CN112047668A - C40 inorganic coating anti-freezing concrete and preparation method thereof - Google Patents
C40 inorganic coating anti-freezing concrete and preparation method thereof Download PDFInfo
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- CN112047668A CN112047668A CN202010702557.5A CN202010702557A CN112047668A CN 112047668 A CN112047668 A CN 112047668A CN 202010702557 A CN202010702557 A CN 202010702557A CN 112047668 A CN112047668 A CN 112047668A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000007710 freezing Methods 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000004576 sand Substances 0.000 claims abstract description 28
- 239000004575 stone Substances 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 230000002528 anti-freeze Effects 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 13
- 238000004078 waterproofing Methods 0.000 claims abstract description 12
- 238000000265 homogenisation Methods 0.000 claims abstract description 9
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000002253 acid Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 230000008014 freezing Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 24
- 238000012360 testing method Methods 0.000 description 13
- 239000002002 slurry Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 238000012424 Freeze-thaw process Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses C40 inorganic coating antifreeze concrete and a preparation method thereof. The composition comprises the following components in parts by weight: cement 350-; 40-50 parts of fly ash; 750 portions of sand and 800 portions of sand; 1000 portions of stone 950-; 4-5 parts of an additive; 150 portions of water and 200 portions, the preparation method comprises the following steps: pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min; placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min; after mixing, adding cement, fly ash, water reducing agent and water, stirring for 5min, and then adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent, and stirring for 2 min. The invention has simple formula and good freezing resistance and durability, and is suitable for various engineering projects in alpine regions.
Description
Technical Field
The invention relates to C40 inorganic coating anti-freezing concrete and a preparation method thereof, belonging to the technical field of concrete.
Background
Most areas in China belong to severe cold regions, and the requirement on the frost resistance of buildings is high. Under the conditions of severe cold and extreme temperature difference, the internal and external contraction of the conventional concrete is inconsistent, so that the internal stress of the concrete is increased, and cracks are generated.
In order to improve the frost resistance of concrete, an inorganic coating is usually added to the concrete, and the bonding property and the waterproof property of the concrete are enhanced depending on the performance of the inorganic coating. However, in the later stage of concrete curing, fine cracks still can be generated inside concrete due to large temperature difference between the inside and the outside in severe cold areas, and the internal cracks gradually increase along with continuous freezing and melting, so that the strength of the whole concrete construction building is influenced.
Disclosure of Invention
In view of the above, the invention provides the C40 inorganic coating antifreeze concrete and the preparation method thereof, the formula is simple, the antifreeze durability is good, and the concrete is suitable for various engineering projects in alpine regions.
The invention solves the technical problems by the following technical means:
the invention relates to C40 inorganic coating antifreeze concrete which comprises the following components in parts by weight:
cement 350-;
40-50 parts of fly ash;
750 portions of sand and 800 portions of sand;
1000 portions of stone 950-;
4-5 parts of an additive;
150 portions of water and 200 portions of water.
The additive consists of an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1: 1.
The stones are continuously graded with the grain diameter of 5-25 mm.
The fly ash is F class I fly ash.
A preparation method of C40 inorganic coating antifreeze concrete comprises the following steps:
1) pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min;
2) placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min;
3) after mixing, adding cement, fly ash, water reducing agent and water, stirring for 5min, then adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent, and stirring for 2min, wherein the stirring speed in the process is 3-6 r/min.
The invention adds the additive to improve the waterproof and bonding properties of the concrete, thereby improving the frost resistance and durability of the concrete.
The sand and the stones are used as basic lapping frameworks of the concrete, the quantity of the stones is larger, and the sand is filled in gaps among the stones and forms the basic lapping frameworks of the concrete together with the stones. After the cement and the fly ash are dissolved in water, viscous slurry is formed, and the slurry is wrapped outside the lapping frameworks to enhance the bonding effect between the lapping frameworks, so that the strength of the concrete basic framework is improved. The XT-HPA is added into concrete to raise the adhesion and prevent concrete shrinkage crack.
In addition, the admixture comprises XT-HPA penetration type and polycarboxylic acid water reducing agent. The XT-HPA penetration type can improve the bonding property between the concrete lap joint framework and the slurry, and the polycarboxylic acid water reducing agent added into the concrete can further reduce the water consumption and increase the bonding strength between the lap joint frameworks.
The continuous graded stones with the size of 5-25mm are used as basic lapping frameworks, the sizes of the stones are different, the stones with smaller particles are filled among the stones with larger particle sizes, and the concrete frameworks with different lapping layers are integrally formed. The natural medium sand in the area II has smaller grain diameter and is filled in gaps among stones, so that the strength of the lapped framework is further enhanced. The F class I fly ash has low hydration heat and contains a large amount of active silica and alumina, so that the cement is more fully hydrated. In addition, the active silica and the alumina have smaller particle sizes and are filled among cement particles, so that the compactness of concrete can be improved.
According to the formula disclosed by the invention, the concrete prepared by using the proportion has good compressive property, and the strength loss is small after multiple freeze-thaw cycles.
By adopting the technical scheme, after the sand and the stones are pre-homogenized, the surfaces of the sand and the stones are mutually rubbed to form a new tangent plane, so that the sand and the stones are easily mixed with the slurry, and the adhesion is strong.
When the concrete is prepared, sand and stones for constructing the concrete framework are uniformly stirred in advance, and then the sand and the stones are mixed with cement, fly ash and a water reducing agent to form a uniformly dispersed concrete system. And then, an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent is added and stirred, and the slurry, the sand and the stones are bonded by an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent solution, so that the coating is tighter.
The invention has the beneficial effects that:
1. the continuous graded stones and sands are mutually filled and overlapped to form a stable concrete framework, so that the compressive strength of the concrete is increased.
2. The XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent is added into the concrete, so that the bonding effect between the basic lap joint framework of the concrete and the gel substance is improved.
3. The water reducing agent is a polycarboxylic acid water reducing agent, so that the bonding strength of the lap joint framework and the gel substance in the concrete is further improved.
Drawings
FIG. 1 is a flow chart of the process for the preparation of the inventive frost-resistant concrete.
Detailed Description
The invention will be described in detail below with reference to the accompanying figure 1 and specific examples: the antifreeze concrete with the C40 inorganic coating comprises the following components in parts by weight:
cement 350-;
40-50 parts of fly ash;
750 portions of sand and 800 portions of sand;
1000 portions of stone 950-;
4-5 parts of an additive;
150 portions of water and 200 portions of water.
The additive consists of an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1: 1.
The stones are continuously graded with the grain diameter of 5-25 mm.
The fly ash is F class I fly ash.
A preparation method of C40 inorganic coating antifreeze concrete comprises the following steps:
1) pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min;
2) placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min;
3) after mixing, adding cement, fly ash, water reducing agent and water, stirring for 5min, then adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent, and stirring for 2min, wherein the stirring speed in the process is 3-6 r/min.
Example 1
The raw materials according to the present invention are all commercially available, and specific specifications are shown in table 1.
TABLE 1 specification and manufacturer of raw materials used in the examples
A C40 inorganic coating antifreeze concrete and a preparation method thereof, comprising the following steps:
the method comprises the following steps: 785kg of sand and 999kg of pebbles are introduced into respective raw material bins for pre-homogenization;
step two: 785kg of sand and 999kg of stones are put in a forced stirrer to be stirred for 2 min;
step three: 396kg of cement, 44kg of fly ash and 2.2kg of water reducing agent are added into a forced stirrer to be stirred for 5min, and then 2.2kgXT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent is added to be stirred for 2 min.
Wherein the admixture comprises the following components in percentage by weight of 1:1 XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and polycarboxylic acid water reducing agent.
The freeze-thaw cycle test of the inorganic coating anti-freezing concrete prepared by the mixture ratio is carried out according to the fast freeze-thaw test regulation in the test method for the long-term durability and the durability of common concrete (GBJ82-85), and the dynamic elastic modulus and the quality of the test are tested; the compressive strength is in accordance with GB/T50081-2002 Standard of mechanical Properties test methods of ordinary concrete.
The frost resistance of the inorganic coating concrete is tested as follows: placing the concrete test block and the test piece which are maintained in the water saturation state for 28 days into a rubber barrel, placing the rubber barrel into a rapid freeze-thaw circulating machine for freeze-thaw circulating test, wherein the water surface is 2cm higher than that of the concrete test block and the test block, the concrete test block and the test block are in the water saturation state in the freeze-thaw process, and the compression strength, the dynamic elastic modulus and the quality are tested every 50 times of freeze-thaw circulation. The freezing resistance coefficient, the relative dynamic elastic modulus and the mass loss are respectively obtained for 300 times, and the three types of test data are specifically shown in table 2.
Table 2 shows three types of test data of the inorganic coating anti-freeze concrete
From the above data, the initial compressive strength, the dynamic elastic modulus and the mass of the concrete prepared by the above formulation are 66.02MPa, 45.16GPa and 9.5854kg respectively, and the concrete can bear enough strength. After 300 times of circulating freeze thawing, the freeze resistance coefficient, the relative dynamic elastic modulus and the mass loss rate are 87.88%, 98.98% and 0.47% respectively, wherein the relative dynamic elastic modulus is far higher than 60%, and the mass loss rate is far lower than 5%, so that the national standard of testing method for long-term durability and durability of common concrete (GBJ82-85) is met, meanwhile, due to the fact that the inorganic coating is doped, the mass loss rate of the concrete is extremely low, the compressive strength is far higher than the standard of C40 concrete, no crack is generated on the surface of the concrete after 300 times of the freeze thawing cycle, the strength is reduced slightly, and the concrete has good freeze resistance.
The admixture uses an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1:1, so that the using amount of water in concrete is reduced, and the viscosity of the slurry is increased. The bonding between the lapping skeleton formed by the sand and the stones and the slurry is firmer under the action of an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent, so that the frost resistance of the concrete is improved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. The C40 inorganic coating antifreeze concrete is characterized by comprising the following components in parts by weight:
cement 350-;
40-50 parts of fly ash;
750 portions of sand and 800 portions of sand;
1000 portions of stone 950-;
4-5 parts of an additive;
150 portions of water and 200 portions of water.
2. The antifreeze concrete with the C40 inorganic coating, according to claim 1, wherein: the additive consists of an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1: 1.
3. The antifreeze concrete with the C40 inorganic coating, according to claim 1, wherein: the stones are continuously graded with the grain diameter of 5-25 mm.
4. The antifreeze concrete with the C40 inorganic coating, according to claim 1, wherein: the fly ash is F class I fly ash.
5. A preparation method of C40 inorganic coating antifreeze concrete is characterized by comprising the following steps:
1) pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min;
2) placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min;
3) after mixing, adding cement, fly ash, water reducing agent and water, stirring for 5min, then adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent, and stirring for 2min, wherein the stirring speed in the process is 3-6 r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010702557.5A CN112047668A (en) | 2020-07-21 | 2020-07-21 | C40 inorganic coating anti-freezing concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010702557.5A CN112047668A (en) | 2020-07-21 | 2020-07-21 | C40 inorganic coating anti-freezing concrete and preparation method thereof |
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| Publication Number | Publication Date |
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| CN112047668A true CN112047668A (en) | 2020-12-08 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2568446C1 (en) * | 2014-12-29 | 2015-11-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный строительный университет" (ФГБОУ ВПО "МГСУ") | Liquid-glass composition |
| CN108623246A (en) * | 2017-03-24 | 2018-10-09 | 北京市小红门混凝土有限责任公司 | Frost-resistant concrete and preparation method thereof |
-
2020
- 2020-07-21 CN CN202010702557.5A patent/CN112047668A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2568446C1 (en) * | 2014-12-29 | 2015-11-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный строительный университет" (ФГБОУ ВПО "МГСУ") | Liquid-glass composition |
| CN108623246A (en) * | 2017-03-24 | 2018-10-09 | 北京市小红门混凝土有限责任公司 | Frost-resistant concrete and preparation method thereof |
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