CN112537941B - Seawater coral aggregate concrete for rush repair and rush construction engineering and preparation method thereof - Google Patents
Seawater coral aggregate concrete for rush repair and rush construction engineering and preparation method thereof Download PDFInfo
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- CN112537941B CN112537941B CN202011408000.7A CN202011408000A CN112537941B CN 112537941 B CN112537941 B CN 112537941B CN 202011408000 A CN202011408000 A CN 202011408000A CN 112537941 B CN112537941 B CN 112537941B
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/002—Water
- C04B22/0026—Salt water, e.g. seawater
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- 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
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention provides seawater coral aggregate concrete for rush-repair and rush-construction engineering and a preparation method thereof, wherein the seawater coral aggregate concrete comprises the following raw materials in percentage by mass: 15-40% of cement, 0-5% of borax, 0-10% of fly ash, 35-70% of coral aggregate, 0.1-4% of steel fiber, 0.01-0.5% of organic fiber, 0.01-0.10% of thickening agent, 0.01-0.3% of early strength agent, 0.01-0.15% of retarder, 0.01-1.5% of water reducing agent, 0.01-7% of quick hardening agent and 5-15% of seawater. According to the invention, coral aggregates and seawater are used as the raw materials of the emergency repair and emergency construction concrete, so that the local material availability of raw materials is improved to the greatest extent, the land transportation material transportation amount and the material reserve amount in island reef emergency repair and emergency construction engineering are greatly reduced, and the problems of high dependence on land transportation materials under special emergency conditions and the like in the prior art are solved. Meanwhile, the construction process is diversified, the raw materials are in an island form, and the multi-scene applicability of the invention is greatly improved.
Description
Technical Field
The invention relates to the technical field of emergency repair and rush construction materials, in particular to seawater coral aggregate concrete for emergency repair and rush construction engineering and a preparation method thereof.
Background
In the construction of the island reef in the open sea, particularly under special emergency conditions, such as war military project facility emergency repair engineering, the emergency repair and emergency construction material is required to meet the requirements of high early strength and high construction speed, local materials are required to be obtained as far as possible, the dependence on the adoption of the traditional land transportation building material is reduced, and various construction processes and use scenes are met.
The traditional building materials, especially the sandstone aggregate, have long transportation period, high transportation cost, large storage requirement and poor economic benefit. In the prior documents, for example, CN109180116A and CN110563433A respectively propose a rush repair and rush construction material, which does not adopt coral aggregate and seawater, and is not suitable for island reef rush repair and rush construction engineering.
Disclosure of Invention
In view of the above problems, the invention aims to provide seawater coral aggregate concrete for rush repair and rush construction engineering and a preparation method thereof, so as to solve the problems of high dependence degree on land-transported building materials, long transportation period of land-transported building materials, high transportation cost and the like in the prior art.
The invention provides seawater coral aggregate concrete for rush-repair and rush-construction projects, which comprises the following raw materials in percentage by mass:
15-40% of cement, 0-5% of borax, 0-10% of fly ash, 35-70% of coral aggregate, 0.1-4% of steel fiber, 0.01-0.5% of organic fiber, 0.01-0.10% of thickening agent, 0.01-0.3% of early strength agent, 0.01-0.15% of retarder, 0.01-1.5% of water reducing agent, 0.01-7% of quick hardening agent and 5-15% of seawater.
Preferably, the cement is any one of magnesium phosphate cement, sulphoaluminate cement and portland cement.
Preferably, the magnesium phosphate cement is any one of magnesium phosphate cements of monoammonium phosphate, magnesium phosphate cements of monopotassium phosphate, and magnesium phosphate cements of monosodium phosphate.
In addition, the preferred scheme is that the strength of the sulphoaluminate cement is more than or equal to 42.5 grade; and/or; the strength of the portland cement is greater than or equal to 42.5 grade.
In addition, the coral aggregate is preferably a mixture of naturally graded coral sand and stone.
In addition, the diameter of the steel fiber is 0.10-0.60 mm, and the length of the steel fiber is 8-30 mm; and/or; the organic fiber is polyvinyl alcohol fiber or polypropylene fiber, and the length of the organic fiber is 6-20 mm; and/or; the thickener is any one of hydroxyethyl cellulose, methyl hydroxyethyl cellulose, ethyl hydroxyethyl cellulose and methyl hydroxypropyl cellulose.
In addition, the preferable scheme is that the early strength agent comprises the following compound raw materials in percentage by mass: 10-20% of lithium carbonate and 80-90% of calcium nitrite; and/or the retarder is citric acid; and/or the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is not lower than 30%; and/or the hardening accelerator is dodecacalcium heptaluminate.
The invention provides a preparation method of seawater coral aggregate concrete for rush-repair and rush-repair engineering, which is applied to a cast-in-place construction process or a prefabrication process of the seawater coral aggregate concrete for the rush-repair and rush-repair engineering, and comprises the following steps:
weighing the raw materials according to the mass percentage;
dividing the seawater in the raw materials into two parts, namely a first part of seawater and a second part of seawater;
adding the coral aggregates in the raw materials and the first part of seawater into a stirrer, and stirring for 2min to obtain a first-stage mixed material; wherein the mass of the first part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not larger than 30 mm;
adding other raw materials except the second part of seawater and the water reducer in the raw materials into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
and adding a mixed solution of the second part of seawater and the water reducing agent into the second-stage mixed material, and stirring for 2min to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
The invention provides a preparation method of seawater coral aggregate concrete for rush-repair and rush-construction engineering, which is applied to a wet spraying construction process of the seawater coral aggregate concrete for the rush-repair and rush-construction engineering, and comprises the following steps:
Weighing the raw materials according to the mass percentage;
dividing the seawater in the raw materials into three parts, namely a first part of seawater, a second part of seawater and a third part of seawater, wherein the first part of seawater is equivalently mixed with the sum of the early strength agent and the quick hardening agent in the raw materials to serve as an accelerator;
adding the coral aggregates in the raw materials and the second part of seawater into a stirrer, and stirring for 2min to obtain a first-stage mixed material; the mass of the second part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not more than 15 mm;
adding other raw materials except the accelerator, the third part of seawater and the water reducer into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
adding a mixed solution of the water reducing agent and the third part of seawater into the second-stage mixed material, and stirring for 2min to obtain a third-stage mixed material;
and mixing the accelerator with the third-stage mixed material at a nozzle of a spraying machine and spraying to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
In addition, it is preferable that the cement in the raw material is sulphoaluminate cement or portland cement.
According to the technical scheme, the seawater coral aggregate concrete for rush-repair and rush-construction engineering and the preparation method thereof provided by the invention have the advantages that the coral aggregate and the seawater are mainly adopted, local materials are fully used, and the reserve amount of land transportation rush-repair and rush-construction raw materials is greatly reduced; by adopting the coral aggregates with natural gradation and natural moisture content, through a large amount of experimental studies and the gradation theoretical analysis after the fine screening of the coral aggregates, the mixing amount of the cementing material and the coral aggregates is optimized, and the adverse effects of the natural gradation and the grain shape of the coral aggregates on the workability and the mechanical property of the concrete are solved; in order to overcome the defect that the coral aggregate has high water absorption rate, a new preparation method is provided by actually measuring the natural water content, the water absorption rate and the water absorption rate of the coral aggregate; the influence of ions in seawater on the mechanical property of the concrete in the super early age is overcome through the addition agents such as the early strength agent, the retarder, the water reducing agent, the thickening agent and the like; the invention breaks through the engineering technical problems that the grading of the coral aggregate is difficult to control, the water content is changed greatly, the internal pore is large, the water absorption is large, and the influence of ions in seawater on the early performance of the concrete is large, and realizes that the coral aggregate concrete can be applied to actual rush repair and rush construction engineering in a large scale; the method covers the common cement types and the emergency repair and rush construction process, and can adopt different concrete preparation methods according to different construction processes, thereby effectively solving the problem that the island reef emergency repair and rush construction project depends on traditional building materials such as sand and stone on land transportation.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow chart of a preparation method of seawater coral aggregate concrete for rush-repair and rush-construction engineering in a cast-in-place construction process or a prefabrication process according to an embodiment of the invention;
FIG. 2 is a schematic flow diagram of a preparation method of seawater coral aggregate concrete for rush-repair and rush-construction engineering in a wet-jet construction process according to an embodiment of the invention.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems of high dependence degree on land transportation building materials, long transportation period of land transportation building materials, high transportation cost and the like in the prior art, the invention provides seawater coral aggregate concrete for emergency repair and rush construction engineering for island reef emergency repair and rush construction engineering and a preparation method thereof.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The seawater coral aggregate concrete for rush-repair and rush-construction engineering provided by the invention is used in the construction process of island reef rush-repair and rush-construction engineering, and comprises the following raw materials in percentage by mass:
15-40% of cement, 0-5% of borax, 0-10% of fly ash, 35-70% of coral aggregate, 0.1-4% of steel fiber, 0.01-0.5% of organic fiber, 0.01-0.10% of thickening agent, 0.01-0.3% of early strength agent, 0.01-0.15% of retarder, 0.01-1.5% of water reducing agent, 0.01-7% of quick hardening agent and 5-15% of seawater.
The coral aggregates and the seawater are mainly adopted, local materials are fully used, and the reserve amount of land transportation, rush repair and construction raw materials is greatly reduced; by adopting the coral aggregates with natural gradation and natural moisture content, through a large amount of experimental studies and the gradation theoretical analysis after the fine screening of the coral aggregates, the mixing amount of the cementing material and the coral aggregates is optimized, and the adverse effects of the natural gradation and the grain shape of the coral aggregates on the workability and the mechanical property of the concrete are solved; in order to overcome the defect of high water absorption of the coral aggregate, a new preparation method is provided by actually measuring the natural water content, the water absorption and the water absorption rate of the coral aggregate; the influence of ions in seawater on the mechanical property of the concrete in the super early age is overcome through the types of additives such as an early strength agent, a retarder, a water reducing agent, a thickening agent and the like; the invention breaks through the engineering technical problems that the grading of the coral aggregate is difficult to control, the water content is changed greatly, the internal pore is large, the water absorption is large, and the influence of ions in seawater on the early performance of the concrete is large, and realizes that the coral aggregate concrete can be applied to actual rush repair and rush construction engineering in a large scale; the method covers the common cement types and the emergency repair and construction processes, and can adopt different concrete preparation methods according to different construction processes, thereby effectively solving the problem of dependence on the traditional building materials of the reef emergency repair and construction project.
In a preferred embodiment of the present invention, the cement is any one of magnesium phosphate cement, sulphoaluminate cement, and portland cement. The most suitable type of cement can be selected according to the actual construction type.
In a preferred embodiment of the present invention, the magnesium phosphate cement is any one of magnesium phosphate cements of monoammonium phosphate type, magnesium phosphate cements of monopotassium phosphate type, and magnesium phosphate cements of monosodium phosphate.
As a preferable scheme of the invention, the strength of the sulphoaluminate cement is more than or equal to 42.5 grade; and/or; the strength of the portland cement is greater than or equal to 42.5 grade. The strength levels of different cements have certain influence on the strength of the prepared concrete, and a large number of experiments show that the concrete prepared from the sulphoaluminate cement and the Portland cement with the strength more than or equal to 42.5 levels has the best effect.
As a preferable scheme of the invention, the coral aggregate is a naturally graded coral sand-stone mixture generated in the island reclamation construction process. The coral aggregates exist on the reef in large quantity, can be obtained from local materials and are easy to obtain.
The fly ash used in the invention is I-grade fly ash or II-grade fly ash. Wherein, the concrete prepared from the I-grade fly ash has the best physical property.
According to the preferable scheme of the invention, the diameter of the steel fiber is 0.10-0.60 mm, and the length of the steel fiber is 8-30 mm; and/or; the organic fiber is polyvinyl alcohol fiber or polypropylene fiber, and the length of the organic fiber is 6-20 mm; and/or; the thickener is any one of hydroxyethyl cellulose, methyl hydroxyethyl cellulose, ethyl hydroxyethyl cellulose and methyl hydroxypropyl cellulose. After the fiber is added, the early flexural strength can be effectively improved, and the fiber can be used for engineering parts with higher requirements on the flexural strength, such as pavement engineering.
As a preferred scheme of the invention, the early strength agent comprises the following compound raw materials in percentage by mass: 10-20% of lithium carbonate and 80-90% of calcium nitrite; and/or the retarder is citric acid; and/or the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is not lower than 30%; and/or the hardening accelerator is dodecacalcium heptaluminate. The preferable additive is beneficial to overcoming the influence of ions in seawater on the mechanical property of the concrete in the early stage; the engineering technical problems that the grading of the coral aggregates is difficult to control, the moisture content is changed greatly, the internal pores are large, the water absorption is large, and the influence of ions in seawater on the early performance of the concrete is large are solved.
In order to explain the preparation methods of the seawater coral aggregate concrete for rush-repair and rush-construction projects in different processes, provided by the invention, fig. 1 shows a flow of the preparation method of the seawater coral aggregate concrete for rush-repair and rush-construction projects in a cast-in-place construction process or a prefabrication process according to an embodiment of the invention; fig. 2 shows a flow of the preparation method of the seawater coral aggregate concrete for rush repair and rush construction in the wet spraying construction process according to the embodiment of the invention.
As shown in figure 1, the preparation method of the seawater coral aggregate concrete for rush-repair and rush-construction engineering provided by the invention is applied to a cast-in-place construction process or a prefabrication process of the seawater coral aggregate concrete for rush-repair and rush-construction engineering, and comprises the following steps:
s110, weighing the raw materials according to the mass percentage;
s120, dividing the seawater in the raw materials into two parts, namely a first part of seawater and a second part of seawater;
s130, adding coral aggregates in the raw materials and a first part of seawater into a stirrer, and stirring for 2min to obtain a first-stage mixed material; wherein the mass of the first part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not larger than 30 mm;
S140, adding other raw materials except the second part of seawater and the water reducing agent in the raw materials into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
s150, adding a mixed solution of a second part of seawater and a water reducing agent into the second-stage mixed material, and stirring for 2min to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
As shown in fig. 2, the preparation method of the seawater coral aggregate concrete for rush-repair and rush-construction provided by the invention is applied to a wet injection construction process of the seawater coral aggregate concrete for rush-repair and rush-construction, and comprises the following steps:
s210, weighing the raw materials according to the mass percentage;
s220, dividing the seawater in the raw materials into three parts, namely a first part of seawater, a second part of seawater and a third part of seawater, wherein the first part of seawater is equivalently mixed with the sum of the early strength agent and the quick hardening agent in the raw materials to serve as an accelerator;
s230, adding the coral aggregates in the raw materials and the second part of seawater into a stirrer, and stirring for 2min to obtain a first-stage mixed material; the second part of seawater accounts for 10-15% of the coral aggregate by mass, and the particle size of the coral aggregate is not more than 15 mm;
S240, adding other raw materials except the accelerator, the third part of seawater and the water reducer into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
s250, adding a mixed solution of the water reducing agent and the third part of seawater into the second-stage mixed material, and stirring for 2min +/-1 min to obtain a third-stage mixed material;
and S260, mixing the accelerator with the third-stage mixed material at a nozzle of a spraying machine, and spraying to obtain the seawater coral aggregate concrete for rush repair and rush construction engineering.
In a preferred embodiment of the present invention, the cement in the raw material is sulphoaluminate cement or portland cement.
The invention is further described by the following specific examples.
In the following examples, the raw materials for preparing the seawater coral aggregate concrete for rush repair and rush construction project are as follows: monopotassium phosphate magnesium cement, 42.5-grade sulphoaluminate cement, 42.5-grade portland cement, I-grade fly ash, steel fibers with the diameter of 0.20mm and the length of 15mm, polyvinyl alcohol fibers (one of organic fibers) with the length of 12mm, and a coral sand-stone mixture (coral aggregate) with natural gradation on a certain island in south China sea, wherein when the concrete construction process is a spraying process, the particle size is 0-15 mm; when the concrete construction process is a cast-in-place or prefabrication process, the early strength agent, the dodecacalcium heptaluminate (quick hardening agent), the citric acid (retarder), the polycarboxylic acid water reducing agent (water reducing agent) with the water reducing rate of 32%, the methylhydroxypropylcellulose (thickening agent) and seawater near a certain island in the south China sea have the particle size of 0-30 mm, and are compounded by 15% of lithium carbonate and 85% of calcium nitrite in percentage by mass.
Example one
The raw material percentage of the seawater coral aggregate concrete for rush repair and rush construction engineering is shown in table 1. Wherein the cement is magnesium phosphate cement.
TABLE 1
The comparative examples in table 1 were prepared using conventional concrete preparation methods;
the seawater coral aggregate concrete formula for rush-repair and rush-construction engineering in each embodiment is prepared by adopting the following method, and comprises the following steps:
weighing the raw materials according to the mass percentage;
dividing the seawater in the raw materials into two parts, namely a first part of seawater and a second part of seawater;
adding coral aggregates and a first part of seawater in the raw materials into a stirrer, and stirring for 2min to obtain a first-stage mixed material; wherein the mass of the first part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not larger than 30 mm;
adding other raw materials except the second part of seawater and the water reducer in the raw materials into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
and adding a mixed solution of a second part of seawater and a water reducing agent into the second-stage mixed material, and stirring for 2min to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
The obtained seawater coral aggregate concrete for rush repair and rush construction is applied to a cast-in-place construction process.
The detection results of the mechanical properties of the seawater coral aggregate concrete for rush-repair and rush-construction engineering prepared by the method are shown in table 2.
| Serial number | 1h flexural strength | Compressive strength of 1 hour | Compressive strength of 3h | 1d compressive strength | 28 compressive strength |
| Comparative example | 1.8 | 18.6 | 23.9 | 27.8 | 44.1 |
| 1 | 2.4 | 20.5 | 25.4 | 31.7 | 46.9 |
| 2 | 2.6 | 23.1 | 25.3 | 32.4 | 50.1 |
| 3 | 3.1 | 29.6 | 29.8 | 39.3 | 54.2 |
| 4 | 3.3 | 32.4 | 31.6 | 37.9 | 50.5 |
| 5 | 3.1 | 30.5 | 30.7 | 35.2 | 47.8 |
TABLE 2
As is apparent from Table 2, the seawater coral aggregate concrete for rush repair and rush construction engineering and the preparation method thereof provided by the invention have the advantages that various mechanical properties of the prepared concrete are superior to those of a comparative example in a cast-in-place construction process.
Example two
The percentage of the raw materials of the seawater coral aggregate concrete for rush repair and rush construction engineering is shown in table 3, wherein the cement is sulphoaluminate cement.
TABLE 3
The seawater coral aggregate concrete formulations for rush-repair and rush-construction projects in the comparative example and the example 1 in table 3 are prepared by the following method, including the following steps:
weighing the raw materials according to the mass percentage;
dividing the seawater in the raw material into three parts, namely a first part of seawater, a second part of seawater and a third part of seawater, wherein the first part of seawater is equivalently mixed with the sum of the early strength agent and the quick hardening agent in the raw material to be used as an accelerator;
adding coral aggregates and a second part of seawater in the raw materials into a stirrer, and stirring for 2min to obtain a first-stage mixed material; the second part of seawater accounts for 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not more than 15 mm;
Adding other raw materials except the accelerator, the third part of seawater and the water reducer into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
adding a mixed solution of a water reducing agent and the third part of seawater into the second-stage mixed material, and stirring for 2min to obtain a third-stage mixed material;
and mixing the accelerator with the third-stage mixed material at the nozzle of the spraying machine and then spraying to obtain the seawater coral aggregate concrete for rush-repair and rush-construction projects.
The obtained seawater coral aggregate concrete for rush repair and rush construction is applied to a wet spraying construction process.
In the embodiment No. 2-4 in the table 3, the seawater coral aggregate concrete formulations for rush-repair and rush-construction engineering are prepared by the following method, including the following steps:
weighing the raw materials according to the mass percentage;
dividing the seawater in the raw materials into two parts, namely a first part of seawater and a second part of seawater;
adding coral aggregates and a first part of seawater in the raw materials into a stirrer, and stirring for 2min to obtain a first-stage mixed material; wherein the mass of the first part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not larger than 30 mm;
adding other raw materials except the second part of seawater and the water reducer in the raw materials into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
And adding a mixed solution of a second part of seawater and a water reducing agent into the second-stage mixed material, and stirring for 2min to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
The obtained seawater coral aggregate concrete for rush repair and rush construction is applied to a cast-in-place construction process.
The detection results of the mechanical properties of the seawater coral aggregate concrete for rush-repair and rush-construction engineering prepared by the method are shown in table 4.
| Serial number | 1h flexural strength | Compressive strength of 1 hour | Compressive strength of 3h | 1d compressive strength | 28 compressive strength |
| Comparative example | 2.2 | 28.3 | 30.2 | 35.3 | 47.2 |
| 1 | 4.3 | 29.3 | 32.9 | 39.5 | 49.1 |
| 2 | 3.3 | 26.7 | 28.2 | 43.2 | 55.3 |
| 3 | 2.8 | 26.8 | 29.6 | 35.6 | 45.2 |
| 4 | 4.5 | 32.7 | 35.1 | 44.3 | 54.2 |
TABLE 4
EXAMPLE III
The percentage of the raw materials of the seawater coral aggregate concrete for rush repair and rush construction engineering is shown in table 5, wherein the cement is portland cement.
TABLE 5
The concrete of comparative example, example No. 1 and example No. 2 in table 5 was applied to a spray construction process, and its preparation method included the following steps:
weighing the raw materials according to the mass percentage;
dividing the seawater in the raw material into three parts, namely a first part of seawater, a second part of seawater and a third part of seawater, wherein the first part of seawater is equivalently mixed with the sum of the early strength agent and the quick hardening agent in the raw material to be used as an accelerator;
adding coral aggregates and a second part of seawater in the raw materials into a stirrer, and stirring for 2min to obtain a first-stage mixed material; wherein the mass of the second part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not more than 15 mm;
Adding other raw materials except the accelerator, the third part of seawater and the water reducer into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
adding a mixed solution of a water reducing agent and a third part of seawater into the second-stage mixed material, and stirring for 2min to obtain a third-stage mixed material;
and mixing the accelerator with the third-stage mixed material at the nozzle of the spraying machine and then spraying to obtain the seawater coral aggregate concrete for rush-repair and rush-construction projects.
The concrete of example 3 and example 4 in table 5 is applied to a cast-in-place or prefabrication construction process, and the preparation method comprises the following steps:
weighing the raw materials according to the mass percentage;
dividing the seawater in the raw materials into two parts, namely a first part of seawater and a second part of seawater;
adding coral aggregates and a first part of seawater in the raw materials into a stirrer, and stirring for 2min to obtain a first-stage mixed material; wherein the mass of the first part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not larger than 30 mm;
adding other raw materials except the second part of seawater and the water reducer in the raw materials into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
and adding a mixed solution of a second part of seawater and a water reducing agent into the second-stage mixed material, and stirring for 2min to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
The mechanical property detection results of the seawater coral aggregate concrete for rush-repair and rush-construction engineering prepared by the method are shown in table 6.
| Serial number | 1h flexural strength | Compressive strength of 1 hour | Compressive strength of 3h | 1d compressive strength | 28 compressive strength |
| Comparative example | 1.8 | 23.7 | 26.4 | 31.1 | 47.3 |
| 1 | 2.9 | 24.9 | 28.2 | 32.4 | 49.9 |
| 2 | 3.1 | 29.7 | 32.4 | 38.5 | 56.8 |
| 3 | 2.4 | 23.6 | 28.8 | 33.4 | 50.2 |
| 4 | 3.0 | 27.3 | 31.7 | 37.9 | 57.1 |
TABLE 6
By combining the embodiments, the seawater coral aggregate concrete for rush-repair and rush-construction engineering and the preparation method thereof provided by the invention can be found that the strength of each mixing proportion of 28d meets the requirement of C40, and the engineering requirements including airport pavements are met. The test result also shows that the fiber can effectively improve the early flexural strength after being doped, and can be used for engineering parts with higher requirements on the flexural strength, such as pavement engineering.
The seawater coral aggregate concrete for rush-repair and rush-construction work and the preparation method thereof proposed according to the present invention are described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications can be made to the seawater coral aggregate concrete for emergency repair and emergency construction and the preparation method thereof, which are proposed by the present invention, without departing from the contents of the present invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (10)
1. The seawater coral aggregate concrete for rush repair and rush construction engineering is characterized by comprising the following raw materials in percentage by mass:
15-40% of cement, 0-5% of borax, 0-10% of fly ash, 35-70% of coral aggregate, 0.1-4% of steel fiber, 0.01-0.5% of organic fiber, 0.01-0.10% of thickening agent, 0.01-0.3% of early strength agent, 0.01-0.15% of retarder, 0.01-1.5% of water reducing agent, 0.01-7% of quick hardening agent and 5-15% of seawater;
wherein the diameter of the steel fiber is 0.10-0.60 mm, and the length is 8-30 mm.
2. The seawater coral aggregate concrete for rush-repair and rush-construction projects according to claim 1, wherein the cement is any one of magnesium phosphate cement, sulphoaluminate cement and portland cement.
3. The seawater coral aggregate concrete for rush-repair rush-construction projects according to claim 2, wherein the magnesium phosphate cement is any one of magnesium phosphate cement of ammonium dihydrogen phosphate type, magnesium phosphate cement of potassium dihydrogen phosphate type and magnesium phosphate cement of sodium dihydrogen phosphate type.
4. The seawater coral aggregate concrete for rush-repair and rush-construction projects according to claim 2, wherein the strength of the sulphoaluminate cement is greater than or equal to 42.5 grade; and/or;
The strength of the portland cement is greater than or equal to 42.5 grade.
5. The seawater coral aggregate concrete for rush-repair and rush-construction projects according to claim 1, wherein the coral aggregate is a mixture of naturally graded coral sand and stone produced during the island reclamation blow-fill construction.
6. The seawater coral aggregate concrete for rush-repair and rush-construction projects according to claim 1, wherein,
the organic fiber is polyvinyl alcohol fiber or polypropylene fiber, and the length of the organic fiber is 6-20 mm; and/or;
the thickener is any one of hydroxyethyl cellulose, methyl hydroxyethyl cellulose, ethyl hydroxyethyl cellulose and methyl hydroxypropyl cellulose.
7. The seawater coral aggregate concrete for rush-repair and rush-construction engineering according to claim 1, wherein the early strength agent comprises the following compounded raw materials in percentage by mass:
10-20% of lithium carbonate and 80-90% of calcium nitrite; and/or the presence of a gas in the gas,
the retarder is citric acid; and/or the presence of a gas in the gas,
the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is not lower than 30%; and/or the presence of a gas in the gas,
the quick hardening agent is dodecacalcium heptaluminate.
8. The preparation method of the seawater coral aggregate concrete for the rush-repair rush-construction project according to any one of claims 1 to 7, which is applied to a cast-in-place construction process or a prefabrication process of the seawater coral aggregate concrete for the rush-repair rush-construction project, and comprises the following steps:
Weighing the raw materials according to the mass percentage;
dividing the seawater in the raw materials into two parts, namely a first part of seawater and a second part of seawater;
adding the coral aggregates in the raw materials and the first part of seawater into a stirrer, and stirring for 2min to obtain a first-stage mixed material; wherein the mass of the first part of seawater is 10-15% of the mass of the coral aggregate, and the particle size of the coral aggregate is not larger than 30 mm;
adding other raw materials except the second part of seawater and the water reducer in the raw materials into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
and adding a mixed solution of the second part of seawater and the water reducing agent into the second-stage mixed material, and stirring for 2min to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
9. The preparation method of the seawater coral aggregate concrete for the rush-repair and rush-repair engineering, which is characterized in that the preparation method is applied to the wet spraying construction process of the seawater coral aggregate concrete for the rush-repair and rush-repair engineering, and comprises the following steps:
weighing the raw materials according to the mass percentage;
dividing the seawater in the raw materials into three parts, namely a first part of seawater, a second part of seawater and a third part of seawater, wherein the first part of seawater is equivalently mixed with the sum of the early strength agent and the quick hardening agent in the raw materials to serve as an accelerator;
Adding the coral aggregates in the raw materials and the second part of seawater into a stirrer, and stirring for 2min to obtain a first-stage mixed material; the second part of seawater accounts for 10-15% of the coral aggregate by mass, and the particle size of the coral aggregate is not more than 15 mm;
adding other raw materials except the accelerator, the third part of seawater and the water reducer into the first-stage mixed material, and stirring for 1min to obtain a second-stage mixed material;
adding a mixed solution of the water reducing agent and the third part of seawater into the second-stage mixed material, and stirring for 2min to obtain a third-stage mixed material;
and mixing the accelerator with the third-stage mixed material at a nozzle of a spraying machine and spraying to obtain the seawater coral aggregate concrete for rush-repair and rush-construction engineering.
10. The method for preparing seawater coral aggregate concrete for rush-repair and rush-construction projects according to claim 9, wherein the cement in the raw materials is sulphoaluminate cement or portland cement.
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