Coral sand composite material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coral sand materials, and particularly relates to a coral sand composite material and a preparation method and application thereof. The coral sand composite material is prepared from the following raw material components: hydrophilic nano silicon dioxide, cement, coral sand, basalt fiber and water. The hydrophilic nano silicon dioxide, the cement and the basaltic fiber have a synergistic effect, the coral sand composite material has good strength under the combined action of the hydrophilic nano silicon dioxide, the cement and the basaltic fiber, the peak strength in a drainage shear triaxial test can reach 857 kPa, and the residual strength can reach 519 kPa; meanwhile, through the synergistic effect of the three components, the consumption of the cement clinker can be reduced, the energy consumption is effectively reduced, and the adverse effect on the environment in the cement production process is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coral sand materials, and particularly relates to a coral sand composite material and a preparation method and application thereof. BACKGROUND

[0002] Most of the marine construction projects are located in the areas where coral reefs are widely distributed, and coral sand is the most common building material in marine construction. Since the calcium content of coral sand generally reaches more than 90%, the coral sand has the characteristics of easy breakage, irregular particle shape, high specific gravity and many pores, and the engineering properties thereof are high compressibility and easy breakage. Therefore, when the coral sand is used as a building material for infrastructure, it is easy to be eroded by rain and sea waves, resulting in low bearing capacity of the foundation, large looseness, and further leading to uneven settlement of the foundation and other safety problems, which seriously affect the use of the infrastructure.

[0003] As the most typical reinforcing cementitious material, Portland cement is widely used in sand reinforcement. However, the increase of cement dosage will consume a large amount of energy and resources, and the production process will emit carbon dioxide greenhouse gas, which has a negative impact on the environment.

[0004] At present, there is no uniform standard for the treatment of coral sand foundation, and researchers have explored different reinforcement methods. Some studies have disclosed the use of microbial reinforcement to improve the mechanical properties of coral sand foundation by using microbial-induced calcium carbonate precipitation. However, it has environmental sensitivity and technical complexity, and is difficult to popularize and apply. Some studies use high polymer to form a foamed body by volume expansion of the slurry material, and then fill the pores and cement the particles, which can improve the strength and stiffness of the coral sand foundation. However, the high polymer reacts too quickly, which is not conducive to controlling the uniformity of the sample.

[0005] Therefore, it is of great significance to provide a coral sand composite material with less cement dosage and high strength. SUMMARY

[0006] The present application aims to solve one or more technical problems in the prior art, and at least provide a beneficial alternative or create conditions. Specifically, the present application provides a coral sand composite material with less cement dosage and high strength.

[0007] The raw material components of the coral sand composite material of the present application include hydrophilic nano-silica, cement, coral sand, basalt fiber and water. The hydrophilic nano-silica can fill the pores of the coral sand, improve the strength of the coral sand, ensure the cement strength and rigidity without affecting the cement dosage, accelerate the hydration reaction of the cement, shorten the initial and final setting time of the cement, fill the pores, optimize the microstructure and improve the flexural strength of the cemented sand. The basalt fiber has high tensile strength, high elastic modulus and good chemical resistance, which can enhance the compressive strength and tensile strength of the cement-based material and improve the overall structural performance. The synergistic effect of the hydrophilic nano-silica, cement and fiber can improve the strength of the coral sand composite material, and the synergistic effect can also reduce the dosage of cement clinker and effectively reduce the energy consumption.

[0008] Therefore, the first aspect of the present application provides a coral sand composite material.

[0009] Specifically, the raw material components of the coral sand composite material include hydrophilic nano-silica, cement, coral sand, basalt fiber and water.

[0010] Preferably, the cement includes Portland cement.

[0011] Preferably, the dosage of the cement is 2.0-4.5% of the weight of the coral sand; further preferably, the dosage of the cement is 2.2-4.4% of the weight of the coral sand.

[0012] Preferably, the particle size of the coral sand is 0.075-2.00mm.

[0013] Preferably, the porosity ratio of the coral sand is 0.85-1.47; further preferably, the porosity ratio of the coral sand is 0.94-1.43.

[0014] Preferably, the specific gravity of the coral sand is 2.5-3.0 tons / cubic meter; further preferably, the specific gravity of the coral sand is 2.75-2.78 tons / cubic meter.

[0015] Preferably, the hydrophilic nano-silica is a coupling agent modified nano-silica.

[0016] Preferably, the coupling agent includes a silane coupling agent.

[0017] Preferably, the particle size of the hydrophilic nano-silica is 16-25nm; further preferably, the particle size of the hydrophilic nano-silica is 18-22nm; more preferably, the particle size of the hydrophilic nano-silica is 20nm.

[0018] Preferably, the specific surface area of the hydrophilic nanosilica is 175-195 m 2 / g; further preferably, the specific surface area of the hydrophilic nanosilica is 180-190 m 2 / g; further preferably, the specific surface area of the hydrophilic nanosilica is 185 m 2 / g.

[0019] Preferably, the basalt fiber has a diameter of 15-20 μm.

[0020] Preferably, the basalt fiber has a length of 3-6 mm.

[0021] Preferably, the raw material components of the coral sand composite material include, by weight fraction, 2.7-11 parts of hydrophilic nanosilica, 20-38 parts of cement, 920-970 parts of coral sand, 2.7-11 parts of basalt fiber, and 180-220 parts of water.

[0022] Further preferably, the raw material components of the coral sand composite material include, by weight fraction, 3-10 parts of hydrophilic nanosilica, 21-35 parts of cement, 930-970 parts of coral sand, 3-10 parts of basalt fiber, and 190-210 parts of water.

[0023] More preferably, the raw material components of the coral sand composite material include, by weight fraction, 10 parts of hydrophilic nanosilica, 30-35 parts of cement, 950 parts of coral sand, 5-10 parts of basalt fiber, and 200 parts of water.

[0024] The second aspect of the present application provides a method for preparing the coral sand composite material of the first aspect of the present application.

[0025] Specifically, the method for preparing the coral sand composite material includes the following steps:

[0026] Mixing the raw material components to obtain a coagulant, then pouring, curing, and obtaining the coral sand composite material.

[0027] Preferably, the method for preparing the coagulant includes the following steps:

[0028] Mixing the hydrophilic nanosilica and water to obtain a silica mixture;

[0029] Mixing the cement, coral sand, and basalt fiber to obtain a mixture;

[0030] Mixing the mixture and the silica mixture to obtain the coagulant.

[0031] Specifically, the hydrophilic nano-silica is directly stirred with the mixture to form a dry mixture, and then water is added, the nano-silica is easy to gather into a group in the water, and the mechanical properties of the coral sand composite material are reduced. The hydrophilic nano-silica is mixed with water to obtain a silica mixture, and then mixed with other raw materials, so that the nano-silica particles are fully dispersed, and the coral sand composite material with high mechanical strength can be prepared.

[0032] Preferably, the pouring process comprises: filling the concrete into the mold by using a layered compaction method.

[0033] Preferably, the curing time is 4.5-11 days; further preferably, the curing time is 5-10 days.

[0034] The third aspect of the present application provides a coral sand foundation.

[0035] Specifically, the coral sand foundation comprises the coral sand composite material of the first aspect of the present application.

[0036] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0037] (1) The raw material components of the coral sand composite material of the present application include hydrophilic nano-silica, cement, coral sand, basalt fiber and water. The hydrophilic nano-silica can fill the pores of the coral sand, reinforce the strength of the coral sand, reduce the amount of cement while ensuring that the necessary performance of the cement is not affected, and on the other hand, can improve the activity of the cement, accelerate the hydration reaction of the cement, shorten the initial setting and final setting time of the cement, and improve the flexural strength of the cemented sand. Basalt fiber has high tensile strength, high elastic modulus and good chemical resistance, which can enhance the compressive strength and tensile strength of the cement-based material and improve its overall structural performance. The synergistic effect of hydrophilic nano-silica, cement and fiber can make the coral sand composite material have good strength, and the peak strength in the triaxial consolidation drainage shear test can reach 857kPa, and the residual strength can reach 519kPa; at the same time, the synergistic effect of the three can also reduce the amount of cement clinker, effectively reducing energy consumption.

[0038] (2) The preparation process of the present application is simple and convenient for large-scale production and application. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The preparation process flow chart of the coral sand composite material of Example 1 of the present application is shown in the figure;

[0040] Figure 2 The drainage shear curve graph of the coral sand composite material of Example 3 and Comparative Examples 1-6 of the present application is shown in the figure;

[0041] Figure 3 The drainage shear curve diagram of the coral sand composite material of the embodiment 1-4 of the present application. DETAILED DESCRIPTION

[0042] In order to make the skilled in the art more clearly understand the technical solutions described in the present application, the following examples are listed for illustration. It should be pointed out that the following examples do not constitute a limitation on the scope of protection required by the present application.

[0043] The raw materials, reagents or devices used in the following examples, unless otherwise specified, can be obtained from conventional commercial channels, or can be obtained by existing known methods.

[0044] The information of the related raw materials used in the embodiments and comparative examples of the present application is as follows:

[0045] The hydrophilic type nano-silica is gamma-aminopropyl triethoxysilane (KH550 silane coupling agent) modified nano-silica, which is purchased from Hebei Wei Yao New Material Co., Ltd., ZY-SiO2-n020.

[0046] The particle size of the hydrophilic type nano-silica is 20 nm, and the specific surface area is 185 m 2 / g.

[0047] The basalt fiber is a common basalt fiber.

[0048] The Portland cement is PO42.5 ordinary Portland cement, and the initial setting time of the Portland cement is 172 h, and the final setting time is 234 h.

[0049] The coral sand is South China coral sand; the coral sand is subjected to drying treatment, after the drying is completed, the coral sand is taken out and cooled to normal temperature, the dried coral sand is placed in a vibrating screen machine for screening, the coral sand particles with a particle size greater than 2 mm are removed, the void ratio of the coral sand changes in the range of 0.85-1.47, and the specific gravity of the coral sand is 2.76.

[0050] The oleophilic type nano-silica is obtained by modifying nano-silica with KH570 silane coupling agent, which is purchased from Hebei Wei Yao New Material Co., Ltd., ZY-SiO2-n0201.

[0051] The particle size of the oleophilic type nano-silica is 20 nm, and the specific surface area is 170 m 2 / g.

[0052] Embodiment 1

[0053] A kind of coral sand composite material, by weight fraction, its raw material component is composed of 3 parts of hydrophilic type nano-silica, 3 parts of basalt fiber, 24 parts of Portland cement, 970 parts of coral sand, 200 parts of water.

[0054] A preparation method of a coral sand composite material, comprising the following steps:

[0055] (1) hydrophilic nano-silica is added to water, and stirred sufficiently to obtain a uniformly dispersed nano-silica suspension; basalt fiber, Portland cement and coral sand are uniformly dispersed and mixed;

[0056] (2) the nano-silica suspension is added to the mixture, and stirred sufficiently, then the sample is divided into four layers, and each layer is compacted and scraped to form a sample, which is then placed in a mold and cured for seven days to obtain the coral sand composite material, wherein the dry density of the coral sand composite material is 1.39 g / cm 3 , and the size of the cylindrical sample is 50 mm in diameter and 100 mm in height.

[0057] The preparation process flow chart of the coral sand composite material in Example 1 is shown in Figure 1 .

[0058] Example 2

[0059] A coral sand composite material, wherein the raw material components are composed of 6 parts of hydrophilic nano-silica, 3 parts of basalt fiber, 21 parts of Portland cement, 970 parts of coral sand and 200 parts of water.

[0060] The preparation method of the coral sand composite material in Example 2 is the same as that in Example 1.

[0061] Example 3

[0062] A coral sand composite material, wherein the raw material components are composed of 10 parts of hydrophilic nano-silica, 5 parts of basalt fiber, 35 parts of Portland cement, 950 parts of coral sand and 200 parts of water.

[0063] The preparation method of the coral sand composite material in Example 3 is the same as that in Example 1.

[0064] Example 4

[0065] A coral sand composite material, wherein the raw material components are composed of 10 parts of hydrophilic nano-silica, 10 parts of basalt fiber, 30 parts of Portland cement, 950 parts of coral sand and 200 parts of water.

[0066] The preparation method of the coral sand composite material in Example 4 is the same as that in Example 1.

[0067] Comparative Example 1

[0068] Comparative Example 1 provides a coral sand composite material in which 20% hydrophilic nano-silica is used to reinforce 5% cement and coral sand, and the raw materials used are composed of 10 parts of hydrophilic nano-silica, 40 parts of Portland cement, 950 parts of coral sand and 200 parts of water.

[0069] Specifically, 5% represents the mass ratio of cement replacing coral sand, and 20% represents the mass ratio of nano-silica replacing Portland cement. For example, if the original coral sand is 1000g, the replaced coral sand is 1000*0.95=950g, the replaced Portland cement is 1000*5%*80%=40g, and the replaced nano-silica is 1000*5%*20%=10g.

[0070] That is, the difference between Comparative Example 1 and Example 3 is that Comparative Example 1 uses an equal amount of Portland cement to replace basalt fiber, and the others are the same as Example 3.

[0071] Comparative Example 2

[0072] Comparative Example 2 provides a coral sand composite material of 10% basalt fiber and 5% cement reinforced coral sand. The raw materials used are as follows: basalt fiber 5 parts, Portland cement 45 parts, coral sand 950 parts, and water 200 parts.

[0073] That is, the difference between Comparative Example 2 and Example 3 is that Comparative Example 2 uses an equal amount of Portland cement to replace hydrophilic nano-silica, and the others are the same as Example 3.

[0074] The preparation method of the coral sand composite material of Comparative Example 2 is as follows:

[0075] The basalt fiber is added to the coral sand and stirred thoroughly to make the basalt fiber evenly distributed. Then cement and water are added and mixed. After thorough stirring, the sample is divided into four layers and compacted and scraped to form a mold. After curing for seven days, the coral sand composite material is obtained, and the dry density of the coral sand composite material is 1.39g / cm 3 , and the size of the cylindrical body is 50mm in diameter and 100mm in height.

[0076] Comparative Example 3

[0077] Comparative Example 3 provides a coral sand composite material of 20% hydrophilic nano-silica and 5% basalt fiber reinforced coral sand. The raw materials used are as follows: hydrophilic nano-silica 10 parts, basalt fiber 40 parts, coral sand 950 parts, and water 200 parts.

[0078] That is, the difference between Comparative Example 3 and Example 3 is that Comparative Example 3 uses an equal amount of basalt fiber to replace Portland cement, and the others are the same as Example 3.

[0079] The preparation method of the coral sand composite material of Comparative Example 3 is as follows:

[0080] (1) Hydrophilic nano-silica is added into water and stirred thoroughly to prepare a nano-silica suspension; basalt fiber is added into coral sand and stirred thoroughly to make the basalt fiber uniformly dispersed, thereby preparing a mixture;

[0081] (2) The nano-silica suspension is added into the mixture, and after being stirred thoroughly, the sample is divided into four layers and compacted by a layered compaction method, and then scraped and placed into a mold. After curing for seven days, a coral sand composite material is obtained, and the dry density of the coral sand composite material is 1.39 g / cm 3 , and the size of the cylinder is 50 mm in diameter and 100 mm in height.

[0082] Comparative Example 4

[0083] Comparative Example 4 provides a coral sand composite material prepared by using oleophilic nano-silica. The raw materials used are as follows: 10 parts of oleophilic nano-silica, 5 parts of basalt fiber, 35 parts of Portland cement, 950 parts of coral sand, and 200 parts of water.

[0084] The difference between Comparative Example 4 and Example 3 is that Comparative Example 4 uses an equal amount of oleophilic nano-silica to replace the hydrophilic nano-silica, and the other raw materials, amounts, and preparation methods are the same as those of Example 3.

[0085] Comparative Example 5

[0086] Comparative Example 5 provides a coral sand composite material prepared by using pure 5% cement reinforced coral sand. The raw materials used are as follows: 50 parts of Portland cement, 950 parts of coral sand, and 200 parts of water.

[0087] The difference between Comparative Example 5 and Example 3 is that Comparative Example 5 uses an equal amount of Portland cement to replace the basalt fiber and an equal amount of Portland cement to replace the hydrophilic nano-silica.

[0088] The preparation method of the coral sand composite material of Comparative Example 5 is as follows:

[0089] Water, cement, and coral sand are mixed and stirred thoroughly, and then poured into a mold. The sample in the mold is cured for seven days to obtain a coral sand composite material without reinforcement.

[0090] Comparative Example 6

[0091] Comparative Example 6 provides a coral sand composite material prepared by using pure 7% cement reinforced coral sand. The raw materials used are as follows: 70 parts of Portland cement, 930 parts of coral sand, and 200 parts of water.

[0092] The difference between Comparative Example 6 and Example 3 is that Comparative Example 6 uses an equal amount of Portland cement to replace basalt fiber, an equal amount of Portland cement to replace hydrophilic nano-silica, and 20 parts of Portland cement to replace 20 parts of coral sand.

[0093] The preparation method of the coral sand composite material of Comparative Example 6 is specifically as follows:

[0094] Water, Portland cement and coral sand are mixed, and after being fully stirred, the mixture is poured into a mold; the sample in the mold is cured for seven days to obtain a coral sand composite material without reinforcement.

[0095] Performance test

[0096] The coral sand composite materials prepared in Examples 1-4 and Comparative Examples 1-6 are subjected to a drained shear triaxial test under the condition of an effective confining pressure of 100 kPa and a shear rate of 0.2 mm / min, and the results of the drained shear triaxial test are shown in Table 1, Figures 2-3 .

[0097] Table 1: Results of drained shear triaxial test

[0098] Group Peak intensity / kPa Residual intensity / kPa Example 1 487 360 Example 2 561 430 Example 3 857 519 Example 4 702 448 Comparative Example 1 775 490 Comparative Example 2 523 347 Comparative Example 3 452 390 Comparative Example 4 581 294 Comparative Example 5 503 316 Comparative Example 6 644 442

[0099] As can be seen from Table 1, the coral sand composite material of the present application has good peak strength and residual strength.

[0100] Figure 2 The drained shear curve of the coral sand composite material of Example 3 and Comparative Examples 1-6 is shown in FIG. 1, in which 5% cement (containing 10 parts of hydrophilic nano-silica + 0 parts of basalt fiber), 5% cement (containing 0 parts of hydrophilic nano-silica + 5 parts of basalt fiber), 5% fiber (containing 10 parts of hydrophilic nano-silica + 0 parts of cement), 5% cement (containing 10 parts of hydrophilic nano-silica + 5 parts of basalt fiber), 5% cement (containing 10 parts of hydrophilic nano-silica + 5 parts of basalt fiber), 5% cement (containing 0 parts of hydrophilic nano-silica + 0 parts of basalt fiber), and 7% cement (containing 0 parts of hydrophilic nano-silica + 0 parts of basalt fiber) represent the coral sand composite materials of Comparative Examples 1-4, Example 3, and Comparative Examples 5-6, respectively.

[0101] Figure 3 The drained shear curve of the coral sand composite material of Example 1-4 is shown in FIG. 2, in which 3% cement (containing 3 parts of hydrophilic nano-silica + 3 parts of basalt fiber), 3% cement (containing 6 parts of hydrophilic nano-silica + 3 parts of basalt fiber), 5% cement (containing 10 parts of hydrophilic nano-silica + 5 parts of basalt fiber), and 5% cement (containing 10 parts of hydrophilic nano-silica + 10 parts of basalt fiber) represent the coral sand composite materials of Examples 1-4, respectively.

[0102] As can be seen from FIGS. 1 and 2, the coral sand composite material of the present application has good peak strength and residual strength.Figure 2 It can be seen from the data in Table 1 that with the increase of axial strain, the deviatoric stress shows a trend of first increasing and then decreasing.

[0103] Comparative Example 1 uses an equal amount of Portland cement to replace basalt fiber, Comparative Example 2 uses an equal amount of Portland cement to replace hydrophilic nano-silica, and Comparative Example 3 uses an equal amount of basalt fiber to replace Portland cement. As a result, the peak strength and residual strength of the coral sand composite materials of Comparative Examples 1-3 are all lower than those of Example 3. This indicates that there is a synergistic effect between the hydrophilic nano-silica, basalt fiber, and cement. The combined effect of the three makes the coral sand composite material have good mechanical properties, such as high peak strength and residual strength.

[0104] Comparative Example 4 uses an equal amount of oleophilic nano-silica to replace the hydrophilic nano-silica, so that the peak strength and residual strength of the coral sand composite material of Comparative Example 4 are significantly lower than those of Example 3, indicating that the present invention is selective for the type of nano-silica, and only by using hydrophilic nano-silica can the coral sand composite material have good mechanical properties, such as high peak strength and residual strength.

[0105] Comparative Example 5 uses an equal amount of Portland cement to replace the basalt fiber, and an equal amount of Portland cement to replace the hydrophilic nano-silica, that is, Comparative Example 5 uses pure 5% cement to reinforce the coral sand; Comparative Example 6 uses an equal amount of Portland cement to replace the basalt fiber, an equal amount of Portland cement to replace the hydrophilic nano-silica, and 20 parts of Portland cement to replace 20 parts of the coral sand, that is, Comparative Example 6 uses pure 7% cement to reinforce the coral sand, so that the peak strength and residual strength of the coral sand composite material of Comparative Example 5-6 are significantly lower than those of Example 3. This shows that if only Portland cement is added without adding hydrophilic nano-silica and basalt fiber, there is no synergistic effect between the three, and even if the amount of cement is increased, the peak strength and residual strength of the coral sand composite material cannot be effectively improved, and the increase in cement content will correspondingly increase energy consumption.

[0106] Depend on Figure 3 It can be seen from the data in Table 1 that with the increase of axial strain, the deviatoric stress shows a trend of first increasing and then decreasing to a stable state; with the increase of hydrophilic nano-silica or cement content, the peak strength and residual strength of the coral sand composite material will increase accordingly. With the increase of basalt fiber content, the peak strength and residual strength of the sample show a trend of first increasing and then decreasing. The peak strength and residual strength of the coral sand composite material with a cement content of 3% in Example 2 (hydrophilic nano-silica accounts for 20% of the mass of cement and basalt fiber accounts for 10% of the mass of cement) are greater than those of 5% pure cement reinforced coral sand, that is, the present invention can still obtain better peak strength and residual strength under the condition of low cement addition, and the reduction in cement usage can effectively reduce energy consumption.

[0107] In summary, the hydrophilic nano-silica, cement and fibers have synergistic effect, and the three together can make the coral sand composite material have good strength, and the synergistic effect of the three can also reduce the amount of cement clinker, effectively reduce energy consumption, and reduce the adverse effects on the environment during the production of cement.

[0108] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A coral sand composite material, characterized in that: Its raw material components include hydrophilic nano-silica, cement, coral sand, basalt fiber and water.

2. The coral sand composite material according to claim 1, wherein The cement includes Portland cement.

3. The coral sand composite material according to claim 1, wherein The amount of the cement used is 2.0-4.5% of the weight of the coral sand.

4. The coral sand composite material according to claim 1, characterized in that The particle size of the coral sand is 0.075-2.00 mm; and / or the porosity ratio of the coral sand is 0.85-1.47; and / or the specific gravity of the coral sand is 2.5-3.0 tons / cubic meter.

5. The coral sand composite material according to claim 1, characterized in that The hydrophilic nano-silica is a coupling agent-modified nano-silica; and / or the particle size of the hydrophilic nano-silica is 16-25 nm; and / or the specific surface area of ​​the hydrophilic nano-silica is 175-195 m 2 / g; and / or, the diameter of the basalt fiber is 15-20μm; and / or, the length of the basalt fiber is 3-6mm.

6. The coral sand composite material according to any one of claims 1 to 5, characterized in that: Calculated by weight, the raw material components of the coral sand composite material include 2.7-11 parts of hydrophilic nano-silicon dioxide, 20-38 parts of cement, 920-970 parts of coral sand, 2.7-11 parts of basalt fiber, and 180-220 parts of water.

7. The method for preparing the coral sand composite material according to any one of claims 1 to 6, wherein: The following steps are involved: The raw material components are mixed to obtain aggregate, which is then poured and cured to obtain the coral sand composite material.

8. The preparation method according to claim 7, characterized in that The preparation process of the aggregate comprises the following steps: Mixing the hydrophilic nano-silica and water to obtain a silica mixed solution; Mixing the cement, coral sand and basalt fiber to obtain a mixture; The mixed material and the silicon dioxide mixed liquid are mixed to obtain the aggregate.

9. The preparation method according to claim 7, characterized in that The pouring process includes: filling the aggregate into a mold using a layered compaction method; and / or, the curing time is 4.5-11 days.

10. A coral sand foundation, characterized in that: The coral sand composite material comprises the coral sand composite material according to any one of claims 1 to 6.

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