CN113563028A - Asphalt concrete for severe cold areas - Google Patents
Asphalt concrete for severe cold areas Download PDFInfo
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- CN113563028A CN113563028A CN202110939553.3A CN202110939553A CN113563028A CN 113563028 A CN113563028 A CN 113563028A CN 202110939553 A CN202110939553 A CN 202110939553A CN 113563028 A CN113563028 A CN 113563028A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/601—Agents for increasing frost resistance
-
- 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
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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
Abstract
The invention discloses asphalt concrete for severe cold areas, and relates to the technical field of building materials. The asphalt concrete comprises the following raw materials in parts by weight: cement: 60-80 parts of fly ash: 15-30 parts of macadam: 10-20 parts of petroleum asphalt: 8-12 parts of apatite mineral powder: 5-10 parts of cold-resistant agent: 3-10 parts of polycarboxylic acid water reducing agent: 3-7 parts of a stabilizer; the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate is 1: 3: 5: 2. the raw material premixing method comprises the following steps: (1) preparing the raw materials; (2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent; (3) and cooling the mixture, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging. The prepared asphalt concrete has excellent freeze-thaw resistance.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to asphalt concrete in severe cold regions.
Background
The concrete material has the characteristics of low price, convenient construction, strong bearing capacity and the like, is widely applied to engineering construction, and is a building material with the largest consumption. Accidents that lead to premature failure of structures due to poor durability of concrete have been common at home and abroad for decades. In cold regions, freeze-thaw cycling damage is the primary form of concrete structure damage. The freeze-thaw damage phenomenon of the concrete structure of China exists in the 'three north' area, the climate is mild, but the freeze-thaw damage phenomenon of the concrete structure still exists in frozen areas of east China, China (such as Shandong, Anhui, Jiangsu, Hubei and the like) and highlands (inner Mongolia plateaus, Qinghai-Tibet plateaus and the like) with higher altitude in winter.
For example, the chinese invention patent, application No.: CN201510245034.1, publication No.: CN104846737A discloses a flexible freeze-thaw resistance treatment method for highway bridge expansion joints in seasonal frozen soil areas, which comprises the following steps: chiseling damaged concrete in an original anchoring area, removing original concrete materials, pouring high-performance abrasion-resistant concrete, flexibly filling materials between the expansion joints of the edge beam and the hairer, setting the initial setting time of the caulking materials for 3-5 hours, setting the initial setting time for 25-30 days, and finishing the treatment. The mode of restoreing to traditional concrete has been given to above-mentioned patent, but repair cost is higher, time cycle is long, is unfavorable for highway traffic's timely recovery, and causes the pothole on highway surface after repairing many times.
Disclosure of Invention
The invention aims to provide asphalt concrete in severe cold areas, wherein a cold-resistant agent is introduced on the basis of the traditional asphalt concrete, wherein the cold-resistant agent comprises four substances of polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, and the four substances are synergistic with each other, so that the freeze-thaw resistance effect of the asphalt concrete in severe cold areas can be effectively improved.
In order to achieve the purpose, the invention provides asphalt concrete for severe cold areas, which comprises the following raw materials in parts by weight:
cement: 60 to 80 portions of the raw materials are mixed,
fly ash: 15 to 30 portions of the raw materials are mixed,
crushing stone: 10 to 20 portions of the raw materials are mixed,
petroleum asphalt: 8 to 12 portions of the raw materials are mixed,
apatite mineral powder: 5 to 10 portions of the raw materials are mixed,
cold-resistant agent: 3 to 10 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 3-7 parts of a stabilizer;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the composite material comprises the following raw materials in parts by weight:
cement: 65 to 72 parts of (a) a polymer,
fly ash: 18 to 25 portions of the raw materials, and the weight portion of the mixture,
crushing stone: 12 to 17 portions of the raw materials are mixed,
petroleum asphalt: 8 to 12 portions of the raw materials are mixed,
apatite mineral powder: 5 to 10 portions of the raw materials are mixed,
cold-resistant agent: 4 to 7 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 3-7 parts of a stabilizer;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the composite material comprises the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
cold-resistant agent: 6 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10-15 ℃, and the ambient air humidity range is 40-60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
The asphalt concrete for the severe cold area provided by the technical scheme has the following beneficial effects:
(1) compared with the prior art, the test shows that the prepared asphalt concrete can be used in severe cold areas, and in the freeze-thaw resistance experiment, the freeze-thaw cycle experiment for 300 times and the freezing fatigue experiment for 10 ten thousand times show that all experimental parameters have significant differences;
(2) cold resistant agent component plays key effect in asphalt concrete, promotes asphalt concrete's freeze-thaw resistance effect, particularly, improves the inner structure of concrete, and promotes the coagulability between pitch and the cement to do benefit to the formation of bubble structure, promote the heat storage capacity of concrete, so that reach freeze-thaw resistance effect.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 60 parts of (a) to (b),
fly ash: 30 parts of (a) to (b),
crushing stone: 10 parts of (a) to (b),
petroleum asphalt: 12 parts of (a) to (b),
apatite mineral powder: 5 parts of (a) a mixture of (b),
cold-resistant agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 3 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 40%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Example 2
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 80 parts of (a) a water-soluble polymer,
fly ash: 15 parts of (a) to (b),
crushing stone: 20 parts of (by weight), and mixing the components,
petroleum asphalt: 8 parts of (a) a mixture of (b),
apatite mineral powder: 10 parts of (a) to (b),
cold-resistant agent: 3 parts of (a) to (b),
polycarboxylic acid water reducing agent: 7 parts;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 15 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Example 3
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 65 parts of (a) a reaction product of (B),
fly ash: 25 parts of (a) to (b),
crushing stone: 12 parts of (a) to (b),
petroleum asphalt: 12 parts of (a) to (b),
apatite mineral powder: 5 parts of (a) a mixture of (b),
cold-resistant agent: 7 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 3 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Example 4
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 72 parts of (a) to (b),
fly ash: 18 parts of (a) to (b),
crushing stone: 17 parts of (a) to (b),
petroleum asphalt: 8 parts of (a) a mixture of (b),
apatite mineral powder: 10 parts of (a) to (b),
cold-resistant agent: 4, preparing 4 parts of the mixture,
polycarboxylic acid water reducing agent: 7 parts;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10-15 ℃, and the ambient air humidity range is 40-60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Example 5
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
cold-resistant agent: 6 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Comparative example 1
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
cold-resistant agent: 6 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 1: 1: 1.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Comparative example 2
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
cold-resistant agent: 6 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol and fluororubber, wherein the mass ratio of the polyethylene glycol to the fluororubber is 1: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Comparative example 3
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
cold-resistant agent: 6 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol and polyacrylonitrile, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile is 1: 3.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Comparative example 4
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
cold-resistant agent: 6 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of a mixture;
the cold-resistant agent comprises polymethyl methacrylate and fluororubber, wherein the mass ratio of the polymethyl methacrylate to the fluororubber is 5: 2.
in the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Comparative example 5
The asphalt concrete for severe cold areas of the embodiment comprises the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of the raw materials.
In the asphalt concrete for severe cold regions described above,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
In the asphalt concrete for severe cold regions described above,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-;
in the asphalt concrete for severe cold regions described above,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
In the asphalt concrete for severe cold regions described above,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
In the asphalt concrete for severe cold regions described above,
in the step (1), the storage temperature of the cement, the fly ash, the macadam, the petroleum asphalt, the apatite mineral powder and the polycarboxylic acid water reducing agent is 10 ℃, and the ambient air humidity range is 60%.
In the asphalt concrete for severe cold regions described above,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
In the asphalt concrete for severe cold regions described above,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
Comparative example 6
Patent granted to China invention, application number: CN201810231395.4, publication No.: CN108358487A discloses an asphalt concrete filler and asphalt concrete, and the technical scheme is as follows:
"an asphalt concrete filler is prepared from the following raw materials in parts by weight: 40 parts of ceramic waste powder, 10 parts of blast furnace slag powder, 7 parts of lime, 15 parts of cement, 0.55 part of sodium dodecyl sulfate and 0.4 part of stearic acid. The specific surface area of the ceramic waste powder is more than or equal to 280m2/kg, the particle size is 20-40 μm, the moisture content is less than or equal to 0.5%, and the ignition loss is less than or equal to 0.02%.
The asphalt concrete is prepared from the following raw materials in parts by weight: 6 parts of asphalt concrete filler, 8 parts of asphalt and 65 parts of coarse aggregate with the particle size of 5-30mm, wherein the coarse aggregate is formed by mixing gravel and river sand according to the mass ratio of 1:1, 25 parts of fine aggregate with the particle size of 0.5-2mm, and the fine aggregate is formed by mixing gravel and river sand according to the mass ratio of 1: 3.
Comparative example 7
Patent granted to China invention, application number: CN201810230105.4, publication No.: CN108358501A discloses a modifier for high-strength asphalt concrete and preparation and application thereof, and the technical scheme is as follows:
"a modifier for high-strength asphalt concrete, which consists of a component A and a component B, wherein the mass ratio of the component A to the component B is 1: 0.17;
the component A comprises the following raw materials in parts by weight: 92.8 percent of aqueous epoxy resin emulsion, 3.7 percent of silane coupling agent modified nano-alumina, 3.3 percent of hollow mesoporous silica microspheres and KH 5600.2 percent of silane coupling agent.
Wherein the water-based epoxy resin emulsion is AB-EP-20 of Anbang, Zhejiang.
The component B comprises the following raw materials in percentage by weight: 80% of tetraethylenepentamine and 20% of deionized water.
The raw material premixing method of the modifier for the high-strength asphalt concrete comprises the following steps:
(1) preparing a component A: weighing the aqueous epoxy resin emulsion, the nano alumina, the hollow mesoporous silica microspheres and the silane coupling agent KH560 according to the formula ratio, transferring the raw materials into a dispersing barrel, ultrasonically dispersing for 50min while stirring, and packaging;
(2) preparing a component B: weighing tetraethylenepentamine and deionized water according to the formula ratio, stirring and mixing uniformly, and packaging;
(3) blending: when the asphalt concrete is modified, the component A and the component B are poured into the blending barrel according to the mass ratio of the component A to the component B, and are used after being uniformly stirred.
Comparative example 8
Patent granted to China invention, application number: cn202010338776.x, publication No.: CN111497014B discloses a preparation process of asphalt concrete, which comprises the following steps:
"a process for preparing asphalt concrete, the concrete process for preparing asphalt concrete is as follows:
s1, injecting mortar sand: mixing mortar to be stirred with sandstone according to a certain proportion and putting the mixture into the material containing module 24;
s2, concrete stirring: the driving motor 21 works to drive the mortar and the sand stones in the material containing module 24 to rotate and match with the stirring unit 4, so that the mortar and the sand stones are fully mixed into concrete;
s3, injecting liquid asphalt: injecting a volume of liquid asphalt into the material holding module 24;
s4, stirring asphalt concrete: the concrete and the asphalt mixture in the material containing module 24 are driven to rotate by the work of the driving motor 21 to be matched with the stirring unit 4, so that the asphalt and the concrete are fully mixed into the asphalt concrete;
s5, heat preservation of asphalt concrete: the asphalt concrete is heated by the material containing module 24 so as to keep the liquid mixture state of the asphalt concrete, and the asphalt concrete is prevented from being coagulated in the material containing module 24;
the preparation of the asphalt concrete in the steps of the asphalt concrete preparation process S1-S5 needs to be completed by matching the lower bracket 1, the driving unit 2, the upper bracket 3 and the stirring unit 4; wherein:
the upper end surface of the lower bracket 1 is provided with a driving unit 2, and the upper end of the driving unit 2 is provided with a stirring unit 4; the stirring unit 4 is positioned inside the driving unit 2; the outer wall of the stirring unit 4 is connected with the outer wall of the upper end face of the lower support 1 through the uniformly arranged upper support 3.
The driving unit 2 comprises a driving motor 21, a driving gear 22, a gear ring 23 and a material accommodating module 24; the output shaft of the driving motor 21 is provided with a driving gear 22 through a flange, the outer wall of the material accommodating module 24 is provided with a gear ring 23, the gear ring 23 is arranged on the lower bracket 1 in a movable connection mode, and the gear ring 23 and the driving gear 22 are mutually meshed; the material containing module 24 is driven to rotate circumferentially by the operation of the driving motor 21, so that the mixture inside is matched with the stirring unit 4 for stirring and mixing.
The material containing module 24 comprises a material containing barrel 241, heat insulation cotton 242, a heating plate 243, an upper fixed barrel 244, a material discharging pipe 245, an execution cylinder 246 and a material baffle 247; the inner wall of the material containing barrel 241 is provided with an annular groove hole, the heat insulation cotton 242 is arranged on the outer side wall of the annular groove hole of the inner wall of the material containing barrel 241, and the inner side wall of the annular groove hole on the inner wall of the material containing barrel 241 is provided with a heating plate 243; the upper fixed cylinder 244 is arranged at the upper end of the material containing cylinder 241 in a threaded connection mode, a through hole is formed in the upper end of the upper fixed cylinder 244, and balls are uniformly arranged on the outer wall of the through hole in a movable connection mode; a material discharge pipe 245 is arranged at the lower end of the material containing barrel 241, a material baffle plate 247 is arranged in the material discharge pipe 245 through a pin shaft, and the lower end of the material baffle plate 247 is connected with the top end of the execution cylinder 246 through a pin shaft; the actuating cylinder 246 is arranged on the inner wall of the discharge pipe 245; the heating plate 243 heats the internal mixture to raise the temperature of the internal mixture, so as to keep the internal asphalt in a molten state, avoid asphalt condensation and ensure the mixing between the asphalt and the concrete; and the heat insulation cotton 242 further improves the heat preservation effect inside the material containing barrel 241.
The stirring unit 4 comprises a conical feeding cylinder 41, a baffle ring 42, a material stopping plate 43, an auxiliary spring 44, a movable sleeve 45, a limiting spring 46, a stirring module 47 and an auxiliary module 48; the side wall of the conical feeding cylinder 41 is provided with a guide hole, the inner wall of the conical feeding cylinder 41 is provided with a baffle ring 42, the inner wall of the conical feeding cylinder 41 at the lower end of the baffle ring 42 is provided with a material stopping plate 43 through a hinge, and the material stopping plate 43 is connected with the inner wall of the conical feeding cylinder 41 through an auxiliary spring 44; the lower end of the conical feeding cylinder 41 is provided with a movable sleeve 45 in a movable connection mode, and the movable sleeve 45 is abutted against the conical feeding cylinder 41 through a limiting spring 46 in the conical feeding cylinder 41; the stirring units 4 are symmetrically arranged on the outer wall of the lower end of the movable sleeve 45, and the lower ends of the two stirring modules 47 are connected through an auxiliary module 48;
the stirring module 47 comprises a rectangular sleeve 471, an auxiliary cylinder 472, a stirring rod 473, a connecting rod 474, a telescopic rod 475 and a push ring 476; stirring rods 473 are uniformly arranged inside the rectangular sleeve 471 through pin shafts, adjacent stirring rods 473 are connected through a connecting rod 474, a push ring 476 is sleeved on the outer wall of each stirring rod 473, and the outer wall of each push ring 476 is connected with the top end of the telescopic rod 475; the telescopic rod 475 is arranged on the stirring rod 473; the auxiliary cylinder 472 is installed on the inner wall of the top end of the rectangular sleeve 471, and the top end of the auxiliary cylinder 472 is matched with the rear end of the stirring rod 473 at the uppermost end in the rectangular sleeve 471; the outer wall of the stirring rod 473 is coated with a non-stick material; the cleanliness of the outer wall of the stirring rod 473 is improved by coating the outer wall of the stirring rod 473 with the non-stick material; the adhesion of asphalt concrete to the outer wall of the stirring rod 473 is fully reduced, and the stirring function of the stirring rod 473 is improved; the stirring rod 473 is vibrated up and down by the reciprocating movement of the auxiliary cylinder 472 by pushing the tip of the stirring rod 473; the mixture inside is agitated up and down by the overall movement of the stirring rods 473 arranged in a row, thereby promoting the mixing degree of the mixture inside; and to ensure the outer wall of the stirring rod 473 is clean; the outer wall of the stirring rod 473 is kept clean by moving the telescopic rod 475 and the push ring 476 on the stirring rod 473; the next stirring effect of the stirring rod 473 on the internal mixture is ensured.
The auxiliary module 48 comprises an auxiliary plate 481, an actuating motor 482, an actuating roller 483 and a fanning plate 484; the auxiliary plate 481 is arranged at the lower end of the rectangular sleeve 471, the executive motor 482 is arranged on the auxiliary plate 481 through a motor base, an output shaft of the executive motor 482 is connected with a shaft head at one end of an executive roller 483 through a coupling, a shaft head at the other end of the executive roller 483 is arranged on the auxiliary plate 481 at the opposite side of the executive motor 482 through a bearing, and a fanning plate 484 is uniformly arranged on the outer wall of the executive roller 483; the executive motor 482 drives the executive roller 483 to rotate circumferentially to stir and mix the mixture inside up and down under the action of the fan plate 484; the mixing degree of the asphalt and the concrete is promoted; sufficient stirring of the internal mixture is achieved.
Example 6
The concrete prepared in the examples 1 to 5 and the concrete prepared in the comparative examples 1 to 8 are selected, and are sent to the Guangdong province building material product quality inspection center for detection by referring to the following literature methods and national standards.
(1) The application technical standard of the asphalt concrete in the JGJ/T12-2019 severe cold area is as follows;
it should be noted that the concrete of examples 1 to 5 and the concrete of comparative examples 1 to 8 in the present application were subjected to the following procedures:
conveying the premixed asphalt concrete raw materials into a stirring tank, adding water, stirring and uniformly mixing, wherein the mass ratio of the premixed asphalt concrete raw materials to the water is 1: 0.4.
it should be noted that the concrete in examples 1 to 5 and comparative examples 1 to 8 of the present application was constructed as follows:
pouring the obtained concrete out of the stirring tank, transferring the concrete into a mould, curing, standing the concrete in the mould for 72 hours at room temperature, then removing the mould, transferring the concrete into a curing room of a construction site, controlling the temperature of the curing room to be 30 ℃ and controlling the humidity of the curing room to be 95%; the curing period was 28 days, with water sprays on the concrete surface at 7d intervals.
And (3) testing the freeze-thaw resistance: the concrete blocks are respectively tested for the freeze-thaw resistance according to ASTM/C Standard test method for Rapid concrete Freeze-thaw ability, and for the freezing fatigue according to FB50010-2010 concrete Structure design Specification.
TABLE 1 test Structure
As shown in Table 1, in the present application, the concrete prepared in examples 1 to 5 is excellent in freezing resistance and superior in each test parameter to the prior art, as compared with comparative examples 1 to 8, and is suitable for use in severe cold regions such as northeast region and Qinghai-Tibet plateau; specifically, 300 times of freeze-thaw cycle experiments of the prepared asphalt concrete show that the loss rate of the compressive strength is only 15.6% -16.8%, the loss rate of the dynamic elastic modulus is only 14.5% -15.2%, the loss rate of the mass is only 1.9% -2.2%, and meanwhile, 10 ten thousand times of freeze fatigue experiments show that the loss rate of the flexural strength is only 8.2% -8.9%. The application sets contrast in comparative examples 1-5, which brings significant difference in effect for comparing important components in the application; specifically, in comparative example 1, the proportional relationship among polyethylene glycol, polyacrylonitrile, polymethyl methacrylate, and fluororubber was adjusted to 1: 1: 1: in the research process, the four substances are found to play a synergistic role, and particularly, the four subsequent comparative examples can be obviously seen, and in addition, tests of other proportional relations are also carried out, for example, the proportional relation of polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber is adjusted to 1: 1: 5: 5. 1: 1: 5: 2. 1: 3: 1: 1. 1: 3: 1: 2 and 3: 5: 2: 1, and the like, but the test effect is poor, the corresponding 300 times of freeze-thaw cycle experiments show that the percentage value of the loss rate of the compressive strength, the loss rate of the dynamic elastic modulus and the average increase of the quality loss rate is about 3.5, 6.2 and 1.4, and the corresponding 10 ten thousand times of freeze fatigue experiments show that the percentage value of the loss rate of the flexural strength average increase is 3.2, so that the change of the proportional relationship among the four substances of the cold-resistant agent can generate obvious adverse effects on the freeze-thaw resistance; in comparative examples 2, 3 and 4, the removal test of two substances of the cold-resistant agent can also find that the data of 300 times of freezing-thawing cycle experiments and 10 ten thousand times of freezing fatigue experiments are greatly increased and are much more serious than the change of the proportional relation in the comparative example 1, which shows that the four substances play a synergistic effect, meanwhile, we also performed comparative experiments to remove only one of the cold-resistant agents, such as only polyethylene glycol, only polyacrylonitrile, only polymethyl methacrylate or only fluororubber, but the test effect becomes worse, and the corresponding 300 times of freeze-thaw cycle experiments show that the percentage value of the average increase of the compressive strength loss rate, the dynamic elastic modulus loss rate and the mass loss rate is about 8.5, 11.7 and 1.9, the corresponding freezing fatigue test of 10 ten thousand times shows that the percentage value of the average increase of the loss rate of the flexural strength is 6.8; in comparative example 5, no cold-resistant agent was added at all, and the freezing-thawing cycle test of 300 times and the freezing fatigue test of 10 ten thousand times showed extremely poor values. In conclusion, the cold-resistant agent, the polyethylene glycol, the polyacrylonitrile, the polymethyl methacrylate and the fluororubber are creatively introduced to realize synergistic interaction, so that the internal structure of the concrete is improved, the coagulability between asphalt and cement is improved, the formation of a bubble structure is facilitated, and the heat storage capacity of the concrete is improved, so that the freeze-thaw resistance effect is achieved.
In addition, in comparative examples 6 to 8, the overall effects are inferior to the data of examples 1 to 5 of the present application, and the reason is presumed as follows: (1) the strength of the concrete can be improved by singly using the blast furnace slag powder, and the anti-freezing effect of the concrete is improved slightly; (2) the silicon dioxide microspheres have high manufacturing cost, and the epoxy resin emulsion has poor performance in a low-temperature environment; (3) the interaction between the asphalt and the cement cannot be realized so as to form a heat storage three-dimensional structure.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The asphalt concrete for the severe cold area is characterized by comprising the following raw materials in parts by weight:
cement: 60 to 80 portions of the raw materials are mixed,
fly ash: 15 to 30 portions of the raw materials are mixed,
crushing stone: 10 to 20 portions of the raw materials are mixed,
petroleum asphalt: 8 to 12 portions of the raw materials are mixed,
apatite mineral powder: 5 to 10 portions of the raw materials are mixed,
cold-resistant agent: 3 to 10 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 3-7 parts of a stabilizer;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
2. the asphalt concrete for severe cold regions according to claim 1, comprising the following raw materials in parts by weight:
cement: 65 to 72 parts of (a) a polymer,
fly ash: 18 to 25 portions of the raw materials, and the weight portion of the mixture,
crushing stone: 12 to 17 portions of the raw materials are mixed,
petroleum asphalt: 8 to 12 portions of the raw materials are mixed,
apatite mineral powder: 5 to 10 portions of the raw materials are mixed,
cold-resistant agent: 4 to 7 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 3-7 parts of a stabilizer;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
3. the asphalt concrete for severe cold regions according to claim 2, comprising the following raw materials in parts by weight:
cement: 70 parts of (a) to (b),
fly ash: 21 parts of (a) to (b),
crushing stone: 15 parts of (a) to (b),
petroleum asphalt: 10 parts of (a) to (b),
apatite mineral powder: 8 parts of (a) a mixture of (b),
cold-resistant agent: 6 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 5 parts of a mixture;
the cold-resistant agent comprises polyethylene glycol, polyacrylonitrile, polymethyl methacrylate and fluororubber, wherein the mass ratio of the polyethylene glycol to the polyacrylonitrile to the polymethyl methacrylate to the fluororubber is 1: 3: 5: 2.
4. the asphalt concrete for severe cold regions according to claim 3,
the cement is P.O 42.5.5R portland cement;
the fly ash is grade III, and the 45 mu m screen residue is not more than 45%;
the particle size of the broken stone is 0.5 mm.
5. The asphalt concrete for severe cold regions according to claim 3,
the indexes of the petroleum asphalt are as follows:
the penetration degree is 65, the extensibility is 167.3 and the softening point is 51.5;
the petroleum asphalt is purchased from Guangzhou Chengshisei chemical technology Co., Ltd, and the product standard is GB/T494-.
6. The asphalt concrete for severe cold regions according to claim 3,
the fineness of the apatite mineral powder is 100 meshes;
the polycarboxylic acid water reducing agent is purchased from Shandong Wanshan chemical industry Co., Ltd, and is FDN-C.
7. The asphalt concrete for severe cold regions according to claim 3,
the method for premixing the raw materials of the asphalt concrete in the severe cold area comprises the following steps:
(1) preparing cement, fly ash, broken stone, petroleum asphalt, apatite mineral powder, a cold-resistant agent and a polycarboxylic acid water reducing agent for later use;
(2) preheating petroleum asphalt and apatite mineral powder, and premixing the preheated petroleum asphalt and apatite mineral powder with cement to obtain a mixing agent for later use;
(3) and cooling the mixture to 80 ℃, adding the fly ash, the broken stone, the cold-resistant agent and the polycarboxylic acid water reducing agent, stirring for the second time, cooling to room temperature, and bagging.
8. The asphalt concrete for severe cold regions according to claim 7,
in the step (1), the storage temperature of the cement, the fly ash, the broken stone, the petroleum asphalt, the apatite mineral powder, the cold-resistant agent and the polycarboxylic acid water reducing agent is 10-15 ℃, and the ambient air humidity range is 40-60%.
9. The asphalt concrete for severe cold regions according to claim 7,
the preheating temperature in the step (2) is 150 ℃;
the rotation speed of the premixing in the step (2) is 200 r/min;
the temperature of the premixing in the step (2) was 120 ℃.
10. The asphalt concrete for severe cold regions according to claim 7,
the temperature of the secondary stirring in the step (3) is 55 ℃;
the rotating speed of the secondary stirring in the step (3) is 600 r/min.
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| CN110117927A (en) * | 2019-06-06 | 2019-08-13 | 广东隆建工程有限公司 | Asphalt concrete pavement construction method |
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| CN101608069A (en) * | 2008-06-19 | 2009-12-23 | 中国石油化工股份有限公司 | A kind of composite modified asphalt and preparation method thereof |
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Application publication date: 20211029 |