CN110156402A - A kind of cement base new-old concrete interfacial adhesion strengthening material and preparation method - Google Patents

A kind of cement base new-old concrete interfacial adhesion strengthening material and preparation method Download PDF

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Publication number
CN110156402A
CN110156402A CN201910480767.1A CN201910480767A CN110156402A CN 110156402 A CN110156402 A CN 110156402A CN 201910480767 A CN201910480767 A CN 201910480767A CN 110156402 A CN110156402 A CN 110156402A
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CN
China
Prior art keywords
water
interfacial adhesion
old concrete
cement base
strengthening material
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Pending
Application number
CN201910480767.1A
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Chinese (zh)
Inventor
华渊
张聪
连俊英
韩世诚
刘文化
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Jiangnan University
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Jiangnan University
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Priority to CN201910480767.1A priority Critical patent/CN110156402A/en
Publication of CN110156402A publication Critical patent/CN110156402A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00637—Uses not provided for elsewhere in C04B2111/00 as glue or binder for uniting building or structural materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a kind of cement base new-old concrete interfacial adhesion strengthening material and preparation method thereof, this material is by portland cement, polycarboxylate high performance dehydragent, silicon ash, I grades of flyash, micro-expanding agent, river sand and water is agitated is made.It is primarily characterized in that initial flow degree is big, bleeding, adhesion strength be not high under pressure effect, excellent tensile strength and compression strength and stabilization, slurry self-stability is good, penetrating power is strong, raw material sources are abundant, preparation process is simpler, it is mainly used for being especially enlarging section area in reinforced concrete structure reinforcing process and needing to improve the structural fortification of novel concrete Yu original Concrete Bond Strength, it is also possible to make the grouting material of post-tensioning prestressed steel concrete.

Description

A kind of cement base new-old concrete interfacial adhesion strengthening material and preparation method
Technical field
The present invention relates to building material technical fields, strengthen more particularly to a kind of cement base new-old concrete interfacial adhesion Material and preparation method thereof.
Background technique
Industry and two lining concrete knots in reinforced beam, column, plate or the Tunnel Engineering in Civil structure The existing structures such as cushion cap, pier stud, bent cap, spandrel girder in structure or science of bridge building such as should design, construct, using at the reasons, occur Deficient strong, bearing capacity deficiency, the lower generation cracking of overload effect or even breakage etc. are a kind of normalities, when these phenomenons are less serious When, reinforcement is generally carried out using structural strengthening, such as the area of enlarging section, this stylish cladding concrete is viscous with existing concrete Knot performance is to restrict the key factor of consolidation effect；In addition, to post-tensioning prestressed steel concrete, in steel strand wires or high-strength steel After muscle tensioning, first is that the protection to them requires second is that stretching force is passed to reinforced concrete structure through mud jacking Mode is realized.Currently used binding material, press mortar high-molecular organic material or inorganic non-metallic material, Middle cement-based material is most important interface adhesive material or grouting material, their common feature is: preparation is relatively simple, material comes Source is relatively wide, compression strength less stable, is relatively also easy to produce that bleeding, high-molecular organic material be more oxidizable under pressure and embrittlement Cracking, early strength develop relatively slow, relative cost is higher etc..
Summary of the invention
It is strong it is an object of the invention in view of the drawbacks of the prior art, provide a kind of cement base new-old concrete interfacial adhesion Change material and preparation method thereof.
The present invention to achieve the above object, adopts the following technical scheme that a kind of cement base new-old concrete interfacial adhesion is strong Change material, is made of portland cement, water-reducing agent, silicon ash, flyash, micro-expanding agent, river sand and water, the weight of each raw material component Proportion are as follows: portland cement 620-640Kg/m3, silicon ash 34-50Kg/m3, flyash 37-64Kg/m3, water-reducing agent 35-45Kg/ m3, micro-expanding agent 80-120Kg/m3, river sand 1150-1250Kg/m3, water 270-280Kg/m3。
Further, the portland cement is P. II, and strength grade is not less than 42.5MPa, dicalcium silicate and silicic acid The total content of tricalcium is not less than 70%, and the content of tricalcium aluminate is not higher than 8%, remaining technical indicator meets existing national standards to silicon The requirement of acid salt cement.
Further, the water-reducing agent is polycarboxylate high performance dehydragent, and water-reducing rate is not less than 25%.
Further, the silicon ash is that byproduct obtained by refining silicon steel is process through levigate, specific surface area > 20m2/ G, main chemical compositions SiO2(>92%)、Al2O3+Fe2O3(1.5% or so), CaO+MgO (1.5% or so) etc., pH value are 6 left The right side, it is nontoxic.
Further, the flyash is I grades of flyash, main chemical compositions SiO2(60% or so), Al2O3(21% Left and right), Fe2O3(7.0% or so), CaO+MgO (3.5% or so), loss on ignition < 3.5%, apparent density 2.3 or so.
Further, the micro-expanding agent is early-strength micro-expanding agent.
Further, the river sand is the clean river sand through washing, fineness modulus 2.6-2.9.
A kind of preparation method of the cement base new-old concrete interfacial adhesion strengthening material, comprising the following steps:
(1) silicon ash, portland cement, flyash, river sand, micro-expanding agent are subjected to premixing and are bonded to uniform state, obtain even mixing One；
(2) water-reducing agent, water are stirred evenly in high-speed mixer, obtains even mixing two；
(3) even mixing two is added into even mixing one to stir evenly and both obtains cement base new-old concrete interfacial adhesion Rankine Material.
The present invention mixes silicon ash by bonding in strengthening material in new-to-old concrete interface, and cement and flyash can be filled The hole of intergranular improves the density of bonding strengthening material, improves the volume stability of slurry under pressure, eliminates pressure and secretes The defect of water improves the early strength of bonding strengthening material；Powder is mixed by bonding in strengthening material in new-to-old concrete interface Coal ash can improve and optimize the mobility that bonding strengthens slurry material, hard through the bonding strengthening material condensation of secondary hydration improved effect Pore structure after change improves the later strength of bonding strengthening material；Added by being bonded in strengthening material in new-to-old concrete interface Enter high-performance polycarboxylate dehydragent, the mixing water amount of bonding strengthening material unit volume can be reduced and improves bonding Rankine Expect the microstructure after condensation hardening, improve the mobility that bonding strengthens slurry material, the early stage for improving bonding strengthening material is strong Degree and later strength；Appropriate clean river sand is added in strengthening material by bonding in new-to-old concrete interface, it is strong that bonding can be improved Change material in the volume stability of the states such as flow regime and condensation hardening, reduces and shrink.Silicon ash, flyash and polycarboxylate Collective effect after the addition of high-performance water reducing agent improves the cementitiousness of bonding strengthening material and old concrete, can be improved Tensile splitting strength and two-sided shearing strength.By adjusting the incorporation of polycarboxylate high performance dehydragent, different works can be met Requirement of the condition to bonding strengthening material or grouting material.
Compared with prior art, what the present invention had has the beneficial effect that cement base new-old concrete interface of the invention is viscous Knot strengthening material is characterized mainly in that initial flow degree is big, bleeding, adhesion strength be not high under pressure effect, tensile strength and resistance to compression Good strength and stabilization, slurry self-stability be good, penetrating power is strong, microdilatancy is not shunk, protect muscle ability by force, early anti pressured intension Height, later period compression strength steady growth, the features such as two-sided cutting intensity and tensile splitting strength is high, and raw material sources are rich Richness, preparation process is simpler, is mainly used for being especially enlarging section area in reinforced concrete structure reinforcing process and needing to mention The structural fortification of high novel concrete and original Concrete Bond Strength, it is also possible to make post-tensioning prestressed steel concrete Grouting material.
Specific embodiment
The present invention is described further combined with specific embodiments below, but the present invention is not limited to implement in detail below Example.
Embodiment 1: a kind of cement base new-old concrete interfacial adhesion strengthening material, by portland cement, water-reducing agent, silicon Ash, flyash, micro-expanding agent, river sand and water composition, the weight proportion of each raw material component are as follows: portland cement 630Kg/m3, silicon Grey 40Kg/m3, flyash 50Kg/m3, water-reducing agent 40Kg/m3, micro-expanding agent 100Kg/m3, river sand 1200Kg/m3, water 275Kg/ m3。
Embodiment 2: a kind of cement base new-old concrete interfacial adhesion strengthening material, by portland cement, water-reducing agent, silicon Ash, flyash, micro-expanding agent, river sand and water composition, the weight proportion of each raw material component are as follows: portland cement 620Kg/m3, silicon Grey 34Kg/m3, flyash 37Kg/m3, water-reducing agent 35Kg/m3, micro-expanding agent 80Kg/m3, river sand 1250Kg/m3, water 270Kg/m3。
Embodiment 3: a kind of cement base new-old concrete interfacial adhesion strengthening material, by portland cement, water-reducing agent, silicon Ash, flyash, micro-expanding agent, river sand and water composition, the weight proportion of each raw material component are as follows: portland cement 640Kg/m3, silicon Grey 50Kg/m3, flyash 64Kg/m3, water-reducing agent 45Kg/m3, micro-expanding agent 120Kg/m3, river sand 1150Kg/m3, water 280Kg/ m3。
Embodiment 4: a kind of cement base new-old concrete interfacial adhesion strengthening material, by portland cement, water-reducing agent, silicon Ash, flyash, micro-expanding agent, river sand and water composition, the weight proportion of each raw material component are as follows: portland cement 625Kg/m3, silicon Grey 45Kg/m3, flyash 45Kg/m3, water-reducing agent 42Kg/m3, micro-expanding agent 90Kg/m3, river sand 1220Kg/m3, water 278Kg/m3。
Portland cement described in above-described embodiment is II type of P., and strength grade is not less than 42.5MPa, dicalcium silicate and silicon The total content of sour tricalcium is not less than 70%, and the content of tricalcium aluminate is not more than 8%；The high-performance water reducing agent is polycarboxylate diminishing Agent, water-reducing rate are not less than 25%；Silicon ash is that byproduct obtained by refining silicon steel is process through levigate, specific surface area > 20m2/ g, it is main Wanting chemical component is SiO2(>92%)、Al2O3+Fe2O3(1.5% or so), CaO+MgO (1.5% or so) etc., pH value are 6 or so, nothing Poison；Flyash is I grades of flyash, main chemical compositions SiO2(60% or so), Al2O3(21% or so), Fe2O3(7.0% is left It is right), CaO+MgO (3.5% or so), loss on ignition < 3.5%, apparent density 2.3 or so；Micro-expanding agent is early-strength；River sand is through water The clean river sand washed, fineness modulus 2.6-2.9；Water is the application water of tap water or cleaning.
A kind of preparation method of cement base new-old concrete interfacial adhesion strengthening material, comprising the following steps: by the silicon Ash, portland cement, flyash, river sand, micro-expanding agent progress premixing are bonded to uniform state and obtain even mixing one；The polycarboxylic acids Salt high-performance water reducing agent, water are stirred until homogeneous state in high-speed mixer and obtain even mixing two, will obtain even mixing one and obtain It is uniformly mixed to even mixing two and obtains interfacial adhesion strengthening material of the invention, the flowing after measuring initial flow degree and 30min Degree.
Mix forms three-point bending resistance test specimen using mechanical formation processes in tri- joint-trial mould of 40mm × 40mm × 160mm, Compression strength test is formed in 70.7mm × 70.7mm × 70.7mm cube die trial, demoulding moves into standard curing box after 1d Maintenance.
1 gained cement base new-old concrete interfacial adhesion strengthening material of embodiment after measured, initial flow degree be 330 ± Fluidity after 5mm, 30min is 320 ± 5mm, and the feeding three-point bending resistance intensity of 1d, 28d mark is respectively 6.0MPa, 14.0MPa, The feeding compression strength of 1d, 28d mark is respectively 25.0MPa, 80.0MPa.
Use the resulting bonding strengthening material of the embodiment of the present invention 1, maturing has been respectively for 50% (volume ratio) 100mm × 100mm × 100mm cube specimen, 1d, 28d cleavage strength are respectively 1.90MPa, 4.85MPa.
Using the resulting bonding strengthening material of the embodiment of the present invention 1, maturing is respectively 1/3 and 2/3 (volume Than) 100mm × 100mm × 100mm cube specimen, 1d, 28d two-sided cutting intensity are respectively 1.60MPa, 3.50MPa.
When this interfacial adhesion strengthening material is used for the grouting material of post-tensioning prestressed steel concrete, with steel strand wires Caking property is good, and reinforcing bar extraction destructive testing shows that splitting occurs in material and pulls open the destruction of bad or attrition crushing or failure, and non-slip Move or extract failure.Cement base new-old concrete interfacial adhesion strengthening material of the present invention has raw material sources abundant, anti-in early days The relatively high and stable property of Compressive Strength, three-point bending resistance intensity, tensile splitting strength, two-sided shearing strength is good, under pressure body Product stablizes good and not bleeding, can solve deficiency and defect existing for traditional material.

Claims (8)

1. a kind of cement base new-old concrete interfacial adhesion strengthening material, it is characterised in that: by portland cement, water-reducing agent, silicon Ash, flyash, micro-expanding agent, river sand and water composition, the weight proportion of each raw material component are as follows: portland cement 620-640Kg/ m3, silicon ash 34-50Kg/m3, flyash 37-64Kg/m3, water-reducing agent 35-45Kg/m3, micro-expanding agent 80-120Kg/m3, river sand 1150-1250Kg/m3, water 270-280Kg/m3。
2. a kind of cement base new-old concrete interfacial adhesion strengthening material according to claim 1, it is characterised in that: described Portland cement be P. II, strength grade is not less than 42.5MPa, and the total content of dicalcium silicate and tricalcium silicate is not less than 70%, The content of tricalcium aluminate is not higher than 8%.
3. a kind of cement base new-old concrete interfacial adhesion strengthening material according to claim 1, it is characterised in that: described Water-reducing agent be polycarboxylate high performance dehydragent, water-reducing rate be not less than 25%.
4. a kind of cement base new-old concrete interfacial adhesion strengthening material according to claim 1, it is characterised in that: described Silicon ash be refining silicon steel obtained by byproduct be process through levigate, specific surface area > 20m2/g。
5. a kind of cement base new-old concrete interfacial adhesion strengthening material according to claim 1, it is characterised in that: described Flyash be I grades of flyash.
6. a kind of cement base new-old concrete interfacial adhesion strengthening material according to claim 1, it is characterised in that: described Micro-expanding agent be early-strength micro-expanding agent.
7. a kind of cement base new-old concrete interfacial adhesion strengthening material according to claim 1, it is characterised in that: described River sand be the clean river sand through washing, fineness modulus 2.6-2.9.
8. a kind of preparation method of the described in any item cement base new-old concrete interfacial adhesion strengthening materials of claim 1-7, Characterized by comprising the following steps:
(1) silicon ash, portland cement, flyash, river sand, micro-expanding agent are subjected to premixing and are bonded to uniform state, obtain even mixing One；
(2) water-reducing agent, water are stirred evenly in high-speed mixer, obtains even mixing two；
(3) even mixing two is added into even mixing one to stir evenly and both obtains cement base new-old concrete interfacial adhesion Rankine Material.
CN201910480767.1A 2019-06-04 2019-06-04 A kind of cement base new-old concrete interfacial adhesion strengthening material and preparation method Pending CN110156402A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005231981A (en) * 2004-02-23 2005-09-02 Ps Mitsubishi Construction Co Ltd Admixing agent for grout material and grout material
EP1876154A1 (en) * 2006-06-29 2008-01-09 Services Pétroliers Schlumberger Cement slurry with low water to cement ratio
CN101234876A (en) * 2008-02-29 2008-08-06 武汉理工大学 Method for preparing antiskid wearable lightweight steel box girder bridge floor paving layer
CN101462861A (en) * 2008-12-17 2009-06-24 同济大学 Grouting material for post-stressed concrete pore passage and preparation thereof
CN102690092A (en) * 2012-06-04 2012-09-26 同济大学 Low-temperature rice hull ash doped cement-base shrinkage-free grouting material and using method thereof
CN103159443A (en) * 2013-03-14 2013-06-19 中建商品混凝土有限公司 Ultrahigh-strength concrete and preparation method thereof
CN105645886A (en) * 2015-12-30 2016-06-08 中国铁道科学研究院铁道建筑研究所 Rapid repairing material of seam between CRTS II shaping plate ballastless track boards
CN106007550A (en) * 2016-01-25 2016-10-12 湖南省建筑工程集团总公司 Large flow pattern non-shrinkage anti-crack concrete grouting material
CN106882943A (en) * 2017-03-30 2017-06-23 南通职业大学 A kind of strength cement-based grouting material suitable for chlorion hyposmosis

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005231981A (en) * 2004-02-23 2005-09-02 Ps Mitsubishi Construction Co Ltd Admixing agent for grout material and grout material
EP1876154A1 (en) * 2006-06-29 2008-01-09 Services Pétroliers Schlumberger Cement slurry with low water to cement ratio
CN101234876A (en) * 2008-02-29 2008-08-06 武汉理工大学 Method for preparing antiskid wearable lightweight steel box girder bridge floor paving layer
CN101462861A (en) * 2008-12-17 2009-06-24 同济大学 Grouting material for post-stressed concrete pore passage and preparation thereof
CN102690092A (en) * 2012-06-04 2012-09-26 同济大学 Low-temperature rice hull ash doped cement-base shrinkage-free grouting material and using method thereof
CN103159443A (en) * 2013-03-14 2013-06-19 中建商品混凝土有限公司 Ultrahigh-strength concrete and preparation method thereof
CN105645886A (en) * 2015-12-30 2016-06-08 中国铁道科学研究院铁道建筑研究所 Rapid repairing material of seam between CRTS II shaping plate ballastless track boards
CN106007550A (en) * 2016-01-25 2016-10-12 湖南省建筑工程集团总公司 Large flow pattern non-shrinkage anti-crack concrete grouting material
CN106882943A (en) * 2017-03-30 2017-06-23 南通职业大学 A kind of strength cement-based grouting material suitable for chlorion hyposmosis

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Application publication date: 20190823