CN114349429B - Lightweight concrete - Google Patents
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Abstract
The application relates to the field of building materials, and particularly discloses lightweight concrete. The lightweight concrete comprises the following raw materials in parts by weight: 350-420 parts of cement, 450-600 parts of multi-layer lightweight aggregate, 200-300 parts of fine aggregate, 300-500 parts of coarse aggregate, 18-23 parts of admixture and 160-175 parts of water; the fibrous multi-layer lightweight aggregate is a composite material which takes aramid fiber as a core material, takes a polydopamine layer as a secondary outer layer and takes an amino silicone oil modified silicon dioxide particle layer as an outermost layer; the multilayer lightweight aggregate adopted in the application can endow concrete with better construction performance, keeps excellent toughening property in the hydration reaction process, overcomes the defect that the traditional lightweight aggregate is easy to float, and optimizes the internal structure of the lightweight concrete, so that the lightweight concrete has excellent compressive strength, flexural strength and lower water absorption.
Description
Technical Field
The application relates to the field of building materials, in particular to lightweight concrete.
Background
In recent years, the development of light concrete is promoted by the development of fabricated houses, and compared with the traditional cement concrete, the light concrete has the characteristic of light dead weight and is convenient to construct and assemble quickly. Lightweight concrete is mainly classified into porous concrete and lightweight aggregate concrete.
The lightweight aggregate concrete reduces the self weight of the concrete by using lightweight aggregate, and the lightweight aggregate has more types, and in the related technology, the following types are commonly used: pumice, ceramsite, expanded slag, plastic and the like. The addition of lightweight aggregates brings new problems: firstly, as a plurality of pores exist in the lightweight aggregate, the interface strength between the lightweight aggregate and the cement slurry is increased, so that the brittleness of the concrete is increased, and the flexural strength of the concrete is reduced; secondly, the strength of the lightweight aggregate itself is lower than that of conventional aggregates such as crushed stone, which results in a decrease in the compressive strength of concrete. Therefore, the difficulty of improving the compressive strength and the flexural strength is greatly increased for lightweight concrete.
In related researches, in order to improve the fracture resistance of lightweight concrete, steel fibers are added to toughen the lightweight concrete, but the improvement effect is poor. The density of the steel fiber is high, so that the self weight of the lightweight concrete is influenced; meanwhile, the lightweight aggregate has small density, is easy to float upwards, and has poor dispersing ability for steel fibers with higher density.
Therefore, it is highly desirable to develop a lightweight concrete, which has higher compressive strength and flexural strength.
Disclosure of Invention
In order to solve the problem that compressive strength and rupture strength of lightweight concrete are low, the application provides a lightweight concrete.
The application provides a lightweight concrete, adopts following technical scheme:
the lightweight concrete comprises the following raw materials in parts by weight:
the fibrous multi-layer lightweight aggregate is a composite material which takes aramid fibers as core materials, takes a polydopamine layer as a secondary outer layer and takes an amino silicone oil modified silicon dioxide particle layer as an outermost layer.
By adopting the technical scheme, dopamine has high adhesiveness, is self-polymerized in a weak alkaline environment to form polydopamine, and can be directly coated on the surface of aramid fiber, so that the surface of the aramid fiber is provided with a plurality of active groups, and the surface activity of the aramid fiber is improved; the amino silicone oil modified silica particles and the polydopamine layer can be grafted through Schiff base reaction and uniformly distributed on the surface of the dopamine-modified aramid fiber to form a plurality of layers of light aggregate; the surface of the multi-layer lightweight aggregate contains amino and hydroxyl of a polydopamine layer, so that the multi-layer lightweight aggregate has good hydrophilicity and workability, and is easy to stir and disperse;
in the hydration reaction process, the strong alkaline environment in the lightweight concrete destroys the polydopamine layer of the multilayer lightweight aggregate, and the polydopamine layer is used as a protective layer to reduce the possibility of degradation of aramid fibers coated inside, so that the aramid fibers with the polydopamine layer attached to the surface can play a better toughening and reinforcing role, and the interface compatibility between the aramid fibers and mortar is better, and the aramid fibers and the mortar are uniformly dispersed in the mortar;
meanwhile, as the poly-dopamine layer is degraded, the amino silicone oil modified silica particles can be gradually separated from the surface of the aramid fiber along with the progress of hydration reaction and uniformly dispersed in the mortar, so that the defect that the traditional light aggregate such as silica is easy to float upwards in the processing process due to low density is overcome, and the 28d compressive strength of the light concrete is further improved;
therefore, the multilayer lightweight aggregate has good interface compatibility with mortar in the hydration reaction process, can be uniformly and stably dispersed in the mortar, and the prepared lightweight concrete has excellent compressive strength and flexural strength;
in addition, in the storage process of the multilayer lightweight aggregate, the aramid fiber is coated by the amino silicone oil modified silicon dioxide particles at the outermost layer, the amino silicone oil modified silicon dioxide particles can effectively absorb ultraviolet light, the possibility of degradation of the aramid fiber in the multilayer lightweight aggregate is reduced, and the storage performance of the multilayer lightweight aggregate is stable.
Optionally, the specific preparation steps of the multilayer lightweight aggregate are as follows:
preparation of amino silicone oil modified silica particles: uniformly mixing tetraethoxysilane and amino silicone oil according to the weight ratio of 1 (0.15-0.25), adding a catalyst, ethanol and water, heating to 75-80 ℃, carrying out heat preservation reaction for 6-10 hours, and carrying out vacuum drying after the reaction is finished to obtain amino silicone oil modified silicon dioxide particles;
preparing polydopamine modified aramid fiber: preparing a trihydroxymethylaminomethane-hydrochloric acid buffer solution with the pH of 8.5, adding dopamine hydrochloride into the trihydroxymethylaminomethane-hydrochloric acid buffer solution, and preparing a dopamine solution with the concentration of 2-4 g/L; adding aramid fiber into a dopamine solution at the temperature of 20-25 ℃, wherein the weight ratio of the aramid fiber to dopamine is 1 (0.021-0.03), keeping the temperature, stirring and reacting for 24-48 h, and washing and drying to obtain polydopamine modified aramid fiber;
preparation of multilayer lightweight aggregate: preparing a trihydroxymethylaminomethane-hydrochloric acid buffer solution with the pH value of 8.5, adding amino silicone oil modified silica particles and polydopamine modified aramid fibers into the trihydroxymethylaminomethane-hydrochloric acid buffer solution, wherein the weight ratio of the amino silicone oil modified silica particles to the polydopamine modified aramid fibers is (0.05-0.15): 1, reacting at the temperature of 25-50 ℃ for 8-24 hours, washing and drying to obtain the multilayer light aggregate.
By adopting the technical scheme, the size of the amino silicone oil modified silica particles is maintained at a nanometer level, and the active groups such as amino groups and hydroxyl groups on the surface of the obtained multilayer lightweight aggregate have moderate content, so that the multilayer lightweight aggregate can be fully dispersed in concrete mortar, and the influence on the water absorption of subsequent lightweight concrete is small.
Preferably, the nitrogen content in the amino silicone oil is 0.4wt% to 0.6 wt%.
By optimizing the amino content in the amino silicone oil, the amino content of the surface of the amino silicone oil modified silicon dioxide is moderate, and the water absorption of the prepared lightweight concrete is further reduced while the excellent compatibility with a mortar interface is ensured.
More preferably, the weight ratio of the ethyl orthosilicate to the amino silicone oil is 1: 0.21.
By adopting the technical scheme, the grafting rate of the amino silicone oil and the silica sol is higher under the weight ratio.
Preferably, the concentration of the dopamine solution is 3g/L, and the weight ratio of the aramid fiber to the dopamine is 1: 0.03.
By adopting the technical scheme, the covering rate of the polydopamine layer on the aramid fiber is moderate, the influence of the hydrophilicity of the polydopamine layer on the light concrete is reduced on the premise that the polydopamine layer can still well cover the aramid fiber after the hydration reaction is finished, and the water absorption rate of the prepared light concrete is further reduced.
Preferably, the weight ratio of the multi-layer lightweight aggregate, the fine aggregate and the coarse aggregate is 3:1: 2; wherein the weight ratio of the multilayer lightweight aggregate with the size of 1-4.5 mm to the multilayer lightweight aggregate with the size of 4.5-9.5 mm is 1: 2.
By optimizing the gradation of the aggregate, the internal structure of the lightweight concrete can be improved in the hydration reaction process of the multi-layer lightweight aggregate, the amino silicone oil modified silica particles block pores in the lightweight concrete, the capillary content in the lightweight concrete is reduced, the porosity in the lightweight concrete is reduced, the compressive strength of the lightweight concrete is further improved, and the water absorption of the lightweight concrete is further reduced.
Preferably, the weight ratio of cement to water is 0.45.
By adopting the technical scheme, the water-cement ratio of the lightweight concrete is optimized, and the strength of the lightweight concrete is further improved.
Preferably, the additive is a silicone surfactant. More preferably, the additive is hydroxyl-terminated polydimethylsiloxane.
By adopting the technical scheme, the organosilicon surfactant is combined with the multilayer lightweight aggregate, so that the organosilicon surfactant has a synergistic effect in the aspects of improving the compressive strength, the flexural strength and the water absorption of lightweight concrete; the principle is as follows: the organosilicon surfactant can further promote the dispersion of the multi-layer lightweight aggregate, and is adhered to the surfaces of the fine aggregate and the coarse aggregate with amino silicone oil modified silicon dioxide particles through hydrogen bonding in the hydration reaction process, so that the number of harmful pores of the lightweight concrete is further reduced, and the internal structure of the lightweight concrete is optimized.
In summary, the present application has the following beneficial effects:
1. in the application, the poly-dopamine layer and the amino silicone oil modified silicon dioxide particle layer are sequentially arranged on the surface of the aramid fiber to form the multi-layer lightweight aggregate with high toughness and high reinforcing effect, and the multi-layer lightweight aggregate has better construction performance because the surface of the multi-layer lightweight aggregate is rich in polar groups such as amino, hydroxyl and the like; the aramid fiber inside the concrete is not easy to degrade in the hydration reaction process and is uniformly dispersed in the mortar, so that the lightweight concrete has excellent flexural strength; meanwhile, due to degradation of the polydopamine layer, the amino silicone oil modified silica particles can be gradually dispersed in the mortar, and the defect that traditional silica and other lightweight aggregates are easy to float upwards is overcome, so that the compressive strength of the lightweight concrete is improved.
2. In the application, the internal structure of the lightweight concrete is improved by means of optimizing the grading of each aggregate, selecting additives and the like, so that the quantity of harmful pores in the lightweight concrete is reduced, the water absorption of the lightweight concrete is reduced, and the freeze-thaw resistance and the compressive strength of the lightweight concrete are improved.
Detailed Description
Unless otherwise specified, the following preparation examples, examples and comparative examples have the following raw material sources as shown in table 1 below.
TABLE 1 sources of raw materials
Preparation of Multi-layered lightweight aggregate
Preparation example 1
A multi-layer lightweight aggregate is prepared by the following steps:
preparation of amino silicone oil modified silica particles:
weighing 10kg of ethyl orthosilicate and 1.5kg of amino silicone oil OFX-7700 (the nitrogen content is 0.27%), stirring and mixing uniformly, adding 0.2kg of catalyst ethylenediamine, 3kg of ethanol and 10kg of water, stirring and mixing uniformly, heating to 75 ℃, keeping the temperature for reaction for 10 hours, filtering after the reaction is finished, and performing vacuum drying on the obtained filter residue at the temperature of 40 ℃ to obtain amino silicone oil modified silicon dioxide particles;
preparing polydopamine modified aramid fiber:
extracting 1-9 mm aramid fibers for 24 hours by using acetone, and placing the aramid fibers at 40 ℃ for vacuum drying for 6 hours to obtain pretreated aramid fibers;
preparing a trihydroxymethylaminomethane-hydrochloric acid buffer solution with the pH of 8.5 in advance for later use; taking 105L of trihydroxymethyl aminomethane-hydrochloric acid buffer solution, adding 210g of dopamine hydrochloride into the 105L of trihydroxymethyl aminomethane-hydrochloric acid buffer solution to prepare a dopamine solution with the concentration of 2 g/L;
adding 10kg of pretreated aramid fiber into a dopamine solution at the temperature of 20 ℃ to ensure that the weight ratio of the aramid fiber to dopamine is 1:0.021, carrying out heat preservation reaction at the temperature of 20 ℃ for 24 hours, washing for three times after the reaction is finished, filtering, and drying at the temperature of 40 ℃ to obtain polydopamine modified aramid fiber;
preparation of multilayer lightweight aggregate:
then taking 50LpH ═ 8.5 trihydroxymethyl aminomethane-hydrochloric acid buffer solution for later use;
taking 10kg of polydopamine modified aramid fiber and 0.5kg of amino silicone oil modified silicon dioxide particles, adding the amino silicone oil modified silicon dioxide particles and the polydopamine modified aramid fiber into a trihydroxymethyl aminomethane-hydrochloric acid buffer solution, heating to 25 ℃, carrying out heat preservation reaction for 24 hours, washing for three times after the reaction is finished, filtering, and drying the obtained filter residue at 40 ℃ to obtain the multilayer light aggregate.
Preparation examples 2 to 4
A multi-layered lightweight aggregate differing from preparation example 1 in that the amino silicone oil used in the preparation step of the amino silicone oil-modified silica particles has a different nitrogen content:
wherein the amino silicone oil used in preparation example 2 was OFX-8040A (nitrogen content: 0.4%);
the aminosilicone oil used in preparation example 3 was OFX-8209 (nitrogen content 0.6%);
the aminosilicone oil used in preparation example 4 was OFX-8417 (nitrogen content 0.9%).
Preparation examples 5 to 6
A multi-layer lightweight aggregate is different from the aggregate prepared in preparation example 3 in that the weight ratio of ethyl orthosilicate to amino silicone oil is different:
wherein the weight ratio of the ethyl orthosilicate to the amino silicone oil in the preparation example 5 is 1: 0.21;
the weight ratio of ethyl orthosilicate to amino silicone oil in preparation example 6 was 1: 0.25.
Preparation examples 7 to 9
The difference between the multilayer lightweight aggregate and the preparation example 5 is that the concentration of a dopamine solution and the weight ratio of aramid fiber to dopamine in the preparation step of the polydopamine modified aramid fiber are different, and the specific values are shown in table 2:
TABLE 2 Process parameters in the preparation step of polydopamine modified aramid fibers
| Preparation examples | Concentration g/L of dopamine solution | Weight ratio of aramid fiber to dopamine |
| Preparation example 5 | 2 | 1：0.021 |
| Preparation example 7 | 4 | 1：0.021 |
| Preparation example 8 | 3 | 1：0.021 |
| Preparation example 9 | 3 | 1：0.03 |
Preparation example 10
The multilayer lightweight aggregate is different from the preparation example 1 in the preparation process parameters of the multilayer lightweight aggregate, and the specific step parameters are as follows:
preparation of amino silicone oil modified silica particles:
weighing 10kg of ethyl orthosilicate and 1.5kg of amino silicone oil OFX-7700 (the nitrogen content is 0.27%), stirring and mixing uniformly, adding 0.2kg of catalyst ethylenediamine, 3kg of ethanol and 10kg of water, stirring and mixing uniformly, heating to 80 ℃, keeping the temperature for reacting for 6 hours, and after the reaction is finished, carrying out vacuum drying at the temperature of 40 ℃ to obtain amino silicone oil modified silicon dioxide particles;
preparing polydopamine modified aramid fibers:
extracting aramid fibers of 1-9 mm by using acetone for 24 hours, and placing the aramid fibers at 40 ℃ for vacuum drying for 6 hours to obtain pretreated aramid fibers of 1-9 mm;
preparing a trihydroxymethylaminomethane-hydrochloric acid buffer solution with the pH of 8.5 in advance for later use; taking 105L of trihydroxymethyl aminomethane-hydrochloric acid buffer solution, adding 210g of dopamine hydrochloride into the 105L of trihydroxymethyl aminomethane-hydrochloric acid buffer solution to prepare a dopamine solution with the concentration of 2 g/L;
adding 10kg of pretreated aramid fiber into a dopamine solution at the temperature of 20 ℃ to ensure that the weight ratio of the aramid fiber to dopamine is 1:0.021, carrying out heat preservation reaction at the temperature of 25 ℃ for 48 hours, washing for three times after the reaction is finished, filtering, and drying at the temperature of 40 ℃ to obtain polydopamine modified aramid fiber;
preparation of multi-layer lightweight aggregate:
then taking 50LpH ═ 8.5 trihydroxymethyl aminomethane-hydrochloric acid buffer solution for later use;
taking 10kg of polydopamine modified aramid fiber and 0.5kg of amino silicone oil modified silica particles, adding the amino silicone oil modified silica particles and the polydopamine modified aramid fiber into a trihydroxymethyl aminomethane-hydrochloric acid buffer solution, heating to 50 ℃, carrying out heat preservation reaction for 8 hours, washing with water for three times after the reaction is finished, filtering, and drying at 40 ℃ to obtain the multilayer lightweight aggregate.
Examples
Example 1
The lightweight concrete has the following formula:
3.5kg of cement, 4.5kg of multi-layer lightweight aggregate prepared in preparation example 1, 3kg of coarse aggregate, 2.5kg of fine aggregate, 0.18kg of vegetable oil acid waterproofing agent and 1.6kg of water;
the multilayer lightweight aggregate is composed of 1-4.5 mm multilayer lightweight aggregate and 4.5-9.5 mm multilayer lightweight aggregate according to the weight ratio of 1: 1.
The preparation method comprises the following steps:
weighing cement, multilayer light aggregate, coarse aggregate, fine aggregate, vegetable oil acid waterproof agent and water according to the weight parts;
and (3) soaking the multi-layer lightweight aggregate in water for 5min, adding cement, coarse aggregate, fine aggregate and vegetable oil acid waterproof agent, and stirring and blending to obtain the lightweight concrete.
Examples 2 to 10
A lightweight concrete, which is different from example 1 in that the sources of the multi-layered lightweight aggregate are different, and the specific sources are as shown in table 3 below.
TABLE 3 sources of multi-layered lightweight aggregates
Examples 11 to 14
A lightweight concrete, which is different from example 9 in the aggregate gradation, is as shown in table 4 below.
TABLE 4 aggregate grading
Examples 15 to 16
A lightweight concrete, which is different from example 13 in the water cement ratio:
wherein, the weight of the cement in the embodiment 15 is 4.2kg, the weight of the water is 1.75kg, and the water-cement ratio is 0.416;
example 16 cement 3.9kg, water 1.75kg, water cement ratio 0.45.
Examples 17 to 19
A lightweight concrete, which is different from example 16 in the kind and parts by weight of the admixture;
wherein, the additive in the embodiment 17 is 0.18kg of polydimethylsiloxane;
example 18 the additive was 0.18kg of hydroxy terminated polydimethylsiloxane;
in example 19, the additive was 0.23kg of hydroxy terminated polydimethylsiloxane.
Comparative example
Comparative example 1
A lightweight concrete, which is different from example 1 in that 0.22kg of nano silica particles and 4.28kg of aramid fibers are used instead of the multi-layered lightweight aggregate; wherein the weight ratio of the aramid fiber with the size of 1-4.5 mm to the aramid fiber with the size of 4.5-9.5 mm is 1: 1.
Comparative example 2
A lightweight concrete, which is different from example 1 in that 4.5kg of polydopamine-modified aramid fiber is used instead of the multi-layered lightweight aggregate; wherein the weight ratio of the poly-dopamine-modified aramid fiber with the size of 1-4.5 mm to the poly-dopamine-modified aramid fiber with the size of 4.5-9.5 mm is 1: 1.
Performance test
Preparation of test pieces were prepared according to the preparation methods and the national standards of examples 1 to 19 and comparative examples 1 to 2, the test pieces were 100mm × 100mm × 100mm in specification, and after curing for 28 days, surface cleaning and drying were performed.
Detection method
Compressive strength: testing the 28d compressive strength of the test piece according to GB/T17671-2021;
breaking strength: testing the breaking strength of the test piece according to GB/T17671-2021;
water absorption: the test pieces were tested for water absorption according to JGT 266-2011.
TABLE 5 test results of test piece Properties
| Detecting items | 28d compressive strength/Mpa | Compressive strength/Mpa | Water absorption/%) |
| Example 1 | 41.32 | 13.63 | 3.95 |
| Example 2 | 46.91 | 15.69 | 3.17 |
| Example 3 | 48.85 | 16.41 | 2.90 |
| Example 4 | 48.98 | 16.46 | 4.64 |
| Example 5 | 50.42 | 16.99 | 2.68 |
| Example 6 | 50.59 | 17.05 | 3.65 |
| Example 7 | 50.80 | 17.13 | 2.70 |
| Example 8 | 51.31 | 17.32 | 2.55 |
| Example 9 | 51.39 | 17.35 | 2.54 |
| Example 10 | 37.35 | 12.32 | 3.38 |
| Example 11 | 51.69 | 17.46 | 2.50 |
| Examples12 | 51.48 | 17.38 | 2.53 |
| Example 13 | 51.94 | 17.55 | 2.46 |
| Example 14 | 51.60 | 17.43 | 2.51 |
| Example 15 | 48.73 | 16.37 | 2.91 |
| Example 16 | 52.15 | 17.63 | 2.43 |
| Example 17 | 51.98 | 17.57 | 2.46 |
| Example 18 | 52.37 | 17.71 | 2.08 |
| Example 19 | 52.45 | 17.74 | 1.86 |
| Comparative example 1 | 13.01 | 6.16 | 3.84 |
| Comparative example 2 | 31.82 | 10.45 | 6.81 |
As can be seen by combining the example 1 and the comparative examples 1-2 and combining the table 5, the effect of directly mixing the light aggregate nano-silica powder and the aramid fiber with mortar such as cement and the like is not good in the comparative example 1 without treatment, the nano-silica powder and the aramid fiber have a layering phenomenon in concrete, and the prepared light concrete has the compressive strength of only 13.01MPa, the flexural strength of 6.16MPa and the water absorption of 3.84%;
in the comparative example 2, the polydopamine modified aramid fiber is used as the lightweight aggregate, the compressive strength of the prepared concrete reaches 31.82MPa, the flexural strength is 10.45MPa, and the water absorption rate is as high as 6.81 percent, so that the dispersion effect of the polydopamine modified aramid fiber in the concrete is good, but the polydopamine layer can cause the water absorption rate of the lightweight concrete to be increased rapidly, and the performance is poor;
the compressive strength of the lightweight concrete prepared in the example 1 is as high as 41.32MPa, the flexural strength is 13.63MPa, and the water absorption rate is only 3.95%, which shows that: the interface compatibility between the multi-layer lightweight aggregate and mortar in the hydration reaction process is good, the compressive strength and the flexural strength of the lightweight concrete can be effectively improved, and the lightweight concrete has low water absorption.
It can be seen from the combination of examples 1-4 and table 5 that the content of nitrogen in the amino silicone oil determines the content of amino groups on the surface of the amino silicone oil-modified silica, and the water absorption of the lightweight concrete can be obviously reduced and the compressive strength and the flexural strength can be improved under the condition of moderate amino group content.
It can be seen from the combination of examples 3, 5 to 9 and table 5 that the water absorption of the lightweight concrete can be effectively reduced by optimizing the thickness of the polydopamine layer and the grafting ratio of the amino silicone oil modified silica.
It can be seen from the combination of examples 9, 11-16 and table 5 that the water-cement ratio and the gradation adjustment of the lightweight aggregate can significantly improve the structure of the lightweight concrete, thereby reducing the harmful pores of the lightweight concrete, further reducing the water absorption rate, and further improving the compressive strength and the flexural strength.
As can be seen by combining examples 15, 17-18 and Table 5, the effect of modifying concrete with hydroxy-terminated polydimethylsiloxane is superior to that of the common silicone waterproofing agent, probably because: the hydroxyl-terminated polydimethylsiloxane contains the hydroxyl-terminated groups, has better dispersion promoting effect on the multilayer light aggregate, and has synergistic interaction with amino silicone oil modified silica particles separated in the hydration process in the aspect of improving the water resistance of concrete.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (5)
1. The lightweight concrete is characterized by comprising the following raw materials in parts by weight:
350-420 parts of cement
450-600 parts of multi-layer lightweight aggregate
200-300 parts of fine aggregate
300-500 parts of coarse aggregate
18-23 parts of additive
160-175 parts of water;
the multilayer light aggregate is a composite material which takes aramid fiber as a core material, takes a polydopamine layer as a secondary outer layer and takes an amino silicone oil modified silicon dioxide particle layer as an outermost layer;
the concrete preparation steps of the multilayer lightweight aggregate are as follows:
preparation of amino silicone oil modified silica particles: uniformly mixing tetraethoxysilane and amino silicone oil according to the weight ratio of 1 (0.15-0.25), adding a catalyst, ethanol and water, heating to 75-80 ℃, carrying out heat preservation reaction for 6-10 hours, and carrying out vacuum drying after the reaction is finished to obtain amino silicone oil modified silicon dioxide particles;
preparing polydopamine modified aramid fibers: preparing a trihydroxymethylaminomethane-hydrochloric acid buffer solution with the pH =8.5, and adding dopamine hydrochloride into the trihydroxymethylaminomethane-hydrochloric acid buffer solution to prepare a dopamine solution with the concentration of 2-4 g/L; adding aramid fiber into a dopamine solution at the temperature of 20-25 ℃, wherein the weight ratio of the aramid fiber to dopamine is 1 (0.021-0.03), keeping the temperature, stirring and reacting for 24-48 h, and washing and drying to obtain polydopamine modified aramid fiber;
preparation of multilayer lightweight aggregate: preparing a trihydroxymethylaminomethane-hydrochloric acid buffer solution with the pH =8.5, adding amino silicone oil modified silica particles and polydopamine modified aramid fibers into the trihydroxymethylaminomethane-hydrochloric acid buffer solution, wherein the weight ratio of the amino silicone oil modified silica particles to the polydopamine modified aramid fibers is (0.05-0.15): 1, reacting at the temperature of 25-50 ℃ for 8-24 hours, and washing and drying to obtain a multilayer light aggregate;
the nitrogen content in the amino silicone oil is 0.4wt% -0.6 wt%.
2. The lightweight concrete according to claim 1, wherein: the weight ratio of the ethyl orthosilicate to the amino silicone oil is 1: 0.21.
3. The lightweight concrete according to claim 1, wherein: the concentration of the dopamine solution is 3g/L, and the weight ratio of the aramid fiber to the dopamine is 1: 0.03.
4. The lightweight concrete according to claim 1, wherein: the weight ratio of the multilayer lightweight aggregate to the fine aggregate to the coarse aggregate is 3:1: 2; wherein the weight ratio of the multilayer lightweight aggregate with the size of 1-4.5 mm to the multilayer lightweight aggregate with the size of 4.5-9.5 mm is 1: 2.
5. The lightweight concrete according to claim 1, wherein: the additive is an organosilicon surfactant.
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| CN112142386A (en) * | 2020-11-24 | 2020-12-29 | 佛山市建通混凝土制品有限公司 | Concrete with good wear resistance and preparation method thereof |
| CN112500079A (en) * | 2020-12-17 | 2021-03-16 | 台州东部建材科技有限公司 | Durable modified green concrete and preparation method thereof |
| CN113912338A (en) * | 2021-11-17 | 2022-01-11 | 陕西实丰混凝土有限公司 | Lightweight concrete |
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