CN111116117B - Chemically-excited sulfur-fixing ash-slag-based foamed light soil - Google Patents
Chemically-excited sulfur-fixing ash-slag-based foamed light soil Download PDFInfo
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- CN111116117B CN111116117B CN201911311027.1A CN201911311027A CN111116117B CN 111116117 B CN111116117 B CN 111116117B CN 201911311027 A CN201911311027 A CN 201911311027A CN 111116117 B CN111116117 B CN 111116117B
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- 239000002689 soil Substances 0.000 title claims abstract description 65
- 239000002893 slag Substances 0.000 title abstract description 21
- 239000002956 ash Substances 0.000 claims abstract description 74
- 239000004568 cement Substances 0.000 claims abstract description 37
- 239000010881 fly ash Substances 0.000 claims abstract description 34
- 239000006260 foam Substances 0.000 claims abstract description 34
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 34
- 239000011593 sulfur Substances 0.000 claims abstract description 34
- 239000007787 solid Substances 0.000 claims abstract description 32
- 239000004088 foaming agent Substances 0.000 claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Tris Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 4
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000004140 cleaning Methods 0.000 abstract description 5
- 239000002910 solid waste Substances 0.000 abstract description 5
- 239000011268 mixed slurry Substances 0.000 description 9
- 239000012190 activator Substances 0.000 description 6
- 238000010790 dilution Methods 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000006011 modification reaction Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001737 promoting Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- -1 alcohol amine Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011031 large scale production Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000004430 oxygen atoms Chemical group O* 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000002195 synergetic Effects 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
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to a chemically excited sulfur fixation ash slag based foam light soil which is prepared from the following raw materials in parts by mass: 88-165 parts of fluidized bed combustion ash, 260-293 parts of cement, 29-55 parts of fly ash, 0.4-0.5 part of excitant, 0.7-0.8 part of foaming agent and 180-190 parts of water. The invention applies the solid waste of the thermal power plant, namely the solid sulfur-fixing ash slag, to the foamed light soil for the first time, provides a feasible method for solving the problem of stockpiling of the solid sulfur-fixing ash slag, and promotes the utilization and development of the clean energy technology of the circulating fluidized bed combustion. The invention adopts the blending of the fly ash and the sulfur-fixing ash, can reduce the expansibility of the light soil of the sulfur-fixing ash residue, and lead the expansion stable period of the light soil of the sulfur-fixing ash residue to be advanced, and reduce the damage of the expansibility of the sulfur-fixing ash residue to the foamed light soil.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to chemically-excited sulfur fixation ash slag based foamed light soil.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The foamed light soil is a light engineering material with a large number of closed air holes, which is obtained by adding a foam group obtained by foaming a foaming agent into a cementing material and maintaining. The bridge pier has the advantages of light weight, good integrity, adjustable strength and density, high fluidity, good heat insulation, sound insulation, waterproof performance, self-supporting performance after solidification and the like, can reduce the settlement difference of new and old road beds when used for road bed filling during road widening, saves road land, shortens construction period, can greatly relieve the problem of bridge pier jumping when used for bridge pier back filling, and simultaneously reduces the horizontal force on bridge pier structures. The existing foamed light soil mostly uses cement and fly ash as cementing materials, has high production cost and is not suitable for large-scale implementation.
With the development of clean coal burning technology, the circulating fluidized bed combustion technology is rapidly developed in the field of thermal power generation due to the advantages of high efficiency, low pollution and clean production and wide adaptability to fuels. However, the discharge amount of solid waste, namely the solid sulfur-fixing ash slag generated by the circulating fluidized bed combustion technology is far higher than that of the fly ash generated by a pulverized coal boiler, and the untreated solid sulfur ash slag has the problems of poor workability and later expansion caused by the application of the untreated solid sulfur ash slag to a cement-based material due to the physicochemical properties of rough particles, loose and porous surface, low chemical activity, high sulfur and high calcium and the like, so that the large-scale utilization of the solid sulfur ash slag is restricted.
Disclosure of Invention
In order to overcome the problems, the invention provides a chemically-activated sulfur-fixation ash-based foam light soil. The invention applies the solid waste of the thermal power plant, namely the solid sulfur-fixing ash slag, to the foamed light soil for the first time, provides a feasible method for solving the problem of stockpiling of the solid sulfur-fixing ash slag, and promotes the utilization and development of the clean energy technology of the circulating fluidized bed combustion.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a chemically-excited sulfur-fixing ash-based foam light soil is prepared from the following raw materials in parts by weight: 88-165 parts of fluidized bed combustion ash, 260-293 parts of cement, 29-55 parts of fly ash, 0.4-0.5 part of excitant, 0.7-0.8 part of foaming agent and 180-190 parts of water.
According to the inventionThe principle is as follows: the invention takes cement, solid sulfur ash, fly ash and the like as basic raw materials, and the strength source mainly comprises the following parts: (1) c in cement3S、C4S、C3A、C4Hydration of AF to C-S-H and Ca (OH)2. (2) The residual gypsum in the sulfur-fixing ash reacts with C-A-H in the step (1) to generate ettringite which provides initial strength for the light soil. (3) The polyalcohol amines are reacted with Ca in cement through oxygen atoms on hydroxyl groups in alcohol amine molecules2+、Fe3+The metal ions are complexed to produce amine-calcium or amine-iron complex, thereby promoting C in the cement3A、C4AF and C3S and the like, thereby promoting the formation of hydration products such as C-S-H, CH, Aft, AFm and the like, improving the pore structure of hardened cement paste, and influencing the micro morphology of the cement hydration products, thereby influencing the pore structure of the cement paste.
In some embodiments, the composition is prepared from the following raw materials in parts by weight: 88-125 parts of solid sulfur clinker, 260-275 parts of cement, 29-42 parts of fly ash, 0.4-0.45 part of excitant, 0.7-0.8 part of foaming agent and 180-185 parts of water. The application utilizes the synergistic effect of blending the fly ash and the solid sulfur ash, and improves the later strength of the foaming agent light soil.
In some embodiments, the composition is prepared from the following raw materials in parts by weight: 125-165 parts of solid sulfur clinker, 275-293 parts of cement, 42-55 parts of fly ash, 0.45-0.5 part of excitant, 0.7-0.9 part of foaming agent and 185-190 parts of water. The polyalcohol amine excitant can improve the strength of the foaming agent light soil at a lower mixing amount, so the cost is lower.
The alkali activator is adopted, so that the cost is high, and the alkali activator is incompatible with the composite protein foaming agent, so that the defoaming is caused, and the density is improved.
In some embodiments, the content of CaO in the clinker is 20-41%, and SiO is235-50% of SO31 to 10 percent of Al2O3The content is 15-25%, and the rest is other impurities. The cost of the foamed light soil can be greatly reduced, and the later strength of the foamed light soil can be improved.
In some embodiments, the activator consists of triisopropanolamine, diethanolisopropanolamine, triethanolamine in a ratio of 1:1: 1. The research of the application finds that: the combination of the polyalcohol amine excitant and the solid sulfur ash has good adaptability, and the strength and the drying shrinkage performance of the foamed lightweight soil can be better improved.
In some embodiments, the foaming agent has a dilution factor of 40 to 50 times, a foaming factor of 20 to 30 times, a foam density of 40g to 50g/L, and a defoaming rate of not more than 7%. The foam is prepared by diluting a foaming agent and foaming by a high-pressure air method.
In some embodiments, the wet density of the fluidized bed combustion ash based foam light soil is 550-650 g/L, and the 28d compressive strength of the foamed light soil is not lower than 1.2 MPa. The cost of the foamed light soil can be greatly reduced, and the later strength of the foamed light soil can be improved.
The invention also provides a preparation method of the chemically excited sulfur fixation ash slag based foam light soil, which comprises the following steps:
dry-mixing and uniformly mixing the solid sulfur ash, the fly ash and the cement;
adding water, wet-mixing, adding exciting agent, and mixing;
then adding foam, uniformly mixing, adjusting the density of the slurry to 550-650 g/L, and testing the flow value to form slurry;
pouring the slurry into a mold, curing and demolding to obtain the sulfur-fixing ash-based foamed light soil.
The invention adopts the blending of the fly ash and the sulfur-fixing ash, can reduce the expansibility of the light soil of the sulfur-fixing ash slag, and lead the expansion stabilization period of the light soil of the sulfur-fixing ash slag to be advanced, thereby reducing the damage to the foamed light soil caused by the expansibility of the sulfur-fixing ash slag, simultaneously the drying shrinkage of the foamed light soil can offset the expansion of a part of the sulfur-fixing ash slag, and being more beneficial to the application of the sulfur-fixing ash slag in cement-based materials.
In some embodiments, the dry-mix conditions are: stirring at the rotating speed of 1300-1500 rpm for 3-5 min; the wet mixing conditions are as follows: stirring at the rotating speed of 1300-1500 rpm for 3-5 min; adding an exciting agent, and stirring at the rotating speed of 1300-1500 rpm for 3-5 min; after the foam is added, stirring is carried out for 2-3 min at the rotating speed of 600-800 rpm, so that the mixing efficiency of the materials is effectively improved through multiple stirring and mixing, and the formed foam light soil has good performance.
The invention also provides application of any one of the chemically-excited sulfur-fixation ash slag-based foamed lightweight soil in the fields of buildings, fire resistance, heat insulation, filtration, water seepage resistance and resistance belt materials of airfield runways.
The invention has the beneficial effects that:
(1) the invention applies the solid waste of the thermal power plant, namely the solid sulfur-fixing ash slag, to the foamed light soil for the first time, provides a feasible method for solving the problem of stockpiling of the solid sulfur-fixing ash slag, and promotes the utilization and development of the clean energy technology of the circulating fluidized bed combustion.
(2) The fly ash and the sulfur-fixation ash are mixed, so that the problem of low strength when the sulfur-fixation ash is mixed singly can be solved, the later strength of the foamed light soil is improved, the expansibility of the sulfur-fixation ash light soil can be reduced, the expansion stability of the sulfur-fixation ash-based light soil is advanced, the damage to the foamed light soil caused by the expansibility of the sulfur-fixation ash can be reduced, the expansion of a part of the sulfur-fixation ash can be counteracted by the drying shrinkage of the foamed light soil, and the application of the sulfur-fixation ash in cement-based materials is facilitated.
(3) The conventional foamed light soil adopts cement and fly ash as cementing materials, has higher production cost and is not suitable for large-scale implementation. The invention adopts industrial solid waste solid sulfur ash to replace partial cementing material, greatly reduces the manufacturing cost of the foamed light soil and is easy to prepare on the premise that the strength meets the embankment filling strength requirement (the requirement that the 28d unconfined compressive strength is more than or equal to 0.6Mpa in the highway subgrade design specification (JTGD 30-2015) by adopting the foamed light soil as the embankment material).
(4) The operation method is simple, low in cost, universal and easy for large-scale production.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background technology, the problems of poor workability and later expansion caused by the application of the prior solid sulfur ash in cement-based materials due to the physicochemical properties of rough particles, loose and porous surface, low chemical activity, high sulfur and high calcium and the like are solved. Therefore, the invention provides a sulfur-fixing ash-based foam light soil which is prepared from the following raw materials in parts by mass: 88-165 parts of fluidized bed combustion ash, 260-293 parts of cement, 29-55 parts of fly ash, 0.4-0.5 part of an activator, 35-40 parts of foam and 180-190 parts of water.
In some embodiments, the ratio of the solid sulfur ash to the fly ash is 2: 1-4: 1, and the previous experiments show that the solid sulfur ash and the fly ash can fully react with each other.
In some embodiments, the fineness of the fluidized bed combustion ash is required to be 1mm square-hole sieve, and the fluidized bed combustion ash with the fineness is easy to stir and can fully react with other raw materials. The CaO content of the fluidized bed combustion ash is 20-41%, and SiO content235-50% of SO31 to 10 percent of Al2O3The content is 15-25%.
In some embodiments, the fly ash is a class i fly ash.
In some embodiments, the activator consists of triisopropanolamine, diethanolisopropanolamine, triethanolamine in a ratio of 1:1: 1.
In some embodiments, the foaming agent has a dilution factor of 40 to 50 times, a foaming factor of 20 to 30 times, a foam density of 40g to 50g/L, and a defoaming rate of not more than 7%.
In some embodiments, the wet density of the fluidized bed combustion ash based foam light soil is 550-650 g/L, and the 28d compressive strength of the foamed light soil is not lower than 1.2 MPa.
In some embodiments, the method for preparing the fluidized bed combustion ash based foam light soil comprises the following steps:
(1) weighing a certain mass part of solid sulfur ash, fly ash, cement and foam raw materials;
(2) firstly stirring the solid sulfur ash, the fly ash and the cement in the step (1) at the rotating speed of 1300-1500 rpm for 3-5 min;
(3) adding water into the dry material stirred in advance in the step (2), and stirring at the rotating speed of 1300-1500 rpm for 3-5 min;
(4) and (4) adding the weighed exciting agent into the mixed slurry obtained in the step (3), and stirring at the rotating speed of 1300-1500 rpm for 3-5 min.
(5) And (3) foaming the weighed foaming agent with the dilution multiple of 40-50 times by a high-pressure air method to prepare foam, then adding the foam into the mixed slurry obtained in the step (4), and stirring at the rotating speed of 600-800 rpm for 2-3 min.
(6) Adjusting the density of the mixed slurry to 550-650 g/L and testing the flow value until the flow value reaches 18 +/-1 cm.
(7) Pouring the obtained slurry into a prepared test mold, covering and curing at normal temperature, demolding after 24 hours, sealing and curing at normal temperature to obtain the sulfur fixation clinker based foamed lightweight soil.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
In the following examples, the foaming agent is a composite foaming agent purchased from cigarette Taiwan galloon building energy saving technology ltd;
the exciting agent consists of triisopropanolamine, diethanolisopropanolamine and triethanolamine in the ratio of 1:1: 1.
In the solid sulfur clinker, the CaO content is 30 percent, and SiO is2Content of 42%, SO35% of Al2O3The content is 20 percent, and the rest is other impurities.
The fly ash is I-grade fly ash.
Example 1
A preparation method of the fluidized bed combustion ash based foam light soil comprises the following steps:
(1) weighing 116 parts of fluidized bed combustion ash, 39 parts of fly ash, 260 parts of cement, 0.5 part of excitant, 186 parts of water and 0.7 part of foaming agent;
(2) firstly stirring the solid sulfur ash, the fly ash and the cement in the step (1) at the rotating speed of 1400rpm for 3 min;
(3) adding water into the dry material stirred in advance in the step (2), and stirring at the rotating speed of 1400rpm for 3 min;
(4) adding an exciting agent into the cement slurry stirred in the step (3), and stirring at the rotating speed of 1400rpm for 3 min;
(5) and (3) foaming by a high-pressure air method after the dilution multiple of the foaming agent is 40 times to prepare foam, then adding the foam into the mixed slurry obtained in the step (3), and stirring for 2min at the rotating speed of 700 rpm.
(6) The mixed slurry density was adjusted to 600g/L and the flow value was measured until the flow value reached 18. + -.1 cm.
(7) Pouring the obtained slurry into a prepared test mold, covering and curing at normal temperature, demolding after 24 hours, sealing and curing at normal temperature to obtain the sulfur fixation clinker based foamed lightweight soil.
The test piece of the sulfur-fixing ash-based foamed lightweight soil prepared in the embodiment is subjected to a compressive strength measurement test, and the 28d compressive strength of the test piece is 1.2 MPa.
Example 2
A preparation method of the fluidized bed combustion ash based foam light soil comprises the following steps:
(1) weighing 101 parts of fluidized bed combustion ash, 34 parts of fly ash, 275 parts of cement, 191 parts of water, 0.5 part of exciting agent and 0.7 part of foaming agent;
(2) firstly stirring the solid sulfur ash, the fly ash and the cement in the step (1) at the rotating speed of 1400rpm for 3 min;
(3) adding water into the dry material stirred in advance in the step (2), and stirring at the rotating speed of 1400rpm for 3 min;
(4) adding an exciting agent into the cement slurry stirred in the step (3), and stirring at the rotating speed of 1400rpm for 3 min;
(5) and (3) foaming by a high-pressure air method after the dilution multiple of the foaming agent is 40 times to prepare foam, then adding the foam into the mixed slurry obtained in the step (3), and stirring for 2min at the rotating speed of 700 rpm.
(6) The mixed slurry density was adjusted to 600g/L and the flow value was measured until the flow value reached 18. + -.1 cm.
(7) Pouring the obtained slurry into a prepared test mold, covering and curing at normal temperature, demolding after 24 hours, sealing and curing at normal temperature to obtain the sulfur fixation clinker based foamed lightweight soil.
The test piece of the sulfur-fixing ash-based foamed lightweight soil prepared in the embodiment is subjected to a compressive strength measurement test, and the 28d compressive strength of the test piece is 1.32 MPa.
Example 3
A preparation method of the fluidized bed combustion ash based foam light soil comprises the following steps:
(1) weighing 84 parts of fluidized bed combustion ash, 22 parts of fly ash, 290 parts of cement, 0.5 part of excitant, 189 parts of water and 0.8 part of foaming agent;
(2) firstly stirring the solid sulfur ash, the fly ash and the cement in the step (1) at the rotating speed of 1400rpm for 3 min;
(3) adding water into the dry material stirred in advance in the step (2), and stirring at the rotating speed of 1400rpm for 3 min;
(4) adding an exciting agent into the cement slurry stirred in the step (3), and stirring at the rotating speed of 1400rpm for 3 min;
(5) and (3) foaming by a high-pressure air method after the dilution multiple of the foaming agent is 40 times to prepare foam, then adding the foam into the mixed slurry obtained in the step (3), stirring for 2min at the rotating speed of 700rpm, and testing the flow value and the wet density.
(6) The mixed slurry density was adjusted to 600g/L and the flow value was measured until the flow value reached 18. + -.1 cm.
(7) Pouring the obtained slurry into a prepared test mold, covering and curing at normal temperature, demolding after 24 hours, sealing and curing at normal temperature to obtain the sulfur fixation clinker based foamed lightweight soil.
The test piece of the sulfur-fixing ash-based foamed lightweight soil prepared in the embodiment is subjected to a compressive strength measurement test, and the 28d compressive strength of the test piece is 1.4 MPa.
Comparative example 1 (when the amount of cement blended is low)
The difference from the embodiment 1 is that the raw material components and the weight portions are 149 portions of the solid sulfur clinker, 50 portions of the fly ash, 220 portions of the cement, 181 portions of the water, 0.5 portion of the excitant and 0.6 portion of the foaming agent.
The fluidized bed combustion ash based foam lightweight soil obtained in the embodiment is poured into a test mold for strength test, and the 28d compressive strength is 0.63MPa, and the surface of the test piece has the phenomenon of volume instability.
Comparative example 2 (without activator)
The difference from the embodiment 1 is that the raw material components and the weight portions are 116 portions of the solid sulfur clinker, 39 portions of the fly ash, 260 portions of the cement, 186 portions of the water and 0.7 portion of the foaming agent.
The test piece of the sulfur-fixing ash-based foamed lightweight soil prepared in the embodiment is subjected to a compressive strength test, and the 28-day compressive strength of the test piece is 1.01 MPa.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. The chemically excited sulfur-fixing ash-based foam light soil is characterized by being prepared from the following raw materials in parts by weight: 88-165 parts of fluidized bed combustion ash, 260-293 parts of cement, 29-55 parts of fly ash, 0.4-0.5 part of excitant, 0.7-0.8 part of foaming agent and 180-190 parts of water;
in the solid sulfur clinker, the content of CaO is 20 to 41 percent, and SiO is235-50% of SO31 to 10 percent of Al2O3The content is 15 to 25 percent;
the exciting agent consists of triisopropanolamine, diethanolisopropanolamine and triethanolamine in a ratio of 1:1: 1;
the foaming agent is diluted by 40-50 times, the foaming ratio is 20-30 times, the foam density is 40-50 g/L, and the defoaming rate is not more than 7%;
the wet density of the fluidized bed combustion ash based foam light soil is 550-650 g/L, and the 28d compressive strength of the foamed light soil is not lower than 1.2 MPa.
2. The chemically activated clinker-based foamed lightweight soil as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 88-125 parts of solid sulfur clinker, 260-275 parts of cement, 29-42 parts of fly ash, 0.4-0.45 part of excitant, 0.7-0.8 part of foaming agent and 180-185 parts of water.
3. The chemically activated clinker-based foamed lightweight soil as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 125-165 parts of solid sulfur clinker, 275-293 parts of cement, 42-55 parts of fly ash, 0.45-0.5 part of excitant, 0.7-0.8 part of foaming agent and 185-190 parts of water.
4. The process for preparing chemically activated clinker-based foamed lightweight soil according to any one of claims 1 to 3, comprising:
dry-mixing the solid sulfur ash, the fly ash and the cement, and uniformly mixing;
adding water, wet-mixing, adding exciting agent, and mixing;
then adding foam, uniformly mixing, adjusting the density of the slurry to 550-650 g/L, and testing the flow value to form slurry;
pouring the slurry into a mold, curing and demolding to obtain the sulfur-fixing ash-based foamed light soil.
5. The method for preparing the chemically activated clinker-based foamed lightweight soil according to claim 4, wherein the dry mixing conditions are as follows: stirring at the rotating speed of 1300-1500 rpm for 3-5 min;
or the wet mixing conditions are as follows: stirring at the rotating speed of 1300-1500 rpm for 3-5 min;
or after adding the exciting agent, stirring for 3-5 min at the rotating speed of 1300-1500 rpm;
or adding foam and stirring for 2-3 min at the rotating speed of 600-800 rpm.
6. Use of the chemically activated clinker-based foamed lightweight soil according to any one of claims 1 to 3 in the fields of construction, fire insulation, filtration, water seepage resistance, and resistance belt material for airport runways.
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| CN111995304A (en) * | 2020-08-18 | 2020-11-27 | 山东理工大学 | Method for preparing foam concrete by utilizing solid sulfur ash |
| CN113087457A (en) * | 2021-02-23 | 2021-07-09 | 中交武汉港湾工程设计研究院有限公司 | Foamed light soil using coal cinder as raw material and preparation method thereof |
| CN113754371B (en) * | 2021-08-30 | 2022-10-21 | 广东盛瑞科技股份有限公司 | Foamed light soil with high stone powder content and preparation method thereof |
| CN113816678A (en) * | 2021-09-23 | 2021-12-21 | 山东大学 | Foam light material utilizing dust removal ash solid waste and preparation method and application thereof |
| CN114105535B (en) * | 2021-11-26 | 2023-04-07 | 武汉钢铁有限公司 | Method for preparing light energy-saving wall material by sintering desulfurized ash through high-doping semidry method |
| CN115417652A (en) * | 2022-07-19 | 2022-12-02 | 山东大学 | Yellow flooding area silt solid waste base soil curing agent and application thereof |
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