Concrete based on modified shale ceramsite and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and relates to concrete based on modified shale ceramsite and a preparation method thereof. The invention provides a preparation method of concrete based on modified shale ceramisite, which comprises the following steps: immersing shale ceramisite into 1-5wt% of ethyl cellulose solution, taking out, curing at 160-180 DEG C, mixing with 10-20wt% of phenolic resin solution, taking out after the solvent is completely volatilized, and curing at 140-160 DEG C to obtain the modified shale ceramisite; uniformly mixing the modified shale ceramsite, cement and fine aggregate, adding water, a water reducing agent and an air entraining agent, and fully stirring to obtain the concrete. The invention aims to solve the technical problems that the shale ceramsite and cement mortar are high in density, so that the concrete doped with the shale ceramsite is easy to layer and separate, the slump loss is large, and cracks are easy to generate due to high water absorption.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials and relates to a concrete based on modified shale ceramsite and a preparation method thereof. Background Art

[0002] Lightweight aggregate concrete is a kind of concrete that uses lightweight porous aggregates to replace traditional sand and gravel. Most of it is ceramsite concrete, and the output of lightweight aggregate concrete such as zeolite and coal gangue is less. Due to its unique structure, the strength source of ceramsite concrete is quite different from that of ordinary concrete. Some studies have shown that in ordinary concrete of general strength grades, the strength of the aggregates is hardly utilized, and the failure of the concrete is determined by the other two phases in the concrete, namely the cement paste and the interfacial transition zone between the hardened cement paste and the aggregates. Therefore, in ordinary concrete, the strength of the coarse aggregate particles will not have a significant impact on the concrete strength. However, the situation of ceramsite concrete is exactly the opposite. The strength and elastic modulus of ceramsite are often lower than those of the cement mortar matrix. When a pressure load acts on the ceramsite particles, compressive stresses are generated on both sides of the aggregates. In addition, the surface of the ceramsite is rough, with a large specific surface area, strong adhesion to the cement mortar, and it is not easy to generate interfacial cracks. Also, due to the "micro-pump" effect of the ceramsite in the concrete, it absorbs part of the water, reduces the water-cement ratio in the aggregate interfacial zone, eliminates the water cavities similar to those under ordinary coarse aggregates, that is, the internal stratification of the concrete, thereby improving the density of the cement paste and its interface. During the long-term hydration process, the water absorbed by the ceramsite will be released again, continuously providing water for the unhydrated cement particles, further filling the pores in the interfacial transition zone between the ceramsite and the concrete, and increasing the interfacial bonding force; at the same time, as the water migrates outwards, a certain "self-vacuum" is formed inside the ceramsite, which also improves the strength of the ceramsite concrete. Shale ceramsite concrete is a kind of ceramsite concrete with shale ceramsite as the main aggregate material, which has good lightweight, heat insulation, compressive and crack resistance properties, and the changes in strength and deformation properties are relatively stable.

[0003] Due to the light weight of the aggregate, ceramsite concrete has a great impact on the construction performance. For freshly mixed ceramsite concrete, good workability mainly refers to good fluidity and no segregation. Existing research results show that the main technologies for preparing ceramsite concrete with excellent workability are through controlling the particle size of ceramsite, adding viscosity-increasing and plasticizing admixtures, adding air-entraining agents, setting up a grid that can inhibit the floating of ceramsite, and optimizing mix ratio parameters, etc. Since ceramsite is prone to floating and the stability of the mixture is poor, ceramsite concrete is not suitable for having too high fluidity. Therefore, the mixing process and pouring and vibrating technology of ceramsite concrete are different from those of ordinary concrete. A reasonable mixing process and vibration can not only improve the construction performance of ceramsite concrete, but also contribute to the improvement of strength. The pre-wetting process of ceramsite also has a great impact on the construction performance of ceramsite concrete. After pre-wetting treatment, it can not only improve the workability of concrete, reduce the slump loss over time, but also play an important role in the mechanical properties, volume stability and durability of concrete. However, the determination of the pre-wetting time mainly relies on experience and lacks scientific basis, which affects the performance stability of multiple batches of concrete. Summary of the Invention

[0004] The present invention aims to solve the technical problems that the density of shale ceramsite and cement mortar is large, resulting in easy stratification and segregation of concrete containing shale ceramsite, large slump loss, and high water absorption leading to easy generation of cracks. In this regard, the present invention provides a concrete based on modified shale ceramsite and its preparation method to meet this need in the field. By means of synergistically modifying shale ceramsite with ethyl cellulose and phenolic resin, a dense and compact surface layer with certain hydrophobic properties is formed on the surface of shale ceramsite. Thus, while maintaining the light weight characteristics of shale ceramsite, its particle strength is improved and the water absorption rate is reduced, ultimately enhancing the stability of the concrete and avoiding the occurrence of cracks.

[0005] On the one hand, the present invention relates to a preparation method of a concrete based on modified shale ceramsite, which includes: immersing shale ceramsite in a 1-5 wt% ethyl cellulose solution, taking it out and curing at 160-180 °C, mixing it with a 10-20 wt% phenolic resin solution, and taking it out and curing at 140-160 °C after the solvent has completely volatilized to obtain modified shale ceramsite;

[0006] After uniformly mixing the modified shale ceramsite, cement and fine aggregate, then adding water, water reducer and air-entraining agent, and fully stirring to obtain the concrete.

[0007] Optionally, the cement is at least one of ordinary Portland cement, slag-based geopolymer cement, alkali-activated slag cement or sulfoaluminate cement.

[0008] Generally, in the preparation method of the concrete based on modified shale ceramsite provided by the present invention, the admixtures are not limited to water reducer and air-entraining agent, and may also include defoaming agent and early strength agent.

[0009] Exemplarily, the water reducing agent is a naphthalene series high range water reducing agent, sodium lignosulfonate water reducing agent, amino high range water reducing agent, or polycarboxylate high range water reducing agent; the air entraining agent is a rosin resin type air entraining agent, alkyl type air entraining agent, or sulfonic acid type air entraining agent; the defoaming agent is a silicone type defoaming agent, polyether type defoaming agent, or polyether modified polysiloxane type defoaming agent; the early strength agent is nitrite, calcium formate, composite early strength agent, or triethanolamine.

[0010] Further, in the method for preparing the concrete based on modified shale ceramsite provided by the present invention, 30 - 60 mL of the phenolic resin solution is used for every 50 g of shale ceramsite.

[0011] Further, in the method for preparing the concrete based on modified shale ceramsite provided by the present invention, by mass, the raw materials of the concrete include: 470 - 510 parts of modified shale ceramsite, 450 - 530 parts of cement, 580 - 620 parts of fine aggregate, 3 - 6 parts of water reducing agent, 0.5 - 1 part of air entraining agent, and 180 - 210 parts of water.

[0012] Further, in the method for preparing the concrete based on modified shale ceramsite provided by the present invention, by mass, the raw materials of the concrete include: 492 parts of modified shale ceramsite, 500 parts of cement, 608 parts of fine aggregate, 5.27 parts of water reducing agent, 0.73 part of air entraining agent, and 184 parts of water.

[0013] Further, in the method for preparing the concrete based on modified shale ceramsite provided by the present invention, the fine aggregate is a mixture of natural sand and artificial sand, and the fineness modulus is 2.65.

[0014] Further, in the method for preparing the concrete based on modified shale ceramsite provided by the present invention, the solvents of the ethyl cellulose solution or the phenolic resin solution are independently selected from at least one of chloroform, ethanol, or methanol.

[0015] Further, in the method for preparing the concrete based on modified shale ceramsite provided by the present invention, the curing time after immersing the shale ceramsite in the ethyl cellulose solution and taking it out is 1.5 - 3 h, and the curing time after taking it out when the solvent has completely volatilized is 4 - 8 h.

[0016] Further, in the method for preparing the concrete based on modified shale ceramsite provided by the present invention, the particle size of the shale ceramsite is not higher than 16 mm.

[0017] On the other hand, the present invention relates to a concrete based on modified shale ceramsite, which is prepared by using the method for preparing the concrete based on modified shale ceramsite described above.

[0018] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects or advantages:

[0019] Through the synergistic modification mechanism of ethyl cellulose and phenolic resin, the present invention forms a dense hydrophobic layer on the surface of shale ceramsite, fundamentally optimizing the performance of concrete. As a film-forming agent, ethyl cellulose dissolves in solvents such as ethanol and penetrates into the pores of shale ceramsite. After curing at 160-180°C, a uniform coating is formed, significantly reducing the surface hydrophilicity. Subsequently, the introduced phenolic resin solution undergoes a polycondensation reaction during curing at 140-160°C, crosslinking with active groups such as hydroxyl groups on the surface of ethyl cellulose and shale ceramsite to form a three-dimensional network structure, further enhancing the surface density and hydrophobicity. This dual modification not only closes the water absorption channels of shale ceramsite but also effectively inhibits the floating of aggregates and the segregation of cement paste by improving the particle strength and interfacial bonding force. Through the synergistic effect of surface chemical modification and physical structure optimization, the present invention achieves breakthroughs in dimensions such as light weight, crack resistance, and workability. Detailed implementation manners

[0020] Next, the technical solution of the present invention will be described in conjunction with embodiments. However, the present invention is not limited to the following embodiments. The experimental methods and detection methods described in each embodiment are all conventional methods unless otherwise specified; the reagents and materials described are all commercially available unless otherwise specified. The percentages in the following embodiments are all mass percentage contents unless otherwise specified. The ratios in the following embodiments are all mass ratios unless otherwise specified.

[0021] In the following embodiments, the cement is ordinary Portland cement, which is the bagged P.O 42.5 produced by China Gezhouba Group Cement Co., Ltd.; the fine aggregate is a mixture of natural sand and artificial sand with a fineness modulus of 2.65; the water reducing agent is the high-efficiency retarding water reducing agent G454 produced by Kunming Baiyi Building Materials Manufacturing Co., Ltd., and the air-entraining agent is the concrete air-entraining agent AE-1450, purchased from Nanjing Xinhai Trading Co., Ltd. Ethyl cellulose with an ethoxy content of 48.0-49.5% is purchased from Shandong Xuchen Chemical Technology Co., Ltd. Phenolic resin with a molecular weight of 122.12134 is purchased from Shandong Guohua Chemical Co., Ltd.

[0022] Shale ceramsite with a particle size of 8-15 mm and a bulk density of 530 kg / m 3 and an apparent density of 700 kg / m 3 with a 24-hour water absorption rate of 14%, a cylinder compressive strength of 3.2 MPa, a flaky and elongated particle content of <10%, and a mud content of <1%, meeting the standard technical requirements of GB / T 17431.1-2010 "Lightweight Aggregates and Their Test Methods - Part 1: Lightweight Aggregates".

[0023] Example 1

[0024] This embodiment provides a preparation process of modified shale ceramsite.

[0025] Modified shale ceramsite #1: Prepare an ethanol solution of 1 wt% ethyl cellulose; after washing the shale ceramsite, dry it at 120 °C for 3 h, then place it in a container, fully immerse it in the ethanol solution of 1 wt% ethyl cellulose, press it with a grid, and let it stand for 12 h; take out the particles, filter the excess liquid, then place them in the container at room temperature for 24 h, place them in an oven and cure at 160 °C for 1.5 h, and pay attention to continuous stirring to prevent the particles from caking; take out the cured particles and place them in a blender, keep stirring, and add 30 mL of an ethanol solution of 10 wt% phenolic resin for every 50 g of shale ceramsite; take out the particles after the solvent has completely volatilized, place them in an oven and cure at 140 °C for 4 h to obtain the modified shale ceramsite.

[0026] Modified shale ceramsite #2: Prepare an ethanol solution of 1 wt% ethyl cellulose; after washing the shale ceramsite, dry it at 120 °C for 3 h, then place it in a container, fully immerse it in the ethanol solution of 1 wt% ethyl cellulose, press it with a grid, and let it stand for 12 h; take out the particles, filter the excess liquid, then place them in the container at room temperature for 24 h, place them in an oven and cure at 160 °C for 2 h, and pay attention to continuous stirring to prevent the particles from caking; take out the cured particles and place them in a blender, keep stirring, and add 40 mL of an ethanol solution of 14 wt% phenolic resin for every 50 g of shale ceramsite; take out the particles after the solvent has completely volatilized, place them in an oven and cure at 140 °C for 6 h to obtain the modified shale ceramsite.

[0027] Modified shale ceramsite #3: Prepare an ethanol solution of 2 wt% ethyl cellulose; after washing the shale ceramsite, dry it at 120 °C for 3 h, then place it in a container, fully immerse it in the ethanol solution of 2 wt% ethyl cellulose, press it with a grid, and let it stand for 12 h; take out the particles, filter the excess liquid, then place them in the container at room temperature for 24 h, place them in an oven and cure at 160 °C for 3 h, and pay attention to continuous stirring to prevent the particles from caking; take out the cured particles and place them in a blender, keep stirring, and add 50 mL of an ethanol solution of 18 wt% phenolic resin for every 50 g of shale ceramsite; take out the particles after the solvent has completely volatilized, place them in an oven and cure at 140 °C for 8 h to obtain the modified shale ceramsite.

[0028] Modified shale ceramsite #4: Prepare an ethanol solution containing 5 wt% ethyl cellulose; after washing the shale ceramsite, dry it at 120 °C for 3 h, then place it in a container, fully immerse it in the ethanol solution containing 5 wt% ethyl cellulose, press it with a grid, and let it stand for 12 h; take out the particles and filter the excess liquid, then place them in the container at room temperature for 24 h, place them in an oven and cure at 180 °C for 3 h, noting to keep stirring to prevent the particles from caking; take out the cured particles and place them in a blender, keep stirring, and add 60 mL of an ethanol solution containing 20 wt% phenolic resin for every 50 g of shale ceramsite; after the solvent has completely evaporated, take out the particles and place them in an oven and cure at 160 °C for 8 h to obtain the modified shale ceramsite.

[0029] Modified shale ceramsite #5: Prepare an ethanol solution containing 5 wt% ethyl cellulose; after washing the shale ceramsite, dry it at 120 °C for 3 h, then place it in a container, fully immerse it in the ethanol solution containing 5 wt% ethyl cellulose, press it with a grid, and let it stand for 12 h; take out the particles and filter the excess liquid, then place them in the container at room temperature for 24 h, place them in an oven and cure at 180 °C for 3 h, noting to keep stirring to prevent the particles from caking; take out the cured particles and place them in a blender, keep stirring, and add 60 mL of an ethanol solution containing 80 wt% phenolic resin for every 50 g of shale ceramsite; after the solvent has completely evaporated, take out the particles and place them in an oven and cure at 160 °C for 8 h to obtain the modified shale ceramsite.

[0030] Modified shale ceramsite #6: Prepare an ethanol solution containing 0.1 wt% ethyl cellulose; after washing the shale ceramsite, dry it at 120 °C for 3 h, then place it in a container, fully immerse it in the ethanol solution containing 0.1 wt% ethyl cellulose, press it with a grid, and let it stand for 12 h; take out the particles and filter the excess liquid, then place them in the container at room temperature for 24 h, place them in an oven and cure at 180 °C for 3 h, noting to keep stirring to prevent the particles from caking; take out the cured particles and place them in a blender, keep stirring, and add 60 mL of an ethanol solution containing 1 wt% phenolic resin for every 50 g of shale ceramsite; after the solvent has completely evaporated, take out the particles and place them in an oven and cure at 160 °C for 8 h to obtain the modified shale ceramsite.

[0031] The present invention applies an ethyl cellulose solution to modify the surface of shale ceramsite to enhance its hydrophobic property. Under heating or acidic conditions, the hydroxymethyl groups in phenolic resin can undergo polycondensation between each other, and the ortho- and para-positions of hydroxymethyl groups with phenol or substituted phenol can crosslink to form a high-hardness three-dimensional polymer. At the same time, phenolic resin can also react with the reactive groups existing in ethyl cellulose and on the surface of shale ceramsite, improving the compatibility between the modifier and shale ceramsite. Finally, a dense and solid surface layer with certain hydrophobic property is formed on the surface of shale ceramsite. While maintaining the light weight feature of shale ceramsite, its particle strength is enhanced and water absorption rate is reduced, ultimately improving the stability of concrete and avoiding the occurrence of cracks. Note that when preparing modified shale ceramsite, no curing agent or coupling agent needs to be added. Adding a curing agent will cause excessive adhesion of ethyl cellulose and phenolic resin to shale ceramsite, resulting in pore blockage, decreased surface roughness, and decreased bonding strength.

[0032] Example 2

[0033] This example provides the preparation process of concrete based on modified shale ceramsite.

[0034] Since this example aims to verify the improvement effect of modified shale ceramsite on concrete, modified shale ceramsite or shale ceramsite is not pre-wetted in the preparation process.

[0035] Concrete 1#: By mass, 470 parts of modified shale ceramsite #1, 450 parts of cement, and 580 parts of fine aggregate are stirred in a mixer for 15 s, then 3 parts of water reducing agent, 0.5 part of air entraining agent, and 180 parts of water are poured into the mixer and stirred evenly for 2 min; the concrete is filled into a test mold pre-brushed with lubricating oil (to make a concrete prism specimen of 100 mm × 100 mm × 300 mm) with a trowel, and the internal air bubbles are removed using a vibrator, demolded after standing for 24 h, and cured under standard conditions for 28 d.

[0036] Concrete 2#: By mass, 440 parts of modified shale ceramsite #2, 480 parts of cement, and 600 parts of fine aggregate are stirred in a mixer for 15 s, then 4 parts of water reducing agent, 0.6 part of air entraining agent, and 200 parts of water are poured into the mixer and stirred evenly for 2 min; the concrete is filled into a test mold pre-brushed with lubricating oil (to make a concrete prism specimen of 100 mm × 100 mm × 300 mm) with a trowel, and the internal air bubbles are removed using a vibrator, demolded after standing for 24 h, and cured under standard conditions for 28 d.

[0037] Concrete 3#: By mass, 492 parts of modified shale ceramsite #3, 500 parts of cement, and 608 parts of fine aggregate are stirred in a mixer for 15 s, then 5.27 parts of water reducing agent, 0.73 parts of air entraining agent, and 184 parts of water are poured into the mixer and stirred evenly for 2 min; The concrete is filled into a test mold pre-brushed with lubricating oil (to make a concrete prism specimen of 100 mm×100 mm×300 mm) with a trowel, and the internal air bubbles are eliminated by a vibrator, demolded after standing for 24 h, and cured under standard conditions for 28 d.

[0038] Concrete 4#: By mass, 510 parts of modified shale ceramsite #4, 530 parts of cement, and 620 parts of fine aggregate are stirred in a mixer for 15 s, then 6 parts of water reducing agent, 1 part of air entraining agent, and 210 parts of water are poured into the mixer and stirred evenly for 2 min; The concrete is filled into a test mold pre-brushed with lubricating oil (to make a concrete prism specimen of 100 mm×100 mm×300 mm) with a trowel, and the internal air bubbles are eliminated by a vibrator, demolded after standing for 24 h, and cured under standard conditions for 28 d.

[0039] Concrete 5#: By mass, 510 parts of modified shale ceramsite #5, 530 parts of cement, and 620 parts of fine aggregate are stirred in a mixer for 15 s, then 6 parts of water reducing agent, 1 part of air entraining agent, and 210 parts of water are poured into the mixer and stirred evenly for 2 min; The concrete is filled into a test mold pre-brushed with lubricating oil (to make a concrete prism specimen of 100 mm×100 mm×300 mm) with a trowel, and the internal air bubbles are eliminated by a vibrator, demolded after standing for 24 h, and cured under standard conditions for 28 d.

[0040] Concrete 6#: By mass, 510 parts of modified shale ceramsite #6, 530 parts of cement, and 620 parts of fine aggregate are stirred in a mixer for 15 s, then 6 parts of water reducing agent, 1 part of air entraining agent, and 210 parts of water are poured into the mixer and stirred evenly for 2 min; The concrete is filled into a test mold pre-brushed with lubricating oil (to make a concrete prism specimen of 100 mm×100 mm×300 mm) with a trowel, and the internal air bubbles are eliminated by a vibrator, demolded after standing for 24 h, and cured under standard conditions for 28 d.

[0041] Concrete 7#: By mass, 510 parts of shale ceramsite, 530 parts of cement, and 620 parts of fine aggregate are stirred in a mixer for 15 s, then 6 parts of water reducing agent, 1 part of air entraining agent, and 210 parts of water are poured into the mixer and stirred evenly for 2 min; The concrete is filled into a test mold pre-brushed with lubricating oil (to make a concrete prism specimen of 100 mm×100 mm×300 mm) with a trowel, and the internal air bubbles are eliminated by a vibrator, demolded after standing for 24 h, and cured under standard conditions for 28 d.

[0042] (1) Axial compressive strength test:

[0043] The strength test was carried out using a universal testing machine of model WAW-600. Before the test, the upper and lower contact surfaces of the press need to be wiped, the chassis is adjusted, the specimen is placed in the center of the chassis, and the height of the press is slowly adjusted. The loading rate is set at 3 MPa / s, meeting the "Standard Test Method for Mechanical Properties of Ordinary Concrete" (GB / T 50081-2002). To reduce the error caused by discreteness, three specimens are used in each group for the test, and the average value of the axial compressive strength is taken. If the measured value exceeds 15% of the median value, then this value is discarded and the median value is taken for calculation. In this test, non-standard specimens are used, and a conversion factor of 0.95 should be multiplied during the calculation.

[0044] (2)Water absorption test:

[0045] Take test specimens of the same mass and place them in a container, making them completely sink in water and soak for 3 days. Record the mass before soaking as m, the mass after soaking as M, and the water absorption is [(M - m) / m]×100%.

[0046] (3)Segregation resistance performance test:

[0047] The segregation resistance of the concrete mixture is evaluated by the slump loss. The slump loss test measures the difference in the compressive strength of the test blocks formed by the upper and lower layer mixtures in the slump loss bucket (the slump loss bucket is divided into three layers: upper, middle, and lower, each layer is 100 mm high and 200 mm long) after 20 s of vibration, and respectively takes the difference in the 28-day compressive strength of the test blocks formed manually from the upper and lower layer concrete mixtures in the slump loss bucket after vibration. The vibration is carried out on a vibrating table with a vibration frequency of 50 Hz and an amplitude of 0.5 mm. The segregation resistance performance is measured by the difference in compressive strength. The compressive strength of the test block formed by the upper layer mixture is f1, the compressive strength of the test block formed by the lower layer mixture is f2, and the difference in compressive strength is [2(f1 - f2) / (f1 + f2)]×100%.

[0048] The test results are shown in Table 1.

[0049] Table 1 Test results of concrete performance

[0050] As can be seen from Table 1, in the present invention, the shale ceramsite is synergistically modified by 1-5 wt% ethyl cellulose solution and 10-20 wt% phenolic resin solution, and the prepared concrete has the advantages of high compressive strength, low water absorption, low difference in compressive strength, and high slump. When using a phenolic resin solution with too high a concentration (Concrete 5#), although the compressive strength of the concrete can be improved, the difference in its compressive strength is too large, which is extremely likely to cause the concrete to crack and is difficult to apply. When using ethyl cellulose solution and phenolic resin solution with too low a concentration (Concrete 6#), the improvement effect is not obvious, and it is similar to the effect of directly using shale ceramsite.

[0051] As described above, the basic principles, main features and advantages of the present invention are preferably described. The above embodiments and the description are only descriptions of the preferred embodiments of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, various changes and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the present invention.

Claims

1. A preparation method of concrete based on modified shale ceramsite, characterized in that Comprising: Immerse shale ceramsite in 1 - 5 wt% ethyl cellulose solution, take it out and cure at 160 - 180 °C, mix it with 10 - 20 wt% phenolic resin solution, take it out after the solvent completely volatilizes and cure at 140 - 160 °C to obtain modified shale ceramsite; After uniformly mixing the modified shale ceramsite, cement and fine aggregate, then add water, water reducing agent and air entraining agent, and fully stir to obtain the concrete.

2. The preparation method of the concrete based on modified shale ceramsite according to claim 1, characterized in that, For every 50 g of shale ceramsite, 30 - 60 mL of the phenolic resin solution is used.

3. The preparation method of the concrete based on modified shale ceramsite according to claim 1, characterized in that, By mass, the raw materials of the concrete include: 470 - 510 parts of modified shale ceramsite, 450 - 530 parts of cement, 580 - 620 parts of fine aggregate, 3 - 6 parts of water reducing agent, 0.5 - 1 part of air entraining agent, and 180 - 210 parts of water.

4. The preparation method of the concrete based on modified shale ceramsite according to claim 3, characterized in that By mass, the raw materials of the concrete include: 492 parts of modified shale ceramsite, 500 parts of cement, 608 parts of fine aggregate, 5.27 parts of water reducing agent, 0.73 part of air entraining agent, and 184 parts of water.

5. The preparation method of the concrete based on modified shale ceramsite according to claim 1, characterized in that, The fine aggregate is a mixture of natural sand and artificial sand, and the fineness modulus is 2.

65.

6. The preparation method of the concrete based on modified shale ceramsite according to claim 1, characterized in that, The solvents of the ethyl cellulose solution or the phenolic resin solution are independently selected from at least one of chloroform, ethanol or methanol.

7. The preparation method of the concrete based on modified shale ceramsite according to claim 1, characterized in that, The curing time after taking out the shale ceramsite immersed in the ethyl cellulose solution is 1.5 - 3 h, and the curing time after taking out after the solvent completely volatilizes is 4 - 8 h.

8. The preparation method of the concrete based on modified shale ceramsite according to claim 1, characterized in that, The particle size of the shale ceramsite is not higher than 16 mm.

9. A concrete based on modified shale ceramsite, characterized in that, Prepared by using the preparation method of the concrete based on modified shale ceramsite according to any one of claims 1 - 8.

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