Carbonation-resistant material with reduced cement content and method for producing the same

Abstract

The application relates to the field of building materials, and particularly discloses an anti-carbonization material capable of reducing the cement consumption and a preparation method thereof. Raw materials of the anti-carbonization material include the following components in percentage by mass: the balance is water; the anti-carbonization material is a nano material with a crystal nucleus and a porous reticular structure on the surface. The application not only makes the concrete have good anti-carbonization effect, but also has the same compressive strength as the benchmark group while reducing the cement consumption per cubic meter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building materials, more particularly, it relates to an anti-carbonation material capable of reducing the amount of cement and a preparation method thereof. BACKGROUND

[0002] Carbonation of concrete is due to the reaction of calcium hydroxide inside the concrete with carbon dioxide in the air or water. On the one hand, when the surface layer of the concrete carbonates, carbon dioxide will continue to diffuse to the inside of the concrete through the capillary pores, increasing the carbonation depth, when the concrete is completely carbonated, the texture of the concrete will become more loose, the strength will be greatly reduced, which will cause great danger to social safety and economy. On the other hand, when the concrete carbonates, the alkalinity inside the concrete decreases, and the decrease in alkalinity will damage the passivation film on the surface of the steel bar, increasing the risk of steel bar corrosion, and further shortening the service life of the concrete structure.

[0003] In addition, with the development of domestic subway, tunnel and underground engineering in recent years, it is found that carbon dioxide erosion in groundwater is a key factor affecting the durability of underground concrete structure. And in the project with a large water-binder ratio, the concrete has more internal pores and a more loose structure, and the depth of carbon dioxide intrusion into the concrete is deeper, which seriously damages the concrete structure. Therefore, it is crucial to develop an anti-carbonation material to inhibit carbonation in engineering.

[0004] Patent CN102432220B, a kind of anti-carbonization corrosion-resistant concrete and its preparation method and lining pipe piece, discloses a kind of cement, modified coal gangue, sand, fly ash, admixture, water, inorganic water-based cement penetration sealing waterproof agent and penetration type steel bar rust inhibitor are prepared as material anti-carbonization corrosion-resistant concrete.This application prolongs the long-term corrosion resistance of steel bar, while the inorganic water-based cement penetration sealing waterproof agent mixed can form water-insoluble gel, block the void and capillary channel of concrete, form dense waterproof layer, reduce water evaporation, reduce drying shrinkage, prevent the penetration of carbon dioxide, improve the carbonation resistance.But the phosphate used in the present application has obvious retarding effect, the internal mixing concrete can greatly reduce the compressive strength of concrete, and the preparation of penetration type steel bar rust inhibitor needs to be calcined at 400-450 DEG C for 4-5 h, the temperature is too high, the equipment requirement is higher, which is not conducive to production and application.Patent CN113929349A kind of organic silicon nano precursor medium transmission inhibitor and its preparation method and application, effectively solve the problem that hydrophobic material cannot reduce the diffusion of erosive medium in saturated state, through in-situ generation of nano materials, can effectively solve the problems of uneven dispersion and poor stability of external nano materials, effectively improve the ion erosion resistance of concrete.This application is mainly aimed at reducing the chloride ion diffusion coefficient and ion transmission, but it cannot effectively inhibit carbonization, and although it has little effect on the mechanical properties of concrete, it still has the same compressive strength as the benchmark group while reducing the amount of cement per cubic meter.CN102219555B, a kind of multifunctional concrete structure durability protective agent and its preparation and application method, uses inorganic / organic composite fluorosilicon propolymer, lithium silicate, sodium silicate, lithium molybdate, sodium tetraborate, sodium sulfate, benzene propyl triazole, nano titanium dioxide, anhydrous ethanol and water as raw materials to prepare the protective agent, which can penetrate into the interior of concrete, reduce internal pores and cracks, and improve the density of concrete.But the protective agent of this invention is used for mechanical spraying or manual coating on the surface of concrete, which is inconvenient to construct, and has poor permeability.Patent WO2014032203A1 discloses an anti-carbonization exterior wall protective agent and its preparation method, which uses organic silicon silane and siloxane nanomolecule mixture, alkane and alkene mixture, and de-aromatic solvent as materials to prepare the anti-carbonization exterior wall protective agent, which is mainly sprayed on existing concrete structure to solve the defects of water seepage, carbonization and substrate powdering caused by long-term exposure to atmospheric and rainwater environment in buildings.But the permeability is poor, the construction is inconvenient, and it is not suitable for new concrete structure.

[0005] Therefore, on the basis of good anti-carbonization effect, the anti-carbonization material which still has the same compressive strength as the benchmark group while reducing the amount of cement per cubic meter is a very promising and important topic. SUMMARY

[0006] The application provides an anti-carbonization material with reduced cement dosage and a preparation method thereof, which not only has good anti-carbonization effect, but also has the same compressive strength as a benchmark group while reducing the cement dosage per cubic meter, and is very convenient to prepare and construct.

[0007] In a first aspect, the application provides an anti-carbonization material with reduced cement dosage, which adopts the following technical solution:

[0008] An anti-carbonization material with reduced cement dosage, raw materials of the anti-carbonization material include the following components by mass percentage:

[0009] 0.1% to 5% of a saccharide compound;

[0010] 0.1% to 5% of a hydroxylamide;

[0011] 5% to 15% of a nanomaterial dispersion liquid;

[0012] 0.1% to 5% of an alcohol amine compound;

[0013] 1% to 10% of an organosilicon and a derivative thereof;

[0014] 0.1% to 5% of an emulsifier;

[0015] and the balance is water; the anti-carbonization material has a nanomaterial as a crystal nucleus and a porous network structure on the surface.

[0016] In the anti-carbonization material, the saccharide compound, the hydroxylamide, the alcohol amine compound, the organosilicon and the derivative thereof are used to modify the surface of the nanomaterial, and the anti-carbonization material has the nanomaterial as the crystal nucleus and the porous network structure on the surface. On one hand, the organosilicon and the derivative thereof gradually form an interlaced structure composed of Si-O-Si bonds in the concrete after modification, so that the concrete has good hydrophobic properties, the water absorption rate is reduced, and carbonization is inhibited. On the other hand, the surface of the modified anti-carbonization material has a porous network structure, which absorbs carbon dioxide together with the saccharide compound and the alcohol amine compound, and solidifies the carbon dioxide, further preventing carbonization. The hydroxylamide on the surface of the modified nanomaterial gradually hydrolyzes in the alkaline environment of the concrete, and the carboxylic acid after hydrolysis gradually forms calcium carboxylate and other compounds in situ with calcium ions in the concrete, further increasing the compactness of the concrete. In addition, the modified nanomaterial itself optimizes the pore structure of the concrete, improves the pore of the concrete, and further enhances the compactness of the concrete, so that the compressive strength is equivalent to that of the benchmark group while reducing the cement dosage per cubic meter by 5-10 kg, reducing the material cost, reducing the amount of cement used in the construction industry, and reducing the amount of carbon dioxide generated by cement.

[0017] Further, the particle size of the nanomaterial dispersion is 1-100 nm, and the solid content is 10-50%.

[0018] Further, the saccharide compound includes at least one of starch, glycogen, cellulose, sucrose, maltose, galactose, lactose, glucose, fructose.

[0019] Further, the chemical structure of the hydroxyl amide is shown as (1):

[0020]

[0021] Wherein, n=2-20, R1 is H, hydroxyl or alkyl with 1-30 carbon atoms, R2 is H, and R3 is methyl, ethyl, propyl, butyl or hydroxyethyl.

[0022] Further, the nanomaterial dispersion includes at least one of nanosilica dispersion, nanoaluminum nitride dispersion, nanocalcium carbonate dispersion, nanotitanium dioxide dispersion, nanomagnesium oxide dispersion, nanoaluminum oxide dispersion and nanozinc oxide dispersion.

[0023] Further, the alcohol amine compound includes at least one of N,N-dimethylethanolamine, N,N-diethylethanolamine, N,N-diethylpropanolamine, N-methyldiethanolamine, monoethanolamine, diethanolamine, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, monoethanol diisopropanolamine, 2-dibutylaminoethanol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol.

[0024] Further, the organosilicon and its derivatives include at least one of silicate, alkyl silicate, alkyl siloxane, alkenyl siloxane, polysiloxane.

[0025] Further, the emulsifier includes at least one of Tween 20, Tween 40, Tween 60, Tween 80, Tween 85, Span 20, Span 40, Span 60, Span 65, Span 80, Span 85, alkyl sulfonate, alkyl quaternary ammonium salt.

[0026] In the second aspect, the application provides a preparation method of a carbonation-resistant material capable of reducing the cement dosage.

[0027] The preparation method of the carbonation-resistant material capable of reducing the cement dosage includes the following steps:

[0028] (1) adding a saccharide compound, a hydroxyl amide and water into a reaction container, starting stirring, the temperature is 30-70℃, and stirring for 10-60 min;

[0029] (2) in step (1), the nano material and the alcohol amine compound are added in turn, the stirring speed is 100-1000 r / min, and the reaction time is 0.5-2 h;

[0030] (3) in step (2), the organic silicon and its derivatives and the emulsifier are added, the temperature is 20-80℃, the stirring speed is 100-2000 r / min, and the stirring time is 1-3 h, so as to obtain the anti-carbonization material capable of reducing the cement dosage.

[0031] By adopting the technical scheme, firstly, the nano material is taken as a crystal nucleus, the hydroxyl groups in the sugar compound and the hydroxyl amide can be combined with the surface of the nano material, the alcohol amine compound can further modify the nano material, then the organic silicon and its derivatives and the emulsifier continue to modify the nano material; after the anti-carbonization material is mixed into the concrete, the alcohol amine solution can also capture and absorb carbon dioxide, and the modified reticular nano material can also solidify the carbon dioxide transmission, so that the effect of efficiently inhibiting carbonization is finally achieved; and after the nano material with such a structure is added into the concrete, the cement dosage can be reduced while the compressive strength of the concrete can be maintained.

[0032] In summary, the application has the following beneficial effects:

[0033] (1) The anti-carbonization material of the application is a substance with a porous reticular structure on the surface and taking the nano material as a crystal nucleus, has good stability, and can be directly mixed into the concrete for use, so that the construction is simple and convenient; moreover, the anti-carbonization material can layer by layer inhibit the transmission of carbon dioxide, the hydrophobic performance of the concrete can inhibit the transmission of carbon dioxide, the modified nano material can further solidify the transmission of carbon dioxide, in addition, the pore structure of the concrete is optimized, the compactness of the concrete is improved, and carbonization is further inhibited; the problem of efficient inhibition of carbonization of the internal mixing type anti-carbonization material in the newly built concrete structure is solved, the service life of the concrete is prolonged, and the durability of the concrete structure is improved.

[0034] (2) The anti-carbonization material of the application can reduce the cement dosage of the same strength, reduce the material cost, reduce the use amount of cement in the construction industry, and reduce the amount of carbon dioxide generated due to cement; DETAILED DESCRIPTION

[0035] The application will be further described in detail below in combination with the embodiments.

[0036] Embodiment

[0037] The embodiment provides an anti-carbonization material capable of reducing the cement dosage, which comprises the following components:

[0038]

[0039] Further, the chemical structural formula of the hydroxyl amide is shown in (1) :

[0040]

[0041] wherein n = 2-20, R1 is H, hydroxyl or alkyl with 1-30 carbon atoms, R2 is H, and R3 is methyl, ethyl, propyl, butyl or hydroxyethyl.

[0042] Further, the sugar compound includes at least one of starch, glycogen, cellulose, sucrose, maltose, galactose, lactose, glucose, and fructose.

[0043] Further, the nanomaterial dispersion liquid includes at least one of nanosilica dispersion liquid, nanoaluminum nitride dispersion liquid, nanocalcium carbonate dispersion liquid, nanotitanium dioxide dispersion liquid, nanomagnesium oxide dispersion liquid, nanoaluminum oxide dispersion liquid, and nanozinc oxide dispersion liquid. The nanomaterial dispersion liquid has a particle size of 0.1-100 nm and a solid content of 10-50%.

[0044] Further, the alcohol amine compound includes at least one of N,N-dimethylethanolamine, N,N-diethylethanolamine, N,N-diethylpropanolamine, N-methyldiethanolamine, monoethanolamine, diethanolamine, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, monoethanol diisopropanolamine, 2-dibutylaminoethanol, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0045] Further, the organosilicon and derivatives thereof include at least one of silicate, alkyl silicate, alkyl siloxane, alkenyl siloxane, and polysiloxane.

[0046] Further, the emulsifier includes at least one of Tween 20, Tween 40, Tween 60, Tween 80, Tween 85, Span 20, Span 40, Span 60, Span 65, Span 80, Span 85, alkyl sulfonate, and alkyl quaternary ammonium salt.

[0047] The application also provides a preparation method of the anti-carbonation material with reduced cement dosage, including the following steps:

[0048] (1) adding a sugar compound, a hydroxyl amide, and water into a reaction container, and starting stirring at a temperature of 30-70°C for 10-60 min;

[0049] (2) sequentially adding a nanomaterial and an alcohol amine compound into the reaction container of step (1) at a stirring speed of 100-1000 r / min for 0.5-2 h;

[0050] (3) adding silicone and its derivatives and emulsifiers in step (2), the temperature is 20-80℃, the stirring speed is 100-2000r / min, and the stirring time is 1-3h, to obtain the carbonation-resistant material which can reduce the cement dosage.

[0051] The carbonation-resistant material prepared by the embodiment of the present application has a nano material as a crystal nucleus and a porous network structure on the surface.

[0052] The following is described by specific embodiments.

[0053] Embodiment 1

[0054] The embodiment provides a preparation method of a carbonation-resistant material which can reduce the cement dosage, and the method comprises the following steps:

[0055] (1) adding 5g of glucose and 0.5g of hydroxyl amide in a reaction container, wherein n is 2, R1 is an alkyl with 30 carbon atoms, R2 is H, and R3 is a methyl group; then adding 74.3g of water, starting stirring, and stirring for 30min at 30℃; then sequentially adding 10g of a nano-silicon dioxide dispersion liquid and 5g of diethanol monoisopropanol amine in the reaction container, and stirring at a speed of 100r / min for 2h;

[0056] (2) adding 5g of undecyl triethoxysilane, 0.1g of Tween 40 and 0.1g of cetyl trimethyl ammonium chloride in step (1), the temperature is 80℃, the stirring speed is 1000r / min, and the stirring time is 2h, to obtain the carbonation-resistant material which can reduce the cement dosage, and the carbonation-resistant material is recorded as M1.

[0057] Embodiment 2

[0058] The embodiment provides a preparation method of a carbonation-resistant material which can reduce the cement dosage, and the method comprises the following steps:

[0059] (1) adding 0.1g of starch and 1g of hydroxyl amide in a reaction container, wherein n is 5, R1 is an alkyl with 15 carbon atoms, R2 is H, and R3 is a butyl group; then adding 87.4g of water, starting stirring, and stirring for 60min at 70℃; then sequentially adding 5g of a nano-titanium dioxide dispersion liquid and 5g of N,N-dimethylethanolamine in the reaction container, and stirring at a speed of 500r / min for 1h;

[0060] (2) adding 1g of gamma-methacryloyloxypropyl trimethoxysilane, 0.2g of Span 80 and 0.3g of sodium dodecyl benzene sulfonate in step (1), the temperature is 80℃, the stirring speed is 2000r / min, and the stirring time is 3h, to obtain the carbonation-resistant material which can reduce the cement dosage, and the carbonation-resistant material is recorded as M2.

[0061] Example 3

[0062] The embodiment provides a preparation method of the carbonation-resistant material capable of reducing cement consumption, and the method comprises the following steps:

[0063] (1) 5g of sucrose and 0.1g of hydroxyl amide are added into a reaction container, wherein n is 10, R1 is an alkyl group with 10 carbon atoms, R2 is H, and R3 is ethyl. Then, 68.8g of water is added, and stirring is started, with the temperature being 50 DEG C and the stirring time being 40min. Then, 15g of nano-aluminum oxide dispersion liquid and 0.1g of 2-dibutylaminoethanol are sequentially added into the reaction container, with the stirring speed being 1000r / min and the reaction time being 2h.

[0064] (2) 10g of N-(2-aminoethyl)-3-aminopropylmethyldiethoxysilane, 0.4g of Tween 60 and 0.6g of octadecyl dimethyl trimethylsilyl propyl ammonium chloride are added into the step (1), with the temperature being 40 DEG C, the stirring speed being 1500r / min and the stirring time being 1h, so as to obtain the carbonation-resistant material capable of reducing cement consumption, and the carbonation-resistant material is marked as M3.

[0065] Example 4

[0066] The embodiment provides a preparation method of the carbonation-resistant material capable of reducing cement consumption, and the method comprises the following steps:

[0067] (1) 3g of maltose and 5g of hydroxyl amide are added into a reaction container, wherein n is 20, R1 is butyl, R2 is H, and R3 is methyl. Then, 70g of water is added, and stirring is started, with the temperature being 60 DEG C and the stirring time being 50min. Then, 10g of nano-silicon dioxide dispersion liquid and 3g of 2-amino-2-methyl-1,3-propanediol are sequentially added into the reaction container, with the stirring speed being 200r / min and the reaction time being 1h.

[0068] (2) 7g of polymethyl triethoxysilane, 0.6g of Tween 80 and 1.4g of undecyl hydroxyethyl imidazoline quaternary ammonium salt are added into the step (1), with the temperature being 70 DEG C, the stirring speed being 1000r / min and the stirring time being 2h, so as to obtain the carbonation-resistant material capable of reducing cement consumption, and the carbonation-resistant material is marked as M4.

[0069] Example 5

[0070] The embodiment provides a preparation method of the carbonation-resistant material capable of reducing cement consumption, and the method comprises the following steps:

[0071] (1) in the reaction container, 1 g of fructose and 5 g of hydroxyl amide were added, wherein n was 15, R1 was methyl, R2 was H, and R3 was hydroxyethyl. Then 73 g of water was added, stirring was started, the temperature was 40 DEG C, and stirring was performed for 10 min; then 5 g of nano titanium dioxide dispersion liquid and 5 g of N, N-diethylpropanolamine were sequentially added to the reaction container, the stirring speed was 100 r / min, and the reaction time was 0.5 h;

[0072] (2) in step (1), 10 g of octyl polymethylsiloxane, 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide were added, the temperature was 30 DEG C, the stirring speed was 500 r / min, and stirring was performed for 1 h to obtain the cement-reducing anti-carbonization material, which was recorded as M5.

[0073] Example 6

[0074] The embodiment provides a preparation method of a cement-reducing anti-carbonization material, which comprises the following steps:

[0075] (1) in the reaction container, 5 g of lactose and 3 g of hydroxyl amide were added, wherein n was 20, R1 was hydroxyl, R2 was H, and R3 was butyl. Then 60.5 g of water was added, stirring was started, the temperature was 60 DEG C, and stirring was performed for 60 min; then 15 g of nano calcium carbonate dispersion liquid and 5 g of N, N-diethylpropanolamine were sequentially added to the reaction container, the stirring speed was 500 r / min, and the reaction time was 2 h;

[0076] (2) in step (1), 10 g of isobutyl (alkenyl) triethoxysilane, 1 g of Tween 20 and 0.5 g of octadecyl dimethyl benzyl ammonium chloride were added, the temperature was 50 DEG C, the stirring speed was 1700 r / min, and stirring was performed for 2 h to obtain the cement-reducing anti-carbonization material, which was recorded as M6.

[0077] Comparative Example 1

[0078] The comparative example provides a preparation method of a cement-reducing anti-carbonization material, which comprises the following steps:

[0079] (1) in the reaction container, 1 g of fructose and 5 g of hydroxyl amide were added, wherein n was 15, R1 was methyl, R2 was H, and R3 was hydroxyethyl. Then 78 g of water was added, stirring was started, the temperature was 40 DEG C, and stirring was performed for 10 min; then 5 g of N, N-diethylpropanolamine was added to the reaction container, the stirring speed was 100 r / min, and the reaction time was 0.5 h;

[0080] (2) In step (1), 10 g of octylpolymethylsiloxane, 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide are added, the temperature is 30°C, the stirring speed is 500 r / min, and after stirring for 1 h, the cement-reducing anti-carbonization material is obtained, which is denoted as R1.

[0081] Comparative Example 2

[0082] The present comparative example provides a preparation method of a cement-reducing anti-carbonization material, comprising the following steps:

[0083] (1) 1 g of fructose and 78 g of water are added to a reaction container, stirring is started, the temperature is 40°C, and stirring is performed for 10 min; then 5 g of nano-titanium dioxide dispersion liquid and 5 g of N,N-diethylpropanolamine are sequentially added to the reaction container, the stirring speed is 100 r / min, and the reaction time is 0.5 h;

[0084] (2) In step (1), 10 g of octylpolymethylsiloxane, 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide are added, the temperature is 30°C, the stirring speed is 500 r / min, and after stirring for 1 h, the cement-reducing anti-carbonization material is obtained, which is denoted as R2.

[0085] Comparative Example 3

[0086] A preparation method of a cement-reducing anti-carbonization material, comprising the following steps:

[0087] 1 g of fructose and 5 g of hydroxyamide (wherein n is 15, R1 is methyl, R2 is H, and R3 is hydroxyethyl) are added to a reaction container, then 73 g of water, 5 g of nano-titanium dioxide dispersion liquid, 5 g of N,N-diethylpropanolamine, 10 g of octylpolymethylsiloxane, 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide are added, the reaction temperature is 30°C, and after stirring for 1 h, the cement-reducing anti-carbonization material is obtained, which is denoted as R3.

[0088] Comparative Example 4

[0089] A preparation method of a cement-reducing anti-carbonization material, comprising the following steps:

[0090] (1) 10 g of fructose and 10 g of hydroxyamide (wherein n is 15, R1 is methyl, R2 is H, and R3 is hydroxyethyl) are added to a reaction container, then 29 g of water is added, stirring is started, the temperature is 40°C, and stirring is performed for 10 min; then 25 g of nano-titanium dioxide dispersion liquid and 10 g of N,N-diethylpropanolamine are sequentially added to the reaction container, the stirring speed is 100 r / min, and the reaction time is 0.5 h;

[0091] (2) In step (1), 15 g of octylpolymethylsiloxane, 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide are added, the temperature is 30°C, the stirring speed is 500 r / min, and after stirring for 1 h, the cement-reducing anti-carbonization material is obtained, which is denoted as R4.

[0092] Comparative Example 5

[0093] A method for preparing a cement-reducing anti-carbonization material includes the following steps:

[0094] (1) 1 g of fructose and 5 g of hydroxylamide, wherein n is 15, R1 is methyl, R2 is H, and R3 is hydroxyethyl, are added to a reaction container, then 83 g of water is added, stirring is started, the temperature is 40°C, and stirring is performed for 10 min; then 5 g of nano-titanium dioxide dispersion liquid and 5 g of N,N-diethylpropanolamine are sequentially added to the reaction container, the stirring speed is 100 r / min, and the reaction time is 0.5 h;

[0095] (2) In step (1), 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide are added, the temperature is 30°C, the stirring speed is 500 r / min, and after stirring for 1 h, the cement-reducing anti-carbonization material is obtained, which is denoted as R5.

[0096] Comparative Example 6

[0097] A method for preparing a cement-reducing anti-carbonization material includes the following steps:

[0098] (1) 5 g of hydroxylamide, wherein n is 15, R1 is methyl, R2 is H, and R3 is hydroxyethyl, are added to a reaction container, then 74 g of water is added, stirring is started, the temperature is 40°C, and stirring is performed for 10 min; then 5 g of nano-titanium dioxide dispersion liquid and 5 g of N,N-diethylpropanolamine are sequentially added to the reaction container, the stirring speed is 100 r / min, and the reaction time is 0.5 h;

[0099] (2) In step (1), 10 g of octylpolymethylsiloxane, 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide are added, the temperature is 30°C, the stirring speed is 500 r / min, and after stirring for 1 h, the cement-reducing anti-carbonization material is obtained, which is denoted as R6.

[0100] Comparative Example 7

[0101] A method for preparing a cement-reducing anti-carbonization material includes the following steps:

[0102] (1) In the reaction vessel, 1 g of fructose and 5 g of hydroxyl amide were added, wherein n was 15, R1 was methyl, R2 was H, and R3 was hydroxyethyl. Then 78 g of water was added, stirring was started, the temperature was 40 DEG C, and stirring was performed for 10 min; then 5 g of nano titanium dioxide dispersion liquid was added in the reaction vessel in sequence, the stirring speed was 100 r / min, and the reaction time was 0.5 h;

[0103] (2) In step (1), 10 g of octyl polymethylsiloxane, 0.5 g of Span 40 and 0.5 g of cetyltrimethylammonium bromide were added, the temperature was 30 DEG C, the stirring speed was 500 r / min, and after stirring for 1 h, the anti-carbonization material capable of reducing the cement dosage was obtained, and the anti-carbonization material was recorded as R7.

[0104] Performance detection

[0105] (1) Stability: the stability of the anti-carbonization material was detected by centrifugation, a high-speed centrifuge was a TG16-WS produced by Changsha Xiangzhi Centrifuge Instrument Co., Ltd., the anti-carbonization material prepared above was sampled and placed in a test tube, then was symmetrically placed in a centrifuge, the centrifuge was covered, the speed was adjusted to 3500 r / min, the centrifugation time was 30 min, and after the centrifuge stopped, the layered condition of the material in the test tube was observed to judge the stability.

[0106] (2) Water absorption rate and hydrophobic property of concrete: the concrete mix proportion was designed and formed according to GB / T 50082 "Standard for Testing Long-term Performance and Durability of Ordinary Concrete", the W / C in the concrete was 0.35, the cement was Hailuo PO.42.5 Portland cement, the sand was river sand, the stone was basalt, the particle size range was 5-15 mm and 10-25 mm, the sand rate was 40%, the benchmark was not adding the anti-carbonization material, the dosage of the anti-carbonization material was 10% of the cementitious material mass fraction, and the contact angle and the water absorption rate after soaking for 30 min were tested after standard curing for 7 d.

[0107] (3) Compressive strength of concrete: the concrete was formed by using the above concrete mix proportion, the dosage of the anti-carbonization material was 10% of the cementitious material mass fraction, but the corresponding cement dosage was reduced. According to the compressive strength result, 5-10 kg of cement could be reduced per square meter of concrete by adding M1-M6 anti-carbonization material, and the compressive strength was basically equivalent to that of the blank group, which indicated that the anti-carbonization material had a good promotion effect on the compressive strength of the concrete. The compressive strength of R1 and R2 was obviously reduced, which also indicated that the stability of the product itself had an influence on the compressive strength, and the compressive strength of R1 at different ages was greater than that of R2, which also indicated that the nano material had a densification effect.

[0108] (4) Carbonization performance: the concrete test block is used to test the carbonization test method in GB / T 50082 "Standard Test Methods for Long-Term Performance and Durability of Ordinary Concrete", and the test piece is taken out and broken when carbonized to 28d. From the carbonization depth result, it can be seen that the carbonization depth is significantly reduced after adding M1-M6 carbonization resistant material, which shows that it has obvious inhibitory effect on carbonization. The carbonization depth of R1 is less than that of R2, which shows that the addition of nanomaterials can also reduce carbonization to a certain extent.

[0109] The above detection results are shown in Table 1

[0110] Table 1 Performance detection table of examples and comparative examples

[0111]

[0112]

[0113] From the detection results of the examples of the present application and the reference group, it is found that first, after adding the carbonization resistant material of the present application, not only the carbonization resistance of the concrete can be improved, but also the compressive strength can be maintained with the reference group under the condition of reducing the cement consumption per square by 5-10 kg. This is because for the carbonization resistant material of the present application, the nanomaterial is used as the crystal nucleus and the surface is a porous network structure, and the porous network structure on the surface is formed after the nanomaterial is surface modified by sugar compounds, hydroxy amide, alcohol amine compounds, organosilicon and its derivatives. The carbonization resistant material of the present application can well improve the compactness and hydrophobicity of the concrete, and can effectively adsorb carbon dioxide, improve the carbonization resistance, reduce the cement consumption per square by 5-10 kg, and the compressive strength is basically equivalent to that of the blank group.

[0114] Further, it is found from the performance of the comparative example 1 that the comparative example 1 does not use nanomaterials, and not only the carbonization resistance, hydrophobicity and stability are greatly reduced, but also the compressive strength is reduced after reducing the cement per square of concrete. Further combining the performance of comparative example 3, it is found that comparative example 3 has the same formula as example 5 and uses nanomaterials, but its performance is slightly better than that of comparative example 1, but still has a certain gap with the performance of the examples of the present application. This is because the preparation process of comparative example 3 cannot form the carbonization resistant material with nanomaterial as crystal nucleus and surface as porous network structure, so it cannot play the performance of the carbonization resistant material of the present application.

[0115] In addition, the comparative example 2 does not use hydroxyl amide, the comparative example 5 does not use silicone and its derivatives, the comparative example 6 does not use saccharide compound, the comparative example 7 does not use alcohol amine compound, and the performance of the concrete is reduced in different degrees, which shows that for the carbonation resistant material of the present application, the micro-nucleus of the nano-material is very important, and the porous network surface structure formed thereby is also very important; in addition, it is found by analyzing the comparative example 4 that the difference between the component amount of the comparative example 4 and the present application is relatively large, and finally the performance is reduced more, which shows that in order to realize the carbonation resistant material with nano-material as the crystal nucleus and the surface as the porous network structure, the amount of raw materials is also very important, otherwise the performance of the carbonation resistant material cannot be played.

[0116] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution according to the needs after reading the specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A carbonation-resistant material that can reduce cement usage, characterized in that, The raw materials for the anti-carbonation material include the following components by mass percentage: The remainder is water; the anti-carbonation material is based on nanomaterials as crystal nuclei and has a porous network structure on the surface.

2. The anti-carbonation material that reduces cement usage according to claim 1, characterized in that, The particle size of the nanomaterial dispersion is 1-100 nm, and the solid content is 10-50%.

3. The anti-carbonation material that reduces cement usage according to claim 1, characterized in that, The carbohydrate compounds include at least one of starch, glycogen, cellulose, sucrose, maltose, galactose, lactose, glucose, and fructose.

4. The anti-carbonation material that reduces cement usage according to claim 1, characterized in that, The chemical structural formula of the hydroxyamide is shown in (1): Wherein, n = 2 to 20, R1 is H, hydroxyl or alkyl with 1 to 30 C atoms, R2 is H, and R3 is methyl, ethyl, propyl, butyl or hydroxyethyl.

5. The anti-carbonation material that reduces cement usage according to claim 1, characterized in that, The nanomaterial dispersion includes at least one of nano silica dispersion, nano aluminum nitride dispersion, nano calcium carbonate dispersion, nano titanium dioxide dispersion, nano magnesium oxide dispersion, nano aluminum oxide dispersion, and nano zinc oxide dispersion.

6. The anti-carbonation material that reduces cement usage according to claim 1, characterized in that, The alkanolamine compounds include at least one of N,N-dimethylethanolamine, N,N-diethylethanolamine, N,N-diethylpropanolamine, N-methyldiethanolamine, monoethanolamine, diethanolamine, triethanolamine, diethanol monoisopropanolamine, triisopropanolamine, monoethanol diisopropanolamine, 2-dibutylaminoethanol, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

7. The anti-carbonation material that reduces cement usage according to claim 1, characterized in that, The organosilicones and their derivatives include at least one of silicates, alkyl silicates, alkylsiloxanes, alkenylsiloxanes, and polysiloxanes.

8. The anti-carbonation material that reduces cement usage according to claim 1, characterized in that, The emulsifier includes at least one of Tween 20, Tween 40, Tween 60, Tween 80, Tween 85, Span 20, Span 40, Span 60, Span 65, Span 80, Span 85, alkyl sulfonates, and alkyl quaternary ammonium salts.

9. A method for preparing an anti-carbonation material that reduces cement usage as described in any one of claims 1-8, characterized in that, Includes the following steps: (1) Add carbohydrates, hydroxyamides and water to the reaction vessel, start stirring, and stir for 10-60 minutes at a temperature of 30℃~70℃. (2) In step (1), nanomaterials and alcohol amine compounds are added sequentially, the stirring speed is 100-1000 r / min, and the reaction time is 0.5-2 h; (3) In step (2), add organosilicon and its derivatives and emulsifier, at a temperature of 20℃~80℃, at a stirring speed of 100~2000r / min, and stir for 1h~3h to obtain an anti-carbonation material that can reduce the amount of cement used.

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