CN115819025A - 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
- Publication number
- CN115819025A CN115819025A CN202211640226.9A CN202211640226A CN115819025A CN 115819025 A CN115819025 A CN 115819025A CN 202211640226 A CN202211640226 A CN 202211640226A CN 115819025 A CN115819025 A CN 115819025A
- Authority
- CN
- China
- Prior art keywords
- alkali
- sintered brick
- brick powder
- modified sintered
- printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims abstract description 116
- 239000011449 brick Substances 0.000 title claims abstract description 111
- 239000003513 alkali Substances 0.000 title claims abstract description 56
- 238000010146 3D printing Methods 0.000 title claims abstract description 41
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 41
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000002699 waste material Substances 0.000 claims abstract description 37
- 239000012190 activator Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000010881 fly ash Substances 0.000 claims abstract description 22
- 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 17
- 238000000227 grinding Methods 0.000 claims abstract description 17
- 229920001971 elastomer Polymers 0.000 claims abstract description 16
- 239000005060 rubber Substances 0.000 claims abstract description 16
- 239000002253 acid Substances 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
- 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 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 11
- 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
- 229920001732 Lignosulfonate Polymers 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 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
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 4
- 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
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical group OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 230000003213 activating effect Effects 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
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 21
- 239000011398 Portland cement Substances 0.000 abstract description 13
- 239000004567 concrete Substances 0.000 abstract description 4
- 239000011229 interlayer Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 19
- 238000010276 construction Methods 0.000 description 16
- 239000004568 cement Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 10
- 238000007639 printing Methods 0.000 description 8
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 238000000498 ball milling Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000001828 Gelatine Substances 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 238000009435 building construction Methods 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
- 238000007385 chemical modification Methods 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
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 238000004137 mechanical activation 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
- 238000004064 recycling Methods 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
- 238000009827 uniform distribution Methods 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
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete admixtures, 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, an alkali activator, cellulose ether, fiber, rubber powder, water and a polycarboxylic acid water reducer; the preparation method of the modified sintered brick powder comprises the steps of cleaning, crushing and drying the waste bricks, uniformly mixing the dried waste bricks, the grinding aid and the activator, and grinding to obtain the modified sintered brick powder. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing has good printable performance, rheological performance and interlayer bonding performance, can better replace common portland cement-based 3D printing materials, effectively reduces the using amount of portland cement, reduces the cost of the 3D printing materials, and is simple to construct.
Description
Technical Field
The invention relates to the field of building materials, and particularly relates to alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and a preparation method thereof.
Background
The 3D printing technology is used as a part of digital manufacturing, has a plurality of advantages in the fields of construction and building, has huge development potential, and becomes a hot development direction of the construction industry at the present stage. However, the type of printing materials available at present is very limited, which seriously hinders the development of the field of 3D printed buildings. Therefore, it becomes a very important matter to develop materials that meet the requirements in the field of 3D printed buildings. The good printing material is a basic premise of 3D printing building construction, and the 3D printing concrete material is required to have 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 municipal waste at present. Conservative estimation shows that in the next 10 years, more than 15 hundred million tons of construction wastes are generated in China per year on average, the storage amount of the construction wastes in China in 2020 reaches 237 hundred million tons, and the construction waste bricks account for 30-50% of the construction solid wastes. At present, the construction waste bricks are generally prepared into recycled coarse and fine aggregates, and are applied to the engineering again, and the relative process is mature. However, the application of the sintered brick powder directly or indirectly obtained by preparing recycled aggregate from building waste bricks through crushing is relatively limited, and the sintered brick powder has the defects of poor grain shape, large water demand, low gelling 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 brings negative effects to economy, ecology and society. The problem of recycling the building waste bricks is urgently needed to be solved.
Disclosure of Invention
In order to solve the problems that common portland cement is difficult to prepare and is suitable for 3D printing construction and waste bricks are stacked in the background art, the invention provides alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing, wherein the raw materials comprise mineral powder, modified sintered brick powder, fly ash, fine aggregate, an alkali activator, cellulose ether, fiber, rubber powder, water and a polycarboxylic acid water reducer;
the preparation method of the modified sintered brick powder comprises the steps of cleaning, crushing and drying the waste bricks, uniformly mixing the dried waste bricks, the grinding aid and the activator, and grinding to obtain the modified sintered brick powder.
The modified sintered brick powder is prepared by modifying waste bricks removed and abandoned from buildings, specifically, the waste bricks are cleaned and crushed to a particle size of less than 30mm, dried, and then the dried waste bricks, a grinding aid and an activator are mixed according to a mass ratio of 100-90: 1.0-0.8: 8-5, and the modified sintered brick powder is obtained by setting a proper ball milling speed (100-270 r/min), ball milling time (30-60 min) and ball-to-material ratio (15-8:1) and performing mechanical activation by using a planetary ball mill, wherein the activity of the 28d volcanic ash of the obtained modified sintered brick powder can reach over 80 percent, and the activity of the modified sintered brick powder meets and exceeds 70 percent of that of GBT 1596-2017 fly ash used in cement and concrete.
In addition, the 28d pozzolanic activity of the modified sintered brick powder obtained by the modification method can reach more than 80 percent by mainly utilizing the modification method, so that the use condition of the modified sintered brick powder can be met, and the waste bricks from different sources have certain difference by the production process or the composition, but the influence of the factors on the performance of the finished mortar finally prepared by the invention is small.
On the basis of the scheme, the grinding aid is a Maveklin grinding aid, glycol and lignin sulfonate, and the mass ratio of the grinding aid to the glycol to the lignin sulfonate is 1.2-0.8; the activating agent is triethanolamine, magnesium oxide, calcium oxide and alkaline mineral salt according to the mass ratio of 1-0.6: 0.8-0.5: 1.2-0.7: 0.5 to 0.3.
On the basis of the scheme, the concrete admixture further 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 activator, 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 polycarboxylic acid water reducer.
On the basis of the scheme, the activity level of the ore powder is not lower than S95 level, and the alkalinity coefficient is greater than 1, and the mass coefficient is greater than 1.2.
On the basis of the scheme, the fly ash is grade II fly ash.
On the basis of the scheme, further, the alkali-activator is industrial grade anhydrous sodium silicate with the molar weight of 1.0.
On the basis of the above scheme, further, the cellulose ether is at least one of hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose ether.
On the basis of the scheme, the fibers are polypropylene fibers or glass fibers, and the length range of the fibers is 5-20 mm.
On the basis of the scheme, the molecular weight of the rubber powder is 1-10 ten thousand, 18 amino acids are contained, the moisture content and the inorganic salt content are below 16%, and the protein content is above 82%.
On the basis of the scheme, the polycarboxylic acid water reducing agent is further compounded by polycarboxylic acid 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 polycarboxylate water reducer adopted in the invention mainly considers its water reducing performance, so that the use conditions of the invention can be satisfied only by the water reducer with the water reducing rate of 30-34%, and the specific preparation and composition of different water reducers can be adjusted or selected by those skilled in the art, and are not described herein again.
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, an alkali activator, cellulose ether, fiber and rubber powder to form a mixture A;
mixing a polycarboxylic acid water reducing agent and water, and uniformly stirring to obtain a mixed solution B;
(2) And pouring the mixture A into a stirrer to be stirred 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 provided by the invention has the following technical principles and beneficial effects:
(1) The alkaline activator can provide OH with higher concentration for slurry - The inactive bond of the surface of the modified sintered brick powder is easily converted into a free unsaturated active bond in an alkaline environment, namely the surface S iO 2 And Al 2 O 3 The Si-O and A l-O bonds in the gel are broken to form Si-O-A l network polymer, the polymerization degree is reduced, and the gel is easy to have volcanic ash reaction with active ingredients in a system to generate C-S (A) -H gel with higher strength and hydraulic property. The proper alkali activator is mixed 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 mechanical force chemical modification treatment is carried out on the waste building bricks, 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 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 appropriate, the alkali-activated modified sintered brick powder low-carbon mortar has good printing performance, rheological performance and interlayer bonding performance, common portland cement-based 3D printing materials can be well replaced, the using amount of portland cement is effectively reduced, the cost of the 3D printing materials is reduced, and the construction is simple.
(4) According to the invention, the cellulose ether and the rubber powder are added, so that the bonding property of the 3D printing material can be improved, the thixotropic property of the printing material is maintained, the uniform distribution of the gelled powder is promoted, and the development of the strength of the gelled material is guaranteed.
(5) The fiber is added in the invention, so that the tensile crack resistance of the printing material can be effectively enhanced, and the later-stage shrinkage of the 3D printing material is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the embodiments of the present invention, and obviously, the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides the following examples:
example 1
The raw materials comprise the following components in parts by weight: 55 parts of mineral powder and 900m of specific surface area 2 Per kg of modified sintered brick powder 20 parts, class II fly ash 30 parts, fine aggregate 130 parts, alkali activator 12 parts, cellulose ether 0.1 part, 20mm polypropylene fiber 0.15 part, rubber powder 0.20 part, tap water 32 parts and polycarboxylic acid water reducing agent 0.40 part.
This example also provides the following preparation:
(1) Uniformly stirring mineral powder, modified sintered brick powder, II-grade fly ash, fine aggregate, alkali activator, cellulose ether, 20mm polypropylene fiber and rubber powder to form a mixture A;
and mixing the polycarboxylic acid water reducing agent and tap water, and uniformly stirring to obtain a mixed solution B.
(2) And pouring the mixture A into a stirrer to be stirred 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 and 1000m of specific surface area by weight 2 Per kg of 20 parts of modified sintered brick powder, 25 parts of grade II fly ash, 130 parts of fine aggregate, 10 parts of alkali activator, 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 polycarboxylic acid water reducing agent.
This example also provides the following preparation:
(1) Uniformly stirring mineral powder, modified sintered brick powder, II-grade fly ash, fine aggregate, alkali activator, cellulose ether, 15mm polypropylene fiber and rubber powder to form a mixture A;
and mixing the polycarboxylic acid water reducing agent and tap water, and uniformly stirring to obtain a mixed solution B.
(2) And pouring the mixture A into a stirrer to be stirred 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 50 parts of mineral powder and 1100m of specific surface area by weight 2 30 parts of modified sintered brick powder per 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 polycarboxylic acid water reducing agent.
This example also provides the following preparation:
(1) Uniformly stirring mineral powder, modified sintered brick powder, II-grade fly ash, fine aggregate, alkali activator, cellulose ether, 10mm polypropylene fiber and rubber powder to form a mixture A;
and mixing the polycarboxylic acid water reducing agent and tap water, and uniformly stirring to obtain a mixed solution B.
(2) And pouring the mixture A into a stirrer to be stirred for 120s, adding the mixed solution B to be stirred for 240s, and obtaining 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 embodiment are as follows:
the activity level of the mineral powder is not lower than S95 level, and the alkalinity coefficient is more than 1, and the mass coefficient is more than 1.2.
The preparation method of the modified sintered brick powder comprises the steps of cleaning waste bricks removed and abandoned from buildings, crushing the waste bricks until the particle size is smaller than 30mm, drying the waste bricks, grinding aids and activators in a mass ratio of 100:0.8:6, uniformly mixing, obtaining different specific surface areas by setting a proper ball milling speed (100-270 r/min), a proper ball milling time (30-60 min) and a ball-to-material ratio (15-8:1), and performing mechanical force activation by using a planetary ball mill to obtain the modified sintered brick powder, wherein the activity of the 28d volcanic ash can reach 80%, wherein the grinding aid is a Maveklin grinding aid, ethylene glycol and a lignin sulfonate and consists of 1.2; the activating agent is triethanolamine, magnesium oxide, calcium oxide and alkaline mineral salt in a mass ratio of 1:0.8:1.2:0.5, and mixing.
Among them, the waste bricks of example 1 are derived from broken bricks of construction waste removed from a certain old district of mansion city, the waste bricks of example 2 are derived from broken bricks of a certain brick factory of zhangzhou city, and the waste bricks of example 3 are derived from waste bricks built at a certain construction site of mansion city.
The fine aggregate has a bulk density of 1480kg/m 3 Medium sand with a crush value of 17.3%.
The alkali activator is industrial grade anhydrous sodium silicate with a molar weight of 1.0.
In 3 examples different cellulose ethers were used, wherein the cellulose ether of example 1 was a hydroxypropyl methyl cellulose ether, the cellulose ether of example 2 was a hydroxyethyl methyl cellulose ether and the cellulose ether of example 3 was a hydroxyethyl cellulose ether.
The gelatine powder has a molecular weight of 1-10 ten thousand, contains 18 amino acids, has a water content and an inorganic salt content of below 16 percent, and has a protein content of above 82 percent.
The polycarboxylate superplasticizer is S13 type superplasticizer of Kejie New materials group Co.
The invention also provides the following comparative examples:
comparative example 1
This comparative example differs from example 1 only in that ordinary portland cement (P · O42.5) is used and a suitable quick-hardening sulphoaluminate cement is incorporated to replace the cement of example 1 (the cement is made of powdered ore, with a specific surface area of 900 m) by an equal mass 2 Kg of modified sintered brick powder, class II fly ash and alkali activator), the rest being the same as in example 1, whereinThe mass ratio of the Portland cement (P.O 42.5) to the quick-hardening sulphoaluminate cement is 3:1.
comparative example 2
This comparative example differs from example 2 only in that ordinary Portland cement (P.O 42.5) is used and a suitable quick-setting sulphoaluminate cement is incorporated to replace the cement of example 2 (the cement of which consists of mineral fines, having a specific surface area of 1000 m) by an equal mass 2 /kg of modified sintered brick powder, class II fly ash and an alkali activator), and the balance being the same as that in example 2, wherein the mass ratio of ordinary portland cement (P.O 42.5) to quick-hardening sulphoaluminate cement is 3:1.
comparative example 3
This comparative example differs from example 3 only in that ordinary Portland cement (P.O 42.5) is used and a suitable quick-setting sulphoaluminate cement is incorporated to replace the cement of example 3 (the cement of which consists of mineral fines, with a specific surface area of 1100 m) 2 Kg of modified sintered brick powder, class II fly ash and alkali activator), and the balance being the same as in example 3, wherein the mass ratio of the ordinary portland cement (P. O42.5) to the quick-hardening sulphoaluminate cement is 3:1.
comparative example 4
The difference between the comparative example and the example 2 is that the selected waste brick powder is only screened, cleaned, dried and then manually crushed without mechanical ball milling modification or other activators, and is directly screened by a square-hole screen to obtain fine waste brick powder with the particle size of less than 75 mu m, and the unmodified sintered brick powder and the like are replaced by the brick powder with the mass of 1000m of specific surface area in the example 2 2 Perkg of modified sintered brick powder, otherwise identical to example 2.
Comparative example 5
This comparative example differs from example 2 only in that a mass of calcium hydroxide or the like is used in place of the sodium silicate in example 2, and the others are in accordance with example 2.
The 3D printing mortar prepared by the above implementation was standardized: GB/T1346-2011 test method for water consumption, setting time and stability of standard consistency of cement, GB/T17671-2021 test method for strength of cement mortar (ISO method), tests the performance of the test results, 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, the mortar prepared by the embodiment has proper fluidity, can be smoothly extruded by a 3D printing instrument, can be uniformly printed layer by layer, has better setting time and high early strength, can effectively improve the 3D printing construction speed, and is favorable for guaranteeing later-stage 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 and quick setting time, and the printing speed can be increased and the printing building efficiency can be improved by a proper printing time window. Therefore, the cementing material (the cementing material consists of mineral powder, modified sintered brick powder, II-grade fly ash and an alkali activator) can better replace a common Portland cement-based 3D printing material, the consumption 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 volcanic ash 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 alkali-activator, and can obviously improve the comprehensive performance of the finished mortar.
In conclusion, the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing provided by the invention has good printability, rheological property and interlayer bonding property, can effectively utilize industrial solid waste and waste bricks in large quantities, provides a new application approach for resource utilization of the industrial solid waste and waste bricks, and has obvious environmental protection value.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a be applicable to 3D printing alkali arouses 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 activator, cellulose ether, fiber, rubber powder, water and polycarboxylic acid water reducer;
the preparation method of the modified sintered brick powder comprises the steps of cleaning, crushing and drying the waste bricks, uniformly mixing the dried waste bricks, the grinding aid and the activator, and grinding to obtain the modified sintered brick powder.
2. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the dried waste bricks, the grinding aid and the activator are mixed according to the mass ratio of 100-90: 1.0-0.6: 8 to 5.
3. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the grinding aid is a Maveklin grinding aid, glycol and lignin sulfonate, and the mass ratio of the grinding aid to the glycol to the lignin sulfonate is 1.2-0.8; the activating agent is triethanolamine, magnesium oxide, calcium oxide and alkaline mineral salt in a mass ratio of 1-0.6: 0.8-0.5: 1.2-0.7: 0.5 to 0.3.
4. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the brick 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 activator, 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 polycarboxylic acid water reducer.
5. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the molecular weight of the rubber powder is 1-10 ten thousand, 18 amino acids are contained, the moisture content and the inorganic salt content are below 16%, and the protein content is above 82%.
6. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing as claimed in claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the fiber is polypropylene fiber or glass fiber, and the length range of the fiber is 5-20 mm.
7. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the fly ash is class II fly ash.
8. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing as claimed in claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the alkali activator is industrial grade anhydrous sodium silicate with the molar weight of 1.0.
9. The alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to claim 1, wherein the alkali-activated modified sintered brick powder low-carbon mortar is characterized in that: the cellulose ether is at least one of hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose ether.
10. The preparation method of the alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing according to any one of claims 1 to 9, is characterized by comprising the following preparation steps:
(1) Uniformly stirring mineral powder, modified sintered brick powder, fly ash, fine aggregate, an alkali activator, cellulose ether, fiber and rubber powder to form a mixture A;
mixing a polycarboxylic acid water reducing agent and water, and uniformly stirring to obtain a mixed solution B;
(2) And pouring the mixture A into a stirrer to be stirred 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211640226.9A CN115819025B (en) | 2022-12-19 | 2022-12-19 | Alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211640226.9A CN115819025B (en) | 2022-12-19 | 2022-12-19 | Alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115819025A true CN115819025A (en) | 2023-03-21 |
| CN115819025B CN115819025B (en) | 2024-05-31 |
Family
ID=85516989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211640226.9A Active CN115819025B (en) | 2022-12-19 | 2022-12-19 | Alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115819025B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117846211A (en) * | 2023-12-28 | 2024-04-09 | 广东工业大学 | 3D printing low-carbon optimized deformed concrete slab and preparation process thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5705141A (en) * | 1990-11-21 | 1998-01-06 | Lhoist Researche Et Developpement S.A. | Calcium and/or magnesium hydroxide, and preparation and use thereof |
| KR20060004586A (en) * | 2004-07-08 | 2006-01-12 | 박상영 | Alkalic mineral salt of rich minerals and production method thereof |
| CN101397199A (en) * | 2008-06-20 | 2009-04-01 | 淄博宜龙化工有限公司 | Cement grinding aid strengthening agent |
| CN106348643A (en) * | 2016-08-19 | 2017-01-25 | 桂林华越环保科技有限公司 | Modified concrete expansive agent |
| CN106431028A (en) * | 2015-08-13 | 2017-02-22 | 吉林省圣翔建材集团有限公司 | Construction waste red brick powder and coal ash geopolymer material and preparation method thereof |
| CN107298546A (en) * | 2017-06-16 | 2017-10-27 | 南京理工大学 | Alkali-activated carbonatite binder materials and its Method of printing for 3D printing |
| CN107601959A (en) * | 2017-10-23 | 2018-01-19 | 东阿东昌天汇科技有限公司 | Slag micropowder grinding aid and preparation method thereof |
| KR20210023940A (en) * | 2021-02-23 | 2021-03-04 | 정하익 | Injection, spray, repair, reinforcement, work, grouting equipment and method |
| CN113149547A (en) * | 2021-03-25 | 2021-07-23 | 沈阳理工大学 | Alkali-activated regenerated clay brick powder cementing material and preparation method and application thereof |
-
2022
- 2022-12-19 CN CN202211640226.9A patent/CN115819025B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5705141A (en) * | 1990-11-21 | 1998-01-06 | Lhoist Researche Et Developpement S.A. | Calcium and/or magnesium hydroxide, and preparation and use thereof |
| KR20060004586A (en) * | 2004-07-08 | 2006-01-12 | 박상영 | Alkalic mineral salt of rich minerals and production method thereof |
| CN101397199A (en) * | 2008-06-20 | 2009-04-01 | 淄博宜龙化工有限公司 | Cement grinding aid strengthening agent |
| CN106431028A (en) * | 2015-08-13 | 2017-02-22 | 吉林省圣翔建材集团有限公司 | Construction waste red brick powder and coal ash geopolymer material and preparation method thereof |
| CN106348643A (en) * | 2016-08-19 | 2017-01-25 | 桂林华越环保科技有限公司 | Modified concrete expansive agent |
| CN107298546A (en) * | 2017-06-16 | 2017-10-27 | 南京理工大学 | Alkali-activated carbonatite binder materials and its Method of printing for 3D printing |
| CN107601959A (en) * | 2017-10-23 | 2018-01-19 | 东阿东昌天汇科技有限公司 | Slag micropowder grinding aid and preparation method thereof |
| KR20210023940A (en) * | 2021-02-23 | 2021-03-04 | 정하익 | Injection, spray, repair, reinforcement, work, grouting equipment and method |
| CN113149547A (en) * | 2021-03-25 | 2021-07-23 | 沈阳理工大学 | Alkali-activated regenerated clay brick powder cementing material and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| OU, YANG KE LIAN ET AL: "Evaluation of the grinding effect of alkanolamines and its influence on alite hydration", 《 SOUTH CHINA UNIVERSITY OF TECHNOLOGY (PEOPLE\'S REPUBLIC OF CHINA)》, 20 May 2023 (2023-05-20), pages 1 - 5 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117846211A (en) * | 2023-12-28 | 2024-04-09 | 广东工业大学 | 3D printing low-carbon optimized deformed concrete slab and preparation process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115819025B (en) | 2024-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108569859B (en) | Waterproof and impervious concrete additive with self-repairing function and preparation method thereof | |
| CN114292073B (en) | Aeolian sand anti-freezing concrete capable of being printed in 3D mode and preparation method and using method thereof | |
| CN113264700A (en) | Regenerated cementing material based on subway shield sludge | |
| CN114213095A (en) | Alkali-activated phosphogypsum self-leveling mortar | |
| CN113004005A (en) | Cement-based grouting material prepared based on machine-made sand | |
| CN109111179A (en) | It is a kind of for building the green cement sill of 3D printing | |
| CN115819025B (en) | Alkali-activated modified sintered brick powder low-carbon mortar suitable for 3D printing and preparation method thereof | |
| CN108483978B (en) | Cementing agent for regenerated pervious concrete and preparation method and application thereof | |
| CN114230270A (en) | Shield synchronous grouting material and preparation method thereof | |
| CN113788666A (en) | Super early strength recycled concrete and preparation method thereof | |
| CN115124298B (en) | High-strength recycled aggregate concrete prepared from waste stone powder and preparation method thereof | |
| CN115594450B (en) | Geopolymer ceramsite lightweight concrete and preparation method thereof | |
| CN117209222A (en) | Preparation method of building 3D printing material | |
| CN115745519A (en) | Foamed light soil based on expansive soil and industrial solid waste and preparation method thereof | |
| CN114988798A (en) | Masonry mortar prepared from recycled brick aggregate and preparation method thereof | |
| CN111302751A (en) | Wall material composite material | |
| CN110028295A (en) | A kind of mating grouting material of ECP wallboard and preparation method thereof | |
| CN117024065B (en) | High-performance recycled concrete based on hydrate directional deposition reinforced interface transition zone and preparation method thereof | |
| CN113603444B (en) | Solid waste base dry-mixed mortar and preparation method thereof | |
| CN112094081B (en) | Mortar and preparation method thereof | |
| CN114907079B (en) | High-adhesion waterproof ceramic tile joint filling mortar and preparation method thereof | |
| CN115108798B (en) | Large-flow-state self-compaction citric acid gypsum mortar and preparation method thereof | |
| CN115180915B (en) | High-performance concrete and preparation method thereof | |
| CN117285304B (en) | Plastering mortar and preparation method thereof | |
| CN115057638B (en) | Hydrated calcium silicate and hydrated magnesium silicate cementing material for mine filling and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |