CN115159889B - Additive for concrete and preparation method and application thereof - Google Patents

Additive for concrete and preparation method and application thereof Download PDF

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CN115159889B
CN115159889B CN202210716034.5A CN202210716034A CN115159889B CN 115159889 B CN115159889 B CN 115159889B CN 202210716034 A CN202210716034 A CN 202210716034A CN 115159889 B CN115159889 B CN 115159889B
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cement
concrete
admixture
deoxyribonucleic acid
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CN115159889A (en
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蒋林华
张静辉
靳卫准
杨国辉
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Hohai University HHU
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

The invention discloses an admixture for concrete, a preparation method and application thereof, wherein the admixture comprises a deoxyribonucleic acid solution and a citrus polyphenol solution, and the admixture comprises the following components in percentage by mass: 20-25% of deoxynucleic acid solution and 75-80% of citrus polyphenol solution. The admixture of the concrete can be adsorbed on the surface of cement clinker particles to prevent water from contacting cement to generate hydration reaction, and can be adsorbed on the surface of hydration product C-S-H gel to inhibit the growth of the C-S-H gel, thereby reducing the hydration heat release rate of cement. And can produce complexation with free calcium ions in the solution, reduce the concentration of the free calcium ions in the solution and delay Ca (OH) 2 The formation of supersaturated solution delays the hydration of cement and reduces the heat release rate of the hydration of cement, so that the internal temperature gradient of concrete can be reduced, the temperature stress is reduced, and the risk of thermal cracks generated by the concrete is further reduced.

Description

Additive for concrete and preparation method and application thereof
Technical Field
The invention relates to the field of building material concrete additives, in particular to a concrete additive, a preparation method and application thereof.
Background
With the rapid development of civil engineering infrastructure construction, demands for large buildings (high-rise buildings, ports, dams, large bridges, etc.) are increasing, and the application of mass concrete in civil engineering construction is becoming more common. However, the problem of temperature cracking in mass concrete construction has been a critical issue. Because the section size of the mass concrete is larger and the heat conductivity is poor, a large amount of hydration heat in the pouring process cannot be quickly released to the outside of the structure, the temperature difference between the inside and outside of the structure is larger after the concrete is poured, the structure generates larger temperature stress, the temperature stress happens to be generated in the early stage of concrete solidification, and the temperature stress is extremely easy to exceed the ultimate strength of the concrete, so that the mass concrete structure is cracked in the early stage.
For the above reasons, in view of the problem of mass concrete temperature cracks, there is a need for an additive for reducing the hydration heat release rate of cement to reduce the internal temperature gradient of concrete and reduce the temperature stress, thereby reducing the risk of thermal cracks generated in concrete.
Disclosure of Invention
The invention aims to: the invention aims to provide a concrete additive which is nontoxic, biological and environment-friendly, has a simple preparation process and can reduce the hydration heat release rate of cement; another object of the invention is to provide a method for preparing an admixture for concrete; it is a further object of the present invention to provide the use of an admixture for concrete to reduce the rate of heat release from cement hydration.
The technical scheme is as follows: the invention relates to an admixture for concrete, which comprises a deoxyribonucleic acid solution and a citrus polyphenol solution, wherein the admixture comprises the following components in percentage by mass: 20-25% of deoxynucleic acid solution and 75-80% of citrus polyphenol solution; the concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
Further, the structure of the deoxyribonucleic acid is a single-chain structure.
Further, the deoxyribonucleic acid is a deoxyribonucleic acid with a length of 20-80 bases.
Further, deoxyribonucleic acid is composed of four bases including guanine, thymine, adenine, cytosine in order, which have a specific base sequence or a mixture of base sequences.
On the other hand, the preparation method of the admixture for concrete of the invention comprises the following steps:
(1) Taking deoxyribonucleic acid as a solute, centrifuging to gather the deoxyribonucleic acid to the bottom of a tube, and adding a proper amount of solvent water to fully dissolve the deoxyribonucleic acid to obtain a deoxyribonucleic acid solution;
(2) Adding the citrus polyphenol into the aqueous solution, uniformly stirring, and standing to obtain a citrus polyphenol solution;
(3) And (3) mixing the deoxyribonucleic acid solution obtained in the step (1) with the citrus polyphenol solution obtained in the step (2) to obtain the additive.
Further, in the step (1), the centrifugation is performed for 1 minute or more at a rotational speed of 3000 to 4000 rpm.
Further, in the step (1), the concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
Further, in the step (3), the deoxyribonucleic acid solution and the citrus polyphenol solution are mixed according to the following mass percentages: 20-25% of deoxynucleic acid solution and 75-80% of citrus polyphenol solution.
In another aspect, the invention provides the use of an admixture for concrete as described above for reducing the rate of heat release from cement hydration.
Further, the method of application is to mix the admixture with cement and incorporate it into the concrete. The doping amount of the additive in the cement is 2-8%; preferably 4 to 8%.
The additive of the invention utilizes the synergistic effect of tandem repeat phosphate on the deoxyribonucleic acid skeleton and phenolic hydroxyl groups of citrus polyphenol to increase the negative charge on the surface of the tandem repeat phosphate, enhance the adsorption of additive molecules on the surface of cement clinker particles, inhibit the growth of hydration product C-S-H gel to delay the hydration of cement, thereby reducing the hydration heat release rate of cement. The effect of the deoxyribonucleic acid is mainly to provide phosphate radical, and the aim of the invention can be achieved as long as the phosphate radical can be provided no matter what base sequence the deoxyribonucleic acid is. In addition, the tandem repeat phosphate radical on the DNA skeleton and the phenolic hydroxyl radical of the citrus polyphenol can be mutually adsorbed under the action of static electricity to generate complexation with free calcium ions in the solution, so that the concentration of the free calcium ions in the solution is reduced and Ca (OH) is delayed 2 The supersaturated solution is formed to delay the hydration of the cement, so that the heat release rate of the hydration of the cement is reduced, the internal temperature gradient of the concrete is reduced, the temperature stress is reduced, and the risk of generating hot cracks of the concrete is further reduced.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages: the preparation method is nontoxic, biological and environment-friendly, simple in process and convenient to operate.
Drawings
FIG. 1 is a graph showing the evaluation results of the heat release rate of hydration of cement by the admixture prepared in examples 1 to 3 and comparative example 1;
FIG. 2 shows the evaluation results of the heat release rate of cement hydration by the admixture prepared in examples 4 to 6 and comparative example 1.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Example 1
The admixture of the embodiment is formed by uniformly mixing deoxyribonucleic acid and an aqueous solution of citrus polyphenol, and the components are prepared as follows in percentage by mass: 20% of deoxynucleic acid solution and 80% of citrus polyphenol solution. The concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
The additive is prepared by the following method: and (3) taking deoxyribonucleic acid as a solute, centrifuging for 1 min at the rotating speed of 3000-4000 rpm, gathering the deoxyribonucleic acid to the bottom of the tube, adding a proper amount of solvent water, covering the tube cover, and rotating, vibrating and uniformly mixing, and standing for 30 min-1 h until the deoxyribonucleic acid is fully dissolved. Meanwhile, the citrus polyphenol is added into the aqueous solution, stirred uniformly and stood for 20 minutes. And finally, uniformly mixing the deoxyribonucleic acid solution and the citrus polyphenol solution according to a proportion.
Taking 0.2g of the additive solution prepared according to the scheme, adding the additive solution into 2.8g of water, uniformly mixing, adding the additive solution into 10g of cement, continuously stirring by an electric stirrer at the stirring rate of 100-250r/min, and finally testing the hydration rate of the cement by using a TAM-AIR isothermal calorimeter of America TA company at the testing temperature of 20 ℃, wherein the tested object is cement paste, and the water-cement ratio is 0.3.
Example 2
The admixture of the embodiment is formed by uniformly mixing deoxyribonucleic acid and an aqueous solution of citrus polyphenol, and the components are prepared as follows in percentage by mass: 20% of deoxynucleic acid solution and 80% of citrus polyphenol solution. The concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
The same preparation method as in example 1 was used to prepare the admixture.
Taking 0.4g of the additive solution prepared according to the scheme, adding the additive solution into 2.6g of water, uniformly mixing, adding the additive solution into 10g of cement, continuously stirring by an electric stirrer at the stirring rate of 100-250r/min, and finally testing the hydration rate of the cement by using a TAM-AIR isothermal calorimeter of America TA company at the testing temperature of 20 ℃, wherein the tested object is cement paste, and the water-cement ratio is 0.3.
Example 3
The admixture of the embodiment is formed by uniformly mixing deoxyribonucleic acid and an aqueous solution of citrus polyphenol, and the components are prepared as follows in percentage by mass: 20% of deoxynucleic acid solution and 80% of citrus polyphenol solution. The concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
The same preparation method as in example 1 was used to prepare the admixture.
Taking 0.8g of the additive solution prepared according to the scheme, adding 2.2g of water to mix uniformly, adding the additive solution into 10g of cement, continuously stirring by an electric stirrer at a stirring rate of 100-250r/min, and finally testing the hydration rate of the cement by using a TAM-AIR isothermal calorimeter of America TA company at a testing temperature of 20 ℃, wherein the tested object is cement paste and the water-cement ratio is 0.3.
Example 4
The admixture of the embodiment is formed by uniformly mixing deoxyribonucleic acid and an aqueous solution of citrus polyphenol, and the components are prepared as follows in percentage by mass: 25% of deoxynucleic acid solution and 75% of citrus polyphenol solution. The concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
The same preparation method as in example 1 was used to prepare the admixture.
Taking 0.2g of the additive solution prepared according to the scheme, adding the additive solution into 2.8g of water, uniformly mixing, adding the additive solution into 10g of cement, continuously stirring by an electric stirrer at the stirring rate of 100-250r/min, and finally testing the hydration rate of the cement by using a TAM-AIR isothermal calorimeter of America TA company at the testing temperature of 20 ℃, wherein the tested object is cement paste, and the water-cement ratio is 0.3.
Example 5
The admixture of the embodiment is formed by uniformly mixing deoxyribonucleic acid and an aqueous solution of citrus polyphenol, and the components are prepared as follows in percentage by mass: 25% of deoxynucleic acid solution and 75% of citrus polyphenol solution. The concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
The same preparation method as in example 1 was used to prepare the admixture.
Taking 0.4g of the additive solution prepared according to the scheme, adding the additive solution into 2.6g of water, uniformly mixing, adding the additive solution into 10g of cement, continuously stirring by an electric stirrer at the stirring rate of 100-250r/min, and finally testing the hydration rate of the cement by using a TAM-AIR isothermal calorimeter of America TA company at the testing temperature of 20 ℃, wherein the tested object is cement paste, and the water-cement ratio is 0.3.
Example 6
The admixture of the embodiment is formed by uniformly mixing deoxyribonucleic acid and an aqueous solution of citrus polyphenol, and the components are prepared as follows in percentage by mass: 25% of deoxynucleic acid solution and 75% of citrus polyphenol solution. The concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
The same preparation method as in example 1 was used to prepare the admixture.
Taking 0.8g of the additive solution prepared according to the scheme, adding 2.2g of water to mix uniformly, adding the additive solution into 10g of cement, continuously stirring by an electric stirrer at a stirring rate of 100-250r/min, and finally testing the hydration rate of the cement by using a TAM-AIR isothermal calorimeter of America TA company at a testing temperature of 20 ℃, wherein the tested object is cement paste and the water-cement ratio is 0.3.
Comparative example 1
Adding 3g of water into 10g of cement, continuously stirring by an electric stirrer at a stirring speed of 100-250r/min, and finally testing the hydration speed of the cement by using a TAM-AIR isothermal calorimeter of the American TA company at 20 ℃, wherein the tested object is cement paste, and the water-cement ratio is 0.3.
Examples 1 to 6 were tested for their effect on peak cement hydration heat rate and concrete properties and the results are shown in Table 1.
TABLE 1 influence of examples 1 to 6 on the peak Cement hydration heat rate and concrete Properties
Figure BDA0003709519410000041
Figure BDA0003709519410000051
As can be seen from Table 1, the peak of the heat release rate of cement hydration gradually decreases with the increase of the admixture. When the mass percentage of the additive is as follows: when the deoxynucleic acid solution is 20% and the citrus polyphenol solution is 80%, the mixing amount of the additive is 2%, 4% and 8%, and the peak values of the hydration heat release rate of the cement without the additive are reduced by 4.38%, 8.12% and 10.09%, respectively. The mass percentage of the additive is as follows: when the deoxynucleic acid solution is 25% and the citrus polyphenol solution is 75%, the mixing amount of the additive is 2%, 4% and 8%, and the peak values of the hydration heat release rate of the cement without the additive are reduced by 5.43%, 8.58% and 11.12%, respectively. Therefore, the additive has obvious inhibition effect on the peak value of the hydration heat release rate of cement, and the inhibition effect is increased along with the increase of the doping amount of the additive.
As can be seen from table 1, when the mass percentages of the admixture are: when the deoxynucleic acid solution is 20% and the citrus polyphenol solution is 80%, the additive amount is 2%, 4% and 8%, and the additive amount is 2%, 4% and 8%, respectively, the reduction of the compressive strength of the cement paste is 4.91%, 2.90% and 7.83% compared with the cement paste of 3 days without the additive. The mass percentage of the additive is as follows: when the deoxynucleic acid solution is 25% and the citrus polyphenol solution is 75%, the mixing amount of the additive is 2%, 4% and 8%, and the reduction of the compressive strength of the cement paste is 4.55%, 9.01% and 10.34% respectively compared with the 3-day cement paste without the additive. It can be seen that the incorporation of the admixture reduces the compressive strength of the 3 day cement paste.
When the mass percentage of the additive is as follows: when the deoxynucleic acid solution is 20% and the citrus polyphenol solution is 80%, the admixture dosage is 2%, 4% and 8%, and compared with the 28-day cement paste compressive strength without the admixture, the admixture dosage is respectively increased by 0.56%, increased by 2.71% and reduced by 2.65%. The mass percentage of the additive is as follows: when the deoxynucleic acid solution is 25% and the citrus polyphenol solution is 75%, the admixture dosage is 2%, 4% and 8%, and compared with the 28-day cement paste compressive strength without admixture, the admixture dosage is respectively increased by 2.74%, increased by 0.33% and reduced by 4.50%. Therefore, when the admixture is 2% and 4% mixed, the compressive strength of the cement paste for 28 days is increased, and when the admixture is 8% mixed, the compressive strength of the cement paste for 28 days is reduced.
While only the preferred embodiments of the present invention have been described, it should be noted that modifications and variations can be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (7)

1. The additive for the concrete is characterized by comprising a deoxyribonucleic acid solution and a citrus polyphenol solution, wherein the components are as follows in percentage by mass: 20-25% of deoxyribonucleic acid solution and 75-80% of citrus polyphenol solution; the concentration of the deoxyribonucleic acid solution is 615mg/L, and the concentration of the citrus polyphenol solution is 4g/L.
2. The admixture for concrete according to claim 1, wherein the structure of deoxyribonucleic acid is a single-stranded structure.
3. The admixture for concrete according to claim 1, wherein the deoxyribonucleic acid is 20 to 80 bases in length.
4. A method for preparing an admixture for concrete according to any one of claims 1 to 3, comprising the steps of:
(1) Taking deoxyribonucleic acid as a solute, centrifuging to gather the deoxyribonucleic acid to the bottom of a tube, and adding a proper amount of solvent water to fully dissolve the deoxyribonucleic acid to obtain a deoxyribonucleic acid solution;
(2) Adding the citrus polyphenol into the aqueous solution, uniformly stirring, and standing to obtain a citrus polyphenol solution;
(3) And (3) mixing the deoxyribonucleic acid solution obtained in the step (1) with the citrus polyphenol solution obtained in the step (2) to obtain the additive.
5. The method of producing a concrete admixture according to claim 4, wherein in the step (1), the centrifugation is carried out for 1 minute or more at a rotational speed of 3000 to 4000 rpm.
6. Use of an admixture according to any one of claims 1-3 for reducing the rate of heat release of cement hydration.
7. The use according to claim 6, wherein the use is by mixing the admixture with cement and incorporating it into the concrete.
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US3615780A (en) * 1969-05-28 1971-10-26 Itt Rayonier Inc Silicate-catalyzed chemical grouting compositions
US7575628B2 (en) * 2005-03-25 2009-08-18 Innovative Bioceramix, Inc. Hydraulic cement compositions and methods of making and using the same
CN107032654A (en) * 2016-11-15 2017-08-11 河海大学 A kind of biotinylated nucleic acid corrosion inhibitor and preparation method and application
CN107827384B (en) * 2017-11-09 2020-08-25 河海大学 Additive for improving crack resistance of cement-based material and preparation method and application thereof
CN112125561B (en) * 2020-09-18 2021-11-02 河海大学 Cement-based material heat regulation retarder based on plant pollen extracting solution, preparation method and application

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