CN112408875A - Regenerated geopolymer mortar and preparation method and application thereof - Google Patents

Regenerated geopolymer mortar and preparation method and application thereof Download PDF

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Publication number
CN112408875A
CN112408875A CN202011232096.6A CN202011232096A CN112408875A CN 112408875 A CN112408875 A CN 112408875A CN 202011232096 A CN202011232096 A CN 202011232096A CN 112408875 A CN112408875 A CN 112408875A
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CN
China
Prior art keywords
recycled
fine aggregate
geopolymer mortar
mortar
reclaimed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011232096.6A
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Chinese (zh)
Inventor
冯源
谢建和
陈维
麦子桦
薛紫欣
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Guangdong University of Technology
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Guangdong University of Technology
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Priority to CN202011232096.6A priority Critical patent/CN112408875A/en
Publication of CN112408875A publication Critical patent/CN112408875A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C04B28/006Compositions 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 mineral polymers, e.g. geopolymers of the Davidovits type
    • 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
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/16Waste materials; Refuse from building or ceramic industry
    • 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses reclaimed geopolymer mortar and a preparation method and application thereof, the reclaimed geopolymer mortar is prepared by utilizing reclaimed micro powder and reclaimed fine aggregate which are subjected to high-temperature heating modification, and the reclaimed micro powder and the reclaimed fine aggregate are subjected to high-temperature heating modification to generate a rehydration effect and generate new C-S-H gel; and the recycled fine aggregate and the recycled micro powder are matched with each other to jointly improve the mechanical property of the recycled geopolymer mortar. The reclaimed geopolymer mortar has good compression resistance and fracture resistance, and can be widely applied to building engineering.

Description

Regenerated geopolymer mortar and preparation method and application thereof
Technical Field
The invention relates to the technical field of building materials, in particular to reclaimed geopolymer mortar and a preparation method and application thereof.
Background
In recent years, with the acceleration of the modern construction process of China, the production and consumption of cement in China are high for years. It is statistical that about 1t of CO will be released per ton of Portland cement produced2CO currently emitted by cement production2Occupies CO in the world25 to 7 percent of the total discharge amount. Geological gatheringThe compound (geopolymer) was originally proposed by the french scientist Joseph Davidovits in 1978, is an inorganic polymer with a three-dimensional network structure consisting of aluminum-oxygen tetrahedron and silicon-oxygen tetrahedron structural units, is an amorphous or semi-crystalline aluminosilicate gel material with a three-dimensional network structure formed by alkali-exciting substances rich in Si and Al, has excellent mechanical properties, is acid-base-resistant, fire-resistant and high-temperature-resistant, can replace common cement, has application in building materials, high-strength materials, solid-core solid waste materials, sealing materials, high-temperature-resistant materials and the like, has more advantages in solving environmental pollution compared with cement base, and is an ecological environment-friendly building material; in addition, the energy consumption and the waste discharge amount of the geopolymer in the production process are very low, and the application of the geopolymer has great significance for reducing resource exploitation and protecting the ecological environment.
With the increasing construction waste, recycling thereof is receiving much attention. The recycled geopolymer mortar is prepared by replacing natural sand with recycled fine aggregate prepared from construction waste at present, but the mechanical property of the recycled geopolymer mortar is not as good as that of the common geopolymer mortar, and the recycled geopolymer mortar cannot meet the application requirement. The main reasons for this are: the recycled fine aggregate obtained by simple crushing has rough surface and remains old cement mortar, the recycled fine aggregate has a large amount of microcracks in the interior due to rough surface and more edges and corners, and also contains cement stone particles with small apparent density, and the strength of the recycled aggregate is lower than that of natural aggregate due to the reasons, and the water absorption of the recycled aggregate is higher due to the microcracks and the cement mortar adhered and hardened on the surface. Chinese patent CN111302688A (published japanese 2020.6.19) discloses a process for treating construction waste, which comprises heating the construction waste, sieving to obtain recycled high-quality aggregate, and further preparing recycled mortar, but the flexural strength and compressive strength of the recycled mortar are still poor.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defect and the defect of poor mechanical property of the existing regenerated mortar, provide the regenerated geopolymer mortar, recycle the waste concrete, respectively prepare the regenerated fine aggregate and the regenerated micro powder, and then further prepare the regenerated geopolymer mortar, wherein the breaking strength and the compression strength of the regenerated geopolymer mortar are improved, and the mechanical property of the regenerated geopolymer mortar is good.
The invention also aims to provide a preparation method of the reclaimed geopolymer mortar.
The invention also aims to provide application of the reclaimed geopolymer mortar.
The above purpose of the invention is realized by the following technical scheme:
the recycled geopolymer mortar is prepared from the following components in parts by mass:
the recycled fine aggregate and the recycled micro powder are prepared by screening and heating and modifying waste concrete at 200-800 ℃ for 3-5 h.
The method comprises the steps of respectively preparing regenerated micro powder and regenerated fine aggregate from waste concrete through screening and heating modification, and then further preparing regenerated geopolymer mortar, wherein the regenerated micro powder generates a rehydration effect after being heated and modified at a high temperature, can play a role of a cementing material, and forms new C-S-H gel in the hydration process; in addition, the heating treatment peels off the old cement mortar adhered to the surfaces of the recycled fine aggregate and the recycled micro powder, so that the reinforcement purpose is achieved, the recycled fine aggregate can partially replace the natural fine aggregate to play a role in framework and filling, the whole stacking of the recycled geopolymer mortar is more compact, the strength is improved, the performance of the recycled geopolymer mortar is better than that of the natural fine aggregate, the recycled micro powder and the recycled fine aggregate are matched with each other in a certain proportion, the recycled geopolymer mortar with excellent flexural strength and compressive strength can be prepared, and the purpose of recycling the waste concrete is achieved.
Preferably, the composition is prepared from the following components in parts by mass:
preferably, the recycled fine aggregate has a particle diameter d1D is more than 01≤4.75mm。
Preferably, the particle size of the regenerated micropowder is d2D is more than 02≤45μm。
Preferably, the temperature of the heating modification is 600-800 ℃.
Retarders of the present invention include, but are not limited to, calcium sucralose.
The alkali-activator of the present invention includes, but is not limited to, sodium hydroxide.
Preferably, the natural fine aggregate has a particle diameter d3D is more than 03≤4.75mm。
Preferably, the natural fine aggregate is river sand.
The invention protects the preparation method of the reclaimed geopolymer mortar, which comprises the following steps:
s1, crushing and screening waste concrete, and heating and modifying at 200-800 ℃ for 3-5 hours to obtain regenerated fine aggregate and regenerated micro powder;
s2, uniformly mixing the recycled fine aggregate, the recycled micro powder, the slag micro powder, the fly ash, the natural fine aggregate, the alkali activator, the water glass, the retarder and the water which are prepared in the step S1 to prepare the recycled geopolymer mortar.
Preferably, the heating rate of the heating modification in the step S1 is 5-15 ℃/min.
The invention also protects the application of the reclaimed geopolymer mortar in the building engineering.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of respectively preparing regenerated micro powder and regenerated fine aggregate from waste concrete through screening and heating modification, and then further preparing regenerated geopolymer mortar, wherein the regenerated micro powder can play a role of a cementing material, and new C-S-H gel is generated in a hydration process; in addition, the heating treatment peels off the recycled fine aggregate and the old cement mortar attached to the surface of the recycled micro powder, so that the aim of reinforcement is fulfilled, and the recycled fine aggregate can play a role in framework and filling. The reclaimed geopolymer mortar has good compression resistance and fracture resistance, and can be widely applied to building engineering.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
Example 1
The recycled geopolymer mortar is prepared from the following components in parts by mass:
particle diameter d of the recycled fine aggregate1Is (0 < d)1Not more than 4.75mm), the particle size d of the regenerated micro powder2Is (0 < d)2Less than or equal to 45 mu m), and the regenerated fine aggregate and the regenerated micro powder are prepared by screening and heating modification of waste concrete for 3 hours.
The preparation method of the recycled geopolymer mortar comprises the following steps:
s1, crushing waste concrete; crushing by using a jaw crusher; crushing to obtain waste concrete blocks with the particle size of less than or equal to 40 mm; screening the crushed waste concrete blocks, and screening out regenerated micro powder with the particle size of less than or equal to 45 microns by adopting a vibrating screen machine in cooperation with a screen with the particle size of 0.045 mm; sieving the recycled fine aggregate with the particle size of less than or equal to 4.75mm by adopting a vibrating screen and a 4.75mm screen mesh;
s2, carrying out high-temperature heating modification on the regenerated micro powder and the regenerated fine aggregate, wherein the high-temperature heating mechanism of the regenerated micro powder is as follows: heating from room temperature to 400 deg.C at a speed of 10 deg.C/min, maintaining the temperature for 150min, heating, and naturally cooling to room temperature; wherein the high-temperature heating mechanism of the recycled fine aggregate is as follows: heating from room temperature to 200 deg.C at a speed of 10 deg.C/min, maintaining the temperature for 150min, heating, and naturally cooling to room temperature;
s3, mixing regenerated micro powder, slag micro powder, fly ash, regenerated fine aggregate, natural fine aggregate, alkali activator, water glass, retarder and water to obtain the regenerated geopolymer mortar; the mixing process comprises the following steps: (1) adding the reinforced modified regenerated micro powder, the slag micro powder and the fly ash into a cement mortar stirrer, and uniformly stirring for 3min to uniformly stir the three; (2) adding the reinforced modified recycled fine aggregate and the natural fine aggregate into a cement mortar stirrer, and uniformly stirring for 3min to uniformly stir the three; (3) pouring an alkali activator, water glass and a retarder into a beaker, and manually stirring for 2min by using a glass cup; (4) and adding the stirred mixed solution into a cement mortar stirrer, and uniformly stirring for 2 min. Test pieces were prepared next: (5) discharging, putting into a mould, and vibrating on a vibrating table (the vibration frequency is 50Hz) for 3min to remove bubbles in the mortar; (6) after vibration molding, placing the test piece into a standard curing box for standard curing for 24 hours; (7) and (4) removing the mold after standard maintenance is carried out for 24 hours, then placing the test piece into a standard maintenance box for maintenance for 7 days, taking out the test piece when in a formal experiment, and placing the test piece into absolute ethyl alcohol to prevent the test piece from being hydrated continuously. Test piece size: 160mm x 40mm prism test pieces.
Example 2
The components and parts by mass of the recycled geopolymer mortar and the preparation method of the recycled geopolymer mortar are the same as those in example 1, except that the high-temperature heating temperature of the recycled fine aggregate and the recycled micro powder is replaced by 400 ℃.
Example 3
The components and parts by mass of the recycled geopolymer mortar and the preparation method of the recycled geopolymer mortar are the same as those in example 1, except that the high-temperature heating temperature of the recycled fine aggregate and the recycled micro powder is changed to 600 ℃.
Example 4
The components and parts by mass of the recycled geopolymer mortar and the preparation method of the recycled geopolymer mortar are the same as those in example 1, except that the high-temperature heating temperature of the recycled fine aggregate and the recycled micro powder is changed to 800 ℃.
Example 5
The components and parts by mass of a reclaimed geopolymer mortar are shown in Table 1, and the preparation method of the reclaimed geopolymer mortar is the same as that of example 1.
Example 6
The components and parts by mass of a reclaimed geopolymer mortar are shown in Table 1, and the preparation method of the reclaimed geopolymer mortar is the same as that of example 1.
Comparative example 1
The components and parts by mass of the reclaimed geopolymer mortar of this comparative example were the same as those in example 1 except that the reclaimed fine aggregate and the reclaimed fine powder were not subjected to the heat-modifying treatment.
Comparative example 2
The components and parts by mass of the reclaimed geopolymer mortar of this comparative example were the same as in example 1 except that the reclaimed fine aggregate was replaced with natural fine aggregate.
Comparative example 3
The components and the parts by mass of the recycled cement-based mortar of the comparative example are the same as those in example 1, except that the recycled fine aggregate is replaced with natural fine aggregate, and the slag micropowder and the fly ash are replaced with ordinary portland cement.
Comparative example 4
The components and parts by mass of the reclaimed geopolymer mortar of this comparative example were the same as those in example 1, except that the reclaimed fine aggregate was replaced with natural fine aggregate, and the reclaimed fine powder was not subjected to heat-modifying treatment.
Comparative example 5
The components and the parts by mass of the recycled cement-based mortar of the comparative example are the same as those in example 1, except that the recycled fine aggregate is replaced with natural fine aggregate, the recycled micropowder is not subjected to heat modification treatment, and the slag micropowder and the fly ash are replaced with ordinary portland cement.
Comparative example 6
The components and the parts by mass of the natural cement-based mortar of the present comparative example were the same as those in example 1, except that the recycled fine aggregate was replaced with the natural fine aggregate, and the slag fine powder, the fly ash and the recycled fine powder were replaced with the ordinary portland cement.
Comparative example 7
The components and the parts by mass of the recycled cement-based mortar of this comparative example are the same as those in example 1, except that the recycled fine aggregate is not subjected to the heat-modifying treatment, and the slag fine powder, the fly ash and the recycled fine powder are replaced with ordinary portland cement.
The amounts of the respective components used in the mortars of examples 2 to 4 and comparative examples 1 to 7 are shown in Table 1. The particle size of the natural fine aggregate is less than or equal to 4.75mm, and the natural fine aggregate is natural river sand; the retarder is calcium saccharate, wherein the water-cement ratio is 0.5.
TABLE 1 raw materials and their parts by mass in examples 2 to 4 and comparative examples 1 to 7
Performance testing
1. Test method
(1) Mechanical property of regenerated geopolymer mortar
According to the cement mortar strength test method, a prism with the size of 160mm multiplied by 40mm is used as a research object to carry out compression and bending tests on the regenerated geopolymer mortar, and a test instrument is a YAW-300C type compression and bending test machine.
2. Test results
TABLE 2 results of performance test of each example and comparative example
As can be seen from table 2, the main influencing factors of examples 1 to 4 are the heating temperature of the recycled fine aggregate, and the flexural strength of the recycled geopolymer mortar are both increased and then decreased at 200 ℃ to 800 ℃, wherein the optimal flexural strength can be obtained after heating at 600 ℃, the optimal compressive strength can be obtained after heating at 400 ℃, but the flexural strength and the flexural strength of the total recycled geopolymer mortar can reach the level of the existing geopolymer mortar. In contrast, in comparative example 1, the compressive strength of the waste concrete which is not subjected to high-temperature heating modification is reduced by 13.1%; comparative example 2 in the case where no recycled fine aggregate was added, the compressive strength was decreased; comparative example 3 replaces the recycled fine aggregate with natural fine aggregate, slag micropowder and fly ash in the cementing material are all replaced with ordinary portland cement, and the recycled micropowder is only used for reinforcing the cement-based mortar, so that the flexural strength is reduced by about 10.9 percent compared with comparative example 2, and the flexural strength is reduced by about 19.1 percent compared with comparative example 2; it can be seen that the recycled fine aggregate and the recycled micro powder which are modified at high temperature are matched with each other to really have a strengthening effect on the geopolymer mortar only by utilizing the limited effect of the recycled micro powder and the mechanical property of the cement-based mortar is inferior to that of the geopolymer mortar in comparison examples 4-7. Examples 1 to 6 show that the compressive strength and the flexural strength of the recycled geopolymer mortar doped with the recycled fine aggregate and the recycled micro powder subjected to high-temperature treatment are similar to those of the geopolymer mortar prepared by using the natural fine aggregate, the slag and the fly ash, even higher than those of the natural geopolymer mortar, and the recycled geopolymer mortar can be well applied to the construction industry.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The recycled geopolymer mortar is characterized by comprising the following components in parts by mass:
the recycled fine aggregate and the recycled micro powder are prepared by screening and heating and modifying waste concrete at 200-800 ℃ for 3-5 h.
2. The recycled geopolymer mortar of claim 1, which is prepared from the following components in parts by mass:
3. the recycled geopolymer mortar of claim 1 or 2, wherein the recycled fine aggregate has a particle size d1D is more than 01≤4.75mm。
4. The recycled geopolymer mortar of claim 1, wherein the recycled micropowder has a particle size of d2D is more than 02≤45μm。
5. The recycled geopolymer mortar of claim 1, wherein the temperature of the heat modification is 600 to 800 ℃.
6. The recycled geopolymer mortar of claim 1, wherein the natural fine aggregate has a particle size d3D is more than 03≤4.75mm。
7. The recycled geopolymer mortar of claim 1, wherein the retarder is calcium saccharate.
8. The method for producing reclaimed geopolymer mortar according to any one of claims 1 to 7, comprising the steps of:
s1, crushing and screening waste concrete, and heating and modifying at 200-800 ℃ for 3-5 hours to obtain regenerated fine aggregate and regenerated micro powder;
s2, uniformly mixing the recycled fine aggregate, the recycled micro powder, the slag micro powder, the fly ash, the natural fine aggregate, the alkali activator, the water glass, the retarder and the water which are prepared in the step S1 to prepare the recycled geopolymer mortar.
9. The method according to claim 8, wherein the heating rate of the heating modification in step S1 is 5-15 ℃/min.
10. Use of the reclaimed geopolymer mortar of any one of claims 1 to 7 in construction engineering.
CN202011232096.6A 2020-11-06 2020-11-06 Regenerated geopolymer mortar and preparation method and application thereof Pending CN112408875A (en)

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