CN115572128A - Concrete containing waste incineration fly ash and preparation method thereof - Google Patents
Concrete containing waste incineration fly ash and preparation method thereof Download PDFInfo
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- CN115572128A CN115572128A CN202211254405.9A CN202211254405A CN115572128A CN 115572128 A CN115572128 A CN 115572128A CN 202211254405 A CN202211254405 A CN 202211254405A CN 115572128 A CN115572128 A CN 115572128A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides a concrete containing waste incineration fly ash and a preparation method thereof, wherein the concrete comprises the following raw materials: 300-400 parts of cement, 50-60 parts of waste incineration fly ash, 900-1000 parts of coarse aggregate, 700-800 parts of fine aggregate, 40-50 parts of curing reinforcing agent, 150-180 parts of water, 0.3-0.5 part of retarder and 7-9 parts of water reducing agent; curing reinforcing agent raw materials: 40-50 parts of metakaolin, 8-10 parts of nano alumina powder, 25-30 parts of waterborne epoxy resin-polyurethane emulsion and 3-5 parts of diethanol monoisopropanolamine. Compared with the prior art, the invention realizes the high-efficiency resource conversion and utilization of the hazardous waste, namely the waste incineration fly ash; the curing reinforcing agent can improve the hardness of concrete and has a curing effect on heavy metals; the leaching concentration of heavy metal in the prepared concrete is far lower than the national solid waste leaching toxicity identification standard, and the strength of the cured concrete is higher.
Description
Technical Field
The invention relates to resource recycling of solid waste, in particular to concrete containing waste incineration fly ash and a preparation method thereof.
Background
The waste incineration fly ash is a dust-like substance captured from a fluidized bed or a grate furnace auxiliary flue in the incineration power generation process of household waste. The particles are fine, and the heavy metal and trace insoluble dioxin toxic substances are contained by about 0.5 to 1.5 percent. Due to the toxicity characteristics, the refuse incineration fly ash is listed in the national hazardous waste record and belongs to a managed hazardous waste. Except toxic substances, the fly ash from the incineration of the household garbage comprises the main components of CaO and SiO 2 、Al 2 O 3 The material has certain gelling activity similar to the composition of the common auxiliary gelling materials such as fly ash, mineral powder and the like, so the material is also a potential building material raw material.
However, the concentrations of heavy metals Cr, cd, cu and Pb in the fly ash leachate generated by burning the household garbage are all higher than the identification standard of domestic hazardous wastes, and the direct discharge or utilization can cause secondary pollution to the environment, and an effective harmless treatment method must be adopted. The existence of toxic substances seriously limits the effective resource utilization of the waste incineration fly ash.
In the prior art, the waste incineration fly ash is transported to a safe landfill site for landfill after being solidified by a chelating agent and cement, so that the storage capacity of the safe landfill site is greatly occupied, and the cost is high.
Invention inner solution
The invention aims to provide concrete containing waste incineration fly ash and a preparation method thereof. The invention can recycle the solid waste such as the waste incineration fly ash in a recycling and environment-friendly way, and the concrete has higher strength and good heavy metal ion seepage resistance after being formed.
The specific technical scheme of the invention is as follows:
the concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: 300-400 parts of cement, 50-60 parts of waste incineration fly ash, 900-1000 parts of coarse aggregate, 700-800 parts of fine aggregate, 40-50 parts of curing reinforcing agent, 150-180 parts of water, 0.3-0.5 part of retarder and 7-9 parts of water reducing agent.
The curing reinforcing agent comprises the following raw materials in parts by mass: 40-50 parts of metakaolin, 8-10 parts of nano alumina powder, 25-30 parts of waterborne epoxy resin-polyurethane emulsion and 3-5 parts of diethanol monoisopropanolamine. The curing reinforcing agent can solidify heavy metal ions in the waste incineration fly ash, and can excite the activity of the waste incineration fly ash, promote the hydration rate of cement and improve the strength of concrete.
The preparation method of the curing reinforcing agent comprises the following steps:
1) Adding metakaolin, nano alumina powder and diethanol monoisopropanolamine in the formula ratio into an acetone solution containing a silane coupling agent, uniformly stirring, and then drying;
2) Putting the mixture treated in the step 1) and the polyurethane-epoxy resin emulsion with the formula amount into a high-speed dispersion machine, and stirring the mixture and the polyurethane-epoxy resin emulsion until the mixture is uniform.
The fineness of the metakaolin is 200 meshes.
The dosage of the acetone solution containing the silane coupling agent is 20-25% of the total weight of the metakaolin, the nano alumina powder and the diethanol monoisopropanolamine;
in the acetone solution containing the silane coupling agent, the mass concentration of the silane coupling agent is 1.0-1.5%, and the silane coupling agent is selected from gamma-glycidyl ether oxypropyl trimethoxy silane.
Stirring uniformly in the step 1), wherein the speed is 1000-1200r/min;
the stirring speed in the step 2) is as follows: 2000-3000r/min.
The cement is any one or more of portland cement, aluminate cement or sulphoaluminate cement, preferably portland cement, and the portland cement is P.O42.5 ordinary portland cement.
Before the waste incineration fly ash is used, drying and sieving the fly ash in advance to remove large particles and impurities in the fly ash; the waste incineration fly ash is from Xiangyang Enfei environmental protection energy Co.
The fine aggregate is river sand, the fineness modulus is 1.8, and the mud content is 3%;
the coarse aggregate is secondary stone, wherein the mass of the stone with the thickness of 5mm-10mm accounts for 40%, and the mass of the stone with the thickness of 10mm-20mm accounts for 60%;
the retarder is any one or more of sodium gluconate, white sugar and citric acid.
The water reducing agent is a polycarboxylic acid water reducing agent, preferably a PC150 polycarboxylic acid water reducing agent produced by Xianyang sea snail new material science and technology limited.
The invention provides a preparation method of concrete containing waste incineration fly ash, which comprises the following steps: adding the cement, the waste incineration fly ash, the coarse aggregate, the fine aggregate, the curing reinforcing agent and the retarder which are in the formula ratio into a concrete mixer for premixing; and adding water and a water reducing agent in a formula amount while stirring, stirring uniformly, and discharging.
The pre-mixing time is 2-5min; the mixing time is 3-6min.
The main active component of metakaolin is Al 2 O 3 And SiO 2 The volcanic ash has a thermodynamic metastable structure, can be depolymerized under the alkali excitation condition and combined with other ions to form a net-shaped structure, and therefore has better volcanic ash activity. A certain amount of metakaolin is doped into concrete, so that the metakaolin and calcium hydroxide generated by cement hydration can generate a pozzolanic reaction, the cement hydration rate is promoted, and the early strength of the concrete is increased. A large amount of Ca (OH) is generally collected between the hardened cement paste and the aggregate 2 The crystal and the directionally arranged structures become weaker links in concrete. Metakaolin has a large surface energy due to a large number of broken chemical bonds, and a plurality of pores are left in the internal structure, so that metakaolin has strong volcanic ash activity and can absorb Ca (OH) 2 And has secondary hydration reaction with the calcium carbonate to generate more hydration products such as C-S-H gel and the like, and the interface transition Ca (OH) is reduced 2 The orientation degree of the concrete improves the mechanical property and the durability of the concrete. The metakaolin contains a large amount of ultrafine particles and is rich in active Si and Al, the generation amount of Al-phase-containing products can be obviously improved in the cement hydration process, the Ca/Si of the products can be reduced, the pore structure of the refined products can be improved, and the generation amount of ettringite and gel in the hydration products, especially the metakaolinThe Al-phase-containing gel reduces Ca/Si of the gel, and increases the structural compactness of the product, thereby improving the heavy metal curing capability.
The nano-alumina has the physical characteristics of nano-scale size, porosity and large specific surface area, can be filled in pores to improve the mechanical property of a matrix, selectively adsorbs and contains heavy metal ions, and improves the curing effect on heavy metals. On the other hand, the nano-aluminse:Sub>A has the chemical characteristics of high activity and dissolubility in an alkaline environment, and can be used as an aluminum source to generate various hydration products such as C-A-S-H gel together with se:Sub>A calcium source provided in fly ash, the alundum tetrahedron in the structure is negatively charged, and the electric neutrality of the structure is maintained by adsorbing metal cations. The nanometer alumina is cooperated with alkali to excite and solidify heavy metal ions in the fly ash, and the heavy metal ions are solidified from two aspects of physical adsorption and chemical bonding. In addition, the curing reinforcing agent adopts an inorganic-organic composite mode to form an interpenetrating network type structure, so that the effect of curing heavy metals can be achieved, and the strength of concrete can be improved. The addition of the diethanol monoisopropanolamine in the formula can achieve the effect of exciting the activity of the fly ash, thereby enhancing the activity of the fly ash cementing material participating in hydration reaction.
Compared with the prior art, the invention has the following remarkable advantages: not only the high-efficiency resource conversion and utilization of the hazardous waste such as the waste incineration fly ash are realized; by adopting the curing reinforcing agent, the hardness of concrete can be improved, and the curing reinforcing agent has a curing effect on heavy metals; therefore, the waste incineration fly ash can be used for preparing concrete by replacing part of cement with the waste incineration fly ash according to the formula, the leaching concentration of the heavy metal in the prepared concrete is far lower than the national solid waste leaching toxicity identification standard, and the strength of the cured concrete is higher. The mode that the waste incineration fly ash replaces part of cement to manufacture concrete and is directly utilized as a building material is more economical and effective, and can meet the practical application.
Detailed Description
The present invention will be described in detail with reference to the following examples:
the cement in the embodiment and the comparative example of the invention is P.O42.5 Sanxia brand cement produced in Yicheng Hubei; the waste incineration fly ash comes from the environmental protection energy of Xiangyang Enfei; the water reducer is PC150 polycarboxylate water reducer produced by Xianyang whelk new material science and technology limited; the metakaolin is selected from Guangdong Mammy science and technology Limited, and the fineness is 200 meshes; the nanometer alumina powder is selected from Shanghai Yingsheng New materials, inc., model YC-AL200P; the diethanol monoisopropanolamine is produced by New material science and technology Limited of the sea snail of Xiangyang; the waterborne polyurethane-epoxy resin emulsion is produced by American Hansen Hexion, and has the model of 5520-w-60A; the silane coupling agent is produced in New blue sky in Hubei, model number KH-560.
The concrete experiment is carried out according to GB/T50080-2016 'common concrete mixture performance test method', the strength design grade is C30, the test temperature is 25 ℃, and the test humidity is 80%; concrete curing conditions: the temperature is 20 +/-2 ℃, and the humidity is more than or equal to 95 percent.
The concrete compressive strength is tested according to GB/T50081-2019 Standard on mechanical property test method of common concrete; the heavy metal leaching test refers to the regulation of 'solid waste leaching toxicity leaching method' (GB 5086-997), and the leaching toxicity of concrete crushed objects after 28 days of anhydrous curing is measured. Crushing the concrete test block which is cured to the end on a pressure tester, grinding the broken block to the particle size of less than 5mm, drying to the constant weight, weighing 100g, placing in a wide-mouth bottle with the volume of 2L, adding 0.8L of deionized water, placing on an oscillator, oscillating at the frequency of 110 times/minute and the amplitude of 40mm, oscillating for 8h at room temperature, standing for 16h, and finally measuring the concentration of heavy metals Cr, cu, pb, zn and Cd in the leachate by using an atomic absorption spectrophotometer.
Example 1
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: 300 parts of P.O42.5 portland cement, 50 parts of waste incineration fly ash, 900 parts of secondary graded stones, 700 parts of river sand, 40 parts of reinforcing curing agent, 7 parts of polycarboxylic acid water reducing agent, 0.3 part of sodium gluconate and 150 parts of water. The curing reinforcing agent comprises the following raw materials in parts by mass: 40 parts of metakaolin, 8 parts of nano alumina powder, 25 parts of waterborne epoxy resin-polyurethane emulsion and 3 parts of diethanol monoisopropanolamine.
The preparation method of the curing reinforcing agent comprises the following steps:
1) Adding metakaolin, nano alumina powder and diethanol monoisopropanolamine in the formula ratio into an acetone solution containing a silane coupling agent, uniformly stirring at the stirring speed of 1000r/min for 30 minutes, and then drying; the dosage of the acetone solution containing the silane coupling agent is 22 percent of the total weight of the metakaolin, the nano alumina powder and the diethanol monoisopropanolamine; in the acetone solution containing the silane coupling agent, the mass concentration of the silane coupling agent is 1.0%.
2) Putting the mixture treated in the step 1) and the polyurethane-epoxy resin emulsion with the formula amount into a high-speed dispersion machine at 2000r/min, and stirring for 30 minutes until the mixture is uniform.
The preparation method of the concrete containing the waste incineration fly ash comprises the following steps:
s1: in a concrete mixer, 300 parts of portland cement, 50 parts of waste incineration fly ash, 900 parts of secondary-graded stones, 700 parts of river sand, 40 parts of reinforcing agent and 0.3 part of sodium gluconate are added at the rotating speed of 50r/min under the normal temperature condition for stirring for 2 minutes;
s2: adding 150 parts of water and 7 parts of polycarboxylic acid water reducing agent while stirring, stirring for 3 minutes and discharging.
Example 2
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: 350 parts of P.O42.5 Portland cement, 55 parts of waste incineration fly ash, 950 parts of secondary-grade stones, 750 parts of river sand, 45 parts of reinforcing curing agent, 8 parts of polycarboxylic acid water reducing agent, 0.4 part of citric acid and 165 parts of water.
The curing reinforcing agent comprises the following raw materials in parts by mass: 45 parts of metakaolin, 9 parts of nano-alumina, 28 parts of waterborne epoxy resin-polyurethane emulsion and 4 parts of diethanol monoisopropanolamine.
The preparation method of the curing reinforcing agent comprises the following steps:
1) Adding metakaolin, nano alumina powder and diethanolisopropanolamine in formula amount into acetone solution containing silane coupling agent, stirring uniformly at the stirring speed of 1100r/min for 30 minutes, and then drying; the dosage of the acetone solution containing the silane coupling agent is 23 percent of the total weight of the metakaolin, the nano alumina powder and the diethanol monoisopropanolamine; in the acetone solution containing the silane coupling agent, the mass concentration of the silane coupling agent is 1.2%.
2) Putting the mixture treated in the step 1) and the polyurethane-epoxy resin emulsion with the formula amount into a high-speed dispersion machine 2500r/min, and stirring for 30 minutes until the mixture is uniform.
The preparation method of the concrete containing the waste incineration fly ash comprises the following steps:
s1: in a concrete mixer, at normal temperature and at a rotating speed of 50r/min, 350 parts of portland cement, 55 parts of waste incineration fly ash, 950 parts of secondary-graded stones, 750 parts of river sand, 45 parts of reinforcing curing agent and 0.4 part of citric acid are added and stirred for 2 minutes;
s2: adding 165 parts of water and 8 parts of polycarboxylic acid water reducing agent while stirring, stirring for 4 minutes and discharging.
Example 3
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: 400 parts of P.O42.5 Portland cement, 60 parts of waste incineration fly ash, 1000 parts of secondary-grade stone, 800 parts of river sand, 50 parts of reinforcing curing agent, 9 parts of polycarboxylic acid water reducing agent, 0.5 part of white sugar and 180 parts of water.
The curing reinforcing agent comprises the following raw materials in parts by mass: 50 parts of metakaolin, 9.5 parts of nano-alumina, 28 parts of waterborne epoxy resin-polyurethane emulsion and 5 parts of diethanol monoisopropanolamine.
The preparation method of the curing reinforcing agent comprises the following steps:
1) Adding metakaolin, nano alumina powder and diethanol monoisopropanolamine in the formula ratio into an acetone solution containing a silane coupling agent, uniformly stirring at the stirring speed of 1500r/min for 30 minutes, and then drying; the dosage of the acetone solution containing the silane coupling agent is 24 percent of the total weight of the metakaolin, the nano alumina powder and the diethanol monoisopropanolamine; in the acetone solution containing the silane coupling agent, the mass concentration of the silane coupling agent is 1.5%.
2) Putting the mixture treated in the step 1) and the polyurethane-epoxy resin emulsion with the formula amount into a high-speed dispersion machine 2500r/min, and stirring for 30 minutes until the mixture is uniform.
The preparation method of the concrete containing the waste incineration fly ash comprises the following steps:
s1: in a concrete mixer, at normal temperature and at a rotating speed of 50r/min, 400 parts of portland cement, 60 parts of waste incineration fly ash, 1000 parts of secondary-graded stones, 800 parts of river sand, 50 parts of reinforcing agent and 0.5 part of white sugar are added and stirred for 2 minutes;
s2: adding 180 parts of water and 9 parts of polycarboxylic acid water reducing agent while stirring, stirring for 3 minutes and discharging.
Comparative example 1
The concrete comprises the following raw materials in parts by weight: 350 parts of P.O42.5 portland cement, 900 parts of secondary graded stones, 700 parts of river sand, 7 parts of polycarboxylic acid water reducing agent, 0.3 part of sodium gluconate and 150 parts of water.
The preparation method of the concrete comprises the following steps:
s1, adding 300 parts of portland cement, 900 parts of broken stone, 700 parts of river sand and 0.3 part of sodium gluconate into a concrete mixer at normal temperature and at a rotating speed of 50r/min for stirring for 2 minutes;
and S2, adding 150 parts of water and 7 parts of polycarboxylic acid water reducing agent while stirring, stirring for 3 minutes, and discharging.
The cement in this comparative example was 350 parts by weight as compared with example 1, and the waste incineration fly ash and the curing enhancer were not added, and the other examples were the same as example 1.
Comparative example 2
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: 300 parts of P.O42.5 portland cement, 50 parts of waste incineration fly ash, 900 parts of secondary graded stones, 700 parts of river sand, 7 parts of polycarboxylic acid water reducing agent, 0.3 part of sodium gluconate and 150 parts of water.
The preparation method of the concrete containing the waste incineration fly ash comprises the following steps:
s1, adding 300 parts of portland cement, 50 parts of waste incineration fly ash, 900 parts of broken stone, 700 parts of river sand and 0.3 part of sodium gluconate into a concrete mixer at normal temperature and at a rotating speed of 50r/min for stirring for 2 minutes;
and S2, adding 150 parts of water and 7 parts of polycarboxylic acid water reducing agent while stirring, stirring for 3 minutes, and discharging.
In comparison with example 1, this comparative example does not include a reinforcing agent, and is otherwise the same as example 1.
Comparative example 3
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: the same as in example 1, except that: in comparison with example 1, the reinforcing curative component of this comparative example was the same as example 1 except that metakaolin was not added.
Comparative example 4
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: the same as in example 1, except that: in comparison with example 1, the reinforcing curing agent component of this comparative example does not contain nano alumina powder, and the other is the same as example 1.
Comparative example 5
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: the same as in example 1, except that: in contrast to example 1, the reinforcing curing agent component of this comparative example was the same as example 1 except that no aqueous epoxy resin-polyurethane emulsion was added.
Comparative example 6
The concrete containing the waste incineration fly ash comprises the following raw materials in parts by weight: the same as in example 1, except that: in contrast to example 1, the reinforcing curative component of this comparative example was the same as example 1 except that no diethanolisopropanolamine was added.
The concrete prepared in examples 1 and 3 and comparative examples 1 and 6 were tested, and table 1 shows the compressive strength (MPa), and table 2 shows the heavy metal leaching concentration mg/L of crushed concrete 28 d.
TABLE 1 compression Strength values (MPa) of concrete for examples and comparative examples
TABLE 2 examples and comparative examples concrete 28d crushed material heavy metal leaching concentration (mg/L)
| Numbering | Pb 2+ | Cd 2+ | Zn 2+ | Cu 2+ | Total Cr |
| Example 1 | 0.25 | 0.08 | 17.10 | 18.05 | 0.78 |
| Example 2 | 0.23 | 0.07 | 16.85 | 17.90 | 0.69 |
| Example 3 | 0.20 | 0.08 | 17.05 | 17.85 | 0.71 |
| Comparative example 2 | 2.82 | 0.35 | 49.52 | 48.78 | 1.58 |
| Comparative example 3 | 2.54 | 0.28 | 35.75 | 34.80 | 1.48 |
| Comparative example 4 | 0.52 | 0.19 | 21.80 | 20.57 | 1.12 |
| Comparative example 5 | 0.85 | 0.18 | 23.58 | 22.78 | 0.96 |
| Comparative example 6 | 0.35 | 0.28 | 20.48 | 19.88 | 1.02 |
Remarking: the highest allowable concentration of heavy metal ions in solid waste leachate in China is as follows: pb 2+ 3mg/L，Cd 2+ 0.3mg/L，Zn 2+ 50mg/L，Cu 2+ 50mg/L of total Cr 1.5mg/L
As can be seen from Table 1, the compressive strength of the concrete of example 1 is slightly higher than that of comparative example 1 without adding the waste incineration fly ash, and the cement content of example 1 is 300 parts less than 350 parts in comparative example 1, which shows that the waste incineration fly ash can replace part of the cement and has no negative effect on the concrete strength. As can be seen from Table 2, the heavy metal concentrations of the leachate of the crushed concrete 28d in the examples 1 to 3 are all smaller than those of the leachate in the comparative examples 2 to 6, and are far lower than the maximum allowable concentration of the leachate specified in China, so that the leachate can be safely used. Comparing example 1 with comparative examples 2-6, when no curing enhancer is added or the curing enhancer is added, but one component in the curing enhancer is reduced, the strength of the concrete is reduced, and the heavy metal leaching resistance is poor, which shows that the metakaolin, the nano powder, the organic resin emulsion and the alcohol amine in the curing enhancer have synergistic effect and can only play a role when the components exist at the same time, and the property of one component is obviously reduced if the components are lacked.
The above detailed description of a concrete containing fly ash from incineration of refuse and a method for preparing the same with reference to examples is illustrative and not restrictive, and several examples can be cited within the scope of the present invention, so that variations and modifications thereof without departing from the general inventive concept can be made within the scope of the present invention.
Claims (10)
1. The concrete containing the waste incineration fly ash is characterized by comprising the following raw materials in parts by weight: 300-400 parts of cement, 50-60 parts of waste incineration fly ash, 900-1000 parts of coarse aggregate, 700-800 parts of fine aggregate, 40-50 parts of curing reinforcing agent, 150-180 parts of water, 0.3-0.5 part of retarder and 7-9 parts of water reducing agent.
2. The concrete containing waste incineration fly ash according to claim 1, wherein the curing enhancer comprises the following raw materials in parts by mass: 40-50 parts of metakaolin, 8-10 parts of nano alumina powder, 25-30 parts of waterborne epoxy resin-polyurethane emulsion and 3-5 parts of diethanol monoisopropanolamine.
3. The concrete containing fly ash from waste incineration according to claim 1 or 2, wherein the method for preparing the curing enhancer comprises the following steps:
1) Adding metakaolin, nano alumina powder and diethanol monoisopropanolamine in a formula ratio into an acetone solution containing a silane coupling agent, uniformly stirring, and then drying;
2) Putting the mixture treated in the step 1) and the polyurethane-epoxy resin emulsion with the formula amount into a high-speed dispersion machine, and stirring the mixture and the polyurethane-epoxy resin emulsion until the mixture is uniform.
4. The concrete containing fly ash from waste incineration as claimed in claim 3, wherein the amount of the acetone solution containing the silane coupling agent is 20-25% of the total weight of the metakaolin, the nano alumina powder and the diethanol monoisopropanolamine.
5. The concrete containing fly ash from waste incineration according to claim 3 or 4, wherein the mass concentration of the silane coupling agent in the acetone solution containing the silane coupling agent is 1.0 to 1.5%.
6. The concrete containing fly ash from waste incineration according to claim 3 or 4, wherein the stirring speed in step 1) is 1000 to 1200r/min, respectively.
7. The concrete containing fly ash from waste incineration according to claim 3 or 4, wherein the stirring speed in step 2) is: 2000-3000r/min.
8. The concrete containing waste incineration fly ash according to claim 1, wherein the cement is any one or more of portland cement, aluminate cement, or sulphoaluminate cement.
9. The concrete containing fly ash from refuse incineration of claim 1, wherein the coarse aggregate is a stone of a secondary composition, wherein the stone of 5mm to 10mm accounts for 40% and the stone of 10mm to 20mm accounts for 60%.
10. A method for preparing the concrete containing fly ash from incineration of refuse according to any one of claims 1 to 9, wherein the method comprises: adding the cement, the waste incineration fly ash, the coarse aggregate, the fine aggregate, the curing reinforcing agent and the retarder which are in the formula ratio into a concrete mixer for premixing; and adding water and a water reducing agent according to the formula amount while stirring, mixing, uniformly stirring and discharging.
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| CN115108766A (en) * | 2022-07-13 | 2022-09-27 | 国发环保新材料(江门)有限公司 | Artificial stone manufactured by using construction waste and fly ash of power plant and process |
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