CN115353313A - Preparation method of pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete - Google Patents
Preparation method of pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- C04B14/28—Carbonates of calcium
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B28/04—Portland cements
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- 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
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Abstract
The invention discloses a preparation method of pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete, and belongs to the technical field of building material application and concrete. Comprises the following steps: taking a proper amount of coral aggregates for pre-wetting; dividing the pretreated aggregate into two parts, and respectively using a reinforcing material A and a reinforcing aggregate B to reinforce the two parts of the aggregate; the seawater sea sand coral aggregate concrete is prepared by taking reinforced coral aggregates, seawater, sea sand and cement as raw materials. According to the invention, a strengthening method of hole plugging and shell building is adopted to fill the pores of the coral aggregates and form a compact coating layer outside the aggregates, so that the effects of reducing the overall porosity of the coral aggregate concrete and optimizing the interface transition region between the aggregates and the cementing material are achieved, in addition, the transverse deformation of the concrete is effectively improved, the ductility of the concrete is increased, the compressive strength, the axial compressive strength and the splitting tensile strength of the concrete are improved, and the engineering applicability of the coral aggregate concrete in the construction of ocean islands and seas is improved.
Description
Technical Field
The invention belongs to the technical field of building material application and concrete, and particularly relates to a preparation method of pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete.
Background
On the island which is far away from land, the concrete is short of fresh water, sand and stone, long-distance transportation is carried out from land exploitation, the transportation cost is high, and the construction period is prolonged, so that the raw materials around the island engineering are fully utilized to carry out project construction, the restriction of long-distance marine transportation conditions can be eliminated, the engineering cost can be greatly saved, and the construction period can be shortened.
The reserves of the corals in the marine resources are rich, but the corals have more pores and lighter weight, and compared with the traditional crushed stone aggregate, the corals are easy to break, low in cylinder pressure strength, high in porosity and water absorption and poor in physical properties. Therefore, the coral concrete prepared by using the coral as the coarse aggregate has lower strength, brittle texture, poor ductility, easy brittle failure and poor comprehensive performance compared with the common concrete, which hinders the application of the coral aggregate concrete in the actual engineering to a certain extent.
At present, in order to improve the characteristics of brittle texture and poor ductility of coral concrete, mineral admixtures, fibers with toughness, additives and the like are mainly added into the concrete to improve the mechanical property of the coral concrete, and at the moment, the concrete becomes a hard material with strong cementing material and weak internal aggregate. When the coral skeleton is subjected to external load, the light and brittle coral skeleton becomes a weak link when the concrete is damaged, and the mechanical property of the concrete is seriously influenced. The method for strengthening and toughening the coral aggregates is a key point for improving the performance of the coral aggregates, improving the strength of the coral aggregates concrete and increasing the ductility and toughness of the concrete. Therefore, under the funding of natural science foundation (51978389) in Shandong province, the invention provides the pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete.
Disclosure of Invention
The invention provides a preparation method of pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete in view of the problems of the background, and aims to improve the performance of the coral aggregate, and the strength, the ductility and the toughness of the coral aggregate concrete for resisting and adapting to deformation.
The invention relates to a preparation method of pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete, which mainly comprises the following steps:
(1) Preparing coral aggregates, river sand, sea sand, cement, a water reducing agent, culture water and a mold;
(2) Taking a proper amount of coral aggregates for pretreatment at room temperature of 20 +/-2 ℃, putting the coral aggregates into water for soaking and pre-sucking for 1 hour, and then fishing out and draining;
(3) The pre-treated aggregate is divided into two parts: placing a part of coral aggregates in a horizontal mixer, adding a reinforcing material A prepared according to a preset mortar ratio into the mixer according to a small amount of multiple methods, and designing the mass ratio of the mortar to the aggregates to be 1: 0.4-1.3, according to the mass ratio of the slurry to the aggregate, the stirring time is designed to be 2-5 minutes, after the prefabricated reinforcement material A is completely added, the aggregate is kept to be soaked in abundant slurry for 1 minute so as to ensure that the slurry tightly wraps the aggregate and does not generate segregation and other phenomena, after the stirring is finished, in order to ensure that the thickness of an aggregate wrapping layer is uniform, the wrapped aggregate is taken out and placed into a vibrating screen, and redundant slurry on the surface of the aggregate is removed by utilizing a vibrating slurry removing principle; putting the other part of the aggregate into a strengthening material B prepared according to a preset glue-bone ratio for strengthening treatment;
(4) Spreading the treated aggregate in a vibration disc, and regularly turning the aggregate for 1 to 3 hours at normal room temperature by using the working principle of rotary shaking of the vibration disc so as to prevent the aggregate from being adhered; then, in order to ensure the setting of the aggregates and promote the strength development of the coating layer, an organic non-viscous concrete curing film is adopted for covering, after 24 hours, the organic non-viscous concrete curing film is changed into a felted film for covering and water spraying curing is started, after 7 days of curing, the reinforcing aggregates are naturally dried, the coating layer is completely hardened, and the required reinforcing coral aggregates can be prepared;
(5) And (3) calculating and adapting the mixing proportion of the concrete, adding additional water according to the water absorption capacity of the coral aggregate within 1 hour, and mixing the reinforced coral aggregate, the cement, the sea sand, the water reducing agent and the mixed culture water to prepare the concrete.
The step (2) of pretreatment is to remove excessive impurities in the coral aggregates without carrying out breakage treatment on the coral aggregates, and the draining standard is that the coral aggregates are in a saturated surface dry state or a state close to the saturated surface dry state, and the coral aggregates reach the saturated surface dry state by adopting a wet pure cotton towel light wiping method.
The strengthening material A in the step (3) is cement mortar mixed by cement, sand and fresh water, the water cement ratio is 0.3-0.5, and the sand cement ratio is designed to be 0.5-1.5.
In the step (3), the strengthening material B is dry cement powder, and the glue-bone ratio is designed to be 0.38-0.65.
And further adding a small amount of cement dry powder into the stirrer for multiple times, and performing dry wrapping reinforcement on the coral aggregates in the saturated surface dry state of each batch, wherein the stirring time of each batch is not less than 30 seconds based on the glue-bone ratio design.
And further repeating the operation steps, and preparing sufficient reinforced coral aggregates for concrete preparation according to the reinforcing method.
In the step (5), the concrete is mixed, the test mould is cleaned firstly, a layer of release agent is brushed on the inner wall of the mould, appliances such as a stirrer to be used are wetted, and the test material is weighed according to the mixing ratio.
And further putting the coarse aggregate, the cement and the fine aggregate into a JQ350 type forced mixer in sequence, pre-mixing the mixture until the mixture is uniform, adding the mixture mixed with the water reducing agent into the mixer by adopting a small amount of method for multiple times, wherein the mixing time is 1 minute each time, continuously mixing the mixture until the concrete is uniform after all the mixture is added, and taking out a proper amount of concrete for slump test.
Further pouring concrete into the prepared die, using a vibrating table for vibration molding, and simultaneously using a spatula to perform auxiliary insertion and tamping around the test die until no laitance or large bubbles overflow from the surface of the test piece, placing the test piece on a flat ground at the moment, performing upper surface floating treatment, and covering the test piece with a plastic film.
And further standing for 24 hours at the room temperature of 20 +/-2 ℃, then removing the die and marking the test piece, and then putting the test piece into water for maintenance, wherein the maintenance water and the mixing water are kept consistent.
The preparation method of the pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete has the following advantages:
(1) The processing cost of the coral aggregate reinforced by the mortar or the cement dry powder is lower and far lower than that of other cementing materials, and the capability of improving the strength of the coral aggregate is stronger without introducing other impurities or harmful components;
(2) After the filling and wrapping, the porosity of the coral aggregate is effectively reduced, the strength is improved, and the ductility of common coral aggregate concrete is improved; meanwhile, chloride ions in the seawater sea sand can promote hydration reaction of cement mortar to generate hydrotalcite-like double metal hydroxides, and the unique layered structure of the double metal hydroxides can effectively improve the original loose structure of an interface transition region between the aggregate and the concrete matrix, increase the occlusion effect of the interface transition region to strengthen the mechanical property of the original interface, and improve the bonding degree between the aggregate and the mortar matrix; under the combined action of the two aspects, the deformation and the cracking of the concrete are effectively restrained, and the toughness and the deformability of the concrete are obviously improved;
(3) Inherits the development concept of green, environmental protection and energy conservation of civil engineering and is used for solving the problems of building material shortage, difficult transportation task and high engineering cost in the island and reef engineering construction process.
Drawings
FIG. 1 is a flow chart of the preparation of reinforced coral aggregates;
FIG. 2 is a microscopic topography of a comparative coral aggregate of the invention;
FIG. 3 is a surface topography map of the reinforced coral aggregate of example 1, step (5) and example 2, step (4) of the present invention;
FIG. 4 is a sectional view of the interior of the reinforced coral aggregate obtained in step (5) of example 1 and step (4) of example 2 according to the present invention;
FIG. 5 is a microscopic morphology of reinforced coral aggregate concrete in step (6) in example 1 and in step (5) in example 2 according to the present invention;
FIG. 6 is a sectional view of the interior of the reinforced coral aggregate concrete obtained in step (6) of example 1 and step (5) of example 2 according to the present invention;
FIG. 7 is a concrete slump for each example and comparative example;
FIG. 8 is a stress-strain curve of coral aggregate concrete of each example and comparative example;
FIG. 9 shows the failure mode of the coral aggregate concrete specimen.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
Example 1
A method for preparing pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete comprises preparing two parts of wrapped slurry reinforced coral aggregate and mixed coral aggregate concrete, wherein the fine aggregate of the concrete is sea sand, and the particle size range is 0.15-4.75 mm; the mixing water is seawater, wherein the content of chloride ions is 19.83g/L; the water reducing agent is a polycarboxylic acid high-performance water reducing agent; seawater is also adopted for later test piece maintenance.
Wherein, the water cement ratio that the parcel thick liquid adopted is 0.4, and the sand-cement ratio is 0.5, and the design of stirring coral aggregate concrete is through water cement ratio 0.305, and design intensity is C30, and concrete benchmark mix proportion is the sea water: cement: sea sand: coral aggregate =157.685:517:992:806.
the concrete preparation method of the seawater sea sand coral aggregate concrete comprises the following steps:
(1) Preparing coral aggregates, river sand, sea sand, cement, a water reducing agent, culture water and a mold;
(2) Taking a proper amount of coral aggregates without damage treatment at the room temperature of 20 +/-2 ℃, removing redundant impurities in the coral aggregates, putting the coral aggregates into water for pre-absorption for 1 hour, then fishing out for draining, and lightly wiping by adopting a wet pure cotton towel to ensure that the coral aggregates reach a saturated surface dry state;
(3) Mixing the wrapping slurry, weighing water, cement and river sand according to a pre-designed sand-to-glue ratio, pouring the water into a container, adding the cement and the river sand while stirring by adopting a vertical stirrer, and continuing stirring for 10 minutes after all the materials are added;
(4) Putting the prepared coral aggregate into a horizontal mixer, adding the uniformly mixed mortar into the mixer by adopting a method of a small amount of times, and designing the mass ratio of the mortar to the aggregate to be 1: 0.4-1.3, according to the mass ratio of the slurry to the aggregate, the stirring time is designed to be 2-5 minutes, after the prefabricated reinforced material A is completely added, the aggregate is kept to be soaked in the abundant slurry for 1 minute so as to ensure that the slurry densely wraps the aggregate and does not generate segregation and other phenomena, after the stirring is finished, in order to ensure that the thickness of an aggregate wrapping layer is uniform, the wrapped aggregate is taken out and placed into a vibrating screen, and redundant slurry on the surface of the aggregate is removed by utilizing a vibrating slurry removing principle;
(5) Spreading the treated aggregate in a vibration disc, and regularly turning the aggregate for 1 to 3 hours at normal room temperature by using the working principle of rotary shaking of the vibration disc so as to prevent the aggregate from being adhered; then, in order to ensure the setting of the aggregate and promote the strength development of the coating layer, covering the coating layer by using an organic non-viscous concrete curing film, after 24 hours, switching the organic non-viscous concrete curing film into a felted wool to cover the coating layer and starting watering curing, and after curing for 7 days, naturally airing the reinforcing aggregate to completely harden the coating layer, thus obtaining the required reinforcing coral aggregate;
(6) Cleaning a test mould, brushing a layer of release agent on the inner wall, wetting appliances such as a stirrer to be used, and weighing a test material according to a mixing ratio; putting the coarse aggregate, the cement and the fine aggregate into a JQ350 type forced mixer in sequence, pre-mixing the mixture until the mixture is uniform, adding the mixture mixed with the water reducing agent into the mixer by adopting a small amount of method for multiple times, wherein the mixing time is 1 minute each time, continuously mixing the mixture until the concrete is uniform after all the mixture is added, taking out a proper amount of concrete, and carrying out slump test, wherein the result is shown in figure 7; pouring concrete into a prepared mould, using a vibrating table to vibrate and form, and simultaneously using a spatula to perform auxiliary insertion and tamping around the test mould until no floating slurry or large bubbles overflow from the surface of the test piece, placing the test piece on a flat ground to perform troweling treatment, then covering the test piece with a plastic film, standing for 24 hours at the room temperature of 20 +/-2 ℃, then removing the mould and marking the test piece, and then placing the test piece into curing water to perform curing.
Example 2
Example 2 differs from example 1 in the reinforcement material and in the reinforcement parameters. The strengthening mode of the embodiment adopts dry coating, and the glue-bone ratio is 0.63.
The concrete preparation method of the seawater sea sand coral aggregate concrete comprises the following steps:
(1) Preparing coral aggregates, river sand, sea sand, cement, a water reducing agent, culture water and a mold;
(2) Taking a proper amount of coral aggregates without carrying out damage treatment at the room temperature of 20 +/-2 ℃, removing redundant impurities in the coral aggregates, putting the coral aggregates into water for pre-absorption for 1 hour, then fishing out for draining, and lightly wiping by adopting a wet pure cotton towel to ensure that the coral aggregates reach a saturated surface dry state;
(3) Preparing aggregates and cement dry powder according to a preset glue-to-bone ratio, putting the prepared coral aggregates into a horizontal stirrer, adding a small amount of cement dry powder into the stirrer for multiple times, carrying out dry wrapping reinforcement on the coral aggregates in a saturated surface dry state of each batch, designing the stirring time of each batch to be not less than 30 seconds based on the glue-to-bone ratio until the cement dry powder is uniformly adhered to the surfaces of the coral aggregates, and taking out the reinforced aggregates;
(4) Spreading the treated aggregate in a vibration disc, and regularly turning over the aggregate for 1-3 hours at normal room temperature by using the working principle of rotary vibration of the vibration disc to prevent the aggregate from being adhered; then, in order to ensure the setting of the aggregate and promote the strength development of the coating layer, covering the coating layer by using an organic non-viscous concrete curing film, after 24 hours, switching the organic non-viscous concrete curing film into a felted wool to cover the coating layer and starting watering curing, and after curing for 7 days, naturally airing the reinforcing aggregate to completely harden the coating layer, thus obtaining the required reinforcing coral aggregate;
(5) Cleaning a test mould, brushing a layer of release agent on the inner wall, wetting appliances such as a stirrer to be used, and weighing a test material according to a mixing ratio; putting the coarse aggregate, the cement and the fine aggregate into a JQ350 type forced mixer in sequence, pre-mixing the mixture uniformly, adding the mixture water mixed with the water reducing agent into the mixer by a small amount of multiple methods, wherein the mixing time is 1 minute each time, continuously mixing the mixture water after all the mixture water is added until the concrete is uniform, taking out a proper amount of concrete, and carrying out slump test, wherein the result is shown in a figure 7; pouring concrete into a prepared mould, using a vibrating table to vibrate and form, and simultaneously using a spatula to perform auxiliary insertion and tamping around a test mould until no laitance and large bubbles overflow from the surface of the test piece, placing the test piece on a flat ground at the moment, performing troweling treatment, then covering the test piece with a plastic film, standing for 24 hours at the room temperature of 20 +/-2 ℃, then removing the mould and marking the test piece, and then placing the test piece into curing water for curing.
Comparative example
The difference from example 1 is that in step (2), concrete was mixed using an unreinforced coral aggregate as a coarse aggregate.
The relevant physical property tests were carried out in accordance with the lightweight aggregate and test method part 2: lightweight aggregate test method (GB/T17431.2-2010) and compared with unreinforced coral aggregates, the results are shown in Table 1.
FIG. 1 is a flow chart of the preparation of reinforced coral aggregates; FIG. 2 is a microscopic topography of a comparative coral aggregate of the present invention; FIG. 3 is a surface topography map of the reinforced coral aggregate of example 1, step (5) and example 2, step (4) of the present invention; FIG. 4 is a sectional view of the interior of the reinforced coral aggregate obtained in step (5) of example 1 and step (4) of example 2 according to the present invention; FIG. 5 is a microscopic morphology of reinforced coral aggregate concrete in step (6) of example 1 and step (5) of example 2 according to the present invention; FIG. 6 is a sectional view of the interior of the reinforced coral aggregate concrete obtained in step (6) of example 1 and step (5) of example 2 according to the present invention; FIG. 7 is slump of coral aggregate concrete of each example and comparative example; FIG. 8 is a stress-strain curve of coral aggregate concrete of each example and comparative example; FIG. 9 shows the failure mode of the coral aggregate concrete specimen.
TABLE 1 physical Properties of reinforced coral aggregates
Compared with the non-reinforced coral aggregate, the water absorption of the reinforced coral aggregate is respectively reduced by 46 percent and 41.1 percent; the porosity is respectively reduced by 23.9 percent and 16.1 percent; the apparent density is respectively improved by 2.6 percent and 1.2 percent; the barrel pressure strength is improved by 125% and 150%. The mortar has good fluidity, is easier to fill in the pores in the aggregate, has sufficient hydration effect, can generate hydration products such as C-S-H gel and the like on the surface and in the aggregate to improve the pore structure and enable the hardened mortar shell to be more compact, and has obvious effect of improving the physical properties of the aggregate; in contrast, the cement dry powder has poor permeability to the aggregate, cement particles which form a gel are not fully hydrated and cannot be converted into stable crystals, the filling effect on internal pores is relatively weakened, but a thicker wrapping layer can be formed on the surface, and the cylinder pressure strength of the coral aggregate is greatly improved.
According to the standard of concrete physical mechanical property test method (GB/T50081-2019), test pieces of 150mm multiplied by 150mm and 100mm multiplied by 300mm are poured to measure the mechanical properties of the concrete such as strength, deformation and the like in 28 days.
TABLE 2 mechanical properties and growth rate of seawater sea sand coral aggregate concrete for 28 days
Note: (1) the ductility coefficient is used for reflecting the ductility change of the reinforced coral aggregate concrete;
(2) toughness is expressed in terms of the ability of concrete to absorb energy during plastic deformation and fracture (strain energy).
Compared with the comparative example, the compressive strength, the axial compressive strength and the splitting tensile strength of the seawater sea sand coral aggregate concrete are averagely improved by 19.05 percent, 21.7 percent and 18.1 percent. The improvement of the self property of the aggregate and the promotion effect of high-content chloride ions on the hydration reaction of cement paste increase the occlusion effect of the interface transition area, improve the microstructure of the concrete and improve the mechanical property of the concrete.
The Poisson ratio of the concrete is reduced by 14.1 percent on average compared with the comparative example, the elastic modulus and the ductility of the concrete are improved by 10.6 percent and 5.4 percent on average compared with the comparative example, and the average strain energy of the concrete is 1.69 times that of the comparative example. As can be seen from fig. 9: only one penetrating macroscopic crack exists when a comparative sample is damaged, other visible macroscopic cracks do not exist, the sample is instantaneously cracked before being damaged, and the sample is obviously brittle failure; in the process of load-bearing damage of the reinforced coral aggregate concrete test piece, a plurality of cracks with the length of about 20 millimeters are formed on the surface, the cracks gradually develop into main penetrating cracks along with the increase of load and fall off along with part of concrete, an obvious sign is given before the damage, and the damage of the test piece is biased to ductile damage.
The hydrotalcite bimetal hydroxide generated by hydration effectively improves the original loose structure of the interface transition zone between the aggregate and the concrete matrix, increases the occlusion effect of the interface transition zone, improves the bonding degree between the aggregate and the mortar matrix, effectively restrains the deformation and the cracking of the concrete, and improves the toughness of the concrete.
The compressive strength, axial compressive strength and elastic modulus of the coral aggregate concrete reinforced by mortar wrapping are slightly higher than those of the coral aggregate concrete reinforced by dry cement powder, but the concrete prepared by mixing the two reinforced aggregates has better strength, ductility and toughness than those of common coral aggregate concrete, and the materials are simply prepared and the operation is easy to operate when the cement dry powder is only used for wrapping and reinforcing.
The present embodiments have been disclosed above, but are not limited to the applications listed in the description and the embodiments, and can be fully applied to various fields suitable for the present invention.
Claims (5)
1. A preparation method of pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete is characterized by comprising the following steps:
(1) Preparing coral aggregates, river sand, sea sand, cement, a water reducing agent, culture water and a mold;
(2) Taking a proper amount of coral aggregates for pretreatment at the room temperature of 20 +/-2 ℃, putting the coral aggregates into water for soaking for 1 hour, and then fishing out and draining;
(3) The pre-treated aggregate is divided into two parts: placing a part of coral aggregates into a horizontal stirrer, adding a reinforcing material A prepared according to a predetermined mortar ratio into the stirrer according to a small amount of multiple methods, and designing the mass ratio of the mortar to the aggregates to be 1:0.4 to 1.3, designing the stirring time to be 2 to 5 minutes according to the mass ratio of the slurry to the aggregate, after the prefabricated reinforcement material A is completely added, keeping the aggregate to be soaked in the abundant slurry for 1 minute to ensure that the slurry compactly wraps the aggregate and does not generate segregation and other phenomena, taking out the wrapped aggregate to be placed in a vibrating screen after stirring is finished, and removing the redundant slurry on the surface of the aggregate by utilizing a vibration slurry removing principle; putting the other part of the aggregate into a strengthening material B prepared according to a preset glue-bone ratio for strengthening treatment;
(4) Spreading the treated aggregate in a vibration disc, and regularly turning the aggregate for 1 to 3 hours at normal room temperature by using the working principle of rotary shaking of the vibration disc so as to prevent the aggregate from being adhered; then, in order to ensure the setting of the aggregate and promote the strength development of the coating layer, covering the coating layer by using an organic non-viscous concrete curing film, after 24 hours, switching the organic non-viscous concrete curing film into a felted wool to cover the coating layer and starting watering curing, and after curing for 7 days, naturally airing the reinforcing aggregate to completely harden the coating layer, thus obtaining the required reinforcing coral aggregate;
(5) And (3) calculating and adapting the mixing proportion of the concrete, adding additional water according to the water absorption capacity of the coral aggregate within 1 hour, and mixing the reinforced coral aggregate, the cement, the sea sand, the water reducing agent and the mixed culture water to prepare the concrete.
2. The method as claimed in claim 1, wherein the step (2) of pre-coating the coral aggregates is carried out without breaking the coral aggregates but removing excessive impurities from the coral aggregates, the coral aggregates are in a saturated face-dry state or a state close to the saturated face-dry state, and the coral aggregates are in the saturated face-dry state by means of a wet, pure cotton towel.
3. The method for preparing the concrete wrapped with the toughened coral aggregate and the seawater sea sand coral aggregate according to claim 1, wherein the reinforcing material A in the step (3) is cement mortar mixed with cement, sand and fresh water, the water cement ratio is 0.3 to 0.5, and the design range of the sand cement ratio is 0.5 to 1.5.
4. The preparation method of the concrete wrapped with the toughened coral aggregate and the seawater sea sand coral aggregate in the step (3), as claimed in claim 1, wherein the reinforcing material B is cement dry powder, and the designed range of the glue-to-bone ratio is 0.38 to 0.65.
5. The method for preparing the pre-wrapped toughened coral aggregate and seawater sea sand coral aggregate concrete as claimed in claim 1, wherein in said step (3) the cement dry powder is added to the mixer a small amount of times, and the coral aggregate in a saturated face dry state of each batch is dry-wrapped and strengthened, and the mixing time per batch is not less than 30 seconds based on the glue-to-bone ratio design.
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