CN111138134A - High-ductility fiber-reinforced recycled mortar for building 3D printing and preparation method thereof - Google Patents

High-ductility fiber-reinforced recycled mortar for building 3D printing and preparation method thereof Download PDF

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Publication number
CN111138134A
CN111138134A CN201911399186.1A CN201911399186A CN111138134A CN 111138134 A CN111138134 A CN 111138134A CN 201911399186 A CN201911399186 A CN 201911399186A CN 111138134 A CN111138134 A CN 111138134A
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China
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parts
printing
building
mortar
mixture
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CN201911399186.1A
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Chinese (zh)
Inventor
肖建庄
丁陶
邹帅
段珍华
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Tongji University
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Tongji University
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Priority to CN201911399186.1A priority Critical patent/CN111138134A/en
Publication of CN111138134A publication Critical patent/CN111138134A/en
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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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/402Methods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00Materials specially adapted for additive manufacturing
    • 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 relates to the field of building 3D printing and waste recycling, in particular to high-ductility fiber reinforced recycled mortar for building 3D printing and a preparation method thereof. The high-ductility fiber-reinforced recycled mortar for building 3D printing comprises the following components in parts by weight: cement: 550-800 parts; fly ash: 200-450 parts; reclaimed sand: 1000 parts of (A); regeneration of PET short fiber: 10-16 parts; defoaming agent: 1.0-1.5 parts; water reducing agent: 0.5-3.8 parts; sodium gluconate: 0.5-0.7 part; nano clay: 4.0-7.0 parts; cellulose: 1.1-1.6 parts; water: 300-600 parts. By doping the recycled PET short fibers into the recycled mortar for 3D printing of the building and assisting with additives for regulation, the material not only meets the requirements of pumpability, extrudability and constructability of 3D printing ink of the building, but also has the advantage of high ductility.

Description

High-ductility fiber-reinforced recycled mortar for building 3D printing and preparation method thereof
Technical Field
The invention relates to the field of building 3D printing and waste recycling, in particular to high-ductility fiber reinforced recycled mortar for building 3D printing and a preparation method thereof.
Background
The 3D printing technology is additive manufacturing technology, the manufacturing of the solid structure is completed in a mode of overlapping the materials layer by layer, and the method has the advantages of no need of a mold, shortening of the manufacturing period, reduction of the cost and the like. The building 3D printing is an intelligent construction technology which takes mortar or concrete as an ink material and applies a 3D printing technology to the field of building engineering. The application of the 3D printing technology in the field of buildings can not only greatly reduce the construction cost and improve the construction efficiency, but also improve the safety, applicability and accuracy of construction, and simultaneously enable a complex construction form to be possible.
Meanwhile, China is still in the peak period of infrastructure, and the demand of building materials and the discharge of building wastes are huge. In 2017, more than 20 hundred million tons of building wastes are generated in China, wherein the content of the waste concrete is about 40 percent at most, the waste concrete is crushed and processed into recycled aggregate to be made into recycled concrete, the recycling utilization rate of the waste concrete in most developed countries can reach more than 90 percent, and in China, although the industry is developed for over a decade, the recycling utilization rate is still less than 10 percent. The recycled concrete is applied to 3D printing, and a chance is brought to the further development of the construction waste recycling industry.
However, most of the architectural 3D printed works are currently staying in the laboratory. The reason is that the reliability of the building 3D printing component cannot be fundamentally solved, and particularly the defects of large brittleness and poor ductility of a building 3D printing structure cannot be effectively solved, so that further popularization and application of building 3D printing are restricted.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide high-ductility fiber-reinforced recycled mortar for 3D printing of buildings and a preparation method thereof, and overcomes the defects of low ductility, brittle failure and the like of the existing 3D printing materials for buildings. Meanwhile, the 3D printing recycled mortar uses a large amount of fly ash, recycled sand and recycled PET short fibers, so that waste resources can be recycled, and the 3D printing recycled mortar has high environmental benefit and social benefit.
Specifically, the technical scheme of the invention is as follows:
the invention discloses a high-ductility fiber reinforced recycled mortar for building 3D printing, which comprises the following components in parts by weight:
cement: 550-800 parts;
fly ash: 200-450 parts;
reclaimed sand: 1000 parts of (A);
regeneration of PET short fiber: 10-16 parts;
defoaming agent: 1.0-1.5 parts;
water reducing agent: 0.5-3.8 parts;
sodium gluconate: 0.5-0.7 part;
nano clay: 4.0-7.0 parts;
cellulose: 1.1-1.6 parts;
water: 300-600 parts.
Preferably, the cement is P.O 42.5.5 ordinary portland cement, and the fly ash is grade I low-calcium fly ash.
Preferably, the preparation method of the reclaimed sand comprises the following steps: and (3) crushing the waste building concrete into particles with the particle size of 1.25-4.75 mm to obtain the reclaimed sand.
In some embodiments of the invention, the reclaimed sand has a relatively high water absorption of 5% to 20%. The water absorption of the reclaimed sand is particularly considered in the preparation of high-ductility fiber-reinforced reclaimed mortar that can be used for 3D printing of buildings.
Assuming that cement, natural sand and water are respectively used in a construction 3D printing material formulation without reclaimed sand, the amounts of cement, natural sand and water are a, b and c, then when m% reclaimed sand is substituted for natural sand, and assuming that the water absorption of the reclaimed sand is n%, the amount of water used in the construction 3D printing material formulation will be W + c + b m% n%, and at the same time the water-cement ratio in the formulation will be a/(c + b m% n%).
Preferably, the regenerated PET short fiber is prepared by taking waste polyester as a raw material and adopting a regenerated bottle-grade polyester technology.
In some embodiments of the inventionIn the embodiment, the length of the regenerated PET short fiber is 6-18 mm, the titer can reach 5555dtxt, and the tensile strength can reach 450N/mm2The stretching rate can reach 17 percent.
Preferably, the high-ductility fiber reinforced recycled mortar for building 3D printing comprises any one or more of the following conditions:
1) the defoaming agent is a special defoaming agent for concrete;
2) the water reducing agent is a polycarboxylic acid water reducing agent;
3) the sodium gluconate is sodium gluconate for concrete;
4) the nano clay is nano purified attapulgite clay powder for concrete;
5) the cellulose is carboxymethyl cellulose or lignocellulose.
Preferably, the water is tap water.
The invention discloses a method for preparing high-ductility fiber-reinforced recycled mortar for building 3D printing, which comprises the following steps:
step one, mixing cement and reclaimed sand and stirring the mixture uniformly to obtain a mixture I;
step two, mixing a defoaming agent, a water reducing agent, sodium gluconate, nano clay and cellulose, and placing the mixture in the mixture I in the step one to be uniformly stirred to obtain a mixture II;
step three, mixing the mixture II in the step two with water and stirring the mixture II and the water uniformly to obtain a mixture III;
and step four, mixing the dispersed regenerated PET short fibers with the mixture III in the step three, and stirring the mixture to be uniform to obtain the high-ductility fiber reinforced regenerated mortar for 3D printing of buildings.
Preferably, in the first, second and third steps, the stirring conditions are as follows: the stirring speed is 800-1200rpm, and the stirring time is 2-5 min.
Preferably, in the fourth step, the regenerated PET staple fibers are mixed in multiple steps; the stirring conditions in the fourth step are as follows: the stirring speed is 300-1200rpm, and the stirring time is 10-20 min.
The third aspect of the invention discloses application of the high-ductility fiber-reinforced recycled mortar for building 3D printing or the preparation method in the field of recycled materials.
On the basis of the common general knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily without departing from the concept and the protection scope of the invention.
Compared with the prior art, the invention has the following remarkable advantages and effects:
according to the invention, the recycled PET short fibers are doped into the building 3D printing mortar and are adjusted by being supplemented with additives, so that the material not only meets the requirements of pumpability, extrudability and constructability of the building 3D printing ink, but also has the advantage of high ductility. The building 3D printing regenerated mortar material solves the problems of poor ductility and brittle failure of a building 3D printing material in the conventional reinforcement-free construction, and is beneficial to the conversion of a building 3D printing technology from a laboratory stage to an engineering application stage; meanwhile, the 3D printing recycled mortar uses a large amount of fly ash, recycled sand and recycled PET short fibers, takes resource recycling of wastes into consideration, and has high environmental benefit and social benefit.
Drawings
FIG. 1 is a schematic diagram of a 3D printing process of a high-ductility fiber reinforced recycled mortar for building 3D printing disclosed in an embodiment of the invention;
FIG. 2 is a schematic diagram of a four-point bend test piece prepared from a high-ductility fiber-reinforced recycled mortar for architectural 3D printing disclosed in an embodiment of the present invention;
FIG. 3 is a schematic diagram comparing four-point bending force-displacement curves of a high-ductility fiber-reinforced recycled mortar test piece for building 3D printing and a common building-capable 3D printing mortar test piece, which are disclosed in the embodiment of the invention;
fig. 4 is a schematic drawing comparing tensile force-displacement curves of a high-ductility fiber-reinforced recycled mortar dog-bone test piece for building 3D printing and a common building-capable 3D printing mortar dog-bone test piece disclosed in the embodiment of the invention.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to the drawings and the embodiments, but the present invention is not limited to the scope of the embodiments.
The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions. The reagents and starting materials used in the present invention are commercially available.
Example 1
The high-ductility fiber-reinforced recycled mortar for 3D printing of buildings and the preparation method thereof comprise the following components in parts by weight: 800 parts of cement, 200 parts of fly ash, 1000 parts of reclaimed sand, 10 parts of reclaimed PET short fibers, 1 part of defoaming agent, 1.2 parts of water reducing agent, 0.7 part of sodium gluconate, 5 parts of nano clay, 1.2 parts of cellulose and 425 parts of water.
Wherein, the cement is P.O 42.5.5 ordinary portland cement; the reclaimed sand is particles with the particle size of 1.25mm-4.75mm, and the water absorption rate of the reclaimed sand is 5% -15%; the regenerated PET short fiber comprises various lengths of 6-18 mm and the like; the defoaming agent is a special defoaming agent for concrete, the water reducing agent is a polycarboxylic acid water reducing agent, the sodium gluconate is sodium gluconate for concrete, the nano clay is nano purified attapulgite clay powder for concrete, and the cellulose is carboxypropyl methyl cellulose or lignocellulose; the water is ordinary tap water.
The preparation method of the high-ductility fiber-reinforced recycled mortar for building 3D printing comprises the following steps: step one, mixing cement and reclaimed sand and stirring the mixture uniformly to obtain a mixture I;
step two, mixing a defoaming agent, a water reducing agent, sodium gluconate, nano clay and cellulose, and placing the mixture in the mixture I in the step one to be uniformly stirred to obtain a mixture II;
step three, mixing the mixture II in the step two with water and stirring the mixture II and the water uniformly to obtain a mixture III;
and step four, mixing the dispersed regenerated PET short fibers with the mixture III in the step three, and stirring the mixture to be uniform to obtain the high-ductility fiber reinforced regenerated mortar for 3D printing of buildings.
Wherein, in the first step, the second step and the third step, the stirring speed is 800-; in the fourth step, the mixing mode of the regenerated PET short fibers is multi-time step-by-step mixing, the stirring speed during stirring is 300-1200rpm, and the stirring time is 10-20 min.
Example 2
The high-ductility fiber-reinforced recycled mortar for 3D printing of buildings and the preparation method thereof comprise the following components in parts by weight: 700 parts of cement, 300 parts of fly ash, 1000 parts of reclaimed sand, 13 parts of reclaimed PET short fibers, 1.1 parts of defoaming agent, 2.1 parts of water reducing agent, 0.75 part of sodium gluconate, 5.9 parts of nano clay, 1.26 parts of cellulose and 425 parts of water.
Wherein, the cement is P.O 42.5.5 ordinary portland cement; the reclaimed sand is particles with the particle size of 1.25mm-4.75mm, and the water absorption rate of the reclaimed sand is 5% -15%; the regenerated PET short fiber comprises various lengths of 6-18 mm and the like; the defoaming agent is a special defoaming agent for concrete, the water reducing agent is a polycarboxylic acid water reducing agent, the sodium gluconate is sodium gluconate for concrete, the nano clay is nano purified attapulgite clay powder for concrete, and the cellulose is carboxypropyl methyl cellulose or lignocellulose; the water is ordinary tap water.
The preparation method of the high-ductility fiber-reinforced recycled mortar for building 3D printing comprises the following steps: step one, mixing cement and reclaimed sand and stirring the mixture uniformly to obtain a mixture I;
step two, mixing a defoaming agent, a water reducing agent, sodium gluconate, nano clay and cellulose, and placing the mixture in the mixture I in the step one to be uniformly stirred to obtain a mixture II;
step three, mixing the mixture II in the step two with water and stirring the mixture II and the water uniformly to obtain a mixture III;
and step four, mixing the dispersed regenerated PET short fibers with the mixture III in the step three, and stirring the mixture to be uniform to obtain the high-ductility fiber reinforced regenerated mortar for 3D printing of buildings.
Wherein, in the first step, the second step and the third step, the stirring speed is 800-; in the fourth step, the mixing mode of the regenerated PET short fibers is multi-time step-by-step mixing, the stirring speed during stirring is 300-1200rpm, and the stirring time is 10-20 min.
Example 3
The high-ductility fiber-reinforced recycled mortar for 3D printing of buildings and the preparation method thereof comprise the following components in parts by weight: 600 parts of cement, 400 parts of fly ash, 1000 parts of reclaimed sand, 16 parts of reclaimed PET short fibers, 1.3 parts of defoaming agent, 3.3 parts of water reducing agent, 0.85 part of sodium gluconate, 6.7 parts of nano clay, 1.38 parts of cellulose and 425 parts of water.
Wherein, the cement is P.O 42.5.5 ordinary portland cement; the reclaimed sand is particles with the particle size of 1.25mm-4.75mm, and the water absorption rate of the reclaimed sand is 5% -15%; the regenerated PET short fiber comprises various lengths of 6-18 mm and the like; the defoaming agent is a special defoaming agent for concrete, the water reducing agent is a polycarboxylic acid water reducing agent, the sodium gluconate is sodium gluconate for concrete, the nano clay is nano purified attapulgite clay powder for concrete, and the cellulose is carboxypropyl methyl cellulose or lignocellulose; the water is ordinary tap water.
The preparation method of the high-ductility fiber-reinforced recycled mortar for building 3D printing comprises the following steps: step one, mixing cement and reclaimed sand and stirring the mixture uniformly to obtain a mixture I;
step two, mixing a defoaming agent, a water reducing agent, sodium gluconate, nano clay and cellulose, and placing the mixture in the mixture I in the step one to be uniformly stirred to obtain a mixture II;
step three, mixing the mixture II in the step two with water and stirring the mixture II and the water uniformly to obtain a mixture III;
and step four, mixing the dispersed regenerated PET short fibers with the mixture III in the step three, and stirring the mixture to be uniform to obtain the high-ductility fiber reinforced regenerated mortar for 3D printing of buildings.
Wherein, in the first step, the second step and the third step, the stirring speed is 800-; in the fourth step, the mixing mode of the regenerated PET short fibers is multi-time step-by-step mixing, the stirring speed during stirring is 300-1200rpm, and the stirring time is 10-20 min.
Comparative example 1
The common building 3D printing mortar comprises the following components in parts by weight: 1000 parts of cement, 1000 parts of natural sand, 1.5 parts of a water reducing agent, 0.5 part of sodium gluconate, 3.5 parts of nano clay and 370 parts of water. Wherein, the cement is P.O 42.5.5 ordinary portland cement; the natural sand is natural fine sand, the average grain diameter is 0.25mm-0.35mm, and the water content of the natural fine sand is 4% -6%; the water reducing agent is a polycarboxylic acid water reducing agent, the sodium gluconate is sodium gluconate for concrete, and the nano clay is nano purified attapulgite clay powder for concrete; the water is ordinary tap water. The preparation method of the common building 3D printing mortar comprises the following steps: step one, mixing and stirring cement, natural sand, a water reducing agent, sodium gluconate and nano clay uniformly; and step two, mixing the mixture obtained in the step one with water and uniformly stirring to obtain the common building 3D printing mortar. Wherein, in the first and second steps, the stirring speed is 800-1200rpm, and the stirring time is 3-7 min.
Comparative example 2
The common building 3D printing mortar comprises the following components in parts by weight: 1000 parts of cement, 900 parts of natural sand, 100 parts of reclaimed sand, 1.5 parts of water reducing agent, 0.5 part of sodium gluconate, 3.5 parts of nano clay and 380 parts of water. Wherein, the cement is P.O 42.5.5 ordinary portland cement; the natural sand is natural fine sand, the average grain diameter is 0.25mm-0.35mm, and the water content of the natural fine sand is 4% -6%; the reclaimed sand is particles with the particle size of 1.25mm-4.75mm which are obtained by crushing the building waste, the building waste is waste concrete, and the water absorption rate of the reclaimed sand is 5% -15%; the water reducing agent is a polycarboxylic acid water reducing agent, the sodium gluconate is sodium gluconate for concrete, and the nano clay is nano purified attapulgite clay powder for concrete; the water is ordinary tap water. The preparation method of the common building 3D printing mortar comprises the following steps: step one, mixing and stirring cement, natural sand, a water reducing agent, sodium gluconate and nano clay uniformly; and step two, mixing the mixture obtained in the step one with water and uniformly stirring to obtain the common building 3D printing mortar. Wherein, in the first and second steps, the stirring speed is 800-1200rpm, and the stirring time is 3-7 min.
Comparative example 3
The common building 3D printing mortar comprises the following components in parts by weight: 1000 parts of cement, 800 parts of natural sand, 200 parts of reclaimed sand, 1.5 parts of water reducing agent, 0.5 part of sodium gluconate, 3.5 parts of nano clay and 390 parts of water. Wherein, the cement is P.O 42.5.5 ordinary portland cement; the natural sand is natural fine sand, the average grain diameter is 0.25mm-0.35mm, and the water content of the natural fine sand is 4% -6%; the reclaimed sand is particles with the particle size of 1.25mm-4.75mm which are obtained by crushing the building waste, the building waste is waste concrete, and the water absorption rate of the reclaimed sand is 5% -15%; the water reducing agent is a polycarboxylic acid water reducing agent, the sodium gluconate is sodium gluconate for concrete, and the nano clay is nano purified attapulgite clay powder for concrete; the water is ordinary tap water. The preparation method of the common building 3D printing mortar comprises the following steps: step one, mixing and stirring cement, natural sand, a water reducing agent, sodium gluconate and nano clay uniformly; and step two, mixing the mixture obtained in the step one with water and uniformly stirring to obtain the common building 3D printing mortar. Wherein, in the first and second steps, the stirring speed is 800-1200rpm, and the stirring time is 3-7 min.
Example 4
The high-ductility fiber reinforced recycled mortar materials prepared in examples 1 to 3 and used for 3D printing of buildings and the common 3D printing mortar prepared in comparative examples 1 to 3 were printed layer by a 3D printer according to a specifically set programming procedure, and high-ductility fiber reinforced recycled mortar component samples for 3D printing construction were obtained. Fig. 1 shows a schematic diagram of a 3D printing process, wherein a sample of the printed recycled mortar component is shown in fig. 2 (the left drawing in fig. 2 is a front view of the printed recycled mortar component, and the right drawing is a back view of the printed recycled mortar component), using the high-ductility fiber reinforced recycled mortar material for 3D printing of buildings obtained in example 1 as a raw material. And curing the high-ductility fiber reinforced recycled mortar component sample constructed by 3D printing in a standard curing mode, wherein the temperature of the standard curing is 18-22 ℃, the humidity of the standard curing is 90-95%, and the curing age of the standard curing is 28 days. The test conditions and curing method were identical except for the mortar material.
The mortar member samples were subjected to fracture mode, breaking strength, and tensile strength tests, and ductility evaluations, and the test results are shown in table 1.
TABLE 1 evaluation of failure mode, flexural strength, tensile strength and ductility of different types of 3D-printed mortar samples
Ductility tests were performed on the samples of the recycled mortar members prepared using the high ductility fiber reinforced recycled mortar disclosed in example 3 and comparative example 3 as raw materials, and the results are shown in fig. 3 and 4.
In conclusion, the invention provides high-ductility fiber-reinforced recycled mortar for building 3D printing and a preparation method thereof, and recycled PET short fibers are doped into a building 3D printing material and are adjusted by being supplemented with additives, so that the material not only meets the requirements of pumpability, extrudability and constructability of the building 3D printing ink, but also has the advantage of high ductility. The 3D printing recycled mortar solves the problems of poor ductility and brittle failure of a 3D printing material of a building in the conventional reinforcement-free construction, and is beneficial to the conversion of a 3D printing technology of the building from a laboratory stage to an engineering application stage; meanwhile, the 3D printing recycled mortar uses a large amount of fly ash, recycled sand and recycled PET short fibers, takes resource recycling of wastes into consideration, and has high environmental benefit and social benefit.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. The high-ductility fiber-reinforced recycled mortar for 3D printing of buildings is characterized by comprising the following components in parts by weight:
cement: 550-800 parts;
fly ash: 200-450 parts;
reclaimed sand: 1000 parts of (A);
regeneration of PET short fiber: 10-16 parts;
defoaming agent: 1.0-1.5 parts;
water reducing agent: 0.5-3.8 parts;
sodium gluconate: 0.5-0.7 part;
nano clay: 4.0-7.0 parts;
cellulose: 1.1-1.6 parts;
water: 300-600 parts.
2. The high-ductility fiber reinforced recycled mortar for building 3D printing according to claim 1, wherein the cement is P.O 42.5.5 ordinary portland cement, and the fly ash is I-grade low-calcium fly ash.
3. The high-ductility fiber-reinforced recycled mortar for building 3D printing according to claim 1, wherein the preparation method of the recycled sand comprises the following steps: and (3) crushing the waste building concrete into particles with the particle size of 1.25-4.75 mm to obtain the reclaimed sand.
4. The high-ductility fiber-reinforced recycled mortar for building 3D printing according to claim 1, wherein the recycled PET short fibers are prepared from waste polyester by a recycled bottle-grade polyester technology.
5. The high-ductility fiber-reinforced recycled mortar for building 3D printing according to claim 1, wherein any one or more of the following conditions are included:
1) the defoaming agent is a special defoaming agent for concrete;
2) the water reducing agent is a polycarboxylic acid water reducing agent;
3) the sodium gluconate is sodium gluconate for concrete;
4) the nano clay is nano purified attapulgite clay powder for concrete;
5) the cellulose is carboxymethyl cellulose or lignocellulose.
6. The high-ductility fiber reinforced recycled mortar for building 3D printing according to claim 1, wherein the water is tap water.
7. A preparation method of high-ductility fiber-reinforced recycled mortar for building 3D printing is characterized by comprising the following steps:
step one, mixing cement and reclaimed sand and stirring the mixture uniformly to obtain a mixture I;
step two, mixing a defoaming agent, a water reducing agent, sodium gluconate, nano clay and cellulose, and placing the mixture in the mixture I in the step one to be uniformly stirred to obtain a mixture II;
step three, mixing the mixture II in the step two with water and stirring the mixture II and the water uniformly to obtain a mixture III;
and step four, mixing the dispersed regenerated PET short fibers with the mixture III in the step three, and stirring the mixture to be uniform to obtain the high-ductility fiber reinforced regenerated mortar for 3D printing of buildings.
8. The method of claim 7, wherein in steps one, two and three, the conditions of agitation are: the stirring speed is 800-1200rpm, and the stirring time is 2-5 min.
9. The method according to claim 7, wherein in the fourth step, the regenerated PET short fibers are mixed in a plurality of steps; the stirring conditions in the fourth step are as follows: the stirring speed is 300-1200rpm, and the stirring time is 10-20 min.
10. Use of the high-ductility fiber-reinforced recycled mortar for architectural 3D printing according to claims 1 to 6 or the method of claims 7 to 9 in the field of recycled materials.
CN201911399186.1A 2019-12-30 2019-12-30 High-ductility fiber-reinforced recycled mortar for building 3D printing and preparation method thereof Pending CN111138134A (en)

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