CN115611578A - Early-strength low-shrinkage MOF dry-mixed mortar and preparation method thereof - Google Patents
Early-strength low-shrinkage MOF dry-mixed mortar and preparation method thereof Download PDFInfo
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- CN115611578A CN115611578A CN202211277432.8A CN202211277432A CN115611578A CN 115611578 A CN115611578 A CN 115611578A CN 202211277432 A CN202211277432 A CN 202211277432A CN 115611578 A CN115611578 A CN 115611578A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The MOF dry-mixed mortar with early strength and low shrinkage comprises the following raw materials in parts by mass: 295 to 314 portions of cement, 21 to 39 portions of hazelnut shell ash, 21 to 49 portions of sunflower straw ash, 73 to 86 portions of fly ash, 4 to 15 portions of MOF material, 1275 to 1328 portions of natural sand, 220 to 236 portions of water, 12 to 25 portions of silicon nitride fiber and 4.0 to 4.5 portions of water reducing agent. And provides a preparation method of the MOF dry-mixed mortar with early strength and low shrinkage. The invention reasonably utilizes agricultural solid wastes, and the components are mutually cooperated, thereby having higher environmental benefit and social benefit. Compared with the traditional dry-mixed mortar, the mortar prepared by the method has obviously improved early strength, and in addition, the invention is also beneficial to improving the anti-carbonization performance of the mortar and further reducing the carbonization shrinkage of the mortar while ensuring the reduction of the drying shrinkage and the improvement of the anti-cracking performance of the mortar.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to early-strength low-shrinkage MOF dry-mixed mortar and a preparation method thereof.
Background
In 2007, 6.6, six departments such as the ministry of commerce jointly issue a notice about prohibition of on-site mortar stirring work in a limited period of part of cities, and 127 cities in the whole country are required to start the prohibition of on-site mortar stirring work (abbreviated as "forbid" in three batches from 9.1.9 to 7.1.2009) and then to successively promote local "forbid" work in various places. The method provides a considerable development space for the dry-mixed mortar, and the annual output of the dry-mixed mortar in China in 2019 is more than 1 hundred million tons according to statistics.
The problem of cracking of the existing dry-mixed mortar for construction generally faces in actual engineering, and the surface of the mortar is easy to crack under the action of shrinkage stress due to internal moisture loss, insufficient strength and the like of the early mortar. To address this problem, attention is now generally focused on reducing the drying shrinkage and self-shrinkage of the mortar. However, it has been found by researchers that CO is present in high concentrations 2 Under the circumstances, the shrinkage of the mortar is accelerated, which is considered to be that the carbonization causes the partial shrinkage of the mortar. Currently, global atmospheric CO 2 The concentration of CO in the atmosphere rises and after the industrialization period 2 The concentration increased from 278ppm to 400ppm. This means that the process of cement mortar carbonation can be accelerated considerably. In cement mortar, ca (OH) 2 Calcium silicate hydrate (C-S-H), ettringite and partially unreacted clinker are the main reactants of carbonization. Carbonization reaction pair Ca (OH) 2 The consumption of (2) can reduce the pH value in the pore liquid, leading to the surface dulling of the reinforcing steel bars and increasing the corrosion risk of the reinforcing steel bars, and in addition, the carbonization and decalcification of C-S-H can cause the degradation of the matrix performance, thereby leading to larger carbonization shrinkage.
In order to slow down the development of mortar shrinkage, the conventional method is to reduce the amount of cement or add mineral admixtures, but this may result in the early strength of the mortar being reduced. In addition, although the shrinkage reducing agent can be directly added to reduce the drying shrinkage and self-shrinkage of the mortar, the method has no direct effect on the carbonization resistance of the mortar, and the development of carbonization shrinkage cannot be effectively inhibited.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the MOF dry-mixed mortar with early strength and low shrinkage and the preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the MOF dry-mixed mortar with early strength and low shrinkage comprises the following raw materials in parts by mass: 295 to 314 portions of cement, 21 to 39 portions of hazelnut shell ash, 21 to 49 portions of sunflower straw ash, 73 to 86 portions of fly ash, 4 to 15 portions of MOF material, 1275 to 1328 portions of natural sand, 220 to 236 portions of water, 12 to 25 portions of silicon nitride fiber and 4.0 to 4.5 portions of water reducing agent.
Furthermore, the cement is 42.5-grade portland cement, and the specific surface area of the cement is more than or equal to 300m 2 Per kg; the specific surface area of the fly ash is more than or equal to 500m 2 Per kg; the fineness modulus of the natural sand is 2.4-3.0; the water reducing agent is a polycarboxylic acid powder water reducing agent, and the water reducing efficiency is 25%.
Still further, the MOF material is MOF-5, and the specific surface area of the MOF material is more than or equal to 2200m 2 (ii) in terms of/g. The tensile strength of the silicon nitride fiber is more than or equal to 2500GPa, the fiber diameter is 8-15 μm, and the fiber length is 3-5 mm.
Preferably, the specific surface area of the hazelnut shell ash is more than or equal to 500m 2 /kg。
More preferably, the specific surface area of the sunflower straw ash is more than or equal to 500m 2 /kg。
A preparation method of MOF dry-mixed mortar with early strength and low shrinkage comprises the following steps:
(1) Preparing the following raw materials in parts by mass: 295 to 314 portions of cement, 21 to 39 portions of hazelnut shell ash, 21 to 49 portions of sunflower straw ash, 73 to 86 portions of fly ash, 4 to 15 portions of MOF material, 1275 to 1328 portions of natural sand, 220 to 236 portions of water, 12 to 25 portions of silicon nitride fiber and 4.0 to 4.5 portions of water reducing agent
(2) Mixing MOF-5, a water reducing agent and water, placing the mixture in an ultrasonic stirrer, and stirring uniformly for 10-15min;
(3) Placing cement, hazelnut shell ash, sunflower straw ash, fly ash, natural sand and silicon nitride fiber with corresponding mass in a stirrer to stir slowly for 160-200s;
(4) And (3) adding 2/3-3/4 of the mixed solution obtained in the step (2) into a stirrer, slowly stirring for 50-80 s, then adding the residual solution into the stirrer, and quickly stirring for 160-200s to obtain the new mixed mortar.
Further, in the step (1), the production method of the hazelnut shell ash comprises the following steps: 1.1.1 Fresh hazelnut shells are dried in a forced air oven at 110-130 ℃ for 24h;1.1.2 Crushing the dried hazelnut shell, putting the crushed dried hazelnut shell into a muffle furnace, calcining the crushed dried hazelnut shell at 500-600 ℃ for 1.5-2 h, and taking out the calcined hazelnut shell; 1.1.3 After the hazelnut shell ash is cooled, grinding the ash and sieving the ground hazelnut shell ash with a 200-mesh sieve to obtain the finished hazelnut shell ash.
Still further, in the step (1), the production method of the sunflower straw ash comprises the following steps: 1.2.1 Drying sunflower straws in a forced air oven at 110-130 ℃ for 24h;1.2.2 Crushing dry sunflower straws into fragments with the diameter of less than or equal to 3mm, placing the fragments into a muffle furnace, calcining the fragments for 2 to 3 hours at the temperature of between 600 and 700 ℃, and taking out the fragments; 1.2.3 After the sunflower straw ash is cooled, grinding the ash and sieving the ground sunflower straw ash with a 200-mesh sieve to obtain the finished sunflower straw ash.
The technical conception of the invention is as follows: the existing research shows that part of micro-nano-grade powder has higher specific surface area and specific surface energy and can be used for strengthening the performance of cement-based materials, such as graphene and nano SiO 2 And Al 2 O 3 And the like. The Metal-organic frameworks (MOFs) are porous organic-inorganic hybrid powder formed by coordination of organic ligands and Metal ions or clusters, the size of the Metal-organic frameworks is micro-nano, and a material named as MOF-5 can be coordinated with calcium ions in mortar pore liquid to form Ca-MOF, so that the hydration reaction is promoted, and the effect of optimizing the microstructure of the mortar is achieved. In addition, as a big agricultural country, agricultural wastes such as straws and broken shells are treated in a 'fertilizing in field' mode, and the treatment method is low in benefit and has environmental pollution risks. The hazelnut shell and sunflower straw are calcined and ground into particles in the range from submicron to micron, and the particles are added into mortar to promote the growth of the hazelnut shell and the sunflower strawThe early strength of the mortar is developed, and the compactness is improved. In addition, the silicon nitride fiber has tensile strength and elastic modulus superior to those of steel fiber, and can further improve the crack resistance of the mortar.
According to the invention, the mechanical property and the anti-shrinkage property of the mortar can be improved by adding biomass ash such as hazelnut shell ash, sunflower straw ash and the like, wherein the hazelnut shell ash component has considerable content of chloride, so that the hazelnut shell ash component has the effects of accelerating coagulation and improving early strength, the sunflower straw ash component contains a high SiO2 component, the sunflower straw ash component can be used as a volcanic ash material to replace cement, extra C-S-H can be generated by consuming Ca (OH) 2, and the carbonization raw materials and the carbonization shrinkage are reduced. The MOF-5 can effectively promote the hydration of cement and improve the compactness. The addition of the silicon nitride fiber can further improve the crack resistance of the mortar.
The invention has the following beneficial effects:
1. the biomass ash is used for replacing cement, and the biomass ash can play a good effect in the dry-mixed mortar by adjusting the proportion. Wherein the sunflower straw ash has higher SiO 2 The content of the hazelnut shell ash can have certain volcanic ash activity through high-temperature treatment, and the hazelnut shell ash has considerable chlorine salt components, so that the development of the early strength of the mortar can be promoted by controlling the mixing amount. In addition, in order to promote the realization of the double-carbon target, the usage amount of high-carbon footprint building materials such as cement needs to be reduced, the invention is beneficial to reducing the consumption of cement and realizing the improvement of mortar performance.
2. According to the invention, the MOF-5 is added into the dry-mixed mortar, so that the hydration reaction is promoted, and in addition, the component can improve the compactness of the mortar, and is helpful for limiting the development of shrinkage and carbonization.
3. According to the invention, the silicon nitride fiber is added into the dry-mixed mortar, so that the crack resistance of the mortar is further improved.
Detailed Description
The invention is further described below.
The MOF dry-mixed mortar with early strength and low shrinkage comprises the following raw materials in parts by mass: 295 to 314 portions of cement, 21 to 39 portions of hazelnut shell ash, 21 to 49 portions of sunflower straw ash, 73 to 86 portions of fly ash, 4 to 15 portions of MOF material, 1275 to 1328 portions of natural sand, 220 to 236 portions of water, 12 to 25 portions of silicon nitride fiber and 4.0 to 4.5 portions of water reducing agent.
The formulation of this example is:
314 parts of cement, 39 parts of hazelnut shell ash, 49 parts of sunflower straw ash, 74 parts of fly ash, 15 parts of MOF, 1275 parts of natural sand, 221 parts of water, 25 parts of silicon nitride fiber, 4.5 parts of a water reducing agent and a water-to-glue ratio of 0.45.
Or is; 300 parts of cement, 27 parts of hazelnut shell ash, 31 parts of sunflower straw ash, 81 parts of fly ash, 9 parts of MOF, 1298 parts of natural sand, 224 parts of water, 18 parts of silicon nitride fiber, 4.2 parts of a water reducing agent and 0.5 of water-to-gel ratio.
Or then, or; 296 parts of cement, 21 parts of hazelnut shell ash, 21 parts of sunflower straw ash, 86 parts of fly ash, 4 parts of MOF, 1328 parts of natural sand, 236 parts of water, 13 parts of silicon nitride fiber, 4.0 parts of a water reducing agent and 0.55 of water-to-glue ratio.
Or 295 parts of cement, 30 parts of hazelnut shell ash, 35 parts of sunflower straw ash, 73 parts of fly ash, 10 parts of MOF material, 1300 parts of natural sand, 220 parts of water, 12 parts of silicon nitride fiber, 4.3 parts of water reducing agent and 0.5 of water-to-glue ratio.
Further, the cement is 42.5-grade portland cement, and the specific surface area of the cement is more than or equal to 300m 2 Per kg; the specific surface area of the fly ash is more than or equal to 500m 2 Per kg; the fineness modulus of the natural sand is 2.4-3.0; the water reducing agent is a polycarboxylic acid powder water reducing agent, and the water reducing efficiency is 25%.
Still further, the MOF material is MOF-5, and the specific surface area of the MOF material is more than or equal to 2200m 2 (ii) in terms of/g. The tensile strength of the silicon nitride fiber is more than or equal to 2500GPa, the fiber diameter is 8-15 mu m, and the fiber length is 3-5 mm.
Preferably, the specific surface area of the hazelnut shell ash is more than or equal to 500m 2 /kg。
More preferably, the specific surface area of the sunflower straw ash is more than or equal to 500m 2 /kg。
A preparation method of MOF dry-mixed mortar with early strength and low shrinkage comprises the following steps:
(1) Preparing the following raw materials in parts by mass: 295 to 314 portions of cement, 21 to 39 portions of hazelnut shell ash, 21 to 49 portions of sunflower straw ash, 73 to 86 portions of fly ash, 4 to 15 portions of MOF material, 1275 to 1328 portions of natural sand, 220 to 236 portions of water, 12 to 25 portions of silicon nitride fiber and 4.0 to 4.5 portions of water reducing agent
(2) Mixing MOF-5, a water reducing agent and water, placing the mixture in an ultrasonic stirrer, and stirring uniformly for 10-15min;
(3) Placing cement, hazelnut shell ash, sunflower straw ash, fly ash, natural sand and silicon nitride fiber with corresponding mass in a stirrer to stir slowly for 160-200s;
(4) And (3) adding 2/3-3/4 of the mixed solution obtained in the step (2) into a stirrer, slowly stirring for 50-80 s, then adding the residual solution into the stirrer, and quickly stirring for 160-200s to obtain the new mixed mortar.
Further, in the step (1), the production method of the hazelnut shell ash comprises the following steps: 1.1.1 Fresh hazelnut shells are dried in a forced air oven at 110-130 ℃ for 24h;1.1.2 Crushing the dried hazelnut shell, putting the crushed dried hazelnut shell into a muffle furnace, calcining the crushed dried hazelnut shell at 500-600 ℃ for 1.5-2 h, and taking out the calcined hazelnut shell; 1.1.3 After the hazelnut shell ash is cooled, grinding the ash and sieving the ground hazelnut shell ash with a 200-mesh sieve to obtain the finished hazelnut shell ash.
Still further, in the step (1), the production method of the sunflower straw ash comprises the following steps: 1.2.1 Drying the sunflower straws in a forced air oven at 110-130 ℃ for 24 hours; 1.2.2 Crushing dry sunflower straws into fragments with the diameter of less than or equal to 3mm, placing the fragments into a muffle furnace, calcining the fragments for 2 to 3 hours at the temperature of between 600 and 700 ℃, and taking out the fragments; 1.2.3 ) after the sunflower straw ash is cooled, grinding the ash and sieving the ground sunflower straw ash with a 200-mesh sieve to obtain the finished sunflower straw ash.
In this example, the amounts of the different components were adjusted to obtain examples 1 to 3, and comparative example 1 was set for comparing the early strength, shrinkage resistance and crack resistance of the mortar.
Example 1
314 parts of cement, 39 parts of hazelnut shell ash, 49 parts of sunflower straw ash, 74 parts of fly ash, 15 parts of MOF, 1275 parts of natural sand, 221 parts of water, 25 parts of silicon nitride fiber, 4.5 parts of a water reducing agent and a water-to-glue ratio of 0.45.
Example 2
300 parts of cement, 27 parts of hazelnut shell ash, 31 parts of sunflower straw ash, 81 parts of fly ash, 9 parts of MOF, 1298 parts of natural sand, 224 parts of water, 18 parts of silicon nitride fiber, 4.2 parts of a water reducing agent and 0.5 of water-to-glue ratio.
Example 3
296 parts of cement, 21 parts of hazelnut shell ash, 21 parts of sunflower straw ash, 86 parts of fly ash, 4 parts of MOF, 1328 parts of natural sand, 236 parts of water, 13 parts of silicon nitride fiber, 4.0 parts of a water reducing agent and 0.55 of water-to-glue ratio.
Comparative example 1
367 parts of cement, 81 parts of fly ash, 1298 parts of natural sand, 224 parts of water, 4.2 parts of a water reducing agent and 0.5 of water-to-glue ratio.
The mortar compressive strength test method is carried out according to JGJ/T70-2009 Standard for testing basic performance of building mortar. Because the carbonization shrinkage is often developed together with other types of shrinkage and cannot be measured independently, the carbonization shrinkage measurement mode is improved by referring to JGJ/T70-2009 'test method standard for basic performance of building mortar', shrinkage test blocks are respectively placed in two environments for maintenance, and one is a nitrogen environment: controlling relative humidity at 60 + -5% and temperature at 20 + -2 deg.C, continuously introducing dry nitrogen gas into the curing container, and periodically checking CO 2 The concentration is maintained at 0ppm level, and the contraction value is recorded periodically to obtain a contraction value 1; the other is an air environment: controlling the relative humidity to be (60 +/-5)%, the temperature to be (20 +/-2) ° C and periodically checking CO 2 And (3) maintaining the concentration at a level of 400ppm, periodically measuring the shrinkage value to obtain a shrinkage value 2, and obtaining the difference value between the shrinkage value 1 and the shrinkage value 2, namely the carbonization shrinkage. The cracking resistance test of the cement mortar is carried out according to the cracking resistance test method of the cement mortar (JC/T951-2005). Specific results are shown in tables 1, 2, 3 and 4, where table 1 shows the mortar compressive strength results (MPa), table 2 shows the drying shrinkage results (shrinkage value 2), table 3 shows the carbonization shrinkage results, and table 4 shows the crack resistance test results (d is crack width in mm).
TABLE 1
TABLE 2
TABLE 3
TABLE 4
As shown in Table 1, in combination with comparative example 1 and examples 1 to 3, it can be seen that the mortar prepared by the method has better early compressive strength.
As shown in tables 2 and 3, in combination with comparative example 1 and examples 1 to 3, it can be seen that the mortar prepared by the method has significantly reduced drying shrinkage and carbonization shrinkage, which indicates that the mortar prepared by the present invention has better shrinkage resistance and carbonization resistance.
As shown in Table 4, by combining the comparative example 1 and the examples 1 to 3, the crack resistance of the mortar prepared by the method is obviously improved, the width of the cracks on the surfaces of the mortars of the examples 1 to 3 is obviously smaller than that of the comparative example, and the number of the cracks is obviously reduced.
In addition, the early compressive strength, shrinkage resistance and crack resistance of example 3 are still superior to those of comparative example 1 with increasing water-cement ratio and mortar ratio. This further illustrates the reliability of the mortars made according to the invention.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (8)
1. The MOF dry-mixed mortar with early strength and low shrinkage is characterized by comprising the following raw materials in parts by mass: 295 to 314 portions of cement, 21 to 39 portions of hazelnut shell ash, 21 to 49 portions of sunflower straw ash, 73 to 86 portions of fly ash, 4 to 15 portions of MOF material, 1275 to 1328 portions of natural sand, 220 to 236 portions of water, 12 to 25 portions of silicon nitride fiber and 4.0 to 4.5 portions of water reducing agent.
2. The MOF dry-mixed mortar with early strength and low shrinkage of claim 1, wherein the cement is 42.5-grade portland cement with specific surface area of more than or equal to 300m 2 Per kg; the specific surface area of the fly ash is more than or equal to 500m < 2 >/kg; the fineness modulus of the natural sand is 2.4-3.0; the water reducing agent is a polycarboxylic acid powder water reducing agent, and the water reducing efficiency is 25%.
3. The MOF dry-mixed mortar with early strength and low shrinkage of claim 1 or 2, wherein the MOF material is MOF-5, and the specific surface area of the MOF material is more than or equal to 2200m 2 (iv) g; the tensile strength of the silicon nitride fiber is more than or equal to 2500GPa, the fiber diameter is 8-15 mu m, and the fiber length is 3-5 mm.
4. An early-strength low-shrinkage MOF dry-mixed mortar according to claim 1 or 2, wherein the specific surface area of the hazelnut shell ash is more than or equal to 500m 2 /kg。
5. The MOF dry-mixed mortar with early strength and low shrinkage of claim 1 or 2, wherein the specific surface area of the sunflower straw ash is more than or equal to 500m 2 /kg。
6. A method for preparing the MOF dry-mixed mortar with early strength and low shrinkage according to claim 1, wherein the method comprises the following steps:
(1) Preparing the following raw materials in parts by mass: 295-314 parts of cement, 21-39 parts of hazelnut shell ash, 21-49 parts of sunflower straw ash, 73-86 parts of fly ash, 4-15 parts of MOF material, 1275-1328 parts of natural sand, 220-236 parts of water, 12-25 parts of silicon nitride fiber and 4.0-4.5 parts of water reducing agent;
(2) Mixing MOF-5, a water reducing agent and water, placing the mixture in an ultrasonic stirrer, and stirring uniformly for 10-15min;
(3) Placing cement, hazelnut shell ash, sunflower straw ash, fly ash, natural sand and silicon nitride fiber with corresponding mass in a stirrer and slowly stirring for 160-200s;
(4) And (3) adding 2/3-3/4 of the mixed solution obtained in the step (2) into a stirrer, slowly stirring for 50-80 s, then adding the residual solution into the stirrer, and quickly stirring for 160-200s to obtain the new mixed mortar.
7. The method for preparing the hazelnut shell ash according to claim 6, wherein in the step (1), the hazelnut shell ash is produced by: 1.1.1 Fresh hazelnut shells are dried in a forced air oven at 110-130 ℃ for 24h;1.1.2 Crushing dried hazelnut shells, placing the crushed dried hazelnut shells in a muffle furnace, calcining the crushed dried hazelnut shells at 500-600 ℃ for 1.5-2 h, and taking out the calcined dried hazelnut shells; 1.1.3 After the hazelnut shell ash is cooled, grinding the ash and sieving the ground hazelnut shell ash with a 200-mesh sieve to obtain the finished hazelnut shell ash.
8. The method of claim 6 or 7, wherein in the step (1), the sunflower straw ash is produced by the following method: 1.2.1 Drying the sunflower straws in a forced air oven at 110-130 ℃ for 24 hours; 1.2.2 Crushing dry sunflower straws into fragments with the diameter of less than or equal to 3mm, placing the fragments into a muffle furnace, calcining the fragments for 2 to 3 hours at the temperature of between 600 and 700 ℃, and taking out the fragments; 1.2.3 ) after the sunflower straw ash is cooled, grinding the ash and sieving the ground sunflower straw ash with a 200-mesh sieve to obtain the finished sunflower straw ash.
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| US11834372B1 (en) * | 2023-03-27 | 2023-12-05 | United Arab Emirates University | Titanium based organic polymers and a method of making and using same |
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| CN108191359A (en) * | 2018-02-06 | 2018-06-22 | 合肥广民建材有限公司 | A kind of anti-accumulation of salt in the surface soil keeps the temperature impervious weather-resistant and high-strength degree composite mortar and preparation method thereof |
| CN108821690A (en) * | 2018-07-20 | 2018-11-16 | 北京工业大学 | A kind of preparation method for the MOF high performance concrete that intensity high convergency is small |
| CN112441792A (en) * | 2020-11-18 | 2021-03-05 | 湖南大学 | Regenerated thermal insulation mortar utilizing biomass ash and preparation method thereof |
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| CN108191359A (en) * | 2018-02-06 | 2018-06-22 | 合肥广民建材有限公司 | A kind of anti-accumulation of salt in the surface soil keeps the temperature impervious weather-resistant and high-strength degree composite mortar and preparation method thereof |
| CN108821690A (en) * | 2018-07-20 | 2018-11-16 | 北京工业大学 | A kind of preparation method for the MOF high performance concrete that intensity high convergency is small |
| CN112441792A (en) * | 2020-11-18 | 2021-03-05 | 湖南大学 | Regenerated thermal insulation mortar utilizing biomass ash and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11834372B1 (en) * | 2023-03-27 | 2023-12-05 | United Arab Emirates University | Titanium based organic polymers and a method of making and using same |
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