A kind of anti-cracking, anti-bacterial and anti-corrosion tunnel lining concrete and its preparation method

Abstract

The present invention discloses a crack-resistant, antibacterial and anti-erosion tunnel lining concrete and a preparation method thereof. The raw materials of the crack-resistant, antibacterial and anti-erosion tunnel lining concrete include cement, fly ash, mineral powder, silica fume, fine aggregate, coarse aggregate, antibacterial and anti-erosion agent, bagasse fiber, admixture and water. The antibacterial and anti-erosion agent is prepared by reacting cationic modified cellulose and alkyl phosphate and then adding alkali to neutralize; the bagasse fiber is prepared by pre-treating sugarcane bagasse with acetic acid and then performing heat treatment and flash explosion treatment in sequence. The crack-resistant, antibacterial and anti-erosion tunnel lining concrete can further solve the problems of easy cracking, easy erosion, easy corrosion by microorganisms and bacteria, etc. existing in traditional tunnel lining concrete on the basis of meeting the mechanical properties and workability, and has broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of cement concrete, and particularly relates to a crack-resistant, antibacterial and erosion-resistant tunnel lining concrete and a preparation method thereof. Background Art

[0002] With the development and utilization of urban underground space and the need for water environment management, deep sewage transmission tunnel projects are an innovative measure to comprehensively solve urban water problems. Sewage transmission tunnels have the characteristics of large cross-sections, large burial depths, and ultra-long lengths, and are not suitable for maintenance. Tunnel lining concrete has long been in an extremely complex multi-factor coupling service environment such as ion erosion, microbial corrosion, water scouring, dry-wet cycles, and water and soil loads. Once a disease occurs, it cannot be repaired. At the same time, in order not to affect ground traffic and above-ground and underground pipelines and other facilities, shield machines are often used for excavation of underground sewage transmission tunnels. Lining concrete is usually designed as a circular thin-walled structure, which has high requirements for concrete crack resistance. Therefore, the sewage transmission deep tunnel project requires that the concrete has excellent working performance during construction and good crack resistance, antibacterial and anti-erosion properties during service.

[0003] Patent CN 108373303B discloses a method for preparing an antifouling and antibacterial concrete. The antifouling and antibacterial concrete is prepared by the following steps: a carboxylic acid monomer, a polyether macromonomer, a zwitterionic monomer, and a cationic monomer are subjected to a free radical copolymerization reaction in a molar ratio of 3 to 5: 1: 0.05 to 0.5: 0.05 to 0.5 under the action of a redox initiator and a chain transfer agent to obtain an antifouling and antibacterial polycarboxylic acid water reducer; the prepared antifouling and antibacterial polycarboxylic acid water reducer is diluted to a solution with a solid content weight ratio of 15% to 16%, and then mixed into a conventional cementitious material for preparing concrete, and fully mixed to obtain the antifouling and antibacterial concrete, wherein the amount of the antifouling and antibacterial polycarboxylic acid water reducer solution added is 1% to 1.5% of the total weight of the cementitious material. The concrete prepared by this method can meet higher construction requirements and has good application prospects in water conservancy projects and marine engineering. However, the problems of concrete resistance to cracking and erosion are not mentioned, and there is still a threat to the durability of tunnel lining concrete.

[0004] Patent CN 104058704B discloses an antibacterial and anti-seepage concrete and a preparation method thereof. The antibacterial and anti-seepage concrete is prepared by the following steps: drying the filter mud from a sugar factory, mixing it with natural colored jade powder, triethanol distearate, and ethylene distearate amide, dispersing and grinding it for 30 to 40 minutes, and then mixing it with water, stirring it evenly to obtain a mixed slurry; adding alumina, gypsum, borosilicate inorganic glass flakes, cement, sand, gravel and other remaining ingredients to the mixed slurry, mixing them evenly, stirring and reacting for 8 to 12 minutes, and then pouring and vibrating it, and curing it in a humid environment at 5°C to 25°C for 7 to 8 days to obtain the antibacterial and anti-seepage concrete. The concrete prepared by this method uses natural colored jade powder and borosilicate inorganic glass flakes, which increase the concrete's impermeability and antibacterial properties, and improve the concrete's ultimate strain capacity, thereby greatly improving the concrete's crack resistance, reducing cement usage, saving energy, and reducing production costs; by using additives, the concrete's compressive and flexural strengths are increased, the aroma of the concrete is increased, the concrete has good anti-rust, waterproof and anti-seepage properties, and also has good water-reducing, workability, plasticity and pumpability effects, but there is no mention of the concrete's anti-erosion problem, which also poses a threat to the durability of the lining concrete.

[0005] In summary, it is of great significance to develop a crack-resistant, antibacterial and erosion-resistant tunnel lining concrete that, on the basis of meeting the mechanical properties and workability, further solves the problems of traditional tunnel lining concrete such as easy cracking, erosion, and susceptibility to microbial bacterial corrosion. Summary of the invention

[0006] The purpose of the present invention is to provide a crack-resistant, antibacterial and erosion-resistant tunnel lining concrete and a preparation method thereof. The crack-resistant, antibacterial and erosion-resistant tunnel lining concrete, on the basis of meeting the mechanical properties and workability, further solves the problems of easy cracking, easy erosion, easy microbial corrosion and the like existing in traditional tunnel lining concrete.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] Provided is a crack-resistant, antibacterial, and anti-corrosion tunnel lining concrete, comprising the following components by weight:

[0009]

[0010] The molecular structure of the antibacterial and anti-corrosion agent is as shown in formula (1):

[0011]

[0012] In formula (1), n ​​is a natural number of 14 to 18, cell represents a cellulose molecular chain, and R is optionally

[0013] One of;

[0014] The bagasse fiber is prepared by pre-treating bagasse with acetic acid and then sequentially performing heat treatment and flash explosion treatment.

[0015] The antibacterial and anti-corrosion agent in the anti-cracking, antibacterial and anti-corrosion tunnel lining concrete of the present invention comprises: an antibacterial component that can adsorb bacteria with negative charges on the surface, and cause an imbalance in the cell wall structure through electrostatic action, so that the contents leak out, thereby achieving an antibacterial effect; the anti-corrosion component can improve the water repellency and compactness of the concrete, and the hydrophilic phosphate functional group can react with the Na in the pore solution. + , Ca 2+ , K + It can complex with metal cations to form water-insoluble complexes, which fill and block the concrete pores. At the same time, the long carbon chains with hydrophobic properties are distributed inside the concrete to form a hydrophobic surface, which can reduce the adsorption of corrosive ions in sewage and the hydration products of gelled slurry, and improve the concrete's resistance to corrosion by sewage microorganisms. The antibacterial and anti-corrosion agent has good dispersibility in concrete, and the various functional groups work synergistically and promote each other. It has significant antibacterial and anti-corrosion properties, and the resulting concrete has good mechanical properties and workability.

[0016] Bagasse fiber is the main anti-cracking component in the concrete system. On the one hand, it has the advantages of wide source, low price, renewable and degradable, which can effectively reduce resource consumption and reduce environmental pollution. On the other hand, bagasse is pretreated with acetic acid, which can increase the extracellular concentration and cause cell dehydration. The main components of the cell membrane are phospholipids and glycoproteins. Acetic acid will dissolve the lipid part and eventually rupture the cell membrane, improving the subsequent heat treatment and flash blast treatment of bagasse. The tensile and bending properties of the fiber are greatly improved after heat treatment of the bagasse; and the fiber of the bagasse after flash blast treatment becomes fragments, the hemicellulose is almost completely degraded, and the cellulose is separated from the lignin, so that the cellulose is no longer wrapped. After refinement, it becomes soft and fluffy, and the contact area between the fiber and the cement slurry is increased, which is beneficial to the bonding of the fiber and the cement substrate, which greatly improves the cracking problem of the thin-walled circular ring structure of the tunnel lining concrete.

[0017] According to the above scheme, the antibacterial and anti-corrosion agent is prepared by the following method: immersing bagasse cellulose in an alkaline aqueous solution to pre-treat alkaline cellulose, and then obtaining cationic modified cellulose under the simultaneous action of the alkaline aqueous solution and the unsaturated cationic monomer aqueous solution; mixing phosphorus pentoxide and phosphoric acid aqueous solution to react, and then reacting with alkyl alcohol to obtain alkyl phosphate ester; mixing the obtained cationic modified cellulose and alkyl phosphate ester under the action of an initiator, and then adding alkali to neutralize to obtain the antibacterial and anti-corrosion agent.

[0018] Preferably, when alkaline cellulose reacts under the combined action of alkaline aqueous solution and unsaturated cationic monomer, the mass ratio of alkaline cellulose to alkaline aqueous solution is 1:(0.2-0.4); the mass ratio of alkaline cellulose to unsaturated cationic monomer is 1:(0.4-1).

[0019] Preferably, the mass ratio of phosphorus pentoxide, aqueous phosphoric acid solution and alkyl alcohol is (1-3):1:(2-3).

[0020] Preferably, the mass ratio of the cation-modified cellulose to the alkyl phosphate is 1:(0.5-1.5); and the amount of the initiator is 0.5-1% of the mass of the cation-modified cellulose.

[0021] Preferably, the alkaline aqueous solution is one of a calcium hydroxide aqueous solution, a sodium hydroxide aqueous solution, a barium hydroxide aqueous solution, a sodium carbonate aqueous solution, a sodium bicarbonate aqueous solution, and ammonia water.

[0022] Preferably, the unsaturated cationic monomer is one of trimethylallylammonium chloride, dimethylallylammonium chloride, dimethyldiallylammonium chloride, 2-methacryloyloxyethylammonium chloride, and N,N,N-trimethylvinylbenzyl ammonium chloride.

[0023] Preferably, the cellulose content in bagasse cellulose is 80% to 85%.

[0024] Preferably, the concentration of the alkaline aqueous solution is 15% to 20%.

[0025] Preferably, the mass fraction of phosphoric acid in the phosphoric acid aqueous solution is 85% to 90%.

[0026] Preferably, the alkyl alcohol is a straight-chain alkyl alcohol having 14 to 18 carbon atoms.

[0027] Preferably, the initiator is ammonium persulfate.

[0028] Preferably, the specific steps for preparing the antibacterial and anti-corrosion agent include: immersing bagasse cellulose in an alkaline aqueous solution, stirring, soaking, washing, filtering and drying to obtain alkaline cellulose; adding isopropanol to the alkaline cellulose, stirring and heating, while dripping an alkaline aqueous solution and an unsaturated cationic monomer aqueous solution, washing and drying to obtain cationic modified cellulose; adding phosphorus pentoxide and an aqueous phosphoric acid solution, reacting at a constant temperature, adding petroleum ether as a reaction solvent after the reaction is completed, and dripping alkyl alcohols, continuing the constant temperature reaction, adding deionized water after the reaction is completed, hydrolyzing at a constant temperature, adding petroleum ether and standing to separate excess phosphoric acid and alkyl alcohol, removing petroleum ether and water by reduced pressure distillation, and finally placing the residue in a dryer for cooling and drying to obtain alkyl phosphate; and mixing the obtained cationic modified cellulose and alkyl phosphate under the action of an initiator, and then adding alkali to neutralize to obtain the antibacterial and anti-corrosion agent.

[0029] Preferably, the specific steps of the preparation method of the antibacterial and anti-corrosion agent are:

[0030] 1) Soaking bagasse cellulose in an alkaline aqueous solution, stirring for 1.5 h to 2 h, soaking for 24 h to 36 h, washing with water until neutral, filtering, and airing for 24 h to 48 h to obtain alkaline cellulose;

[0031] 2) weighing the alkaline cellulose obtained in step 1), adding isopropanol, stirring and heating to 50° C. to 55° C., adding alkaline aqueous solution and unsaturated cationic monomer aqueous solution dropwise at the same time, keeping the temperature for reaction for 2.5 h to 3 h, washing and drying to obtain cationic modified cellulose;

[0032] 3) Weigh phosphorus pentoxide and phosphoric acid aqueous solution, stir and heat to 160°C to 165°C, keep warm and react for 2h to 2.5h, add petroleum ether after the reaction is complete, and add alkyl alcohol drop by drop, stir and heat to 85°C to 90°C, continue to keep warm and react for 3.5h to 4h, add deionized water after the reaction is complete, and hydrolyze at 60°C to 70°C for 2h to 2.5h, then add petroleum ether and let stand for 0.5h to 1h, separate, reduce pressure, distill, dry and cool to obtain alkyl phosphate;

[0033] 4) nitrogen is introduced into the reaction container for flushing, and then deionized water and the cationic modified cellulose obtained in step 2) are added, the temperature is raised to 60° C. to 70° C. with stirring, and the alkyl phosphate ester and the initiator aqueous solution obtained in step 3) are added dropwise, respectively, for 2.5 h to 3 h. After the addition is completed, the reaction is kept warm for 1.5 h to 2 h, and then the reactants are cooled to terminate the reaction;

[0034] 5) adding sodium hydroxide aqueous solution dropwise to the reactant prepared in step 4) to carry out a neutralization reaction, and adjusting the pH value of the solution to 7-8 to obtain the desired antibacterial and anti-corrosion agent.

[0035] According to the above scheme, the specific steps for preparing the bagasse fiber are: first crush the bagasse to about 1cm to 2cm, then soak it in acetic acid for 36h to 48h and then dry it, then heat the dried material with water vapor for heat treatment, keep it warm for 30min to 45min, then introduce inert gas to increase the pressure to 100MPa to 150MPa, keep the pressure for 20min to 25min, then quickly release the pressure, flash explode, collect, sort, wash and dry to obtain bagasse fiber.

[0036] Preferably, the mass fraction of acetic acid is 10% to 20%.

[0037] Preferably, the water vapor temperature is 110°C to 150°C.

[0038] Preferably, the inert gas is one of nitrogen and carbon dioxide.

[0039] According to the above scheme, the cement has a strength grade of 42.5 and an apparent density of 3.1 g / cm 3 ~3.2g / cm 3 of ordinary Portland cement.

[0040] According to the above scheme, the fly ash is Class I fly ash with a fineness (0.045mm sieve residue) of 6.0% to 6.2% and a water requirement ratio of 92% to 95%.

[0041] According to the above scheme, the mineral powder has a density of 2.88g / cm 3 ~2.90g / cm 3 Specific surface area: 443m 2 / kg~450m 2 / kg of S95 grade slag powder.

[0042] According to the above scheme, the specific surface area of ​​the silica ash is 22000m 2 / kg~24000m 2 / kg, SiO2 content is 90% ~ 95%.

[0043] According to the above scheme, the fine aggregate has a fineness modulus of 2.5-2.7 and an apparent density of 2670 kg / cm 3 ~2698kg / m 3 , artificial sand with mud content of 0.8% to 1.2%.

[0044] According to the above scheme, the coarse aggregate has an apparent density of 2810 kg / cm 3 ~2840kg / cm 3 , continuously graded gravel with crushing value of 7.2% to 8.5% and particle size of 5mm to 16mm.

[0045] According to the above scheme, the admixture is a polycarboxylic acid-based water-reducing agent with a water-reducing rate of 25% to 30%.

[0046] A method for preparing the above-mentioned anti-cracking, anti-bacterial and anti-corrosion tunnel lining concrete is provided, comprising the following steps:

[0047] 1) Weigh a certain amount of bagasse fiber, antibacterial and anti-corrosion agent and part of water according to proportion, add them into a blender, and mix them to obtain a uniform mixture;

[0048] 2) adding cement, mineral powder, fly ash, silica fume, remaining water, part of admixture and fine aggregate to the mixture obtained in step 1) in proportion, stirring evenly to obtain a uniformly mixed cement mortar;

[0049] 3) Adding coarse aggregate and the remaining admixtures to the cement mortar obtained in step 2) in proportion and stirring evenly to obtain crack-resistant, antibacterial and erosion-resistant tunnel lining concrete with a certain fluidity.

[0050] According to the above scheme, in step 1), the amount of water added is 65-75% of the total amount of water.

[0051] According to the above scheme, in step 2), the amount of the admixture added is 50-70% of the total amount of the admixture.

[0052] The beneficial effects of the present invention are:

[0053] 1. The present invention provides a crack-resistant, antibacterial and erosion-resistant tunnel lining concrete, which takes cement, fly ash, mineral powder, silica fume, coarse aggregate and fine aggregate as the main system, synergistic antibacterial and anti-erosion agents, and is supplemented by admixtures and bagasse fiber. The obtained crack-resistant, antibacterial and erosion-resistant tunnel lining concrete can further solve the problems of easy cracking, easy erosion, easy corrosion by microorganisms and bacteria, etc. of traditional tunnel lining concrete on the basis of meeting the mechanical properties and workability. It is simple to prepare and has wide application potential.

[0054] 2. The antibacterial and anti-corrosion agent in the anti-cracking, antibacterial and anti-corrosion tunnel lining concrete of the present invention has good dispersibility in the concrete, and the antibacterial components and the anti-corrosion components act synergistically and promote each other, having significant antibacterial and anti-corrosion properties, and the obtained concrete has good mechanical properties and workability.

[0055] 3. In the present invention, bagasse fiber is used as the main anti-cracking component. The bagasse fiber is prepared by pre-treating sugarcane bagasse with acetic acid and then subjecting it to heat treatment and flash explosion treatment. The tensile and bending properties of the fiber are greatly improved, the contact area between the fiber and the cement slurry is large, and the adhesion between the fiber and the cement substrate is good, which greatly improves the cracking problem of the thin-walled circular ring structure of the tunnel lining concrete. DETAILED DESCRIPTION

[0056] In order to better understand the present invention, the content of the present invention is further described below in conjunction with embodiments, but the content of the present invention is not limited to the scope of the embodiments.

[0057] In the following examples, the specific parameter indicators of the required raw materials are:

[0058] The cement has a strength grade of 42.5 and an apparent density of 3.115 g / cm 3 of ordinary Portland cement.

[0059] The fly ash is Class I fly ash with a fineness (0.045 mm sieve residue) of 6.2% and a water requirement ratio of 95%.

[0060] The mineral powder has a density of 2.90 g / cm 3Specific surface area: 450m 2 / kg of S95 grade slag powder.

[0061] The specific surface area of ​​the silica ash is 24000m 2 / kg, SiO2 content is 95%.

[0062] The fine aggregate has a fineness modulus of 2.7 and an apparent density of 2690 kg / m 3 , artificial sand with mud content of 1.0%.

[0063] The coarse aggregate has an apparent density of 2840 kg / cm 3 , continuous graded gravel with crushing value of 8.5% and particle size of 5mm to 16mm.

[0064] The admixture is a polycarboxylic acid water reducing agent with a water reducing rate of 30%.

[0065] The alkaline aqueous solution is a sodium hydroxide aqueous solution with a concentration of 20%.

[0066] The unsaturated cationic monomer is trimethylallyl ammonium chloride.

[0067] The mass fraction of the phosphoric acid is 85%.

[0068] The alkyl alcohol is a straight-chain alkyl alcohol having 18 carbon atoms.

[0069] The cellulose content of bagasse cellulose is 85%.

[0070] Example 1

[0071] A preparation method of an antibacterial and anti-corrosion agent comprises the following steps:

[0072] 1) Soaking bagasse cellulose in a 20% sodium hydroxide aqueous solution, stirring for 2 hours, soaking for 36 hours, washing with water until neutral, filtering, and airing for 48 hours to obtain alkaline cellulose;

[0073] 2) Weigh 10 g of the alkaline cellulose obtained in step 1), add 30 g of isopropanol, stir and heat to 55° C., and simultaneously dropwise add 3 g of a 20% sodium hydroxide aqueous solution and 5 g of an 80% trimethylallyl ammonium chloride aqueous solution, respectively, and react for 3 h at this temperature. Wash and drain to obtain a cationic modified cellulose with a quaternary ammonium cationic group.

[0074] 3) Weigh 10g of 85% phosphoric acid aqueous solution and 10g of phosphorus pentoxide, stir and heat to 160°C, keep warm for 2h, after the reaction is completed, transfer the above reactants to a three-necked flask with a stirrer, add 3g of petroleum ether, and dropwise add 20g of a straight-chain alkyl alcohol containing 18 carbon atoms, stir and heat to 85°C, keep warm for 3.5h, after the reaction is completed, add 5g of deionized water to the three-necked flask, and hydrolyze at 60°C for 2h, then add 1g of petroleum ether to the three-necked flask and let stand for 0.5h, separate, reduce pressure, distill, dry and cool to obtain an alkyl phosphate containing 18 carbon atoms;

[0075] 4) nitrogen was introduced into the reaction container for flushing, and then 5 g of deionized water and 10 g of the cationic modified cellulose with quaternary ammonium cationic groups obtained in step 2) were added, the temperature was raised to 60° C. with stirring, and 10 g of the alkyl phosphate with a carbon number of 18 obtained in step 3) and 0.1 g of a 60% aqueous solution of ammonium persulfate were added dropwise respectively for 2.5 h. After the addition was completed, the reaction was kept warm for 1.5 h, and then the reactants were cooled to terminate the reaction;

[0076] 5) adding sodium hydroxide aqueous solution dropwise to the reactant prepared in step 4) while stirring to carry out a neutralization reaction, and adjusting the pH value of the solution to 7 to obtain the desired antibacterial and anti-corrosion agent.

[0077] Example 2

[0078] A preparation method of an antibacterial and anti-corrosion agent comprises the following steps:

[0079] 1) Soaking bagasse cellulose in a 20% sodium hydroxide aqueous solution, stirring for 2 hours, soaking for 36 hours, washing with water until neutral, filtering, and airing for 48 hours to obtain alkaline cellulose;

[0080] 2) Weigh 10 g of the alkaline cellulose obtained in step 1), add 30 g of isopropanol, stir and heat to 55° C., and simultaneously dropwise add 3 g of a 20% sodium hydroxide aqueous solution and 5 g of an 80% trimethylallyl ammonium chloride aqueous solution, respectively, and react for 3 h at this temperature. Wash and drain to obtain a cationic modified cellulose with a quaternary ammonium cationic group.

[0081] 3) Weigh 10g of 85% phosphoric acid aqueous solution and 10g of phosphorus pentoxide, stir and heat to 160°C, keep warm for 2h, after the reaction is completed, transfer the above reactants to a three-necked flask with a stirrer, add 3g of petroleum ether, and dropwise add 20g of a straight-chain alkyl alcohol containing 18 carbon atoms, stir and heat to 85°C, keep warm for 3.5h, after the reaction is completed, add 5g of deionized water to the three-necked flask, and hydrolyze at 60°C for 2h, then add 1g of petroleum ether to the three-necked flask and let stand for 0.5h, separate, reduce pressure, distill, dry and cool to obtain an alkyl phosphate containing 18 carbon atoms;

[0082] 4) nitrogen was introduced into the reaction container for flushing, and then 5 g of deionized water and 20 g of the cationic modified cellulose with quaternary ammonium cationic groups obtained in step 2) were added, the temperature was raised to 60° C. with stirring, and 10 g of the alkyl phosphate with a carbon number of 18 obtained in step 3) and 0.1 g of a 60% aqueous solution of ammonium persulfate were added dropwise respectively for 2.5 h. After the addition was completed, the reaction was kept warm for 1.5 h, and then the reactants were cooled to terminate the reaction;

[0083] 5) adding sodium hydroxide aqueous solution dropwise to the reactant prepared in step 4) while stirring to carry out a neutralization reaction, and adjusting the pH value of the solution to 7 to obtain the desired antibacterial and anti-corrosion agent

[0084] Example 3

[0085] A preparation method of an antibacterial and anti-corrosion agent comprises the following steps:

[0086] 1) Soaking bagasse cellulose in a 20% sodium hydroxide aqueous solution, stirring for 2 hours, soaking for 36 hours, washing with water until neutral, filtering, and airing for 48 hours to obtain alkaline cellulose;

[0087] 2) Weigh 10 g of the alkaline cellulose obtained in step 1), add 30 g of isopropanol, stir and heat to 55° C., and simultaneously dropwise add 3 g of a 20% sodium hydroxide aqueous solution and 5 g of an 80% trimethylallyl ammonium chloride aqueous solution, respectively, and react for 3 h at this temperature. Wash and drain to obtain a cationic modified cellulose with a quaternary ammonium cationic group.

[0088] 3) Weigh 10g of 85% phosphoric acid aqueous solution and 10g of phosphorus pentoxide, stir and heat to 160°C, keep warm for 2h, after the reaction is completed, transfer the above reactants to a three-necked flask with a stirrer, add 3g of petroleum ether, and dropwise add 20g of a straight-chain alkyl alcohol containing 18 carbon atoms, stir and heat to 85°C, keep warm for 3.5h, after the reaction is completed, add 5g of deionized water to the three-necked flask, and hydrolyze at 60°C for 2h, then add 1g of petroleum ether to the three-necked flask and let stand for 0.5h, separate, reduce pressure, distill, dry and cool to obtain an alkyl phosphate containing 18 carbon atoms;

[0089] 4) nitrogen was introduced into the reaction container for flushing, and then 5 g of deionized water and 10 g of the cationic modified cellulose with quaternary ammonium cationic groups obtained in step 2) were added, the temperature was raised to 60° C. with stirring, and 15 g of the alkyl phosphate with a carbon number of 18 obtained in step 3) and 0.1 g of a 60% aqueous solution of ammonium persulfate were added dropwise respectively for 2.5 h. After the addition was completed, the reaction was kept warm for 1.5 h, and then the reactants were cooled to terminate the reaction;

[0090] 5) adding sodium hydroxide aqueous solution dropwise to the reactant prepared in step 4) while stirring to carry out a neutralization reaction, and adjusting the pH value of the solution to 7 to obtain the desired antibacterial and anti-corrosion agent

[0091] Example 4

[0092] A preparation method of bagasse fiber comprises the following steps:

[0093] First, crush the sugarcane bagasse to about 1 cm, then soak it in 10% acetic acid by mass for 36 hours and then dry it. Finally, add the dried material into the blaster, introduce water vapor at a temperature of 110°C to heat the dried material, keep it warm for 30 minutes, then introduce inert gas carbon dioxide to increase the pressure to 100MPa, maintain the pressure for 20 minutes, and then quickly release the pressure. After flash explosion, collection, sorting, washing and drying, the bagasse fiber is obtained.

[0094] Example 5

[0095] A preparation method of bagasse fiber comprises the following steps:

[0096] First, crush the sugarcane bagasse to about 1 cm, then soak it in 10% acetic acid by mass for 36 hours and then dry it. Finally, add the dried material into the blaster, introduce water vapor at a temperature of 150°C to heat the dried material, keep it warm for 30 minutes, then introduce inert gas carbon dioxide to increase the pressure to 100MPa, maintain the pressure for 20 minutes, and then quickly release the pressure. After flash explosion, collection, sorting, washing and drying, the bagasse fiber is obtained.

[0097] Example 6

[0098] A preparation method of bagasse fiber comprises the following steps:

[0099] First, crush the sugarcane bagasse to about 1 cm, then soak it in 20% by mass acetic acid for 36 hours and then dry it. Finally, add the dried material into the blaster, introduce water vapor at a temperature of 110°C to heat the dried material, keep it warm for 30 minutes, then introduce inert gas carbon dioxide to increase the pressure to 100MPa, maintain the pressure for 20 minutes, and then quickly release the pressure. After flash explosion, collection, sorting, washing and drying, the bagasse fiber is obtained.

[0100] Comparative Example 1

[0101] A preparation method of an antibacterial agent comprises the following steps:

[0102] 1) Soaking bagasse cellulose in a 20% sodium hydroxide aqueous solution, stirring for 2 hours, soaking for 36 hours, washing with water until neutral, filtering, and airing for 48 hours to obtain alkaline cellulose;

[0103] 2) Weigh 10 g of the alkaline cellulose obtained in step 1), add 30 g of isopropanol, stir and heat to 55° C., and simultaneously dropwise add 3 g of a 20% aqueous sodium hydroxide solution and 5 g of an 80% aqueous trimethylallyl ammonium chloride solution. Keep the mixture warm for 3 h, wash and drain to obtain a cationic modified cellulose with a quaternary ammonium cationic group.

[0104] Comparative Example 2

[0105] A preparation method of an anti-corrosion agent comprises the following steps:

[0106] Weigh 10g of 85% phosphoric acid aqueous solution and 10g of phosphorus pentoxide, stir and heat to 160°C, keep warm for 2h, after the reaction is completed, transfer the above reactants to a three-necked flask with a stirrer, add 3g of petroleum ether, and add 20g of a straight-chain alkyl alcohol containing 18 carbon atoms dropwise, stir and heat to 85°C, keep warm for 3.5h, after the reaction is completed, add 5g of deionized water to the three-necked flask, and hydrolyze at 60°C for 2h, then add 1g of petroleum ether to the three-necked flask and let stand for 0.5h, separate, reduce pressure, distill, dry and cool to obtain an alkyl phosphate containing 18 carbon atoms.

[0107] Example 7

[0108] A method for preparing crack-resistant, antibacterial and erosion-resistant tunnel lining concrete comprises the following steps:

[0109] 1) 40 parts of bagasse fiber obtained in Example 4, 15 parts of the antibacterial and anti-corrosion agent obtained in Example 1 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0110] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0111] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain crack-resistant, antibacterial and erosion-resistant tunnel lining concrete with a certain fluidity.

[0112] Example 8

[0113] A method for preparing crack-resistant, antibacterial and erosion-resistant tunnel lining concrete comprises the following steps:

[0114] 1) 40 parts of bagasse fiber obtained in Example 4, 15 parts of antibacterial and anti-corrosion agent obtained in Example 2 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0115] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0116] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain crack-resistant, antibacterial and erosion-resistant tunnel lining concrete with a certain fluidity.

[0117] Example 9

[0118] A method for preparing crack-resistant, antibacterial and erosion-resistant tunnel lining concrete comprises the following steps:

[0119] 1) 40 parts of bagasse fiber obtained in Example 4, 15 parts of antibacterial and anti-corrosion agent obtained in Example 3 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0120] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0121] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain crack-resistant, antibacterial and erosion-resistant tunnel lining concrete with a certain fluidity.

[0122] Example 10

[0123] A method for preparing crack-resistant, antibacterial and erosion-resistant tunnel lining concrete comprises the following steps:

[0124] 1) 40 parts of bagasse fiber obtained in Example 5, 15 parts of the antibacterial and anti-corrosion agent obtained in Example 1 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0125] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0126] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain crack-resistant, antibacterial and erosion-resistant tunnel lining concrete with a certain fluidity.

[0127] Embodiment 11

[0128] A method for preparing crack-resistant, antibacterial and erosion-resistant tunnel lining concrete comprises the following steps:

[0129] 1) 40 parts of bagasse fiber obtained in Example 6, 15 parts of the antibacterial and anti-corrosion agent obtained in Example 1 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0130] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0131] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain crack-resistant, antibacterial and erosion-resistant tunnel lining concrete with a certain fluidity.

[0132] Example 12

[0133] A method for preparing crack-resistant, antibacterial and erosion-resistant tunnel lining concrete comprises the following steps:

[0134] 1) 50 parts of bagasse fiber obtained in Example 4, 15 parts of the antibacterial and anti-corrosion agent obtained in Example 1 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0135] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0136] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain crack-resistant, antibacterial and erosion-resistant tunnel lining concrete with a certain fluidity.

[0137] Comparative Example 3

[0138] A method for preparing antibacterial tunnel lining concrete comprises the following steps:

[0139] 1) 15 parts of the antibacterial agent obtained in Comparative Example 1 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0140] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0141] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain antibacterial tunnel lining concrete with a certain fluidity.

[0142] Comparative Example 4

[0143] A method for preparing erosion-resistant tunnel lining concrete comprises the following steps:

[0144] 1) 15 parts of the anti-corrosion agent obtained in Comparative Example 2 and 100 parts of water were added into a blender and mixed to obtain a uniform mixture;

[0145] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0146] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain anti-corrosion tunnel lining concrete with a certain fluidity.

[0147] Comparative Example 5

[0148] A method for preparing crack-resistant tunnel lining concrete comprises the following steps:

[0149] 1) 40 parts of bagasse fiber obtained in Example 4 and 100 parts of water were weighed and added into a blender, and mixed to obtain a uniform mixture;

[0150] 2) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 40 parts of water, 6 parts of admixture and 840 parts of fine aggregate to the mixture obtained in step 1), stirring evenly to obtain a uniformly mixed cement mortar;

[0151] 3) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 2) in sequence, and stir evenly to obtain crack-resistant tunnel lining concrete with a certain fluidity.

[0152] Blank example

[0153] A method for preparing tunnel lining concrete comprises the following steps:

[0154] 1) adding 270 parts of cement, 60 parts of mineral powder, 145 parts of fly ash, 40 parts of silica fume, 140 parts of water, 6 parts of admixture and 840 parts of fine aggregate in sequence, stirring evenly to obtain a uniformly mixed cement mortar;

[0155] 2) Add 910 parts of coarse aggregate and 3 parts of admixture to the cement mortar obtained in step 1) in sequence, and stir evenly to obtain tunnel lining concrete with a certain fluidity.

[0156] The antibacterial properties of the crack-resistant, antibacterial, and anti-corrosion tunnel lining concretes prepared in Examples 7 to 12, Comparative Examples 3 to 5, and the blank example were tested, and the results are shown in Tables 1 and 2.

[0157] Table 1 Antibacterial effect of Examples 7 to 12, Comparative Examples 3 to 5 and Blank Examples on Escherichia coli

[0158] Colony count (CFU / piece) Antibacterial rate (%) Example 7 19855 93.9 Example 8 10850 96.7 Example 9 17785 94.5 Example 10 17822 94.5 Embodiment 11 18959 94.2 Example 12 17556 94.6 Comparative Example 3 25354 92.2 Comparative Example 4 225350 30.7 Comparative Example 5 253800 22.0 Blank example 325300 /

[0159] Table 2 Antibacterial effects of Examples 7 to 12, Comparative Examples 3 to 5 and Blank Examples on Staphylococcus aureus

[0160]

[0161]

[0162] It can be seen from the test results in Table 1 and Table 2 that, compared with the blank example, the addition of antibacterial and anti-corrosion agents and anti-cracking components can reduce the number of colonies and improve the antibacterial rate to varying degrees; among them, on the one hand, compared with Example 7, Example 8 can be seen that with the increase of antibacterial components, the number of colonies on the concrete is significantly reduced, and the antibacterial rate is significantly improved; on the other hand, compared with Example 7, Example 9 and Example 12 can be seen that with the increase of anti-corrosion and anti-cracking components, the number of colonies on the concrete surface is reduced to a certain extent, and the antibacterial rate of the concrete is also improved to a certain extent, which shows that the anti-corrosion component and the anti-cracking component also have a certain promoting effect on antibacterial, and the antibacterial component, the anti-corrosion component and the anti-cracking component synergistically fight bacteria; at the same time, compared with Example 7, Example 10 and Example 11 can be seen that during the treatment of sugarcane bagasse, increasing the steam temperature and the mass fraction of acid can improve the antibacterial properties of concrete to varying degrees.

[0163] The anti-corrosion properties of the crack-resistant, anti-bacterial and anti-corrosion tunnel lining concrete prepared in Examples 7 to 12, Comparative Examples 3 to 5 and the blank example were tested. The results are shown in Table 3.

[0164] Table 3 Anti-corrosion test results of Examples 7 to 12, Comparative Examples 3 to 5 and Blank Examples

[0165]

[0166]

[0167] It can be seen from the test results in Table 3 that, compared with the blank example, the addition of antibacterial and anti-corrosion agents and anti-cracking components will reduce the total pore volume, median pore size, average pore size and porosity to varying degrees; among them, on the one hand, compared with Example 7, Example 9 shows that with the increase of anti-corrosion components, the total pore volume, median pore size, average pore size and porosity of concrete will be significantly reduced; on the other hand, compared with Example 7, Example 8 and Example 12 show that with the increase of antibacterial and anti-cracking components, the total pore volume, median pore size, average pore size and porosity of concrete will be reduced to varying degrees, which shows that the antibacterial and anti-cracking components also have a certain promotion on the anti-corrosion effect, and the antibacterial components, anti-corrosion components and anti-cracking components work together to resist erosion; at the same time, compared with Example 7, Example 10 and Example 11 show that during the treatment of bagasse, increasing the steam temperature and the mass fraction of acid can improve the anti-corrosion performance of concrete to varying degrees.

[0168] The crack resistance of the crack-resistant, antibacterial and anti-corrosion tunnel lining concrete prepared in Examples 7 to 12, Comparative Examples 3 to 5 and the blank example was tested. The results are shown in Table 4.

[0169] Table 4 Crack resistance test results of Examples 7 to 12, Comparative Examples 3 to 5 and Blank Examples

[0170]

[0171] It can be seen from the test results in Table 4 that, compared with the blank example, the addition of antibacterial and anti-corrosion agents and anti-cracking components will prolong the cracking time of concrete to varying degrees, reduce the average crack width and reduce the number of cracks; among them, on the one hand, compared with Example 7, Example 12 can be seen that with the increase of anti-cracking components, the cracking time of concrete is significantly prolonged, and the average crack width and the number of cracks are significantly reduced; on the other hand, compared with Example 7, Example 8 and Example 9 can be seen that with the increase of antibacterial components and anti-corrosion components, the cracking time of concrete is prolonged to varying degrees, and the average crack width and the number of cracks are reduced to varying degrees, which shows that the antibacterial components and anti-corrosion components also have a certain promotion on the anti-cracking effect, and the antibacterial components, anti-corrosion components and anti-cracking components work together to resist cracking; at the same time, compared with Example 7, it can be seen that in the process of sugarcane bagasse treatment, increasing the steam temperature does not improve the anti-cracking performance of concrete very much, while increasing the mass fraction of acid has a significant improvement on the anti-cracking performance of concrete.

[0172] The compressive properties of the crack-resistant, antibacterial and erosion-resistant tunnel lining concretes prepared in Examples 7 to 12, Comparative Examples 3 to 5 and the blank example were tested. The results are shown in Table 5.

[0173] Table 5 Compressive performance test results of Examples 7 to 12, Comparative Examples 3 to 5 and Blank Examples

[0174]

[0175] From the test results in Table 5, it can be seen that compared with the blank case, the addition of antibacterial and anti-corrosion agents and anti-cracking components will increase the compressive strength of concrete at different ages to varying degrees. It can be seen that antibacterial and anti-corrosion agents and anti-cracking components have no adverse effect on the compressive strength of concrete.

[0176] The specific performance test experimental reference standards are as follows:

[0177] The antibacterial effect test refers to the relevant provisions of GB / T28116-2011 "Antibacterial Bone China", and the growth quantity of two kinds of colonies, Escherichia coli and Staphylococcus aureus, on the surface of the concrete blocks prepared in Examples 7 to 12, Comparative Examples 3 to 5 and the blank example is tested to evaluate the antibacterial performance of the concrete.

[0178] The compressive strength test was carried out according to GB / T 50081-2019 “Standard for Test Methods for Physical and Mechanical Properties of Concrete”. The concrete prepared in Examples 7 to 12, Comparative Examples 3 to 5 and the blank example was made into 150 mm × 150 mm × 150 mm cubic specimens, and the compressive strength of each specimen was tested at 3d, 7d and 28d.

[0179] The anti-corrosion test was conducted by mercury intrusion porosimeter. The concrete specimens prepared in Examples 7 to 12, Comparative Examples 3 to 5 and the blank were cured for 60 days. The porosity, average pore size, total pore volume and median pore size of the concrete were obtained by analyzing the mercury intrusion porosimeter data.

[0180] The crack resistance test uses an elliptical test mold with an inner size of 210mm×90mm×45mm and an outer size of 250mm×130mm×45mm. The bottom of the mold is a rectangular high-temperature resistant glass. The concrete prepared in Examples 7 to 12, Comparative Examples 3 to 5 and the blank example is poured into the elliptical test mold. After curing in a 25°C curing room for 24 hours, the device outside the test mold is removed. After curing in the curing room for 1 day, the test piece is immediately moved into a test room with a temperature of 20±2°C and a relative humidity of 60±5%. Connect the wire to the elliptical test frame, apply conductive glue to the prefabricated wire around the ellipse to make it pass. Turn on the instrument and observe the voltage. Record the cracking time, average crack width, number of cracks of the elliptical test piece, and determine the cracking position according to the coordinate position.

[0181] The crack-resistant, antibacterial and erosion-resistant tunnel lining concrete prepared in the embodiment of the present invention not only meets the requirements of mechanical properties and workability, but also further solves the problems of easy cracking, erosion and microbial corrosion existing in traditional tunnel lining concrete, and can provide a new way for the application of tunnel lining concrete.

[0182] The above embodiments are merely examples for the purpose of clearly explaining the embodiments, and are not intended to limit the embodiments. For those skilled in the art, other different forms of changes or modifications may be made based on the above descriptions, and it is not necessary and impossible to list all the embodiments here, so the obvious changes or modifications derived are still within the protection scope of the invention.

Claims

1. A crack-resistant, antibacterial and anti-corrosion tunnel lining concrete, characterized in that: By mass, it includes the following components: in: The admixture is a polycarboxylic acid water reducer; The molecular structure of the antibacterial and anti-corrosion agent is shown in (1): In formula (1), n ​​is a natural number of 14 to 18, cell represents a cellulose molecular chain, and R is One of; The bagasse fiber is prepared by pre-treating bagasse with acetic acid and then sequentially performing heat treatment and flash explosion treatment.

2. The concrete according to claim 1, characterized in that The antibacterial and anti-corrosion agent is prepared by the following method: immersing bagasse cellulose in an alkaline aqueous solution to pre-treat alkaline cellulose, and then obtaining cationic modified cellulose under the simultaneous action of the alkaline aqueous solution and an unsaturated cationic monomer aqueous solution; phosphorus pentoxide and a phosphoric acid aqueous solution are mixed and reacted, and then reacted with an alkyl alcohol to obtain an alkyl phosphate ester; the obtained cationic modified cellulose and the alkyl phosphate ester are mixed and reacted under the action of an initiator, and then alkali is added for neutralization to obtain the antibacterial and anti-corrosion agent.

3. The concrete according to claim 2, characterized in that: When alkaline cellulose reacts under the combined action of alkaline aqueous solution and unsaturated cationic monomer, the mass ratio of alkaline cellulose to alkaline aqueous solution is 1:(0.2-0.4), the mass ratio of alkaline cellulose to unsaturated cationic monomer is 1:(0.4-1); the mass ratio of phosphorus pentoxide, phosphoric acid aqueous solution and alkyl alcohol is (1-3):1:(2-3); the mass ratio of cationic modified cellulose and alkyl phosphate is 1:(0.5-1.5); and the amount of initiator used is 0.5-1% of the mass of the cationic modified cellulose.

4. The concrete according to claim 2, characterized in that The unsaturated cationic monomer is one of trimethylallylammonium chloride, dimethylallylammonium chloride, dimethyldiallylammonium chloride, 2-methacryloyloxyethylammonium chloride, and N,N,N-trimethylvinylbenzyl ammonium chloride; the alkyl alcohol is a straight-chain alkyl alcohol having 14 to 18 carbon atoms; and the initiator is ammonium persulfate.

5. The concrete according to claim 2, characterized in that: The specific steps of the preparation method of the antibacterial and anti-corrosion agent are as follows: 1) Soaking bagasse cellulose in an alkaline aqueous solution, stirring for 1.5 h to 2 h, soaking for 24 h to 36 h, washing with water until neutral, filtering, and airing for 24 h to 48 h to obtain alkaline cellulose; 2) weighing the alkaline cellulose obtained in step 1), adding isopropanol, stirring and heating to 50° C. to 55° C., adding alkaline aqueous solution and unsaturated cationic monomer aqueous solution dropwise at the same time, keeping the temperature for reaction for 2.5 h to 3 h, washing and drying to obtain cationic modified cellulose; 3) Weigh phosphorus pentoxide and phosphoric acid aqueous solution, stir and heat to 160°C to 165°C, keep warm and react for 2h to 2.5h, add petroleum ether after the reaction is complete, and add alkyl alcohol drop by drop, stir and heat to 85°C to 90°C, continue to keep warm and react for 3.5h to 4h, add deionized water after the reaction is complete, and hydrolyze at 60°C to 70°C for 2h to 2.5h, then add petroleum ether and let stand for 0.5h to 1h, separate, reduce pressure, distill, dry and cool to obtain alkyl phosphate; 4) nitrogen is introduced into the reaction container for flushing, and then deionized water and the cationic modified cellulose obtained in step 2) are added, the temperature is raised to 60° C. to 70° C. with stirring, and the alkyl phosphate ester and the initiator aqueous solution obtained in step 3) are added dropwise, respectively, for 2.5 h to 3 h. After the addition is completed, the reaction is kept warm for 1.5 h to 2 h, and then the reactants are cooled to terminate the reaction; 5) adding sodium hydroxide aqueous solution dropwise to the reactant prepared in step 4) to carry out a neutralization reaction, and adjusting the pH value of the solution to 7-8 to obtain the desired antibacterial and anti-corrosion agent.

6. The concrete according to claim 1, characterized in that The specific steps for preparing the bagasse fiber are: firstly crushing the bagasse to 1 cm to 2 cm, then soaking it in acetic acid for 36 hours to 48 hours and then drying it, then heating the dried material with water vapor for heat treatment, keeping the temperature for 30 minutes to 45 minutes, then introducing inert gas to increase the pressure to 100MPa to 150MPa, keeping the pressure for 20 minutes to 25 minutes, then quickly releasing the pressure, flashing and exploding, and obtaining the bagasse fiber through post-treatment.

7. The concrete according to claim 6, characterized in that The mass fraction of acetic acid is 10% to 20%; the water vapor temperature is 110°C to 150°C.

8. The concrete according to claim 1, characterized in that The cement has a strength grade of 42.5 and an apparent density of 3.1 g / cm 3 ~3.2g / cm 3 The fly ash is Class I fly ash with a 0.045mm sieve residue of 6.0% to 6.2% and a water requirement ratio of 92% to 95%; the mineral powder has a density of 2.88g / cm 3 ~2.90g / cm 3 Specific surface area: 443m 2 / kg~450m 2 / kg of S95 grade slag powder; the specific surface area of ​​the silica ash is 22000m 2 / kg~24000m 2 / kg, SiO2 content is 90% to 95%; the fine aggregate has a fineness modulus of 2.5 to 2.7 and an apparent density of 2670kg / cm 3 ~2698kg / m 3 , machine-made sand with a mud content of 0.8% to 1.2%; the coarse aggregate has an apparent density of 2810 kg / cm 3 ~2840kg / cm 3 , continuous graded gravel with crushing value of 7.2% to 8.5% and particle size of 5mm to 16mm; the water reduction rate of polycarboxylic acid water reducer is 25% to 30%.

9. A method for preparing the crack-resistant, antibacterial and erosion-resistant tunnel lining concrete according to claim 1, characterized in that: The following steps are involved: 1) weighing bagasse fiber, antibacterial and anti-corrosion agent and part of water, adding them into a blender, and mixing to obtain a uniform mixture; 2) adding cement, mineral powder, fly ash, silica fume, remaining water, part of admixture and fine aggregate to the mixture obtained in step 1) in sequence, stirring evenly to obtain a uniformly mixed cement mortar; 3) Adding the coarse aggregate and the remaining admixtures to the cement mortar obtained in step 2) in sequence, and stirring evenly, to obtain crack-resistant, antibacterial, and erosion-resistant tunnel lining concrete with a certain fluidity.

10. The preparation method according to claim 9, characterized in that: In the step 1), the amount of water added is 65-75% of the total amount of water; in the step 2), the amount of admixture added is 50-70% of the total amount of admixture.

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