A temperature-suppressing, crack-resistant and waterproofing agent, its preparation method and application

Abstract

The present invention relates to the technical field of concrete admixtures, and specifically, to a temperature-inhibiting crack-resistant waterproofing agent, a preparation method thereof, and an application thereof. The temperature-inhibiting crack-resistant waterproofing agent is mainly made of the following components by weight: 10.3 to 45 parts of amylase hydrolyzate, 1 to 6 parts of aluminum sulfate, 0.01 to 0.3 parts of a complexing agent, and water. The temperature-inhibiting crack-resistant waterproofing agent can significantly reduce the hydration heat of cement, reduce the cracks of concrete, and effectively improve the firmness of the concrete surface. The temperature-inhibiting crack-resistant waterproofing agent is applicable to large-volume concrete projects with strict requirements for controlling the hydration heat effect of cement, as well as other concrete application scenarios where strict management of temperature rise is required to prevent cracks.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete admixtures, and more specifically, to a temperature-inhibiting crack-resistant waterproofing agent, a preparation method thereof, and an application thereof. Background Art

[0002] In construction projects, concrete and reinforced concrete are the main materials for building structures. Due to the rapid expansion of the scale of economic construction, the construction industry is developing towards the direction of high, large, deep, and complex structures. Large equipment foundations in industrial buildings, box foundations and transfer floors of high-rise, super-high-rise and special-function buildings, and thick large-capacity pile caps with high bearing capacity are all large-volume reinforced concrete structures. Mass concrete has been widely used in industrial and civil buildings.

[0003] Mass concrete structures are thick, large in volume, dense in steel bars, and have a large one-time pouring volume. During the hardening period of mass concrete, due to the combined action of temperature changes caused by the hydration heat released during the cement hydration process and the shrinkage of concrete, the resulting temperature stress and shrinkage stress often lead to harmful cracks in the concrete structure.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The first object of the present invention is to provide a temperature-inhibiting crack-resistant waterproofing agent, which can significantly reduce the hydration heat of cement, reduce the cracks in concrete, and effectively improve the firmness of the concrete surface.

[0006] The second object of the present invention is to provide a preparation method of the temperature-inhibiting crack-resistant waterproofing agent, which has a simple and efficient process and is suitable for industrial production.

[0007] The third object of the present invention is to provide a method for inhibiting temperature rise and cracking of mass concrete, which can reduce the hydration temperature rise of mass concrete, reduce the cracking of concrete, and increase the compactness and mechanical properties of concrete.

[0008] In order to achieve the above objects of the present invention, the following technical solutions are specifically adopted:

[0009] One aspect of the present invention relates to a temperature-inhibiting crack-resistant waterproofing agent, which is mainly made of the following components by weight:

[0010] 10.3 - 45 parts of amylase hydrolyzate, 1 - 6 parts of aluminum sulfate, 0.01 - 0.3 parts of encapsulant, and water.

[0011] The described temperature-suppressing, crack-resistant and waterproofing agent can significantly reduce the hydration heat of cement, reduce the cracks in concrete, and effectively improve the firmness of the concrete surface. The described temperature-suppressing, crack-resistant and waterproofing agent is applicable to mass concrete projects with strict requirements for controlling the cement hydration heat effect, as well as other concrete application scenarios where strict management of temperature rise is required to prevent cracks.

[0012] Another aspect of the present invention also relates to a preparation method of the described temperature-suppressing, crack-resistant and waterproofing agent, which includes the following steps:

[0013] Perform a third reaction on a mixed solution containing amylase hydrolysate, aluminum sulfate and a complexing agent to obtain the temperature-suppressing, crack-resistant and waterproofing agent.

[0014] The preparation method of the described temperature-suppressing, crack-resistant and waterproofing agent has a simple and efficient process and is suitable for industrial production.

[0015] Another aspect of the present invention also relates to a method for suppressing temperature rise and cracking of mass concrete, which involves mixing the described temperature-suppressing, crack-resistant and waterproofing agent or the temperature-suppressing, crack-resistant and waterproofing agent prepared by the preparation method of the described temperature-suppressing, crack-resistant and waterproofing agent with concrete.

[0016] The method for suppressing temperature rise and cracking of the described mass concrete can reduce the hydration temperature rise of mass concrete, reduce the cracking of concrete, and increase the compactness and mechanical properties of concrete.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) Under certain temperature conditions, the present invention utilizes a Ca 2+ solution environment to enhance the activity of the enzyme and more efficiently hydrolyze amylase. According to the different suitable temperatures, pH values, target products and final products of the amylase bacterial strains, multiple temperature increases and staged inactivation are carried out to control the final product. Finally, a chelating agent is added to chelate Ca 2+ , making the amylase completely inactivated to prevent the amylase from affecting the materials added subsequently. In the process of preparing the amylase hydrolysate, the present invention efficiently hydrolyzes amylase by stimulating the activity of the enzyme and adjusts the final product through staged inactivation.

[0019] (2) The temperature-suppressing, crack-resistant and waterproofing agent provided by the present invention uses a complexing agent. Under certain temperature and pH value conditions, the complexing agent envelopes some of the finally formed small molecule monosaccharides, weakening their adverse effects on cement hydration and temperature rise. The subsequently added aluminum sulfate is used to slow down the retarding effect brought by the complexing agent that has not enveloped the guest molecules, improve the induction period to resist the generation of temperature cracks, and at the same time, part of the aluminum sulfate can react with the hydration product calcium aluminate of cement to form ettringite, improving the early strength of concrete to solve the problem of insufficient early strength caused by the delay of cement hydration.

[0020] (3) The temperature-suppressing, crack-resistant and waterproofing agent provided by the present invention, when used as a temperature-suppressing, crack-resistant and waterproofing agent for concrete, can significantly slow down the heat peak during the cement hydration process, thereby reducing the internal stress generated by temperature difference, effectively curbing the formation of temperature cracks, enhancing the crack resistance and waterproof performance of concrete, comprehensively improving the long-term durability and stability of the concrete structure, and at the same time improving the problem of insufficient early strength that may be caused by the delay of cement hydration.

[0021] (4) The temperature-suppressing, crack-resistant and waterproofing agent provided by the present invention is applicable to mass concrete projects with strict requirements for controlling the heat of cement hydration, as well as other concrete application scenarios that require strict management of temperature rise to prevent cracks. Specific Embodiments

[0022] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. However, those skilled in the art will understand that the following described embodiments are some embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention. For those conditions not specified in the embodiments, they shall be carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0023] One aspect of the present invention relates to a temperature-suppressing, crack-resistant and waterproofing agent, which is mainly made of the following components by weight:

[0024] Amylase hydrolyzate 10.3 - 45 parts, aluminum sulfate 1 - 6 parts, encapsulant 0.01 - 0.3 parts and water.

[0025] In some specific embodiments, by weight, the amylase hydrolyzate includes but is not limited to any point value of 10.3 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts or 45 parts or the range value between any two of them.

[0026] In some specific embodiments, by weight, the aluminum sulfate includes but is not limited to any point value of 1 part, 2 parts, 3 parts, 4 parts, 5 parts or 6 parts or the range value between any two of them.

[0027] In some specific embodiments, by weight, the encapsulant includes but is not limited to any point value of 0.01 part, 0.05 part, 0.08 part, 0.1 part, 0.15 part, 0.2 part, 0.25 part or 0.3 part or the range value between any two of them.

[0028] In some specific embodiments, by weight, the water includes, but is not limited to, any one of the point values of 65 parts, 70 parts, 75 parts, 80 parts or 85 parts, or the range values between any two of them.

[0029] The temperature suppression, crack resistance and waterproofing agent described above, when used as a concrete temperature suppression, crack resistance and waterproofing agent, can significantly slow down the heat peak value during the cement hydration process, thereby reducing the internal stress generated by temperature difference, effectively curbing the formation of temperature cracks, enhancing the crack resistance and waterproofing performance of concrete, comprehensively improving the long-term durability and stability of the concrete structure, and at the same time improving the problem of insufficient early strength that may be caused by the delay of cement hydration.

[0030] The temperature suppression, crack resistance and waterproofing agent provided by the present invention uses a complexing agent. Under certain temperature and pH value conditions, the complexing agent envelopes some of the finally formed small molecule monosaccharides, weakening their adverse effects on cement hydration and temperature rise. The subsequent addition of aluminum sulfate is used to slow down the retarding effect brought by the complexing agent that does not envelope the guest molecules, increase the induction period to resist the generation of temperature cracks, and at the same time, part of the aluminum sulfate can react with the hydration product calcium aluminate hydrate of cement to form ettringite, improving the early strength of concrete to solve the problem of insufficient early strength caused by the delay of cement hydration.

[0031] During the process of treating starch dextrin, β-amylase cuts the α-1,4-glycosidic bond in turn with maltose as the unit from the non-reducing end. During the process of treating starch dextrin, pullulanase cuts the α-1,6-glycosidic bond, reducing the molecular weight of starch dextrin to form organic oligosaccharides with a specific molecular weight. During the cement hydration process, organic molecules adsorb on the surface of the C-S-H crystal nucleus to inhibit the growth of C-S-H gel, delaying the cement hydration process and reducing the hydration temperature peak value.

[0032] Furthermore, the temperature suppression, crack resistance and waterproofing agent described above is mainly made of the following components by weight:

[0033] 13-42 parts of amylase hydrolyzate, 2-5 parts of aluminum sulfate, 0.05-0.2 parts of complexing agent and water.

[0034] Aluminum sulfate is an inorganic compound, a white powder, with the molecular formula of Al2(SO4)3·nH2O and a density of 2.66 g / cm 3 .

[0035] Furthermore, the amylase hydrolyzate is mainly prepared by the following steps;

[0036] Carry out a first reaction on the mixed solution containing calcium salt and enzyme; add the starch to the mixed system after the first reaction and then carry out a second reaction; add a chelating agent to the mixed system after the second reaction. The first reaction has the effect of activating the enzyme activity of the calcium salt and regulating the enzymatic hydrolysis ability of the enzyme, and the second reaction has the effect of enzymatically hydrolyzing starch to generate oligosaccharides.

[0037] In the process of preparing the amylase hydrolyzate of the present invention, the activity of the enzyme is stimulated to efficiently hydrolyze the amylase, and the final product is adjusted by means of stepwise inactivation. Under certain temperature conditions, using Ca 2+ solution environment to enhance the activity of the enzyme and more efficiently hydrolyze the amylase; according to the suitable temperature, pH value, target product and final product of the amylase bacterial strain, by increasing the temperature multiple times and inactivating in segments to control the final product. Finally, a chelating agent is added to chelate Ca 2+ , so that the amylase is completely inactivated to prevent the amylase from affecting the materials added subsequently.

[0038] Furthermore, the temperature of the first reaction is 30-80°C, including but not limited to any point value among 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C or the range value between any two of them. The temperature of the first reaction should be controlled within a reasonable range. If the temperature of the first reaction is too high, some enzymes will be inactivated, and if the temperature is too low, the enzyme activity will be insufficient. In either case, the target product cannot be obtained.

[0039] Furthermore, the time of the first reaction is 1-4 h, including but not limited to any point value among 1 h, 2 h, 3 h or 4 h or the range value between any two of them.

[0040] Furthermore, the temperature of the second reaction is 50-160°C, including but not limited to any point value among 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C or 150°C or the range value between any two of them. In the second reaction, the temperature is regulated to inactivate some enzymes to regulate the enzymatic hydrolysis product.

[0041] Furthermore, the time of the second reaction is 1-3 h, including but not limited to any point value among 1 h, 1.5 h, 2 h, 2.5 h or 3 h or the range value between any two of them.

[0042] Furthermore, the calcium salt includes but not limited to at least one of calcium chloride, triethanolamine or calcium nitrite.

[0043] Calcium chloride is an inorganic salt, white powder, with the molecular formula CaCl2 and a density of 2.15 g / cm 3 .

[0044] Furthermore, the enzyme includes pullulanase and β-amylase with a mass ratio of 0.2-0.8:0.05-0.2 (for example, but not limited to 0.48:0.12, 0.2:0.05, 0.64:0.16, 0.8:0.2 or 0.48:0.12).

[0045] Pullulanase is a protein enzyme, in the form of a yellowish-brown powder, with an enzyme activity of 2000 u / g.

[0046] β-Amylase is a protein enzyme, in the form of a solid powder ranging from yellowish-brown to dark brown, with an enzyme activity of 10000 u / g.

[0047] The present invention does not limit the specific type of chelating agent, and any chelating agent with the function of chelating Ca 2+ in the art can implement the technical solution of the present invention. In some preferred embodiments, the chelating agent includes but is not limited to at least one of ethylenediaminetetraacetic acid, ethylenediaminetriaminepentaacetic acid, tartaric acid, or hydroxyethylethylenediaminetriacetic acid.

[0048] Ethylenediaminetetraacetic acid is an organic compound, in the form of a white powder, with a molecular formula of C 10 H 16 N2O8, and a density of 1.02 g / cm 3 .

[0049] Furthermore, the mass ratio of the calcium salt, the enzyme, and the starch is 0.1 - 2:0.1 - 1:10 - 40, including but not limited to 0.1:1:10, 1:0.8:20, 1.5:0.5:30, or 2:0.1:40.

[0050] Furthermore, the mass ratio of the calcium salt and the chelating agent is 0.1 - 2:0.1 - 2, including but not limited to 0.1:2, 0.5:1.5, 1.5:0.5, or 2:0.1.

[0051] Limiting the dosages of the calcium salt, the enzyme, the starch, and the chelating agent within a certain range can ensure that the enzyme exhibits the best enzymatic hydrolysis effect, effectively terminate the enzymatic hydrolysis reaction at the end of the enzymatic hydrolysis, and precisely control the final product to be the target product.

[0052] The present invention does not specifically limit the type of encapsulating agent, and any conventional encapsulating agent in the art can be used to implement the technical solution of the present invention. In some preferred embodiments, the encapsulating agent includes but is not limited to β-cyclodextrin.

[0053] β-Cyclodextrin is a cyclic oligosaccharide, in the form of a white powder, with a molecular formula of C 42 H 70 O 35 , and a density of approximately 1.27 g / cm 3 .

[0054] The present invention does not specifically limit the type of starch, and conventional starches in the art can be used to implement the technical solution of the present invention. In some preferred embodiments, further selection of the starch type is made based on the ratio of amylopectin and amylose in different types of starches. The starches include, but are not limited to, cassava starch and / or pea starch.

[0055] Furthermore, the starch includes: cassava starch and pea starch, and the mass ratio of cassava starch to pea starch is 14-24.5:6-10.5, including but not limited to 21:9, 17.5:7.5, 14:6, 24.5:10.5 or 17.5:7.5.

[0056] Cassava starch is a natural polymer compound, a white powder slightly yellowish, with the molecular formula (C6H 10 O5)n and a density of 0.96 g / cm 3 .

[0057] Pea starch is a natural polymer compound, a white powder, with the molecular formula (C6H 10 O5)n and a density of 1.5 g / cm 3 .

[0058] Another aspect of the present invention also relates to a preparation method of the temperature suppression, crack resistance and waterproof agent, including the following steps:

[0059] Performing a third reaction on a mixed solution containing an enzyme hydrolysis product of starch, aluminum sulfate and a complexing agent to obtain the temperature suppression, crack resistance and waterproof agent.

[0060] The preparation method of the temperature suppression, crack resistance and waterproof agent has the advantages of simple process, high efficiency and suitability for industrial production.

[0061] Furthermore, the temperature of the third reaction is 90-200 °C, including but not limited to any point value of 90 °C, 100 °C, 110 °C, 120 °C, 130 °C, 140 °C, 150 °C, 160 °C, 170 °C, 180 °C, 190 °C or 200 °C or the range value between any two of them. Controlling the temperature of the third reaction within a reasonable range can extend the shelf life of the waterproof agent and completely inactivate the amylase.

[0062] Furthermore, the time of the third reaction is 3-9 h, including but not limited to any point value of 3 h, 4 h, 5 h, 6 h, 7 h, 8 h or 9 h or the range value between any two of them.

[0063] Another aspect of the present invention also relates to a method for suppressing temperature rise and cracking of mass concrete, mixing the temperature suppression, crack resistance and waterproof agent or the temperature suppression, crack resistance and waterproof agent prepared by the preparation method of the temperature suppression, crack resistance and waterproof agent with concrete.

[0064] This method can reduce the hydration temperature rise of mass concrete, reduce the cracking of concrete, and increase the compactness and mechanical properties of concrete.

[0065] Furthermore, the addition amount of the temperature suppression, crack resistance and waterproofing agent is 0.1% - 0.3% of the mass of the cementitious materials in the concrete, including but not limited to any point value of 0.1%, 0.15%, 0.2%, 0.25% or 0.3% or the range value between any two of them. The addition amount of the temperature suppression, crack resistance and waterproofing agent should be controlled within a reasonable range. If the addition amount is too small, the expected technical effect cannot be achieved, and if the addition amount is too large, the concrete will not set.

[0066] Furthermore, the cementitious materials include at least one of cement, asphalt, lime or gypsum.

[0067] Next, the implementation scheme of the present invention will be described in detail in combination with embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. For those not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0068] Example 1

[0069] The temperature suppression, crack resistance and waterproofing agent provided in this example is mainly made of the following components by weight:

[0070] 31.6 parts of amylase hydrolyzate, 3 parts of aluminum sulfate, 0.1 part of β-cyclodextrin and 65.3 parts of water.

[0071] The preparation method of the temperature suppression, crack resistance and waterproofing agent provided in this example includes the following steps:

[0072] 1. Mix calcium chloride, enzyme and water. The enzyme includes pullulanase and β-amylase with a mass ratio of 0.48:0.12. The mass ratio of calcium chloride to enzyme is 0.8:0.6. Heat up to 30°C and continue stirring for 4 hours to complete the first reaction;

[0073] 2. Add starch. The mass ratio of calcium chloride to starch is 0.8:30. The starch includes tapioca starch and pea starch with a mass ratio of 21:9. Heat up to 160°C and continue stirring for 1 hour to complete the second reaction; after the reaction ends, add ethylenediaminetetraacetic acid. The mass ratio of calcium chloride to ethylenediaminetetraacetic acid is 0.8:0.2 to obtain amylase hydrolyzate;

[0074] 3. Add β-cyclodextrin and aluminum sulfate to the amylase hydrolyzate, stir evenly, adjust the temperature to 200°C, and continue reacting for 3 hours to complete the third reaction to obtain the temperature suppression, crack resistance and waterproofing agent.

[0075] Example 2

[0076] The temperature-suppressing, anti-cracking and waterproofing agent provided in this embodiment is mainly made of the following components in parts by weight:

[0077] 27.25 parts of starch hydrolysate, 1.5 parts of aluminum sulfate, 0.05 parts of β-cyclodextrin and 71.2 parts of water.

[0078] The preparation method of the temperature-suppressing and anti-cracking waterproof agent provided in this embodiment comprises the following steps:

[0079] 1. Mix calcium chloride, enzyme and water, the enzyme includes pullulanase and β-amylase in a mass ratio of 0.2:0.05, and the mass ratio of calcium chloride to enzyme is 1.5:0.25, heat to 80°C, and continue stirring for 1 hour to complete the first reaction;

[0080] 2. Add starch, the mass ratio of calcium chloride to starch is 1.5:25, the starch includes cassava starch and pea starch with a mass ratio of 17.5:7.5, heat to 50°C, continue stirring for 3 hours to complete the second reaction; after the reaction, add ethylenediaminetetraacetic acid, the mass ratio of calcium chloride to ethylenediaminetetraacetic acid is 1.5:0.5, and obtain starch hydrolysate;

[0081] 3. Add β-cyclodextrin and aluminum sulfate to the starch hydrolysate, stir evenly, adjust the temperature to 90°C, and continue the reaction for 3 hours to complete the third reaction to obtain a temperature-suppressing, anti-cracking and waterproofing agent.

[0082] Example 3

[0083] The temperature-suppressing, anti-cracking and waterproofing agent provided in this embodiment is mainly made of the following components in parts by weight:

[0084] 22.8 parts of starch hydrolysate, 2 parts of aluminum sulfate, 0.2 parts of β-cyclodextrin and 75 parts of water.

[0085] The preparation method of the temperature-suppressing and anti-cracking waterproof agent provided in this embodiment comprises the following steps:

[0086] 1. Mix calcium chloride, enzyme and water, the enzyme includes pullulanase and β-amylase in a mass ratio of 0.64:0.16, and the mass ratio of calcium chloride to enzyme is 1:0.8, heat to 70°C, and continue stirring for 2 hours to complete the first reaction;

[0087] 2. Add starch, the mass ratio of calcium chloride to starch is 1:20, the starch includes cassava starch and pea starch with a mass ratio of 14:6, heat to 130°C, continue stirring for 2 hours to complete the second reaction; after the reaction, add ethylenediaminetetraacetic acid, the mass ratio of calcium chloride to ethylenediaminetetraacetic acid is 1:1, and obtain starch hydrolysate;

[0088] 3. Add β-cyclodextrin and aluminum sulfate into the amylase hydrolyzate, stir evenly, adjust the temperature to 180 °C, and continue the reaction for 8 h to complete the third reaction, obtaining the temperature-inhibiting, crack-resistant and waterproof agent.

[0089] Example 4

[0090] The temperature-inhibiting, crack-resistant and waterproof agent provided in this example is mainly made of the following components by weight:

[0091] 39.5 parts of amylase hydrolyzate, 1 part of aluminum sulfate, 0.3 part of β-cyclodextrin and 59.2 parts of water.

[0092] The preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example includes the following steps:

[0093] 1. Mix calcium chloride, enzyme and water. The enzyme includes pullulanase and β-amylase with a mass ratio of 0.8:0.2. The mass ratio of calcium chloride to the enzyme is 2:1. Heat up to 60 °C and continue stirring for 3 h to complete the first reaction;

[0094] 2. Add starch. The mass ratio of calcium chloride to starch is 2:35. The starch includes tapioca starch and pea starch with a mass ratio of 24.5:10.5. Heat up to 90 °C and continue stirring for 2.5 h to complete the second reaction; after the reaction ends, add ethylenediaminetetraacetic acid. The mass ratio of calcium chloride to ethylenediaminetetraacetic acid is 2:1.5 to obtain the amylase hydrolyzate;

[0095] 3. Add β-cyclodextrin and aluminum sulfate into the amylase hydrolyzate, stir evenly, adjust the temperature to 100 °C, and continue the reaction for 6 h to complete the third reaction, obtaining the temperature-inhibiting, crack-resistant and waterproof agent.

[0096] Example 5

[0097] The temperature-inhibiting, crack-resistant and waterproof agent provided in this example is mainly made of the following components by weight:

[0098] 27.6 parts of amylase hydrolyzate, 3 parts of aluminum sulfate, 0.15 part of β-cyclodextrin and 69.25 parts of water.

[0099] The preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example includes the following steps:

[0100] 1. Mix calcium chloride, enzyme and water. The enzyme includes pullulanase and β-amylase with a mass ratio of 0.48:0.12. The mass ratio of calcium chloride to the enzyme is 1:0.6. Heat up to 40 °C and continue stirring for 3.5 h to complete the first reaction;

[0101] 2. Add starch. The mass ratio of calcium chloride to starch is 1:25. The starch includes cassava starch and pea starch with a mass ratio of 17.5:7.5. Heat up to 100 °C and continue stirring for 1.5 h to complete the second reaction; after the reaction ends, add ethylenediaminetetraacetic acid. The mass ratio of calcium chloride to ethylenediaminetetraacetic acid is 1:1 to obtain the amylase hydrolyzate.

[0102] 3. Add β-cyclodextrin and aluminum sulfate to the amylase hydrolyzate, stir evenly, adjust the temperature to 130 °C, and continue the reaction for 5 h to complete the third reaction to obtain the temperature-inhibiting, crack-resistant and waterproof agent.

[0103] Example 6

[0104] The difference between the preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example and that in Example 1 is that calcium chloride is not added in step 1, and the rest is the same as in Example 1.

[0105] Example 7

[0106] The difference between the preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example and that in Example 1 is that the temperature of the first reaction is 20 °C and the temperature of the second reaction is 40 °C, and the rest is the same as in Example 1.

[0107] Example 8

[0108] The difference between the preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example and that in Example 1 is that the starch is corn starch, and the rest is the same as in Example 1.

[0109] Example 9

[0110] The difference between the preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example and that in Example 1 is that the mass ratio of pullulanase to β-amylase is 0.1:0.5, and the rest is the same as in Example 1.

[0111] Example 10

[0112] The difference between the preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example and that in Example 1 is that the temperature of the third reaction is 80 °C, and the rest is the same as in Example 1.

[0113] Comparative Example 1

[0114] The temperature-inhibiting, crack-resistant and waterproof agent provided in this comparative example is mainly made of the following components by weight:

[0115] 55 parts of amylase hydrolyzate, 0.5 part of aluminum sulfate, 0.5 part of β-cyclodextrin and 44 parts of water.

[0116] The preparation method of the temperature-inhibiting, crack-resistant and waterproof agent provided in this example is the same as that in Example 1.

[0117] Experimental Example

[0118] The test methods for the temperature suppression rate and the initial temperature rise of 5°C refer to the test methods in the specification "T / XCECS10270-2023 Concrete Temperature Suppression, Crack Resistance and Waterproofing Agent". The compressive strength is carried out according to the method specified in GB 175-2023 "Common Portland Cement". The water penetration height is carried out according to the water penetration height method specified in GB / T 50082. The test mix ratio is: 2000 g of cement, 700 g of water, and the dosage of the temperature suppression and crack resistance waterproofing agent is 0.2% of the mass of the cement. The test results are shown in Table 1:

[0119] Table 1

[0120]

[0121]

[0122] It can be seen from Table 1 that the temperature suppression, crack resistance and waterproofing agent provided by the present invention, through the synergistic cooperation of its components and their mass ratios, is applicable to large-volume concrete projects with strict requirements for controlling the heat of hydration of cement, can significantly reduce the heat of hydration of concrete, delay the time of the hydration temperature peak, and at the same time has little impact on the early and late strengths of concrete. Due to the reduction of cracks, the density and surface firmness of concrete are improved.

[0123] Although the present invention has been illustrated and described with specific embodiments, it should be realized that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; those of ordinary skill in the art should understand that: without departing from the spirit and scope of the present invention, the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such replacements and modifications belonging to the scope of the present invention are included in the appended claims.

Claims

1. A temperature-suppressing, anti-cracking and waterproofing agent, characterized in that: Mainly made of the following components by weight: 10.3-45 parts of starch hydrolysate, 1-6 parts of aluminum sulfate, 0.01-0.3 parts of inclusion agent and water; The starch hydrolysate is mainly prepared by the following steps: The mixed solution containing calcium salt and enzyme is subjected to a first reaction; starch is added to the mixed system after the first reaction and then subjected to a second reaction; adding a chelating agent to the mixed system after the second reaction; The calcium salt includes: calcium chloride or calcium nitrite; The enzymes include: pullulanase and β-amylase in a mass ratio of 0.2-0.8:0.05-0.2; The chelating agent includes at least one of ethylenediaminetetraacetic acid, ethyleneditriaminepentaacetic acid, tartaric acid or hydroxyethylethylenediaminetriacetic acid; The inclusion agent is: β-cyclodextrin; The starch comprises: cassava starch and pea starch, and the mass ratio of cassava starch to pea starch is 14-24.5:6-10.

5.

2. The temperature-suppressing, anti-cracking and waterproofing agent according to claim 1, characterized in that: Includes at least one of the following technical features: (1) The temperature of the first reaction is 30-80°C; (2) The first reaction time is 1 to 4 hours; (3) The temperature of the second reaction is 50-160°C; (4) The time of the second reaction is 1 to 3 hours.

3. The temperature-suppressing, anti-cracking and waterproofing agent according to claim 1, characterized in that: The mass ratio of the calcium salt, the enzyme and the starch is 0.1-2:0.1-1:10-40; And / or, the mass ratio of the calcium salt to the chelating agent is 0.1-2:0.1-2.

4. The method for preparing the temperature-suppressing and anti-cracking waterproofing agent according to any one of claims 1 to 3, characterized in that: The following steps are involved: The mixed solution containing the starch hydrolysate, aluminum sulfate and the inclusion agent is subjected to a third reaction to obtain the temperature-suppressing, anti-cracking and waterproofing agent.

5. The method for preparing the temperature-suppressing, anti-cracking and waterproofing agent according to claim 4, characterized in that: The temperature of the third reaction is 90-200°C; The time of the third reaction is 3 to 9 hours.

6. A method for suppressing temperature and resisting cracking of large volume concrete, characterized in that: The temperature-suppressing and anti-cracking waterproofing agent prepared by the preparation method of the temperature-suppressing and anti-cracking waterproofing agent according to any one of claims 1 to 3 or the temperature-suppressing and anti-cracking waterproofing agent according to claim 4 or 5 is mixed with concrete.

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