CN113087464A - Water-based high-toughness sidewalk for visually impaired people mortar, preparation method and sidewalk for visually impaired people brick - Google Patents
Water-based high-toughness sidewalk for visually impaired people mortar, preparation method and sidewalk for visually impaired people brick Download PDFInfo
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- CN113087464A CN113087464A CN202110341217.9A CN202110341217A CN113087464A CN 113087464 A CN113087464 A CN 113087464A CN 202110341217 A CN202110341217 A CN 202110341217A CN 113087464 A CN113087464 A CN 113087464A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000011449 brick Substances 0.000 title claims description 12
- 230000001771 impaired effect Effects 0.000 title description 7
- 229920001971 elastomer Polymers 0.000 claims abstract description 56
- 239000005060 rubber Substances 0.000 claims abstract description 56
- 229920002635 polyurethane Polymers 0.000 claims abstract description 55
- 239000004814 polyurethane Substances 0.000 claims abstract description 55
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 53
- 239000000843 powder Substances 0.000 claims abstract description 51
- 239000011398 Portland cement Substances 0.000 claims abstract description 44
- 239000006004 Quartz sand Substances 0.000 claims abstract description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 239000008399 tap water Substances 0.000 claims description 5
- 235000020679 tap water Nutrition 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 12
- 239000004567 concrete Substances 0.000 description 10
- 239000004568 cement Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Classifications
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
-
- 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
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/82—Coloured 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses water-based high-toughness sidewalk for the blind, a preparation method and a sidewalk for the blind. The water-based high-toughness sidewalk for the blind is formed by the following raw materials: 40-65 parts of Portland cement, 35-60 parts of quartz sand, 0.1-0.5 part of water reducing agent, 1-6 parts of polyurethane, 2-6 parts of rubber powder, 3-7 parts of color paste and 22-32 parts of water. The blind road prepared by the blind road mortar provided by the invention has high strength and good toughness.
Description
Technical Field
The invention relates to water-based high-toughness sidewalk for the blind, a preparation method and a sidewalk for the blind.
Background
With the continuous development of the personal authority cause of China, the social care for the disabled is more and more, for the special disabled, in order to improve the travel of the blind, the road newly built in the city is required to be laid in the urban road and building barrier-free design specification officially issued in the beginning of the century in China, and the barrier-free facility construction acceptance and maintenance specification issued in 2011 provides a legal basis for the construction quality acceptance of the blind road.
At present, blind roads are laid on newly-built roads in large and medium-sized cities in China, and sections of old cities lacking blind roads are pushed forward timely. According to the material research of the road blind road in China, the current blind road on the road is mainly a precast concrete blind road and is supplemented with blind roads made of other materials such as stone, rubber, stainless steel and the like. For example, CN206956490U discloses a permeable concrete blind road tile, in which a plurality of round or rectangular protrusions are provided on the front face of the tile, and a plurality of conical protrusions are provided on the back face of the tile to prevent the tile from moving and falling off after being stressed. For another example, CN203270408U discloses a blind sidewalk brick consisting of a raised layer, a surface layer and a bottom layer, wherein the raised layer is made of rubber material and filled on the surface layer, the surface layer is made of cured material, and the bottom layer is made of common concrete material. The blind roads made of stone, rubber and stainless steel have the defects of high price, limited application range, difficult maintenance and the like, so that the large-scale application of the blind roads is limited, and the concrete blind roads become the mainstream in the current market. Although the concrete blind road has the advantages of low price, simple construction and the like, the concrete blind road often has potential defects: firstly, the wear-resistant rubber is not wear-resistant and is easy to damage, and the damaged rubber cannot be repaired; secondly, the texture is hard, and the bulges on the upper surface often become barriers of wheelchairs, baby carriages and lady high-heeled shoes.
Based on the concepts of ecological environmental protection and sustainable development, how to fully utilize the advantages of the price of the existing concrete blind road, and to develop and research a blind road material integrating cost performance, practicability and durability by using new materials and new technologies, solves the problems of poor wear resistance and toughness and the like of the existing concrete blind road, and has positive significance for the construction of the future urban blind road.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a water-based high toughness sidewalk for the blind. The blind road prepared by the blind road mortar provided by the invention has high strength and good toughness.
The invention also aims to provide a preparation method of the water-based high-toughness sidewalk for the blind. The method is simple in construction and easy to popularize on a large scale.
It is yet another object of the present invention to provide a blind sidewalk brick. The blind road brick has high strength, good toughness, high cost performance and wide market application prospect.
The invention adopts the following technical scheme to achieve the purpose.
On one hand, the invention provides water-based high-toughness sidewalk for the blind, which is formed by the following raw materials:
40-65 parts of Portland cement, 35-60 parts of quartz sand, 0.1-0.5 part of water reducing agent, 1-6 parts of polyurethane, 2-6 parts of rubber powder, 3-7 parts of color paste and 22-32 parts of water.
The water-based high-toughness sidewalk for the blind is preferably formed by the following raw materials:
45-60 parts of Portland cement, 40-55 parts of quartz sand, 0.2-0.4 part of water reducing agent, 2-5 parts of polyurethane, 3-5 parts of rubber powder, 4-6 parts of color paste and 27-30 parts of water.
The water-based high-toughness sidewalk for the blind is preferably formed by the following raw materials:
60 parts of Portland cement, 40 parts of quartz sand, 0.4 part of water reducing agent, 5 parts of polyurethane, 3 parts of rubber powder, 4 parts of color paste and 28 parts of water;
or 55 parts of Portland cement, 45 parts of quartz sand, 0.2 part of water reducing agent, 4 parts of polyurethane, 3 parts of rubber powder, 4 parts of color paste and 27 parts of water;
or 45 parts of Portland cement, 55 parts of quartz sand, 0.2 part of water reducing agent, 2 parts of polyurethane, 5 parts of rubber powder, 4 parts of color paste and 30 parts of water.
According to the water-based high-toughness blind-road mortar disclosed by the invention, the strength grade of the portland cement is preferably not lower than 42.5 grade; the fineness of the quartz sand is 10-100 meshes.
According to the water-based high-toughness sidewalk for the blind, the water reducing agent is preferably a lignin water reducing agent, a naphthalene water reducing agent, a melamine water reducing agent or a polycarboxylic acid water reducing agent.
According to the water-based high-toughness sidewalk for the blind, the polyurethane is preferably one-component water-based polyurethane, and the solid content is 20-50 wt%.
According to the water-based high-toughness sidewalk for the blind, the rubber powder is preferably white rubber powder which is prepared by grinding waste soles through the processes of crushing, grinding, dust absorption and screening; the color paste is medium yellow color paste; the water is pure tap water.
According to the water-based high-toughness blind-road mortar disclosed by the invention, preferably, the portland cement is white portland cement, the strength grade is not lower than 42.5 grade, and the specific surface area is 350-500 m2The initial setting time is more than or equal to 40min, and the final setting time is less than or equal to 390 min;
SiO in the quartz sand2The content is more than or equal to 99.5 wt%, the mud content is less than 0.5 wt%, the ignition loss is less than 0.5 wt%, and the fineness is 40-80 meshes;
the water reducing agent is a powdery polycarboxylic acid type water reducing agent, the water reducing rate is more than or equal to 35 percent, and the compressive strength ratio is more than or equal to 120 percent;
the polyurethane is one-component waterborne polyurethane, the solid content is 30-35 wt%, the pH value is 6-8 at 25 ℃, the surface drying time is less than or equal to 4h, the tensile strength at 25 ℃ is more than or equal to 1.65Mpa, and no crack is generated at the low temperature of-35 ℃;
the rubber powder is white rubber powder which is prepared by grinding waste soles through crushing, grinding, dust absorption and screening processes, the fineness of the white rubber powder is 80-120 meshes, and the density of the white rubber powder is 1.1-1.3 g/cm3；
The color paste is medium yellow color paste, the viscosity of the color paste is less than 110KU, the fineness is less than 25 μm, the color difference delta E is less than or equal to 1, the light resistance is more than or equal to 7, and the weather resistance is more than or equal to 4 grade.
In another aspect, the invention provides a preparation method of the water-based high-toughness blind road mortar, which comprises the following steps:
after the component a is mixed for 10-60 s, adding the component b with the weight of 2/3 and mixing for 30-90 s, then adding the component c and continuing mixing for 30-90 s, and finally adding the remaining component b with the weight of 1/3 and mixing for 20-80 s to obtain the water-based high-toughness sidewalk for the blind;
wherein, the component a comprises portland cement, quartz sand, a water reducing agent, polyurethane and rubber powder, the component b comprises water, and the component c comprises color paste.
In another aspect, the invention provides a blind road brick, which is made of the blind road mortar or the blind road mortar prepared by the method.
The superfine white rubber powder is added into the blind road mortar, so that the toughness of the blind road mortar is effectively improved; and the high-molecular waterborne polyurethane is introduced, so that the interface bonding of the rubber powder particles and the cement stone particles is improved along with the later strength formation of the polyurethane, and the prepared blind road mortar has good strength and toughness.
The strength forming mechanism of the blind road mortar is divided into two parts: firstly, silicate cement in the mixture is hydrolyzed under the action of water (added water and solvent water in partial polyurethane) to form a set cement structure; and secondly, the added waterborne polyurethane is added, because the moisture in the waterborne polyurethane is evaporated, the interval of emulsion particles is gradually reduced, the protective layer adsorbed on the surface of the polymer emulsion particles is damaged to form capillaries, the emulsion particles are forced to deform and disappear by the capillary action, polymers in the emulsion particles in a coil shape are close to each other, the chain ends are mutually diffused, coil structures are mutually fused, and finally a continuous polymer coating is formed. The strength of the blind road mortar is the composite strength formed by mutually interlacing and winding the portland cement and the waterborne polyurethane.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
In the present invention, "wt%" means weight percent.
The water-cement ratio in the invention refers to the ratio of water consumption per cubic meter of concrete to the consumption of all cementing materials.
< sidewalk for visually impaired people mortar >
The invention provides water-based high-toughness sidewalk for the blind, which is formed by the following raw materials:
40-65 parts of Portland cement, 35-60 parts of quartz sand, 0.1-0.5 part of water reducing agent, 1-6 parts of polyurethane, 2-6 parts of rubber powder, 3-7 parts of color paste and 22-32 parts of water.
In certain embodiments, the aqueous high toughness blind-road mortar is formed from raw materials comprising:
45-60 parts of Portland cement, 40-55 parts of quartz sand, 0.2-0.4 part of water reducing agent, 2-5 parts of polyurethane, 3-5 parts of rubber powder, 4-6 parts of color paste and 27-30 parts of water.
According to a preferred embodiment of the present invention, the aqueous high toughness blind road mortar is formed from raw materials comprising:
60 parts of Portland cement, 40 parts of quartz sand, 0.4 part of water reducing agent, 5 parts of polyurethane, 3 parts of rubber powder, 4 parts of color paste and 28 parts of water.
According to another preferred embodiment of the present invention, the aqueous high toughness blind road mortar is formed from raw materials comprising:
55 parts of Portland cement, 45 parts of quartz sand, 0.2 part of water reducing agent, 4 parts of polyurethane, 3 parts of rubber powder, 4 parts of color paste and 27 parts of water.
According to a further preferred embodiment of the present invention, the aqueous high toughness blind-road mortar is formed from raw materials comprising:
45 parts of Portland cement, 55 parts of quartz sand, 0.2 part of water reducing agent, 2 parts of polyurethane, 5 parts of rubber powder, 4 parts of color paste and 30 parts of water.
In the blind mortar of the invention, all the raw materials are known substances, and can be obtained by commercial purchase or preparation by methods known in the art. The raw materials used in the invention have rich sources and low cost. The blind road mortar prepared by adopting the raw materials with the specific mixture ratio has excellent fluidity, compressive strength, breaking strength, wear resistance and fracture energy.
In the invention, the strength grade of the Portland cement is not lower than 42.5, such as 42.5, 52.5 or 62.5 Portland cement; preferably, the portland cement is white portland cement, the strength grade is not lower than 42.5 grade, and the specific surface area is 350-500 m2The initial setting time is more than or equal to 40min and the final setting time is less than or equal to 390 min. More preferably, the portland cement has a strength grade of 42.5 and a specific surface area of 480m2And/kg, the initial setting time is 70min, and the final setting time is 360 min. The Portland cement with proper strength grade and physical and chemical parameters can be selected to improveStrength of the blind road mortar.
In the invention, the fineness of the quartz sand is 10-100 meshes; preferably, the fineness of the quartz sand is 40-80 meshes and SiO is2The content is more than or equal to 99.5 wt%, the mud content is less than 0.5 wt%, and the ignition loss is less than 0.5 wt%; more preferably, the fineness of the quartz sand is 40-80 meshes and SiO is2The content is 99.8 wt%, the mud content is 0.1 wt%, and the ignition loss is 0.2 wt%. The quartz sand limited by the parameters is selected, so that the prepared blind road mortar has both strength and wear resistance.
In the invention, the water reducing agent can adopt lignin water reducing agent, naphthalene water reducing agent, melamine water reducing agent or polycarboxylic acid water reducing agent commonly used in the field; preferably a polycarboxylic acid type water reducing agent; more preferably a powdery polycarboxylic acid type water reducing agent, the water reducing rate is more than or equal to 35 percent, and the compressive strength ratio is more than or equal to 120 percent. By adopting the water reducing agent, the using amount of water in the mortar can be reduced, and the water retention performance of the mortar is improved. And when the blind road is laid, the water reducing agent can improve the density of the blind road structure and achieve the effects of cracking resistance and water resistance.
In the invention, the polyurethane is single-component waterborne polyurethane, and the solid content is 20-50 wt%; preferably, the polyurethane is one-component waterborne polyurethane, the solid content is 30-35 wt%, the pH value is 6-8 at 25 ℃, the surface drying time is less than or equal to 4h, the tensile strength at 25 ℃ is more than or equal to 1.65Mpa, and no crack is generated at the low temperature of-35 ℃; more preferably, the polyurethane is one-component waterborne polyurethane, the solid content is 35 wt%, the pH value is 7 at 25 ℃, the surface drying time is 3.4h, the tensile strength at 25 ℃ is more than or equal to 2.15Mpa, and no crack is generated at the low temperature of-35 ℃. The invention introduces the high-molecular waterborne polyurethane, the high-molecular waterborne polyurethane is uniformly filled in the mixture under full stirring, the interface bonding of rubber powder particles and cement stone particles is improved along with the formation of the later strength of the polyurethane, and the waterborne polyurethane is a high-strength high-toughness material, so that the prepared blind road mortar has good strength and toughness.
In the invention, the rubber powder is white rubber powder which is prepared by grinding waste soles through crushing, grinding, dust absorption and screening processes; preferably, the fineness of the rubber powder is 80-120 meshes, and the density is 1.1-1.3 g/cm3(ii) a More preferably, the fineness of the rubber powder120 mesh, density 1.15g/cm3. The added white rubber powder has excellent elasticity and toughness, is superfine rubber powder, can be fully and uniformly distributed in the mixture, and can effectively improve the toughness of the blind road mortar.
In the invention, the color paste is medium yellow color paste; preferably, the color paste is medium yellow color paste, the viscosity of the color paste is less than 110KU, the fineness is less than 25 μm, the color difference delta E is less than or equal to 1, the light resistance is more than or equal to 7, and the weather resistance is more than or equal to level 4; more preferably, the color paste is a medium yellow color paste obtained by fully mixing iron yellow color paste and iron red color paste according to the mass ratio of 100:3, the viscosity of the color paste is 85KU, the fineness is 23 μm, the color difference delta E is 0.8, the light resistance is 7, and the weather resistance is level 4. The color paste is added into the blind road mortar raw material, so that the prepared blind road mortar has pure color and the prepared blind road brick is beautiful and elegant.
In the invention, the water is tap water or drinking water, and is preferably pure tap water as long as the requirement of concrete water standard (JGJ63-2006) is met.
< preparation method >
The preparation method of the water-based high-toughness sidewalk for the blind comprises the following steps:
after the component a is mixed for 10-60 s, adding the component b with the weight of 2/3 and mixing for 10-100 s, then adding the component c and continuing to mix for 10-100 s, and finally adding the remaining component b with the weight of 1/3 and mixing for 10-80 s to obtain the water-based high-toughness blind road mortar;
wherein, the component a comprises portland cement, quartz sand, a water reducing agent, polyurethane and rubber powder, the component b comprises water, and the component c comprises color paste.
The mass ratio of the Portland cement to the quartz sand to the water reducing agent to the polyurethane to the glue powder to the color paste to the water can be 40-65: 35-60: 0.1-0.5: 1-6: 2-6: 3-7: 22 to 32. In certain embodiments, the mass ratio of the portland cement, the quartz sand, the water reducing agent, the polyurethane, the rubber powder, the color paste and the water is 45-60: 40-55: 0.2-0.4: 2-5: 3-5: 4-6: 27 to 30. According to a preferred embodiment of the invention, the mass ratio of the portland cement, the quartz sand, the water reducing agent, the polyurethane, the rubber powder, the color paste and the water is 60: 40: 0.4: 5: 3: 4: 28. according to another preferred embodiment of the invention, the mass ratio of the portland cement, the quartz sand, the water reducing agent, the polyurethane, the rubber powder, the color paste and the water is 55: 45: 0.2: 4: 3: 4: 27. according to another preferred embodiment of the invention, the mass ratio of the portland cement, the quartz sand, the water reducing agent, the polyurethane, the rubber powder, the color paste and the water is 45: 55: 0.2: 2: 5: 4: 30. the blind road mortar prepared by adopting the raw materials in the specific dosage relation range has excellent fluidity, compressive strength, breaking strength, wear resistance and fracture energy.
The component a is mixed for 10 to 60 seconds, preferably 15 to 50 seconds, and more preferably 20 to 30 seconds. And then adding 2/3 weight of the component b and mixing for 30-90 s, preferably 40-80 s, and more preferably 50-60 s. And adding the component c, and continuously stirring for 30-90 s, preferably 40-80 s, and more preferably 50-60 s. Finally, the component b with the residual 1/3 weight is added and mixed for 20-80 s, preferably 30-60 s, and more preferably 40-50 s. The above-mentioned mixing may be carried out by a conventional mixing apparatus in the art, and is not particularly limited, for example, by a planetary mixer. By adopting the mixing time, the mixture can be fully mixed, and the strength of the blind road mortar is improved.
< blind road brick >
The blind road brick is prepared from the blind road mortar or the blind road mortar prepared by the method. The blind road bricks are generally rectangular parallelepiped structures, and the specifications can be 300 × 20mm, 400 × 25mm, 300 × 400 × 23mm, 298 × 20mm, 299 × 24mm, 398 × 25mm, 399 × 26mm and the like, and can be specifically customized according to actual needs.
The blind road brick prepared by the blind road mortar can completely replace the prior blind road materials such as stone, cement, metal, plastic and the like from the aspects of product appearance, practicability and the like, and has pure and striking color and elegant appearance. And has the characteristics of high wear resistance, good toughness, long service life and the like.
The following examples, comparative examples and experimental examples use the starting materials.
Cement: an "albobo" brand PW-1 type white portland cement manufactured by albobobo blue (Anqing) Co. The cement has a strength grade of 42.5 and a specific surface areaIs 480m2The initial setting time is 70min, the final setting time is 360min, the 3d compressive strength and the flexural strength are respectively 18.9Mpa and 4.2Mpa, and the 28d compressive strength and the flexural strength are respectively 45.8Mpa and 7.2 Mpa.
Quartz sand: white quartz sand marketed by Chongqing Ruihe commerce and trade company Limited. Wherein, SiO2The content is 99.8 wt%, the mud content is 0.1 wt%, the ignition loss is 0.2 wt%, and the fineness is 40-80 meshes.
Water reducing agent: the special powdery polycarboxylate type water reducing agent for the sulphoaluminate cement sold by Shanghai Yunlong industries and Co., Ltd is PC-0305, the water reducing rate is 36%, and the concrete compressive strength ratio is 125%.
Polyurethane: the water-based polyurethane sold by Jiangsu Xintai materials science and technology limited company has the product model of 300C, the solid content of 35 wt%, the pH value of 7 at the temperature of 25 ℃, the surface drying time of 3.4h, the tensile strength of 2.15Mpa at the temperature of 25 ℃ and no crack at the temperature of 35 ℃ below zero.
Rubber powder: white rubber powder HJ-120 sold by Xiamen Hongjin commerce Limited company, with the fineness of 120 meshes and the density of 1.15g/cm3。
Color paste: iron yellow color paste (product code 9208) and iron red color paste (product code 9113) sold by Fushan Yimei beautifying industry Co., Ltd are fully mixed according to the mass ratio of 100:3 to obtain the medium yellow color paste. The viscosity of the color paste is 85KU, the fineness is 23 μm, the color difference delta E is 0.8, the light resistance is 7, and the weather resistance is 4 grades.
Water: pure tap water.
The special material for the blind road mortar: the material is special for the sidewalk for the blind in the market of Jiangsu good border ecological engineering technology company Limited.
Example 1
The preparation method of the water-based high-toughness blind road mortar comprises the following steps:
1) according to the mass ratio of 60: 40: 0.4: 5: 3: 4: 0.28 weighing portland cement, quartz sand, a water reducing agent, polyurethane, rubber powder, color paste and water, wherein the portland cement, the quartz sand, the water reducing agent, the polyurethane and the rubber powder are taken as a component a, the water is taken as a component b, and the color paste is taken as a component c;
2) and (3) mixing the component a for 30s by using a planetary mixer, adding the component b with the weight of 2/3 and mixing for 50s, then adding the component c and continuing to mix for 50s, and finally adding the component b with the remaining weight of 1/3 and mixing for 35s to obtain the water-based high-toughness sidewalk for visually impaired people. See table 1 for details.
When the water-based high-toughness blind road mortar is used for blind road construction, firstly, dust and oil stains on the surface of a part to be paved are cleaned, the cleanness and the dryness of a base surface are ensured, and the base surface is pre-wetted; placing the blind road template close to the base surface, pouring the blind road mortar into the template groove, scraping and collecting the redundant mortar on the surface by using a scraper, standing for 5min, and then demolding; and finally, covering a plastic film on the blind road strip for curing for 7d, thus forming the high-strength, high-toughness and wear-resistant road blind road.
Examples 2 to 3
The conditions were the same as in example 1 except that the amount ratio of portland cement, quartz sand, water reducing agent, polyurethane, rubber powder, color paste, and water was different from that in example 1. See table 1 for details.
Comparative example 1
Except that the dosage ratio of the portland cement, the quartz sand, the water reducing agent, the color paste and the water is different from that of the embodiment 1, the rubber powder and the polyurethane are not added, other conditions are the same as the embodiment 1, and the flow degree of the blind road mortar prepared by the invention and the blind road mortar prepared by the embodiment 1 is the same. See table 1 for details.
Comparative example 2
The preparation method of the blind road mortar of the comparative example comprises the following steps: ordinary portland cement with the strength grade of 42.5, the special material for the blind road mortar and water are uniformly mixed by a planetary mixer to obtain the blind road mortar. Wherein the mass ratio of the ordinary Portland cement to the special material for the blind road mortar is 1:1.5, and the water-cement ratio is 0.60. See table 1 for details.
TABLE 1 Mass ratios of the blind road mortars of examples 1 to 3 and comparative examples 1 to 2
Examples of the experiments
In order to compare the application effects of the blind road mortar prepared in the embodiment of the invention and the comparative example, indexes of the blind road mortar, such as flowability, compressive strength, breaking strength, wear resistance, fracture energy and the like, are tested.
1. Experimental methods
1) Fluidity: a method for measuring fluidity of cement mortar (GBT 2419-.
2) Compression/rupture strength: a method for testing the compression strength and the rupture strength of cement mortar in a cement mortar strength test method (GB/T17671-1999).
3) Wear resistance: 15.5 abrasion resistance test method in IS 9162-1979 specification.
4) Breaking energy: a three-point bending beam test is adopted, and fracture energy is calculated to reflect the toughness of the mortar, and the test method comprises the following steps:
4.1) preparation work
Preparing a 40mm multiplied by 160mm blind road mortar test piece, curing for 1d, demoulding, curing in water at 20 +/-1 ℃ for 5d, taking out the middle part of the test piece, processing a notch by using a saw blade, and determining that the cutting height ratio is 0.5mm and the notch width is about 1 mm.
4.2) test procedure
The test piece is placed on a three-point bending test frame of the testing machine, the span is 150mm, a Japanese Shimadzu DSS-25T high-precision universal testing machine is started, loading is carried out in a stable displacement loading control mode, the loading speed is 0.05mm/min, the curve of load-deflection (P-delta) is recorded, and the load slowly returns to the zero point after the test is finished.
4.3) result processing
And calculating the area enclosed by the stress-strain curve when the stress ranges from 0 → the maximum stress in the test process by adopting a formula provided by Petersson, wherein the area is the fracture energy of the test piece. Calculating the formula:
wherein:
h-specimen height;
a-specimen cut depth;
b-specimen width;
m is the specimen mass;
p-load;
delta-deformation.
2. Results of the experiment
As can be seen from Table 2, the test indexes of the blind road mortar prepared in the embodiments 1-3 of the invention are all similar. Compared with the examples 1-3, the blind road mortar prepared in the comparative example 1 only has poor toughness, and other indexes are equivalent. The indexes of the sidewalk for visually impaired people mortar prepared in comparative example 2 are all lower than those of examples 1-3. The introduction of the waterborne polyurethane and the rubber powder in the invention greatly improves the flexibility of the blind road mortar while ensuring that the mechanical property is not reduced, and the application durability and the walking comfort of the blind road mortar are improved when the blind road mortar is expected to be applied to the road blind road, so that the application prospect is wide.
TABLE 2 comparison of technical Performance indicators
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.
Claims (10)
1. The water-based high-toughness sidewalk for the blind is characterized by being formed by the following raw materials:
40-65 parts of Portland cement, 35-60 parts of quartz sand, 0.1-0.5 part of water reducing agent, 1-6 parts of polyurethane, 2-6 parts of rubber powder, 3-7 parts of color paste and 22-32 parts of water.
2. The aqueous high-toughness blind-road mortar according to claim 1, which is formed from raw materials comprising:
45-60 parts of Portland cement, 40-55 parts of quartz sand, 0.2-0.4 part of water reducing agent, 2-5 parts of polyurethane, 3-5 parts of rubber powder, 4-6 parts of color paste and 27-30 parts of water.
3. The aqueous high-toughness blind-road mortar according to claim 2, which is formed from raw materials comprising:
60 parts of Portland cement, 40 parts of quartz sand, 0.4 part of water reducing agent, 5 parts of polyurethane, 3 parts of rubber powder, 4 parts of color paste and 28 parts of water;
or 55 parts of Portland cement, 45 parts of quartz sand, 0.2 part of water reducing agent, 4 parts of polyurethane, 3 parts of rubber powder, 4 parts of color paste and 27 parts of water;
or 45 parts of Portland cement, 55 parts of quartz sand, 0.2 part of water reducing agent, 2 parts of polyurethane, 5 parts of rubber powder, 4 parts of color paste and 30 parts of water.
4. The aqueous high-toughness blind road mortar according to any one of claims 1 to 3, wherein the strength grade of the portland cement is not lower than 42.5; the fineness of the quartz sand is 10-100 meshes.
5. The aqueous high-toughness sidewalk for the blind as claimed in any one of claims 1 to 3, wherein the water reducing agent is a lignin water reducing agent, a naphthalene water reducing agent, a melamine water reducing agent or a polycarboxylic acid water reducing agent.
6. The aqueous high-toughness blind road mortar according to any one of claims 1 to 3, wherein the polyurethane is one-component aqueous polyurethane, and the solid content is 20-50 wt%.
7. The water-based high-toughness sidewalk for the blind as claimed in any one of claims 1 to 3, wherein the rubber powder is white rubber powder prepared by grinding waste soles through crushing, grinding, dust absorption and screening processes; the color paste is medium yellow color paste; the water is pure tap water.
8. The water-based high-toughness blind road mortar according to claim 1, wherein the portland cement is white portland cement, the strength grade is not lower than 42.5 grade, and the specific surface area is 350-500 m2The initial setting time is more than or equal to 40min, and the final setting time is less than or equal to 390 min;
SiO in the quartz sand2The content is more than or equal to 99.5 wt%, the mud content is less than 0.5 wt%, the ignition loss is less than 0.5 wt%, and the fineness is 40-80 meshes;
the water reducing agent is a powdery polycarboxylic acid type water reducing agent, the water reducing rate is more than or equal to 35 percent, and the compressive strength ratio is more than or equal to 120 percent;
the polyurethane is one-component waterborne polyurethane, the solid content is 30-35 wt%, the pH value is 6-8 at 25 ℃, the surface drying time is less than or equal to 4h, the tensile strength at 25 ℃ is more than or equal to 1.65Mpa, and no crack is generated at the low temperature of-35 ℃;
the rubber powder is white rubber powder which is prepared by grinding waste soles through crushing, grinding, dust absorption and screening processes, the fineness of the white rubber powder is 80-120 meshes, and the density of the white rubber powder is 1.1-1.3 g/cm3；
The color paste is medium yellow color paste, the viscosity of the color paste is less than 110KU, the fineness is less than 25 μm, the color difference delta E is less than or equal to 1, the light resistance is more than or equal to 7, and the weather resistance is more than or equal to 4 grade.
9. A preparation method of the water-based high-toughness blind road mortar as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
after the component a is mixed for 10-60 s, adding the component b with the weight of 2/3 and mixing for 30-90 s, then adding the component c and continuing mixing for 30-90 s, and finally adding the remaining component b with the weight of 1/3 and mixing for 20-80 s to obtain the water-based high-toughness sidewalk for the blind;
wherein, the component a comprises portland cement, quartz sand, a water reducing agent, polyurethane and rubber powder, the component b comprises water, and the component c comprises color paste.
10. A blind sidewalk brick, which is prepared from the blind sidewalk mortar of any one of claims 1 to 8 or the blind sidewalk mortar prepared by the method of claim 9.
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Application publication date: 20210709 |