CN115710106A - Ultrahigh-performance seawater coral sand concrete and preparation method thereof - Google Patents
Ultrahigh-performance seawater coral sand concrete and preparation method thereof Download PDFInfo
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- CN115710106A CN115710106A CN202211065231.1A CN202211065231A CN115710106A CN 115710106 A CN115710106 A CN 115710106A CN 202211065231 A CN202211065231 A CN 202211065231A CN 115710106 A CN115710106 A CN 115710106A
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- 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 an ultra-high performance seawater coral sand concrete and a preparation method thereof, wherein the components of the ultra-high performance seawater coral sand concrete comprise cement, silica fume, fly ash, seawater, coral sand, a polycarboxylic acid high-efficiency water reducing agent, a polyether shrinkage reducing agent and a self-prepared additive mixed by fatty acid salts.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to ultra-high-performance seawater coral sand concrete and a preparation method thereof.
Background
In recent years, with the high importance of our country on the rush repair and rush construction of military engineering, the research on coral reef sand seawater concrete technology is firstly and secondly supported by the military and locally, the important progress is made in the technical field of coral reef sand seawater concrete, and the problem that the coral reef sand seawater concrete exists from scratch is better solved.
Compared with the common river sand, the coral aggregates have more internal pores, lower strength and high water absorption, more water and water reducing agent are required to be added when the coral aggregates are used for preparing concrete, and finally, a large amount of pore defects are generated in the concrete, and the obtained seawater coral concrete has lower strength, limited impermeability and poor volume stability. The seawater used as the mixing water can also cause the chloride ion content of concrete to be higher, under the condition of poor compactness, the chloride ion permeation and migration speed can be higher, and the service life of structural steel bars, especially the structural steel bars with thin protective layers, is difficult to guarantee even if an anticorrosive coating is used for protecting the structural steel bars, and is difficult to better adapt to the harsh service environment of the island with high humidity and high salinity.
The method for eliminating the coarse aggregate and improving the good interface wettability of the fine aggregate is a main method for realizing the homogenization of the cement-based composite material, can eliminate the macroscopic defects of the material, reduce the gaps and 'water pockets' between the aggregate and the slurry and improve the mechanical property of the concrete material; the polyether shrinkage reducing agent can reduce the drying shrinkage of concrete and reduce cracks generated by deformation of materials, and admixtures such as silica fume and the like are used for partially replacing cement, so that the temperature cracks caused by rapid release of hydration heat of cement with higher admixture amount can be relieved; the carboxylic acid group of the fatty acid salt substance can be complexed with calcium ions in concrete to form precipitates to partially block pores in the concrete, and the long-chain alkyl group of the fatty acid salt substance can form a hydrophobic film on the surfaces of the precipitates to form a reverse capillary effect so as to improve the impermeability of the concrete; the cement sand-wrapped concrete stirring process can enhance the interface bonding between the aggregate and the slurry, can also plug the pores on the surface of the coral aggregate, and greatly improves the strength impermeability and the durability of the concrete.
The prepared seawater coral concrete guided by the traditional concrete design method has obvious defects in structure, various performance indexes are also at a lower level, the urgent requirements of island reef permanent engineering construction and military engineering rush repair rush construction on the ultrahigh-performance seawater coral concrete are difficult to meet, and a novel design concept for standby is urgently needed to develop the ultrahigh-performance seawater coral concrete which is prepared from local raw materials of islands and can adapt to the harsh service environment of the island reef.
Disclosure of Invention
The invention aims to provide an ultra-high performance seawater coral sand concrete and a preparation method thereof, which are used for solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the ultra-high performance seawater coral sand concrete comprises the following components:
the cement is prepared by mixing the raw materials of cement,
the silicon ash is used as the raw material of the silicon ash,
the fly ash is mixed with the coal ash,
the seawater is used as the feed for the seawater,
the coral sand is prepared by the following steps of,
the self-prepared additive is added into the mixture,
wherein the self-prepared additive is a mixture of a polycarboxylic acid high-efficiency water reducing agent, a polyether shrinkage reducing agent and a fatty acid salt waterproof agent.
Preferably, the weight parts of the components are as follows: 55-75 parts of cement, 10-30 parts of silica fume, 10-20 parts of fly ash, 17-20 parts of seawater, 128-132 parts of coral sand and 2-2.5 parts of self-prepared additive.
Preferably, the coral sand is a product obtained by crushing natural coral reefs, wherein the content of CaCO3 is more than 97%, the grain sizes of the coral sand are 1.18-2.36 mm in proportion to 10.96%, 0.6-1.18 mm in proportion to 41.25%, 0.3-0.6 mm in proportion to 39.36%, 0.15-0.3 mm in proportion to 7.3%, and coral powder less than 0.15 in proportion to 1.2%.
Preferably, the cement is Czochralski PO 525-grade ordinary Portland cement; siO in the silica fume 2 The content is more than 90 percent, and the specific surface area is 2.1 multiplied by 10 4 m 2 (iii) the density of the fly ash is 2700kg/m 3 Specific surface area 450m 2 /kg。
The preferable polycarboxylic acid high-efficiency water reducing agent, the polyether shrinkage reducing agent and the fatty acid salt are 100 parts by weight.
A preparation method of the ultra-high performance seawater coral sand concrete comprises the following steps:
m1, weighing a proper amount of coral sand in parts by weight, putting the coral sand into a stirrer, adding a proper amount of seawater, and stirring for 2-3min to fully wet the coral sand;
m2, weighing a proper amount of cement, silica fume and fly ash in parts by weight, sequentially adding the cement, silica fume and fly ash into the product obtained in the step M1, and continuously stirring to wrap the surface of the coral sand;
m3, mixing a proper amount of polycarboxylic acid high-efficiency water reducing agent, polyether shrinkage reducing agent and fatty acid salt in parts by weight, and fully dissolving in seawater;
m4, mixing the products of the steps M3 and M2;
and M5, continuously stirring for 3-5min to obtain the ultra-high performance seawater coral sand concrete.
Preferably, in order to ensure the uniformity of each preparation, the seawater is a solution with the salt content of 3.75% prepared by seawater raw salt and tap water, so as to avoid the influence of the salt content of seawater in different sea areas.
Preferably, in the step M4, the products of the step M3 are added to the product of the step M2 in sequence, and the adding time is controlled to be less than 1min.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention uses seawater as mixing water to replace traditional fresh water, uses coral sand as aggregate to replace traditional sand, reduces the storage and transportation cost of concrete raw materials, ensures the timeliness of raw material supply, is suitable for emergency repair and rush construction of island shelter and caisson facility construction, and has the advantages of high strength, good volume stability and excellent permeability resistance, and can be suitable for the construction of important structural members of island engineering, the construction of prefabricated members of island engineering, the construction of high-durability buildings of island engineering, the construction and reinforcement of permanent structures of island engineering and the building and repair of buildings with high obdurability requirements of island engineering.
2. According to the technical scheme, the homogenization technology and the cement sand-wrapped stirring technology are adopted, the characteristics of seawater and coral sand are combined, the multifunctional composite additive and the active admixture are added, the macroscopic defects of concrete are obviously reduced, the compactness and the aggregate-slurry interface bonding of the concrete are fully improved, and the mechanical property of the prepared seawater coral sand concrete is greatly improved.
3. The addition of the self-prepared admixture enables the surface, the interface and the pores in the slurry of the concrete aggregate to be filled and blocked, the shrinkage cracks and the temperature cracks to be limited, the seepage channels of the concrete are greatly reduced, the permeation of harmful ions such as chloride, sulfate and the like can be effectively prevented, and the concrete aggregate can be stably used in severe sea island environments with high temperature, high humidity and high salt for a long time.
Drawings
FIG. 1 is a surface morphology of an ultra-high performance seawater coral sand concrete sample prepared according to the scheme of the application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The ultra-high performance seawater coral sand concrete comprises the following components, by weight, 70 parts of Lafaji base PO 525-grade ordinary portland cement;
SiO 2 the content is more than 90 percent, and the specific surface area is 2.1 multiplied by 10 4 m 2 20 parts of silica fume per kg;
the density is 2700kg/m 3 Specific surface area 450m 2 10 parts of I-grade fly ash/kg;
18 parts of prepared seawater with the salt content of 3.75 percent, which is prepared by using seawater raw salt and tap water;
130 parts of coral sand, which is taken from certain island coral reef in south China sea and mainly comprises CaCO 3 (the content is more than 97 percent), the coral powder is obtained after being crushed by a sand making machine, the particle size distribution of the coral powder is 10.96 percent by weight, 41.25 percent by weight, 39.36 percent by weight, 7.3 percent by weight and 7.3 percent by weight, wherein the particle size distribution of the coral powder is 1.18 to 2.36mm, 41.25 percent by weight, 0.3 to 0.18 mm and less than 0.15 percent by weight.
2.5 parts of self-prepared additive, wherein the self-prepared additive is prepared from polycarboxylic acid high-efficiency water reducing agent, polyether shrinkage reducing agent and fatty acid salt waterproof agent according to the mass ratio of 1:0.78:0.86, and the pH of the preparation is 9.3, wherein the solid content is 0.75, and the water reduction rate is 28 percent.
In the specific preparation process, the raw materials are mixed,
firstly, a solution with salt content of 3.75 percent prepared by using seawater raw salt and tap water is used for standby.
Then, the relevant raw materials in the above weight parts are prepared.
Mixing the weighed coral sand with proper amount of prepared seawater, adding into a stirrer, and stirring for 2-3min to fully wet the coral sand;
and sequentially adding the cement, the silica fume and the fly ash into a stirrer to be fully mixed with the coral sand in the previous step, so that the surface of the coral sand is coated with a layer of cementing material.
Mixing the polycarboxylic acid high-efficiency water reducing agent, the polyether shrinkage reducing agent and the fatty acid salt waterproof agent according to the proportion, taking the corresponding parts by weight, mixing with the rest prepared seawater, adding the mixture into the mixture in the previous step within 1min, and continuously stirring for 3-5min to obtain the ultrahigh-performance seawater coral sand concrete.
In order to characterize the performance of the prepared seawater coral sand concrete, the seawater coral sand concrete is detected, an electron microscope image of the surface morphology of the seawater coral sand concrete is shown in figure 1, through the action of silica fume, coal ash, cement and coral sand matched with a self-prepared additive, the surface, interface and pores in slurry of concrete aggregate can be filled and plugged, shrinkage cracks and temperature cracks are limited, seepage channels of the concrete are greatly reduced, and therefore the penetration of harmful ions such as chloride, sulfate and the like can be effectively prevented, the seawater coral sand concrete prepared by the preparation method has good compactness and anti-permeability, the porosity is only 7.21%, the anti-permeability grade can reach P10, and the diffusion coefficient of chloride ions is only 1.83 multiplied by 10 -12 m 2 And/s is greatly reduced compared with the traditional method.
In addition, the fluidity of the sheet reaches 174mm, the compression strength of a 28d cube is 122.0MPa, the elastic modulus is 40.16MPa, the bending strength is 20.3MPa, the maximum load of the sheet in four-point bending is 28.45kN, and the tensile strength of the sheet in splitting is 11.33MPa.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An ultra-high performance seawater coral sand concrete is characterized in that,
comprises the following components:
the cement is prepared by mixing the raw materials of cement,
the silicon ash is added into the silicon powder,
the fly ash is mixed with the coal ash,
the seawater is used as the feed for the seawater,
the coral sand is prepared by the following steps of,
the self-prepared additive is added into the mixture,
wherein the self-prepared admixture is a mixture of a polycarboxylic acid high-efficiency water reducing agent, a polyether shrinkage reducing agent and a fatty acid salt waterproof agent.
2. The ultra-high performance seawater coral sand concrete as claimed in claim 1, wherein the weight parts of each component are:
55-75 parts of cement
10-30 parts of silica fume
10-20 parts of fly ash
17-20 parts of seawater
128-132 parts of coral sand
2-2.5 parts of self-prepared additive.
3. The ultra-high performance seawater coral sand concrete of claim 1, wherein the coral sand is a pulverized product of a natural coral reef, wherein the CaCO3 content is more than 97%.
4. The ultra-high performance seawater coral sand concrete of claim 1, wherein said cement is Lashoji PO 525 grade Portland cement; siO in the silica fume 2 The content is more than 90 percent, and the specific surface area is 2.1 multiplied by 10 4 m 2 (iii) the density of the fly ash is 2700kg/m 3 Specific surface area 450m 2 /kg。
5. The ultra-high performance seawater coral sand concrete of claim 1, wherein the weight ratio of the polycarboxylic acid high-efficiency water reducer, the polyether shrinkage reducing agent and the fatty acid salts is 100 parts by weight.
6. The preparation method of the ultra-high performance seawater coral sand concrete is characterized by comprising the following steps:
m1, weighing a proper amount of coral sand in parts by weight, putting the coral sand into a stirrer, adding a proper amount of seawater, and stirring for 2-3min to fully wet the coral sand;
m2, weighing a proper amount of cement, silica fume and fly ash in parts by weight, sequentially adding the cement, silica fume and fly ash into the product obtained in the step M1, and continuously stirring to wrap the surface of the coral sand;
m3, mixing a proper amount of polycarboxylic acid high-efficiency water reducing agent, polyether shrinkage reducing agent and fatty acid salt in parts by weight, and fully dissolving in seawater;
m4, mixing the products of the steps M3 and M2;
and M5, continuously stirring for 3-5min to obtain the ultra-high performance seawater coral sand concrete.
7. The method for preparing the ultra-high performance seawater coral sand concrete according to claim 6, wherein the seawater is a solution prepared from seawater raw salt and tap water and having a salt content of 3.75%.
8. The method for preparing the ultra-high performance seawater coral sand concrete of claim 6, wherein in the step M4, the product of the step M3 is added to the product of the step M2 in the sequence, and the adding time is controlled to be less than 1min.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110372298A (en) * | 2019-07-24 | 2019-10-25 | 桂林理工大学 | A kind of preparation method of high-strength coral concrete |
| CN111620620A (en) * | 2020-05-09 | 2020-09-04 | 中国人民解放军军事科学院国防工程研究院 | Seawater-mixed ultra-high performance concrete with full coral aggregate and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110372298A (en) * | 2019-07-24 | 2019-10-25 | 桂林理工大学 | A kind of preparation method of high-strength coral concrete |
| CN111620620A (en) * | 2020-05-09 | 2020-09-04 | 中国人民解放军军事科学院国防工程研究院 | Seawater-mixed ultra-high performance concrete with full coral aggregate and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张巨松，许峰，佟钰主编: "《混凝土原材料》", pages: 82 - 85 * |
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