CN110372310A - A kind of cracking resistance self-repair concrete and preparation method thereof - Google Patents
A kind of cracking resistance self-repair concrete and preparation method thereof Download PDFInfo
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- CN110372310A CN110372310A CN201910685435.7A CN201910685435A CN110372310A CN 110372310 A CN110372310 A CN 110372310A CN 201910685435 A CN201910685435 A CN 201910685435A CN 110372310 A CN110372310 A CN 110372310A
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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
- 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
- C04B20/0008—Materials specified by a shape not covered by C04B20/0016 - C04B20/0056, e.g. nanotubes
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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
- 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
- C04B28/18—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 mixtures of the silica-lime type
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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
- 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
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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
- 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
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of cracking resistance self-repair concrete and preparation method thereof, cracking resistance self-repair concrete includes 200-300 parts of cement, 100-180 parts of flyash, 500-700 parts of rubbles, 80-140 parts of water, 40-60 parts of semi-hydrated gypsums, 50-100 parts of silicon powders, 20-40 parts of polypropylene fibres, 10-15 parts of silane coupling agents, 60-80 parts of calcium oxide, 5-10 parts of water-reducing agents, 30-50 parts of ammonium chlorides, 10-20 parts of barium hydroxides；Preparation method is mixed concrete slurry, cement, flyash, rubble, semi-hydrated gypsum and silicon powder are subjected to mix, stir 30-40min, water-reducing agent and water is added, after stirring 5-10min, ammonium chloride and barium hydroxide is added, stirs 40-60min, obtains concrete slurry after polypropylene fibre and silane coupling agent stirring 20-30min is then added；By calcium oxide sealing loaded in fiberglass pipe, the fiberglass pipe mix equipped with calcium oxide is then obtained into cracking resistance self-repair concrete in concrete slurry.The present invention have the advantages that preparation concrete anticracking, selfreparing crack and repair after intensity it is higher.
Description
Technical field
The present invention relates to building material technical field, more specifically, it relates to a kind of cracking resistance self-repair concrete and its
Preparation method.
Background technique
Concrete structure has many advantages, such as that good compression strength, globality, normability are good, and cost is not high, thus
Be widely used with industry with civil buildings in.But concrete structure is in use inevitable that crack is deposited
These cracks have plenty of load Crack, have plenty of thermal cracking, and the presence in crack makes extraneous corrosive liquids and gas
Corrosion reinforcing bar inside into concrete structure, causes structural bearing capacity to decline, crack further expansion, final to reduce concrete knot
The service life of structure.Therefore, repairing concrete crack is the important measures in extending structure service life.
Main crack repairs means mainly or by periodically to the inspection of structure and manually filling up reparation and split at present
Seam builds effect to reach, and the more serious structure of some crack developings will be rebuild, these reparation means not only increase repetition
The number of construction, improves cost, if repair materials and concrete compatibility are bad, at crack between repair materials also pole
Easy fracture, repairing effect are bad.And in actual concrete works structure, many fine cracks occur in its structure
Portion, if the damage of these microscopic ranges before developing into macrocrack, can be repaired timely and effectively, then by big
It is big to reduce later period repairing or maintenance cost, improve the safety and service life of structure.Because actively perceive and can repair mixed
The self-repair technology of solidifying soil cracking seam becomes the research hotspot of concrete field.
The research of self-repair concrete at home and abroad obtains interim progress in recent years, and the principle of self-repair concrete is also more
Kind multiplicity has using being added containing microbial capsules, has using marmem, but bacterium is high in this way in concrete
It is difficult to survive in the environment of basicity, and forming memory is fairly expensive material, therefore researches and develops a kind of cheap, construction letter
Just, repairing concrete crack can be maintained and guarantee that the self-repair concrete of its intensity is the needs of era development.
Summary of the invention
In view of the deficienciess of the prior art, the first purpose of this invention is to provide a kind of cracking resistance selfreparing coagulation
Soil, have the advantages that cracking resistance, selfreparing crack and repair after intensity it is higher.
Second object of the present invention is to provide a kind of preparation method of cracking resistance self-repair concrete have preparation
The higher advantage of intensity after concrete anticracking, selfreparing crack and reparation.
To realize above-mentioned first purpose, the present invention provides the following technical scheme that a kind of cracking resistance self-repair concrete, packet
It includes and is made of raw material from the following weight: 200-300 parts of cement, 100-180 parts of flyash, 500-700 parts of rubbles, 80-140 parts
Water, 40-60 part semi-hydrated gypsum, 50-100 parts of silicon powders, 20-40 parts of polypropylene fibres, 10-15 parts of silane coupling agents, 60-80 parts of oxygen
Change calcium, 5-10 parts of water-reducing agents, 30-50 parts of ammonium chlorides, 10-20 parts of barium hydroxides；The calcium oxide sealing is loaded on glass fibers
It is used in dimension pipe.
By using above-mentioned technical proposal, ammonium chloride and barium hydroxide reaction generate barium chloride, ammonia and water, this is anti-
It should be the endothermic reaction, during concrete mixing, a part can be absorbed because of the partial heat that hydrated cementitious generates, thus
The temperature difference for reducing concrete inside and outside weakens the crack phenomenon of concrete, that is, reduces the fracture width of concrete；In addition, product
Ammonia is highly soluble in water, when concrete generates crack, glass tracheal rupture, ammonium hydroxide and carbon dioxide exposure, production ammonium carbonate and carbon
Sour hydrogen ammonium, ammonium carbonate or Ammonium bicarbonate food grade are contacted with calcium oxide generates calcium carbonate solid, mends a split to realize.Sodium bentonite
With good water imbibition, large quantity of moisture can be absorbed during concrete mixing, on the one hand can effectively inhibit concrete
The volume contraction of generation inhibits the production in crack, and then reduces the width in crack, on the other hand, for the dilatant water of storage
Change and aquation be provided, can be mended a split in cracking with rapid expanding, in addition to this, polypropylene fibre and silane coupling agent plus
Enter the crack resistance of concrete can be improved, and then influence the width of later period distress in concrete, to have better self-repairability
Can, and make the concrete after repairing that there is stronger compression strength.Silicon powder both can use the suction that its adsorptivity carries out water
It chimes in and plays the role of selfreparing, and its generation that can also increase silicic acid anhydride calcium crystal, thus filling concrete particle
Between, connection structure is strengthened, to play the role of selfreparing.In addition to this, it is combined between semi-hydrated gypsum, silicon powder and water,
With biggish setting expansion and thermal expansion, to can both be filled between cement granules, be conducive to the selfreparing in later period, and
And also there is biggish intensity, final cracking resistance self-repair concrete obtained is with intensity after cracking resistance, selfreparing crack and reparation
Higher feature.
Further, the cracking resistance self-repair concrete includes being made of raw material from the following weight: 230-280 parts of water
Mud, 130-160 part flyash, 550-650 parts of rubbles, 100-120 parts of water, 45-55 parts of semi-hydrated gypsums, 70-80 parts of silicon powders, 25-
35 parts of polypropylene fibres, 12-14 parts of silane coupling agents, 65-75 parts of calcium oxide, 6-8 parts of water-reducing agents, 35-45 parts of ammonium chlorides, 12-
18 parts of barium hydroxides；The calcium oxide sealing is loaded on use in fiberglass pipe.
Further, the cracking resistance self-repair concrete includes being made of raw material from the following weight: 250 parts of cement, 150
Part flyash, 600 parts of rubbles, 110 parts of water, 50 parts of semi-hydrated gypsums, 80 parts of silicon powders, 30 parts of polypropylene fibres, 12 parts it is silane coupled
Agent, 70 parts of calcium oxide, 8 parts of water-reducing agents, 40 parts of ammonium chlorides, 15 parts of barium hydroxides；The calcium oxide sealing is loaded on glass fibers
It is used in dimension pipe.
Further, the cement includes Portland pozzolana cement, the slag silicate salt water that mass ratio is 1::12
Mud.
Further, the flyash is FI grades of flyash；The rubble is the broken of the continuous size fraction that partial size is 5-20mm
Stone.
Further, the water-reducing agent is that polycarboxylate water-reducer or sodium lignin sulfonate or both are mixed with arbitrary proportion
It closes.
Further, the polypropylene fibre length is 12-16mm；The silicon powder partial size is 0.1-0.2 μm.
To realize above-mentioned second purpose, the present invention provides the following technical scheme that a kind of cracking resistance self-repair concrete
Preparation method, comprising the following steps:
Cement, flyash, rubble, semi-hydrated gypsum and silicon powder are carried out mix, stir 30-40min, add by mixed concrete slurry
Enter water-reducing agent and water, after stirring 5-10min, ammonium chloride and barium hydroxide is added, stirs 40-60min, is then added poly- third
Concrete slurry is obtained after alkene fiber and silane coupling agent stirring 20-30min；
Calcium oxide sealing is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete slurry
In, obtain cracking resistance self-repair concrete.
By using above-mentioned technical proposal, the substances such as cement, flyash are mixed, water-reducing agent and water is then added,
Aquation occurs for cement, and ammonium chloride and barium hydroxide is then added, and the endothermic reaction occurs for ammonium chloride and barium hydroxide, together
When, hydration heat occurs for cement, is stirred simultaneously, to reduce the inside and outside temperature difference of concrete, it is fine that polypropylene is then added
Peacekeeping silane coupling agent, polypropylene fibre are filled between cement granules, and larger substance is prevented to be settled, and play the work of cracking resistance
With, it is then that the glass fibre mix equipped with calcium oxide is spare in concrete slurry, when allowing concrete to crack, ammonia
Water and carbon dioxide exposure generate ammonium carbonate and ammonium hydrogen carbonate, then contact with calcium oxide, calcium carbonate solid are generated, to play
The effect to mend a split.
Further, the length of the fiberglass pipe is 8-12mm.
By using above-mentioned technical proposal, mix fiberglass pipe and concrete slurry were so both facilitated, and in coagulation
More fiberglass pipes can also be distributed in soil paste material, concrete cracking when increases calcium oxide and ammonium carbonate or carbon
The contact area of sour hydrogen ammonium.
In conclusion the invention has the following advantages:
1, in the present invention on the one hand a part can be absorbed because of cement water in the addition of ammonium chloride, barium hydroxide and calcium oxide
Change the partial heat generated and weaken the crack phenomenon of concrete to reduce the temperature difference of concrete inside and outside, is i.e. reduction concrete
Fracture width, when another aspect concrete cracking, the ammonium carbonate or Ammonium bicarbonate food grade of generation are contacted with calcium oxide generates calcium carbonate
Solid realizes crack autogenous healing to mend a split；
2, sodium bentonite has good water imbibition in the present invention, and large quantity of moisture can be absorbed during concrete mixing,
On the one hand the volume contraction that can effectively inhibit concrete to generate inhibits the production in crack, and then reduces the width in crack, another
Aspect provides aquation for the dilatant aquation of storage, can be mended a split in cracking with rapid expanding；
3, the crack resistance of concrete can be improved in the addition of polypropylene fibre and silane coupling agent in the present invention, and then influences the later period
The width of distress in concrete, to have better self-healing properties, and it is stronger anti-to have the concrete after repairing
Compressive Strength；
4, silicon powder both can use its adsorptivity and carry out the absorption of water to play the role of selfreparing in the present invention, and it is also
The generation of silicic acid anhydride calcium crystal can be increased, to strengthen connection structure between filling concrete particle, reviewed one's lessons by oneself to play
Multiple effect；
5, it is combined between semi-hydrated gypsum, silicon powder and water, there is biggish setting expansion and thermal expansion, to can both be filled in water
Between mud particle, be conducive to the selfreparing in later period, but also there is biggish intensity, final cracking resistance self-repair concrete obtained
Have the characteristics that cracking resistance, selfreparing crack and repair after intensity it is higher.
Specific embodiment
Invention is further described in detail with reference to embodiments.
Following raw material is commercially available to be obtained.
The present invention provides technical solution, and selfreparing crack may be implemented to reach concrete cracking.
A kind of cracking resistance self-repair concrete, is made of raw material once: 200-300 parts of cement, 100-180 parts of fine coal
Ash, 500-700 parts of rubbles, 80-140 parts of water, 40-60 parts of semi-hydrated gypsums, 50-100 parts of silicon powders, 20-40 parts of polypropylene fibres,
10-15 parts of silane coupling agents, 60-80 parts of calcium oxide, 5-10 parts of water-reducing agents, 30-50 parts of ammonium chlorides, eight water hydroxide of 10-20 part
Barium；The calcium oxide sealing is loaded on use in fiberglass pipe.
Preparation method is mixed concrete slurry, and cement, flyash, rubble, semi-hydrated gypsum and silicon powder are carried out mix,
30-40min is stirred, water-reducing agent and water is added, after stirring 5-10min, ammonium chloride and barium hydroxide is added, stirs 40-
60min obtains concrete slurry after polypropylene fibre and silane coupling agent stirring 20-30min is then added；
Calcium oxide sealing is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete slurry
In, obtain cracking resistance self-repair concrete.
Silicon powder partial size is 0.1-0.2 μm, purchased from Zhengzhou City's gold along Nai Cai Co., Ltd；
The cement amount of including (is purchased from Suzhou Jie Qianhong building materials Co., Ltd, brand is than the Portland pozzolana cement for 1:1-2
Prompt modest macro, article No. 0021, intensity is P.O 42.5), portland slag cement (is purchased from the emerging holding limited public affairs of group of Beijing swallow
Department, the name of an article are to bore board portland slag cement PSA 32.5, and brand is to bore board, intensity 32.5)；
Flyash is FI grades of flyash, is purchased from Shijiazhuang Chi Lin mineral products Co., Ltd, and brand is continuous heavy rain of speeding；
Rubble is the rubble of the continuous size fraction of 5-20mm, is purchased from Beijing's Miyun County Xihe River rock crushing plant；
Water-reducing agent is polycarboxylate water-reducer (being purchased from Shandong Bock chemistry limited liability company, model BKS-199) or lignin
Sodium sulfonate (purchased from hundred million new materials (Guangzhou) Co., Ltd is opened up) or both is mixed with arbitrary proportion；
Semi-hydrated gypsum is that gypsum is heated to 150 DEG C of dehydrations to be prepared；
Silane coupling agent is purchased from Nanjing Quan Xi Chemical Co., Ltd., brand Quan Xi, model KH-590；
Polypropylene fibre length is 3-12mm, is purchased from Langfang Venus Chemical Co., Ltd., model wi70870.
Embodiment 1
A kind of preparation method of cracking resistance self-repair concrete, comprising the following steps:
Mixed concrete slurry, by 250kg cement, 150kg flyash, 600kg rubble, 50kg semi-hydrated gypsum and 80kg silicon powder into
Row mix stirs 35min, and 8kg water-reducing agent and 110kg water is added, and after stirring 8min, 40kg ammonium chloride and eight water hydrogen of 15kg is added
Barium monoxide stirs 50min, obtains concrete after 30kg polypropylene fibre and 13kg silane coupling agent stirring 25min is then added
Slurry；
The sealing of 70kg calcium oxide is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete
In slurry, cracking resistance self-repair concrete is obtained.
Wherein, cement includes the Portland pozzolana cement and portland slag cement that mass ratio is 1:1.5；
Water-reducing agent is polycarboxylate water-reducer；
The length of fiberglass pipe is 10mm.
Embodiment 2
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that,
Mixed concrete slurry, by 230kg cement, 130kg flyash, 550kg rubble, 45kg semi-hydrated gypsum and 70kg silicon powder into
Row mix stirs 35min, and 6kg water-reducing agent and 100kg water is added, and after stirring 8min, 35kg ammonium chloride and eight water hydrogen of 12kg is added
Barium monoxide stirs 50min, obtains concrete after 25kg polypropylene fibre and 12kg silane coupling agent stirring 25min is then added
Slurry；
The sealing of 65kg calcium oxide is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete
In slurry, cracking resistance self-repair concrete is obtained.
Embodiment 3
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that,
Mixed concrete slurry, by 280kg cement, 160kg flyash, 650kg rubble, 55kg semi-hydrated gypsum and 80kg silicon powder into
Row mix stirs 35min, and 8kg water-reducing agent and 120kg water is added, and after stirring 8min, 45kg ammonium chloride and eight water hydrogen of 18kg is added
Barium monoxide stirs 50min, obtains concrete after 35kg polypropylene fibre and 14kg silane coupling agent stirring 25min is then added
Slurry；
The sealing of 75kg calcium oxide is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete
In slurry, cracking resistance self-repair concrete is obtained.
Embodiment 4
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that,
Mixed concrete slurry, by 200kg cement, 100kg flyash, 500kg rubble, 40kg semi-hydrated gypsum and 50kg silicon powder into
Row mix stirs 35min, and 5kg water-reducing agent and 80kg water is added, and after stirring 8min, 30kg ammonium chloride and eight water hydrogen of 10kg is added
Barium monoxide stirs 50min, obtains concrete after 20kg polypropylene fibre and 10kg silane coupling agent stirring 25min is then added
Slurry；
The sealing of 60kg calcium oxide is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete
In slurry, cracking resistance self-repair concrete is obtained.
Embodiment 5
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that,
Mixed concrete slurry, by 300kg cement, 180kg flyash, 700kg rubble, 60kg semi-hydrated gypsum and 100kg silicon powder
Mix is carried out, 35min is stirred, 10kg water-reducing agent and 140kg water is added, after stirring 8min, 50kg ammonium chloride and 20kg eight is added
Water barium hydroxide stirs 50min, is mixed after 40kg polypropylene fibre and 15kg silane coupling agent stirring 25min is then added
Solidifying soil paste material；
The sealing of 80kg calcium oxide is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete
In slurry, cracking resistance self-repair concrete is obtained.
Embodiment 6
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, cement packet
Include Portland pozzolana cement, the Portland fly ash cement that mass ratio is 1:1.
Embodiment 7
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, cement packet
Include Portland pozzolana cement, the Portland fly ash cement that mass ratio is 1:2.
Embodiment 8
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that,
Mixed concrete slurry, by 250kg cement, 150kg flyash, 600kg rubble, 50kg semi-hydrated gypsum and 80kg silicon powder into
Row mix stirs 30min, and 8kg water-reducing agent and 110kg water is added, and after stirring 5min, 40kg ammonium chloride and eight water hydrogen of 15kg is added
Barium monoxide stirs 40min, obtains concrete after 30kg polypropylene fibre and 13kg silane coupling agent stirring 20min is then added
Slurry；
The sealing of 70kg calcium oxide is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete
In slurry, cracking resistance self-repair concrete is obtained.
Embodiment 9
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that,
Mixed concrete slurry, by 250kg cement, 150kg flyash, 600kg rubble, 50kg semi-hydrated gypsum and 80kg silicon powder into
Row mix stirs 40min, and 8kg water-reducing agent and 110kg water is added, and after stirring 10min, 40kg ammonium chloride and eight water of 15kg is added
Barium hydroxide stirs 60min, obtains coagulation after 30kg polypropylene fibre and 13kg silane coupling agent stirring 30min is then added
Soil paste material；
The sealing of 70kg calcium oxide is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete
In slurry, cracking resistance self-repair concrete is obtained.
Embodiment 10
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, water-reducing agent
For naphthalene water reducer.
Embodiment 11
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, water-reducing agent
For polycarboxylate water-reducer and naphthalene water reducer, and the two ratio is 1:1.
Embodiment 12
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, glass fibers
The length for tieing up pipe is 8mm.
Embodiment 13
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, glass fibers
The length for tieing up pipe is 12mm.
Comparative example 1
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, mix is mixed
250kg cement, 150kg flyash, 600kg rubble, 50kg semi-hydrated gypsum and 80kg silicon powder are carried out mix, stirred by solidifying soil paste material
35min is mixed, 8kg water-reducing agent and 110kg water is added, after stirring 8min, 40kg ammonium chloride and 15kg barium hydroxide is added, stirs
50min is mixed, obtains cracking resistance after 30kg polypropylene fibre, 13kg silane coupling agent and 70kg calcium oxide stirring 25min is then added
Self-repair concrete.
Comparative example 2
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, in raw material
85kg is added in calcium oxide.
Comparative example 3
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, mix is mixed
250kg cement, 150kg flyash, 600kg rubble, 50kg semi-hydrated gypsum and 80kg silicon powder are carried out mix, stirred by solidifying soil paste material
35min is mixed, 8kg water-reducing agent and 110kg water is added, stirs 50min, it is silane coupled that 30kg polypropylene fibre, 13kg is then added
Cracking resistance self-repair concrete is obtained after agent stirring 25min.
Comparative example 4
A kind of preparation method of cracking resistance self-repair concrete is carried out according to method in embodiment 1, the difference is that, glass fibers
The length for tieing up pipe is 15mm.
Performance detection
To standard curing 7d and 28d compression strength, the crack original width of cracking resistance self-repair concrete obtained in embodiment 1-9
And the compression strength conserved again after cracking to 7d and 28d, measurement result are as shown in table 1 below.
| 7d compression strength (MPa) | 28d compression strength (MPa) | Crack original width (mm) | It conserves after cracking to 7d compression strength (MPa) | It conserves after cracking to 28d compression strength (MPa) | |
| Embodiment 1 | 38.9 | 65.2 | 0.10 | 37.9 | 63.2 |
| Embodiment 2 | 36.5 | 63.4 | 0.15 | 36.0 | 61.3 |
| Embodiment 3 | 35.4 | 60.7 | 0.15 | 34.2 | 58.9 |
| Embodiment 4 | 34.5 | 62.5 | 0.20 | 33.9 | 60.5 |
| Embodiment 5 | 35.2 | 61.8 | 0.20 | 34.8 | 60.8 |
| Embodiment 6 | 34.5 | 63.5 | 0.15 | 33.8 | 62.1 |
| Embodiment 7 | 36.2 | 62.9 | 0.15 | 35.4 | 60.9 |
| Embodiment 8 | 37.8 | 65.3 | 0.10 | 36.7 | 64.2 |
| Embodiment 9 | 38.2 | 64.7 | 0.10 | 37.9 | 63.7 |
| Embodiment 10 | 38.5 | 64.8 | 0.10 | 36.8 | 63.5 |
| Embodiment 11 | 38.4 | 65.0 | 0.10 | 36.9 | 63.4 |
| Embodiment 12 | 36.8 | 64.6 | 0.10 | 35.7 | 63.1 |
| Embodiment 13 | 33.4 | 58.9 | 0.10 | 30.9 | 56.7 |
| Comparative example 1 | 28.8 | 51.8 | 0.30 | 25.6 | 46.7 |
| Comparative example 2 | 35.1 | 61.3 | 0.20 | 24.6 | 48.7 |
| Comparative example 3 | 34.6 | 63.5 | 0.35 | 28.4 | 60.8 |
| Comparative example 4 | 30.7 | 56.4 | 0.20 | 25.9 | 58.9 |
It can be seen from Table 1 that the cracking resistance self-repair concrete being prepared through the invention has stronger compression strength, and
And its crack original width is smaller, and it can be observed that crack has been repaired after 8-12h after self-repair concrete cracking, substantially
It not can be appreciated that crack, and carry out the measurement of compression strength after maintenance 7d and 28d to it again respectively, it can be seen that compression strength is only
There is a small amount of reduction, also there is preferable compression strength.
It can be seen that directly mixing calcium oxide in concrete from comparative example 1, cracking resistance self-repair concrete pressure resistance
Degree reduces, and its incipient crack is larger, and it can be observed that there are also small cracks at crack after 1d, for crack autogenous healing energy
Power reduces；Find out in comparative example 2, calcium oxide additional amount is excessively high, then compression strength is weaker after concrete cracking selfreparing；Comparative example
3 and embodiment 1 in it can be seen that raw material in ammonium chloride, barium hydroxide and calcium oxide is not added, then its incipient crack is larger, and
Wider crack is clearly seen after 2d, self-repairing of concrete cracks performance is weak；As can be seen that fiberglass pipe in comparative example 4
Too long, then the compression strength of its cracking resistance self-repair concrete obtained is relatively low, and its incipient crack is also wider, too short, then
Operation more difficult for the sealed envelope of calcium oxide.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (9)
1. a kind of cracking resistance self-repair concrete, which is characterized in that including being made of raw material from the following weight: 200-300 parts of water
Mud, 100-180 part flyash, 500-700 parts of rubbles, 80-140 parts of water, 40-60 parts of semi-hydrated gypsums, 50-100 parts of silicon powders, 20-
40 parts of polypropylene fibres, 10-15 parts of silane coupling agents, 60-80 parts of calcium oxide, 5-10 parts of water-reducing agents, 30-50 parts of ammonium chlorides, 10-
20 parts of barium hydroxides；The calcium oxide sealing is loaded on use in fiberglass pipe.
2. a kind of cracking resistance self-repair concrete according to claim 1, which is characterized in that 230-280 parts of cement, 130-
160 parts of flyash, 550-650 parts of rubbles, 100-120 parts of water, 45-55 parts of semi-hydrated gypsums, 70-80 parts of silicon powders, 25-35 parts poly- third
Alkene fiber, 12-14 part silane coupling agent, 65-75 parts of calcium oxide, 6-8 parts of water-reducing agents, 35-45 parts of ammonium chlorides, eight water of 12-18 part
Barium hydroxide；The calcium oxide sealing is loaded on use in fiberglass pipe.
3. a kind of cracking resistance self-repair concrete according to claim 1, which is characterized in that the cracking resistance self-repair concrete
Including being made of raw material from the following weight: 250 parts of cement, 150 parts of flyash, 600 parts of rubbles, 110 parts of water, 50 part of half water stone
Cream, 80 parts of silicon powders, 30 parts of polypropylene fibres, 12 parts of silane coupling agents, 70 parts of calcium oxide, 8 parts of water-reducing agents, 40 parts of ammonium chlorides, 15
Part barium hydroxide；The calcium oxide sealing is loaded on use in fiberglass pipe.
4. a kind of cracking resistance self-repair concrete according to claim 1, which is characterized in that the cement includes that mass ratio is
The Portland pozzolana cement and portland slag cement of 1:1-2.
5. a kind of cracking resistance self-repair concrete according to claim 1, which is characterized in that the flyash is FI grades of fine coal
Ash；The rubble is the rubble for the continuous size fraction that partial size is 5-20mm.
6. a kind of cracking resistance self-repair concrete according to claim 1, which is characterized in that the water-reducing agent subtracts for polycarboxylic acids
Aqua or sodium lignin sulfonate or both are mixed with arbitrary proportion.
7. a kind of cracking resistance self-repair concrete according to claim 1, which is characterized in that the polypropylene fibre length is
12-16mm；The silicon powder partial size is 0.1-0.2 μm.
8. a kind of preparation method of cracking resistance self-repair concrete as claimed in claim 1, which is characterized in that including with
Lower step:
Cement, flyash, rubble, semi-hydrated gypsum and silicon powder are carried out mix, stir 30-40min, add by mixed concrete slurry
Enter water-reducing agent and water, after stirring 5-10min, ammonium chloride and barium hydroxide is added, stirs 40-60min, is then added poly- third
Concrete slurry is obtained after alkene fiber and silane coupling agent stirring 20-30min；
Calcium oxide sealing is loaded in fiberglass pipe, then the fiberglass pipe mix of calcium oxide will be housed in concrete slurry
In, obtain cracking resistance self-repair concrete.
9. a kind of preparation method of cracking resistance self-repair concrete according to claim 8, which is characterized in that the glass fibers
The length for tieing up pipe is 8-12mm.
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| CN112341098A (en) * | 2020-11-23 | 2021-02-09 | 北京天地建设砼制品有限公司 | High-strength commercial concrete and preparation method thereof |
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| CN115594434A (en) * | 2022-11-08 | 2023-01-13 | 深圳大学（Cn） | Difunctional artificial aggregate and preparation method and application thereof |
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