CN115819025B - Alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and preparation method thereof - Google Patents
Alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and preparation method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 109
- 239000011449 brick Substances 0.000 title claims abstract description 96
- 239000003513 alkali Substances 0.000 title claims abstract description 44
- 238000010146 3D printing Methods 0.000 title claims abstract description 38
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 31
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002699 waste material Substances 0.000 claims abstract description 30
- 239000010881 fly ash Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 21
- 239000011707 mineral Substances 0.000 claims abstract description 21
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 239000005060 rubber Substances 0.000 claims abstract description 18
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 230000003213 activating effect Effects 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 20
- 239000012190 activator Substances 0.000 claims description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 8
- -1 polypropylene Polymers 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical group OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 150000001413 amino acids Chemical class 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 229920003043 Cellulose fiber Polymers 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 230000005284 excitation Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 21
- 238000010276 construction Methods 0.000 abstract description 15
- 239000003469 silicate cement Substances 0.000 abstract description 4
- 239000004567 concrete Substances 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 19
- 239000004568 cement Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 10
- 239000011398 Portland cement Substances 0.000 description 9
- 238000007639 printing Methods 0.000 description 7
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 238000000498 ball milling Methods 0.000 description 5
- 239000002956 ash Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete additives, in particular to alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and a preparation method thereof, wherein the raw materials of the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing comprise mineral powder, modified sintered brick powder, fly ash, fine aggregate, alkali-activated agent, cellulose ether, fiber, rubber powder, water and polycarboxylate water reducer; the preparation method of the modified sintered brick powder comprises the steps of firstly cleaning, crushing and drying the waste bricks, then uniformly mixing the dried waste bricks, grinding aid and activating agent, and then grinding to obtain the modified sintered brick powder. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing has good printability, rheological property and interlayer bonding property, can better replace common silicate cement-based 3D printing materials, effectively reduces the consumption of silicate cement, reduces the cost of 3D printing materials, and is simple in construction.
Description
Technical Field
The invention relates to the field of building materials, in particular to alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and a preparation method thereof.
Background
As part of digital manufacturing, 3D printing technology has many advantages in the field of construction and architecture, has great potential for development, and has become a hotspot development direction in the building industry at present. However, the types of printing materials currently available are very limited, which severely hampers the development of the 3D printing building field. It is therefore a very important thing to develop materials that meet the requirements of the 3D printed building field. Good printing materials are a fundamental premise of 3D printing construction, which requires 3D printed concrete materials with good plasticity and high early strength.
In addition, the quantity of the Chinese construction waste accounts for more than 1/3 of the total quantity of the urban waste at present. In the next 10 years, more than 15 hundred million tons of building rubbish can be produced in China on average each year, and the storage amount of the building rubbish in China in 2020 reaches 237 hundred million tons, wherein the building waste bricks account for about 30% -50% of the building solid waste. At present, the building waste bricks are usually prepared into recycled coarse and fine aggregate, and are applied to engineering again, and the relative process is mature. However, the application of the sintered brick powder obtained directly or indirectly by crushing the construction waste bricks to prepare the recycled aggregate is relatively limited, and the sintered brick powder has the defects of poor particle type, large water demand, low gelation activity and the like due to the preparation process of the recycled aggregate. The stacking of the construction waste occupies a large amount of land resources, causes resource waste and has negative effects on economy, ecology and society. The recycling problem of the building waste bricks needs to be solved urgently.
Disclosure of Invention
In order to solve the problems that ordinary Portland cement is difficult to prepare and is suitable for 3D printing construction and waste bricks are piled up, the invention provides alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing, wherein raw materials comprise mineral powder, modified sintered brick powder, fly ash, fine aggregate, alkali-activated agent, cellulose ether, fiber, rubber powder, water and polycarboxylate water reducer;
the preparation method of the modified sintered brick powder comprises the steps of firstly cleaning, crushing and drying the waste bricks, then uniformly mixing the dried waste bricks, grinding aid and activating agent, and then grinding to obtain the modified sintered brick powder.
The modified sintered brick powder is formed by modifying abandoned bricks after construction removal, specifically, the abandoned bricks are cleaned and crushed to be smaller than 30mm in particle size and dried, and then the dried abandoned bricks, grinding aids and activating agents are mixed according to the mass ratio of 100-90: 1.0 to 0.8: 8-5, and by setting proper ball milling speed (100-270 r/min), ball milling time (30-60 min) and ball material ratio (15:1-8:1), and adopting a planetary ball mill to perform mechanical force activation, the obtained modified sintered brick powder has 28d volcanic ash activity reaching more than 80%, and the activity meeting and exceeding 70% mentioned in GBT 1596-2017 fly ash used in cement and concrete.
In addition, the 28d volcanic ash activity of the modified sintered brick powder obtained by the modification method can reach more than 80%, the use condition of the modified sintered brick powder can be met, and the waste bricks from different sources have a certain difference in production process or composition components, but the influence of the factors on the performance of the finished mortar finally prepared by the invention is small.
Based on the scheme, the grinding aid is Maveklin grinding aid, glycol and lignin sulfonate according to the mass ratio of 1.2-0.8:1-0.5:1-0.6; the activator is triethanolamine, magnesium oxide, calcium oxide and alkaline mineral salt according to the mass ratio of 1-0.6: 0.8 to 0.5:1.2 to 0.7:0.5 to 0.3.
Based on the scheme, the modified and sintered ceramic tile further comprises, by weight, 40-60 parts of mineral powder, 20-30 parts of modified and sintered ceramic tile powder, 15-30 parts of fly ash, 110-130 parts of fine aggregate, 8-12 parts of alkali-activated agent, 0.1-0.2 part of cellulose ether, 0.06-0.15 part of fiber, 0.13-0.2 part of rubber powder, 30-40 parts of water and 0.35-0.5 part of polycarboxylate water reducer.
On the basis of the scheme, further, the activity level of the mineral powder is not lower than the S95 level, and the alkalinity coefficient is >1 and the quality coefficient is >1.2.
On the basis of the scheme, the fly ash is further grade II fly ash.
On the basis of the scheme, the alkali-activated agent is industrial anhydrous sodium silicate with the molar weight of 1.0.
On the basis of the scheme, further, the cellulose ether is at least one of hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose ether.
Based on the scheme, the fiber is further polypropylene fiber or glass fiber, and the length of the fiber is in the range of 5-20 mm.
Based on the scheme, the molecular weight of the rubber powder is 1-10 ten thousand, 18 amino acids are contained, the moisture and inorganic salt content is below 16%, and the protein content is above 82%.
Based on the scheme, the polycarboxylate water reducer is further formed by compounding a polycarboxylate mother liquor, a retarder, a thickening agent and an air entraining agent, and the water reducing rate is 30-34%.
It should be noted that the polycarboxylic acid water reducer adopted in the invention mainly considers the water reducing performance, so that the use condition of the invention can be met by the water reducer with the water reducing rate within the range of 30% -34%, and specific preparation and composition of different water reducers can be adjusted or selected by a person skilled in the art, and are not repeated here.
The invention also provides a preparation method of the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing, which comprises the following steps:
(1) Uniformly stirring mineral powder, modified sintered brick powder, fly ash, fine aggregate, alkali-activated agent, cellulose ether, fiber and rubber powder to form a mixture A;
mixing a polycarboxylate water reducer with water, and uniformly stirring to obtain a mixed solution B;
(2) And pouring the mixture A into a stirrer to stir for 90-120 s, adding the mixed solution B, and stirring for 180-240 s to obtain the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing.
Compared with the prior art, the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing has the following technical principles and beneficial effects:
(1) The alkaline excitant can provide high concentration OH - for slurry, and the surface inactive bond of the modified sintered brick powder is easily converted into free unsaturated active bond under alkaline environment, namely, the surface S iO 2 and Si-O and A l-O bonds in Al 2O3 are broken to form Si-O-A l network polymer, the polymerization degree is reduced, and the modified sintered brick powder is easily subjected to pozzolan reaction with active ingredients in the system to generate C-S (A) -H gel with high strength and hydraulic property. The proper alkali-activator is doped into the modified sintered brick powder material, so that the colloid strength can be fully improved, and the performance of the modified sintered brick powder mortar is optimized.
(2) The waste building bricks are subjected to mechanochemical modification treatment, so that the volcanic ash activity of the brick powder is effectively improved, the utilization efficiency of the modified sintered brick powder is improved, a new alternative scheme can be provided for the mineral admixture which is in short supply, and the current situation of resource shortage is relieved.
(3) The lines printed by the alkali-activated modified sintered brick powder low-carbon mortar are full and uniform, the setting time is proper, the alkali-activated modified sintered brick powder low-carbon mortar has good printability, rheological property and interlayer bonding property, can better replace common silicate cement-based 3D printing materials, effectively reduces the consumption of silicate cement, reduces the cost of the 3D printing materials, and is simple in construction.
(4) According to the invention, the cellulose ether and the rubber powder are added, so that the adhesive property of the 3D printing material can be increased, the thixotropic property of the printing material is maintained, the gel powder is promoted to be uniformly distributed, and the guarantee is provided for the strength development of the gel material.
(5) The fiber is added in the invention, so that the tensile and crack resistance of the printing material can be effectively enhanced, and the later shrinkage of the 3D printing material can be reduced.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following description will be made in connection with the technical solutions in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides the following examples:
Example 1
The raw materials comprise the following components in parts by weight: 55 parts of mineral powder, 20 parts of modified sintered brick powder with the specific surface area of 900m 2/kg, 30 parts of class II fly ash, 130 parts of fine aggregate, 12 parts of alkali-activated agent, 0.1 part of cellulose ether, 0.15 part of 20mm polypropylene fiber, 0.20 part of rubber powder, 32 parts of tap water and 0.40 part of polycarboxylate water reducer.
The embodiment also provides the following preparation method:
(1) Uniformly stirring mineral powder, modified sintered brick powder, class II fly ash, fine aggregate, alkali-activated agent, cellulose ether, 20mm polypropylene fiber and rubber powder to form a mixture A;
And mixing the polycarboxylate water reducer with tap water, and uniformly stirring to obtain a mixed solution B.
(2) And pouring the mixture A into a stirrer to stir for 90s, adding the mixed solution B, and stirring for 180s to obtain the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing.
Example 2
The raw materials comprise 60 parts of mineral powder, 20 parts of modified sintered brick powder with the specific surface area of 1000m 2/kg, 25 parts of class II fly ash, 130 parts of fine aggregate, 10 parts of alkali-activated agent, 0.15 part of cellulose ether, 0.12 part of 15mm polypropylene fiber, 0.16 part of rubber powder, 30 parts of tap water and 0.50 part of polycarboxylate water reducer.
The embodiment also provides the following preparation method:
(1) Uniformly stirring mineral powder, modified sintered brick powder, class II fly ash, fine aggregate, alkali-activated agent, cellulose ether, 15mm polypropylene fiber and rubber powder to form a mixture A;
And mixing the polycarboxylate water reducer with tap water, and uniformly stirring to obtain a mixed solution B.
(2) And pouring the mixture A into a stirrer to stir for 100s, adding the mixed solution B, and stirring for 200s to obtain the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing.
Example 3
The raw materials comprise, by weight, 50 parts of mineral powder, 30 parts of modified sintered brick powder with a specific surface area of 1100m 2/kg, 15 parts of class II fly ash, 130 parts of fine aggregate, 8 parts of alkali-activator, 0.20 part of cellulose ether, 0.10 part of 10mm polypropylene fiber, 0.13 part of rubber powder, 35 parts of tap water and 0.45 part of polycarboxylate water reducer.
The embodiment also provides the following preparation method:
(1) Uniformly stirring mineral powder, modified sintered brick powder, class II fly ash, fine aggregate, alkali-activated agent, cellulose ether, 10mm polypropylene fiber and rubber powder to form a mixture A;
And mixing the polycarboxylate water reducer with tap water, and uniformly stirring to obtain a mixed solution B.
(2) And pouring the mixture A into a stirrer to stir for 120s, adding the mixed solution B, and stirring for 240s to obtain the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing.
The raw material component parameters or the preparation method of the above embodiment are specifically as follows:
The activity level of the mineral powder is not lower than S95 level, and the alkalinity coefficient is >1, and the quality coefficient is >1.2.
The preparation method of the modified sintered brick powder comprises the steps of firstly cleaning and crushing abandoned bricks after construction removal until the grain diameter is less than 30mm, drying, and then mixing the dried abandoned bricks, grinding aid and activating agent according to the mass ratio of 100:0.8:6, uniformly mixing, obtaining different specific surface areas by setting proper ball milling speed (100-270 r/min), ball milling time (30-60 min) and ball material ratio (15:1-8:1), and performing mechanical force activation by adopting a planetary ball mill to obtain modified sintered brick powder, wherein 28d volcanic ash activity can reach 80%, wherein the grinding aid is Maveklin grinding aid, glycol and lignin sulfonate according to the mass ratio of 1.2:1; the activator is triethanolamine, magnesium oxide, calcium oxide and alkaline mineral salt according to the mass ratio of 1:0.8:1.2: 0.5.
Wherein, the waste bricks of the example 1 come from the construction waste crushed bricks removed from a old district in the Xiamen city, the waste bricks of the example 2 come from the waste crushed bricks of a brickyard in the Zhangzhou city, and the waste bricks of the example 3 come from the waste bricks laid on a construction site in the Xiamen city.
The fine aggregate is medium sand with the bulk density of 1480kg/m 3 and the crushing value of 17.3 percent.
The alkali activator is industrial anhydrous sodium silicate with a molar weight of 1.0.
Different cellulose ethers were used in 3 examples, wherein the cellulose ether of example 1 was hydroxypropyl methyl cellulose ether, the cellulose ether of example 2 was hydroxyethyl methyl cellulose ether, and the cellulose ether of example 3 was hydroxyethyl cellulose ether.
The rubber powder has molecular weight of 1-10 ten thousand, 18 amino acids, water content and inorganic salt content below 16% and protein content above 82%.
The polycarboxylate water reducer is S13 type water reducer of Jie New Material group Co., ltd.
The invention also provides the following comparative examples:
Comparative example 1
This comparative example differs from example 1 only in that the cement of example 1 (which consists of mineral powder, modified sintered brick powder with a specific surface area of 900m 2/kg, class ii fly ash and alkali-activator) was replaced by ordinary portland cement (p·o42.5) and incorporated with suitable rapid hardening sulphoaluminate cement with equal mass, the remainder being identical to example 1, wherein the mass ratio of ordinary portland cement (p·o42.5) to rapid hardening sulphoaluminate cement is 3:1.
Comparative example 2
This comparative example differs from example 2 only in that ordinary portland cement (p·o42.5) was used and incorporated with appropriate rapid hardening type sulfoaluminate cement to replace the cement of example 2 (its cement consisting of ore powder, modified sintered brick powder of specific surface area 1000m 2/kg, class ii fly ash and alkali activator) by equal mass, otherwise in accordance with example 2, wherein the mass ratio of ordinary portland cement (p·o42.5) to rapid hardening type sulfoaluminate cement is 3:1.
Comparative example 3
This comparative example differs from example 3 only in that ordinary portland cement (p·o42.5) was used and incorporated with appropriate rapid hardening type sulfoaluminate cement to replace the cement of example 3 (its cement consisting of ore powder, modified sintered brick powder with specific surface area of 1100m 2/kg, class ii fly ash and alkali activator) by equal mass, otherwise in accordance with example 3, wherein the mass ratio of ordinary portland cement (p·o42.5) to rapid hardening type sulfoaluminate cement is 3:1.
Comparative example 4
The comparative example is different from example 2 only in that the selected waste brick powder is only screened, cleaned, dried, then crushed manually, not subjected to mechanical ball milling modification, not added with other activators, and directly screened with a square-hole screen to obtain fine waste brick powder smaller than 75 μm, and then the unmodified sintered brick powder is replaced by the modified sintered brick powder with the specific surface area of 1000m 2/kg in example 2 in equal mass, otherwise identical to example 2.
Comparative example 5
This comparative example differs from example 2 only in that sodium silicate in example 2 was replaced with a mass such as calcium hydroxide, the others being identical to example 2.
The 3D printing mortar prepared by the execution is prepared according to the standard: GB/T1346-2011 "method for testing water consumption, setting time and stability of Cement Standard consistency", GB/T17671-2021 "method for testing Cement mortar Strength (ISO method)" and the results are shown in the following Table:
TABLE 1
| Performance test project | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Fluidity/mm | 184 | 204 | 244 | 210 | 195 | 220 | 215 | 235 |
| Coagulation time/min | 83 | 100 | 122 | 150 | 146 | 162 | 125 | 210 |
| 7D compressive Strength/MPa | 45.5 | 48.7 | 42.4 | 39.3 | 43.2 | 39.7 | 33.9 | 16.8 |
| 28D compressive Strength/MPa | 54.7 | 60.3 | 51.33 | 49.8 | 52.8 | 47.3 | 48.6 | 23.5 |
From the test results in table 1, it can be seen that the mortar prepared in the embodiment has proper fluidity, can be smoothly extruded by a 3D printing instrument, is uniformly printed layer by layer, has better setting time and high early strength, can effectively improve the 3D printing construction speed, and is beneficial to guaranteeing the later hoisting construction.
Compared with comparative examples 1 to 3, under the same conditions, the alkali-activated waste brick powder 3D printing mortar prepared in the examples has high early strength, fast setting time and proper printing time window, and can accelerate printing speed and improve printing building efficiency. Therefore, the cementing material (the cementing material is composed of mineral powder, modified sintered brick powder, II-level fly ash and alkali-activated agent) can better replace the ordinary portland cement-based 3D printing material, so that the use amount of portland cement is effectively reduced, the cost of the 3D printing material is reduced, and the construction is simple.
As can be seen from comparative example 4, the modification treatment of the waste brick powder can effectively improve the pozzolanic activity of the brick powder and improve the utilization efficiency of the modified sintered brick powder.
As can be seen from comparative example 5, the invention adopts sodium silicate as the alkaline activator, which can significantly improve the comprehensive performance of the finished mortar.
In conclusion, the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing has good printability, rheological property and interlayer bonding property, can effectively utilize a large amount of industrial solid waste and waste bricks, provides a new application path for recycling the industrial solid waste and waste bricks, and has remarkable environmental protection value.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The utility model provides a be applicable to 3D and print with alkali excitation modified sintered brick powder low-carbon mortar which characterized in that: the raw materials comprise mineral powder, modified sintered brick powder, fly ash, fine aggregate, alkali-activated agent, cellulose ether, fiber, rubber powder, water and polycarboxylate water reducer;
the preparation method of the modified sintered brick powder comprises the steps of firstly cleaning, crushing and drying the waste bricks, then uniformly mixing the dried waste bricks, grinding aids and activating agents, and then grinding to obtain the modified sintered brick powder;
The grinding aid is Maveklin grinding aid, glycol and lignin sulfonate with the mass ratio of 1.2-0.8:1-0.5:1-0.6; the activator is triethanolamine, magnesium oxide, calcium oxide and alkaline mineral salt according to the mass ratio of 1-0.6: 0.8 to 0.5:1.2 to 0.7:0.5 to 0.3;
the dried waste brick, grinding aid and activator
The mass ratio is 100-90: 1.0 to 0.6:8 to 5.
2. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein: the modified sintered brick powder comprises, by weight, 40-60 parts of mineral powder, 20-30 parts of modified sintered brick powder, 15-30 parts of fly ash, 110-130 parts of fine aggregate, 8-12 parts of alkali-activated agent, 0.1-0.2 part of cellulose ether, 0.06-0.15 part of fiber, 0.13-0.2 part of rubber powder, 30-40 parts of water and 0.35-0.5 part of polycarboxylate water reducer.
3. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein: the molecular weight of the rubber powder is 1-10 ten thousand, the rubber powder contains 18 amino acids, the moisture and inorganic salt content is below 16%, and the protein content is above 82%.
4. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein: the fiber is polypropylene fiber or glass fiber, and the length range of the fiber is 5-20 mm.
5. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein: the fly ash is class II fly ash.
6. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein: the alkali-activated agent is industrial anhydrous sodium silicate with a molar weight of 1.0.
7. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein: the cellulose ether is at least one of hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose ether.
8. A method for preparing the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to any one of claims 1-7, comprising the following preparation steps:
(1) Uniformly stirring mineral powder, modified sintered brick powder, fly ash, fine aggregate, alkali-activated agent, cellulose ether, fiber and rubber powder to form a mixture A;
mixing a polycarboxylate water reducer with water, and uniformly stirring to obtain a mixed solution B;
(2) And pouring the mixture A into a stirrer to stir for 90-120 s, adding the mixed solution B, and stirring for 180-240 s to obtain the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing.
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