CN112321179A - Weather-resistant low-heat cement and preparation method thereof - Google Patents
Weather-resistant low-heat cement and preparation method thereof Download PDFInfo
- Publication number
- CN112321179A CN112321179A CN202011370838.1A CN202011370838A CN112321179A CN 112321179 A CN112321179 A CN 112321179A CN 202011370838 A CN202011370838 A CN 202011370838A CN 112321179 A CN112321179 A CN 112321179A
- Authority
- CN
- China
- Prior art keywords
- parts
- heat
- low
- agent
- weather
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
- C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
Abstract
A weather-resistant low-heat cement and a preparation method thereof. The invention relates to the technical field of building materials, in particular to weather-resistant low-heat cement and a preparation method thereof. Provides the high weather-resistant low-heat cement with strong freeze-thaw cycle resistance and the preparation method thereof. According to the weather-resistant low-heat cement, due to the intervention of the shell-core-shaped (the shell is made of polyester resin, and the core is made of foam glass and ceramic fiber) heat-insulating agent, a microscopic gradient heat-insulating structure is formed in the low-heat cement, the structural impact of the external environment on the low-heat cement under severe temperature change is reduced, and the deformation degree of the low-heat cement under expansion with heat and contraction with cold is reduced. The heat insulating agent and the antifreezing agent are used in a matching manner, so that the low-heat cement is prevented from cracking in repeated freeze-thaw cycles, and a stable mechanical structure and strength are maintained, thereby ensuring the engineering strength and reliability of a concrete structure applying the low-heat cement.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to weather-resistant low-heat cement and a preparation method thereof.
Background
The low-heat portland cement, called low-heat cement for short, is a hydraulic cementing material with low heat of hydration, which is prepared by grinding portland cement clinker and gypsum which are proper components as main components. The low-heat cement has the performance advantages of small shrinkage, high strength and the like, can obviously improve the crack resistance of concrete, and is particularly suitable for large-volume concrete members such as beam piers in mountain-shaped landform road and bridge engineering and structural engineering with extremely high crack resistance requirements such as tunnels and culverts.
In northwest engineering construction of Sichuan and Tibet railways and the like, because the northwest has the characteristics of geological environment such as large temperature difference, dry strong wind, frequent freeze thawing, complex geological medium and the like, a concrete structure is easy to crack and damage, and the reason is that: firstly, the water in the low-temperature cement air holes freezes to cause the volume expansion, and secondly, the aggregate and admixture in the concrete are different from the deformation degree of the low-temperature cement under the expansion with heat and the contraction with cold, so that the internal structure of the concrete is damaged under frequent freeze thawing, and the strength and the durability of the concrete are reduced.
Therefore, how to improve the low-heat cement and solve the defects of concrete cracking and poor weather resistance in application of the low-heat cement caused by insufficient freeze-thaw cycle resistance in the prior art becomes a technical problem to be solved urgently.
Disclosure of Invention
Aiming at the problems, the invention provides high-weather-resistance low-heat cement with strong freeze-thaw cycle resistance and a preparation method thereof.
The technical scheme of the invention is as follows:
the weather-resistant low-heat cement comprises the following components in parts by mass:
low-heat cement clinker aggregate: 70-90 parts of gypsum: 7-9 parts of a heat preservation agent: 5-10 parts of an antifreezing agent: 2-4 parts of auxiliary components: 12 to 15.5 portions.
Further, the heat preservation agent comprises the following components in parts by mass:
0.9-1.03 parts of foam glass, 9-12 parts of polyester resin and 2-3 parts of ceramic fiber.
Further, the low-heat cement clinker comprises the following components in percentage by mass:
C2S：30~40%，
C3S：40~50%，
C3A：0.5~3%，
C4AF：14~18%。
further, the antifreezing agent is a compound of one or more of saltpeter, N-dimethylacetamide, stearic acid amide, sodium tripolyphosphate and sodium xylene sulfate.
Further, the auxiliary components comprise active mixed materials, an early strength agent, a water reducing agent, a grinding aid and an air entraining agent.
Further, the auxiliary components are used in the following amounts by mass:
active mixed material: 5 to 10 parts by weight of a surfactant,
early strength agent: 1 to 2 parts of (A) a water-soluble polymer,
water reducing agent: 1 to 2.5 parts by weight of a stabilizer,
grinding aid: 1.5 to 3.5 parts by weight,
air entraining agent: 1-2 parts.
A preparation method of weather-resistant low-heat cement comprises the following steps:
s1: preparing a heat preservation agent:
s1.1: weighing 0.9-1.03 parts of foam glass, 9-12 parts of polyester resin and 2-3 parts of ceramic fiber by mass;
s1.2: grinding foam glass and ceramic fiber and uniformly mixing;
s1.3: melting polyester resin, adding the polyester resin into the mixture obtained in the step S1.2, and uniformly stirring;
s1.4: cooling and continuously vibrating the substance obtained in the step S1.3, solidifying and grinding to obtain a shell-core-shaped heat preservation agent;
s2: preparing low-heat cement:
s2.1: weighing the following components in parts by mass: 70-90 parts of low-heat cement clinker, 7-9 parts of gypsum, 5-10 parts of a heat insulating agent obtained in S1, 2-4 parts of an antifreezing agent and 12-15.5 parts of an auxiliary component;
s2.2: and respectively grinding or jointly grinding the components, and uniformly mixing to obtain the weather-resistant low-heat cement.
According to the weather-resistant low-heat cement, due to the intervention of the shell-core-shaped (the shell is made of polyester resin, and the core is made of foam glass and ceramic fiber) heat-insulating agent, a microscopic gradient heat-insulating structure is formed in the low-heat cement, the structural impact of the external environment on the low-heat cement under severe temperature change is reduced, and the deformation degree of the low-heat cement under expansion with heat and contraction with cold is reduced.
On the other hand, the antifreezing agent disclosed by the invention can reduce the freezing point of water in cement pores, improve the surface activity of cement, form a hydrophobic membrane and improve the cold resistance of cement, so that the internal pressure stress of a concrete structure caused by freezing volume expansion is reduced, and the internal structure of concrete is prevented from being damaged.
The heat insulating agent and the antifreezing agent are used in a matching manner, so that the low-heat cement is prevented from cracking in repeated freeze-thaw cycles, and a stable mechanical structure and strength are maintained, thereby ensuring the engineering strength and reliability of a concrete structure applying the low-heat cement.
Detailed Description
The present invention will be further described with reference to specific embodiments.
The weather-resistant low-heat cement provided by the invention comprises the following components in parts by mass:
low-heat cement clinker aggregate: 70-90 parts of gypsum: 7-9 parts of a heat preservation agent: 5-10 parts of an antifreezing agent: 2-4 parts of auxiliary components: 12 to 15.5 portions. The heat insulating agent is used for improving the heat insulating property of the low-heat cement and reducing the deformation degree of the cement under the conditions of expansion with heat and contraction with cold; the antifreezing agent is used for lowering the freezing point of water in low-heat cement, improving the surface activity of the cement to form a hydrophobic film and improving the cold resistance of the cement.
The heat preservation agent comprises the following components in parts by mass:
0.9-1.03 parts of foam glass, 9-12 parts of polyester resin and 2-3 parts of ceramic fiber. Specifically, the heat insulating agent is in a shell-core shape, and the inner cores (foam glass and ceramic fiber) of the two heat insulating agents are wrapped by the outer shell of the polyester resin, so that the heat insulating agent forms a microscopic step structure, the heat conductivity of the material is reduced, and the strength of the material is ensured.
The low-heat cement clinker comprises the following components in percentage by mass:
C2S：30~40%，
C3S：40~50%，
C3A：0.5~3%，
C4AF: 14 to 18% of C2S is dicalcium silicate and is used for improving the later strength of the concrete; c3S is tricalcium silicate and is used for improving the early strength of concrete; c3A is tricalcium aluminate and is used for improving the early strength of concrete; c4AF is tetracalcium aluminoferrite and is used for improving the toughness of a concrete structure.
The antifreezing agent is one or more of saltpeter, N-dimethylacetamide, stearic acid amide, sodium tripolyphosphate and sodium xylene sulfate.
The auxiliary components comprise an active mixed material, an early strength agent, a water reducing agent, a grinding aid and an air entraining agent; all auxiliary components in the scheme are common products sold in the market. The active mixed material is a mixed material with hydration activity and is used for promoting the setting and hardening of cement, and the active mixed material is generally a mixed material of fly ash, mineral powder, volcanic ash and the like; the early strength agent is used for improving the early strength of the concrete; the water reducing agent is used for reducing the mixing water consumption of cement; the grinding aid is used for promoting the grinding efficiency of the cement component; the air entraining agent is used to increase the air holes in the concrete structure.
The dosage of the auxiliary components is as follows according to the mass portion:
active mixed material: 5 to 10 parts by weight of a surfactant,
early strength agent: 1 to 2 parts of (A) a water-soluble polymer,
water reducing agent: 1 to 2.5 parts by weight of a stabilizer,
grinding aid: 1.5 to 3.5 parts by weight,
air entraining agent: 1-2 parts.
A preparation method of weather-resistant low-heat cement comprises the following steps:
s1: preparing a heat preservation agent:
s1.1: weighing 0.9-1.03 parts of foam glass, 9-12 parts of polyester resin and 2-3 parts of ceramic fiber by mass;
s1.2: grinding foam glass and ceramic fiber and uniformly mixing;
s1.3: melting polyester resin, adding the polyester resin into the mixture obtained in the step S1.2, and uniformly stirring;
s1.4: cooling and continuously vibrating the substance obtained in the step S1.3 to enable the polyester resin to wrap the outer surfaces of the particles of the foam glass and the ceramic fiber to form a shell-core structure, and grinding after solidification to prepare a shell-core heat preservation agent;
s2: preparing low-heat cement:
s2.1: weighing the following components in parts by mass: 70-90 parts of low-heat cement clinker, 7-9 parts of gypsum, 5-10 parts of a heat insulating agent obtained in S1, 2-4 parts of an antifreezing agent and 12-15.5 parts of an auxiliary component;
s2.2: and respectively grinding or jointly grinding the components, and uniformly mixing to obtain the weather-resistant low-heat cement. In the application of the weather-resistant low-heat cement in a concrete structure, the heat insulating agent and other components form a step heat insulating structure; specifically, a first-stage heat insulation structure is formed by gaps between the foam glass of the inner core material and the ceramic fibers, a second-stage heat insulation structure is formed by gaps between the inner core material and the shell material, and a third-stage heat insulation structure is formed by gaps between the heat insulation agent and other components in the cement; under the combined action of the three-level heat insulation structure, the overall heat conductivity of the concrete structure is reduced, and the concrete structure is effectively prevented from cracking in severe temperature change environments.
Example 1:
the weather-resistant low-heat cement comprises the following components in parts by mass: 70 parts of low-heat cement clinker, 8 parts of gypsum, 8 parts of heat preservation agent, 3 parts of antifreezing agent, 6 parts of active mixed material, 1 part of early strength agent, 2 parts of water reducing agent, 2 parts of grinding aid and 1 part of air entraining agent; wherein, the foam glass in the heat insulating agent: polyester resin: the mass ratio of the ceramic fibers is 0.9:10: 3; the antifreezing agent is saltpeter; the percentage of each component in the low-heat cement clinker is C2S：40%，C3S：40%，C3A：3%，C4AF：17%。
The preparation method comprises the following steps: firstly, grinding and uniformly mixing foam glass and ceramic fiber, then adding molten polyester resin into the mixture, uniformly stirring, cooling and continuously vibrating, and grinding after solidification to prepare the shell-core-shaped heat preservation agent. The heat insulating agent and other components are uniformly mixed and ground to obtain the weather-resistant low-heat cement.
Example 2:
the weather-resistant low-heat cement comprises the following components in parts by mass: 80 parts of low-heat cement clinker, 8 parts of gypsum, 6 parts of heat insulating agent, 2 parts of antifreezing agent, 7 parts of active mixed material, 2 parts of early strength agent, 2 parts of water reducing agent, 3 parts of grinding aid and 1 part of air entraining agent; wherein, the foam glass in the heat insulating agent: polyester resin: the mass ratio of the ceramic fibers is 1:11: 2; the antifreezing agent is stearic acid amide; the percentage of each component in the low-heat cement clinker is C2S：39%，C3S：46%，C3A：1%，C4AF: 14 percent. The preparation method is the same as example 1.
Example 3:
the weather-resistant low-heat cement comprises the following components in parts by mass: 90 parts of low-heat cement clinker, 8 parts of gypsum, 10 parts of heat preservation agent, 2 parts of antifreezing agent, 10 parts of active mixed material, 2 parts of early strength agent, 1 part of water reducing agent, 1.5 parts of grinding aid and 1 part of air entraining agent; wherein, the foam glass in the heat insulating agent: polyester resin: the mass ratio of the ceramic fibers is 1:12: 3; the antifreezing agent is N, N-dimethylacetamide; the percentage of each component in the low-heat cement clinker is C2S：35%，C3S：46%，C3A：2%，C4AF: 17 percent. The preparation method is the same as example 1.
Example 4:
the weather-resistant low-heat cement comprises the following components in parts by mass: 80 parts of low-heat cement clinker, 9 parts of gypsum, 7 parts of heat preservation agent, 4 parts of antifreezing agent, 5 parts of active mixed material, 1.5 parts of early strength agent, 2.5 parts of water reducing agent, 3.5 parts of grinding aid and 2 parts of air entraining agent; wherein, the foam glass in the heat insulating agent: polyester resin: the mass ratio of the ceramic fibers is 1.03:9: 2; the antifreezing agent is sodium tripolyphosphate; the percentage of each component in the low-heat cement clinker is C2S：31.5%，C3S：50%，C3A：0.5%，C4AF: 18 percent. The preparation method is the same as example 1.
Example 5:
the weather-resistant low-heat cement comprises the following components in parts by mass: 90 parts of low-heat cement clinker, 7 parts of gypsum, 5 parts of heat preservation agent, 3 parts of antifreezing agent, 8 parts of active mixed material, 2 parts of early strength agent, 1.5 parts of water reducing agent, 1.5 parts of grinding aid and 1.5 parts of air entraining agent; wherein, the foam glass in the heat insulating agent: polyester resin: the mass ratio of the ceramic fibers is 1:11: 2.5; the antifreezing agent is sodium xylene sulfate; the percentage of each component in the low-heat cement clinker is C2S：30%，C3S：49%，C3A：3%，C4AF: 18 percent. The preparation method is the same as example 1.
The weather-resistant low-heat cement of the embodiment 1-5 is subjected to performance test by applying a conventional detection method in the field, and a commercially available common low-heat cement is taken as a comparative example, and the test results are shown in table 1:
TABLE 1 test results
As can be seen from the test results in Table 1, the compressive strength and hydration heat parameters of the weather-resistant low-heat cement are equivalent to those of the common low-heat cement; the freeze-thaw resistant cycle times of the weather-resistant low-heat cement are more than or equal to 310 and are obviously higher than the freeze-thaw resistant cycle times of 150 times of the common low-heat cement. The weather-resistant low-heat cement prepared according to the technical scheme of the invention has excellent freeze-thaw cycle resistance, can better adapt to extreme application environments, and improves the cracking resistance and weather resistance of a concrete structure.
The disclosure of the present application also includes the following points:
(1) the embodiment disclosed by the scheme only relates to a part of the technical scheme of the scheme;
(2) in case of conflict, the embodiments and features of the embodiments disclosed in this application can be combined with each other to arrive at new embodiments;
the above embodiments are only examples disclosed in the present application, but the scope of the present disclosure is not limited thereto, and those skilled in the art should be able to change some of the technical features of the present disclosure within the scope of the present application.
Claims (7)
1. The weather-resistant low-heat cement is characterized by comprising the following components in parts by mass:
low-heat cement clinker aggregate: 70-90 parts of gypsum: 7-9 parts of a heat preservation agent: 5-10 parts of an antifreezing agent: 2-4 parts of auxiliary components: 12 to 15.5 portions.
2. The weather-resistant low-heat cement as claimed in claim 1, wherein the heat-insulating agent comprises the following components in parts by mass:
0.9-1.03 parts of foam glass, 9-12 parts of polyester resin and 2-3 parts of ceramic fiber.
3. The weather-resistant low-heat cement as claimed in claim 1, wherein the low-heat cement clinker comprises the following components in percentage by mass:
C2S：30~40%，
C3S：40~50%，
C3A：0.5~3%，
C4AF：14~18%。
4. the weather-resistant low-heat cement as claimed in claim 1, wherein the anti-freezing agent is one or more of saltpeter, N-dimethylacetamide, stearamide, sodium tripolyphosphate and sodium xylene sulfate.
5. The weather-resistant low-heat cement as claimed in claim 1, wherein the auxiliary ingredients comprise active mixing materials, early strength agents, water reducing agents, grinding aids and air entraining agents.
6. The weather-resistant low-heat cement as claimed in claim 5, wherein the auxiliary components are used in the following amounts by mass:
active mixed material: 5 to 10 parts by weight of a surfactant,
early strength agent: 1 to 2 parts of (A) a water-soluble polymer,
water reducing agent: 1 to 2.5 parts by weight of a stabilizer,
grinding aid: 1.5 to 3.5 parts by weight,
air entraining agent: 1-2 parts.
7. The preparation method of the weather-resistant low-heat cement is characterized by comprising the following steps of:
s1: preparing a heat preservation agent:
s1.1: weighing 0.9-1.03 parts of foam glass, 9-12 parts of polyester resin and 2-3 parts of ceramic fiber by mass;
s1.2: grinding foam glass and ceramic fiber and uniformly mixing;
s1.3: melting polyester resin, adding the polyester resin into the mixture obtained in the step S1.2, and uniformly stirring;
s1.4: cooling and continuously vibrating the substance obtained in the step S1.3, solidifying and grinding to obtain a shell-core-shaped heat preservation agent;
s2: preparing low-heat cement:
s2.1: weighing the following components in parts by mass: 70-90 parts of low-heat cement clinker, 7-9 parts of gypsum, 5-10 parts of a heat insulating agent obtained in S1, 2-4 parts of an antifreezing agent and 12-15.5 parts of an auxiliary component;
s2.2: and respectively grinding or jointly grinding the components, and uniformly mixing to obtain the weather-resistant low-heat cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011370838.1A CN112321179B (en) | 2020-11-30 | 2020-11-30 | Weather-resistant low-heat cement and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011370838.1A CN112321179B (en) | 2020-11-30 | 2020-11-30 | Weather-resistant low-heat cement and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112321179A true CN112321179A (en) | 2021-02-05 |
| CN112321179B CN112321179B (en) | 2022-03-04 |
Family
ID=74309172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011370838.1A Active CN112321179B (en) | 2020-11-30 | 2020-11-30 | Weather-resistant low-heat cement and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112321179B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772955A (en) * | 2022-04-19 | 2022-07-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | High-performance cement and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055725A (en) * | 1991-05-20 | 1991-10-30 | 中国建筑材料科学研究院水泥科学研究所 | Vertical kiln with low heat consumption burns the production technique of high strength clinker |
| CN103864320A (en) * | 2014-03-19 | 2014-06-18 | 广西鱼峰集团有限公司 | Low heat Portland slag cement and production method thereof |
| JP2018162199A (en) * | 2017-03-27 | 2018-10-18 | 宇部興産株式会社 | Cement composition and method for producing the same |
| CN110615627A (en) * | 2019-09-02 | 2019-12-27 | 中国建筑材料科学研究总院有限公司 | Early-strength low-heat cement for railway engineering and preparation method thereof |
-
2020
- 2020-11-30 CN CN202011370838.1A patent/CN112321179B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055725A (en) * | 1991-05-20 | 1991-10-30 | 中国建筑材料科学研究院水泥科学研究所 | Vertical kiln with low heat consumption burns the production technique of high strength clinker |
| CN103864320A (en) * | 2014-03-19 | 2014-06-18 | 广西鱼峰集团有限公司 | Low heat Portland slag cement and production method thereof |
| JP2018162199A (en) * | 2017-03-27 | 2018-10-18 | 宇部興産株式会社 | Cement composition and method for producing the same |
| CN110615627A (en) * | 2019-09-02 | 2019-12-27 | 中国建筑材料科学研究总院有限公司 | Early-strength low-heat cement for railway engineering and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772955A (en) * | 2022-04-19 | 2022-07-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | High-performance cement and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112321179B (en) | 2022-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Polat | The effect of antifreeze additives on fresh concrete subjected to freezing and thawing cycles | |
| Karagöl et al. | The influence of calcium nitrate as antifreeze admixture on the compressive strength of concrete exposed to low temperatures | |
| CN109293301B (en) | Anti-freezing concrete | |
| CN102276218B (en) | Low negative temperature post-tensioned beam prestress pipeline mudjacking material | |
| CN103626449B (en) | A kind of frost-resistant concrete and preparation method thereof | |
| KR20090036952A (en) | Concrete composition for tunnel lining | |
| CN109095835B (en) | Frost crack resistant concrete and preparation method thereof | |
| CN109400064B (en) | Calcium sulfate whisker aerogel foam concrete and preparation method thereof | |
| CN112321179B (en) | Weather-resistant low-heat cement and preparation method thereof | |
| CN111875302A (en) | Light high-strength lightweight aggregate concrete and pouring method thereof | |
| CN110563433A (en) | magnesium phosphate cement-sulphoaluminate cement concrete and preparation method thereof | |
| CN111875311B (en) | Anti-freezing concrete and preparation process thereof | |
| CN113526940A (en) | Anti-freezing inorganic quick-setting grouting material and preparation method thereof | |
| CN113511863A (en) | High-performance anti-freezing concrete and preparation method thereof | |
| JP6130767B2 (en) | Mortar or concrete composition with improved frost resistance using blast furnace slag fine aggregate, molded product formed by molding the same, and method for producing molded product | |
| CN112979241A (en) | Anti-freezing concrete and preparation method thereof | |
| CN116041011B (en) | Anti-freezing concrete containing micro-nano SAP holes and preparation method thereof | |
| KR102116577B1 (en) | Self-heating ceramic mortar composition which can be repaired in cold winter environment and cold warehouse floor and construction method of winter concrete structure using same | |
| CN112321322B (en) | Interface agent for repairing frozen damaged concrete and preparation and repair methods thereof | |
| CN108623231A (en) | A kind of lightweight aggregate concrete and preparation method thereof | |
| CN112851240A (en) | Winter fertilization micro-expansion concrete and preparation method thereof | |
| JP5953247B2 (en) | Composition for mortar or concrete having improved frost damage resistance using blast furnace slag, molded product obtained by molding the composition, repair material and repair method | |
| CN114213078A (en) | Wet spraying method cement micro-bead combined gel system sprayed concrete repairing and reinforcing material | |
| CN111848068A (en) | Rapid repair mortar for horizontal surface defects and preparation method thereof | |
| CN112897952B (en) | Anti-freezing concrete member and production process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 1 Guanzhuang Dongli, Chaoyang District, Beijing Applicant after: Zhongyanyi Technology Co.,Ltd. Address before: 1 Guanzhuang Dongli, Chaoyang District, Beijing Applicant before: Beijing Zhongyanyi Engineering Technology Development Center Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |