Fiber-reinforced thermal insulation and crack-resistant concrete and preparation method thereof

Abstract

The present application relates to the field of concrete, and more specifically, it relates to a fiber-reinforced thermal insulation and crack-resistant concrete and a preparation method thereof. A fiber-reinforced thermal insulation and crack-resistant concrete comprises: cement, coarse aggregate, fine aggregate, water, mineral admixtures, expansion agent, water reducer, and modified corn stalks; the modified raw materials of the modified corn stalks include corn stalks, locust bean gum, and vermiculite, and the mass ratio of corn stalks, locust bean gum, and vermiculite is 1: (0.01-0.05): (0.05-0.1). The concrete provided in the present application can overcome the shortcomings of traditional concrete that is easy to crack and has poor thermal insulation, and can also significantly improve the overall performance of concrete, reduce building energy consumption, and improve the safety and durability of buildings. At the same time, its preparation method is relatively simple and cost-controllable, which is conducive to promotion and application in the construction industry and promotes the sustainable development of the construction industry.

Description

Technical Field

[0001] The present application relates to the field of concrete, and more specifically, to a fiber-reinforced thermal insulation and crack-resistant concrete and a preparation method thereof. Background Art

[0002] Traditional concrete materials often show shortcomings such as insufficient tensile strength, poor toughness, easy cracking and poor thermal insulation performance when dealing with complex and changing engineering environments. These problems are particularly prominent in special projects such as high-rise buildings, long-span bridges, and buildings in cold regions, which have a significant impact on the safety, service life and energy consumption of buildings. In recent years, with the rapid development of the construction industry and the continuous improvement of engineering quality requirements, the research and application of high-performance concrete materials have received increasing attention.

[0003] Since concrete itself has low tensile strength, it is easy to crack when affected by external factors such as temperature changes, loads or foundation settlement. Cracks not only affect the aesthetics of the building, but more importantly, they weaken the overall strength of the structure, accelerate the corrosion of steel bars, and threaten the safety of the building. Especially when the external ambient temperature changes, the internal temperature of the concrete will change rapidly, causing the concrete to expand and contract due to heat and cold, aggravating deformation and cracking.

[0004] Therefore, it is extremely necessary to prepare a fiber-reinforced thermal insulation and crack-resistant concrete. Summary of the invention

[0005] In order to solve the above problems, the present application provides a fiber-reinforced thermal insulation and crack-resistant concrete and a preparation method thereof. The concrete provided in the present application can overcome the shortcomings of traditional concrete that is easy to crack and has poor thermal insulation, and can also significantly improve the overall performance of concrete, reduce building energy consumption, and improve the safety and durability of buildings. At the same time, its preparation method is relatively simple and cost-controllable, which is conducive to promotion and application in the construction industry and promotes the sustainable development of the construction industry.

[0006] In a first aspect, the present application provides a fiber-reinforced thermal insulation and crack-resistant concrete, which adopts the following technical scheme: a fiber-reinforced thermal insulation and crack-resistant concrete, comprising the following raw materials in parts by mass: 250-270 parts of cement, 1000-1100 parts of coarse aggregate, 750-850 parts of fine aggregate, 150-160 parts of water, 50-100 parts of mineral admixture, 20-30 parts of expansion agent, 1-10 parts of water reducer, and 10-20 parts of modified corn stalks;

[0007] The modified raw materials of the modified corn stalks at least include corn stalks, locust bean gum and vermiculite. The mass ratio of corn stalks, locust bean gum and vermiculite is 1:(0.01-0.05):(0.05-0.1), with the mass of corn stalks as the basis.

[0008] By adopting the above technical scheme, locust bean gum and vermiculite are used to modify corn stalks. After the locust bean gum is combined with vermiculite and corn stalks, the bonding effect thereof can ensure the stable distribution of vermiculite and corn stalks in concrete, prevent them from falling off or moving, thereby further improving the crack resistance of concrete.

[0009] Vermiculite is a layered silicate mineral with good thermal insulation properties. When vermiculite is attached to the surface of corn stalks and forms a stable film through locust bean gum, its layered structure can effectively prevent heat conduction, thereby giving concrete good thermal insulation properties, reducing heat exchange between the interior of the concrete and the external environment, and reducing the impact of temperature on the concrete structure.

[0010] Although corn stalks themselves are not special insulation materials, their porosity and certain thermal resistance can also help vermiculite improve the insulation effect to a certain extent. The addition of corn stalks can also increase the porosity of concrete. These pores can store some air and further reduce the convection loss of heat. The cellulose and other components in corn stalks have certain strength and toughness, and can also form a fiber-reinforced effect in concrete. These fibers can restrain the crack expansion of concrete and improve the tensile strength and toughness of concrete. Especially when concrete is subjected to external forces, corn stalk fibers can absorb part of the energy and disperse stress, reducing the generation and development of cracks. In addition, because vermiculite is firmly attached to corn stalks, the roughness of the surface of the modified corn stalks is increased, so that the concrete can better bite with the surface of the corn stalks during the hardening process, forming a tighter interface bond, thereby reducing the generation of cracks and improving strength.

[0011] By combining vermiculite, corn stalks and locust bean gum to form modified corn stalks and applying them to concrete, the overall structural stability of concrete can be significantly improved. This stability is not only reflected in thermal insulation and crack resistance, but also can improve the durability and bearing capacity of concrete.

[0012] Preferably, the mass ratio of the corn stalks, locust bean gum and vermiculite is 1:(0.03-0.05):(0.08-0.1), with the mass of the corn stalks as the basis.

[0013] By adopting the above technical scheme, the mass ratio of corn straw, locust bean gum and vermiculite is further limited, so that as much vermiculite as possible is firmly attached to the corn straw, the roughness of the surface of the modified corn straw is increased, and the modified corn straw has higher crack resistance and thermal insulation effect in the concrete system.

[0014] Preferably, the coarse aggregate is granite with a diameter of 5-25 mm.

[0015] In a second aspect, the present application provides a method for preparing fiber-reinforced thermal insulation and crack-resistant concrete, which adopts the following technical solution:

[0016] A method for preparing fiber-reinforced thermal insulation and crack-resistant concrete comprises the following steps:

[0017] Step 1: Preparation of modified corn stover:

[0018] Step 1a: pre-treating corn stalks, including washing and cutting the corn stalks to obtain pre-treated corn stalks;

[0019] Step 1b: using an alkaline solution to soak the pretreated corn stalks, and taking them out to obtain alkaline soaked corn stalks;

[0020] Step 1c: Mix locust bean gum with water, stir until uniform, mix with vermiculite and alkali-soaked corn stalks, and then soak, and take out to obtain modified corn stalks;

[0021] Step 2: Mix water and cement until uniform to obtain a first mixture;

[0022] Step 3: Mixing the fine aggregate, the mineral admixture and the first mixture until uniform, to obtain a second mixture;

[0023] Step 4: Mix the coarse aggregate, the expansion agent, the water reducing agent, the modified corn stalks and the second mixture until they are uniform, so as to obtain fiber-reinforced thermal insulation and crack-resistant concrete.

[0024] By adopting the above technical scheme, when preparing modified corn stalks, vermiculite and alkaline corn stalks are soaked in a solution containing locust bean gum, the vermiculite is attached to the alkaline corn stalks, and then the locust bean gum also enters the alkaline corn stalks. The modified corn stalks are taken out and subjected to drying and other treatments, so that the vermiculite and locust bean gum are firmly attached to the modified corn stalk structure and are not easy to fall off, forming a whole.

[0025] Preferably, the mass ratio of the water used in step 1c to the total mass of the alkaline-soaked corn straw, locust bean gum and vermiculite is (0.8-1.2):1.

[0026] Preferably, in step 1c, high-speed stirring is performed at 1500-2000 r / min for 15-30 min.

[0027] By adopting the above technical solution, under specific rotation speed and soaking conditions, vermiculite can be more fully attached to the alkaline-soaked corn stalks, which facilitates a series of subsequent coordination.

[0028] Preferably, in step 1c, the mixture is mixed and then soaked for 45-75 minutes.

[0029] Preferably, in step 1b, the corn stalks are pretreated by soaking in a 1-5% sodium hydroxide solution for 2-4 hours, and then the corn stalks are taken out to obtain alkaline-soaked corn stalks.

[0030] By adopting the above technical scheme, the type, concentration and soaking time of the alkaline solution are further limited, the structure of the pretreated corn stalks is properly treated, part of the impurities are removed, and the structural form of the pretreated corn stalks is changed, providing a good basis for the combination with vermiculite and locust bean gum.

[0031] In summary, this application has the following beneficial effects:

[0032] 1. Corn stalks are modified by locust bean gum and vermiculite. After locust bean gum is combined with vermiculite and corn stalks, the stable distribution of vermiculite and corn stalks in concrete can be ensured to prevent them from falling off or moving. When applied to concrete, the bite relationship with concrete is increased and the strength is improved, so that the crack expansion can be more effectively restrained and the crack resistance of concrete can be improved.

[0033] 2. The special structure of modified corn straw can effectively prevent the conduction of heat, reduce the heat exchange between the inside of the concrete and the external environment, and reduce the impact of temperature on the concrete structure. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the embodiments.

[0035] The raw materials used in the following examples and comparative examples are all commercially available products.

[0036] Example

[0037] Example 1

[0038] A fiber-reinforced heat-insulating crack-resistant concrete comprises the following raw materials: cement, coarse aggregate, fine aggregate, water, mineral admixture, expansion agent, water reducing agent and modified corn stalks.

[0039] The specific amounts of various raw materials are shown in Table 1.

[0040] The cement was P.0 42.5R, commercially available.

[0041] The coarse aggregate is 5-25 mm granite, commercially available.

[0042] The fine aggregate was river sand of grading zone II, commercially available.

[0043] The mineral admixture includes mineral powder, grade S95, which is commercially available.

[0044] The expansion agent is a commercially available HEA type anti-cracking expansion agent.

[0045] The water reducer is a commercially available naphthalene-based high-efficiency water reducer (slow-setting type).

[0046] The modified raw materials of the modified corn straw include corn straw, locust bean gum and vermiculite, and the mass ratio of the corn straw, locust bean gum and vermiculite is 1:0.03:0.08.

[0047] The present application also provides a method for preparing fiber-reinforced thermal insulation and crack-resistant concrete, comprising the following steps:

[0048] Step 1: Preparation of modified corn stover:

[0049] Step 1a: Corn stover pretreatment:

[0050] The corn stalks were cut, washed with clean water, dried, crushed and sieved (40 mm) to obtain pretreated corn stalks.

[0051] Step 1b: Use 3% sodium hydroxide solution to soak the pretreated corn stalks for 3 hours, and the mass ratio of the pretreated corn stalks to the sodium hydroxide solution is 1:1.

[0052] After being taken out, the corn stalks are dried to a constant weight to obtain alkaline-soaked corn stalks.

[0053] Step 1c: Prepare water in a 1:1 ratio of the mass of water to the total mass of alkaline-soaked corn stover, locust bean gum, and vermiculite.

[0054] Combine locust bean gum and water and stir until smooth.

[0055] Then add vermiculite and alkaline-soaked corn straw, and mix them under high-speed stirring at 1800 r / min for 20 minutes.

[0056] Then, the mixture was allowed to stand and soak for 60 minutes, taken out, and dried to a constant weight to obtain modified corn stalks.

[0057] Step 2: Mix water and cement and stir until uniform to obtain a first mixture.

[0058] Step 3: Add fine aggregate and mineral admixture into the first mixture and mix until uniform to obtain a second mixture.

[0059] Step 4: Add coarse aggregate, expansion agent, water reducing agent and modified corn stalks into the second mixture and mix until uniform to obtain fiber-reinforced thermal insulation and crack-resistant concrete.

[0060] Example 2

[0061] A fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that it includes the following raw materials: cement, coarse aggregate, fine aggregate, water, mineral admixture, expansion agent, water reducing agent, and modified corn stalks.

[0062] The specific amounts of various raw materials are shown in Table 1.

[0063] The cement was P.0 42.5R, commercially available.

[0064] The coarse aggregate is 5-25 mm granite, commercially available.

[0065] The fine aggregate was river sand of grading zone II, commercially available.

[0066] The mineral admixture includes mineral powder, grade S95, which is commercially available.

[0067] The expansion agent is a commercially available HEA type anti-cracking expansion agent.

[0068] The water reducer is a commercially available naphthalene-based high-efficiency water reducer (slow-setting type).

[0069] The modified raw materials of the modified corn straw include corn straw, locust bean gum and vermiculite, and the mass ratio of the corn straw, locust bean gum and vermiculite is 1:0.05:0.1.

[0070] A method for preparing fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that step 1: preparing modified corn stalks:

[0071] Step 1a: Corn stover pretreatment:

[0072] The corn stalks were cut, washed with clean water, dried, crushed and sieved (40 mm) to obtain pretreated corn stalks.

[0073] Step 1b: Use 5% sodium hydroxide solution to soak the pretreated corn stalks for 2 hours, and the mass ratio of the pretreated corn stalks to the sodium hydroxide solution is 1:1.

[0074] After being taken out, the corn stalks are dried to a constant weight to obtain alkaline-soaked corn stalks.

[0075] Step 1c: Prepare water in a ratio of 1.2:1 to the total mass of alkaline-soaked corn stover, locust bean gum, and vermiculite.

[0076] Combine locust bean gum and water and stir until smooth.

[0077] Then add vermiculite and alkaline-soaked corn straw, and mix them at a high speed of 2000 r / min for 15 minutes.

[0078] Then, the mixture was allowed to stand and soak for 45 minutes, taken out, and dried to a constant weight to obtain modified corn stalks.

[0079] Step 2: Mix water and cement and stir until uniform to obtain a first mixture.

[0080] Step 3: Add fine aggregate and mineral admixture into the first mixture and mix until uniform to obtain a second mixture.

[0081] Step 4: Add coarse aggregate, expansion agent, water reducing agent and modified corn stalks into the second mixture and mix until uniform to obtain fiber-reinforced thermal insulation and crack-resistant concrete.

[0082] Example 3

[0083] A fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that it includes the following raw materials: cement, coarse aggregate, fine aggregate, water, mineral admixture, expansion agent, water reducing agent, and modified corn stalks.

[0084] The specific amounts of various raw materials are shown in Table 1.

[0085] The cement was P.0 42.5R, commercially available.

[0086] The coarse aggregate is 5-25 mm granite, commercially available.

[0087] The fine aggregate was river sand of grading zone II, commercially available.

[0088] The mineral admixture includes mineral powder, grade S95, which is commercially available.

[0089] The expansion agent is a commercially available HEA type anti-cracking expansion agent.

[0090] The water reducer is a commercially available naphthalene-based high-efficiency water reducer (slow-setting type).

[0091] The modified raw materials of the modified corn straw include corn straw, locust bean gum and vermiculite, and the mass ratio of the corn straw, locust bean gum and vermiculite is 1:0.01:0.05.

[0092] A method for preparing fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that step 1: preparing modified corn stalks:

[0093] Step 1a: Corn stover pretreatment:

[0094] The corn stalks were cut, washed with clean water, dried, crushed and sieved (40 mm) to obtain pretreated corn stalks.

[0095] Step 1b: Use 1% sodium hydroxide solution to soak the pretreated corn stalks for 4 hours, and the mass ratio of the pretreated corn stalks to the sodium hydroxide solution is 1:1.

[0096] After being taken out, the corn stalks are dried to a constant weight to obtain alkaline-soaked corn stalks.

[0097] Step 1c: Prepare water according to the total mass ratio of water to alkaline-soaked corn stover, locust bean gum, and vermiculite of 0.8:1.

[0098] Combine locust bean gum and water and stir until smooth.

[0099] Then add vermiculite and alkaline corn straw, and mix them at a high speed of 1500r / min for 30min.

[0100] Then, the mixture was allowed to stand and soak for 75 minutes, and then taken out and dried to a constant weight to obtain modified corn stalks.

[0101] Step 2: Mix water and cement and stir until uniform to obtain a first mixture.

[0102] Step 3: Add fine aggregate and mineral admixture into the first mixture and mix until uniform to obtain a second mixture.

[0103] Step 4: Add coarse aggregate, expansion agent, water reducing agent and modified corn stalks into the second mixture and mix until uniform to obtain fiber-reinforced thermal insulation and crack-resistant concrete.

[0104] Table 1

[0105]

[0106]

[0107] Example 4

[0108] A fiber-reinforced thermal insulation and crack-resistant concrete, the raw materials used are the same as those in Example 1, which will not be repeated here.

[0109] A method for preparing fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that step 1: preparing modified corn stalks:

[0110] Step 1a: Corn stover pretreatment:

[0111] The corn stalks were cut, washed with clean water, dried, crushed and sieved (40 mm) to obtain pretreated corn stalks.

[0112] Step 1b: Use 3% sodium hydroxide solution to soak the pretreated corn stalks for 3 hours, and the mass ratio of the pretreated corn stalks to the sodium hydroxide solution is 1:1.

[0113] After being taken out, the corn stalks are dried to a constant weight to obtain alkaline-soaked corn stalks.

[0114] Step 1c: Prepare water in a 1:1 ratio of the mass of water to the total mass of alkaline-soaked corn stover, locust bean gum, and vermiculite.

[0115] Combine locust bean gum and water and stir until smooth.

[0116] Then add vermiculite and alkaline-soaked corn straw, and mix them at a high speed of 1000 r / min for 20 minutes.

[0117] Then, the mixture was allowed to stand and soak, and then taken out and dried to a constant weight to obtain modified corn stalks.

[0118] Step 2: Mix water and cement and stir until uniform to obtain a first mixture.

[0119] Step 3: Add fine aggregate and mineral admixture into the first mixture and mix until uniform to obtain a second mixture.

[0120] Step 4: Add coarse aggregate, expansion agent, water reducing agent and modified corn stalks into the second mixture and mix until uniform to obtain fiber-reinforced thermal insulation and crack-resistant concrete.

[0121] Comparative Example

[0122] Comparative Example 1

[0123] A fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that locust bean gum is replaced by xanthan gum.

[0124] Comparative Example 2

[0125] A fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that the vermiculite is replaced by expanded perlite.

[0126] Comparative Example 3

[0127] A fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that the mass ratio of corn stalks, locust bean gum and vermiculite is 1:0.08:0.03.

[0128] Comparative Example 4

[0129] A method for preparing fiber-reinforced thermal insulation and crack-resistant concrete, which is different from Example 1 in that step 1: preparing modified corn stalks:

[0130] Step 1a: Corn stover pretreatment:

[0131] The corn stalks were cut, washed with clean water, dried, crushed and sieved (40 mm) to obtain pretreated corn stalks.

[0132] Step 1b: Use 3% sodium hydroxide solution to soak the pretreated corn stalks for 3 hours, and the mass ratio of the pretreated corn stalks to the sodium hydroxide solution is 1:1.

[0133] After being taken out, the corn stalks were dried to a constant weight to obtain modified corn stalks.

[0134] Step 2: Mix water and cement and stir until uniform to obtain a first mixture.

[0135] Step 3: Add fine aggregate and mineral admixture into the first mixture and mix until uniform to obtain a second mixture.

[0136] Step 4: Add coarse aggregate, expansion agent, water reducing agent and modified corn stalks into the second mixture and mix until uniform to obtain fiber-reinforced thermal insulation and crack-resistant concrete.

[0137] Performance testing

[0138] 1. Crack resistance: The 28d splitting tensile strength of the fiber reinforced thermal insulation crack resistant concrete of Examples 1-4 and Comparative Examples 1-4 was tested with reference to GB / T 50081-2002 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete", and the results were recorded in Table 2.

[0139] 2. Compressive strength: The 28d compressive strength of the fiber reinforced thermal insulation and crack resistant concrete of Examples 1-4 and Comparative Examples 1-4 was tested with reference to GB / T 50081-2002 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete", and the results were recorded in Table 2.

[0140] 3. Thermal insulation performance: The thermal conductivity of fiber reinforced thermal insulation and crack resistant concrete of Examples 1-4 and Comparative Examples 1-4 was tested with reference to GB / T 10294-2008 “Determination of Steady-State Thermal Resistance and Related Properties of Insulating Materials - Guarded Hot Plate Method”, and the results were recorded in Table 2.

[0141] Table 2

[0142]

[0143]

[0144] Comparative Example 4 is based on Example 1, and uses modified corn fiber without locust bean gum and vermiculite. According to the test data in Table 2, the fiber-reinforced thermal insulation and crack-resistant concrete of Examples 1-4 has better performance in crack resistance, compression resistance and thermal insulation than Comparative Example 4, and the performance is significantly improved. It shows that the modified corn stalks obtained by modifying corn stalks with locust bean gum and vermiculite can be used in concrete, which can effectively improve the relevant properties of concrete.

[0145] Comparative Examples 1-2 are based on Example 1, and locust bean gum and vermiculite are replaced with other raw materials; Comparative Example 3 is based on Example 1, and the special dosage relationship between locust bean gum, vermiculite and corn stalks is destroyed. According to the test data in Table 2, the fiber-reinforced thermal insulation and crack-resistant concrete of Comparative Examples 1-3 has different degrees of decline in crack resistance, tensile strength and thermal insulation performance, and none of them can achieve the significant effect of Example 1. It shows that the special combination of locust bean gum, vermiculite and corn stalks cannot be arbitrarily changed or split.

[0146] In Example 4, the stirring conditions of locust bean gum, vermiculite and alkali-soaked corn stalks are changed on the basis of Example 1, so that the coordination between the three cannot be maximized, resulting in the inability to improve the performance to the optimal level. It can also be seen from the data in Table 2 that the performance of the fiber-reinforced thermal insulation and crack-resistant concrete in Example 4 is lower than that in Example 1.

[0147] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A fiber-reinforced thermal insulation and crack-resistant concrete, characterized in that: According to the mass proportion, the raw materials include: 250-270 parts of cement, 1000-1100 parts of coarse aggregate, 750-850 parts of fine aggregate, 150-160 parts of water, 50-100 parts of mineral admixture, 20-30 parts of expansion agent, 1-10 parts of water reducing agent, and 10-20 parts of modified corn straw; The modified raw materials of the modified corn straw at least include corn straw, locust bean gum and vermiculite. The mass ratio of corn straw, locust bean gum and vermiculite is 1: (0.01-0.05): (0.05-0.1), with the mass of corn straw as the basis.

2. The fiber-reinforced thermal insulation and crack-resistant concrete according to claim 1, characterized in that: The mass ratio of the corn stalks, locust bean gum and vermiculite is 1:(0.03-0.05):(0.08-0.1), with the mass of the corn stalks as the basis.

3. The fiber-reinforced thermal insulation and crack-resistant concrete according to claim 1, characterized in that: The coarse aggregate is 5-25 mm granite.

4. A method for preparing the fiber-reinforced thermal insulation and crack-resistant concrete according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Preparation of modified corn stover: Step 1a: pre-treating corn stalks, including washing and cutting the corn stalks to obtain pre-treated corn stalks; Step 1b: using an alkaline solution to soak the pretreated corn stalks, and taking them out to obtain alkaline soaked corn stalks; Step 1c: Mix locust bean gum with water, stir until uniform, mix with vermiculite and alkali-soaked corn stalks, and then soak, and take out to obtain modified corn stalks; Step 2: Mix water and cement until uniform to obtain a first mixture; Step 3: Mixing the fine aggregate, the mineral admixture and the first mixture until uniform, to obtain a second mixture; Step 4: Mix the coarse aggregate, the expansion agent, the water reducing agent, the modified corn stalks and the second mixture until they are uniform, so as to obtain fiber-reinforced thermal insulation and crack-resistant concrete.

5. The method for preparing fiber-reinforced thermal insulation and crack-resistant concrete according to claim 4, characterized in that: The mass ratio of the water used in step 1c to the total mass of the alkaline-soaked corn straw, locust bean gum and vermiculite is (0.8-1.2):

1.

6. The method for preparing fiber-reinforced thermal insulation and crack-resistant concrete according to claim 4, characterized in that: In the step 1c, high-speed stirring is performed at 1500-2000 r / min for 15-30 min.

7. The method for preparing fiber-reinforced thermal insulation and crack-resistant concrete according to claim 4, characterized in that: In the step 1c, the mixture is mixed and then soaked for 45-75 minutes.

8. The method for preparing fiber-reinforced thermal insulation and crack-resistant concrete according to claim 4, characterized in that: In the step 1b, corn stalks are pretreated by soaking in a 1-5% sodium hydroxide solution for 2-4 hours, and then the corn stalks are taken out to obtain alkaline-soaked corn stalks.

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