CN104844035B - Interface reinforcer preparation method and application of interface reinforcer - Google Patents

Interface reinforcer preparation method and application of interface reinforcer Download PDF

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Publication number
CN104844035B
CN104844035B CN201510151334.3A CN201510151334A CN104844035B CN 104844035 B CN104844035 B CN 104844035B CN 201510151334 A CN201510151334 A CN 201510151334A CN 104844035 B CN104844035 B CN 104844035B
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interface
reinforcer
phosphate
enhancer
preparation
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CN104844035A (en
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钱觉时
秦继辉
范英儒
刘涛
陈仲明
尤超
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Maintenance Technology Co Ltd Of Gansu Highway & Bridge Construction Group
Chongqing University
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Maintenance Technology Co Ltd Of Gansu Highway & Bridge Construction Group
Chongqing University
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Abstract

The present invention discloses an interface reinforcer preparation method and application of the interface reinforcer. The preparation method comprises the following steps: firstly, reheated magnesium oxide, phosphate and a borax retarder are prepared into dry powder, wherein the preheating magnesium oxide and the phosphate are in a mass ratio of (0-4):1, and the borax retarder accounts for 3-12% of the reheated magnesium oxide in mass; coal ash powder which accounts for 0-20% of the dry powder in mass is doped for preparation and uniform agitation; then water 9-25% of all the raw materials in mass is added and quickly agitated for 3-5 min so as to obtain the interface reinforcer. The interface loosening part of an old substrate is cleaned and kept dry and dust is cleared in specific application; the interface reinforcer is uniformly coated or sprayed on the interface of the old substrate till the whole interface is soaked; finally, magnesium phosphate cement concrete is poured and tightly pounded before the interface reinforcer is coagulated and dried. The method achieves remarkable improvement on the adhesion performance of the magnesium phosphate cement concrete through the preparation and use of the interface reinforcer, the material cost is remarkably lowered, and the method has a good market prospect.

Description

A kind of preparation method and applications of Interface enhancer
Technical field
The invention belongs to the technical field of magnesium phosphate cement, is related to a kind of preparation method and applications of Interface enhancer, The preparation method of specifically related to a kind of Interface enhancer and its bond magnesium phosphate cement concrete and Deteriorated concrete pavement is improved Application in intensity.
Background technology
Magnesium phosphate cement is generally formulated according to a certain percentage by dead burned magnesia and phosphate, slow setting component, is had Soon firmly, early by force the features such as, shrinking little, is very suitable for concrete road surface and the isostructural Rapid-Repair of industrial premises.But due to In magnesium phosphate cement, the market price of key component costly, causes the cost for preparing magnesium phosphate cement also than ordinary cement High several times even ten several times, thus greatly limit the extensive application of magnesium phosphate cement.In order to effectively reduce material unit cost With the overall performance for improving material, people often tend to it is lower-cost gather materials, mineral admixture replaces most phosphorus Sour magnesium cement powder preparing mending mortar or concrete, now in order to ensure the workability of patching material, also can by its water consumption It is corresponding to improve.Generally, different from ordinary cement, the magnesium phosphate cement slurry of excellent performance is a class low water binder ratio system, its energy The collection doses of effectively parcel will be lacked compared with ordinary cement slurry.Therefore, increase to gather materials consumption and improve water consumption and be likely to phosphorus The various aspects of performance of sour magnesium cement concrete patching material is adversely affected, and can especially weaken and damaged concrete is repaired to pass Important interfacial bond property.Usually, when interfacial adhesion is more weak, the destruction and failure of repaired xoncrete structure Phenomenon is frequently experienced on new-old concrete interface.Existing research and application show, the boundary of magnesium phosphate cement and old concrete Face bonding is gathered materials and Binder Materials mass ratio(a/b)And water-cement ratio(w/b)Affect notable etc. factor.Under the same conditions, a/b =0.5 6 h adhesion strengths of mortar are up to 3.5 more than MPa, and 6 h cementations of the mortar of a/b=1.5 and concrete substrate Very weak, intensity is less than 1 MPa;And for example during w/b=0.10,1 d of magnesium phosphate cement and 28 d adhesion strengths are respectively up to 6 Mpa With 10 more than MPa, and when water-cement ratio is improved to 0.18, all kinds of mechanical properties of hardened paste decline in various degree, especially with The reduction of interface binding intensity is the most obvious, and 1 d of slurry and 28 d adhesion strengths decrease beyond 70%.Work as magnesium phosphate cement It is when concrete is used to repair, if which is relatively low with the adhesion strength of old concrete, inevitable it is difficult to ensure that repairing quality.
In actual Rapid-Repair, it is on active service to engineering again, most basic requirement is, the comprcssive strength of patching material 30 more than MPa, bending resistance adhesion strength can be reached more than 3.0 MPa.For the repairing of small area, starched using magnesium phosphate cement only Or the mortar that sand using amount is less, above-mentioned repairing can be easily met by the proportioning of regulation magnesium phosphate cement patching material now It is multiple to require.And the repairing of larger area would generally consider concrete batching, as unit volume entoplasm body relative amount is reduced, lead The slurry amount of new-old concrete near interface is caused also to be short of relatively, it is impossible to ensure that slurry fully infiltrates old basal body interface, so as to pole The early stage adhesive property of earth effect patching material;In concrete, slurry water-cement ratio is generally large simultaneously, so also seriously can cut Weak mending concrete cementitiousness.In this case, when carrying out generous amount repairing using magnesium phosphate cement concrete, it is more likely that deposit At interface, the development of early stage adhesion strength is slow and later stage adhesion strength is not high and then the risk for repairing failure occurs.It is new and old mixed to improve The interfacial bond property of soil is coagulated, the bonding that can to a certain degree improve new-old concrete by the roughness for increasing basal body interface is made With, but improvement is not very obvious;The interfacial adhesion of new-old concrete can also be improved to interface plant anchor process, but operated Journey slightly shows complexity.
The most prominent advantage of magnesium phosphate cement is quickly to form intensity after the completion of construction, and later stage mechanical property is better than old Matrix.Prior art measure can ensure that magnesium phosphate cement system merely meets repairing work to its workability or bonding The requirement of the performances such as intensity.But on the basis of material cost is reduced as far as possible, how to make to gather materials consumption and water-cement ratio it is larger The requirement of adhesion strength when magnesium phosphate cement concrete meets reparation quick to Deteriorated concrete pavement, does not also occur correlation at present Simply effective technical method and approach.
The content of the invention
For deficiencies of the prior art, it is an object of the invention to provide a kind of preparation side of Interface enhancer Method.
It is a further object of the present invention to provide the application of above-mentioned Interface enhancer, improves using phosphate Interface enhancer Magnesium phosphate cement concrete and the adhesive property of Deteriorated concrete pavement, realize that early stage adhesion strength quickly can be formed, the later stage bonds Intensity is higher, the risk of bonding failure occurs because being on active service too early so as to reduce repairing work.
For achieving the above object, the present invention is adopted the following technical scheme that:The previously prepared raising magnesium phosphate cement that is beneficial to is mixed The magnesium phosphate cement slurry or hot saturation phosphate solution of solidifying soil cementation, as Interface enhancer;By old concrete matrix Interface clean up and keep drying, then quick to brush or spray a bed boundary reinforcing agent, brushing completes after-pouring phosphoric acid Magnesium cement concrete, makes interface form closely knit transition region.
Specifically, a kind of preparation method of Interface enhancer, comprises the steps:
1)Dry powder is made into by dead burned magnesia, phosphate and Borax retarder;Wherein, dead burned magnesia and phosphatic matter Amount is than being 0 ~ 4:1;Borax retarder accounts for the 3 ~ 12% of dead burned magnesia quality;The dead burned magnesia is magnesite at 1800 DEG C During calcining, carbon dioxide is escaped completely, and magnesium oxide forms periclase compact block, claims dead burnt magnesite;
2)The flyash for mixing above-mentioned dry powder gross mass 0 ~ 20% carries out dispensing, and mixes;
3)The water of above-mentioned all raw material gross masses 9 ~ 25% is added, 3 ~ 5 min is quickly stirred, is obtained Interface enhancer.
In the preparation method of Interface enhancer, the phosphate includes ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate In one or more compound, adopt ammonium dihydrogen phosphate as preferably phosphate, the material cost is relatively low, gained slurry stream Dynamic property is good, intensity is high;When obtained Interface enhancer is slurry, phosphate needs Jing levigate and crosses 60 ~ 180 mesh sieves, using mill Thin phosphate causes Interface enhancer effect of impregnation more preferably;When dead burned magnesia addition is 0, obtained Interface enhancer is Liquid, mixing water need to be previously heated to 65 ~ 100 DEG C, and now phosphate can be dissolved in the water in a large number, and its saturation solubility is notable Increase, can provide enough phosphate components for being beneficial to interfacial adhesion.
Above-mentioned Interface enhancer is improving magnesium phosphate cement concrete and the application in Deteriorated concrete pavement adhesion strength, tool Body comprises the steps:
1)The cleaning of old matrix:The interface of old matrix is loosened into position with steel brush, hairbrush or the aspiration of negative pressure machine and dust is clear Sweep clean, and keep drying;
2)The coating or spraying of Interface enhancer:To be evenly coated with using Interface enhancer obtained in above-mentioned preparation method Or be sprayed on the old basal body interface for cleaning up, until interface is all infiltrated;
3)Pour:Before Interface enhancer condenses, is dried, magnesium phosphate cement concrete is poured and consolidates.
The coating or spraying are to be smeared using brush or sprayer spraying, and the brushing thickness of slurry is 1 ~ 5 mm, liquid Spraying effect have just open fire for interface;The step improves the slurry amount of interface, provides for new Deteriorated concrete pavement close Real interfacial transition zone so that interface is fuller, physically or chemically cementation it is higher;Wherein, hot saturation phosphate solution Should not excessively smear, can otherwise dramatically increase interface water content, it is more harm than good.
Compared to existing technology, the present invention has the advantages that:
1st, the inventive method is by adhesive property excellent magnesium phosphate cement slurry or rich in the phosphoric acid beneficial to interfacial adhesion The hot saturation phosphate solution of salt component is used as Interface enhancer, is coated uniformly on old matrix surface, on the one hand in for boundary Slurry is supplemented at face and effect of impregnation is improved, another aspect phosphate increases and is conducive to new Deteriorated concrete pavement to form strong physics Or chemical bonding effect, so as to improve the interface binding intensity of new Deteriorated concrete pavement.
2nd, the inventive method is compared with corresponding pedestal method, the use gathered materials with water in magnesium phosphate cement concrete is adjusted While amount, with reference to coating Interface enhancer, the early stage adhesion strength at new Deteriorated concrete pavement interface is improve, and to pressure resistance Degree has no adverse effect, and meets the requirement of quick reparation, realizes the quick reparation of engineering.
3rd, the raw material sources that the present invention is used are extensively, cheap, and method is simple to operate, it is easy to accomplish;It is fast meeting Speed is repaired while requirement, is made material cost at least reduce 25%, has been saved great amount of cost, before good marketing Scape.
Specific embodiment
In order to verify the test effect of the present invention, applicant carried out specific embodiment, demonstrates the beneficial effect of the present invention Really, during checking, 7 groups of test specimens are prepared respectively using the method for the present invention and pedestal method, each proportioning raw materials of 7 groups of test specimens are as follows Shown in table 1;In embodiment if no special instructions, the raw material of employing is ordinary commercial products.
The test of table 1 match ratio collects
For 1#, 2# and 3# test specimen, prepared using the method for benchmark, i.e. 1# test specimens adopt magnesium phosphate cement mortar, 2# and 3# test specimens adopt magnesium phosphate cement concrete, and before patching material is poured, the basal body interface of 1# and 2# test specimens is not brushed any Component, the basal body interface of 3# test specimens apply swabbing, and building body age to be poured reaches form removal after 4 h, and test 6 h of test specimen, 1 d, 7 d With the anti-folded knotting strength and comprcssive strength of 28 d.
For 4#, 5#, 6# and 7# test specimen, prepared using the method for the present invention, previously prepared Interface enhancer, in magnesium phosphate Before cement concrete is poured, Interface enhancer well prepared in advance is coated on basal body interface;That is the matrix surface of 4# test specimens 75 DEG C of hot saturation ammonium dihydrogen phosphate is brushed, the matrix surface of 5#, 6# and 7# test specimen is brushed respectively with different ratio group Into magnesium phosphate cement slurry, building body age to be poured reaches form removal after 4 h, and tests 6 h, 1 d, 7 d and 28 d of test specimen Adhesive bending strength and comprcssive strength.
1 contrast test of embodiment:
1)Dead burned magnesia, ammonium dihydrogen phosphate and Borax are configured to into magnesium phosphate cement;Wherein, dead burned magnesia and phosphoric acid The mass ratio 4 of ammonium dihydrogen:1st, Borax accounts for the 8% of dead burned magnesia quality;It is incorporated as the middle sand of 1 times of cement quality, mix homogeneously, And pour water for cement quality 13% again into, 4 min are stirred, magnesium phosphate cement mortar is obtained;
2)Magnesium phosphate cement mortar is poured in the die trial for placing old matrix, vibration compacting obtains test specimen 1#.
Described step 2)In, three gang mould of steel when pouring using 40mm*40mm*160mm has, and old matrix is 360 d The mortar specimen of age, and cleaved machine is cut in half, old basal body interface as cuts formed section;Subsequent embodiment 2 ~ The source of the old matrix used by 7 is consistent with the step.
2 contrast test of embodiment:
1)Dead burned magnesia, ammonium dihydrogen phosphate and Borax are configured to into magnesium phosphate cement;Wherein, dead burned magnesia and phosphoric acid The mass ratio 4 of ammonium dihydrogen:1st, Borax accounts for the 8% of dead burned magnesia quality;It is incorporated as gathering materials for 2 times of cement quality, mix homogeneously; Pour the water for cement quality 16% again into, stir 4 min, magnesium phosphate cement concrete is obtained;Coagulation used by subsequent embodiment 3 ~ 7 The proportioning composition of soil is consistent with prepared by the embodiment;
2)By step 1)The magnesium phosphate cement concreting for preparing enters in the die trial for placing old matrix, vibrates close It is real, obtain test specimen 2#;
Described step 1)In, gather materials for middle sand and particle diameter for the handstone of 5 ~ 10 mm compositionss;Wherein, middle sand and The mass ratio of handstone is 1:1;The proportion of composing that gathers materials in subsequent embodiment 3 ~ 7 gathers materials consistent with the embodiment.
3 contrast test of embodiment:
1)One layer of water is sprayed on old basal body interface, spraying degree has open fire just for interface;
2)Dead burned magnesia, ammonium dihydrogen phosphate and Borax are configured to into magnesium phosphate cement;Wherein, dead burned magnesia and phosphoric acid The mass ratio 4 of ammonium dihydrogen:1st, Borax accounts for the 8% of dead burned magnesia quality;It is incorporated as gathering materials for 2 times of cement quality, mix homogeneously; Pour the water of cement quality 16% again into, stir 4 min, magnesium phosphate cement concrete is obtained.
3)Before the water of spraying is dried, the magnesium phosphate cement concreting for preparing is entered the examination for placing old matrix In mould, vibration compacting obtains test specimen 3#.
A kind of preparation method and applications of 4 Interface enhancer of embodiment:
1)Heat water to 75 DEG C and be persistently incubated, add the ammonium dihydrogen phosphate of 5 times of water quality, stir 3 min, boundary is obtained Face reinforcing agent;
2)One layer of step 1 is brushed rapidly on the old basal body interface with hairbrush) obtained by Interface enhancer, brushing degree is Interface has open fire just;
3)Before Interface enhancer is dried, magnesium phosphate cement concreting is quickly entered the die trial for placing old matrix Interior, vibration compacting obtains test specimen 4#.
A kind of preparation method and applications of 5 Interface enhancer of embodiment:
1)By dead burned magnesia, levigate ammonium dihydrogen phosphate and Borax mix homogeneously, preparation obtains Binder Materials;Wherein, weight Burned magnesium oxide and levigate ammonium dihydrogen phosphate mass ratio 2:1, Borax accounts for the 6% of dead burned magnesia quality;Add above-mentioned Binder Materials The water of gross mass 11% quickly stirs 4 min, and Interface enhancer is obtained;The levigate ammonium dihydrogen phosphate refers to ammonium dihydrogen phosphate Jing Cross levigate and cross 180 mesh sieves;
2)One layer of step 1 is brushed on old basal body interface with hairbrush rapidly)Obtained Interface enhancer, brushing thickness 1 ~ 2mm。
3)Before Interface enhancer condenses, magnesium phosphate cement concreting is quickly entered the die trial for placing old matrix Interior, vibration compacting obtains test specimen 5#.
A kind of preparation method and applications of 6 Interface enhancer of embodiment:
1)By dead burned magnesia, levigate ammonium dihydrogen phosphate and Borax mix homogeneously, preparation obtains dry powder;Wherein, reheating oxygen Change the mass ratio 2 of magnesium and levigate ammonium dihydrogen phosphate:1, Borax accounts for the 6% of dead burned magnesia quality;Above-mentioned dry powder gross mass is mixed again 10% flyash, mix homogeneously obtains Binder Materials;The water of Binder Materials gross mass 11% is added quickly to stir 4 min, system Obtain Interface enhancer;The levigate ammonium dihydrogen phosphate refers to ammonium dihydrogen phosphate through levigate and 100 mesh sieves excessively;The fine coal ashes End is relatively thin, and interface can be made more closely knit, is beneficial to improve the adhesion strength at interface;
2)One layer of step 1 is brushed on old basal body interface with hairbrush rapidly)Obtained Interface enhancer, brushing thickness 1 ~ 2mm。
3)Before Interface enhancer condenses, magnesium phosphate cement concreting is quickly entered the die trial for placing old matrix Interior, vibration compacting obtains test specimen 6#.
A kind of preparation method and applications of 7 Interface enhancer of embodiment:
1)By dead burned magnesia, levigate ammonium dihydrogen phosphate and Borax mix homogeneously, preparation obtains Binder Materials;Wherein, weight Burned magnesium oxide and levigate ammonium dihydrogen phosphate mass ratio 4:1, Borax accounts for the 8% of dead burned magnesia quality;Add above-mentioned Binder Materials The water of gross mass 12% quickly stirs 4 min, and Interface enhancer is obtained;The levigate ammonium dihydrogen phosphate refers to ammonium dihydrogen phosphate Jing Cross levigate and cross 60 mesh sieves;
2)One layer of step 1 is brushed on old basal body interface with hairbrush rapidly)Obtained Interface enhancer, brushing thickness 1 ~ 2mm。
3)Before Interface enhancer condenses, magnesium phosphate cement concreting is quickly entered the die trial for placing old matrix Interior, vibration compacting obtains test specimen 7#.
Embodiment 8:Experimental result:
The interfacial adhesion effect of novel concrete and old matrix can be affected in view of form removal eraly, therefore select form removal after 4 h, The intensity after 6 h, 1d, 7d and 28d is determined respectively.Pour the interfacial adhesion rupture strength and comprcssive strength of building body according to《Cement is strong The degree method of inspection》(GB/T 17671-1999) is measured, and test result is as shown in table 2.
The impact of 2 the inventive method of table and pedestal method to magnesium phosphate cement patching material intensity and cost
Can be seen that for 1# and 2#, 3# test specimen from table 1 and 2, using conventional method, when sand consumption is less, phosphoric acid Magnesium cement mortar and the early stage adhesion strength of old matrix, the early anti pressured intension for pouring building body are higher, fully meet Rapid-Repair The requirement of engineering, but the now cost highest of material;After 1 times of consumption increase of gathering materials, water-cement ratio are properly increased, unit bodies Gel material content in product is accordingly reduced, and now material resulting cost can reduce about 32%, but also bring negative effect, also I.e. magnesium phosphate cement concrete is remarkably decreased with the early strength of old matrix, particularly evident with interface binding intensity;And in matrix One layer of water is sprayed on interface can reduce the water-cement ratio of interface slurry, more be unprofitable to the development of adhesion strength;Compare 1# test specimens, 2# 6 h adhesion strengths of test specimen and comprcssive strength decline 84.9% and 37.5% respectively, with development of age to 1 d, although pour building body Comprcssive strength can rise to suitable scope, but interface binding intensity remains unchanged very low, and this obviously cannot meet repairing work Quick military service.
For 4#, 5#, 6# and 7# test specimen, using the method for the present invention, previously prepared Interface enhancer, then in good time by which It is coated on old basal body interface, compares 1# test specimens, 5#, 6# and 7# test specimen properly increases gathering materials in magnesium phosphate cement concrete Consumption and water-cement ratio, now material into instinct reduce more than 25%, though 6h and 1d interface binding intensities and comprcssive strength have necessarily Degree declines, but still can meet the requirement of quick fix engineering, and after 7d adhesion strength is closely;But compare 2# and 3# examinations Part, in good time the early stage of 4#, 5#, 6# and 7# test specimen of coating Interface enhancer and later stage interfacial bond property be improved significantly. Therefore, the use of Interface enhancer, the interfacial bond property that can be effectively improved between magnesium phosphate cement concrete and old matrix will not The entire compression intensity of building body is poured in impact.
In sum, the factors such as consumption, water-cement ratio, dead burned magnesia and phosphatic ratio of gathering materials are mixed to magnesium phosphate cement Coagulate the performances such as the interface binding intensity of soil and suffer from important impact;Interface slurry amount is fuller, water content is lower, high phosphorus Phosphate content is conducive to magnesium phosphate cement patching material to form good bonding interface with old matrix.The present invention is being unlikely to aobvious Write on the basis of affecting patching material early strength and ensureing workability, to a certain degree reduce being configured to for such patching material This, then by Interface enhancer being prepared and coating improving the adhesive property between novel concrete and old matrix, realize the fast of engineering Speed is repaired.
Finally illustrate, above example is only unrestricted to illustrate technical scheme, although with reference to compared with Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, which all should be covered at this In the middle of the right of invention.

Claims (2)

1. a kind of application of Interface enhancer, it is characterised in that glue with Deteriorated concrete pavement magnesium phosphate cement concrete is improved Application on knotting strength;Specifically include following steps:
1)The cleaning of old matrix:The interface of old matrix is loosened into position with steel brush, hairbrush or the aspiration of negative pressure machine and dust cleaning is done Only, and keep drying;
2)The coating of Interface enhancer:Interface enhancer is uniformly coated on the old basal body interface for cleaning up, until handle Interface all infiltrates;
Described Interface enhancer is prepared using following steps:
(1)Dry powder is made into by dead burned magnesia, phosphate and Borax retarder;Wherein, dead burned magnesia and phosphatic quality Than for 2 ~ 4:1;Borax retarder accounts for the 3 ~ 12% of dead burned magnesia quality;Obtained Interface enhancer is slurry, in preparation process The phosphate for being added needs Jing levigate, and crosses 60 ~ 180 mesh sieves;The phosphate includes ammonium dihydrogen phosphate, potassium dihydrogen phosphate and phosphorus One or more in acid dihydride sodium it is compound;
(2)The flyash for mixing above-mentioned dry powder gross mass 0 ~ 20% carries out dispensing, and mixes;
(3)The water of above-mentioned all raw material gross masses 9 ~ 12% is added, 3 ~ 5 min is quickly stirred, is obtained Interface enhancer;
3)Pour:Before Interface enhancer condenses, is dried, magnesium phosphate cement concrete is poured and consolidates.
2. the application of Interface enhancer according to claim 1, it is characterised in that the brushing thickness of slurry is 1 ~ 5 mm.
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CN107021728B (en) * 2017-05-31 2019-08-09 广州长宜新材料科技有限公司 A kind of inorganic cement base quick anchoring adhesive and preparation method thereof
CN110451832A (en) * 2019-08-08 2019-11-15 广州市泰宇科技发展有限公司 A kind of phosphorus magnesium anchor adhesive and preparation method thereof
CN111533574A (en) * 2020-05-25 2020-08-14 山东天意机械股份有限公司 Surface protection treatment method for foamed concrete product
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CN115650693B (en) * 2022-02-11 2023-07-21 云南省建筑科学研究院有限公司 Magnesium phosphate repair mortar based on monoammonium phosphate and machine-made sand and preparation method thereof
CN115142053B (en) * 2022-07-26 2023-08-22 重庆大学 Surface treatment method for steel bridge deck or steel structural member
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