CN104987009A - Nanometer non-shrinkage mortar - Google Patents

Abstract

The invention discloses nanometer non-shrinkage mortar 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 mortar comprises, by mass, 35%-45% of cement, 45%-55% of medium sand, 0.5%-1.0% of high-efficiency slushing agent, 5-10% 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 non-shrink mortar

Technical field

The present invention relates to a kind of repairing sand-cement slurry, 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 non-shrink mortar of rust protection, be mainly used in the rapid rush-repair construction of the concrete works such as road, bridge.

Background technology

Sand-cement slurry refers to makes gelling material with cement, does to gather materials, coordinates by a certain percentage with water (can contain admixture and adulterant), form, can be widely used in civil engineering work through stirring with sand.Early the feature of strength mortar is easy construction, duration is short, be mainly used in studying for a second time courses one has flunked fast the construction of construction speed will be sought quickness and life requirement is high rapid rush-repair, concrete, reinforcing engineering, as the quick grouting of the repairing grouting of highway bridge connecting sewing, high-speed rail bridge bearing, the grouting of post-tensioned concrete structure reserving hole channel and sealing off and covering anchorage, equipment is installed time base mortar etc.Usual morning is all added with hardening accelerator in strength mortar, and the patent of invention of Chinese Patent Application No. 03113391.6 discloses one " high-strength anchor grouting agent ", is formed by silicate cement, swelling agent, early strength water-reducing agent and binding agent mixed preparing.The patent of invention of China Patent No. 201110324054.X discloses one " High anti bending cement grouting material ", is formulated by gelling material, gypsum, mineral fibre, water reducer, thickening material, plasticity-retention agent and fine aggregate.Although both all have early strong characteristic, but the contraction had in condensing process in various degree, not only can cause repairing surface layer cracking, but also can depart from repairing matrix, described two kinds of phenomenons not only affect visual appearance but also can cause steel bar corrosion, affect the weather resistance of structure.Existing mortar also also exists the low problem of degree of compactness simultaneously, also easily causes the corrosion of repairing part interior reinforcing bar, thus more affects the weather resistance of structure.

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 non-shrink mortar of rust protection.

Technical solution of the present invention is: a kind of nanometer non-shrink mortar, it is characterized in that being made up of cement, medium sand, 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 45 ~ 55%, high efficiency water reducing agent 0.5 ~ 1.0%, swelling agent 5 ~ 10%, 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 cement is ordinary portland cement, is preferably 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 rust inhibitor 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, the early strength of mortar 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 the degree of compactness of mortar, is conducive to promoting salvaging quality.Meanwhile, the degree of compactness improving repairing mortar plays 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 the contraction of mortar, effectively reduces shrinkage cracking.The high efficiency water reducing agent added and concrete nanometer diminishing super instant coagulant can reduce the consumption of water in mortar, reduce water cement ratio, reduce the contraction of mortar in condensing process.

6, good with base bonding property: drying shrinkage can not occur in condensing process, make the mortar face 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 mortar 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 cross section 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 be cement 40%, medium sand 45%, high efficiency water reducing agent 1.0%, swelling agent 9%, nano level water-ground limestone 2%, concrete nanometer diminishing super instant coagulant 2% 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%.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;

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 43%, medium sand 46%, high efficiency water reducing agent 0.5%, nano level water-ground limestone 2%, swelling agent 5.5%, concrete nanometer diminishing super instant coagulant 1% 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 2.6, particle diameter is the sand of 0.4mm;

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 non-shrink mortar, it is characterized in that being made up of cement, medium sand, 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 45 ~ 55%, high efficiency water reducing agent 0.5 ~ 1.0%, swelling agent 5 ~ 10%, 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.