CN109574527A - A kind of functionality cement selfreparing manufactured aggregate and preparation method thereof - Google Patents
A kind of functionality cement selfreparing manufactured aggregate and preparation method thereof Download PDFInfo
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- CN109574527A CN109574527A CN201811536838.7A CN201811536838A CN109574527A CN 109574527 A CN109574527 A CN 109574527A CN 201811536838 A CN201811536838 A CN 201811536838A CN 109574527 A CN109574527 A CN 109574527A
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- selfreparing
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- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/06—Acrylates
-
- 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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a kind of functional cement selfreparing manufactured aggregates and preparation method thereof.The method comprising the steps of: (1) being uniformly mixed selfreparing active component, be further filled in compression mold；(2) with tablet press machine to compression mold pressurization, pressure maintaining, demoulding obtains aggregate green body；(3) obtained aggregate green body is put into PMMA acetone soln and is coated, take out drying, repeated several times.Obtain the selfreparing manufactured aggregate having a size of 6 ± 1mm.The method of the present invention production cost is low, simple process, and active powder is pressed into aggregate, has higher-strength, on the one hand can resist stirring external force, on the other hand smaller to the negative effect of concrete substrate intensity；The waterproof clad of active aggregates avoids the selfreparing active component before cracking and contacts the premature failure that reacts with matrix environment, guarantee that selfreparing component gives full play to the effect for repairing crack after crack occurs, while also avoiding its expansion reaction causes concrete to crack in advance.
Description
Technical field
The present invention relates to functional cement technology field, and in particular to a kind of functionality cement selfreparing manufactured aggregate and its system
Preparation Method.
Background technique
Concrete is one of maximum construction material of current dosage, and concrete is in addition to serving as building structure till now
Load-bearing effect also gradually develops to " intelligence ", " functionalization ".Such as nano-TiO is mixed in cement or concrete2, graphite,
The wave absorbing agents such as ferrite are to make it have the cement-base composite wave-absorbing material of electromagnetic wave absorption functions, at civilian aspect, it was both
Radiation of the maskable electromagnetic wave to human body, and the leaking data of computer center can be prevented, play privacy functions.Militarily,
Cement-base composite wave-absorbing material can play interference radar detection target, avoid the military attack of enemy.For another example in all kinds of buildings
In the long-time service of engineering structure, environmental attack, material aging, the degeneration that will lead to structural material performance, so that resisting certainly
The ability of right disaster declines, and even causes catastrophic failure under extreme case.Before civil engineering structure generation accident, in structure
It often will appear the symptoms such as crack, uneven precipitating, steel bar corrosion.In order to avoid disaster generation, scientist is by cement base piezoelectric
Composite material is embedded in some Important buildings as sensing element, to its key position stress, displacement and total
Dynamic characteristic be measured in real time.This sensor is special without changing structure in embedded concrete structure as aggregate
Property, there is good compatibility with concrete substrate.
Self-repairing cement-base material causes the interest of a large amount of scholars in numerous functional cement materials.It is well-known
Concrete is a kind of fragile material, and tensile strength is low, concrete structure construction and be on active service during, by temperature and humidity variation,
The influence of the factors such as external loads, concrete can generate various sizes of crack.These cracks are corrosive medium (Cl-、
SO4 2-、Mg2+Deng) diffusion provide channel, on the one hand accelerate diffusion velocity of the corrosive medium to inside concrete.Another party
These corrosive mediums of face also corrode reinforcing bar other than deteriorating the performance of concrete itself, to allow reinforced concrete
Soil structure premature failure, or even cause catastrophic failure.In order to extend reinforced concrete structure service life, usually to concrete
It is manually repaired in crack.However engineering practice shows manually to repair crack that the effect is unsatisfactory, repair usually compared with
Short time just fails, and manually reparation can only repair concrete structure surface layer crack, can not repair inside configuration crack.
Therefore, scholar proposes " concrete self-repair technology ", i.e. the built-in renovation agent in concrete formation, when structure takes
It cracks when labour, crack triggering renovation agent is contacted with external environment to react, and the reparation product of generation blocks crack, to prevent
Extraneous corrosive medium enters inside configuration, extending structure service life.Existing crack autogenous healing agent is broadly divided into three kinds:
1. based on microcapsules/fiberglass pipe crack autogenous healing technology: the technology to concrete by being added containing binder
Fiberglass pipe or microcapsules, when structure cracks, fiberglass pipe or microcapsules are run through by crack, the binder included
Outflow hardening, to block crack.However since the core material of fiberglass pipe or microcapsules is that the almost nil liquid phase of intensity is viscous
Tie agent, it is difficult to be effective against the shearing and collision of whipping process, and largely reduce matrix strength.
2. the crack autogenous healing technology based on microorganism: the technology is mainly added to water using microorganism as active component
In mud material, calcium carbonate is induced to be formed to block crack in crack by the mineralization of microorganism.Its difficult point is to mix
The internal high alkali environment of solidifying soil is not suitable for the survival of microorganism, at the same with heat evolution velocity concrete aperture reduce can also cause it is interior
Portion microorganism is pressurized lethal.If microorganism to be therefore added directly into cement material to the activity that will seriously reduce microorganism,
Microorganism is difficult to long-term surviving.On the other hand, the mineralization of microorganism also needs to add such as urea, organic calcium " nutrients
Matter ".These " nutriments " are directly added into the working performance that will affect cement concrete.
3. the self-repair technology based on addition active component: this method is with intumescent mineral material and crystal type mineral material
As active component, crack autogenous healing is realized using their hydration reaction.However, the directly addition of active component is on the one hand
It will lead to it to react ahead of time before concrete cracking, premature failure, self-repair function is limited；On the other hand for dilatancy activity
Component, the bulbs of pressure cause concrete substrate to crack in advance.
It can be seen from the above, directly addition of the active component in cement-based material is to cement concrete matrix and renovation agent sheet
Body causes adverse effect.
Summary of the invention
It is an object of the invention to be directed to prior art defect and technological gap, a kind of functional cement selfreparing is provided
The preparation method of manufactured aggregate.The aggregate is made of selfreparing active component green body with the waterproof clad for providing mechanical strength.
Selfreparing active component is pressed by aggregate green body using direct compression method, then coats several layers PMMA on its surface, is prepared
There are certain anti-stirring intensity, the cement-based material selfreparing aggregate of waterproof.Preparation method is simple, at low cost, by adjusting system
Standby technique can size to selfreparing aggregate and intensity control.
The purpose of the present invention is achieved through the following technical solutions.
A kind of cement-based material selfreparing aggregate processing method, includes the following steps:
1) selfreparing active component is uniformly mixed, is further filled in direct tablet compressing mold；
2) with tablet press machine to direct tablet compressing mould pressurizing, pressure maintaining, demoulding obtains aggregate green body；
3) obtained aggregate green body is put into PMMA acetone soln and is wrapped up, take out drying, repeated several times are reviewed one's lessons by oneself
Multiple manufactured aggregate.
Further, active using calcium oxide, sodium metaaluminate and macromolecule water uptake resin as reviewing one's lessons by oneself in step (1)
Component.
Further, in step (1), the weight ratio of calcium oxide, sodium metaaluminate and macromolecule water uptake resin is 2-3:1:
0-1。
Further, in step (1), the material mixing is mixed using V-type batch mixer.
Further, in step (2), the pressure of the pressurization is 250 ~ 750 psi.
Further, in step (2), the pressure of the pressure maintaining is 250 ~ 750 psi, and the time is 30 ~ 60s.
Further, in step (3), the concentration of the PMMA acetone soln is 0.2 ~ 0.3g/mL.
Further, in step (3), the drying is dry in draught cupboard.
Further, in step (3), the repeated several times are 3-6 times.
It is artificial to mix above-mentioned functional cement selfreparing in the selfreparing cement paste for a kind of selfreparing cement paste
Aggregate, and the selfreparing aggregate is with 3% ~ 5% incorporation of cement paste volume fraction.
According to the above method be prepared selfreparing manufactured aggregate having a size of 6 ± 1mm with have self-healing properties from
Repair cement paste.
Compared with prior art, the invention has the advantages that and the utility model has the advantages that
(1) production cost of the invention is low, simple process, and active powder is pressed into aggregate, has higher-strength, one side energy
Stirring external force is resisted, it is on the other hand smaller to the negative effect of concrete substrate intensity.
(2) active component is prepared into aggregate green body by the present invention, outsourcing waterproof clad, to completely cut off before reaching MATRIX CRACKING
The contact of active component and matrix environment avoids the selfreparing active component before cracking and contacts to occur instead with matrix environment
Premature failure is answered, guarantees that selfreparing component gives full play to the effect for repairing crack after crack occurs, while it is swollen to also avoid its
Swollen reaction causes concrete to crack in advance.
Detailed description of the invention
Fig. 1 is aggregate green body schematic diagram prepared by inventive embodiments 1；
Fig. 2 is selfreparing manufactured aggregate schematic diagram prepared by inventive embodiments 1；
Fig. 3 is photo before selfreparing manufactured aggregate fracture prepared by inventive embodiments 1 is repaired；
Fig. 4 is photo after selfreparing manufactured aggregate fracture prepared by inventive embodiments 2 is repaired.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with specific embodiment and attached drawing, but of the invention
Protection scope and embodiment are without being limited thereto.
In the specific embodiment of the invention, the purity of the calcium oxide used is pure to analyze, and granularity is 200 mesh；The inclined aluminium used
The purity of sour sodium is that analysis is pure, and granularity is 200 mesh；For the macromolecule water uptake resin used for technical grade, granularity is 50-60 mesh.
Embodiment 1
Cement-based material selfreparing aggregate processing, the specific steps are as follows:
(1) using calcium oxide, sodium metaaluminate, low cross-linking type Sodium Polyacrylate (hydroscopic high-molecular resin) as selfreparing active group
Point.74g calcium oxide, 25g sodium metaaluminate, 1g low cross-linking type Sodium Polyacrylate are weighed respectively, and it is equal to put into mixing in V-type batch mixer
It is even, it takes in appropriate mixed material filling direct tablet compressing mold and assembles mold.
(2) with tablet press machine to direct tablet compressing mould pressurizing to 500 psi, and 60 s of pressure maintaining, subsequent demoulding obtain aggregate base
Body, as shown in Figure 1.
(3) aggregate green body is immersed in the PMMA acetone soln of 0.2g/mL, is taken after aggregate billet surface sufficiently soaks
Aggregate green body out is placed in drying in draught cupboard and volatilizees completely to acetone.Submergence is 6 times dry repeatedly, finally obtains having a size of 6
The selfreparing aggregate of ± 1mm, as shown in Figure 2.
It (4) can in conjunction with Fig. 3 when hardened paste cracking with 5% incorporation of cement paste volume by selfreparing manufactured aggregate
Know, cement briquette is made to have repaired the crack of 600mm after selfreparing manufactured aggregate, can effectively stop environment etching medium to enter matrix
It is internal.
Embodiment 2
Cement-based material selfreparing aggregate processing, the specific steps are as follows:
(1) using calcium oxide, sodium metaaluminate, low cross-linking type Sodium Polyacrylate (hydroscopic high-molecular resin) as selfreparing active group
Point.63g calcium oxide, 25g sodium metaaluminate, 0.5g low cross-linking type Sodium Polyacrylate are weighed respectively, and it is equal to put into mixing in V-type batch mixer
It is even, it takes in appropriate mixed material filling direct tablet compressing mold and assembles mold.
(2) with tablet press machine to direct tablet compressing mould pressurizing to 750psi, and 30 s of pressure maintaining, subsequent demoulding obtain aggregate base
Body, as shown in Figure 1.
(3) aggregate green body is immersed in the PMMA acetone soln of 0.25g/mL, after aggregate billet surface sufficiently soaks
Aggregate green body is taken out, drying in draught cupboard is placed in and volatilizees completely to acetone.Submergence is 4 times dry repeatedly, finally obtains having a size of 6
The selfreparing aggregate of ± 1mm, as shown in Figure 2.
It (4) can in conjunction with Fig. 4 when hardened paste cracking with 4% incorporation of cement paste volume by selfreparing manufactured aggregate
Know, cement briquette is made to have repaired the crack of 400mm after selfreparing manufactured aggregate, can effectively stop environment etching medium to enter matrix
It is internal.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of functionality cement selfreparing manufactured aggregate, which is characterized in that including selfreparing active component and waterproof clad,
The selfreparing active component is calcium oxide, sodium metaaluminate and macromolecule water uptake resin, and waterproof clad is PMMA, and is coated
Selfreparing active component.
2. functional cement selfreparing manufactured aggregate according to claim 1, which is characterized in that calcium oxide, sodium metaaluminate and
The weight ratio of macromolecule water uptake resin is 2-3:1:0-1.
3. the preparation method of functionality cement selfreparing manufactured aggregate as claimed in claim 1 or 2, which is characterized in that including as follows
Step:
(1) selfreparing active component is uniformly mixed, is further filled in direct tablet compressing mold；
(2) with tablet press machine to direct tablet compressing mould pressurizing, pressure maintaining, demoulding obtains aggregate green body；
(3) obtained aggregate green body is put into PMMA acetone soln and is wrapped up, take out drying, repeated several times obtain certainly
Repair manufactured aggregate.
4. preparation method according to claim 1, which is characterized in that in step (1), the material mixing is using V-type
Batch mixer mixing.
5. preparation method according to claim 1, which is characterized in that in step (2), the pressure of the pressurization is 250 ~
750psi。
6. preparation method according to claim 1, which is characterized in that in step (2), the pressure of the pressure maintaining is 250 ~
750psi, time are 30 ~ 60s.
7. preparation method according to claim 1, which is characterized in that in step (3), the concentration of the PMMA acetone soln
For 0.2 ~ 0.3g/mL.
8. preparation method according to claim 1, which is characterized in that in step (3), the repeated several times are 3-6 times.
9. preparation method according to claim 1, which is characterized in that in step (3), the drying is done in draught cupboard
It is dry.
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| CN201811536838.7A CN109574527B (en) | 2018-12-15 | 2018-12-15 | Functional cement self-repairing artificial aggregate and preparation method thereof |
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| CN201811536838.7A CN109574527B (en) | 2018-12-15 | 2018-12-15 | Functional cement self-repairing artificial aggregate and preparation method thereof |
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Cited By (2)
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| CN110424330A (en) * | 2019-07-18 | 2019-11-08 | 华南理工大学 | A kind of cement-based material crack self repairing agent and the preparation method and application thereof of curable sea water intrusion ion |
| CN113880481A (en) * | 2021-11-19 | 2022-01-04 | 交通运输部公路科学研究所 | Cement-based recycled aggregate coating method for asphalt mixture |
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