CN118084532A - Preparation method of low-carbon shrinkage-inhibiting high-alkali-excitation sand-washing tail mud foam concrete - Google Patents
Preparation method of low-carbon shrinkage-inhibiting high-alkali-excitation sand-washing tail mud foam concrete Download PDFInfo
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- CN118084532A CN118084532A CN202410256457.2A CN202410256457A CN118084532A CN 118084532 A CN118084532 A CN 118084532A CN 202410256457 A CN202410256457 A CN 202410256457A CN 118084532 A CN118084532 A CN 118084532A
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- 238000005406 washing Methods 0.000 title claims abstract description 75
- 239000011381 foam concrete Substances 0.000 title claims abstract description 73
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000003513 alkali Substances 0.000 claims abstract description 41
- 238000003756 stirring Methods 0.000 claims abstract description 31
- 239000004088 foaming agent Substances 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 238000005187 foaming Methods 0.000 claims abstract description 16
- 239000006260 foam Substances 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 239000003365 glass fiber Substances 0.000 claims abstract description 6
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims description 47
- 239000004568 cement Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000011268 mixed slurry Substances 0.000 claims description 9
- 239000011812 mixed powder Substances 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000006071 cream Substances 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 239000011550 stock solution Substances 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 239000004567 concrete Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000013518 molded foam Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/42—Glass
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/248—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork from specific plants, e.g. hemp fibres
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
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- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The preparation method of the low-carbon shrinkage-inhibiting high-alkali-activated sand-washing tail mud foam concrete comprises the steps of firstly mixing and stirring slag, an additive and treated sand-washing tail mud, then adding glass fibers and pretreated waste coffee grounds, mixing, continuously adding water glass solution, stirring, and finally adding foam prepared by a pretreated foaming agent, and uniformly stirring to obtain the alkali-activated sand-washing tail mud foam concrete. According to the invention, on one hand, the stability of the foam is optimized by means of microwave treatment of the foaming agent, control of the concentration of the foaming liquid, admixture doping and the like, and on the other hand, the strength of the foam concrete is improved by doping the composite fiber, so that the low-carbon shrinkage-inhibiting high-strength alkali-activated sand-washing tail mud foam concrete is prepared, and the foam concrete is green and has excellent performance, so that the foam concrete has a wide popularization prospect.
Description
Technical Field
The invention belongs to the technical field of solid waste utilization and foam concrete preparation, and particularly discloses a preparation method of low-carbon shrinkage-inhibiting high-alkali excitation sand-washing tail mud foam concrete.
Background
Along with the limitation of China on the exploitation of natural sand aggregate resources, the production quantity of machine-made sand is in a rising trend in China. The process of producing machine-made sand in the quarry mainly comprises three steps of crushing, washing and sorting, and a great amount of sand washing tail mud is often generated in the washing and sorting process. At present, the main treatment mode of sand washing tail mud is mainly piling, and a series of problems are often caused by the treatment mode. For example, the sand washing tail mud is piled up to occupy a great deal of land resources, so that land desertification and resource waste are caused; in addition, the sand washing tail mud contains more fine particles, so that on one hand, the sand washing tail mud is washed out in rainy days and flows into rivers along with rainwater to pollute the environment, on the other hand, dust can be caused when the sand washing tail mud is dried, and respiratory diseases and the like are easily caused when human bodies inhale the sand washing tail mud. Therefore, more reasonable ways are needed to absorb more and more sand washing tail mud.
The foam concrete is a light heat-insulating material containing a large number of closed air holes, can be used as heat-insulating materials for walls, roofs, floors, pipelines and other parts, and can be used as filling materials for projects such as ecological islands, artificial wetlands, sponge cities and the like, so that the greening area is increased, the water quality and the air quality are improved, and the sustainability of ecological environment is improved. From the analysis, the application range of the foam concrete is very wide, and if the sand washing tail mud can be applied to the foam concrete, a large amount of the sand washing tail mud can be quickly absorbed.
Disclosure of Invention
The main purpose of the invention is to apply the sand washing tail mud waste material to foam concrete, reduce the possible damage caused by a large amount of accumulated sand washing tail mud and realize the high added value utilization of the sand washing tail mud.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the preparation method of the low-carbon shrinkage-inhibiting high-alkali excitation sand washing tail mud foam concrete is characterized by comprising the following steps of:
1) The sand washing tail mud mainly comprises stone powder and mud, wherein the stone powder content is less than or equal to 50%, the mud content is more than or equal to 50%, the sand washing tail mud is dried at 100 ℃ for 12 h and ball-milled for 20-60 min, and particles with the particle diameter of more than or equal to 3mm in the ball-milled sand washing tail mud are removed for standby;
2) Dissolving an exciting agent in clear water, standing until the mixed solution of the exciting agent is cooled to normal temperature for standby;
3) And diluting the pretreated cement foaming agent with clear water to obtain foaming liquid, wherein the dilution factor is 30-60 times (the foaming liquid is uniformly mixed with clear water with the mass of 30-60 times).
4) Metering the materials of each group according to the mass ratio for standby: adding sand washing tail mud, slag and an additive into a mortar stirring pot, and stirring for 1min at a rotating speed of 62+/-5 r/min to obtain mixed powder, wherein the slag is S95 slag, and the additive is one or more of sodium chloride, sodium hydroxide, sodium carbonate and calcium hydroxide; uniformly dispersing the fibers, putting the fibers into the mixed powder, and stirring for 2min at the rotating speed of 62+/-5 r/min to obtain a mixed dry material; pouring the mixed solution of the exciting agent into the mixed dry material, and stirring for 2min at the rotating speed of 62+/-5 r/min to prepare mixed slurry; preparing the prepared foaming liquid into uniform foam through a foaming machine, adding the foam into the mixed slurry, stirring for 1min at a rotating speed of 62+/-5 r/min, and then taking down a stirring pot tool to scrape materials remained on the pot wall and the pot bottom; placing the mixture back into a stirring pot to continuously stir at the rotating speed of 62+/-5 r/min for 1-2 min, ensuring that the foam is uniformly dispersed in the mixed slurry, and obtaining the alkali-activated sand washing tail mud foam concrete slurry when the final mixture presents a creamy fluid consistency which is easy to pour;
5) And (3) injection molding the obtained cream alkali-activated sand-washing tail mud foam concrete slurry, placing the slurry in an environment with the temperature of 23+/-2 ℃ and the relative humidity of 65+/-15% for 1d, curing for 28d after the slurry is hardened and disassembled, and placing the slurry in an environment with the temperature of 20+/-2 ℃ and the relative humidity of more than 95% to prepare the low-carbon shrinkage-inhibiting high-alkali-activated sand-washing tail mud foam concrete.
Specifically, the exciting agent in the step 2) is solid water glass, the solid content is 100%, and the modulus is 1-1.5 mol.
Specifically, in the step 3), the model of the cement foaming agent is LG-2258, the production unit is Shandong Yousu chemical technology Co., ltd, and the pretreatment cement foaming agent is obtained by the following steps: and (3) placing the stock solution of the cement foaming agent into a microwave oven, setting the microwave power to be 500W, and heating for 30-40 seconds.
Specifically, the fiber in the step 4) is a fiber formed by mixing glass fiber and modified waste coffee grounds according to a ratio of 2:1. Further, the modified waste coffee grounds are obtained by: the waste coffee grounds are placed in 3mol/L sodium hydroxide solution for soaking for 1h, and then the soaked waste coffee grounds are placed in a 100 ℃ oven for drying to constant weight.
The alkali-activated sand washing tail mud foam concrete prepared by the invention has the following advantages:
1) The invention is the foam concrete prepared mainly based on the sand washing tail mud and the alkali-activated cementing material, and the sand washing tail mud is partially mixed into the foam concrete instead of slag, so that the environment pollution easily caused by the accumulation of the sand washing tail mud is solved to a certain extent, and the waste of the sand washing tail mud is changed into valuable. The alkali is used for exciting the cementing material instead of the traditional cement, so that the method is very in line with the 'double carbon policy' advocated at present, and has the characteristics of green and environmental protection.
2) The invention takes the treated sand washing tail mud as the raw material, the prepared foam concrete has small shrinkage and high strength, and the utilization rate of the sand washing tail mud is as high as 30 percent. The prepared alkali-activated foam concrete meets the corresponding requirements of the national standard JGT266-2011 foam concrete, and has better mechanical properties compared with the traditional cement foam concrete.
3) The fiber used in the invention, namely the compound glass fiber and the waste coffee grounds, can play roles in inhibiting shrinkage and improving mechanical properties in alkali-activated sand washing tail mud foam concrete. The waste coffee grounds are used as a porous material with larger specific surface area, so that the internal curing effect can be exerted in the foam concrete to inhibit shrinkage, and the porous structure can be used as a landing site to promote the growth of hydration products so as to improve the strength of the foam concrete. On the one hand, the glass fiber has certain water retention and evaporation delaying capacity, and further can play a role in inhibiting shrinkage, on the other hand, the glass fiber has very strong compressive strength, can form a disordered support system by being uniformly dispersed in the foam concrete, disperses the directional stress of the foam concrete, prevents the generation and development of primary cracks in the foam concrete, eliminates or reduces the number and the scale of the primary micro cracks, greatly improves the anti-cracking and anti-permeability capacity of the concrete, further inhibits the shrinkage of the foam concrete and optimizes the mechanical property of the foam concrete.
4) The mechanical property or durability of the foam concrete depends on the quality of the foam to a great extent, and the invention improves the foam density, the foam stability and the viscosity of the foam concrete by the measures of treating the foaming agent by microwaves, controlling the concentration of the foaming liquid and doping the additive, thereby playing a role in improving the performance of the foam concrete finally.
Detailed Description
Example 1: the traditional foam concrete has relatively low strength, and the alkali-activated cementing material has the advantage of relatively high strength, so that the embodiment applies the sand washing tail mud to the alkali-activated foam concrete, and the obvious degradation of the strength of the foam concrete caused by the application of the sand washing tail mud is avoided. However, alkali-activated foam concrete tends to have the problems of large shrinkage, easiness in cracking and the like, and the problems are mainly caused by the fact that alkali-activated reaction tends to be faster. The embodiment adopts the sand washing tail mud with lower activity to replace slag with higher activity to be applied to alkali-activated foam concrete, so that the alkali-activated reaction degree can be reduced to a certain extent, and the shrinkage cracking problem can be further improved.
The preparation method of the low-carbon shrinkage-inhibiting high-alkali excitation sand-washing tail mud foam concrete comprises the following steps:
1) The machine-made sand production line obtains sand washing tail mud which mainly comprises stone powder and mud, the stone powder content of the sand washing tail mud is tested to be 26% after the sand washing tail mud is crushed, the mud content is 71%, the crushed sand washing tail mud is dried at 100 ℃ for 12h and ball-milled for 30min, and particles with the particle diameter of more than or equal to 3mm in the ball-milled sand washing tail mud are removed.
2) Solid water glass with the modulus of 1mol is dissolved in clear water, and the mass ratio of the solid water glass to the clear water is 1:5 (1 mol of solid water glass: clear water), standing until the mixed solution of the exciting agent is cooled to normal temperature for standby;
3) Placing the stock solution of the cement foaming agent into a microwave oven, setting the microwave power to be 500W, heating for 30 seconds, diluting the foaming agent by using clear water with the mass of 30 times of that of the foaming agent, and uniformly mixing to obtain foaming liquid;
4) According to the mass ratio, the materials of each group are measured, the sand washing tail mud is 25 parts, the slag is 50 parts, the foaming liquid is 8.2 parts, the mixed solution of the exciting agent is 36 parts, the fiber is 2.1 parts, and the additive is 0.045 parts. Firstly, adding sand washing tail mud, slag and an additive into a mortar stirring pot, and stirring for 1min at a rotating speed of 62+/-5 r/min to obtain mixed powder, wherein the slag is S95 slag, and the additive is sodium chloride and calcium hydroxide; secondly, uniformly dispersing the fibers, putting the fibers into the mixed powder, and stirring the mixed powder for 2 minutes at the rotating speed of 62+/-5 r/min to obtain a mixed dry material; then pouring the mixed solution of the exciting agent into the mixed dry material, and stirring for 2min at the rotating speed of 62+/-5 r/min to prepare mixed slurry; then, preparing the prepared foaming liquid into uniform foam on site through a foaming machine, adding the foam into the mixed slurry, stirring for 1min at a rotating speed of 62+/-5 r/min, and then taking down a stirring pot tool to scrape materials remained on the pot wall and the pot bottom; finally, placing the mixture back into a stirring pot to continuously stir at the rotating speed of 62+/-5 r/min for 1.5min, ensuring that the foam is uniformly dispersed in the mixed slurry, and obtaining the alkali-activated sand washing tail mud foam concrete slurry when the final mixture presents a creamy fluid consistency which is easy to pour;
5) And (3) injection molding the obtained cream alkali-activated sand-washing tail mud foam concrete slurry, placing the slurry in a laboratory environment (the temperature is 23+/-2 ℃ and the relative humidity is 65+/-15%) for 1d, curing for 28d after hardening and demolding, and placing the slurry in a standard curing room environment (the temperature is 20+/-2 ℃ and the relative humidity is more than 95%) to prepare the low-carbon shrinkage-inhibiting high-alkali-activated sand-washing tail mud foam concrete.
It should be noted that the use of low activity sand washing tailings may also lead to the problem of significantly reduced strength of alkali-activated foam concrete. Thus, the performance of the foam concrete depends largely on the quality of the foaming agent, and in order to prove that the alkali-activated sand washing tail mud foam concrete of the example has the characteristics of low shrinkage and high strength, the following comparative examples are designed.
Comparative example 1: the alkali-activated sand washing tail mud foam concrete cement foaming agent of the scheme is not subjected to pretreatment and is not doped with fibers and additives, and the proportioning quality and the stirring process of other materials are the same as those of the embodiment 1.
Comparative example 2: the alkali-activated sand washing tail mud foam concrete cement foaming agent of the scheme is not subjected to pretreatment, the foaming agent is diluted by 80 times of clear water to obtain foaming liquid, fibers and additives are not mixed, and the proportioning quality and the stirring process of other materials are the same as those of the example 1.
Control example 3: the foam concrete of this scheme is cement-based foam concrete, and its water-cement ratio is the same as that of example 1.
Comparative example 4: the alkali-activated foam concrete of the scheme does not use sand washing tail mud to replace slag, in addition, the cement foaming agent is not pretreated and does not contain fibers and additives, and the proportioning quality and the stirring process of other materials are the same as those of the embodiment 1.
After the alkali-activated sand-washing tail mud foam concrete and the cement-based foam concrete are cured for 28 days, the dry density and the compressive strength of the alkali-activated sand-washing tail mud foam concrete are tested according to the specification JGT 266-2011 foam concrete, and the drying shrinkage of the alkali-activated sand-washing tail mud foam concrete at 48 hours is tested according to the test method of the autoclaved aerated concrete performance test of the specification GB/T11969-2020. The test results of the performance of the foam concrete of the sand washing tail mud obtained in the examples and the comparative examples are shown in the table below.
From the dry density data, it is clear that the comparative example 2 cannot be molded in five groups of foam concrete, and the dry density of the other four groups of foam concrete is 570-633 kg/m 3. The alkali-activated sand-washing tail mud foam concrete of comparative example 2 could not be formed mainly because the foaming agent was not subjected to microwave treatment, the concentration of the foaming liquid was too low and the bubbles generated by the foaming agent without adding the additive were not stable enough due to poor quality of the foaming agent, and the foam was largely destroyed during stirring.
From the compressive strength data, the compressive strength of example 1 was significantly more excellent than that of the conventional cement paste foam concrete (comparative example 3) in the molded foam concrete, indicating that it has a high strength. Compared with comparative example 1, the mechanical properties of the cement foaming agent are also obviously improved, which indicates that the mechanical properties of the alkali-activated sand washing tail mud foam concrete can be improved by the pretreatment of the cement foaming agent and the doping of the fibers and the admixture.
From the drying shrinkage data, the drying shrinkage of the molded foam concrete was significantly reduced in example 1 compared to comparative examples 1 and 4, indicating that the alkali-activated sand-washed tail mud foam concrete was inhibited from drying shrinkage by incorporating sand-washed tail mud, a pretreatment cement foaming agent, a fiber and an admixture.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. The preparation method of the low-carbon shrinkage-inhibiting high-alkali excitation sand washing tail mud foam concrete is characterized by comprising the following steps of:
1) The sand washing tail mud mainly comprises stone powder and mud, wherein the stone powder content is less than or equal to 50%, the mud content is more than or equal to 50%, the sand washing tail mud is dried at 100 ℃ for 12 h and ball-milled for 20-60 min, and particles with the particle diameter of more than or equal to 3mm in the ball-milled sand washing tail mud are removed for standby;
2) Dissolving an exciting agent in clear water, standing until the mixed solution of the exciting agent is cooled to normal temperature for standby;
3) Diluting the pretreated cement foaming agent with clear water to obtain foaming liquid, wherein the dilution factor is 30-60 times (the foaming liquid is uniformly mixed with clear water with the mass of 30-60 times);
4) Metering the materials of each group according to the mass ratio for standby: adding sand washing tail mud, slag and an additive into a mortar stirring pot, and stirring for 1min at a rotating speed of 62+/-5 r/min to obtain mixed powder, wherein the slag is S95 slag, and the additive is one or more of sodium chloride, sodium hydroxide, sodium carbonate and calcium hydroxide; uniformly dispersing the fibers, putting the fibers into the mixed powder, and stirring for 2min at the rotating speed of 62+/-5 r/min to obtain a mixed dry material; pouring the mixed solution of the exciting agent into the mixed dry material, and stirring for 2min at the rotating speed of 62+/-5 r/min to prepare mixed slurry; preparing the prepared foaming liquid into uniform foam through a foaming machine, adding the foam into the mixed slurry, stirring for 1min at a rotating speed of 62+/-5 r/min, and then taking down a stirring pot tool to scrape materials remained on the pot wall and the pot bottom; placing the mixture back into a stirring pot to continuously stir at the rotating speed of 62+/-5 r/min for 1-2 min, ensuring that the foam is uniformly dispersed in the mixed slurry, and obtaining the alkali-activated sand washing tail mud foam concrete slurry when the final mixture presents a creamy fluid consistency which is easy to pour;
5) And (3) injection molding the obtained cream alkali-activated sand-washing tail mud foam concrete slurry, placing the slurry in an environment with the temperature of 23+/-2 ℃ and the relative humidity of 65+/-15% for 1d, curing for 28d after the slurry is hardened and disassembled, and placing the slurry in an environment with the temperature of 20+/-2 ℃ and the relative humidity of more than 95% to prepare the low-carbon shrinkage-inhibiting high-alkali-activated sand-washing tail mud foam concrete.
2. The method for preparing the low-carbon shrinkage-inhibiting high-alkali-excitation sand-washing tail mud foam concrete is characterized in that in the step 2), the exciting agent is solid water glass, the solid content is 100%, and the modulus is 1-1.5 mol.
3. The method for preparing the low-carbon shrinkage-inhibiting high-alkali-activated sand-washing tail mud foam concrete, as claimed in claim 1, is characterized in that in the step 3), the model of the cement foaming agent is LG-2258, the production unit is Shandong Yousu chemical technology Co., ltd, and the pretreatment cement foaming agent is obtained by the following steps: and (3) placing the stock solution of the cement foaming agent into a microwave oven, setting the microwave power to be 500W, and heating for 30-40 seconds.
4. The method for preparing the low-carbon shrinkage-inhibiting high-alkali-activated sand-washing tail mud foam concrete according to claim 1, wherein the fibers in the step 4) are fibers formed by mixing glass fibers and modified waste coffee grounds according to a ratio of 2:1.
5. The method for preparing the low-carbon shrinkage-inhibiting high-alkali excitation sand washing tail mud foam concrete as claimed in claim 4, which is characterized in that the modified waste coffee grounds are obtained by the following steps: the waste coffee grounds are placed in 3mol/L sodium hydroxide solution for soaking for 1h, and then the soaked waste coffee grounds are placed in a 100 ℃ oven for drying to constant weight.
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| CN202410256457.2A CN118084532A (en) | 2024-03-06 | 2024-03-06 | Preparation method of low-carbon shrinkage-inhibiting high-alkali-excitation sand-washing tail mud foam concrete |
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