CN110078448A - A kind of cracking resistance early strength concrete and preparation method thereof - Google Patents
A kind of cracking resistance early strength concrete and preparation method thereof Download PDFInfo
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- CN110078448A CN110078448A CN201910404040.5A CN201910404040A CN110078448A CN 110078448 A CN110078448 A CN 110078448A CN 201910404040 A CN201910404040 A CN 201910404040A CN 110078448 A CN110078448 A CN 110078448A
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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
- C04B28/02—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
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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
- C04B2111/00008—Obtaining or using nanotechnology related 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
- 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
- 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 & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of cracking resistance early strength concretes and preparation method thereof, which is made of raw material from the following weight: 460-475 parts of cement, 60-65 parts of miberal powder, 512-527 parts of sand, 1252-1288 parts of rubble, cellulose -5-10 parts of silica composite nano materials, 2-5 parts of calcium sulfate crystal whiskers, 4.1-4.9 parts of Early-strength polycarboxylate superplasticizer, 175-180 parts of water.Not only condensation setting rate is fast, early strength is high for concrete produced by the present invention, early epistasis energy is good, but also later period compression strength is high, while being not susceptible to cracking, generating crack, has excellent working performance and durability.
Description
Technical field
The present invention relates to building material technical fields more particularly to a kind of cracking resistance early strength concrete and preparation method thereof.
Background technique
With the fast development that national economy and highway infrastructures are built, maintenance and the management of highway increasingly have
Importance.In recent years, the vehicular load of highway is increasing, and travel speed is getting faster, and pavement damage is on the rise.According to
Normal concrete repairs road surface, can be only achieved some strength for a long time since normal concrete needs to conserve, the coagulation newly repaired
If soil surface is come into operation in a short time, it is broken to be easy cracking again, it is difficult to adapt to the allegro requirement of highway.It is early
Reinforced concrete refers to the concrete that setting time is short, early strength is big, uses the road early strength concrete Neng Shi in highway repairing field
Face reaches the required intensity that is open to traffic in advance, so as to shorten curing time, accelerates construction progress, runs road in advance, has
High Social benefit and economic benefit.Therefore, developing early strength concrete technology becomes a research side being concerned at present
To.
Currently, early strength concrete is usually that additive is added in portland cement concrete, such as early strength agent, early-strength diminishing
Agent etc. is prepared.That there are dosages is not easy to control due to traditional early strength agent, is easy to cause working performance of concrete and durable
Property reduce the problems such as, the emphasis for being developed into current research of new hardening accelerator.CN103979886A discloses one kind and mixes nanometer
Early strong high performance concrete of silicon-dioxide powdery and preparation method thereof, is applied to concrete material for nano silica powder
In, concrete Early-age behavior can be increased substantially.But nano silica is almost difficult since partial size is too small in system
In uniformly scatter, usually all in the form of aggregate exist, on the one hand limit its early strength function, another aspect aggregate
It is present in concrete, adverse effect is generated to the later strength of concrete.In addition, early strength concrete is due to gain in strength speed
Fastly, concrete shrinkage is relatively large, is easy to happen cracking, this also constrains the popularization and use of early strength concrete.
Summary of the invention
The object of the invention is to remedy the disadvantages of known techniques, provides a kind of cracking resistance early strength concrete and its preparation side
Method, not only condensation setting rate is fast, early strength is high for concrete obtained, early epistasis energy is good, but also later period compression strength is high,
It is not susceptible to cracking simultaneously, generates crack, there is excellent working performance and durability.
The present invention is achieved by the following technical solutions:
A kind of cracking resistance early strength concrete, is made of raw material from the following weight:
460-475 parts of cement, 60-65 parts of miberal powder, 512-527 parts of sand, 1252-1288 parts of rubble, cellulose-titanium dioxide
5-10 parts of silicon composite nano materials, 2-5 parts of calcium sulfate crystal whiskers, 4.1-4.9 parts of Early-strength polycarboxylate superplasticizer, 175-180 parts of water.
Preferably, the apparent density of the sand is 2580-2590kg/m3。
Preferably, the apparent density of the rubble is 2600-2700kg/m3。
Preferably, the cellulose-silica composite nano materials are made of raw material from the following weight: nanofiber
4-5 parts plain, 30-40 parts of ethyl orthosilicate, 30-40 parts of dehydrated alcohol, 80-100 parts of water, appropriate ammonium hydroxide.
Preferably, the cellulose-silica composite nano materials the preparation method is as follows:
(1) nano-cellulose is added to the water first ultrasonic disperse 5-10min, then high-pressure homogeneous 10-15min, is received
Rice cellulosic suspensions；
(2) it is added in the nano-cellulose suspension after mixing ethyl orthosilicate, dehydrated alcohol in 60-70 DEG C of stirring 1-
Then pH is adjusted to 9-10 with ammonium hydroxide by 2h, after 80-90 DEG C of standing 12-24h, drying to obtain the final product.
Preferably, the power of the ultrasonic disperse is 500-1000W, and the high-pressure homogeneous pressure is 50-100MPa.
Preferably, the average length of the calcium sulfate crystal whiskers is 50-200 μm.
A kind of preparation method of cracking resistance early strength concrete, includes the following steps:
(1) raw material is weighed by weight, is first carried out being acidified-ultrasound pretreatment for miberal powder, then be mixed with calcium sulfate crystal whiskers, ball
Mill uniformly, obtains calcium sulfate crystal whiskers doping miberal powder；
(2) cellulose-silica composite nano materials are added to the water and are uniformly dispersed, obtain cellulose-silica
Dispersion liquid；
(3) sand, rubble, the calcium sulfate crystal whiskers doping miberal powder, the cellulose-titanium dioxide are sequentially added into cement
Silicon dispersion liquid and Early-strength polycarboxylate superplasticizer and stir evenly to get.
Preferably, pretreated specific step is as follows for the acidification-ultrasound: first by miberal powder by weight 1:(1-2) with it is dense
The concentrated sulfuric acid that degree is 95-98% is uniformly mixed, and is then ultrasonically treated 1-2h, mistake under conditions of ultrasonic power is 200-500W
Filter is washed to neutrality, is finally dried.
Preferably, the ball milling condition is as follows: ratio of grinding media to material is (1-2): 1, rotational speed of ball-mill 100-200rpm, time 4-
8h。
The invention has the advantages that
(1) present invention makes nanometer by sol-gel method In-site generating nano-silicon dioxide particle on nano-cellulose
Silicon dioxide granule uniformly combines on nano-cellulose, to form cellulose-silica composite nano materials, a side
Face is added into concrete, can promote uniformly dispersed and compatibility of the nano silica in concrete system, right
Its it is early it is potent answer and concrete strength has facilitation effect, on the other hand, nano-cellulose can form net in concrete system
Network structure, and hole filling effect is played, be conducive to the later period compression strength and cracking resistance that improve concrete；
(2) present invention acidification first is carried out to miberal powder with the concentrated sulfuric acid, be then sonicated, then with the common ball of calcium sulfate crystal whiskers
Mill, is entrained in calcium sulfate crystal whiskers equably in miberal powder, by chemi-excitation, the excitation of mechanical excitation and calcium sulfate crystal whiskers exciting agent
Effect combines, and by collaboration complex excitation effect, the hydraulically active of miberal powder is greatly improved, promotes it that water faster occurs
Change, helps to improve its early strength；Meanwhile calcium sulfate crystal whiskers are uniformly distributed in concrete can play strengthening and toughening, are filled
Closely knit effect reduces the contraction fissure of concrete, improves the cracking resistance of concrete, and calcium sulfate crystal whiskers and miberal powder is compound
Effect helps to improve the later period compression strength of concrete.
In conclusion not only condensation setting rate is fast, early strength is high, early epistasis energy for concrete produced by the present invention
It is good, and later period compression strength is high, while being not susceptible to cracking, generating crack, has excellent working performance and durability.
Specific embodiment
Technical solution of the present invention is further described combined with specific embodiments below.
Primary raw material concrete specification and producer involved in embodiment are as shown in the table:
Embodiment 1
A kind of cracking resistance early strength concrete, is made of raw material from the following weight:
460 parts of cement, 60 parts of miberal powder, 512 parts of sand, 1252 parts of rubble, cellulose-silica composite nano materials 5
Part, 2 parts of the calcium sulfate crystal whiskers that average length is 50 μm, 4.1 parts of Early-strength polycarboxylate superplasticizer, 175 parts of water.
Wherein, the apparent density of sand is 2580kg/m3, the apparent density of rubble is 2600kg/m3。
Cellulose-silica composite nano materials are made of raw material from the following weight: 4 parts of nano-cellulose, positive silicon
30 parts of acetoacetic ester, 30 parts of dehydrated alcohol, 80 parts of water, appropriate ammonium hydroxide, preparation method are as follows:
(1) nano-cellulose is added to the water prior to ultrasonic disperse 10min under 500W power, then under 50MPa pressure
High-pressure homogeneous 15min obtains nano-cellulose suspension；
(2) it is added in the nano-cellulose suspension in 60 DEG C of stirring 2h, so after mixing ethyl orthosilicate, dehydrated alcohol
PH is adjusted to 9 with ammonium hydroxide afterwards, is stood in 80 DEG C for 24 hours, after drying to obtain the final product.
The preparation method of cracking resistance early strength concrete includes the following steps:
(1) raw material is weighed by weight, first will first be mixed miberal powder with the concentrated sulfuric acid that concentration is 95% by weight 1:1
It is even, it then is ultrasonically treated 2h under conditions of ultrasonic power is 200W, is filtered, washing to neutrality is brilliant with calcium sulfate after dry
It must mix, the ball milling 8h under the conditions of ratio of grinding media to material is 1:1, rotational speed of ball-mill is 100rpm, obtain calcium sulfate crystal whiskers doping miberal powder；
(2) cellulose-silica composite nano materials are added to the water and are uniformly dispersed, obtain cellulose-silica
Dispersion liquid；
(3) sand, rubble, the calcium sulfate crystal whiskers doping miberal powder, the cellulose-titanium dioxide are sequentially added into cement
Silicon dispersion liquid and Early-strength polycarboxylate superplasticizer and stir evenly to get.
Embodiment 2
A kind of cracking resistance early strength concrete, is made of raw material from the following weight:
469 parts of cement, 62 parts of miberal powder, 518 parts of sand, 1264 parts of rubble, cellulose-silica composite nano materials 7
Part, 3 parts of the calcium sulfate crystal whiskers that average length is 100 μm, 4.6 parts of Early-strength polycarboxylate superplasticizer, 178 parts of water.
Wherein, the apparent density of sand is 2585kg/m3, the apparent density of rubble is 2680kg/m3。
Cellulose-silica composite nano materials are made of raw material from the following weight: 4.5 parts of nano-cellulose, just
35 parts of silester, 35 parts of dehydrated alcohol, 90 parts of water, appropriate ammonium hydroxide, preparation method are as follows:
(1) nano-cellulose is added to the water under power 800W first ultrasonic disperse 6min, it is then high under 80MPa pressure
Homogeneous 12min is pressed, nano-cellulose suspension is obtained；
(2) it is added in the nano-cellulose suspension after mixing ethyl orthosilicate, dehydrated alcohol in 65 DEG C of stirring 1.5h,
Then pH is adjusted to 9.5 with ammonium hydroxide, after 85 DEG C of standing 18h, drying to obtain the final product.
The preparation method of cracking resistance early strength concrete includes the following steps:
(1) raw material is weighed by weight, is first uniformly mixed miberal powder with the concentrated sulfuric acid that concentration is 96% by weight 1:1.5,
Then be ultrasonically treated 1.5h under conditions of ultrasonic power is 300W, filter, washing to neutrality, it is dry after with calcium sulfate crystal whiskers
Mixing, the ball milling 6h under the conditions of ratio of grinding media to material is 1.5:1, rotational speed of ball-mill is 150rpm obtain calcium sulfate crystal whiskers doping miberal powder；
(2) cellulose-silica composite nano materials are added to the water and are uniformly dispersed, obtain cellulose-silica
Dispersion liquid；
(3) sand, rubble, the calcium sulfate crystal whiskers doping miberal powder, the cellulose-titanium dioxide are sequentially added into cement
Silicon dispersion liquid and Early-strength polycarboxylate superplasticizer and stir evenly to get.
Embodiment 3
A kind of cracking resistance early strength concrete, is made of raw material from the following weight:
475 parts of cement, 65 parts of miberal powder, 527 parts of sand, 1288 parts of rubble, cellulose-silica composite nano materials 10
Part, 5 parts of the calcium sulfate crystal whiskers that average length is 200 μm, 4.9 parts of Early-strength polycarboxylate superplasticizer, 180 parts of water.
Wherein, the apparent density of sand is 2590kg/m3, the apparent density of rubble is 2700kg/m3。
Cellulose-silica composite nano materials are made of raw material from the following weight: 5 parts of nano-cellulose, positive silicon
40 parts of acetoacetic ester, 40 parts of dehydrated alcohol, 100 parts of water, appropriate ammonium hydroxide, the preparation method is as follows:
(1) nano-cellulose is added to the water under power 1000W first ultrasonic disperse 5min, then under 100MPa pressure
High-pressure homogeneous 10min obtains nano-cellulose suspension；
(2) it is added in the nano-cellulose suspension in 70 DEG C of stirring 1h, so after mixing ethyl orthosilicate, dehydrated alcohol
PH is adjusted to 10 with ammonium hydroxide afterwards, after 90 DEG C of standing 12h, drying to obtain the final product.
The preparation method of cracking resistance early strength concrete includes the following steps:
(1) raw material is weighed by weight, is first uniformly mixed miberal powder with the concentrated sulfuric acid that concentration is 98% by weight 1:2, so
It is ultrasonically treated 1h under conditions of ultrasonic power is 500W afterwards, is filtered, washing to neutrality is mixed with calcium sulfate crystal whiskers after dry
It closes, the ball milling 4h under the conditions of ratio of grinding media to material is 2:1, rotational speed of ball-mill is 200rpm, obtains calcium sulfate crystal whiskers doping miberal powder；
(2) cellulose-silica composite nano materials are added to the water and are uniformly dispersed, obtain cellulose-silica
Dispersion liquid；
(3) sand, rubble, the calcium sulfate crystal whiskers doping miberal powder, the cellulose-titanium dioxide are sequentially added into cement
Silicon dispersion liquid and Early-strength polycarboxylate superplasticizer and stir evenly to get.
Comparative example 1
Concrete in this example is made of raw material from the following weight:
470 parts of cement, 63 parts of miberal powder, 520 parts of sand, 1270 parts of rubble, 4.5 parts of Early-strength polycarboxylate superplasticizer, water 178
Part.
Wherein, the apparent density of sand is 2585kg/m3, the apparent density of rubble is 2650kg/m3。
Preparation method is as follows:
Raw material is weighed by weight, and sand, rubble, miberal powder and Early-strength polycarboxylate superplasticizer are sequentially added into cement and is stirred
Mix uniformly to get.
By concrete made from above-described embodiment 1-3 and comparative example 1 according to " normal concrete mechanical test method
Standard GB/T50081-2002 ", " Standard for test methods of properties of ordinary concrete mixture standard (GB/T50080-2002) " progressive
It can test, as a result as shown in the table:
Claims (10)
1. a kind of cracking resistance early strength concrete, which is characterized in that be made of raw material from the following weight:
460-475 parts of cement, 60-65 parts of miberal powder, 512-527 parts of sand, 1252-1288 parts of rubble, cellulose-silica are multiple
Close nano material 5-10 parts, 2-5 parts of calcium sulfate crystal whiskers, 4.1-4.9 parts of Early-strength polycarboxylate superplasticizer, 175-180 parts of water.
2. a kind of cracking resistance early strength concrete according to claim 1, which is characterized in that the apparent density of the sand is
2580-2590kg/m3。
3. a kind of cracking resistance early strength concrete according to claim 1, which is characterized in that the apparent density of the rubble is
2600-2700kg/m3。
4. a kind of cracking resistance early strength concrete according to claim 1, which is characterized in that the cellulose-silica is multiple
It closes nano material to be made of raw material from the following weight: 4-5 parts of nano-cellulose, 30-40 parts of ethyl orthosilicate, dehydrated alcohol
30-40 parts, 80-100 parts of water, appropriate ammonium hydroxide.
5. a kind of cracking resistance early strength concrete according to claim 4, which is characterized in that the cellulose-silica is multiple
Close nano material the preparation method is as follows:
(1) nano-cellulose is added to the water first ultrasonic disperse 5-10min, then high-pressure homogeneous 10-15min, obtains Nanowire
Tie up plain suspension；
(2) it is added in the nano-cellulose suspension after mixing ethyl orthosilicate, dehydrated alcohol in 60-70 DEG C of stirring 1-2h,
Then pH is adjusted to 9-10 with ammonium hydroxide, after 80-90 DEG C of standing 12-24h, drying to obtain the final product.
6. a kind of cracking resistance early strength concrete according to claim 5, which is characterized in that the power of the ultrasonic disperse is
500-1000W, the high-pressure homogeneous pressure are 50-100MPa.
7. a kind of cracking resistance early strength concrete according to claim 1, which is characterized in that the average length of the calcium sulfate crystal whiskers
Degree is 50-200 μm.
8. a kind of preparation method of cracking resistance early strength concrete according to claim 1, which is characterized in that including following steps
It is rapid:
(1) raw material is weighed by weight, is first carried out being acidified-ultrasound pretreatment for miberal powder, then be mixed with calcium sulfate crystal whiskers, ball milling is equal
It is even, obtain calcium sulfate crystal whiskers doping miberal powder；
(2) cellulose-silica composite nano materials are added to the water and are uniformly dispersed, obtain cellulose-silica dispersion
Liquid；
(3) sand, rubble, calcium sulfate crystal whiskers doping miberal powder, the cellulose-silica point are sequentially added into cement
Dispersion liquid and Early-strength polycarboxylate superplasticizer and stir evenly to get.
9. a kind of preparation method of cracking resistance early strength concrete according to claim 8, which is characterized in that the acidification-is super
Specific step is as follows for sound preconditioning: first by miberal powder by weight 1:(1-2) it is mixed with the concentrated sulfuric acid that concentration is 95-98%
It is even, it then is ultrasonically treated 1-2h under conditions of ultrasonic power is 200-500W, is filtered, washs to neutrality, finally dries.
10. a kind of preparation method of cracking resistance early strength concrete according to claim 8, which is characterized in that the ball milling item
Part is as follows: ratio of grinding media to material is (1-2): 1, rotational speed of ball-mill 100-200rpm, time 4-8h.
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| CN112745092A (en) * | 2021-01-08 | 2021-05-04 | 江苏立浩建材科技有限公司 | Nano plasticized self-compacting anti-cracking concrete |
| CN113087475A (en) * | 2021-04-25 | 2021-07-09 | 中化学交通建设集团市政工程有限公司 | Preparation method of anti-cracking early-strength concrete for pipe gallery |
| CN113636793A (en) * | 2021-08-10 | 2021-11-12 | 成都精准混凝土有限公司 | Recycled concrete and preparation method thereof |
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| CN114804709A (en) * | 2022-05-23 | 2022-07-29 | 广西科达建材化工有限公司 | Novel early strength agent of nano calcium silicate hydrate polycarboxylic acid and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN110078448B (en) | 2021-07-30 |
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