CN115611578B - MOF dry-mixed mortar with early strength and low shrinkage and preparation method thereof - Google Patents

MOF dry-mixed mortar with early strength and low shrinkage and preparation method thereof Download PDF

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CN115611578B
CN115611578B CN202211277432.8A CN202211277432A CN115611578B CN 115611578 B CN115611578 B CN 115611578B CN 202211277432 A CN202211277432 A CN 202211277432A CN 115611578 B CN115611578 B CN 115611578B
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parts
ash
mof
dry
mortar
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CN115611578A (en
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陆俊
何智海
韩旭东
李静
桑伟
徐浩
何彬
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Zhejiang Yongjian New Material Technology Co ltd
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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
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The MOF dry-mixed mortar with early strength and low shrinkage comprises 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 reducer. And provides a preparation method of the MOF dry-mixed mortar with early strength and low shrinkage. The invention reasonably utilizes the agricultural solid waste, and the components are mutually cooperated, thus having higher environmental benefit and social benefit. Compared with the traditional dry-mixed mortar, the early strength of the mortar prepared by the method is obviously improved, and in addition, the method is beneficial to improving the carbonization resistance of the mortar and further reducing the carbonization shrinkage of the mortar while guaranteeing the reduction of the drying shrinkage and the improvement of the cracking resistance of the mortar.

Description

MOF dry-mixed mortar with early strength and low shrinkage and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to MOF dry-mixed mortar with early strength and low shrinkage and a preparation method thereof.
Background
Six doors of a business part, a construction part and the like are combined to issue a notification about the prohibition of on-site mortar stirring work in a limited period of part of cities in 6 months of 2007, 127 cities in the country are required to start the prohibition of on-site mortar stirring work (abbreviated as "prohibition of occurrence") in three batches from 9 months of 2007 to 7 months of 2009, and then local prohibition of occurrence work is sequentially promoted in various places. The method provides a considerable development space for dry-mixed mortar, and the annual yield of the dry-mixed mortar in China in 2019 is more than 1 hundred million tons according to statistics.
When dry-mixed mortar for construction is widely subjected to cracking in practical engineering, the surface of early mortar is easy to crack under the action of shrinkage stress due to internal water loss, insufficient strength and the like. To solve this problem, attention is currently focused on reducing the dry shrinkage and self-shrinkage of mortar. However, researchers have found that at high concentrations of CO 2 In the environment, the shrinkage of the mortar is quickened,this is believed to be the carbonization resulting in partial shrinkage of the mortar. Currently, global atmosphere CO 2 The concentration is in an ascending trend, and after the industrialization period, the CO in the atmosphere 2 The concentration increased from 278ppm to 400ppm. This means that the carbonization process of the cement mortar may be significantly accelerated. In cement mortar, ca (OH) 2 Hydrated calcium silicate (Hydrated calcium silicate, C-S-H), ettringite and part of the unreacted clinker are the main reactants for carbonization. Carbonization reaction pair Ca (OH) 2 The consumption of (2) can reduce the pH value in the pore liquid, lead to dulling of the surface of the steel bar and increase the corrosion risk of the steel bar, and in addition, carbonization and decalcification of C-S-H can also lead to degradation of the matrix performance, thereby leading to larger carbonization shrinkage.
To slow down the shrinkage development of mortar, the traditional approach is to reduce the cement usage or to add mineral admixtures, but this may lead to a decrease in early strength of the mortar. In addition, although the shrinkage reducing agent can be directly added to reduce the drying shrinkage and self-shrinkage of the mortar, the method lacks a direct effect on the carbonization resistance of the mortar and cannot effectively inhibit the development of carbonization shrinkage.
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, agricultural solid waste is modified and then used for replacing cement, in addition, MOF materials and silicon nitride fibers are added, and the early strength, the shrinkage resistance and the crack resistance of the dry-mixed mortar are improved by adjusting the proportion of the materials.
The technical scheme adopted 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: 295-314 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 reducer.
Further, the cement is 42.5-grade silicate cement, and the specific surface area is more than or equal to 300m 2 /kg; the specific surface area of the fly ash is more than or equal to 500m 2 /kg; fineness of the natural sandThe modulus is 2.4-3.0; the water reducer is a polycarboxylic acid powder water reducer, and the water reducing efficiency is 25%.
Still further, the MOF material is MOF-5 with specific surface area more than or equal to 2200m 2 And/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 stalk 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) The preparation method comprises the following steps of: 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 reducer
(2) Mixing MOF-5, a water reducing agent and water, and placing the mixture into an ultrasonic stirrer to stir uniformly, wherein stirring is recommended to be performed for 10-15min;
(3) Cement, hazelnut shell ash, sunflower straw ash, fly ash, natural sand and silicon nitride fiber with corresponding mass are placed in a stirrer to be slowly stirred for 160-200s;
(4) Adding 2/3-3/4 of the mixed solution obtained in the step (2) into a stirrer, slowly stirring for 50-80 s, adding the rest solution into the stirrer, and rapidly stirring for 160-200s to obtain new mortar.
Further, in the step (1), the production method of the hazelnut shell ash comprises the following steps: 1.1.1 Drying the fresh hazelnut shells in a blast oven at 110-130 ℃ for 24h;1.1.2 Crushing the dry hazelnut shell, placing the crushed dry hazelnut shell in a muffle furnace, calcining the crushed dry hazelnut shell at 500-600 ℃ for 1.5-2 hours, and taking out the dried hazelnut shell; 1.1.3 Grinding the ash after the hazelnut shell ash is cooled, and sieving the 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 stalk ash comprises the following steps: 1.2.1 Drying sunflower stalks in a blast oven at 110-130 ℃ for 24 hours; 1.2.2 Crushing the dry sunflower straw into fragments with the diameter 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 600 to 700 ℃, and taking out the fragments; 1.2.3 After the sunflower straw ash is cooled, grinding the ash and sieving the ground ash with a 200-mesh sieve to obtain the finished sunflower straw ash.
The technical conception of the invention is as follows: the prior researches show that partial micro-nano 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 Etc. The Metal-organic framework (Metal-organic frameworks, MOF) is porous organic-inorganic hybrid powder formed by coordination of organic ligands and Metal ions or clusters, the size of the porous organic-inorganic hybrid powder is in a micro-nano level, and a material named MOF-5 can be coordinated with calcium ions in mortar pore liquid to form Ca-MOF, so that hydration reaction is promoted, and the effect of optimizing a mortar microstructure is achieved. In addition, as the agricultural large country, agricultural wastes such as straw, broken shells and the like are treated in a mode of returning fertilizer to the field, and the treatment method is low in benefit and has environmental pollution risk. The hazelnut shell and sunflower straw are calcined and then ground into particles ranging from submicron to micron, and the particles are added into mortar to promote the early strength development of the mortar and improve the compactness. 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 shrinkage resistance of mortar can be improved by adding biomass ash such as hazelnut shell ash, sunflower straw ash and the like, wherein the chlorine salt content in the hazelnut shell ash component is considerable, so that the hazelnut shell ash has the effects of accelerating coagulation and improving early strength, the sunflower straw ash contains a higher SiO2 component and can be used as a pozzolan material to replace cement, and the additional C-S-H can be generated by consuming Ca (OH) 2, so that the carbonization raw material is reduced, and the carbonization shrinkage is reduced. MOF-5 can effectively promote cement hydration and improve compactness. The addition of the silicon nitride fiber can further improve the crack resistance of the mortar.
The beneficial effects of the invention are mainly shown in the following steps:
1. the invention uses the biomass ash to replace cement, and the biomass ash is dry mixed by adjusting the proportionThe mortar has better effect. Wherein the sunflower stalk ash has higher SiO 2 The content of the hazelnut shell ash can have a certain volcanic ash activity through high-temperature treatment, and the hazelnut shell ash has a considerable chloride salt component, so that the development of early strength of the mortar is promoted through controlling the doping amount. In addition, in order to promote the realization of the 'double carbon' target, the consumption of high carbon footprint building materials such as cement and the like is required to be reduced, the invention is beneficial to reducing the cement consumption and realizing the improvement of the mortar performance.
2. According to the invention, MOF-5 is added into dry-mixed mortar, so that the progress of hydration reaction is promoted, and in addition, the component can improve the compactness of the mortar, and is beneficial to 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: 295-314 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 reducer.
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 (metal oxide fiber), 1275 parts of natural sand, 221 parts of water, 25 parts of silicon nitride fiber, 4.5 parts of water reducer and 0.45 of water-gel ratio.
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 (metal oxide fiber), 1298 parts of natural sand, 224 parts of water, 18 parts of silicon nitride fiber, 4.2 parts of water reducer and 0.5 of water-gel ratio.
Or again; 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 (metal oxide fiber), 1328 parts of natural sand, 236 parts of water, 13 parts of silicon nitride fiber, 4.0 parts of water reducer and 0.55 part of water-gel 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 reducer and 0.5 part of water-gel ratio.
Further, the cement is 42.5-grade silicate cement, and the specific surface area is more than or equal to 300m 2 /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 reducer is a polycarboxylic acid powder water reducer, and the water reducing efficiency is 25%.
Still further, the MOF material is MOF-5 with specific surface area more than or equal to 2200m 2 And/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 stalk 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) The preparation method comprises the following steps of: 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 reducer
(2) Mixing MOF-5, a water reducing agent and water, and placing the mixture into an ultrasonic stirrer to stir uniformly, wherein stirring is recommended to be performed for 10-15min;
(3) Cement, hazelnut shell ash, sunflower straw ash, fly ash, natural sand and silicon nitride fiber with corresponding mass are placed in a stirrer to be slowly stirred for 160-200s;
(4) Adding 2/3-3/4 of the mixed solution obtained in the step (2) into a stirrer, slowly stirring for 50-80 s, adding the rest solution into the stirrer, and rapidly stirring for 160-200s to obtain new mortar.
Further, in the step (1), the production method of the hazelnut shell ash comprises the following steps: 1.1.1 Drying the fresh hazelnut shells in a blast oven at 110-130 ℃ for 24h;1.1.2 Crushing the dry hazelnut shell, placing the crushed dry hazelnut shell in a muffle furnace, calcining the crushed dry hazelnut shell at 500-600 ℃ for 1.5-2 hours, and taking out the dried hazelnut shell; 1.1.3 Grinding the ash after the hazelnut shell ash is cooled, and sieving the 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 stalk ash comprises the following steps: 1.2.1 Drying sunflower stalks in a blast oven at 110-130 ℃ for 24 hours; 1.2.2 Crushing the dry sunflower straw into fragments with the diameter 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 600 to 700 ℃, and taking out the fragments; 1.2.3 After the sunflower straw ash is cooled, grinding the ash and sieving the ground ash with a 200-mesh sieve to obtain the finished sunflower straw ash.
In this example, examples 1 to 3 were obtained by adjusting the amounts of the different components, and comparative example 1 was set for comparison of early strength, shrinkage resistance and crack resistance of 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 (metal oxide fiber), 1275 parts of natural sand, 221 parts of water, 25 parts of silicon nitride fiber, 4.5 parts of water reducer and 0.45 of water-gel ratio.
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 (metal oxide fiber), 1298 parts of natural sand, 224 parts of water, 18 parts of silicon nitride fiber, 4.2 parts of water reducer and 0.5 of water-gel 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 (metal oxide fiber), 1328 parts of natural sand, 236 parts of water, 13 parts of silicon nitride fiber, 4.0 parts of water reducer and 0.55 part of water-gel 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 water reducer and 0.5 part of water-cement ratio.
The mortar compressive strength test method is carried out by referring to JGJ/T70-2009 building mortar basic performance test method Standard. Because carbonization shrinkage often develops together with other types of shrinkage and cannot be measured independently, the invention refers to JGJ/T70-2009 'building mortar basic performance test method Standard', and a carbonization shrinkage measuring mode is improved and obtainedThe shrinkage test block is respectively placed in two environments for maintenance, one is a nitrogen environment: controlling the relative humidity to be (60+/-5)%, controlling the temperature to be (20+/-2)% DEG C, continuously introducing dry nitrogen into the curing container, and periodically checking CO 2 The concentration was maintained at a level of 0ppm and shrinkage values were recorded periodically to give a shrinkage value of 1; the other is an air environment: controlling the relative humidity to be (60+ -5)%, controlling the temperature to be (20+ -2) deg.C, and checking CO periodically 2 The concentration is maintained at the level of 400ppm, and the shrinkage value is measured periodically to obtain a shrinkage value 2, and the difference between the shrinkage value 1 and the shrinkage value 2 is the carbonization shrinkage. The crack resistance test of the cement mortar is carried out by referring to the test method of crack resistance of the cement mortar (JC/T951-2005). Specific results are shown in tables 1, 2, 3 and 4, wherein table 1 is a mortar compressive strength result (MPa), table 2 is a drying shrinkage result (shrinkage value 2), table 3 is a carbonization shrinkage result, and table 4 is a crack resistance test result (d is a crack width in mm).
TABLE 1
TABLE 2
TABLE 3 Table 3
TABLE 4 Table 4
As shown in Table 1, in combination with comparative example 1 and examples 1 to 3, the mortar prepared by the present method has better early compressive strength.
As shown in tables 2 and 3, in combination with comparative example 1 and examples 1 to 3, the drying shrinkage and carbonization shrinkage of the mortar prepared by the present method were significantly reduced, which indicates that the mortar prepared by the present invention has better shrinkage resistance and carbonization resistance.
As shown in Table 4, in combination with comparative example 1 and examples 1 to 3, the cracking resistance of the mortar prepared by the method is obviously improved, the width of cracks on the surfaces of the mortars of examples 1 to 3 is obviously smaller than that of the comparative example, and the number of cracks is obviously reduced.
Furthermore, with the increase in the water-gel ratio and the sand-lime ratio, the early compressive strength, shrinkage resistance and crack resistance of example 3 were still superior to those of comparative example 1. This further demonstrates the reliability of the mortar produced according to the invention.
The embodiments described in this specification are merely illustrative of the manner in which the inventive concepts may be implemented. The scope of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but the scope of the present invention and the equivalents thereof as would occur to one skilled in the art based on the 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: 295-314 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 reducer.
2. The early-strength low-shrinkage MOF dry-mixed mortar according to claim 1, wherein the cement is 42.5-grade Portland cement, and the specific surface area of the cement is more than or equal to 300 m/kg; the specific surface area of the fly ash is more than or equal to 500 m/kg; the fineness modulus of the natural sand is 2.4-3.0; the water reducer is a polycarboxylic acid powder water reducer, and the water reducing efficiency is 25%.
3. The MOF dry-mixed mortar with early strength and low shrinkage according to claim 1 or 2, wherein the MOF material is MOF-5, and the specific surface area is more than or equal to 2200 m/g; the tensile strength of the silicon nitride fiber is more than or equal to2500GPa, fiber diameter of 8-15The length of the fiber is 3-5 mm.
4. The 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 not less than 500m g/kg.
5. The early-strength low-shrinkage MOF dry-mixed mortar according to claim 1 or 2, wherein the specific surface area of sunflower straw ash is more than or equal to 500 m/kg.
6. A method for preparing the early strength low shrinkage MOF dry-mixed mortar according to claim 1, comprising the following steps:
(1) The preparation method comprises the following steps of: 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 reducer; the MOF material is MOF-5, and the specific surface area is more than or equal to 2200 m/g;
(2) Mixing MOF-5, a water reducing agent and water, and placing the mixture into an ultrasonic stirrer to stir uniformly for 10-15min;
(3) Cement, hazelnut shell ash, sunflower straw ash, fly ash, natural sand and silicon nitride fiber with corresponding mass are placed in a stirrer to be slowly stirred 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, adding the rest solution into the stirrer, and rapidly stirring for 160-200s to obtain the new mortar.
7. The method of claim 6, wherein in the step (1), the hazelnut shell ash is produced by: 1.1.1 Drying the fresh hazelnut shells in a blast oven at 110-130 ℃ for 24h;1.1.2 Crushing the dry hazelnut shell, placing the crushed dry hazelnut shell in a muffle furnace, calcining the crushed dry hazelnut shell at 500-600 ℃ for 1.5-2 hours, and taking out the dried hazelnut shell; 1.1.3 Grinding the ash after the hazelnut shell ash is cooled, and sieving the ash with a 200-mesh sieve to obtain the finished hazelnut shell ash.
8. The method according to claim 6 or 7, wherein in the step (1), the sunflower stalk ash is produced by: 1.2.1 Drying sunflower stalks in a blast oven at 110-130 ℃ for 24 hours; 1.2.2 Crushing the dry sunflower straw into fragments with the diameter 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 600 to 700 ℃, and taking out the fragments; 1.2.3 After the sunflower straw ash is cooled, grinding the ash and sieving the ground ash with a 200-mesh sieve to obtain the finished sunflower straw ash.
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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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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