, tool has the following advantages:

1. early strong fast: owing to adding by accelerating component, diminishing component, resistance rust component, slow setting component and tune

The concrete nanometer diminishing super instant coagulant that joint agent component is formed, concrete early strength is significantly improved (within 24 hours, intensity can reach more than 90% of design strength).The raising of early strength is conducive to rapid construction of salvaging, and reduces the probability that in maintenance processes, structure is corroded by external environment.

2, degree of compactness is high: nano heavy calcium carbonate can increase substantially concrete degree of compactness, is conducive to promoting salvaging quality.Meanwhile, improve the concrete degree of compactness of repairing to play an important role to preventing inner steel bar corrosion.

3, cost is low: involved material construction is cheap, is conducive to reducing construction costs.

4, easy construction: this material can be packed in bag, also can deliver to engineering truck in the batch can in building site.During use, working-yard adds a certain proportion of water within this material on request and stirs.Preparation simply, is easily constructed, and is conducive to promoting.

5, do not ftracture: the expansion of swelling agent can offset concrete contraction, effectively reduces shrinkage cracking.The high efficiency water reducing agent added and concrete nanometer diminishing super instant coagulant can reduce the consumption of coagulation water in soil, reduce water cement ratio, reduce the contraction of concrete in condensing process.

6 is good with base bonding property: drying shrinkage can not occur in condensing process, makes the concrete after repairing and basal body structure inside to produce tensile stress.Along with the passing of hydration time, repair cross section and can form fine and close enclosed construction, be conducive to structure and resist extraneous poor environment.

7, rust protection, improves structure durability: first, indehiscent surface layer and high solidity concrete can reduce chloride permeability effect, and protection inside concrete reinforcing bar, makes it have very strong erosion resistance.Secondly, owing to not shrinking phenomenon in condensing process, make there is better cohesive action between the concrete after repairing and housing construction, effectively prevent the undesirable element in external environment from damaging inside configuration.Meanwhile, the rust inhibitor in material also contributes to resisting steel bar corrosion.

Embodiment

Embodiment 1:

Raw materials used and mass percent is cement 40%, medium sand 30%, coarse aggregate 21%, high efficiency water reducing agent 0.5%, swelling agent 3%, nano level water-ground limestone 3.5%, concrete nanometer diminishing super instant coagulant 1% and rust inhibitor 1%; Raw materials used and the mass percent of described solidifying native nanometer diminishing super instant coagulant is accelerating component 52%, diminishing component 32%, resistance rust component 6%, slow setting component 4% and regulate component 6%.Above-mentioned each component is weighed by mass percentage, carries out vibration compacting by feeding sequence, stir, by corresponding technical regulation and mix-design to ensure its performance such as workability, homogeneity.

Reduce water consumption under the condition of satisfied construction mobility as far as possible.

Cement: 52.5# silicate cement;

Medium sand: fineness modulus is 2.4, particle diameter is the sand of 0.35mm;

Coarse aggregate: particle diameter is the rubble of 18 20mm;

Accelerating component: magnesium sulfate, sodium sulfate and Sodium Nitrite;

Slow setting component: Sunmorl N 60S;

High efficiency water reducing agent: naphthene sulfonic acid high efficiency water reducing agent;

Nano level water-ground limestone: grain diameter magnitude is nano level heavy calcium carbonate.

Swelling agent: sulphoaluminate expander.

Rust inhibitor: calcium nitrite.

Embodiment 2:

Raw materials used and mass percent is cement 40%, coarse aggregate 16%, medium sand 30%, high efficiency water reducing agent 1%, nano level water-ground limestone 5%, swelling agent 4%, concrete nanometer diminishing super instant coagulant 2% and rust inhibitor 2%; Raw materials used and the mass percent of described concrete nanometer diminishing super instant coagulant is accelerating component 50%, diminishing component 30%, resistance rust component 9%, slow setting component 4% and regulate component 7%.

Manufacture method is with embodiment 1.

Cement: 52.5# silicate cement;

Medium sand: fineness modulus is 2.4, particle diameter is the sand of 0.35mm;

Coarse aggregate: particle diameter is the granite of 18 22mm;

Accelerating component is trolamine, Sulfothiorine, tri-isopropanolamine and calcium formiate;

Slow setting component is citric acid;

High efficiency water reducing agent: polycarboxylate high-efficiency water-reducing agent;

Nano level water-ground limestone: grain diameter magnitude is nano level heavy calcium carbonate.

Swelling agent: ZY swelling agent.

Rust inhibitor: nitrocalcite.

The embodiment of the present invention 1,2 tested by proportioning, the 52.5 grade silicon acid salt cements that basic mechanical performance and GB175-2007 standard specify compare, and result is as shown in table 1.

Table 1

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Claims (1)

1. a nanometer ungauged regions repairing concrete, it is characterized in that being made up of cement, medium sand, coarse aggregate, high efficiency water reducing agent, swelling agent, nano level water-ground limestone, concrete nanometer diminishing super instant coagulant and rust inhibitor, the mass percent of each component is as follows: cement 35 ~ 45%, medium sand 25 ~ 42%, coarse aggregate 15 ~ 25%, high efficiency water reducing agent 0.5 ~ 1%, swelling agent 3 ~ 4%, nano level water-ground limestone 2 ~ 5%, concrete nanometer diminishing super instant coagulant 1 ~ 2%, rust inhibitor 1 ~ 2%; Each constituent mass per-cent of described concrete nanometer diminishing super instant coagulant is as follows: accelerating component 46% ~ 52%, diminishing component 26% ~ 32%, resistance rust component 6% ~ 15%, slow setting component 4% ~ 5%, nano level water-ground limestone 6% ~ 8%;

Described high efficiency water reducing agent component is the one in naphthene sulfonic acid series high-efficiency water-reducing agent, High Efficient Diswater;

Described swelling agent is the one in alumite plumping agent, U-I type swelling agent, U-II type swelling agent, U-III type swelling agent, sulphoaluminate expander, ZY swelling agent, composite expanding agent, bulking agent of calcium aluminate;

Described nano level water-ground limestone is grain diameter magnitude is nano level heavy calcium carbonate;

Described resistance rust component is the one in calcium nitrite, nitrocalcite, potassiumchromate, tin protochloride;

Described accelerating component is three kinds or four kinds in magnesium sulfate, sodium sulfate, Sodium Nitrite, trolamine, Sulfothiorine, tri-isopropanolamine, calcium formiate;

Described slow setting component is the one in Sunmorl N 60S, citric acid;

Described medium sand is fineness modulus is 2.3 ~ 3.0, and median size is the sand of 0.35 ~ 0.5mm;

At least one in the rubble of described coarse aggregate to be particle diameter be 18 ~ 22mm or granite.