CN115259887B

CN115259887B - High-strength aerated renewable concrete

Info

Publication number: CN115259887B
Application number: CN202210971147.XA
Authority: CN
Inventors: 潘三才
Original assignee: Qidong Haizhonggang Building Material Co ltd
Current assignee: Qidong Haizhonggang Building Material Co ltd
Priority date: 2022-08-11
Filing date: 2022-08-11
Publication date: 2023-05-19
Anticipated expiration: 2042-08-11
Also published as: CN115259887A

Abstract

The application relates to high-strength aerated renewable concrete, and relates to the technical field of concrete. The adhesive comprises the following components in parts by mass: 50-60 parts of cement; 70-90 parts of sand and stone; 120-160 parts of recycled aggregate; 20-30 parts of water; 6-10 parts of water reducer; 7-9 parts of reinforcing auxiliary agent; 1.5-3.5 parts of a gas generating agent; the reinforcing auxiliary agent comprises the following components in parts by mass: 4-5 parts of modified straw fiber; 3-4 parts of modified kaolin. According to the method, the reinforcing auxiliary agent is added into the concrete system, so that the mechanical strength of the concrete is improved, and the phenomenon that the concrete cracks or breaks in the follow-up process can be effectively reduced.

Description

High-strength aerated renewable concrete

Technical Field

The application relates to the field of concrete, in particular to high-strength aerated renewable concrete.

Background

The recycled concrete can also be called as recycled aggregate concrete, the aerated concrete is porous silicate concrete, various physical and mechanical properties of the recycled concrete depend on the concrete structure after autoclaved curing, including the composition of the pore structure and the pore wall, and the recycled concrete and the aerated concrete are combined to prepare the recycled aerated concrete, so that the environment-friendly light concrete can be obtained.

In general, the aerated concrete is prepared by adding an initiator into the concrete to enable the concrete to contain a large number of air holes, so that the mass of the concrete is reduced, and light concrete is obtained, however, because the pore structure of the concrete is difficult to control, the pore structure can be large or small, the phenomenon of uneven internal density of the concrete is generated, and the phenomenon of cracking is easy to occur in the follow-up process.

In view of the above problems, the inventors have recognized that it is necessary to develop an aerated concrete with improved mechanical strength.

Disclosure of Invention

In order to improve the mechanical strength of the aerated recycled concrete, the application provides high-strength aerated recycled concrete.

The application provides a high strength air entrainment renewable concrete adopts following technical scheme:

the high-strength aerated renewable concrete comprises the following components in parts by mass:

50-60 parts of cement, 70-90 parts of sand stone, 120-160 parts of recycled aggregate, 20-30 parts of water, 6-10 parts of water reducer, 7-9 parts of reinforcing auxiliary agent and 1.5-3.5 parts of gas generating agent;

the reinforcing auxiliary agent comprises the following components in parts by mass:

4-5 parts of modified straw fiber and 3-4 parts of modified kaolin.

The reinforcing auxiliary agent is added into the renewable concrete, so that the mechanical property of the renewable concrete can be improved, the reinforcing auxiliary agent consists of modified straw fibers and modified kaolin, the modified straw fibers are plant fibers with high cellulose content and good mechanical property, and after the modified straw fibers are combined with cement, the generation of plant fiber pectin on hydrated calcium silicate can be reduced, so that the mechanical strength of the concrete can be improved; the modified kaolin is added to improve the mechanical property and durability of the concrete, the modified kaolin and the modified straw fiber can cooperatively improve the mechanical property of the concrete, and the modified kaolin has high activity and micro-particle filling effect and can be uniformly dispersed in gaps on the surface of the modified straw fiber, so that the stability of the reinforcing auxiliary agent is improved, and the mechanical property of the whole concrete system is improved.

Preferably, the modified straw fiber comprises the following components: sodium hydroxide, sodium silicate and straw fiber.

The sodium hydroxide is used for soaking and modifying the straw fiber, so that the straw fiber is in an alkaline environment, lignin and part of hemicellulose in the straw fiber are removed, a small amount of fatty substances and carbohydrates are removed, the roughness and porosity of the surface of the straw fiber are improved, the compatibility between the modified straw fiber and a cement base material is improved, a large amount of hydration particles are attached to holes and cement bonding surfaces on the surface of the straw fiber, the biting force of the cement base is improved, the mechanical property of a concrete system is integrally improved, the straw fiber is modified again through sodium silicate, the water absorption rate is reduced, meanwhile, sodium silicate attached to the surface of the straw fiber reacts with carbon dioxide in the air to generate silicic acid gel, after the silicate gel is dried and hardened, the internal structural compactness of the straw fiber is improved, the compactness and corrosion resistance of the surface of the fiber are improved, and the mechanical property of the concrete is improved.

Preferably, the mass ratio of the sodium hydroxide, the sodium silicate and the straw fiber is (0.03-0.07): (0.01-0.03): 1.

The quality ratio of sodium hydroxide, sodium silicate and straw fiber is controlled within the above range, so that the performance of the straw fiber can be effectively improved.

Preferably, the modified straw fiber is prepared by the following method:

soaking straw fibers in a sodium hydroxide aqueous solution with the mass concentration of 4% for 6-8 hours, then cleaning and drying the straw fibers to obtain primary straw fibers, mixing the primary straw fibers with a sodium silicate aqueous solution with the mass concentration of 1% so that the sodium silicate aqueous solution fully coats the primary straw fibers, and drying the primary straw fibers at the temperature of 75-85 ℃ for 22-24 hours to obtain the modified straw fibers.

Preferably, the modified kaolin comprises a polymeric blend, kaolin, maleic anhydride, and an initiator.

After the kaolin is combined with the polymer blend, the modified kaolin is obtained, has high activity and micro-particle filling effect, and can be uniformly dispersed in gaps on the surface of the modified straw fiber, so that the pore structure of the straw fiber is improved, the working performance of the concrete is optimized, maleic anhydride and an initiator are introduced, the interaction between the kaolin and the polymer blend is enhanced, and the mechanical property is synergistically improved.

Preferably, the modified kaolin is prepared by the following method:

mixing the polymer blend with kaolin, drying at 45-55 ℃ for 22-24 hours, mixing the dried polymer blend with kaolin, adding maleic anhydride and an initiator, continuously mixing, and cooling to obtain the modified kaolin.

Preferably, the mass ratio between the maleic anhydride and the initiator is (4.5-5.5): 1.

The property of the kaolin can be improved by controlling the mass ratio of maleic anhydride to the initiator.

Preferably, the polymeric blend comprises polycaprolactone and polylactic acid.

After the polycaprolactone and the polylactic acid are blended, the compatibility of the blend can be improved, and the toughness of the whole modified kaolin can be improved.

Preferably, the initiator is dibenzoyl peroxide.

The maleic anhydride and the dibenzoyl peroxide can jointly improve the dispersion uniformity of the kaolin, so that the stability of the modified kaolin is improved.

Preferably, the gas generating agent is aluminum powder.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the reinforcing agent is added into the concrete system, and consists of modified straw fiber and modified kaolin, so that the mechanical property of the concrete system is improved, the phenomena of cracking and the like of concrete in the follow-up process are reduced, the service life of the concrete is prolonged, the modified straw fiber is a plant fiber with high cellulose content and good mechanical property, and the generation of calcium silicate hydrate by plant fiber pectin can be reduced after the modified straw fiber is combined with cement, so that the mechanical strength of the concrete can be improved; the modified kaolin has high activity and micro-particle filling effect, and can be uniformly dispersed in gaps on the surface of the modified straw fiber, so that the stability of the reinforcing auxiliary agent is improved, and the mechanical property of the whole concrete system is improved;

2. the modified straw fiber consists of sodium hydroxide, sodium silicate and straw fiber, lignin is arranged in the straw fiber, the straw fiber is alkaline after the straw fiber is combined with the sodium hydroxide, the lignin and hemicellulose on the surface of the straw fiber are removed, so that the rough weighing of the surface of the straw fiber is improved, the compatibility with cement is improved, the sodium silicate is used for treating the straw fiber, the sodium silicate attached to the surface of the straw fiber reacts with carbon dioxide to generate silicic acid gel, and after the gel is dried and hardened, the compactness of the straw fiber is improved, and the integral stability of a concrete system is further improved;

3. the modified kaolin has high activity and micro-particle filling effect, and can be uniformly dispersed in gaps on the surface of the modified straw fiber, so that the pore structure of the straw fiber is improved, the working performance of concrete is optimized, maleic anhydride and an initiator are introduced, the interaction between the kaolin and a polymer blend is enhanced, and the mechanical property is synergistically improved.

Detailed Description

The examples herein disclose a high strength aerated renewable concrete, and are described in further detail below in connection with the examples.

Example 1

Preparing modified straw fibers:

3.78kg of straw fiber is soaked in 0.11kg of sodium hydroxide aqueous solution with the mass concentration of 4% for 8 hours, then the straw fiber is cleaned by clean water, put into an oven and dried to obtain primary straw fiber, the primary straw fiber is mixed with 0.11kg of sodium silicate aqueous solution with the mass concentration of 1% so that the sodium silicate solution fully coats the primary straw fiber, and then the primary straw fiber is dried for 24 hours at the temperature of 75 ℃ to obtain the modified straw fiber.

Preparation of modified kaolin:

and (3) uniformly stirring 1.5kg of polycaprolactone and 3.5kg of polylactic acid, adding into an internal mixer for melt blending, setting the rotational speed of the internal mixer at 60rpm/min, mixing at 170 ℃ for 20min, and cooling to room temperature to obtain a polymerization blend.

Mixing the prepared polymer blend with 0.2kg of kaolin, drying the mixture in an oven at 45 ℃ for 24 hours, mixing the dried polymer blend with the kaolin at 170 ℃ and 60rpm/min for 5 minutes, adding 0.1kg of compatibilizer and 0.02kg of initiator, mixing the mixture for 25 minutes, and cooling the mixture to obtain the modified kaolin.

Preparing a reinforcing agent:

4kg of the prepared modified straw fiber and 3kg of modified kaolin are fully stirred and mixed to obtain the reinforcing agent.

Preparing recycled concrete:

and (3) fully stirring and mixing 50kg of cement and 7kg of reinforcing agent, crushing 120kg of recycled aggregate, removing impurities, mixing the recycled aggregate after removing the impurities with the cement, and then adding 70kg of sand and stone, 20kg of water, 6kg of water reducer and 1.5kg of air generating agent, and fully and uniformly stirring to obtain the recycled concrete.

Example 2

Preparing modified straw fibers:

5.56kg of straw fiber is soaked in 0.39kg of sodium hydroxide aqueous solution with the mass concentration of 4% for 6 hours, then the straw fiber is cleaned by clean water, put into an oven and dried to obtain primary straw fiber, the primary straw fiber is mixed with 0.05kg of sodium silicate aqueous solution with the mass concentration of 1% so that the sodium silicate solution fully coats the primary straw fiber, and then the primary straw fiber is dried for 24 hours at the temperature of 75 ℃ to obtain the modified straw fiber.

Preparation of modified kaolin:

2.1kg of polycaprolactone and 4.9kg of polylactic acid are stirred uniformly and then added into an internal mixer for melt blending, the internal mixer is set to mix for 20min at the temperature of 170 ℃ at the rotating speed of 60rpm/min, and the mixture is cooled to room temperature, so that the polymerization blend is obtained.

Mixing the prepared polymer blend with 0.4kg of kaolin, drying the mixture in an oven at 55 ℃ for 22 hours, mixing the dried polymer blend with the kaolin at 170 ℃ and 60rpm/min for 5 minutes, adding 0.3kg of compatibilizer and 0.05kg of initiator, mixing for 25 minutes, and cooling to obtain the modified kaolin.

Preparing a reinforcing agent:

and (3) fully stirring and mixing 6kg of the prepared modified straw fiber and 4kg of modified kaolin to obtain the reinforcing agent.

Preparing recycled concrete:

60kg of cement and 9kg of reinforcing agent are fully stirred and mixed, 160kg of recycled aggregate is crushed, impurities are removed, the recycled aggregate after the impurities are removed is mixed with the cement, 90kg of sand and stone, 30kg of water, 10kg of water reducer and 3.5kg of air generating agent are added, and the mixture is fully and uniformly stirred, so that the recycled concrete can be obtained.

Example 3

Preparing modified straw fibers:

soaking 4.67kg of straw fiber in 0.23kg of sodium hydroxide aqueous solution with the mass concentration of 4% for 6 hours, cleaning the straw fiber by using clear water, putting the cleaned straw fiber into an oven, drying to obtain primary straw fiber, mixing the primary straw fiber with 0.1kg of sodium silicate aqueous solution with the mass concentration of 1% so that the sodium silicate solution fully coats the primary straw fiber, and then drying the primary straw fiber for 24 hours at the temperature of 75 ℃ to obtain the modified straw fiber.

Preparation of modified kaolin:

and (3) uniformly stirring 1.8kg of polycaprolactone and 4.2kg of polylactic acid, adding into an internal mixer for melt blending, setting the rotational speed of the internal mixer at 60rpm/min, mixing at 170 ℃ for 20min, and cooling to room temperature to obtain a polymerization blend.

Mixing the prepared polymer blend with 0.3kg of kaolin, drying the mixture in an oven at 50 ℃ for 23 hours, mixing the dried polymer blend with the kaolin at 170 ℃ and 60rpm/min for 5 minutes, adding 0.2kg of compatibilizer and 0.04kg of initiator, mixing the mixture for 25 minutes, and cooling the mixture to obtain the modified kaolin.

Preparing a reinforcing agent:

and (3) fully stirring and mixing 5kg of the prepared modified straw fiber and 4kg of modified kaolin to obtain the reinforcing agent.

Preparing recycled concrete:

and (3) fully stirring and mixing 55kg of cement and 8kg of reinforcing agent, crushing 140kg of recycled aggregate, removing impurities, mixing the recycled aggregate after removing the impurities with the cement, and then adding 80kg of sand and stone, 25kg of water, 80kg of water reducer and 2.5kg of air generating agent, and fully and uniformly stirring to obtain the recycled concrete.

Example 4

Example 4 based on example 3, the only difference between example 4 and example 3 is: in the case of preparing the modified straw fiber in example 4, 4.85kg of the straw fiber was weighed, 0.05kg of the aqueous sodium hydroxide solution was weighed, and 0.1kg of the aqueous sodium silicate solution was weighed.

Example 5

Example 5 based on example 3, the only difference between example 5 and example 3 is: in the case of preparing the modified straw fiber in example 5, 4.46kg of the straw fiber was weighed, 0.45kg of the aqueous sodium hydroxide solution was weighed, and 0.09kg of the aqueous sodium silicate solution was weighed.

Example 6

Example 6 based on example 3, the only difference between example 6 and example 3 is: in the case of preparing the modified straw fiber in example 6, 4.74kg of the straw fiber was weighed, 0.24kg of the sodium hydroxide aqueous solution was weighed, and 0.02kg of the sodium silicate aqueous solution was weighed.

Example 7

Example 7 based on example 3, the only difference between example 7 and example 3 is: in the case of preparing the modified straw fiber in example 7, 4.42kg of the straw fiber was weighed, 0.22kg of the aqueous sodium hydroxide solution was weighed, and 0.36kg of the aqueous sodium silicate solution was weighed.

Example 8

Example 8 based on example 3, the only difference between example 8 and example 3 is: in the preparation of the modified kaolin of example 8, 0.19kg of maleic anhydride was weighed and 0.05kg of dibenzoyl peroxide was weighed.

Example 9

Example 9 based on example 3, example 9 differs from example 3 only in that: in the preparation of the modified kaolin of example 8, 0.21kg of maleic anhydride and 0.24kg of dibenzoyl peroxide were weighed.

Comparative example 1

Year old ratio 1 based on example 3, the difference between comparative example 1 and example 3 is only that: comparative example 1 the modified straw fiber was replaced with a general straw fiber.

Comparative example 2

Comparative example 2 based on example 3, the only difference between comparative example 2 and example 3 is: comparative example 2 when preparing modified straw fiber, the weighed straw fiber was 4.76kg, the weighed aqueous sodium hydroxide solution was 0.24kg, and the weighed aqueous sodium silicate solution was 0kg.

Comparative example 3

Comparative example 3 based on example 3, the only difference between comparative example 3 and example 3 is that: comparative example 3 when preparing modified straw fiber, the weighed straw fiber was 4.9kg, the weighed aqueous sodium hydroxide solution was 0kg, and the weighed aqueous sodium silicate solution was 0.1kg.

Comparative example 4

Comparative example 4 based on example 3, the only difference between comparative example 4 and example 3 is: comparative example 4 when preparing modified kaolin, 0.54kg of kaolin was weighed, 0kg of maleic anhydride was weighed, and 0kg of dibenzoyl peroxide was weighed.

Performance test

The recycled concrete from examples 1-9, comparative examples 1-3 was sampled and the samples were subjected to mechanical property tests.

Selecting a test method for mechanical properties of GB/T50081-2002 ordinary concrete, taking a test piece of 20cm multiplied by 5cm from the test sample, curing for 28 days, performing crack resistance test and tensile strength performance strength on the test piece, preparing three test pieces for each test piece, testing for 3 times, and taking an average value of test results to fill in a table 1.

TABLE 1

Detection data analysis

As can be seen from Table 1, the compressive strength of examples 1-3 after curing for 28 days is above 26MPa, the number of cracks is below 6, the maximum crack length is below 10mm, and the tensile strength is above 17MPa, so that the regenerated concrete prepared by the method has good compressive property and tensile strength, and the high-strength concrete prepared by the method has good mechanical strength.

As can be seen from table 1, the only difference between example 4 and example 3 is: in the preparation of the modified straw fiber in example 3, the weighed straw fiber was 4.67kg, the aqueous solution of sodium hydroxide was 0.23kg, and the aqueous solution of sodium silicate was 0.1kg; in example 4, when preparing the modified straw fiber, the weighed straw fiber was 4.85kg, the sodium hydroxide aqueous solution was 0.05kg, the sodium silicate aqueous solution was 0.1kg, the compressive strength of example 4 was reduced, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was reduced, probably because the loss rate of the straw fiber was too low after the sodium hydroxide was reduced, the retarding and setting retarding effects of cement were reduced, so that the concrete was subjected to the phenomenon of cement rapid setting during the preparation process, the stability of the concrete was reduced, the brittleness was increased, and in the mechanical property test, the compressive strength and the tensile strength were both reduced, and the number of cracks and the maximum crack length were also increased.

As can be seen from table 1, the only difference between example 5 and example 3 is: when the modified straw fiber is prepared in example 5, the weighed straw fiber is 4.46kg, the sodium hydroxide aqueous solution is 0.45kg, the sodium silicate aqueous solution is 0.9kg, the compressive strength of example 5 is reduced, the number of cracks is increased, the maximum crack length is increased, and the tensile strength is reduced, which is probably because after the proportion of the sodium hydroxide aqueous solution is increased, the concentration of alkali is too high, so that the swelling capacity of alkali liquor in an amorphous area and a cellulose area is increased, the lateral connection in cellulose is weakened due to the breakage of cellulose chains, the cellulose is loose, the content and the strength of cellulose are reduced, the strength of the modified straw fiber is reduced, the mechanical property of a concrete system is reduced, and the mechanical property of example 5 is reduced.

As can be seen from table 1, the only difference between example 6 and example 3 is: when the modified straw fiber was prepared in example 6, the weighed straw fiber was 4.74kg, the aqueous solution of sodium hydroxide was 0.24kg, the aqueous solution of sodium silicate was 0.02kg, the compressive strength of example 6 was decreased, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was decreased, because the sodium silicate coated with the straw fiber was decreased after the ratio of the aqueous solution of sodium silicate was decreased, it was difficult to coat all the straw fiber, the silica gel produced was decreased, and the effect of improving the compactness of the internal structure of the straw fiber was weakened, so that the mechanical strength of the whole raw concrete was decreased.

As can be seen from table 1, the only difference between example 7 and example 3 is: when the modified straw fiber was prepared in example 7, the weighed straw fiber was 4.42kg, the sodium hydroxide aqueous solution was 0.22kg, the sodium silicate aqueous solution was 0.36kg, the compressive strength of example 7 was reduced, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was reduced, because the sodium silicate coated on the surface of the straw fiber was increased after the sodium silicate aqueous solution was excessively contained, so that the uniformity of aggregation and bonding of the modified straw fiber was reduced, the stability of the concrete system was reduced, the mechanical strength of example 7 was reduced, and the crack resistance and tensile strength were both reduced.

As can be seen from table 1, the only difference between example 8 and example 3 is: in the preparation of modified kaolin in example 8, the amount of maleic anhydride weighed was 0.19kg, dibenzoyl peroxide weighed was 0.05kg, the compressive strength of example 8 was reduced, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was reduced, because polycaprolactone was agglomerated and was difficult to uniformly disperse in polylactic acid after the amount of maleic anhydride added was reduced, and at the same time, kaolin was agglomerated and the dispersion state of kaolin was not improved, so that the uniformity of the concrete system was reduced and the stability was difficult to be improved, and cracking was easily occurred during the crack resistance test and tensile property test, so that the mechanical properties of example 8 were reduced.

As can be seen from table 1, the only difference between example 9 and example 3 is: in the preparation of the modified kaolin of example 9, 0.21kg of maleic anhydride was weighed out and 0.03kg of benzoyl peroxide was weighed out. The compressive strength in example 9 was lowered, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was lowered, because excessive dibenzoyl peroxide caused chain scission of the polymers, so that the connection tightness between the polymers was favored to be lowered, and the stability of the whole system was lowered, so that the mechanical properties of the recycled concrete prepared in example 9 were lowered.

As can be seen from table 1, the only difference between comparative example 1 and example 3 is: in comparative example 1, the modified straw fiber was replaced with the normal straw fiber, the compressive strength in comparative example 1 was decreased, the number of cracks was increased, the maximum crack length was increased, and the tensile strength was decreased because the mechanical properties of the unmodified straw fiber and the cement-bonded surface were poor, the compatibility with the cement base material was decreased, and the cement and the straw fiber were easily separated, so that the compressive strength and the tensile strength of the recycled concrete prepared in comparative example 1 were decreased, and the mechanical properties were decreased.

As can be seen from table 1, the only difference between comparative example 2 and example 3 is: when the modified straw fiber was prepared in comparative example 2, the amount of the weighed straw fiber was 4.76kg, the amount of the weighed aqueous sodium hydroxide solution was 0.24kg, and the amount of the weighed aqueous sodium silicate solution was 0kg, and the mechanical properties of comparative example 2 were lowered because the straw fiber was not modified with sodium silicate, the hardness of the straw fiber was lowered, the water absorption rate of the straw fiber was excessively increased, the hydration effect of cement was lowered, the bonding strength between the straw fiber and the cement matrix was lowered, and the compressive properties and tensile strength of comparative example 2 were both lowered, and therefore the mechanical properties of the recycled concrete prepared in comparative example 2 were lowered.

As can be seen from table 1, the only difference between comparative example 3 and example 3 is: in comparative example 3, when preparing the modified straw fiber, the weighed straw fiber was 4.9kg, the weighed aqueous sodium hydroxide solution was 0kg, the weighed aqueous sodium silicate solution was 0.1kg, and the mechanical properties of comparative example 3 were lowered because a large amount of cellulose and lignin were attached to the surface of the straw fiber modified with sodium hydroxide, and more fatty substances and carbohydrates were present, the roughness and porosity of the surface of the straw fiber were lowered, so that the interfacial bonding effect with cement-based materials was reduced, the bonding ability was lowered, and the stability of comparative example 3 was lowered, so that the mechanical properties of the prepared recycled concrete was lowered.

As can be seen from table 1, the only difference between comparative example 4 and example 4 is: comparative example 4 the modified kaolin prepared was 0.54kg of kaolin, 0kg of maleic anhydride was weighed, 0kg of dibenzoyl peroxide was weighed, and both tensile strength and compressive strength of the regenerated concrete prepared in comparative example 4 were lowered because the modified kaolin was not improved by using maleic amide and dibenzoyl peroxide, and the kaolin and polycaprolactone were aggregated in the system, so that the dispersion effect of the kaolin and polycaprolactone in the system was deteriorated, and the stability of the whole system was lowered, and thus both compressive strength and mechanical properties of the regenerated concrete prepared in comparative example 4 were lowered.

The present embodiment is merely illustrative of the present application, and the present application is not limited thereto, and a worker can make various changes and modifications without departing from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of claims.

Claims

1. The utility model provides a high strength air entrainment renewable concrete which characterized in that: comprises the following components in parts by mass:

4-5 parts of modified straw fiber and 3-4 parts of modified kaolin;

the modified straw fibers include, for example, sodium hydroxide, sodium silicate, and straw fibers;

the mass ratio of the sodium hydroxide to the sodium silicate to the straw fiber is (0.03-0.07): (0.01-0.03): 1;

the modified kaolin comprises a polymeric blend, kaolin, maleic anhydride and an initiator;

the polymeric blend comprises polycaprolactone and polylactic acid;

the modified straw fiber is prepared by the following method:

soaking straw fibers in a sodium hydroxide aqueous solution with the mass concentration of 4% for 6-8 hours, then cleaning and drying the straw fibers to obtain primary straw fibers, mixing the primary straw fibers with a sodium silicate aqueous solution with the mass concentration of 1% so that the sodium silicate aqueous solution fully coats the primary straw fibers, and drying the primary straw fibers at the temperature of 75-85 ℃ for 22-24 hours to obtain modified straw fibers;

the method is characterized in that: the modified kaolin is prepared by the following method:

mixing the polymer blend with kaolin, drying at 45-55 ℃ for 22-24 hours, mixing the dried polymer blend with kaolin, adding maleic anhydride and an initiator, continuously mixing, and cooling to obtain modified kaolin;

the mass ratio of the maleic anhydride to the initiator is (4.5-5.5): 1.

2. The high strength aerated renewable concrete of claim 1, wherein: the initiator is dibenzoyl peroxide.

3. The high strength aerated renewable concrete of claim 1, wherein: the air generating agent is aluminum powder.