CN115140971A - Anti-freezing and thawing pervious concrete and preparation method thereof - Google Patents
Anti-freezing and thawing pervious concrete and preparation method thereof Download PDFInfo
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- CN115140971A CN115140971A CN202210882001.8A CN202210882001A CN115140971A CN 115140971 A CN115140971 A CN 115140971A CN 202210882001 A CN202210882001 A CN 202210882001A CN 115140971 A CN115140971 A CN 115140971A
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/34—Metals, e.g. ferro-silicon
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- 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
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention relates to the field of concrete processing, in particular to freeze-thaw resistant pervious concrete and a preparation method thereof. The method comprises the following steps: the method comprises the following steps: adding water into the broken stone, the sand and the cement, and uniformly mixing to obtain a concrete base material; step two: adding the coarse aggregate and the additive into the concrete base material for fully mixing; step three: and C, punching and cutting the metal square pipe, and then adding the metal square pipe into the concrete mixed in the step II for mixing to obtain the freeze-thaw resistant pervious concrete. The concrete comprises the following components in parts by weight: 200-300 parts of coarse-grained gravel; 120-160 parts of sand; 120-150 parts of cement; 30-40 parts of coarse aggregate; 5-12 parts of an admixture; 200-250 parts of water; 30-40 parts of an antifreeze agent; 30-35 parts of a water reducing agent; 50-55 parts of metal frame and 10-15 parts of metal. There is an advantage in that the strength of concrete can be enhanced by the added metal.
Description
Technical Field
The invention relates to the field of concrete processing, in particular to freeze-thaw resistant pervious concrete and a preparation method thereof.
Background
Pervious concrete is also called porous concrete, sand-free concrete and pervious terrace. The porous light concrete is prepared by mixing aggregate, cement, reinforcing agent and water, does not contain fine aggregate, and the permeable concrete has a cellular structure with uniformly distributed pores formed by coating a thin layer of cement slurry on the surface of coarse aggregate and mutually bonding the thin layer of cement slurry, so the porous light concrete has the characteristics of air permeability, water permeability and light weight. In the prior art, the produced freeze-thaw resistant pervious concrete ignores the strength of the concrete in order to enhance the water permeability of the concrete, so that the concrete is easy to collapse and crack when in use.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the freeze-thaw resistant pervious concrete and the preparation method thereof, which can enhance the strength of the concrete through the added metal.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a preparation method of freeze-thaw resistant pervious concrete comprises the following steps:
the method comprises the following steps: adding water into the broken stone, the sand and the cement, and uniformly mixing to obtain a concrete base material;
step two: adding the coarse aggregate and the additive into the concrete base material for fully mixing;
step three: and C, punching and cutting the metal square pipe, adding the metal square pipe into the concrete mixed in the step two, and mixing to obtain the freeze-thaw resistant pervious concrete.
The freeze-thaw resistant pervious concrete preparation method is realized by using a freeze-thaw resistant pervious concrete preparation device, wherein the device comprises a vertical frame for limiting a square pipe, an auxiliary frame fixedly connected on the vertical frame, a clamping cylinder fixedly connected on the auxiliary frame, a pressing plate fixedly connected on a cylinder rod of the clamping cylinder, a saw plate which is arranged on the side surface of the vertical frame and can slide in a reciprocating manner, a propelling block which is in sliding connection with the saw plate, and a feeding cylinder fixedly connected on the propelling block for movement.
The saw blade feeding mechanism is characterized by further comprising a ring frame for installing a feeding cylinder, wherein the ring frame is fixedly connected with two reciprocating cylinders, cylinder rods of the two reciprocating cylinders are fixedly connected with limiting blocks, and the saw blade slides on the two limiting blocks.
The concrete comprises the following components in parts by weight: 200-300 parts of coarse-grained gravel; 120-160 parts of sand; 120-150 parts of cement; 30-40 parts of coarse aggregate; 5-12 parts of admixture; 200-250 parts of water; 30-40 parts of an antifreeze agent; 30-35 parts of a water reducing agent; 50-55 parts of metal frame and 10-15 parts of metal.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a flow chart of the concrete preparation process;
FIG. 2 is a view showing a structure of a cross-clamped square tube;
FIG. 3 is a schematic view of a truncated square tube;
FIG. 4 is a view showing the construction of a clamping square tube;
FIG. 5 is a view showing a structure of a cut square pipe;
FIG. 6 is a view showing the structure of the drill bit;
FIG. 7 shows the square tube being cut by the drill bit;
FIG. 8 is a diagram illustrating the relationship of the drop position of the square tube;
FIG. 9 is a view showing the structure of the driving ring;
fig. 10 is a structural view of mixing concrete.
A ring frame 11; a ring gear 12; a stirring frame 13; an adjusting bracket 21; a screw rod 22; a carriage 31; a stand 32; a central axis 33; a screw bushing 34; an auxiliary frame 41; a pressure plate 42; a clamp cylinder 43; a reciprocating cylinder 51; a stopper 52; a saw plate 61; a feed cylinder 62; a pusher block 63; a connecting frame 71; a push cylinder 72; a drill bit 73; a rotary wheel 74; a driving frame 81; a speed reduction motor I82; a drive wheel 83; a base frame 91; the planet gears 92.
Detailed Description
Referring to fig. 1, a detailed flow of a method for preparing the freeze-thaw resistant pervious concrete is illustrated:
a preparation method of freeze-thaw resistant pervious concrete comprises the following steps:
the method comprises the following steps: adding water into the broken stones, the sand and the cement, uniformly mixing to obtain a concrete base material, selecting coarse-grained broken stones as the broken stones with high water permeability, and mixing the broken stones, the sand and the cement with the water to obtain the pervious concrete;
step two: the coarse aggregate and the additive are added into the concrete base material for full mixing, so that the water permeability and the frost resistance of the pervious concrete can be improved;
step three: and C, punching and cutting the metal square pipe, adding the metal square pipe into the concrete mixed in the step II, and mixing to obtain the freeze-thaw resistant pervious concrete, wherein the pervious concrete has low bearing capacity due to the fact that the coarse aggregate, the coarse-grained gravel and the like reduce the strength of the concrete, and the metal square pipe can enhance the strength of the mixed concrete.
With the above embodiments, the following functions can also be realized;
referring to fig. 2, 3 and 4, the process of implementing the cut square tube is described in detail:
the device comprises a vertical frame 32 for limiting a square pipe, the square pipe can be placed in the vertical frame 32, an auxiliary frame 41 is fixedly connected onto the vertical frame 32, a clamping cylinder 43 is fixedly connected onto the auxiliary frame 41 through a bolt, a pressing plate 42 is fixedly connected onto a cylinder rod of the clamping cylinder 43 through a bolt, a fault is arranged in the middle of the vertical frame 32, when the clamping cylinder 43 is started, the cylinder rod of the clamping cylinder 43 pushes the pressing plate 42 to stretch out, the pressing plate 42 stretches out to the middle position of the vertical frame 32 and presses on the square pipe to fix the square pipe, when the pressing plate 42 contracts, automatic blanking of the pressing plate 42 is achieved, a saw plate 61 is arranged on the side face of the vertical frame 32, the saw plate 61 can slide in a reciprocating mode, the square pipe can be cut, the saw plate 61 is connected onto a pushing block 63 in a sliding mode, the pushing block 63 is fixedly connected onto the cylinder rod of the feeding cylinder 62, the feeding cylinder 62 is started, the feeding cylinder 62 drives the feeding cylinder block 63 to slide, the pushing block 63 drives the saw plate 61 to achieve feeding of the square pipe, cutting of the square pipe, automatic feeding of concrete is achieved, and the square pipe is added into the concrete to be mixed, and the concrete is processed.
With the above embodiments, the following functions can also be realized;
referring to fig. 2 and 3, the implementation process of driving the saw plate to slide back and forth and cutting the square tube is described in detail:
With the above embodiments, the following functions can also be realized;
referring to fig. 2, 4 and 8, the implementation of the concrete processing process by dropping the cut square pipe at the lower end by driving the sliding carriage to slide will be described in detail:
through bolt fixedly connected with alignment jig 21 on the ring frame 11, swivelling joint has lead screw 22 on the alignment jig 21, lead screw 22 passes through bolt fixed connection on the output shaft of gear motor II, gear motor II passes through bolt fixed connection on alignment jig 21, sliding connection has balladeur train 31 on the alignment jig 21, fixedly connected with lead screw cover 34 on the balladeur train 31, lead screw 22 passes through screw drive with lead screw cover 34, grudging post 32 fixed connection is on balladeur train 31, start gear motor II, gear motor II drives lead screw 22 and rotates, lead screw 22 passes through screw drive lead screw cover 34, lead screw cover 34 drives balladeur train 31 and slides on alignment jig 21, balladeur train 31 can drive grudging post 32 and carry out the regulation of position, thereby realize the regulation of the position of square pipe, and then realize the regulation of the position that square pipe dropped.
With the above embodiments, the following functions can also be realized;
referring to fig. 3 and 5, the process of processing the square pipe to increase its water permeability is described in detail:
the carriage 31 is connected on the cylinder rod of the pushing cylinder 72 through bolt fixing, the cylinder body of the pushing cylinder 72 is connected on the connecting frame 71 through bolt fixing, the drill bit 73 is connected on the connecting frame 71 through a bearing in a rotating mode, the drill bit 73 can rotate around the axis of the drill bit, the pushing cylinder 72 is started, the cylinder rod of the pushing cylinder 72 contracts, the cylinder body of the pushing cylinder 72 drives the connecting frame 71 to slide, the connecting frame 71 drives the drill bit 73 to slide, the drill bit 73 realizes the sliding of the axis direction under the rotating condition, the hole punching of the other side pipe is realized, the drill bit 73 and the pressing plate 42 are correspondingly arranged, the feeding of the drill bit 73 can realize the cutting of two symmetrical surfaces of the other side pipe.
With the above embodiments, the following functions can also be realized;
referring to fig. 6, the detailed description is provided for the implementation process of cutting the sundries and blanking of the square tube when the drill bit is reset:
the sliding frame 31 is fixedly connected with a middle shaft 33 through a bolt, the connecting frame 71 is connected to the middle shaft 33 in a sliding mode, when the connecting frame 71 slides, the middle shaft 33 can support the connecting frame 71, when the connecting frame 71 resets, the drill bit 73 is driven to reset, the sundries of the square pipe cut by the drill bit 73 are pushed out of the middle shaft 33 when the sundries reset, blanking of the sundries is achieved, preparation of concrete is participated, the square pipe and metal are added into the concrete, and strength of the concrete is enhanced.
With the above embodiments, the following functions can also be realized;
referring to fig. 7, the implementation process of driving the drill bit to rotate to complete the cutting of the square tube is described in detail:
go up through bolt fixedly connected with runner 74 on the drill bit 73, fixedly connected with drive frame 81 on even frame 71, fixedly connected with gear motor I82 on the drive frame 81, fixedly connected with drive wheel 83 on the output shaft of gear motor I82, runner 74 and drive wheel 83 mesh transmission, start gear motor I82, gear motor I82 drives the drive wheel 83 and rotates, drive wheel 83 meshes drive runner 74 and rotates, runner 74 drives drill bit 73 and rotates, cooperation drill bit 73 feeds on the axis, the completion is to the cutting of square pipe.
With the above embodiments, the following functions can also be realized;
referring to fig. 9, the cut square pipes are dropped into the lower mixed concrete from different positions, and the concrete preparation process is performed:
through bolt fixedly connected with ring gear 12 on the ring frame 11, ring frame 11 rotates through the bearing and connects on chassis 91, rotate through the bearing on chassis 91 and be connected with a plurality of planet wheels 92, a plurality of planet wheels 92 all pass through bolt fixed connection on gear motor III's output shaft, a plurality of gear motor III all pass through bolt fixed connection on chassis 91, a plurality of planet wheels 92 all mesh with ring gear 12 and transmit, start a plurality of gear motor III, a plurality of gear motor III drive a plurality of planet wheels 92 in step and rotate, a plurality of planet wheels 92 mesh drive ring gear 12 rotates in step, ring gear 12 drives ring frame 11 and rotates, cooperation balladeur train 31 is the slip on alignment jig 21, thereby realize the regulation of the square pipe position of whereabouts of cutting, thereby realize that the square pipe in stage falls from different positions, the lower extreme fixedly connected with bucket of mixed concrete of chassis 91, through add halation in the bucket of lower extreme, accomplish the production of concrete.
With the above embodiments, the following functions can also be realized;
referring to fig. 10, the concrete raw material mixing process is illustrated in detail:
through bolt fixedly connected with stirring frame 13 on the 11 inner walls of ring frame, drive stirring frame 13 when ring frame 11 rotates and rotate, can accomplish the mixed processing to concrete raw materials.
With the above embodiments, the following functions can also be realized;
the composition of the freeze-thaw resistant pervious concrete is explained in detail:
the concrete comprises the following components in parts by weight: 200-300 parts of coarse crushed stone; 120-160 parts of sand; 120-150 parts of cement; 30-40 parts of coarse aggregate; 5-12 parts of admixture; 200-250 parts of water; 30-40 parts of an antifreeze agent; 30-35 parts of a water reducing agent; 50-55 parts of metal frame and 10-15 parts of metal, the coarse aggregate and the coarse-grained gravel can increase the water permeability of the concrete, the addition of the antifreeze can enhance the low-temperature resistance of the concrete, and the strength of the prepared concrete is poor, so that the metal frame and the metal which can increase the strength are added, the strength of the concrete is enhanced, and the concrete has better strength under the conditions of low-temperature resistance and high water permeability.
Claims (10)
1. The preparation method of the freeze-thaw resistant pervious concrete is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: adding water into the broken stone, the sand and the cement, and uniformly mixing to obtain a concrete base material;
step two: adding coarse aggregate and additive into the concrete base material for fully mixing;
step three: and C, punching and cutting the metal square pipe, and then adding the metal square pipe into the concrete mixed in the step II for mixing to obtain the freeze-thaw resistant pervious concrete.
2. The preparation method of the freeze-thaw resistant pervious concrete according to claim 1, characterized in that: the concrete freezing and thawing resistant permeable preparation device is realized by using a freezing and thawing resistant permeable concrete preparation device, which comprises a vertical frame (32) for limiting a square pipe, an auxiliary frame (41) fixedly connected on the vertical frame (32), a clamping cylinder (43) fixedly connected on the auxiliary frame (41), a pressing plate (42) fixedly connected on a cylinder rod of the clamping cylinder (43), a saw plate (61) which is arranged on the side surface of the vertical frame (32) and can slide in a reciprocating manner, a propelling block (63) which is in sliding connection with the saw plate (61), and a feeding cylinder (62) fixedly connected on the propelling block (63) for moving.
3. The preparation method of the freeze-thaw resistant pervious concrete according to claim 2, characterized in that: the saw blade feeding mechanism is characterized by further comprising a ring frame (11) provided with a feeding cylinder (62), wherein two reciprocating cylinders (51) are fixedly connected to the ring frame (11), limiting blocks (52) are fixedly connected to cylinder rods of the two reciprocating cylinders (51), and the saw blade (61) slides on the two limiting blocks (52).
4. The preparation method of the freeze-thaw resistant pervious concrete according to claim 3, characterized in that: the device is characterized by further comprising an adjusting frame (21) fixedly connected to the ring frame (11), a screw rod (22) is arranged on the adjusting frame (21) in a rotating mode, a sliding frame (31) is arranged on the adjusting frame (21) in a sliding mode, a screw rod sleeve (34) which is in transmission with the screw rod (22) is fixedly connected to the sliding frame (31) through the sliding frame (31), and a vertical frame (32) is fixedly connected to the sliding frame (31).
5. The preparation method of the freeze-thaw resistant pervious concrete according to claim 4, characterized in that: the drilling machine also comprises a cylinder rod of a pushing cylinder (72) fixedly connected on the sliding frame (31), a connecting frame (71) is fixedly connected on a cylinder body of the pushing cylinder (72), and a drill bit (73) is rotatably arranged on the connecting frame (71).
6. The preparation method of the freeze-thaw resistant pervious concrete according to claim 5, characterized in that: also comprises a middle shaft (33) which is fixedly connected on the sliding frame (31) and is connected with the connecting frame (71) in a sliding way.
7. The preparation method of the freeze-thaw resistant pervious concrete according to claim 6, characterized in that: the drilling machine is characterized by further comprising a rotating wheel (74) fixedly connected to the drill bit (73), a driving frame (81) is fixedly connected to the connecting frame (71), a speed reducing motor I (82) is fixedly connected to the driving frame (81), and a driving wheel (83) for driving the rotating wheel (74) to rotate is fixedly connected to an output shaft of the speed reducing motor I (82).
8. The preparation method of the freeze-thaw resistant pervious concrete according to claim 7, characterized in that: the planetary gear transmission mechanism further comprises a gear ring (12) fixedly connected to the ring frame (11) and a base frame (91) supporting the ring frame (11) to rotate, and a plurality of planetary gears (92) driving the gear ring (12) to rotate are arranged on the base frame (91) in a rotating mode.
9. The preparation method of the freeze-thaw resistant pervious concrete according to claim 8, characterized by comprising the following steps: also comprises a stirring frame (13) fixedly connected on the inner wall of the ring frame (11) for mixing the raw materials.
10. The concrete prepared by the preparation method of the freeze-thaw resistant pervious concrete according to claim 1, characterized in that: the concrete comprises the following components in parts by weight: 200-300 parts of coarse-grained gravel; 120-160 parts of sand; 120-150 parts of cement; 30-40 parts of coarse aggregate; 5-12 parts of an admixture; 200-250 parts of water; 30-40 parts of an antifreeze agent; 30-35 parts of a water reducing agent; 50-55 parts of a metal frame and 10-15 parts of metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210882001.8A CN115140971A (en) | 2022-07-26 | 2022-07-26 | Anti-freezing and thawing pervious concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210882001.8A CN115140971A (en) | 2022-07-26 | 2022-07-26 | Anti-freezing and thawing pervious concrete and preparation method thereof |
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| CN115140971A true CN115140971A (en) | 2022-10-04 |
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| CN202210882001.8A Pending CN115140971A (en) | 2022-07-26 | 2022-07-26 | Anti-freezing and thawing pervious concrete and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6293065B1 (en) * | 1998-02-16 | 2001-09-25 | Sumitomo Osaka Cement Co., Ltd. | High strength porous concrete structure and method of manufacturing the high strength porous concrete structure |
| CN112266217A (en) * | 2020-11-06 | 2021-01-26 | 北京众和聚源混凝土有限公司 | Pervious concrete and preparation method thereof |
| CN113213850A (en) * | 2021-05-26 | 2021-08-06 | 罗成向 | Pervious concrete with strong freeze-thaw resistance and production process thereof |
| CN113292295A (en) * | 2021-06-17 | 2021-08-24 | 武汉纺织大学 | Freeze-thaw resistant pervious concrete and preparation method thereof |
| CN114477863A (en) * | 2020-11-11 | 2022-05-13 | 郴州东升沥青搅拌有限公司 | Asphalt concrete |
-
2022
- 2022-07-26 CN CN202210882001.8A patent/CN115140971A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6293065B1 (en) * | 1998-02-16 | 2001-09-25 | Sumitomo Osaka Cement Co., Ltd. | High strength porous concrete structure and method of manufacturing the high strength porous concrete structure |
| CN112266217A (en) * | 2020-11-06 | 2021-01-26 | 北京众和聚源混凝土有限公司 | Pervious concrete and preparation method thereof |
| CN114477863A (en) * | 2020-11-11 | 2022-05-13 | 郴州东升沥青搅拌有限公司 | Asphalt concrete |
| CN113213850A (en) * | 2021-05-26 | 2021-08-06 | 罗成向 | Pervious concrete with strong freeze-thaw resistance and production process thereof |
| CN113292295A (en) * | 2021-06-17 | 2021-08-24 | 武汉纺织大学 | Freeze-thaw resistant pervious concrete and preparation method thereof |
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