CN111606629A - Ice-melting anti-freezing solid phase change material pavement brick and preparation method thereof - Google Patents
Ice-melting anti-freezing solid phase change material pavement brick and preparation method thereof Download PDFInfo
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- CN111606629A CN111606629A CN202010518438.4A CN202010518438A CN111606629A CN 111606629 A CN111606629 A CN 111606629A CN 202010518438 A CN202010518438 A CN 202010518438A CN 111606629 A CN111606629 A CN 111606629A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/245—Methods or arrangements for preventing slipperiness or protecting against influences of the weather for preventing ice formation or for loosening ice, e.g. special additives to the paving material, resilient coatings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C15/00—Pavings specially adapted for footpaths, sidewalks or cycle tracks
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/04—Pavings made of prefabricated single units made of bricks
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a pavement brick made of ice-melting and anti-freezing solid phase change materials and a preparation method thereof, belonging to the technical field of pavement bricks, wherein the pavement brick comprises a base layer and a functional surface layer arranged on the top surface of the base layer; the functional surface layer comprises the raw materials of cement, quartz sand, a solid phase change material, water and an external doping agent. According to the pavement brick, the solid phase change material is added into the raw material of the functional surface layer, so that the pavement brick has the ice melting and anti-freezing effects, and the walking safety of people on the pavement brick is improved. Meanwhile, the preparation method of the pavement brick comprises the steps of base material preparation, fabric preparation and pavement brick preparation, and a vibration compaction method is adopted, so that the preparation method of the pavement brick has the advantages of simplicity and convenience in preparation and control, the production requirement is met, and meanwhile, in the base material preparation and the fabric preparation, the external doping agent and water are respectively mixed, so that the uniformity of raw material mixing is improved.
Description
Technical Field
The invention relates to the technical field of pavement bricks, in particular to a pavement brick made of a solid-phase-change material with ice melting and antifreezing functions and a preparation method thereof.
Background
In winter ice and snow, the pavement bricks of pedestrian roads in northern cities of China are easy to freeze due to snow fall, certain potential safety hazards are brought to people when people go out, and the travelling comfort of the pedestrians is influenced. If the snow-melting agent is used for melting the ice on the surface of the pavement brick, the pavement brick and the vegetation are damaged, and the environment is polluted. Therefore, under the condition of ice and snow in winter, how to eliminate the ice and snow on the surface of the pavement brick and improve the safety of people going out becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a pavement brick made of ice-melting and anti-freezing solid phase change material, which is characterized in that the solid phase change material is added into the raw material of the functional surface layer, so that the pavement brick has an ice-melting effect, and the walking safety of people on the pavement brick is improved.
The invention also aims to provide a preparation method of the ice-melting and anti-freezing solid phase change material pavement brick, which is simple in preparation method and convenient to control, reduces the conditions of snow fall and icing on the surface of the pavement brick in winter, and meets the production requirements.
The above object of the present invention is achieved by the following technical solutions:
a pavement brick made of ice-melting and anti-freezing solid phase change materials comprises a base layer and a functional surface layer arranged on the top surface of the base layer;
the functional surface layer comprises, by weight, 15-35% of cement, 40-65% of quartz sand, 0.1-15% of a solid phase change material, 5-10% of water and an external admixture, wherein the addition amount of the external admixture is 0.5-1% of the weight of the cement.
Through adopting above-mentioned technical scheme, add solid phase change material in the raw materials of function surface course, solid phase change material can unlimited repetitious usage, and still have and need not the container splendid attire, can direct machine-shaping's advantage, when the temperature at the pavior brick is close solid phase change material's phase transition point, solid phase change material takes place solid conversion simultaneously, and release a large amount of heats, utilize this heat to reduce the frozen condition of pavior brick surface appearance, and can also carry out effectual heat protection to the pavior brick, improve the freeze resistance on road surface. Meanwhile, the ice melting and anti-freezing effects of the pavement bricks are further improved through the synergistic effect of the raw materials. The pavior brick can be melted when in small snow in winter, and can reduce the icing condition on the surface of the pavior brick when in medium to large snow, thereby improving the safety of people walking on the pavior brick.
More preferably, the base layer comprises, by weight, 15-35% of cement, 55-80% of construction waste recycled aggregate, 5-15% of water, and an external admixture, wherein the addition amount of the external admixture is 0.5-1% of the weight of the cement.
By adopting the technical scheme, the construction waste recycled aggregate is added into the raw materials of the base layer, and the cement and the external admixture are added to be the cementing material, so that the waste utilization is realized, the use of quartz sand is reduced, and the advantage of use stability is also realized. Meanwhile, the construction waste recycled aggregate has higher specific heat capacity, can be matched with the functional surface layer to absorb external heat, and improves the using effect of the functional surface layer.
More preferably, the solid phase change material is a road ice melting and anti-freezing composite phase change material SPCM 6.
By adopting the technical scheme, the road ice-melting and anti-freezing composite phase change material SPCM6 has the characteristics of small expansion coefficient, small volume change, no supercooling and phase separation phenomena, no toxicity, no corrosion, no pollution, stable performance and long service life. Meanwhile, the phase change point of the road ice-melting and anti-freezing composite phase change material SPCM6 is 6 ℃, the latent heat is 130-140J/g, and the use effect of the solid phase change material is further improved.
More preferably, the admixture is a polycarboxylic acid high-performance water reducing agent.
By adopting the technical scheme, the polycarboxylic acid high-performance water reducing agent can obviously improve the compressive strength of the base layer and the functional surface layer of the pavement brick, and further improve the compressive strength of the pavement brick.
More preferably, the thickness of the functional surface layer is 5-8 mm.
More preferably, the thickness of the base layer is 55 to 92 mm.
Through adopting above-mentioned technical scheme, inject the thickness of functional surface layer, basic unit, improve pavior brick's performance and result of use.
More preferably, the particle size of the construction waste recycled aggregate is 0.075-8mm in continuous gradation.
By adopting the technical scheme, the particle size of the construction waste recycled aggregate is limited, so that the base material keeps good fluidity, and the paving brick is convenient to form.
More preferably, the quartz sand comprises 20-40 mesh black quartz sand and 40-80 mesh white quartz sand, and the weight ratio of the black quartz sand to the white quartz sand is 1: 1.
By adopting the technical scheme, the quartz sand is limited, so that the fabric keeps good fluidity, the compactness of the functional surface layer is increased, and the compressive strength of the pavement brick is improved.
The second aim of the invention is realized by the following technical scheme:
a preparation method of the ice-melting and anti-freezing solid phase change material pavement brick comprises the following steps:
base preparation
Respectively weighing the raw materials of the functional surface layer according to the weight percentage;
uniformly mixing water and an external doping agent to obtain a premix a;
adding cement into the construction waste recycled aggregate, uniformly stirring, then adding the premix a, and uniformly stirring to obtain a base material;
fabric preparation
Respectively weighing raw materials of the base layer according to the weight percentage;
uniformly mixing water and the external doping agent to obtain a premix b;
mixing cement and quartz sand, uniformly stirring, adding the premix b, uniformly stirring, adding the solid phase-change material, and uniformly stirring to obtain the fabric;
preparation of pavior brick
Putting the base material into a die, performing vibration prepressing on the base material, then laying the fabric on the surface of the base material, and performing vibration final pressing on the fabric and the base material together to obtain a primary finished product;
and maintaining the primary finished product to obtain the pavement brick.
By adopting the technical scheme, after the cement and the quartz sand are mixed, the premix b is added to form the water-based slurry, and the water-based slurry is mixed with the solid phase-change material, so that the solid phase-change material is prevented from directly contacting with water and influencing the performance of the solid phase-change material. The preparation method of the pavement brick has the advantages of simple preparation and convenient control by adopting a vibration compaction method, reduces the snow and ice on the surface of the pavement brick in winter, meets the production requirement, and improves the uniformity of raw material mixing by respectively mixing the admixture and water in the preparation of the base material and the preparation of the fabric.
More preferably, the stirring is performed by a stirrer, and the stirrer is a forced planetary stirrer.
By adopting the technical scheme, the base material and the fabric can be mixed conveniently.
In conclusion, the invention has the following beneficial effects:
firstly, the ice-melting and anti-freezing solid phase change material pavement brick disclosed by the application has the advantages that the solid phase change material is added into the raw material of the functional surface layer, so that the pavement brick has the ice-melting and anti-freezing effect, and the requirements of the pavement brick are met.
Secondly, building rubbish recycled aggregate is added into the raw materials of the base layer, cement is added, and an external additive is used as a cementing material, so that the waste utilization is realized, the use of quartz sand is reduced, and the base layer has the advantage of use stability. Meanwhile, the construction waste recycled aggregate has higher specific heat capacity, can be matched with a functional surface layer to absorb external heat, and improves the using effect of the pavement brick.
Thirdly, the solid phase change material is a road ice-melting and anti-freezing composite phase change material SPCM6, the phase change point of the road ice-melting and anti-freezing composite phase change material SPCM6 is 6 ℃, the latent heat is 130-140J/g, and the using effect of the pavement brick is improved.
And meanwhile, in the preparation of the base material and the preparation of the fabric, the admixture and the water are respectively mixed, so that the uniformity of raw material mixing is improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
Raw material contents (unit: wt%) of the functional surface layers in examples of Table 1
| Raw materials | Cement | Quartz sand | Solid phase change material | Water (W) | Total up to | Admixture (account for cement) |
| Example 1 | 35 | 45 | 10 | 10 | 100 | 0.5 |
| Example 2 | 35 | 45 | 10 | 10 | 100 | 0.7 |
| Example 3 | 35 | 45 | 10 | 10 | 100 | 1.0 |
| Example 4 | 35 | 40 | 15 | 10 | 100 | 1.0 |
| Example 5 | 35 | 50 | 5 | 10 | 100 | 1.0 |
| Example 6 | 35 | 54.9 | 0.1 | 10 | 100 | 1.0 |
| Example 7 | 35 | 47 | 10 | 8 | 100 | 1.0 |
| Example 8 | 35 | 50 | 10 | 5 | 100 | 1.0 |
| Example 9 | 20 | 60 | 10 | 10 | 100 | 1.0 |
| Example 10 | 15 | 65 | 10 | 10 | 100 | 1.0 |
Table 2 content of each raw material of base layer in example (unit: wt%)
| Raw materials | Cement | Construction waste recycled aggregate | Water (W) | Total up to | Admixture (account for cement) |
| Example 1 | 15 | 75 | 10 | 100 | 0.7 |
| Example 11 | 15 | 75 | 10 | 100 | 1.0 |
| Example 12 | 15 | 75 | 10 | 100 | 1.0 |
| Example 13 | 15 | 70 | 15 | 100 | 1.0 |
| Example 14 | 15 | 80 | 5 | 100 | 1.0 |
| Example 15 | 35 | 55 | 10 | 100 | 1.0 |
| Example 16 | 20 | 70 | 10 | 100 | 1.0 |
Raw materials
The cement is P.O42.5 Portland cement produced by Tangshanhong cement factory; the external admixture is selected from YD-A1 type polycarboxylic acid high-performance water reducing agent of Beijing Oriental Yida building materials Co.Ltd; the quartz sand is selected from Shijiazhuangyi building materials Co., Ltd, the quartz sand comprises black quartz sand and white quartz sand, the particle size of the black quartz sand is 20-40 meshes, the particle size of the white quartz sand is 40-80 meshes, and the weight ratio of the black quartz sand to the white quartz sand is 1: 1; the solid phase change material is selected from road ice melting and anti-freezing composite phase change material SPCM6 produced by Shanghai Confucian entropy new energy; the construction waste recycled aggregate is selected from concrete-red brick mixed construction solid waste treated by Beijing Tokyo Hua Cheng traffic construction Limited, and the particle size range of the construction waste recycled aggregate is 0.075-8mm in continuous gradation.
Example 1
The ice-melting and antifreezing solid phase change material pavement brick comprises a base layer and a functional surface layer arranged on the top surface of the base layer, wherein the raw material ratio of the functional surface layer is shown in table 1, and the raw material ratio of the base layer is shown in table 2.
A preparation method of the ice-melting and anti-freezing solid phase change material pavement brick comprises the following steps:
base preparation
Respectively weighing the raw materials of the functional surface layer;
uniformly mixing water and an external doping agent to obtain a premix a;
adding cement into the construction waste recycled aggregate, stirring for 10s, uniformly mixing, then adding the premix a, stirring for 90s, and uniformly mixing to obtain a base material;
fabric preparation
Respectively weighing raw materials of a base layer;
uniformly mixing water and the external doping agent to obtain a premix b;
mixing cement and quartz sand, stirring for 45s, uniformly mixing, adding premix b, stirring for 90s, uniformly mixing, adding a solid phase change material, stirring for 200s, and uniformly mixing to obtain a fabric;
preparation of pavior brick
Putting a base material into a mold, performing vibration pre-pressing on the base material, wherein the pre-pressing time is 1s, the vibration frequency is 1800r/min, then paving a layer of fabric on the surface of the base material, and performing vibration final pressing on the base material together with the base material, wherein the final pressing time is 2s, and the vibration frequency is 3600r/min to obtain a primary finished product;
and curing the primary finished product for 24 hours at the temperature of 25 ℃ and the humidity of 95%, then curing for 28 days at normal temperature, wherein the base material forms a base layer, the fabric forms a functional surface layer, and the pavement brick is obtained, wherein the thickness of the base layer is 74mm, and the thickness of the functional surface layer is 5 mm.
Wherein, the stirring adopts a stirrer for stirring, and the stirrer is a 1500L forced planetary stirrer provided by Kenile.
Examples 2 to 10
The ice-melting and antifreezing solid phase change material pavement brick has the difference from the embodiment 1 in the embodiment 2-10 that the raw material proportion of the functional surface layer is different, and the raw material proportion of the functional surface layer is shown in the table 1.
Examples 11 to 16
The ice-melting and antifreezing solid phase change material pavement brick has the difference between the embodiments 11-16 and the embodiment 9 that the raw material proportion of the base layer is different, and the raw material proportion of the base layer is shown in the table 2.
Example 17
The difference between the embodiment and the embodiment 16 is that the thicknesses of a base layer and a functional surface layer are different, the thickness of the base layer is 55mm, and the thickness of the functional surface layer is 5 mm.
Example 18
The difference between the embodiment and the embodiment 16 is that the thicknesses of a base layer and a functional surface layer are different, the thickness of the base layer is 92mm, and the thickness of the functional surface layer is 8 mm.
With respect to the pavior bricks of examples 1-18, samples of pavior bricks were prepared and tested for the following properties, the results of which are shown in Table 3.
Wherein, according to GB28635-2012 'concrete pavior brick', the 28d compressive strength, the wearability, the freeze resistance are detected.
The surface temperature difference is detected by an infrared thermal imaging thermometer, and the specific detection method comprises the following steps:
s1 preparation of control sample
The control sample differs from the pavement tile sample in that the control sample has only a base layer and no functional finish;
s2 temperature measurement of control sample
Randomly selecting five test points on the surface of the control sample, taking one test point as a central point, detecting the temperature of the selected test point under the condition that the temperature is 6 ℃, and taking the average value of the temperature as the surface temperature of the control sample;
s3 test temperature measurement of pavement bricks
Randomly selecting five test points on the surface of the pavement brick sample, taking one test point as a central point, detecting the temperature of the selected test point under the condition that the temperature is 6 ℃, and taking the average value of the test points as the surface temperature of the pavement brick sample;
and S4, the surface temperature difference is the difference between the surface temperature of the pavement brick sample and the surface temperature of the comparison sample.
TABLE 3 test results
| Detecting items | Compressive strength/(MPa) | Abrasion resistance/(mm) | Freezing tolerance/(%) | Surface temperature difference/(. degree.C.) |
| Example 1 | 35.1 | 35 | 9 | 4.4 |
| Example 2 | 35.1 | 33 | 9 | 4.4 |
| Example 3 | 35.5 | 33 | 9 | 4.3 |
| Example 4 | 35.3 | 38 | 8 | 5.0 |
| Example 5 | 35.4 | 33 | 9 | 3.1 |
| Example 6 | 35.2 | 33 | 9 | 1.0 |
| Example 7 | 35.3 | 31 | 9 | 4.4 |
| Example 8 | 35.6 | 34 | 10 | 4.6 |
| Example 9 | 35.3 | 29 | 9 | 4.5 |
| Example 10 | 35.2 | 36 | 11 | 4.6 |
| Example 11 | 38.7 | 29 | 8 | 4.6 |
| Example 12 | 44.4 | 29 | 4 | 4.5 |
| Example 13 | 43.5 | 29 | 3 | 4.5 |
| Example 14 | 35.2 | 29 | 12 | 4.6 |
| Example 15 | 41.5 | 29 | 8 | 4.6 |
| Example 16 | 45.3 | 29 | 4 | 4.5 |
| Example 17 | 47.8 | 29 | 4 | 4.7 |
| Example 18 | 40.2 | 29 | 4 | 4.2 |
As can be seen from Table 2, the surface temperature of the pavement brick is higher than that of the ordinary pavement brick under the same condition, and when snowfall in winter, the pavement brick has the effects of melting ice and preventing freezing, and the safety of people walking on the pavement brick is improved, and the pavement brick has the advantages that the compressive strength is 35.2-47.8MPa, the wear resistance is 29-38mm, the freezing resistance is 3-12%, and the surface temperature difference is 1.0-5.0 ℃.
From the comparative examples 3 to 6, it can be seen that the surface temperature difference increases with the increase of the addition amount of the solid phase change material in the functional surface layer raw material, and the surface temperature difference reaches 4.3 ℃ when the addition amount of the solid phase change material is 10%. By comparing example 3 with examples 7 to 8, it can be seen that the surface temperature difference slightly decreased as the amount of water added to the functional layer raw material was increased, and reached 4.3 ℃ when the amount of water added was 10%. From the comparison between examples 3 and 9 to 10, it can be seen that the surface temperature difference slightly decreased with the increase in the amount of cement added to the raw material for the functional surface layer, but the compressive strength slightly increased, and that the surface temperature difference reached 4.5 ℃ and the compressive strength was 35.3MPa at 20% cement addition.
From the comparison between examples 9 and 11 to 12, it can be seen that the surface temperature difference did not change much with the increase of the admixture in the base material, but the compressive strength increased, and that the compressive strength was 44.4MPa when the admixture was added in an amount of 1.0% by weight based on the weight of cement. From comparative examples 12 to 14, it can be seen that the surface temperature difference did not change much with increasing water in the base material, but the freezing resistance decreased continuously, and at a water addition amount of 10% by weight of cement, the freezing resistance reached 4%. From the comparison of examples 12 and 15 to 16, it can be seen that the surface temperature difference does not change much as the cement in the base material increases, but the compressive strength increases and then decreases, and when the addition amount of the cement is 20%, the compressive strength is 45.3 MPa.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The ice-melting and anti-freezing solid phase change material pavement brick is characterized in that: comprises a base layer and a functional surface layer arranged on the top surface of the base layer;
the functional surface layer comprises, by weight, 15-35% of cement, 40-65% of quartz sand, 0.1-15% of a solid phase change material, 5-10% of water and an external admixture, wherein the addition amount of the external admixture is 0.5-1% of the weight of the cement.
2. The ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 1, wherein: the base layer comprises, by weight, 15-35% of cement, 55-80% of construction waste recycled aggregate, 5-15% of water and an external admixture, wherein the addition amount of the external admixture is 0.5-1% of the weight of the cement.
3. The ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 1, wherein: the solid phase change material is road ice melting and anti-freezing composite phase change material SPCM 6.
4. The ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 1, wherein: the external admixture is a polycarboxylic acid high-performance water reducing agent.
5. The ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 1, wherein: the thickness of the functional surface layer is 5-8 mm.
6. The ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 1, wherein: the thickness of the base layer is 55-92 mm.
7. The ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 1, wherein: the particle size of the construction waste recycled aggregate is 0.075-8 mm.
8. The ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 1, wherein: the quartz sand comprises black quartz sand of 20-40 meshes and white quartz sand of 40-80 meshes, and the weight ratio of the black quartz sand to the white quartz sand is 1: 1.
9. A method for preparing the ice-melting and anti-freezing solid phase change material pavement brick as claimed in any one of claims 1 to 8, wherein the method comprises the following steps: the method comprises the following steps:
base preparation
Respectively weighing the raw materials of the functional surface layer according to the weight percentage;
uniformly mixing water and an external doping agent to obtain a premix a;
adding cement into the construction waste recycled aggregate, uniformly stirring, then adding the premix a, and uniformly stirring to obtain a base material;
fabric preparation
Respectively weighing raw materials of the base layer according to the weight percentage;
uniformly mixing water and the external doping agent to obtain a premix b;
mixing cement and quartz sand, uniformly stirring, adding the premix b, uniformly stirring, adding the solid phase-change material, and uniformly stirring to obtain the fabric;
preparation of pavior brick
Putting the base material into a die, performing vibration prepressing on the base material, then laying the fabric on the surface of the base material, and performing vibration final pressing on the fabric and the base material together to obtain a primary finished product;
and maintaining the primary finished product to obtain the pavement brick.
10. The preparation method of the ice-melting and anti-freezing solid phase change material pavement brick as claimed in claim 9, wherein the method comprises the following steps: the stirring is carried out by a stirrer which is a forced planetary stirrer.
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| CN202010518438.4A CN111606629A (en) | 2020-06-09 | 2020-06-09 | Ice-melting anti-freezing solid phase change material pavement brick and preparation method thereof |
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| CN202010518438.4A CN111606629A (en) | 2020-06-09 | 2020-06-09 | Ice-melting anti-freezing solid phase change material pavement brick and preparation method thereof |
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| CN202010518438.4A Pending CN111606629A (en) | 2020-06-09 | 2020-06-09 | Ice-melting anti-freezing solid phase change material pavement brick and preparation method thereof |
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| CN113356519A (en) * | 2021-06-25 | 2021-09-07 | 北京建工新型建材有限责任公司 | Ground stirring-free stone-filled concrete leveling construction process and ground leveling structure |
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