CN114394813B - Anti-freezing super-sulfur cement concrete and preparation method thereof - Google Patents
Anti-freezing super-sulfur cement concrete and preparation method thereof Download PDFInfo
- Publication number
- CN114394813B CN114394813B CN202210138507.8A CN202210138507A CN114394813B CN 114394813 B CN114394813 B CN 114394813B CN 202210138507 A CN202210138507 A CN 202210138507A CN 114394813 B CN114394813 B CN 114394813B
- Authority
- CN
- China
- Prior art keywords
- sulfur cement
- ultra
- composite additive
- stirring
- concrete
- 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.)
- Active
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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses antifreeze ultra-sulfur cement concrete and a preparation method thereof. The prepared ultra-sulfur cement concrete has high strength on one hand, and the salt freezing resistance of the ultra-sulfur cement concrete is obviously improved on the other hand; the method is simple and easy to implement, greatly reduces the production cost, simultaneously reduces the environmental pollution, and has both economic benefit and environmental benefit.
Description
Technical Field
The invention relates to antifreeze and super-sulfur cement concrete and a preparation method thereof, belonging to the technical field of material chemistry.
Background
The cement concrete has high strength and long service life, and can be made into different shapes according to requirements, so that the cement concrete becomes a building material with the largest use amount and the widest application. It is reported that the carbon dioxide emission in portland cement production is 7% to 10% of the total emission, and that the production of one ton of portland cement is accompanied by one ton of carbon dioxide emission. Meanwhile, a large amount of energy is consumed in the production process, which is contrary to the concept of environmental protection and sustainable development. The ultra-sulfur cement is used as a novel green cementing material, consists of a large amount of industrial solid waste slag, gypsum and a small amount of portland cement, is low-carbon and energy-saving in production, and is considered as a potential substitute of the portland cement.
However, poor freezing resistance remains one of the major disadvantages of current ultra-sulfur cement concretes. Especially, under the condition of salt freezing, in severe cold environment, when chloride salt corrosion and freeze-thaw cycle act simultaneously, namely, salt freezing, the ultra-sulfur cement concrete is remarkably damaged, and the engineering use of the ultra-sulfur cement concrete is seriously influenced.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problem of poor frost resistance of the ultra-sulfur cement concrete in the prior art, the invention provides the frost-resistant ultra-sulfur cement concrete and the preparation method of the cement concrete.
The technical scheme is as follows: the antifreeze super-sulfur cement concrete comprises the following components in percentage by mass: 15-25% of ground super-sulfur cement mixture, 24-34% of sand, 40-48% of stone, 3-6% of composite additive and the balance of water; the composite additive comprises the following components in percentage by mass: 5 to 8 percent of water reducing agent, 0.1 to 0.3 percent of air entraining agent, 10 to 20 percent of sodium lactate, 5 to 10 percent of nano silicon dioxide and the balance of water.
Preferably, the ground super-sulfur cement mixture consists of the following components in percentage by mass: 72-78% of slag, 17-23% of desulfurized gypsum and 3-7% of portland cement.
Preferably, the water reducing agent in the composite additive is a polycarboxylic acid water reducing agent.
Preferably, the particle size of the nano silicon dioxide in the composite additive is 7-40nm.
The preparation method of the anti-freezing ultra-sulfur cement concrete comprises the following steps:
(1) Preparing a ground super-sulfur cement mixture: mixing the slag, the desulfurized gypsum and the portland cement, and grinding to obtain a ground super-sulfur cement mixture;
(2) Preparing a composite additive: adding water, water reducing agent and nano silicon dioxide according to a certain proportion, and stirring at a low speed; adding sodium lactate, and stirring at high speed; adding an air entraining agent, and stirring slowly to obtain a composite additive;
(3) The composite additive is dispersed by ultrasonic, then the ultra-sulfur cement mixture and the composite additive are mixed and ground, and finally sand, stone and water are added to prepare the anti-freezing ultra-sulfur cement concrete.
Preferably, the desulfurized gypsum is CaSO 4 ·1/2H 2 O。
Preferably, the low-speed stirring is carried out, the rotating speed is less than 1500rpm, and the time is 1-3 min; stirring at high speed, wherein the rotating speed is 6000-7500 rpm, and the time is 8-10 min; the slow stirring speed is less than 300rpm, and the time is 3-5 min.
Preferably, in the step (3), before the composite additive is used, ultrasonic treatment is carried out for 10-15 min.
When different substances are added, a better dispersing effect can be achieved corresponding to different stirring speeds. Water, water reducing agent, nano silicon dioxide: stirring at low speed to disperse the nano silicon dioxide, simultaneously using the water reducing agent as a dispersion medium, wherein the initial speed is not high enough and the low speed (less than or equal to 1500 rpm) is adopted; sodium lactate: further adding sodium lactate, stirring at high speed (6000-7500 rpm), and making sodium lactate and silicon dioxide fully act while dispersing; air entraining agent: finally, adding an air entraining agent, stirring at a slow speed (less than or equal to 300 rpm) to prevent the solution from generating a large amount of bubbles when the speed is too high. The addition of the composite additive in the concrete can introduce proper bubbles, reduce intercommunicating pores, increase closed pores, improve the pore structure of the concrete, greatly reduce the expansion pressure of pores caused by freezing and improve the frost resistance; on the other hand, the slag dissolution is promoted, the hydration degree of the system is increased, and the strength is improved; therefore, after the composite additive is added into the concrete, the frost resistance of the concrete can be met, and the strength of the concrete can be improved.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) The high-performance ultra-sulfur cement concrete has the advantages that the salt freezing resistance is obviously improved, the stripping quality is reduced by about 58% after 64 times of single-side salt freezing circulation, the high strength is realized, and the 28d compressive strength can be increased by about 29%; the addition of the composite additive does not influence the preparation process of the concrete; the composite additive and the raw materials are simple and easy to obtain, and the composite additive is low in cost, low in carbon and green;
(2) According to the preparation method of the high-performance ultra-sulfur cement concrete, the ground ultra-sulfur cement mixture is prepared in advance, the slurry is prepared firstly in the preparation process of the ultra-sulfur cement concrete, and then the coarse and fine aggregates (sand and stone) are added, so that on one hand, the raw materials can fully absorb moisture, and meanwhile, the slurry can better wrap the aggregates to synergistically improve the strength of the concrete.
Detailed Description
The technical solution of the present invention is further explained below.
Example 1
(1) Preparing 20kg of ground ultra-sulfur cement mixture: taking 15kg of slag, 4kg of desulfurized gypsum and 1kg of Portland cement, mixing and grinding to obtain the cement;
(2) Preparing 3kg of composite additive: adding 2124g of water, 195g of water reducing agent and 225g of nano silicon dioxide according to the proportion, and stirring at 1300rpm for 3min; adding 450g of sodium lactate, stirring at 7000rpm for 10min; adding 6g of air entraining agent and stirring for 5min at 200rpm to obtain the composite additive;
(3) The composite additive is dispersed by ultrasonic, then the ultra-sulfur cement mixture and the composite additive are mixed and ground, and finally 27.6kg of sand, 41.4kg of stone and 4.598kg of water are added to prepare the anti-freezing ultra-sulfur cement concrete.
And (3) after stirring, forming the concrete, removing the formwork after 1d, moving the concrete into a standard curing room, curing for 28d, and performing concrete strength test, single-side freeze-thaw test and the like. The results are shown in tables 1 to 4.
Example 2
(1) Preparing 20kg of ground ultra-sulfur cement mixture: taking 15kg of slag, 4kg of desulfurized gypsum and 1kg of Portland cement, mixing and grinding to obtain the cement;
(2) Preparing 4kg of composite additive: adding 2832g of water, 260g of water reducing agent and 300g of nano silicon dioxide according to the proportion, and stirring for 3min at 1500rpm; adding sodium lactate 600g, and stirring at 7500rpm for 10min; adding air entraining agent 8g, stirring at 300rpm for 5min to obtain composite additive;
(3) Ultrasonically dispersing the composite additive, mixing and grinding the ultra-sulfur cement mixture and the composite additive, and adding 27.6kg of sand, 41.4kg of stone and 3.798kg of water to prepare the anti-freezing ultra-sulfur cement concrete.
And (3) after stirring, forming the concrete, removing the formwork after 1d, moving the concrete into a standard curing room, curing for 28d, and performing concrete strength test, single-side freeze-thaw test and the like. The results are shown in tables 1 to 4.
Example 3
(1) Preparing 20kg of a ground super-sulfur cement mixture: taking 15kg of slag, 4kg of desulfurized gypsum and 1kg of portland cement, mixing and grinding to obtain the cement;
(2) Preparing 5kg of composite additive: 3540g of water, 325g of water reducing agent and 375g of nano silicon dioxide are added according to the proportion, and the mixture is stirred for 3min at 1000rpm; adding 750g of sodium lactate, and stirring at 6000rpm for 9min; adding air entraining agent (10g) and stirring at 200rpm for 4min to obtain composite additive;
(3) Ultrasonically dispersing the composite additive, mixing and grinding the ultra-sulfur cement mixture and the composite additive, and adding 27.6kg of sand, 41.4kg of stone and 2.997kg of water to prepare the anti-freezing ultra-sulfur cement concrete.
And after stirring, forming the concrete, removing the mold after 1d, moving the concrete into a standard curing room for curing to 28d, and performing concrete strength test, single-side freeze-thaw test and the like. The results are shown in tables 1 to 4.
Example 4
(1) Preparing 20kg of ground ultra-sulfur cement mixture: taking 15kg of slag, 4kg of desulfurized gypsum and 1kg of Portland cement, mixing and grinding to obtain the cement;
(2) Preparing 3kg of composite additive: 2049g of water, 195g of water reducing agent and 300g of nano silicon dioxide are added according to the proportion, and the mixture is stirred for 1min at 1500 rpm; adding 450g of sodium lactate and stirring at 7000rpm for 8min; adding 6g of air entraining agent and stirring at 300rpm for 5min to obtain the composite additive;
(3) Ultrasonically dispersing the composite additive, mixing and grinding the ultra-sulfur cement mixture and the composite additive, and adding 27.6kg of sand, 41.4kg of stone and 4.871kg of water to prepare the anti-freezing ultra-sulfur cement concrete.
And (3) after stirring, forming the concrete, removing the formwork after 1d, moving the concrete into a standard curing room, curing for 28d, and performing concrete strength test, single-side freeze-thaw test and the like. The results are shown in tables 1 to 4.
Example 5
(1) Preparing 20kg of a ground super-sulfur cement mixture: taking 15kg of slag, 4kg of desulfurized gypsum and 1kg of portland cement, mixing and grinding to obtain the cement;
(2) Preparing 3kg of composite additive: 1971g of water, 195g of water reducing agent and 225g of nano silicon dioxide are added according to the proportion, and the mixture is stirred for 3min at 1000rpm; adding sodium lactate 600g, and stirring at 7500rpm for 8min; 9g of air entraining agent is added and stirred for 3min at 250rpm to obtain the composite additive;
(3) Ultrasonically dispersing the composite additive, mixing and grinding the ultra-sulfur cement mixture and the composite additive, and adding 27.6kg of sand, 41.4kg of stone and 8978 kg of water of 4.871kg to prepare the anti-freezing ultra-sulfur cement concrete.
And (3) after stirring, forming the concrete, removing the formwork after 1d, moving the concrete into a standard curing room, curing for 28d, and performing concrete strength test, single-side freeze-thaw test and the like. The results are shown in tables 1 to 4.
Comparative example 1 addition of Water reducing agent alone
(1) Preparing 20kg of ground super-sulfur cement mixture, taking 15kg of slag, 4kg of desulfurized gypsum and 1kg of portland cement, mixing and grinding to obtain the cement;
(2) Adding 195g of water reducing agent and 5kg of water while stirring, diluting and washing the water reducing agent with water to ensure no residue, and stirring for about 4min; standing for about 30s;
(3) 27.6kg sand, 41.4kg stone, and the remainder 1.902kg water were added and stirred for about 3min. And (3) after stirring, forming the concrete, removing the formwork after 1d, moving the concrete into a standard curing room, curing for 28d, and performing concrete strength test, single-side freeze-thaw test and the like. The results are shown in tables 1 to 4.
Comparative example 2 addition of Water reducing agent, air entraining agent Only
(1) Preparing 20kg of ground super-sulfur cement mixture, taking 15kg of slag, 4kg of desulfurized gypsum and 1kg of portland cement, mixing and grinding to obtain the cement;
(2) Adding 195g of water reducing agent, 9g of air entraining agent and 3kg of water while stirring, and stirring for about 4min; standing for about 30s;
(3) 27.6kg sand, 41.4kg stone, and the remainder 1.893kg water were added and stirred for about 3min.
And after stirring, forming the concrete, removing the mold after 1d, moving the concrete into a standard curing room for curing to 28d, and performing concrete strength test, single-side freeze-thaw test and the like. The results are shown in tables 1 to 4.
In the above examples and comparative examples:
the water-cement ratio of the concrete is 0.35, and the sand rate is 0.40.
The used raw materials are as follows: the slag is S75-grade granulated blast furnace slag powder; the gypsum is desulfurized gypsum of which the main component is semi-hydrated gypsum, and the particle size is 15-20 microns; the silicate cement is P.O 42.5.5 conch cement; a polycarboxylic acid water reducing agent with solid content of 50%; a 60% sodium lactate solution; the specific surface area of the hydrophilic gas-phase nano silicon dioxide is 300m < 2 >/g, and the particle size is 7-40nm; quartz sand with the particle size of less than 5 mm; basalt broken stone with the grain diameter of 5-16 mm; tap water.
The salt freezing resistance of the ultra-sulfur cement concrete after the technology of the invention is adopted is verified, and the salt freezing resistance is shown in tables 1-3. The 28d compressive strength of the corresponding ultra-sulphur cement concrete was also tested and is shown in table 4.
TABLE 1 stripping quality (g/m) of ultra-sulfur cement concrete samples after different salt freezing cycle times 2 )
TABLE 2 dynamic elastic modulus development (%)
TABLE 3 characteristic parameters of the bubbles of the ultra-sulfur cement concrete
TABLE 4 compression Strength of ultra-sulfur Cement concrete 28d (MPa)
The reference super-sulphur cement concrete (comparative example 1) underwent 64 passesAfter the salt freezing circulation, the peeling quality reaches 1454.24 g/m 2 The moving elastic die is reduced to 86.1%; comparative example 2 with only the water reducing agent and the air entraining agent added has the stripping quality of 1200.35g/m 2 The dynamic elastic modulus is 98.1 percent, but the compressive strength is greatly reduced and is only 45.3MPa; after adding different mixing amounts of the composite additive, for example 1, example 2 and example 3, the stripping quality and the dynamic elastic modulus are 1254.42g/m2, 1045.23g/m2, 919.70g/m2 and 96.8%,98.7% and 99.3% respectively, the stripping quality is reduced, and the dynamic elastic modulus is increased; the effect is different by changing the internal components, as in example 4 and example 5, and the corresponding stripping quality and the dynamic elastic modulus are 1165.67g/m2, 1041.21g/m2, 98.7% and 99.3%, respectively, which are smaller in stripping quality and larger in dynamic elastic modulus compared with example 1.
Meanwhile, by combining the test results in tables 3 and 4, the addition of the composite additive reduces the air hole spacing coefficient and the ratio of chord length larger than 100 mu m of the ultra-sulfur cement concrete, optimizes the hole structure and improves the salt freezing resistance of the ultra-sulfur cement concrete. Meanwhile, the strength value of the concrete is reduced by adding the single air entraining agent, but the result shows that the salt freeze corrosion resistance of the ultra-sulfur cement concrete is improved and the strength is improved by using the composite additive.
The data of the examples and the comparative examples show that the use of the traditional single air entraining agent can achieve the aim of improving the frost resistance of the concrete, but can bring obvious loss of strength; sodium lactate promotes the later strength and durability by promoting the hydration of the ultra-sulfur cement, but plays a role in inhibiting in the early stage to reduce the early strength; on one hand, the nano silicon dioxide has the effect of improving the early strength, and simultaneously, the nano silicon dioxide can promote the dissociation of lactate ions and further improve the dissolving and improving capacity of sodium lactate to slag; however, the dispersibility is difficult to ensure and the workability of the concrete is negatively influenced; the water reducing agent is a polycarboxylic acid comb-type structure polymer, not only has the water reducing effect (the nano silicon dioxide has large water absorption), but also has the comb-type structure to increase the steric hindrance, thereby solving the problem that the nano silicon dioxide is easy to aggregate and combine. The addition of the composite additive enables the workability of the ultra-sulfur cement concrete to be unaffected, the frost resistance to be improved obviously and the strength to be higher.
Claims (7)
1. The anti-freezing ultra-sulfur cement concrete is characterized by comprising the following components in percentage by mass: 15% -25% of ground super-sulfur cement mixture, 24% -34% of sand, 40% -48% of stone, 3% -6% of composite additive and the balance of water; the composite additive comprises the following components in percentage by mass: 5 to 8 percent of water reducing agent, 0.1 to 0.3 percent of air entraining agent, 10 to 20 percent of sodium lactate, 5 to 10 percent of nano silicon dioxide and the balance of water;
the ground super-sulfur cement mixture consists of the following components in percentage by mass: 72-78% of slag, 17-23% of desulfurized gypsum and 3-7% of portland cement.
2. The ultra-sulfur cement concrete of claim 1, wherein the water reducing agent in the composite additive is a polycarboxylic acid water reducing agent.
3. The ultra-sulfur cement concrete according to claim 1, wherein the nano-silica in the composite additive has a particle size of 7-40nm.
4. A method of preparing the freeze resistant ultra sulfur cement concrete of claim 1, comprising the steps of:
(1) Preparing a ground super-sulfur cement mixture: mixing the slag, the desulfurized gypsum and the portland cement, and grinding to obtain a ground super-sulfur cement mixture;
(2) Preparing a composite additive: adding water, water reducing agent and nano silicon dioxide according to a certain proportion, and stirring at a low speed; adding sodium lactate, and stirring at high speed; adding an air entraining agent, and stirring at a low speed to obtain a composite additive;
(3) Ultrasonically dispersing the composite additive; mixing the ultrasonically dispersed composite additive with the ground ultra-sulfur cement mixture; and adding sand, stone and water into the mixture to obtain the anti-freezing ultra-sulfur cement concrete.
5. According to claim 4The preparation method is characterized in that in the step (1), the desulfurized gypsum is CaSO 4 ·1/2H 2 O。
6. The preparation method according to claim 4, wherein in the step (2), the low-speed stirring is carried out at a rotating speed of less than 1500rpm for 1-3 min; stirring at high speed, wherein the rotating speed is 6000-7500 rpm, and the time is 8-10 min; the slow stirring speed is less than 300rpm, and the time is 3-5 min.
7. The method according to claim 4, wherein the sonication time in step (3) is 10 to 15min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210138507.8A CN114394813B (en) | 2022-02-15 | 2022-02-15 | Anti-freezing super-sulfur cement concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210138507.8A CN114394813B (en) | 2022-02-15 | 2022-02-15 | Anti-freezing super-sulfur cement concrete and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114394813A CN114394813A (en) | 2022-04-26 |
| CN114394813B true CN114394813B (en) | 2023-03-31 |
Family
ID=81234710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210138507.8A Active CN114394813B (en) | 2022-02-15 | 2022-02-15 | Anti-freezing super-sulfur cement concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114394813B (en) |
-
2022
- 2022-02-15 CN CN202210138507.8A patent/CN114394813B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| The influence of two types of alkali activators on the microstructure and performance of supersulfated cement concrete： mitigating the strength and carbonation resistance;Yang Zhou等;《Cement and Concrete Composites》;20210118;第103947页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114394813A (en) | 2022-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111233364B (en) | Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture | |
| CN110577390B (en) | Concrete preparation process | |
| CN113248214B (en) | Machine-made sand ultrahigh-performance concrete with compressive strength of more than 180Mpa and preparation method thereof | |
| CN110845190A (en) | Ultrahigh-performance cement-based material applied to wet-process injection construction | |
| CN109942238A (en) | A kind of preparation method of quick setting and rapid hardening coal gangue alkaline excitation fast repairing material | |
| CN112573874A (en) | Preparation method of high-strength self-compacting concrete | |
| CN110698120A (en) | Precast concrete and curing method thereof | |
| CN113896453B (en) | Modified graphene composite material and preparation method thereof, cement reinforcing agent and application thereof | |
| CN111574105A (en) | Environment-friendly composite early strength water reducing agent and preparation method thereof | |
| CN113387612B (en) | Viscosity-reducing enhanced anti-cracking agent and preparation method thereof | |
| CN115724640A (en) | Gypsum slag cement concrete and preparation method thereof | |
| CN108546009B (en) | CaCO doped with multi-scale particle size3High performance concrete slurry admixture | |
| CN112919870A (en) | High-strength self-compacting concrete with recycled fine aggregate | |
| CN114394813B (en) | Anti-freezing super-sulfur cement concrete and preparation method thereof | |
| CN110845188A (en) | Sand-free macroporous concrete and preparation method thereof | |
| CN114477873B (en) | Recycled aggregate self-compacting concrete and preparation method thereof | |
| CN114804704B (en) | Environment-friendly chlorine-free cement grinding aid and production method thereof | |
| CN115594469A (en) | Low-drying-shrinkage 3D printing concrete and preparation method thereof | |
| CN115321924A (en) | Durable self-compacting filling concrete material for underground structural engineering | |
| CN114455911A (en) | Regenerated fine aggregate concrete and preparation method thereof | |
| KR102011335B1 (en) | Manufacturing Method of Hybrid Shrinkage Reducing Agent for Dry Mortar | |
| CN110615642A (en) | Concrete containing high-activity slag powder and preparation method thereof | |
| CN109574598A (en) | A kind of preparation process of environment-friendlydurable durable construction material | |
| CN117819894A (en) | Preparation method and application of anti-cracking impervious waterproof concrete | |
| CN115504754B (en) | Steel pipe concrete based on solid waste expansion and preparation method 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |