CN112441792A - Regenerated thermal insulation mortar utilizing biomass ash and preparation method thereof - Google Patents

Regenerated thermal insulation mortar utilizing biomass ash and preparation method thereof Download PDF

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Publication number
CN112441792A
CN112441792A CN202011290251.XA CN202011290251A CN112441792A CN 112441792 A CN112441792 A CN 112441792A CN 202011290251 A CN202011290251 A CN 202011290251A CN 112441792 A CN112441792 A CN 112441792A
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China
Prior art keywords
mortar
ash
biomass
biomass ash
aggregate
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CN202011290251.XA
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Inventor
黄靓
王雨桐
邓鹏�
高畅
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Hunan University
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Hunan University
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017Aspects relating to the protection of the environment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a regenerative thermal insulation mortar using biomass ash and a preparation method thereof, wherein the components of the regenerative thermal insulation mortar comprise mortar aggregate, cement, biomass ash, fly ash, water, a water reducing agent and a cement reinforcing agent; the recycled aggregate is obtained by sorting, crushing, screening, grinding, screening and metering concrete waste, and the biomass ash is obtained by burning biomass fuel of a power plant. According to the invention, residual biomass ash and multi-source inorganic solid waste recycled aggregate generated by burning biomass fuel in a power plant or a brick kiln plant are utilized on the premise of not influencing the strength of mortar, wherein the biomass ash has good thermal insulation performance and volcanic ash activity, a part of cement is replaced to be used as a cementing material, and the application of the recycled fine aggregate has great significance for saving river sand resources and protecting the environment, the production cost is reduced, and the recycled fine aggregate has good economic, social and environmental benefits.

Description

Regenerated thermal insulation mortar utilizing biomass ash and preparation method thereof
Technical Field
The invention relates to the technical field of building engineering materials, in particular to regenerated thermal insulation mortar utilizing biomass ash and a preparation method thereof.
Background
In recent years, the building industry in China rises rapidly, and a large number of old urban areas are subjected to transformation and new construction, but the construction solid waste is increased. The stacking, transportation and landfill of a large amount of construction waste cause environmental pollution and consume a large amount of resources. In addition, China is a big country for crop production, and the rice yield in China in 2018 reaches 21213 million t, so that the produced rice hulls exceed 4200 million t, and the annual yield of agricultural straws in China reaches 6.4 hundred million t.
The rice hulls, the straws and the like are good biomass fuels, and with the increasingly prominent global energy crisis and environmental problems, the combustion and power generation of the biomass fuels instead of coal becomes an important way for developing low-carbon economy in various countries in the world, but how to treat biomass ash generated after the combustion of the biomass fuels is a problem which needs to be solved urgently at present. The biomass ash is gradually utilized in the fields of new energy, agriculture, building materials and chemical industry, and the added value is improved. The rice hull ash, straw ash and the like prepared by low-temperature incineration have high activity of volcanic ash, and can partially replace cement to be used as a concrete or mortar active mineral admixture. The rice hull ash, the straw ash and the like also have the characteristic of low heat conductivity coefficient, the mixing of the rice hull ash and the straw ash can obviously improve the heat insulation performance of concrete and mortar, and the application of biomass ash resources to heat insulation and energy saving materials becomes one of the hot problems of the current research. In the field of building materials, the rice hull ash can be used for producing black rice hull ash cement together with lime and other raw materials.
The Xixiaoyuan and the like in 4 and 17 months in 2013 disclose dry-mixed mortar prepared from reclaimed sand and a preparation method thereof (application number: 201310082740.X), wherein each raw material adopted by the dry-mixed mortar is cement, the reclaimed sand, natural sand, fly ash, waste rubber fine powder, a polymer modifier, an additive and an anionic surfactant. The invention reduces the cost of the mortar raw material by adopting the reclaimed sand and the waste rubber powder raw material, saves a large amount of natural resources and promotes the function of the mortar to be superior.
2016, 5, 10 days, old and super discloses a regenerated wet-mixed mortar and a preparation method (application number: 201610304065.4), wherein the components of the regenerated wet-mixed mortar comprise cement, limestone powder slurry with the water content of 30-60%, regenerated fine aggregate, natural medium sand and a water-retaining thickener. The invention adopts the technical method of pre-stirring the stone powder slurry and special additives, and solves the problems of high water absorption, quick workability loss, strength reduction and the like of the regenerated fine aggregate.
The above background query results show that each expert and scholars designs and invents the recycled aggregate mortar with different functions. The invention provides regenerated thermal insulation mortar utilizing biomass ash and a preparation method thereof, which respectively replace natural sand and cement with regenerated aggregate and biomass ash, have great significance for saving river sand resources and protecting the environment, reduce the production cost and have good economic, social and environmental benefits.
Disclosure of Invention
The invention aims to provide regenerated thermal insulation mortar utilizing biomass ash and a preparation method thereof, which adopt multisource inorganic solid waste regenerated aggregate to replace part of natural river sand on the premise of adopting the biomass ash to replace part of cement as a cementing material without obviously influencing the strength of the mortar, so as to solve the problems of environmental pollution and river sand natural resource shortage caused by inorganic solid waste such as cement production, construction waste and the like.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a regenerated thermal insulation mortar using biomass ash and a preparation method thereof are characterized in that: the components of the mortar comprise mortar aggregate, natural sand, cement, biomass ash, fly ash, water, a water reducing agent and a cement reinforcing agent; the mass percentages of the components are as follows: 5-40% of mortar aggregate, 15-30% of cement, 5-15% of biomass ash, 0-5% of fly ash, 10-30% of water, 0.5-1% of water reducing agent and 0-1% of cement reinforcing agent.
As a preferred embodiment of the present invention, the mortar aggregate includes, but is not limited to, natural sand, waste concrete recycled fine aggregate, granite waste, tailings, and the like.
As a preferred embodiment of the invention, the biomass ash is obtained by grinding and sieving biomass fuel in a power plant or a brick kiln plant, including but not limited to rice hull ash and straw ash, and has a fineness modulus of 3.6-9.5.
As a preferred embodiment of the invention, the maximum particle size of the mortar aggregate is not more than 4.75mm, the fineness modulus is 1.8-3.2, the particle grading is continuous grading, and the performance index of the mortar aggregate meets the relevant regulation of the existing national standard 'construction sand' GB/T14684; the recycled fine aggregate is obtained by sorting, crushing, screening, grinding, screening and metering pure concrete waste generated during the demolition of buildings, and the performance index of the recycled fine aggregate meets the relevant regulations of the existing national standard 'recycled fine aggregate for concrete and mortar' GB/T25176.
In a preferred embodiment of the invention, the cement is ordinary portland cement with a grade of 32.5 or 42.5.
As a preferred embodiment of the present invention, the fly ash grade is first grade, and the class is class C or class F fly ash.
In a preferred embodiment of the present invention, the water reducing agent is a polycarboxylic acid high performance water reducing agent.
In a preferred embodiment of the present invention, the cement reinforcing agent is a water-retaining thickening material.
As a preferred embodiment of the present invention, the preparation method of the recycled fine aggregate thermal mortar comprises the following steps:
a. crushing waste concrete blocks, granite waste materials and tailings, or screening by using a 4.75mm square-hole sieve by using natural sand, and selecting mortar aggregate with the particle size of not more than 4.75 mm;
b. obtaining biomass ash obtained after biomass fuel is combusted from a power plant or a brick kiln plant, grinding for 30min, and sieving to obtain the biomass ash for mortar preparation;
c. accurately weighing the components of the 50% mortar aggregate, the cement, the biomass ash and the fly ash according to the mass percentage ratio, mixing, putting the components into a stirrer, stirring for 1-2 min, adding the rest 50% mortar aggregate, the accurately weighed water reducing agent and the cement reinforcing agent, and performing dry stirring to uniformly mix the components to obtain the dry powder of the thermal insulation mortar;
d. accurately weighing the mortar by using water, mixing, adding the mixture into the heat-preservation mortar dry powder, and stirring for at least 2min to obtain the mortar.
The invention has the following beneficial effects:
the method comprises the steps of adopting waste concrete in the building demolition waste to obtain recycled aggregate or granite waste, tailings and other recycled raw materials to replace partial natural sand through sorting, crushing, screening, grinding, screening and metering, and adopting biomass ash remaining from biomass fuel combustion to replace partial cement to be used as a cementing material to prepare recycled aggregate mortar, wherein the addition of the biomass ash can improve the thermal insulation performance of the mortar, the pulverized biomass ash and the recycled aggregate have a synergistic effect, and the biomass ash powder can fill the pores of the recycled aggregate, reduce the water absorption of the recycled aggregate and strengthen the performance of the recycled aggregate; the method reduces land resources occupied by stacking multi-source inorganic solid wastes, relieves the environmental pollution caused by the inorganic solid wastes, and simultaneously can reduce the exploitation of natural gravels, thereby saving resources, reducing the production cost and having good economic, social and environmental benefits.
Drawings
FIG. 1 is a process flow diagram of the regenerated thermal mortar using biomass ash and the preparation method thereof according to the present invention.
Detailed Description
The technical solution of the present invention will be described more clearly and completely with reference to the accompanying drawings and the detailed description of the invention.
Example 1:
a regenerated thermal mortar using biomass ash and a preparation method thereof, the components of which comprise regenerated fine aggregate, natural sand, cement, power plant rice hull ash, fly ash, water, a water reducing agent and a cement reinforcing agent; the mass percentages of the components are as follows: 5-30% of recycled fine aggregate, 10-35% of natural sand, 15-30% of cement, 5-15% of power plant rice hull ash, 0-5% of fly ash, 10-30% of water, 0.5-1% of water reducing agent and 0-1% of cement reinforcing agent.
In specific implementation, the power plant rice hull ash is obtained by burning, grinding and sieving biomass fuel rice hulls in a power plant, and the fineness modulus is 3.6-9.5.
In specific implementation, the recycled fine aggregate is obtained by sorting, crushing, screening, grinding, screening and metering pure concrete waste generated during building demolition, the maximum particle size is not more than 4.75mm, the fineness modulus is 2.5-3.2, the particle grading is continuous grading, and the performance index meets the existing national standard of recycled fine aggregate for concrete and mortar GB/T25176; the particle size of the natural sand is less than 4.75mm, the fineness modulus is 1.8-3.2, and the particle composition is continuous composition.
In specific implementation, the cement is ordinary portland cement with the grade of 42.5.
In specific implementation, the grade of the fly ash is first grade, and the type of the fly ash is F-type fly ash.
In specific implementation, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
In a specific implementation, the cement reinforcing agent is a water-retaining thickening material.
In specific implementation, the preparation method of the regenerated thermal mortar by using the rice hull ash comprises the following steps:
a. sorting the recycled construction waste, and picking out waste concrete blocks;
b. crushing the waste concrete blocks, screening by using a 4.75mm square-hole sieve, and selecting the waste concrete blocks with the particle size of not more than 4.75mm as recycled fine aggregate;
c. obtaining rice hull ash obtained after burning the biomass fuel rice hulls from a power plant or a brick kiln plant, grinding for 30min, and sieving to obtain the rice hull ash for preparing mortar;
d. accurately weighing the components of 50% of the regenerated fine aggregate, the natural sand, the cement, the power plant rice hull ash and the fly ash according to the mass percentage ratio, mixing, putting the mixture into a stirrer, stirring for 1-2 min, adding the rest 50% of the regenerated fine aggregate, the accurately weighed water reducing agent and the cement reinforcing agent, and performing dry stirring to uniformly mix the materials to obtain the dry powder of the thermal insulation mortar;
e. accurately weighing the mortar by using water, mixing, adding the mixture into the heat-preservation mortar dry powder, and stirring for at least 2min to obtain the mortar.
The mortar prepared according to the mixture ratio has the following performance test results: the consistency is 85 +/-5 mm, the water retention rate is 90 +/-3%, the 28d compressive strength is 11.57-15.62 MPa, the requirement of GB/T25181-.
Example 2:
a regenerated thermal insulation mortar using biomass ash and a preparation method thereof, the components of which comprise regenerated fine aggregate, natural sand, cement, power plant straw ash, fly ash, water, a water reducing agent and a cement reinforcing agent; the mass percentages of the components are as follows: 21.76 percent of recycled fine aggregate, 19.51 percent of natural sand, 26.73 percent of cement, 11.06 percent of straw ash of a power plant, 2.98 percent of fly ash, 16.49 percent of water, 0.88 percent of water reducing agent and 0.59 percent of cement reinforcing agent.
In specific implementation, the power plant straw ash is obtained by burning biomass fuel straws in a power plant, grinding and sieving, and the fineness modulus is 4.2.
In specific implementation, the recycled fine aggregate is obtained by sorting, crushing, screening, grinding, screening and metering pure concrete waste generated during building demolition, the maximum particle size of the recycled fine aggregate is not more than 4.75mm, the fineness modulus is 2.6, the particle grading is continuous grading, and the performance index meets the existing national standard of recycled fine aggregate for concrete and mortar GB/T25176; the particle size of the natural sand is less than 4.75mm, the fineness modulus is 2.9, and the particle composition is continuous composition.
In specific implementation, the cement is ordinary portland cement with the grade of 42.5.
In specific implementation, the grade of the fly ash is first grade, and the type of the fly ash is F-type fly ash.
In specific implementation, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
In a specific implementation, the cement reinforcing agent is a water-retaining thickening material.
In specific implementation, the preparation method of the regenerated thermal insulation mortar by using the straw ash comprises the following steps:
a. sorting the recycled construction waste, and picking out waste concrete blocks;
b. crushing the waste concrete blocks, screening by using a 4.75mm square-hole sieve, and selecting the waste concrete blocks with the particle size of not more than 4.75mm as recycled fine aggregate;
c. straw ash obtained after biomass fuel straw combustion is obtained from a power plant or a brick kiln plant, and the straw ash is ground for 30min and then sieved to obtain straw ash for mortar preparation;
d. accurately weighing the components of the 50% regenerated fine aggregate, the natural sand, the cement, the power plant straw ash and the fly ash according to the mass percentage ratio, mixing, putting the mixture into a stirrer, stirring for 1-2 min, adding the rest 50% regenerated fine aggregate and the accurately weighed water reducing agent and cement reinforcing agent, and performing dry stirring to uniformly mix the materials to obtain the dry powder of the thermal insulation mortar;
e. accurately weighing the mortar by using water, mixing, adding the mixture into the heat-preservation mortar dry powder, and stirring for at least 2min to obtain the mortar.
The mortar prepared according to the mixture ratio has the following performance test results: the consistency is 88mm, the water retention rate is 90 percent, the 28d compressive strength is 14.79MPa, the requirements of GB/T25181 and 2010 premixed mortar on wet-mixed mortar are met, and the heat-insulating property is good.
The skilled person should know that: while the invention has been described in terms of the above specific embodiments, this description is for clarity purposes only and those skilled in the art will recognize that the description as a whole may be combined with various embodiments as appropriate to meet the needs of the other embodiments; in addition, the inventive concept is not limited thereto and any modification utilizing the inventive concept is intended to be included within the scope of the present patent claims.

Claims (9)

1. A regenerated thermal insulation mortar using biomass ash and a preparation method thereof are characterized in that: the components of the mortar comprise mortar aggregate, natural sand, cement, biomass ash, fly ash, water, a water reducing agent and a cement reinforcing agent; the mass percentages of the components are as follows: 5-40% of mortar aggregate, 15-30% of cement, 5-15% of biomass ash, 0-5% of fly ash, 10-30% of water, 0.5-1% of water reducing agent and 0-1% of cement reinforcing agent.
2. The regenerative thermal mortar using biomass ash and the preparation method thereof according to claim 1, wherein the regenerative thermal mortar using biomass ash comprises: the mortar aggregate includes but is not limited to natural sand, waste concrete recycled fine aggregate, granite waste, tailings and the like.
3. The regenerative thermal mortar using biomass ash and the preparation method thereof according to claim 1, wherein the regenerative thermal mortar using biomass ash comprises: the biomass ash is obtained by burning biomass fuel in a power plant or a brick kiln plant, grinding and sieving, including but not limited to rice hull ash and straw ash, and has the fineness modulus of 3.6-9.5.
4. The regenerative thermal mortar using biomass ash and the preparation method thereof according to claim 1, wherein the regenerative thermal mortar using biomass ash comprises: the maximum particle size of the mortar aggregate is not more than 4.75mm, the fineness modulus is 1.8-3.2, the particle composition is continuous composition, and the performance index of the mortar aggregate meets the relevant regulations of the existing national standard 'construction sand' GB/T14684; the recycled fine aggregate is obtained by sorting, crushing, screening, grinding, screening and metering pure concrete waste generated during the demolition of buildings, and the performance index of the recycled fine aggregate meets the relevant regulations of the existing national standard 'recycled fine aggregate for concrete and mortar' GB/T25176.
5. The regenerative thermal mortar using biomass ash and the preparation method thereof according to claim 1, wherein the regenerative thermal mortar using biomass ash comprises: the cement is ordinary portland cement with the grade of 32.5 or 42.5.
6. The regenerative thermal mortar using biomass ash and the preparation method thereof according to claim 1, wherein the regenerative thermal mortar using biomass ash comprises: the grade of the fly ash is first grade, and the class of the fly ash is C-class or F-class fly ash.
7. The regenerative thermal mortar using biomass ash and the preparation method thereof according to claim 1, wherein the regenerative thermal mortar using biomass ash comprises: the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
8. The regenerative thermal mortar using biomass ash and the preparation method thereof according to claim 1, wherein the regenerative thermal mortar using biomass ash comprises: the cement reinforcing agent is a water-retaining thickening material.
9. The method for preparing recycled mortar according to any one of claims 1 to 7, wherein:
a. crushing waste concrete blocks, granite waste materials and tailings, or screening by using a 4.75mm square-hole sieve by using natural sand, and selecting mortar aggregate with the particle size of not more than 4.75 mm;
b. obtaining biomass ash obtained after biomass fuel is combusted from a power plant or a brick kiln plant, grinding for 30min, and sieving to obtain the biomass ash for mortar preparation;
c. accurately weighing the components of the 50% mortar aggregate, the cement, the biomass ash and the fly ash according to the mass percentage ratio, mixing, putting the components into a stirrer, stirring for 1-2 min, adding the rest 50% mortar aggregate, the accurately weighed water reducing agent and the cement reinforcing agent, and performing dry stirring to uniformly mix the components to obtain the dry powder of the thermal insulation mortar;
d. accurately weighing the mortar by using water, mixing, adding the mixture into the heat-preservation mortar dry powder, and stirring for at least 2min to obtain the mortar.
CN202011290251.XA 2020-11-18 2020-11-18 Regenerated thermal insulation mortar utilizing biomass ash and preparation method thereof Pending CN112441792A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114685130A (en) * 2022-02-23 2022-07-01 青岛海靓新型建材有限公司 Proportioning method for preparing dry-mixed mortar by using recycled fine aggregate
CN114907069A (en) * 2022-05-10 2022-08-16 黑龙江省建筑材料工业规划设计研究院 Preparation method of biomass ash and coal gangue composite aggregate mortar
CN115611578A (en) * 2022-10-19 2023-01-17 浙江永坚新材料科技股份有限公司 Early-strength low-shrinkage MOF dry-mixed mortar and preparation method thereof

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CN108046671A (en) * 2017-12-29 2018-05-18 河北建筑工程学院 A kind of rice hull ash concrete and preparation method thereof
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114685130A (en) * 2022-02-23 2022-07-01 青岛海靓新型建材有限公司 Proportioning method for preparing dry-mixed mortar by using recycled fine aggregate
CN114907069A (en) * 2022-05-10 2022-08-16 黑龙江省建筑材料工业规划设计研究院 Preparation method of biomass ash and coal gangue composite aggregate mortar
CN115611578A (en) * 2022-10-19 2023-01-17 浙江永坚新材料科技股份有限公司 Early-strength low-shrinkage MOF dry-mixed mortar and preparation method thereof
CN115611578B (en) * 2022-10-19 2023-09-19 浙江永坚新材料科技股份有限公司 MOF dry-mixed mortar with early strength and low shrinkage and preparation method thereof

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