CN117447157A - Low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material and preparation method thereof - Google Patents
Low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 52
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 35
- 239000000956 alloy Substances 0.000 claims abstract description 35
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 34
- 239000004917 carbon fiber Substances 0.000 claims abstract description 34
- 239000004005 microsphere Substances 0.000 claims abstract description 34
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 17
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000003469 silicate cement Substances 0.000 claims abstract description 11
- 238000002844 melting Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 3
- PSMFTUMUGZHOOU-UHFFFAOYSA-N [In].[Sn].[Bi] Chemical compound [In].[Sn].[Bi] PSMFTUMUGZHOOU-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 230000036571 hydration Effects 0.000 abstract description 13
- 238000006703 hydration reaction Methods 0.000 abstract description 13
- 239000004566 building material Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 239000004567 concrete Substances 0.000 description 9
- 239000008030 superplasticizer Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 239000012782 phase change material Substances 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004227 thermal cracking Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000743 fusible alloy Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/34—Metals, e.g. ferro-silicon
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/386—Carbon
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a cement-based composite material with low temperature rise, high heat conduction and high crack resistance and a preparation method thereof, belonging to the technical field of building materials. The cement-based composite material provided by the invention comprises the following raw materials in parts by weight: 655-685 parts of silicate cement, 1300-1380 parts of river sand, 0.5-2.5 parts of carbon fiber, 26-83 parts of low-melting-point alloy phase-change microspheres, 260-275 parts of water and 0.6-1.8 parts of polycarboxylate water reducer. According to the invention, the low-melting-point alloy phase-change microspheres with high volume latent heat and the high-thermal-conductivity carbon fibers are introduced into the cement-based material, and the rupture strength and the thermal conductivity of the cement-based composite material are obviously improved by utilizing the synergistic effect of the carbon fibers and the low-melting-point alloy phase-change microspheres. Meanwhile, the internal hydration temperature is greatly reduced, so that the risk of forming thermal cracks is reduced.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a cement-based composite material with low temperature rise, high heat conduction and high crack resistance and a preparation method thereof.
Background
The concrete has become the first choice engineering material for modern production and construction because of the advantages of convenient raw materials, low price, stable mechanical property and the like. However, the inherent quasi-brittle character of concrete, namely low tensile strength, limited toughness, and susceptibility to cracking, has hindered its further development. In addition, a non-negligible problem is poor thermal conductivity of hydration products, and in the early stage of construction, heat generated by hydration is accumulated in the structure and is difficult to effectively diffuse, so that the internal temperature is increased, and the surface is contacted with the external environment to dissipate heat quickly, so that a larger temperature difference is generated between the interior and the surface of the concrete. This large temperature difference can cause thermal cracks to form in the concrete structure due to temperature stress, which poses a threat to the durability thereof.
The control methods for thermal cracking of cement structures can be divided into two main categories. One is the incorporation of various types of fiber-reinforced cement-based materials into their own crack resistance, but the presence of some limitations on the fibers themselves results in little improvement and negative impact on the durability of the cement matrix. The other method is to reduce the temperature gradient through construction measures such as pre-burying cooling water pipes, layered pouring, surface heat preservation maintenance and the like. These measures not only have limited temperature reducing effects, but also add complexity and cost to the construction process. The addition of phase change material is also a simple and easy means of reducing the temperature gradient. However, the conventional organic/inorganic phase change material itself has poor heat conductive properties and mechanical properties and is not active, and has been proved to be a serious disadvantage, which inevitably results in a decrease in compressive strength and heat conductive properties of the set cement. This is contrary to the original purpose of improving the properties of concrete. In this respect, one of the most promising answers is a low melting point alloy, which has been receiving attention because of its advantages of good electrical conductivity, good thermal conductivity, small volume change, high heat storage density, stable performance, and the like. The unique properties of low melting point alloys allow them to be converted to a liquid state resembling running water at lower temperatures (30-200 c) while still maintaining metallic properties. When the temperature cools below the melting point, they can quickly transition to a solid state, restoring the strength and rigidity typical of metals. At present, low-melting-point alloy is rarely used as an effective phase change material for improving the concrete performance and reducing the development of thermal cracks.
Disclosure of Invention
In view of the above, the invention aims to provide a cement-based composite material with low temperature rise, high heat conduction and high crack resistance and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions: the cement-based composite material with low temperature rise, high heat conduction and high crack resistance comprises the following raw materials in parts by weight: 655-685 parts of silicate cement, 1300-1380 parts of river sand, 0.5-2.5 parts of carbon fiber, 26-83 parts of low-melting-point alloy phase-change microspheres, 260-275 parts of water and 0.6-1.8 parts of polycarboxylate water reducer.
Preferably, the material comprises the following raw materials in parts by weight: 660-680 parts of silicate cement, 1300-1360 parts of river sand, 0.5-2 parts of carbon fiber, 26-83 parts of low-melting-point alloy phase-change microspheres, 260-275 parts of water and 1-1.8 parts of polycarboxylate water reducer.
Further preferably, the portland cement is pii.52.5 grade ordinary portland cement.
Further preferably, the fineness modulus of the river sand is 2.6-2.9, and the grain diameter is 0.08-2mm.
Further preferably, the carbon fiber has a thermal conductivity of 640W/mK, a filament diameter of 8-12 μm, and an aspect ratio of 10-20:1.
Further preferably, the low-melting-point alloy phase-change microspheres are polyvinyl alcohol coated indium-bismuth-tin alloy, the particle size of the low-melting-point alloy phase-change microspheres is 10-80 mu m, the melting point is 62.6 ℃, and the volume potential heat value is 214MJ/m 3 。
Further preferably, the solid content of the polycarboxylate water reducer is 40wt% or more, and the water reduction rate is 33.9% or more.
The invention also provides a preparation method of the cement-based composite material, which comprises the following steps:
(1) Mixing carbon fiber, a water reducing agent and water, and performing ultrasonic treatment to obtain a carbon fiber suspension;
(2) Uniformly stirring silicate cement and low-melting-point alloy phase-change microspheres at a low speed to obtain a mixed dry material;
(3) Adding river sand into the mixed dry material obtained in the step (2), and uniformly stirring at a low speed to obtain a mixture;
(4) And (3) pouring the carbon fiber suspension obtained in the step (1) into the mixture obtained in the step (3), and stirring at a low speed and then at a high speed to obtain the low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material.
Preferably, in the step (1), the ultrasonic power is 120-140W, and the ultrasonic time is 8-10min.
Preferably, the equipment used for stirring in the steps (2), (3) and (4) is a standard planetary cement mortar stirrer.
The technical mechanism is as follows: the hydration temperatures typically achievable inside concrete structures are 80 ℃ or higher. The low-melting-point alloy phase-change microspheres used in the invention are solid at normal temperature, and the melting point is 60 ℃, so that the alloy microspheres can finish the transition from solid state to liquid state to solid state in the early hydration stage of cement-based materials. In addition, the carbon fiber can keep good dispersion in the cement structure under the ultrasonic treatment of taking the water reducing agent as a dispersing agent. The fused low-melting-point alloy phase-change microspheres can flow to fill the pores and microcracks of a nearby matrix, overlap with carbon fibers to form a network skeleton, endow rigid hydration products with flexibility, and improve the flexural strength of the cement-based composite material. The low-melting-point alloy phase-change microspheres and the carbon fibers have higher heat conductivity, and the network skeleton also improves the heat conductivity of the cement-based material and enhances the transmission of heat inside the cement structure to the outside. Meanwhile, the internal hydration temperature of the cement-based material can be obviously reduced by combining with the high-volume latent heat of the low-melting-point alloy phase-change microspheres, so that the risk of thermal cracking caused by internal and external temperature gradients is reduced.
The beneficial technical effects are as follows:
1. the low-melting-point alloy phase-change microsphere adopted by the invention has the advantages of high heat conductivity coefficient, high energy storage density, good mechanical strength and stable thermal performance. By combining with the high heat conduction carbon fiber, not only the cracking resistance and heat transfer capacity of the cement-based material can be enhanced, but also the hydration heat can be stored and absorbed through the phase change of the low-melting-point alloy phase change microspheres, so that the highest temperature which can be reached in the cement-based material is reduced, and the risk of thermal cracking is reduced.
2. The invention overcomes the defects of high brittleness and poor toughness of cement-based materials, and simultaneously solves the problem that the strength and the heat conducting property of the concrete are reduced due to the fact that the internal temperature of the concrete is regulated by using the traditional phase-change materials.
3. The cement-based composite material prepared by the method has the advantages of low temperature rise, high heat conduction, high crack resistance and the like, provides a promising method for effectively improving the thermal performance and crack resistance of the cement-based material, and provides references for the application of low-melting-point alloy in the building industry.
4. The preparation method provided by the invention is simple to operate, does not need complex pretreatment, and does not influence the construction period.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
In the following examples, portland cement was PII.52.5 grade Portland cement; the fineness modulus of the river sand is 2.6-2.9, and the grain diameter is 0.08-2mm; the heat conductivity coefficient of the carbon fiber is 640W/m.K, the diameter of the monofilament is 8-12 mu m, and the length-diameter ratio is 10-20:1; the low-melting point alloy phase-change microsphere is polyvinyl alcohol coated indium-bismuth-tin alloy, the grain diameter is 10-80 mu m, the melting point is 62.6 ℃, and the volume potential heat value is 214MJ/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The water meets the requirements of cement mortar water (GB 8076-2008); the solid content of the polycarboxylate water reducer is more than or equal to 40wt%, and the water reducing rate is more than or equal to 33.9%.
Example 1
The low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material comprises the following raw materials in parts by weight:
668 parts of silicate cement, 1336 parts of river sand, 0.7 part of carbon fiber, 27 parts of low-melting-point alloy phase-change microspheres, 266 parts of water and 1 part of polycarboxylate superplasticizer.
The preparation method comprises the following steps:
(1) Mixing the weighed carbon fiber, the water reducing agent and water in proportion, and performing ultrasonic treatment to obtain a carbon fiber suspension, wherein the ultrasonic power is 120W and the time is 10min;
(2) Placing cement and low-melting-point alloy phase-change microspheres in a standard planetary cement mortar mixer according to a proportion, and stirring for 1min at a low speed to obtain a uniform mixed dry material;
(3) Adding the weighed river sand into the mixed dry material, and stirring at a low speed for 1min to obtain a uniform mixture;
(4) And (3) adding the suspension obtained in the step (1) into the mixture, and stirring for 2min at a low speed and then stirring for 1min at a high speed to obtain the low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material.
Example 2
The low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material comprises the following raw materials in parts by weight:
665 parts of silicate cement, 1330 parts of river sand, 0.7 part of carbon fiber, 54 parts of low-melting-point alloy phase-change microspheres, 265 parts of water and 1.3 parts of polycarboxylate superplasticizer.
The preparation method is the same as in example 1.
Example 3
The low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material comprises the following raw materials in parts by weight:
663 parts of Portland cement, 1326 parts of river sand, 0.7 part of carbon fiber, 80 parts of low-melting-point alloy phase-change microspheres, 264 parts of water and 1.7 parts of polycarboxylate water reducer.
The preparation method is the same as in example 1.
Example 4
The low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material comprises the following raw materials in parts by weight:
680 parts of Portland cement, 1360 part of river sand, 2.0 parts of carbon fiber, 27 parts of low-melting-point alloy phase-change microspheres, 271 parts of water and 1 part of polycarboxylate superplasticizer.
The preparation method is the same as in example 1.
Example 5
The low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material comprises the following raw materials in parts by weight:
678 parts of Portland cement, 1356 parts of river sand, 2.0 parts of carbon fiber, 54 parts of low-melting-point alloy phase-change microspheres, 270 parts of water and 1.4 parts of polycarboxylate superplasticizer.
The preparation method is the same as in example 1.
Example 6
The low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material comprises the following raw materials in parts by weight:
675 parts of Portland cement, 1350 parts of river sand, 2.0 parts of carbon fiber, 81 parts of low-melting-point alloy phase-change microspheres, 269 parts of water and 1.7 parts of polycarboxylate superplasticizer.
The preparation method is the same as in example 1.
Comparative example 1
The cement-based composite material comprises the following raw materials in parts by weight:
685 parts of Portland cement, 1370 part of river sand, 0 part of carbon fiber, 0 part of low-melting-point alloy phase-change microspheres, 274 parts of water and 0.7 part of polycarboxylate superplasticizer.
The preparation method is the same as in example 1.
Comparative example 2
The cement-based composite material comprises the following raw materials in parts by weight:
684 parts of silicate cement, 1368 parts of river sand, 2.0 parts of carbon fiber, 0 part of low-melting-point alloy phase-change microspheres, 273 parts of water and 1.0 part of polycarboxylate water reducer.
The preparation method is the same as in example 1.
Comparative example 3
The cement-based composite material comprises the following raw materials in parts by weight:
680 parts of silicate cement, 1360 part of river sand, 0 part of carbon fiber, 54 parts of low-melting-point alloy phase-change microspheres, 271 parts of water and 1.0 part of polycarboxylate superplasticizer.
The preparation method is the same as in example 1.
And (3) performance detection:
the cement-based composites of examples 1-6 and comparative examples 1-3 above were tested to determine mainly a 3d semi-adiabatic hydration temperature rise curve, 28d flexural strength, 28d thermal conductivity and thermal diffusivity. Tables 1 and 2 below list the test results of examples 1-6 and comparative examples 1-3, respectively, described above.
TABLE 1 semi-adiabatic hydration temperature rise test results for cement-based composites of examples 1-6 and comparative examples 1-3
| Numbering device | In-mold temperature/(DEGC) | Peak temperature/(. Degree.C) | Temperature rise/(. Degree.C) | Cumulative heat of hydration/(h. Degree C) |
| Example 1 | 20.2 | 71.2 | 51.0 | 915.8 |
| Example 2 | 20.2 | 68.9 | 48.7 | 855.4 |
| Example 3 | 20.4 | 64.5 | 44.1 | 818.6 |
| Example 4 | 20.3 | 70.8 | 50.5 | 904.5 |
| Example 5 | 20.3 | 67.4 | 47.1 | 835.1 |
| Example 6 | 20.3 | 62.6 | 42.3 | 789.3 |
| Comparative example 1 | 20.2 | 74.7 | 54.5 | 1010.1 |
| Comparative example 2 | 20.2 | 73.8 | 53.6 | 988.9 |
| Comparative example 3 | 20.3 | 69.7 | 49.4 | 877.2 |
TABLE 2 results of 28d flexural Strength, thermal conductivity and thermal diffusivity tests for Cement-based composites of examples 1-6 and comparative examples 1-3
From the results of tables 1 and 2 above, it can be seen that examples 1 to 6 of the present invention can significantly reduce the temperature rise and the accumulated hydration heat release of the cement-based composite material while significantly improving the flexural strength, the thermal conductivity and the thermal diffusivity by changing the specific gravities of the carbon fiber and the low-melting alloy phase-change microspheres by utilizing the synergistic effect of the carbon fiber and the low-melting alloy phase-change microspheres when compared with the comparative examples. When the specific gravity of the carbon fiber and the low-melting point alloy phase-change microspheres is increased, the degree of decrease in the temperature rise and accumulated hydration heat of the cement composite material is increased, and the degree of increase in the thermal conductivity and thermal diffusivity is also increased. Among the examples, example 6 has the lowest temperature rise, the highest thermal conductivity and the thermal diffusivity. In addition, too much low melting point metal is disadvantageous for improving the flexural strength of the cement-based composite material, wherein example 5 shows the most remarkable flexural strength improving effect.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The cement-based composite material with low temperature rise, high heat conduction and high crack resistance is characterized by comprising the following raw materials in parts by weight: 655-685 parts of silicate cement, 1300-1380 parts of river sand, 0.5-2.5 parts of carbon fiber, 26-83 parts of low-melting-point alloy phase-change microspheres, 260-275 parts of water and 0.6-1.8 parts of polycarboxylate water reducer.
2. The cement-based composite material of claim 1, comprising the following raw materials in parts by weight: 660-680 parts of silicate cement, 1300-1360 parts of river sand, 0.5-2 parts of carbon fiber, 26-83 parts of low-melting-point alloy phase-change microspheres, 260-275 parts of water and 1-1.8 parts of polycarboxylate water reducer.
3. The cement-based composite material according to claim 1 or 2, wherein the portland cement is PII-52.5 grade ordinary portland cement.
4. The cement-based composite material according to claim 1 or 2, wherein the river sand has a fineness modulus of 2.6-2.9 and a particle diameter of 0.08-2mm.
5. The cement-based composite material according to claim 1 or 2, wherein the carbon fiber has a thermal conductivity of 640W/m-K, a filament diameter of 8-12 μm and an aspect ratio of 10-20:1.
6. The cement-based composite material according to claim 1 or 2, wherein the low-melting point alloy phase-change microspheres are polyvinyl alcohol coated indium-bismuth-tin alloy, the particle size of the low-melting point alloy phase-change microspheres is 10-80 μm, the melting point is 62.6 ℃, and the volume potential value is 214MJ/m 3 。
7. Cement-based composite material according to claim 1 or 2, characterized in that the polycarboxylate water reducer has a solid content of 40% by weight or more and a water reduction rate of 33.9% or more.
8. A method of preparing a cement-based composite material as claimed in any one of claims 1 to 7, comprising the steps of:
(1) Mixing carbon fiber, a water reducing agent and water, and performing ultrasonic treatment to obtain a carbon fiber suspension;
(2) Uniformly stirring silicate cement and low-melting-point alloy phase-change microspheres at a low speed to obtain a mixed dry material;
(3) Adding river sand into the mixed dry material obtained in the step (2), and uniformly stirring at a low speed to obtain a mixture;
(4) And (3) pouring the carbon fiber suspension obtained in the step (1) into the mixture obtained in the step (3), and stirring at a low speed and then at a high speed to obtain the low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material.
9. The method according to claim 8, wherein in the step (1), the ultrasonic power is 120-140W and the ultrasonic time is 8-10min.
10. The method according to claim 8, wherein the equipment used for stirring in the steps (2), (3) and (4) is a standard planetary cement mortar stirrer.
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