CN111302742A - UHPC (ultra high Performance polycarbonate) capable of being printed in 3D (three-dimensional) based on regenerated glass sand and preparation method thereof - Google Patents
UHPC (ultra high Performance polycarbonate) capable of being printed in 3D (three-dimensional) based on regenerated glass sand and preparation method thereof Download PDFInfo
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- CN111302742A CN111302742A CN202010297395.1A CN202010297395A CN111302742A CN 111302742 A CN111302742 A CN 111302742A CN 202010297395 A CN202010297395 A CN 202010297395A CN 111302742 A CN111302742 A CN 111302742A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE 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
- B33Y70/00—Materials specially adapted for additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention relates to the field of building 3D printing and waste recycling, in particular to UHPC (ultra high performance polycarbonate) capable of 3D printing based on recycled glass sand and a preparation method thereof. The 3D printable UHPC based on the recycled glass sand comprises the following components in parts by weight: cement: 700 portions and 900 portions; silica fume: 150 and 270 parts; fly ash: 150-250 parts; regenerating glass sand: 800-1000 parts; steel fiber: 8-19 parts; water reducing agent: 9.2-18.1 parts; nano clay: 3.9-11.5 parts; cellulose: 0.8-4.7 parts; water: 150 portion to 350 portions. The UHPC capable of being printed in 3D based on the regenerated glass sand overcomes the defects of low mechanical property and durability of the existing building 3D printing material. Meanwhile, the 3D printing UHPC uses the recycled glass sand, the silica fume and the fly ash, realizes the resource recycling of wastes, and has higher environmental benefit and social benefit.
Description
Technical Field
The invention relates to the field of building 3D printing and waste recycling, in particular to UHPC (ultra high performance polycarbonate) capable of 3D printing based on recycled glass sand and a preparation method thereof.
Background
The 3D printed concrete is an intelligent construction technology which takes concrete as a printing ink material and applies a 3D printing technology to the field of constructional engineering. The 3D printing technology completes the manufacture of the solid structure in a mode of overlapping materials layer by layer, and has the advantages of no need of a mold, shortened manufacturing period, reduced cost and the like. 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, stability and accuracy of construction, and simultaneously enable a complex construction form to be possible.
However, most architectural 3D printing currently stays in the laboratory phase. The reason for this is that most of the currently used building 3D printing ink is mainly mortar, and the mechanical properties and durability of the printed member are low and cannot meet the existing building use standards, thereby restricting the practical application of building 3D printing.
Meanwhile, China is still in the peak period of infrastructure, the demand of building materials and the discharge of building wastes are huge, so that a large amount of natural resources are consumed, and immeasurable environmental pollution is caused. In addition, the treatment of the waste glass is also a big problem in China, if the waste glass is graded, ground and recombined according to different scales to obtain the regenerated glass sand with the particle composition meeting the requirements of UHPC homogeneity and optimal density, the regenerated glass sand is used for replacing quartz sand and is applied to 3D printing as a building material, resources can be saved, pollution can be reduced, and the opportunity is brought to the further development of the building 3D printing industry and the waste recycling industry.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a UHPC (ultra high performance concrete) capable of being printed in a 3D mode based on recycled glass sand and a preparation method thereof, and overcomes the defects of low mechanical property and durability of the existing building 3D printing material. Meanwhile, the 3D printing UHPC uses the recycled glass sand, the silica fume and the fly ash, realizes the resource recycling of wastes, and has higher environmental benefit and social benefit.
Specifically, the technical scheme of the invention is as follows:
the invention discloses a UHPC (ultra high performance polycarbonate) capable of being printed in 3D based on recycled glass sand, which comprises the following components in parts by weight:
cement: 700 portions and 900 portions;
silica fume: 150 and 270 parts;
fly ash: 150-250 parts;
regenerating glass sand: 800-1000 parts;
steel fiber: 8-19 parts;
water reducing agent: 9.2-18.1 parts;
nano clay: 3.9-11.5 parts;
cellulose: 0.8-4.7 parts;
water: 150 portion to 350 portions.
Preferably, the cement is P.I. 62.5-grade portland cement which is good in compatibility with a polycarboxylic acid water reducer; the silica fume conforms to the specification of CAN/CSA A3000 standard; the fly ash is I-grade low-calcium fly ash.
Preferably, the recycled glass sand is obtained by crushing and grinding waste glass, and 3 scale intervals are obtained during grinding: the particle size of the coarse sand in the S1 scale interval is between 320 and 600 microns; the grain size of the medium sand in the S2 scale interval is between 160 and 320 microns; fine sand in the S3 scale interval, wherein the grain size is 80-160 microns;
preferably, the content of silica in the regenerated glass sand is 72.3 percent, the content of sodium oxide is 15.2 percent, and the density is 2.63g/cm3The firmness index is less than 5.0%.
Preferably, the combination of the regenerated glass sands in the scale intervals of S1, S2 and S3 is a combination of the optimal packing density obtained after calculating the ternary combination packing density based on the Sedran and Delarrard equations (refer to Larrard F D, Sedran T. optimization of ultra-high-performance packing by the use of packing model [ J ]. center and ConcretResearch, 1994,24(6): 997-; preferably, the ratio of each scale interval of the combination is S1: s2: s3: 1.6:5.3: 3.1.
Preferably, the particle size distribution of the regenerated glass sand combined in the optimal packing density combination mode is close to the aggregate distribution of high-quality quartz sand, and the sand using standard for configuring high-performance concrete is met.
Preferably, the steel fiber is copper-plated flat steel fiber, the diameter is 0.19mm-0.23mm, the length is 6mm-18mm, and the tensile strength is 2500MPa-3000 MPa.
Preferably, the 3D printable UHPC based on recycled glass sand comprises any one or more of the following conditions:
1) the water reducing agent is a polycarboxylic acid high-performance water reducing agent with the density of 1.09g/cm3The solid content is 40 percent;
2) the nano clay is nano purified attapulgite clay powder for concrete;
3) the cellulose is carboxymethyl cellulose or lignocellulose.
4) The water is tap water.
The invention discloses a preparation method of UHPC based on recycled glass sand and capable of realizing 3D printing, which comprises the following steps: step one, mixing cement, silica fume, fly ash, regenerated glass sand, steel fiber, nano clay and cellulose in proportion and stirring the mixture uniformly to obtain a mixture I; and step two, uniformly mixing the water reducing agent and water in proportion, adding the mixture into the mixture I for three times, and stirring until the mixture is uniform, thus obtaining the UHPC (ultra high Performance polycarbonate) mixture capable of being printed in 3D based on the regenerated glass sand.
Preferably, in the first step and the second step, the stirring conditions are as follows: the stirring speed is 650 plus 1000rpm, and the stirring time is 3-10 min.
The obtained 3D printable UHPC (ultra high Performance polycarbonate) mixture based on the regenerated glass sand is subjected to fluidity and yield stress tests in a fresh mixing state, and is subjected to printing quality, shape stability and printing window evaluation, so that the mixture can meet the requirements of 3D printing.
The obtained 3D printable UHPC (ultra high Performance polycarbonate) mixture based on the regenerated glass sand is subjected to mechanical property test and durability evaluation in a 28-day hardening state, and is used for ensuring that the mixture meets the requirements of high-performance concrete.
The third aspect of the invention discloses the application of the UHPC capable of being printed in 3D mode based on the recycled glass sand or the preparation method in the 3D printing field and the recycled material field.
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:
the invention obtains the specific particle combination by carrying out multi-scale grinding on the regenerated glass sand and adopting Sedran and De Larrard equation calculation, realizes the optimal bulk density, leads the optimized regenerated glass sand to be matched with high-quality quartz sand in a matching way, and further meets the sand using standard for configuring high-performance concrete. Meanwhile, the additive is added for adjustment, so that the material meets the requirements of pumpability, extrudability and constructability of the building 3D printing ink, and the UHPC capable of being printed in 3D based on the regenerated glass sand is obtained, and has higher environmental benefit and social benefit.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to examples, but the present invention is not limited to the scope of the examples.
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
A3D printable UHPC based on recycled glass sand comprises the following components in parts by weight: 800 parts of cement, 200 parts of silica fume, 200 parts of fly ash, 160 parts of 50-150 micron regenerated glass sand, 530 parts of 150-350 micron regenerated glass sand, 310 parts of 350-650 micron regenerated glass sand, 15 parts of steel fiber, 15.3 parts of water reducing agent, 8.7 parts of nano clay, 2.1 parts of cellulose and 275 parts of water.
Wherein the cement is P.I. 62.5-grade portland cement; the silica fume accords with the specification of CAN/CSA 3000 standard; the fly ash is I-grade low-calcium fly ash; the content of silica in the regenerated glass sand is 72.3 percent, the content of sodium oxide is 15.2 percent, and the density is 2.63g/cm3The firmness index is less than 5.0 percent, the combination is carried out according to the optimal packing density combination mode, the grain composition is close to high-quality quartz sand, and the sand using standard for preparing high-performance concrete is met; the steel fiber is copper-plated flat steel fiber with the diameter of 0.2mm, the length of 6mm-18mm and other lengths, and the tensile strength of 2800 MPa; the water reducing agent is a polycarboxylic acid water reducing agent, and the nano clay is used for concreteNano purified attapulgite clay powder, wherein the cellulose is carboxymethyl cellulose; the water is ordinary tap water.
The preparation method of the UHPC based on the recycled glass sand and capable of being printed in 3D comprises the following steps: step one, mixing cement, silica fume, fly ash, regenerated glass sand, steel fiber, nano clay and cellulose in proportion and stirring the mixture uniformly to obtain a mixture I; and step two, uniformly mixing the water reducing agent and water in proportion, adding the mixture into the mixture I for three times, and stirring until the mixture is uniform, thus obtaining the UHPC (ultra high Performance polycarbonate) mixture capable of being printed in 3D based on the regenerated glass sand. Wherein, in the first step and the second step, the stirring conditions are as follows: the stirring speed is 650 plus 1000rpm, and the stirring time is 3-10 min.
Comparative example 1
A quartz sand based UHPC capable of being 3D printed comprises the following components in parts by weight: 800 parts of cement, 200 parts of silica fume, 200 parts of fly ash, 1000 parts of quartz sand, 15 parts of steel fiber, 15.3 parts of water reducing agent, 8.7 parts of nano clay, 2.1 parts of cellulose and 275 parts of water.
Wherein the cement is P.I. 62.5-grade portland cement; the silica fume accords with the specification of CAN/CSA 3000 standard; the fly ash is I-grade low-calcium fly ash; the quartz sand is high-quality quartz sand with good gradation and SiO2The content is more than 96 percent, the maximum grain diameter is 600 microns, and the standard of using sand prepared by UHPC is met; the steel fiber is copper-plated flat steel fiber with the diameter of 0.2mm, the length of 6mm-18mm and other lengths, and the tensile strength of 2800 MPa; the water reducing agent is a polycarboxylic acid water reducing agent, the nano clay is nano purified attapulgite clay powder for concrete, and the cellulose is carboxymethyl cellulose; the water is ordinary tap water.
The preparation method of the quartz sand-based UHPC capable of being printed in 3D comprises the following steps: step one, mixing cement, silica fume, fly ash, quartz sand, steel fiber, nano clay and cellulose in proportion and stirring uniformly to obtain a mixture I; and step two, uniformly mixing the water reducing agent and water in proportion, adding the mixture into the mixture I for three times, and stirring until the mixture is uniform, thus obtaining the quartz sand-based UHPC (ultra high Performance polycarbonate) mixture capable of being printed in 3D. Wherein, in the first step and the second step, the stirring conditions are as follows: the stirring speed is 650 plus 1000rpm, and the stirring time is 3-10 min.
Comparative example 2
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 800-1000rpm, and the stirring time is 3-7 min.
Comparative example 3
The common building C30 concrete comprises the following components in parts by weight: 461 parts of cement, 512 parts of natural sand, 1252 parts of stones and 175 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 stones are common broken stones; the water is ordinary tap water. The preparation method of the common building C30 concrete comprises the following steps: step one, mixing cement, natural sand and stones and stirring the mixture until the mixture is uniform; and step two, mixing the mixture obtained in the step one with water and uniformly stirring to obtain the common building C30 concrete. Wherein, in the first and second steps, the stirring speed is 500-1200rpm, and the stirring time is 1-7 min.
Comparative example 4
The building C100 concrete comprises the following components in parts by weight: 568 parts of cement, 322 parts of natural sand, 625 parts of stones, 36 parts of fly ash, 22 parts of silica fume, 8 parts of water reducing agent and 246 parts of water. Wherein, the cement is P.O 62.5.5-grade portland cement; the natural sand is natural river sand, the fineness modulus is 2.6-2.8, and the water content of the natural fine sand is 4% -6%; the stones are the mixture of limestone with hard texture and good grain shape and pebbles; the water reducing agent is a polycarboxylic acid water reducing agent; the water is ordinary tap water. The preparation method of the building C100 concrete comprises the following steps: step one, mixing and stirring cement, natural sand, pebbles, fly ash, silica fume and a water reducing agent to be uniform; and step two, mixing the mixture obtained in the step one with water and uniformly stirring to obtain the building C100 concrete. Wherein, in the first and second steps, the stirring speed is 500-1200rpm, and the stirring time is 1-7 min.
The 3D printable UHPC based on recycled glass sand prepared in example 1 and the 3D printable UHPC based on quartz sand prepared in comparative examples 1 to 4, the 3D printable recycled mortar for general buildings, the C30 concrete for general buildings and the C100 concrete for buildings were respectively subjected to layer-by-layer printing or mixing pouring by a 3D printer according to a specifically set programming procedure to obtain component samples of each example and comparative example. And maintaining each component sample in a standard maintenance mode, wherein the temperature of the standard maintenance is 18-22 ℃, the humidity of the standard maintenance is 90-95%, and the maintenance age of the standard maintenance is 28 days. The test conditions and curing method were identical except for the material differences.
Mechanical properties, durability and 3D printability of each of the above member samples were tested and evaluated, and the test and evaluation results are shown in tables 1 and 2.
TABLE 1 evaluation of mechanical Properties and durability
TABLE 2 3D printability assessment
As can be seen from tables 1 and 2, the 3D printable UHPC performance based on recycled glass sand obtained in example 1 is significantly better than that of the control group.
In summary, the invention provides a UHPC (ultra high performance polycarbonate) capable of being printed in 3D (three-dimensional) mode based on recycled glass sand and a preparation method thereof, wherein the recycled glass sand is subjected to multi-scale grinding and calculated by Sedran and De Larrard equations to obtain a specific particle combination, the optimal packing density is realized, the optimized recycled glass sand is assembled and matched to be close to high-quality quartz sand, and the sand using standard for configuring high-performance concrete is met. Meanwhile, the material is adjusted by being assisted with additives, so that the material meets the requirements of pumpability, extrudability and constructability of building 3D printing ink, obtains the UHPC based on the recycled glass sand and capable of 3D printing, and has higher 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 (9)
1. A UHPC (ultra high Performance polycarbonate) capable of being printed in a 3D mode based on recycled glass sand is characterized by comprising the following components in parts by weight:
cement: 700 portions and 900 portions;
silica fume: 150 and 270 parts;
fly ash: 150-250 parts;
regenerating glass sand: 800-1000 parts;
steel fiber: 8-19 parts;
water reducing agent: 9.2-18.1 parts;
nano clay: 3.9-11.5 parts;
cellulose: 0.8-4.7 parts;
water: 150 portion to 350 portions.
2. The UHPC based on the recycled glass sand and capable of being printed in 3D mode according to the claim 1, wherein the cement is P.I 62.5-grade portland cement which has good compatibility with a polycarboxylic acid water reducer; the silica fume conforms to the specification of CAN/CSA A3000 standard; the fly ash is I-grade low-calcium fly ash.
3. 3D printable UHPC based on recycled glass sand according to claim 1, characterized in that preferably the recycled glass sand is obtained by crushing and grinding waste glass, and in the grinding time, 3 dimension intervals are selected: the particle size of the coarse sand in the S1 scale interval is between 350 and 600 microns; the grain size of the medium sand in the S2 scale interval is between 150 and 350 microns; fine sand in the S3 scale interval, wherein the particle size is between 50 and 150 microns;
preferably, the content of silica in the regenerated glass sand is 72.3 percent, the content of sodium oxide is 15.2 percent, and the density is 2.2g/cm3The firmness index is less than 5.0%.
4. The UHPC based on recycled glass sand capable of being printed in 3D mode according to claim 1, wherein the combination mode of the recycled glass sand in the scale intervals of S1, S2 and S3 is a combination mode of obtaining the optimal packing density after calculating the ternary combination packing density based on Sedran and De Larrard equations;
preferably, the ratio of each scale interval of the combination is S1: s2: s3 ═ 1.6:5.3: 3.1;
preferably, the particle size distribution of the regenerated glass sand combined in the optimal packing density combination mode is close to the aggregate distribution of high-quality quartz sand, and the sand using standard for configuring the ultra-high performance concrete is met.
5. 3D printable UHPC based on recycled glass sand according to claim 1, characterized in that the steel fibres are copper plated flat steel fibres with a diameter of 0.19-0.23 mm, a length of 6-18 mm and a tensile strength of 2500-3000 MPa.
6. 3D printable UHPC based on recycled glass-sand according to claim 1, characterized in that it comprises any one or more of the following conditions:
1) the water reducing agent is a polycarboxylic acid high-performance water reducing agent with the density of 1.09g/cm3The solid content is 40 percent;
2) the nano clay is nano purified attapulgite clay powder for concrete;
3) the cellulose is carboxymethyl cellulose or lignocellulose.
4) The water is tap water.
7. A preparation method of UHPC capable of being printed in 3D based on recycled glass sand is characterized by comprising the following steps: step one, mixing cement, silica fume, fly ash, regenerated glass sand, steel fiber, nano clay and cellulose in proportion and stirring the mixture uniformly to obtain a mixture I; and step two, uniformly mixing the water reducing agent and water in proportion, adding the mixture into the mixture I for three times, and stirring until the mixture is uniform, thus obtaining the UHPC (ultra high Performance polycarbonate) mixture capable of being printed in 3D based on the regenerated glass sand.
8. The method according to claim 7, wherein the stirring conditions in the first and second steps are: the stirring speed is 650 plus 1000rpm, and the stirring time is 3-10 min.
9. Use of the recycled glass-sand based 3D printable UHPC according to any of claims 1 to 6 or the preparation process according to any of claims 7 to 8 in the field of 3D printing and in the field of recycled materials.
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