CN112830708B - Efficient self-compensation hydration heat regulating agent and preparation method and application thereof - Google Patents
Efficient self-compensation hydration heat regulating agent and preparation method and application thereof Download PDFInfo
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- CN112830708B CN112830708B CN202110067512.XA CN202110067512A CN112830708B CN 112830708 B CN112830708 B CN 112830708B CN 202110067512 A CN202110067512 A CN 202110067512A CN 112830708 B CN112830708 B CN 112830708B
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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
Abstract
The invention discloses a high-efficiency self-compensation hydration heat regulating agent which comprises the following components in parts by mass: 70-85 parts of starch, 10-15 parts of phase change material and 3-5 parts of amylase; the preparation method comprises the following steps: s100: adding hydrogen peroxide, starch, sodium hydroxide diluent, water and borax solution into a reaction kettle in sequence, stirring, and cold-preparing gelatinized starch; s200: uniformly mixing the phase change material and amylase, adding the phase change material into the gelatinized starch, and uniformly mixing; s300: and (5) cooling and drying the mixture obtained in the step (S200) in vacuum to obtain the high-efficiency self-compensation hydration heat regulating agent. The application of the high-efficiency self-compensation hydration heat regulating agent in the regulation and control of the hydrothermal reaction is that the addition amount is 1-5% of the total amount of the externally-doped glue material. The concrete can be used for rapidly responding at a part with overhigh temperature in a targeted manner to play the regulation and control function, continuously controlling the hydration temperature, effectively preventing the generation of temperature stress and improving the mechanical property and the durability of the concrete.
Description
Technical Field
The invention relates to the field of building material functional additives, in particular to a high-efficiency self-compensation hydration heat regulating agent and a preparation method and application thereof.
Background
With the continuous promotion of the construction process of the infrastructure in China, the requirements on the strength and the durability of the concrete are also continuously improved, the concrete is composed of a cementing material, aggregates, an additive and water, the key of the strength requirement is to reduce the water-cement ratio, however, the reduction of the water-cement ratio can lead to the acceleration of the hydration rate of the cement, a large amount of heat is generated in a short time, and the internal temperature of the concrete is rapidly increased. Because the concrete thermal conductivity is poor, the internal heat can not be released, the external heat dissipation is fast, temperature stress cracks are easily generated, the integrity of a concrete structure is damaged, and the strength and the durability of the concrete are seriously influenced.
In order to solve the problems, measures such as adding a hydration heat regulation material, adjusting a cementing material system, embedding a cooling water pipe, cooling raw materials and the like are generally adopted in practical engineering application, wherein the addition of the hydration heat regulation material has the advantages of low cost, convenience in construction, wide application range and the like.
Patent CN106008771B discloses a cement hydration heat regulating material and a preparation method thereof, wherein a macromolecular compound with a micromolecular sugar structure is obtained by polymerizing micromolecular sugar styrene monomers, although glycogen molecules are introduced, the temperature of each position in a concrete structure is different, the crack occurrence position and time are also different, and the engineering progress is influenced by reducing the hydration process of the whole system by introducing glycogen in a single existence way.
Patent CN105271912A discloses a preparation method of a starch-based cement hydration heat regulating material, which is characterized in that dextrin, starch and dibasic acid anhydride are mixed and then melted and extruded, the material is easy to agglomerate in the melting process and is blocky when being added into concrete, particularly, after being mixed with mixing water, the material cannot be fully released to play a regulating effect, and the cleavage property of blocky agglomerates can also influence the strength of the concrete.
Disclosure of Invention
The invention mainly aims to provide an efficient self-compensation hydration heat regulating agent and a preparation method and application thereof aiming at the defects in the prior art, the efficient self-compensation hydration heat regulating agent is suitable for various high-strength concrete, particularly large-volume concrete which is easy to generate temperature stress cracks, is solid at normal temperature, can be used for quickly responding to a part with overhigh temperature to play a regulating function when being used for the concrete, continuously controls the hydration temperature, effectively prevents the generation of the temperature stress, and improves the mechanical property and the durability of the concrete.
In order to solve the technical problems, the invention provides an efficient self-compensation hydration heat regulator which comprises the following components in parts by weight:
70-85 parts of starch, 10-15 parts of phase change material and 3-5 parts of amylase.
As an improvement of the technical scheme, the starch is polysaccharide starch; the phase-change material is paraffin phase-change material; the amylase is alkali-resistant and high-temperature-resistant amylase.
As an improvement of the technical scheme, the polysaccharide starch is one or a mixture of more than two of wheat starch, corn starch, potato starch, cassava starch or waxy corn starch in any proportion.
As an improvement of the technical scheme, the paraffin phase change material has the carbon atom number of 30-40, the melting point of 65-80 ℃ and is in a powder shape.
As an improvement of the technical scheme, the alkali-resistant and high-temperature-resistant amylase is medium-temperature alpha-amylase and saccharifying enzyme, and the enzyme quantity ratio is 1: 2-1: 3.
As an improvement of the technical scheme, the medium temperature alpha-amylase is 65 ℃ alpha-amylase.
A preparation method of a high-efficiency self-compensation hydration heat regulator comprises the following steps:
s100: adding hydrogen peroxide, starch, sodium hydroxide diluent, water and borax solution into a reaction kettle in sequence, stirring, and cooling to prepare gelatinized starch;
s200: uniformly mixing the phase-change material and amylase, adding the mixture into gelatinized starch, and uniformly mixing;
s300: and (5) cooling and drying the mixture obtained in the step (S200) in vacuum to obtain the high-efficiency self-compensation hydration heat regulating agent.
As an improvement of the technical scheme, the borax solution is a 10% borax solution.
As an improvement of the technical scheme, the stirring time in S100 is 20-40 min.
As an improvement of the above technical solution, S200 is: and (3) uniformly mixing the phase change material and amylase, adding the phase change material into the gelatinized starch, stirring for 20-40 min, and uniformly mixing.
As an improvement of the technical scheme, the temperature is minus 50 ℃ to minus 30 ℃ and the vacuumizing time is 4h to 6h during vacuum cooling and drying. Furthermore, the temperature is-40 ℃ and the vacuumizing time is 6h when the vacuum cooling drying is carried out.
As an improvement of the technical scheme, after the vacuum cooling drying is finished, the obtained solid product is ground, and then the high-efficiency self-compensation hydration heat regulating agent is obtained.
The application of high-efficiency self-compensating hydration heat regulator in hydrothermal regulation and control has the addition amount of 1-5% of the total amount of externally-doped glue material.
The principle is as follows: starch is gelatinized as a solvent main body, so that powdery phase change materials and amylase are uniformly dispersed into the gelatinized starch, the activity (inactivation) of the amylase is kept by utilizing a vacuum cooling and drying technology, and the amylase can be uniformly dispersed and added into concrete to produce a hydration heat regulating material of a solid semi-finished product.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1) the efficient self-compensating hydration heat regulating agent provided by the invention can be used for rapidly responding at a part with overhigh temperature in a targeted manner to play a regulating function, continuously controlling the hydration temperature, effectively preventing the generation of temperature stress, improving the mechanical property and the durability of concrete, namely only rapidly responding at the part with rapidly rising temperature and playing a role when being added into the concrete, and avoiding the hydration process at the position with slower temperature rise;
2) the efficient self-compensation hydration heat regulating agent provided by the invention has a continuous effect when the phase-change material is cooled and shrunk, regulates the hydration process and prevents local pores from being generated;
3) the high-efficiency self-compensation hydration heat regulating agent provided by the invention is a solid powder semi-finished product, the production, storage and transportation costs are low, the solid powder state also enables the agent to be added in a mode of being doped with a cementing material, the use is convenient, the efficiency is high, the metering is convenient, and the engineering application value of the material is high;
4) the preparation method of the efficient self-compensation hydration heat regulator provided by the invention has no toxicity, no pungent smell, safety and environmental protection in the whole production link, and the key materials in the regulator are mixed, dispersed and solidified in a vacuum cooling and drying mode in the preparation process, so that the aim of inactivating (non-inactivating) amylase is fulfilled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a graph of concrete core temperature.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
Example 1
An efficient self-compensation hydration heat regulating agent comprises the following components in parts by weight:
85 parts of starch, 10 parts of phase change material and 3 parts of amylase;
the mass ratio of the starch is 1: 1: 1: 1 wheat starch, corn starch, potato starch, tapioca starch mixture;
the phase change material is paraffin phase change material, the number of carbon atoms is 30-40, the melting point is 65-80 ℃, and the phase change material is powdery;
the amylase is medium-temperature alpha-amylase and saccharifying enzyme at 65 ℃, and the enzyme amount ratio is 1: 2-1: 3;
the preparation method comprises the following specific steps:
weighing starch, phase change material and amylase in proportion;
sequentially adding a small amount of hydrogen peroxide, a starch mixture, a small amount of sodium hydroxide diluent, a certain amount of water and a 10% borax solution into a reaction kettle, stirring for 30min, and cold-preparing gelatinized starch;
uniformly mixing the powdery phase change material with amylase, adding the mixture into the gelatinized starch, and continuously stirring for 30 min;
and after uniformly mixing, placing the mixture in a vacuum cooling and drying device, cooling to-40 ℃, vacuumizing for 6h, and grinding the solid after drying to obtain the high-efficiency self-compensation hydration heat regulating agent.
Example 2
An efficient self-compensation hydration heat regulating agent comprises the following components in parts by weight:
80 parts of starch, 12 parts of phase change material and 4 parts of amylase;
the mass ratio of the starch is 1: 1: 1: 1 wheat starch, corn starch, potato starch, tapioca starch mixture;
the phase change material is paraffin phase change material, the number of carbon atoms is 30-40, the melting point is 65-80 ℃, and the phase change material is powdery;
the amylase is medium-temperature alpha-amylase and saccharifying enzyme at 65 ℃, and the enzyme amount ratio is 1: 2-1: 3;
the preparation method comprises the following specific steps:
weighing starch, phase change material and amylase in proportion;
sequentially adding a small amount of hydrogen peroxide, a starch mixture, a small amount of sodium hydroxide diluent, a certain amount of water and a 10% borax solution into a reaction kettle, stirring for 30min, and cold-preparing gelatinized starch;
uniformly mixing the powdery phase change material with amylase, adding the powdery phase change material into the gelatinized starch, and continuously stirring for 30 min;
and after uniformly mixing, placing the mixture in a vacuum cooling and drying device, cooling to-40 ℃, vacuumizing for 6h, and grinding the solid after drying to obtain the high-efficiency self-compensation hydration heat regulating agent.
Example 3
An efficient self-compensation hydration heat regulating agent comprises the following components in parts by weight:
75 parts of starch, 15 parts of phase change material and 5 parts of amylase;
the mass ratio of the starch is 1: 1: 1: 1 wheat starch, corn starch, potato starch, tapioca starch mixture;
the phase change material is paraffin phase change material, the number of carbon atoms is 30-40, the melting point is 65-80 ℃, and the phase change material is powdery;
the amylase is medium-temperature alpha-amylase and saccharifying enzyme at 65 ℃, and the enzyme amount ratio is 1: 2-1: 3;
the preparation method comprises the following specific steps:
weighing starch, phase change material and amylase in proportion;
sequentially adding a small amount of hydrogen peroxide, a starch mixture, a small amount of sodium hydroxide diluent, a certain amount of water and a 10% borax solution into a reaction kettle, stirring for 30min, and cold-preparing gelatinized starch;
uniformly mixing the powdery phase change material with amylase, adding the powdery phase change material into the gelatinized starch, and continuously stirring for 30 min;
and after uniformly mixing, placing the mixture in a vacuum cooling and drying device, cooling to-40 ℃, vacuumizing for 6h, and grinding the solid after drying to obtain the high-efficiency self-compensation hydration heat regulating agent.
Comparative example 1
Starch polysaccharide with the number average molecular weight of 3000-25000.
Comparative example 2
Paraffin wax with melting point of 70 ℃ and the like
Comparative example 3
Starch polysaccharide with the number average molecular weight of 3000-25000 and paraffin with the melting point of 70 ℃ in a mass ratio of 1:2, mixing the components.
The concrete trial forming is operated according to the requirements of 'common concrete mix proportion design technical specification' JGJ/T55-2011. The ordinary portland cement, the sand, the stone, the water and the additive are weighed according to the test mixture ratio, the test mixture ratio is shown in the following table 1, and the used examples 1-3 and comparative examples 1-3 account for 1.5% of the weight of the rubber material.
TABLE 1 test mix proportions
The hydration heat regulation performance of the concrete members (100cm x 100cm) with the insulation boards attached to the six surfaces thereof was evaluated by monitoring the temperature curve of the concrete members (100cm x 100cm) with the insulation boards attached to the six surfaces, and the concrete core temperature curve was as shown in fig. 1.
The 28d/56d compressive strength adopts GB/T50081-2002 Standard for testing mechanical properties of ordinary concrete, and the test results are shown in Table 2.
Table 2 shows the 28d/56d compressive strength test of concrete in examples 1 to 3 and comparative examples 1 to 3
| Numbering | 7d compressive Strength (MPa) | 28d compressive Strength (MPa) |
| Example 1 | 56.3 | 62.8 |
| Example 2 | 56.8 | 62.2 |
| Example 3 | 56.6 | 63.5 |
| Comparative example 1 | 51.0 | 55.2 |
| Comparative example 2 | 55.7 | 59.8 |
| Comparative example 3 | 51.2 | 56.1 |
As can be seen from FIG. 1, in examples 1 to 3, compared with comparative examples 1 to 3, the peak value of the core temperature is significantly reduced, and the change is more gradual, which indicates that the hydration heat regulating agent can rapidly respond and rapidly and gently control the core temperature when the temperature reaches a fixed value in the hydration process.
As can be seen from table 2, compared with comparative examples 1-3, the compression strength of the concrete blocks formed in examples 1-3 is obviously improved, and especially for other concrete blocks added with the phase-change material, the concrete blocks are more complete in structure, and a large amount of polysaccharide is generated by enzymolysis while the heat absorption and energy storage processes of the phase-change material are exerted, so that the temperature change of the core of the concrete tends to be smooth, and the phase-change material is prevented from generating pores when being changed in different states.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (8)
1. The efficient self-compensation hydration heat regulating agent is characterized by comprising the following components in parts by mass:
70-85 parts of starch, 10-15 parts of phase change material and 3-5 parts of amylase;
the preparation method comprises the following steps:
s100: adding hydrogen peroxide, starch, sodium hydroxide diluent, water and borax solution into a reaction kettle in sequence, stirring, and cold-preparing gelatinized starch;
s200: uniformly mixing the phase-change material and amylase, adding the mixture into gelatinized starch, and uniformly mixing;
s300: cooling and drying the mixture obtained in the step S200 in vacuum to obtain the high-efficiency self-compensating hydration heat regulating agent; the phase-change material is paraffin phase-change material.
2. The efficient self-compensating hydration heat regulator of claim 1, wherein the starch is a polysaccharide starch; the amylase is alkali-resistant and high-temperature-resistant amylase.
3. The high-efficiency self-compensating hydration heat regulation agent of claim 2, wherein the polysaccharide starch is one or a mixture of more than two of wheat starch, corn starch, potato starch, tapioca starch or waxy corn starch in any proportion.
4. The efficient self-compensating hydration heat regulator of claim 2, wherein the paraffin phase change material is in a powder form with a carbon atom number of 30-40 and a melting point of 65-80 ℃.
5. The efficient self-compensating hydration heat regulator of claim 2, wherein the alkali-resistant and high-temperature-resistant amylase is medium-temperature alpha-amylase and saccharifying enzyme, and the enzyme amount ratio is 1: 2-1: 3.
6. The efficient self-compensating hydration heat regulator of claim 5, wherein said mesophilic alpha-amylase is a 65 ℃ alpha-amylase.
7. The efficient self-compensating hydration heat regulator of claim 1, wherein the temperature is-50 ℃ to-30 ℃ and the vacuumizing time is 4h to 6h during vacuum cooling and drying.
8. The application of the high-efficiency self-compensating hydration heat regulator in the hydrothermal regulation and control as claimed in any one of claims 1 to 7, wherein the addition amount is 1-5% of the total amount of the externally-doped cementing material.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060762A (en) * | 2015-09-14 | 2015-11-18 | 江苏苏博特新材料股份有限公司 | Starch-based hydration heat regulation material preparation method |
| CN105217994A (en) * | 2015-10-29 | 2016-01-06 | 江苏苏博特新材料股份有限公司 | A kind of preparation method of starch base hydration heat of cement controlled material |
| CN105271912A (en) * | 2015-10-29 | 2016-01-27 | 江苏苏博特新材料股份有限公司 | Preparation method for hydration heat control material of starch-based cement |
| CN111377652A (en) * | 2018-12-29 | 2020-07-07 | 江苏苏博特新材料股份有限公司 | Mass concrete hydration temperature rise inhibitor, preparation method and application thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060762A (en) * | 2015-09-14 | 2015-11-18 | 江苏苏博特新材料股份有限公司 | Starch-based hydration heat regulation material preparation method |
| CN105217994A (en) * | 2015-10-29 | 2016-01-06 | 江苏苏博特新材料股份有限公司 | A kind of preparation method of starch base hydration heat of cement controlled material |
| CN105271912A (en) * | 2015-10-29 | 2016-01-27 | 江苏苏博特新材料股份有限公司 | Preparation method for hydration heat control material of starch-based cement |
| CN111377652A (en) * | 2018-12-29 | 2020-07-07 | 江苏苏博特新材料股份有限公司 | Mass concrete hydration temperature rise inhibitor, preparation method and application thereof |
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