CN110078448B - Anti-cracking early-strength concrete and preparation method thereof - Google Patents

Anti-cracking early-strength concrete and preparation method thereof Download PDF

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CN110078448B
CN110078448B CN201910404040.5A CN201910404040A CN110078448B CN 110078448 B CN110078448 B CN 110078448B CN 201910404040 A CN201910404040 A CN 201910404040A CN 110078448 B CN110078448 B CN 110078448B
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cellulose
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姚献义
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Ningbo Xili Concrete Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00008Obtaining or using nanotechnology related materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • C04B2111/343Crack resistant materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, 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 anti-cracking early strength concrete and a preparation method thereof, wherein the concrete is prepared from the following raw materials in parts by weight: 460-475 parts of cement, 60-65 parts of mineral powder, 512-527 parts of sand, 1252 parts of gravel, 1288 parts of cellulose-silicon dioxide composite nano material, 2-5 parts of calcium sulfate whisker, 4.1-4.9 parts of early strength type polycarboxylic acid water reducing agent and 180 parts of water 175-doped material. The concrete prepared by the invention has the advantages of high setting and hardening speed, high early strength, good early strength performance, high later compressive strength, difficult cracking and crack generation, and excellent working performance and durability.

Description

Anti-cracking early-strength concrete and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to anti-cracking early-strength concrete and a preparation method thereof.
Background
With the rapid development of national economy and highway infrastructure construction, the maintenance and management of highways are more and more important. In recent years, the vehicle load on the road is getting larger and faster, and the damage to the road surface is getting worse. If the common concrete is adopted to repair the pavement, the newly repaired concrete pavement is easy to crack and break again if being put into use in a short time because the common concrete needs to be maintained for a long time to reach certain strength, and is difficult to adapt to the use requirement of the highway on fast pace. The early-strength concrete is concrete with short setting time and high early strength, and can be used in the field of highway repair to enable the pavement to reach the strength required by traffic in advance, so that the maintenance time is shortened, the construction progress is accelerated, the road is operated in advance, and the early-strength concrete has extremely high social benefit and economic benefit. Therefore, the development of early strength concrete technology is a research direction which is currently receiving much attention.
At present, the early strength concrete is usually prepared by adding additives, such as an early strength agent, an early strength water reducing agent and the like, into ordinary cement concrete. Because the traditional early strength agent has the problems that the dosage is not easy to control, the working performance and durability of concrete are easy to reduce and the like, the development of a novel early strength agent becomes the key point of the current research. CN103979886A discloses a high-performance early-strength concrete doped with nano-silica powder and a preparation method thereof, wherein the nano-silica powder is applied to a concrete material, so that the early-performance of the concrete can be greatly improved. However, the nano-silica is too small in particle size to be uniformly dispersed in the system, and is generally present in the form of aggregates, which limits the early strength of the nano-silica, and adversely affects the later strength of the concrete due to the presence of the aggregates in the concrete. In addition, the early strength concrete has a high strength increase speed, relatively large concrete shrinkage and easy cracking, so that the popularization and the use of the early strength concrete are restricted.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides the anti-cracking early-strength concrete and the preparation method thereof, and the prepared concrete has the advantages of high setting and hardening speed, high early strength, good early strength performance, high later-stage compressive strength, difficult cracking and crack generation, and excellent working performance and durability.
The invention is realized by the following technical scheme:
the anti-cracking early-strength concrete is prepared from the following raw materials in parts by weight:
460-475 parts of cement, 60-65 parts of mineral powder, 512-527 parts of sand, 1252 parts of gravel, 1288 parts of cellulose-silicon dioxide composite nano material, 2-5 parts of calcium sulfate whisker, 4.1-4.9 parts of early strength type polycarboxylic acid water reducing agent and 180 parts of water 175-doped material.
Preferably, the apparent density of the sand is 2580-2590kg/m3
Preferably, the apparent density of the crushed stone is 2600-3
Preferably, the cellulose-silica composite nano-material is prepared from the following raw materials in parts by weight: 4-5 parts of nano-cellulose, 30-40 parts of ethyl orthosilicate, 30-40 parts of absolute ethyl alcohol, 80-100 parts of water and a proper amount of ammonia water.
Preferably, the preparation method of the cellulose-silica composite nanomaterial comprises the following steps:
(1) adding nano-cellulose into water, performing ultrasonic dispersion for 5-10min, and then homogenizing under high pressure for 10-15min to obtain nano-cellulose suspension;
(2) mixing ethyl orthosilicate and absolute ethyl alcohol, adding the mixture into the nano cellulose suspension, stirring the mixture for 1 to 2 hours at the temperature of between 60 and 70 ℃, adjusting the pH value to be between 9 and 10 by using ammonia water, standing the mixture for 12 to 24 hours at the temperature of between 80 and 90 ℃, and drying the mixture to obtain the nano cellulose.
Preferably, the power of the ultrasonic dispersion is 500-1000W, and the pressure of the high-pressure homogenization is 50-100 MPa.
Preferably, the average length of the calcium sulfate whiskers is 50-200 μm.
A preparation method of crack-resistant early-strength concrete comprises the following steps:
(1) weighing the raw materials according to the weight, firstly carrying out acidification-ultrasonic pretreatment on the mineral powder, then mixing the mineral powder with the calcium sulfate whisker, and uniformly ball-milling to obtain calcium sulfate whisker doped mineral powder;
(2) adding the cellulose-silicon dioxide composite nano material into water to be uniformly dispersed to obtain cellulose-silicon dioxide dispersion liquid;
(3) and sequentially adding sand, broken stone, the calcium sulfate whisker doped mineral powder, the cellulose-silicon dioxide dispersion liquid and the early-strength polycarboxylate superplasticizer into the cement, and uniformly stirring to obtain the cement.
Preferably, the specific steps of the acidification-ultrasonic pretreatment are as follows: firstly, mixing mineral powder according to the weight ratio of 1: (1-2) mixing with concentrated sulfuric acid with the concentration of 95-98%, then carrying out ultrasonic treatment for 1-2h under the condition that the ultrasonic power is 200-500W, filtering, washing to be neutral, and finally drying.
Preferably, the ball milling conditions are as follows: the ball material ratio is (1-2): 1, the ball milling speed is 100 and 200rpm, and the time is 4-8 h.
The invention has the advantages that:
(1) according to the invention, nano-silica particles are generated on nano-cellulose in situ by a sol-gel method, so that the nano-silica particles are uniformly combined on the nano-cellulose to form a cellulose-silica composite nano-material, on one hand, the nano-silica composite nano-material is added into concrete, can promote uniform dispersibility and compatibility of nano-silica in a concrete system, and has a promoting effect on an early strength effect and concrete strength, on the other hand, the nano-cellulose can form a network structure in the concrete system, plays a role in filling pores, and is beneficial to improving the later-stage compressive strength and crack resistance of the concrete;
(2) the mineral powder is firstly acidified by concentrated sulfuric acid, then is subjected to ultrasonic treatment, and is subjected to ball milling together with calcium sulfate whiskers, so that the calcium sulfate whiskers are uniformly doped in the mineral powder, the chemical excitation, the mechanical excitation and the excitation of a calcium sulfate whisker excitant are combined, and the hydraulic activity of the mineral powder is greatly improved through the synergistic composite excitation, so that the mineral powder is promoted to be hydrated more quickly, and the early strength of the mineral powder is improved; meanwhile, the calcium sulfate whiskers are uniformly distributed in the concrete, so that the effects of reinforcing, toughening and dense filling can be achieved, the shrinkage cracks of the concrete are reduced, the crack resistance of the concrete is improved, and the composite effect of the calcium sulfate whiskers and the mineral powder is beneficial to improving the later-stage compressive strength of the concrete.
In conclusion, the concrete prepared by the invention has the advantages of high setting and hardening speed, high early strength, good early strength performance, high later-stage compressive strength, difficult cracking and cracking, and excellent working performance and durability.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific examples.
The specific specifications and manufacturers of the main raw materials involved in the examples are shown in the following table:
Figure BDA0002060649800000041
Figure BDA0002060649800000051
example 1
The anti-cracking early-strength concrete is prepared from the following raw materials in parts by weight:
460 parts of cement, 60 parts of mineral powder, 512 parts of sand, 1252 parts of gravel, 5 parts of cellulose-silicon dioxide composite nano material, 2 parts of calcium sulfate whisker with the average length of 50 mu m, 4.1 parts of early strength polycarboxylate superplasticizer and 175 parts of water.
Wherein the apparent density of the sand is 2580kg/m3The apparent density of the crushed stone is 2600kg/m3
The cellulose-silicon dioxide composite nano material is prepared from the following raw materials in parts by weight: 4 parts of nano-cellulose, 30 parts of tetraethoxysilane, 30 parts of absolute ethyl alcohol, 80 parts of water and a proper amount of ammonia water, and the preparation method comprises the following steps:
(1) adding nano-cellulose into water, performing ultrasonic dispersion for 10min under the power of 500W, and then homogenizing for 15min under the pressure of 50MPa to obtain nano-cellulose suspension;
(2) mixing tetraethoxysilane and absolute ethyl alcohol, adding the mixture into the nano cellulose suspension, stirring the mixture for 2 hours at the temperature of 60 ℃, then adjusting the pH to 9 by using ammonia water, standing the mixture for 24 hours at the temperature of 80 ℃, and drying the mixture to obtain the nano cellulose.
The preparation method of the anti-crack early-strength concrete comprises the following steps:
(1) weighing the raw materials according to the weight ratio of the mineral powder to 1: 1 and concentrated sulfuric acid with the concentration of 95 percent are uniformly mixed, then ultrasonic treatment is carried out for 2 hours under the condition that the ultrasonic power is 200W, filtration and washing are carried out until the mixture is neutral, the mixture is mixed with calcium sulfate whiskers after drying, and then the mixture is mixed according to the ball material ratio of 1: 1. ball milling is carried out for 8 hours under the condition that the ball milling rotating speed is 100rpm, and calcium sulfate whisker doped mineral powder is obtained;
(2) adding the cellulose-silicon dioxide composite nano material into water to be uniformly dispersed to obtain cellulose-silicon dioxide dispersion liquid;
(3) and sequentially adding sand, broken stone, the calcium sulfate whisker doped mineral powder, the cellulose-silicon dioxide dispersion liquid and the early-strength polycarboxylate superplasticizer into the cement, and uniformly stirring to obtain the cement.
Example 2
The anti-cracking early-strength concrete is prepared from the following raw materials in parts by weight:
469 parts of cement, 62 parts of mineral powder, 518 parts of sand, 1264 parts of broken stone, 7 parts of cellulose-silicon dioxide composite nano material, 3 parts of calcium sulfate whisker with the average length of 100 mu m, 4.6 parts of early strength polycarboxylate superplasticizer and 178 parts of water.
Wherein the apparent density of the sand is 2585kg/m3The apparent density of the crushed stone is 2680kg/m3
The cellulose-silicon dioxide composite nano material is prepared from the following raw materials in parts by weight: 4.5 parts of nano-cellulose, 35 parts of ethyl orthosilicate, 35 parts of absolute ethyl alcohol, 90 parts of water and a proper amount of ammonia water, and the preparation method comprises the following steps:
(1) adding nano-cellulose into water, firstly performing ultrasonic dispersion for 6min under the power of 800W, and then homogenizing for 12min under the pressure of 80MPa to obtain nano-cellulose suspension;
(2) mixing tetraethoxysilane and absolute ethyl alcohol, adding the mixture into the nano cellulose suspension, stirring the mixture for 1.5h at 65 ℃, then adjusting the pH to 9.5 by using ammonia water, standing the mixture for 18h at 85 ℃, and drying the mixture to obtain the nano cellulose.
The preparation method of the anti-crack early-strength concrete comprises the following steps:
(1) weighing the raw materials according to the weight ratio of the mineral powder to 1: 1.5, uniformly mixing with concentrated sulfuric acid with the concentration of 96%, then carrying out ultrasonic treatment for 1.5h under the condition that the ultrasonic power is 300W, filtering, washing to be neutral, drying, mixing with calcium sulfate whiskers, and adding a mixture of calcium sulfate whiskers according to a ball-to-material ratio of 1.5: 1. ball milling for 6h at the ball milling rotating speed of 150rpm to obtain calcium sulfate whisker doped mineral powder;
(2) adding the cellulose-silicon dioxide composite nano material into water to be uniformly dispersed to obtain cellulose-silicon dioxide dispersion liquid;
(3) and sequentially adding sand, broken stone, the calcium sulfate whisker doped mineral powder, the cellulose-silicon dioxide dispersion liquid and the early-strength polycarboxylate superplasticizer into the cement, and uniformly stirring to obtain the cement.
Example 3
The anti-cracking early-strength concrete is prepared from the following raw materials in parts by weight:
475 parts of cement, 65 parts of mineral powder, 527 parts of sand, 1288 parts of broken stone, 10 parts of cellulose-silicon dioxide composite nano material, 5 parts of calcium sulfate whisker with the average length of 200 mu m, 4.9 parts of early strength polycarboxylate superplasticizer and 180 parts of water.
Wherein the apparent density of the sand is 2590kg/m3The apparent density of the crushed stone is 2700kg/m3
The cellulose-silicon dioxide composite nano material is prepared from the following raw materials in parts by weight: 5 parts of nano-cellulose, 40 parts of tetraethoxysilane, 40 parts of absolute ethyl alcohol, 100 parts of water and a proper amount of ammonia water, and the preparation method comprises the following steps:
(1) adding nano-cellulose into water, firstly performing ultrasonic dispersion for 5min under the power of 1000W, and then homogenizing for 10min under the pressure of 100MPa to obtain nano-cellulose suspension;
(2) mixing tetraethoxysilane and absolute ethyl alcohol, adding the mixture into the nano cellulose suspension, stirring the mixture for 1h at 70 ℃, then adjusting the pH to 10 by using ammonia water, standing the mixture for 12h at 90 ℃, and drying the mixture to obtain the nano cellulose.
The preparation method of the anti-crack early-strength concrete comprises the following steps:
(1) weighing the raw materials according to the weight ratio of the mineral powder to 1: 2, uniformly mixing with concentrated sulfuric acid with the concentration of 98%, then carrying out ultrasonic treatment for 1h under the condition that the ultrasonic power is 500W, filtering, washing to be neutral, drying, mixing with calcium sulfate whiskers, and adding a mixture in a ball-material ratio of 2: 1. ball milling for 4 hours at the ball milling rotating speed of 200rpm to obtain calcium sulfate whisker doped mineral powder;
(2) adding the cellulose-silicon dioxide composite nano material into water to be uniformly dispersed to obtain cellulose-silicon dioxide dispersion liquid;
(3) and sequentially adding sand, broken stone, the calcium sulfate whisker doped mineral powder, the cellulose-silicon dioxide dispersion liquid and the early-strength polycarboxylate superplasticizer into the cement, and uniformly stirring to obtain the cement.
Comparative example 1
The concrete in the embodiment is prepared from the following raw materials in parts by weight:
470 parts of cement, 63 parts of mineral powder, 520 parts of sand, 1270 parts of gravel, 4.5 parts of early-strength polycarboxylate superplasticizer and 178 parts of water.
Wherein the apparent density of the sand is 2585kg/m3The apparent density of the crushed stone is 2650kg/m3
The preparation method comprises the following steps:
weighing the raw materials according to the weight, sequentially adding the sand, the broken stone, the mineral powder and the early-strength polycarboxylate superplasticizer into the cement, and uniformly stirring to obtain the cement.
The concrete prepared in the above examples 1 to 3 and comparative example 1 was subjected to a performance test in accordance with general concrete mechanical property test method Standard GB/T50081-2002 and general concrete mixture Performance test method Standard GB/T50080-2002, and the results are shown in the following table:
Figure BDA0002060649800000091

Claims (7)

1. the anti-cracking early-strength concrete is characterized by being prepared from the following raw materials in parts by weight:
460-475 parts of cement, 60-65 parts of mineral powder, 512-527 parts of sand, 1252 parts of gravel, 1288 parts of cellulose-silicon dioxide composite nano material, 2-5 parts of calcium sulfate whisker, 4.1-4.9 parts of early strength type polycarboxylic acid water reducing agent and 180 parts of water 175;
the cellulose-silicon dioxide composite nano material is prepared from the following raw materials in parts by weight: 4-5 parts of nano-cellulose, 30-40 parts of ethyl orthosilicate, 30-40 parts of absolute ethyl alcohol, 80-100 parts of water and a proper amount of ammonia water;
the preparation method of the cellulose-silicon dioxide composite nano material comprises the following steps:
(1) adding nano-cellulose into water, performing ultrasonic dispersion for 5-10min, and then homogenizing under high pressure for 10-15min to obtain nano-cellulose suspension;
(2) mixing ethyl orthosilicate and absolute ethyl alcohol, adding the mixture into the nano cellulose suspension, stirring the mixture for 1 to 2 hours at the temperature of between 60 and 70 ℃, adjusting the pH value to be between 9 and 10 by using ammonia water, standing the mixture for 12 to 24 hours at the temperature of between 80 and 90 ℃, and drying the mixture to obtain the nano cellulose suspension;
the power of the ultrasonic dispersion is 500-1000W, and the pressure of the high-pressure homogenization is 50-100 MPa.
2. The crack-resistant early strength concrete according to claim 1, wherein the apparent density of the sand is 2580-2590kg/m3
3. The crack-resistant early strength concrete according to claim 1, wherein the apparent density of said crushed stone is 2600-3
4. The crack-resistant early strength concrete according to claim 1, wherein the calcium sulfate whiskers have an average length of 50-200 μm.
5. The method for preparing the crack-resistant early-strength concrete according to claim 1, characterized by comprising the following steps:
(1) weighing the raw materials according to the weight, firstly carrying out acidification-ultrasonic pretreatment on the mineral powder, then mixing the mineral powder with the calcium sulfate whisker, and uniformly ball-milling to obtain calcium sulfate whisker doped mineral powder;
(2) adding the cellulose-silicon dioxide composite nano material into water to be uniformly dispersed to obtain cellulose-silicon dioxide dispersion liquid;
(3) and sequentially adding sand, broken stone, the calcium sulfate whisker doped mineral powder, the cellulose-silicon dioxide dispersion liquid and the early-strength polycarboxylate superplasticizer into the cement, and uniformly stirring to obtain the cement.
6. The method for preparing the crack-resistant early-strength concrete according to claim 5, wherein the concrete steps of the acidification-ultrasonic pretreatment are as follows: firstly, mixing mineral powder according to the weight ratio of 1: (1-2) mixing with concentrated sulfuric acid with the concentration of 95-98%, then carrying out ultrasonic treatment for 1-2h under the condition that the ultrasonic power is 200-500W, filtering, washing to be neutral, and finally drying.
7. The method for preparing the crack-resistant early-strength concrete according to claim 5, wherein the ball milling conditions are as follows: the ball material ratio is (1-2): 1, the ball milling speed is 100 and 200rpm, and the time is 4-8 h.
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