CN115745505B - Ecological early-strength impervious dry-mixed mortar and preparation method thereof - Google Patents
Ecological early-strength impervious dry-mixed mortar and preparation method thereof Download PDFInfo
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The ecological early-strength impervious dry-mixed mortar comprises, by weight, 390-408 parts of cement, 42-48 parts of reclaimed brick powder, 20-24 parts of bamboo She Hui, 12-14 parts of modified soy sauce residues, 4.5-7.4 parts of a water reducer and 215-250 parts of water, wherein fine aggregate comprises 494-619 parts of lithium tailings and 618-743 parts of machine-made sand. And provides a preparation method of the ecological early-strength impervious dry-mixed mortar. The invention provides ecological early-strength impervious dry-mixed mortar with ecological environment protection and high economic benefit and a preparation method thereof.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to ecological early-strength dry-mixed mortar and a preparation method thereof.
Background
In recent years, the development of dry-mixed mortar in China is rapid, the annual yield of dry-mixed mortar in 2019 is over 1 hundred million tons, and the annual trend is increasing. The dry-mixed mortar has the advantages of stable quality, convenient use, mass production and the like, but for severe construction environments such as winter construction, the dry-mixed mortar with better quality is still lacking at present. In winter construction, the low temperature can lead to slow hydration and prolonged setting time of cement, thereby reducing the early mechanical property and impermeability of mortar, which can obviously influence the progress and quality of winter construction.
The proportion of the waste concrete and the waste bricks in the existing construction waste is extremely large, wherein the waste bricks can be subjected to regeneration treatment methods such as drying, crushing, grinding and the like to obtain regenerated brick powder, and a proper amount of regenerated brick powder can effectively reduce the shrinkage of mortar, reduce the setting time of the mortar and improve the mechanical property of the mortar. In addition, the research discovers that part of agricultural solid waste has volcanic ash activity after being calcined, such as rice hull ash, straw ash, waste tea ash and the like, which belong to biomass ash with higher activity. The invention recovers the bamboo leaf wasteHigh temperature treatment to obtain bamboo She Hui with pozzolanic activity, which can be combined with Ca (OH) in hydration phase 2 The reaction generates additional C-S-H gel, thereby improving the compactness of the mortar. The soy sauce residues are byproducts of soy sauce brewing industry, and can not be directly used as feed for feeding poultry due to the fact that the soy sauce residues contain high salt, the problems that the salt content of a stacking place exceeds the standard and the like can be caused by random stacking, and the early strength development of the mortar can be promoted by mixing the soy sauce residues into the mortar after calcining the soy sauce residues into the soy sauce residue ash at high temperature, so that the problem of comprehensive utilization of the soy sauce residues can be solved. The yield of the tailings accounts for about 30% of the total solid waste in a large amount of industry, and the comprehensive utilization rate of the metal tailings is less than 10% on average, so that the improvement of the solid waste recycling utilization rate of the metal tailings is urgent. The lithium tailings are mine wastes which have low lithium content and are difficult to extract after the lithium ores are beneficiated, the main component of the lithium tailings is spodumene, the lithium tailings can replace fine aggregate in a large amount to improve the compressive strength of mortar, and the problems of occupation of the lithium tailings, land pollution and the like are effectively solved.
In the prior art, the dry-mixed mortar improves the early strength and the impermeability by adding the additive, but sometimes the expected aim can not be achieved, and the additive has higher cost and low economic benefit.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides ecological early-strength impervious dry-mixed mortar with ecological environment protection and high economic benefit and a preparation method thereof.
The technical scheme adopted for solving the technical problems is as follows:
the ecological early-strength impervious dry-mixed mortar comprises the following components in parts by weight,
390-408 parts of cement, 42-48 parts of recycled brick powder, 20-24 parts of bamboo She Hui, 494-619 parts of lithium tailings and 618-743 parts of machine-made sand as fine aggregate, 12-14 parts of modified soy sauce residues, 4.5-7.4 parts of water reducer and 215-250 parts of water.
Further, the cement is P.O42.5 cement; the fine aggregate is a region II of particle size grading, wherein the fine aggregate is prepared by mixing lithium tailings with different particle sizes and machine-made sand, and the fineness modulus is 2.4-3.0; the water reducing agent is polycarboxylate water reducing agent powder, and the water reducing efficiency is 25%.
Still further, providedThe specific surface area of the regenerated brick powder is more than or equal to 450m 2 The activity index of the catalyst per kg and 28d is more than or equal to 70 percent, siO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 85%; the surface area of the bamboo She Huibi is more than or equal to 550m 2 The activity index of the catalyst per kg and 28d is more than or equal to 90 percent, siO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 80%; the Mohs hardness of the lithium tailings is 6.5-7, and the components comprise spodumene, albite, quartz and muscovite, and SiO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 85%.
Further, the modified soy sauce residue is soy sauce residue ash obtained by calcining and grinding soy sauce residue, and the specific surface area is more than or equal to 650m 2 /kg。
The preparation method of the ecological early-strength impervious dry-mixed mortar comprises the following steps:
(1) Weighing corresponding raw materials in parts by weight, wherein the raw materials comprise the following components in parts by weight: 390-408 parts of cement, 42-48 parts of recycled brick powder, 20-24 parts of bamboo She Hui, 494-619 parts of fine aggregate of lithium tailings and 618-743 parts of machine-made sand, 12-14 parts of modified soy sauce residues, 4.5-7.4 parts of water reducer and 215-250 parts of water;
(2) Pouring cement, regenerated brick powder, bamboo She Hui, lithium tailings, machine-made sand, modified soy sauce residues and a powder polycarboxylate water reducer into a stirrer, slowly stirring for 20-40 s, and rapidly stirring for 20-40 s to fully mix the materials;
(3) Pouring the mixed water into a stirrer slowly and uniformly, and stirring for 80-100 s to obtain the finished product.
Further, in the step (1), the modified soy sauce residue is soy sauce residue ash obtained by calcining and grinding soy sauce residue, and the specific surface area of the modified soy sauce residue ash is more than or equal to 650m 2 /kg。
Preferably, the preparation process of the modified soy sauce comprises the following steps:
(1.1) drying soy sauce residues at a constant temperature of 50 ℃ to obtain soy sauce residue particles, and drying, primary grinding and secondary drying to obtain soy sauce residue small particles;
(1.2) screening the dried soy sauce residue particles by a sieving machine to obtain particles with the particle size less than or equal to 0.15 mm;
(1.3) placing the soy sauce residue small particles into a high-temperature resistance furnace, heating to 300 ℃ at a speed of 20 ℃/min, keeping the temperature for 1h, introducing air at a constant speed during the period, heating to 600 ℃ at the same heating speed, calcining for 2h at the temperature of 600 ℃, and naturally cooling to obtain soy sauce residue ash;
(1.4) grinding the soy sauce residue ash for the second time until the grain diameter is less than or equal to 15 mu m, and taking out for standby.
The invention uses the regenerated brick powder and the bamboo She Hui to replace cement, and the surface area of the regenerated brick powder and the bamboo She Huibi is larger than that of the cement, so that the pores of the mortar matrix can be effectively filled. In addition, the 28d activity indexes of the regenerated brick powder and the bamboo She Hui are more than or equal to 85 percent, and the regenerated brick powder and the bamboo She Hui can be matched with Ca (OH) in a hydration phase 2 The reaction is carried out to generate additional C-S-H gel, so that the compactness of the mortar is further improved, and the effects are helpful for improving the early strength and the impermeability of the mortar. In addition, the recycled brick powder can accelerate the early hydration process of cement, thereby shortening the setting time of mortar, which is helpful for improving the early strength and the shrinkage resistance of the mortar. The lithium tailings are used for replacing machine-made sand, the main component of the lithium tailings is spodumene, the hardness of the lithium tailings is slightly higher than that of common machine-made sand, and the lithium tailings are beneficial to the compressive strength of mortar. NaCl in the modified soy sauce residue component can reduce the freezing point of free water in the mortar and reduce the frost heaving risk of the mortar. In addition, the chloride salts can react to generate hydrated calcium chloroaluminate (AFm) to strengthen the early strength of the mortar.
In the invention, the regenerated brick powder, the bamboo She Hui, the lithium tailings and the modified soy sauce residues are mixed into the mortar to obtain the early-strength impervious dry-mixed mortar, and the mortar prepared by the invention has the advantages of ecology, environmental protection and high economic benefit for reasonable utilization of solid waste. The method provides a choice for the preparation method of the early-strength impervious dry-mixed mortar, more effectively relieves the problems of environmental pollution and the like caused by various solid wastes, protects the environment and reduces the waste and consumption of resources at the same time.
The beneficial effects of the invention are mainly shown in the following steps:
1. the regenerated brick powder, the bamboo She Hui, the lithium tailings and the modified soy sauce residues are fully regenerated and utilized in the invention. The high volcanic ash activity of the regenerated brick powder and the bamboo leaf ash is fully exerted, and the early strength of the mortar is improved. The addition of the lithium tailings can improve the grain composition of the fine aggregate, effectively improve the compactness of the mortar and enhance the mechanical property and the impermeability of the mortar. The direct stacking or burying of the four solid wastes can have negative effects on the ecological environment, and the mixed mortar is beneficial to improving the mortar performance and the resource utilization rate.
2. The NaCl content in the modified soy sauce residue is considerable. The invention adopts the method of high-temperature calcination and multiple grinding to modify the soy sauce residues, and utilizes NaCl in the components to promote the early strength development of the mortar. In addition, in winter construction, the existence of the soy sauce residues also helps to lower the free water freezing point and lower the frost heaving risk of the mortar.
Drawings
FIG. 1 is a flow chart of a method for preparing ecological early strength anti-seepage dry-mixed mortar.
Fig. 2 is a flow chart of a preparation process of the modified soy sauce.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, an ecological early-strength impervious dry-mixed mortar comprises the following components in parts by weight,
390-408 parts of cement, 42-48 parts of recycled brick powder, 20-24 parts of bamboo She Hui, 494-619 parts of lithium tailings and 618-743 parts of machine-made sand as fine aggregate, 12-14 parts of modified soy sauce residues, 4.5-7.4 parts of water reducer and 215-250 parts of water.
The formulation of this example is:
391 parts of cement, 42 parts of recycled brick powder, 20 parts of bamboo leaf ash, 742 parts of fine aggregate which is lithium tailings 495 and machine-made sand, 12 parts of modified soy sauce residues, 4.6 parts of water reducer and 249 parts of water.
Or is: 400 parts of cement, 45 parts of recycled brick powder, she Hui parts of bamboo, 557 parts of fine aggregate, 680 parts of machine-made sand, 13 parts of modified soy sauce residues, 6.1 parts of water reducer and 234 parts of water.
Or still further: 408 parts of cement, 48 parts of recycled brick powder, 24 parts of bamboo leaf ash, 619 parts of fine aggregate, 14 parts of modified soy sauce residues, 7.2 parts of water reducer and 216 parts of water.
Or alternatively: 390 parts of cement, 46 parts of recycled brick powder, 23 parts of bamboo leaf ash, 494 parts of fine aggregate, 618 parts of machine-made sand, 12.5 parts of modified soy sauce residues, 4.5 parts of water reducer and 215 parts of water.
Yet alternatively is: or alternatively: 390 parts of cement, 46 parts of recycled brick powder, 23 parts of bamboo leaf ash, 494 parts of fine aggregate, 743 parts of machine-made sand, 12.5 parts of modified soy sauce residues, 7.4 parts of water reducer and 250 parts of water.
In this embodiment, the cement is p.o42.5 cement; the fine aggregate is a region II of particle grading, wherein the fine aggregate is prepared by mixing lithium tailings with different particle diameters and machine-made sand, and the fineness modulus is 2.4-3.0; the water reducing agent is polycarboxylate water reducing agent powder, and the water reducing efficiency is 25%.
Further, the specific surface area of the regenerated brick powder is more than or equal to 450m 2 The activity index of the catalyst per kg and 28d is more than or equal to 70 percent, siO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 85%; the surface area of the bamboo She Huibi is more than or equal to 550m 2 The activity index of the catalyst per kg and 28d is more than or equal to 90 percent, siO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 80%; the Mohs hardness of the lithium tailings is 6.5-7, and the main components are spodumene, albite, quartz and muscovite, and SiO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 85%.
Still further, the modified soy sauce residue is soy sauce residue ash obtained by calcining soy sauce residue at high temperature, and the specific surface area is more than or equal to 650m 2 /kg。
The preparation method of the ecological early-strength impervious dry-mixed mortar comprises the following steps:
(1) Weighing corresponding raw materials in parts by weight, wherein the raw materials comprise the following components in parts by weight: 390-408 parts of cement, 42-48 parts of recycled brick powder, 20-24 parts of bamboo She Hui, 494-619 parts of fine aggregate of lithium tailings and 618-743 parts of machine-made sand, 12-14 parts of modified soy sauce residues, 4.5-7.4 parts of water reducer and 215-250 parts of water;
(2) Pouring cement, regenerated brick powder, bamboo She Hui, lithium tailings, machine-made sand, modified soy sauce residues and a powder polycarboxylate water reducer into a stirrer, slowly stirring for 20-40 s, and rapidly stirring for 20-40 s to fully mix the materials;
(3) Pouring the mixed water into a stirrer slowly and uniformly, and stirring for 80-100 s to obtain the finished product.
Further, in the step (1), the modified soy sauce residue is soy sauce residue ash obtained by calcining and grinding soy sauce residue, and the specific surface area of the modified soy sauce residue ash is more than or equal to 650m 2 /kg。
Preferably, the preparation process of the modified soy sauce comprises the following steps:
(1.1) drying soy sauce residues at a constant temperature of 50 ℃ to obtain soy sauce residue particles, and drying, primary grinding and secondary drying to obtain soy sauce residue small particles;
(1.2) screening the dried soy sauce residue particles by a sieving machine to obtain particles with the particle size less than or equal to 0.15 mm;
(1.3) placing the soy sauce residue small particles into a high-temperature resistance furnace, heating to 300 ℃ at a speed of 20 ℃/min, keeping the temperature for 1h, introducing air at a constant speed during the period, heating to 600 ℃ at the same heating speed, calcining for 2h at the temperature of 600 ℃, and naturally cooling to obtain soy sauce residue ash;
(1.4) grinding the soy sauce residue ash for the second time until the grain diameter is less than or equal to 15 mu m, and taking out for standby.
In this example, the amounts of the different components were adjusted to give comparative examples and examples 1 to 3. The mortar three-dimensional compressive strength test method is carried out by referring to (JGJ/T70-2009) building mortar basic performance test method standard. To simulate winter construction and maintenance scenes, the mortar test blocks of comparative examples and examples 1-3 were placed in a maintenance box at a temperature of (5.+ -. 2) ℃ and a temperature of (20.+ -. 2) ℃ and a relative humidity of 90% or more, respectively, and were cured, and the compressive strengths of the mortar test blocks at the ages of 3d, 7d and 28d were measured. The test method of the anti-permeability performance of the mortar is carried out by referring to (JGJ/T70-2009) building mortar basic performance test method standard, and the test results are shown in tables 1 and 2. The mortar compressive strength test used was a cubic block of 70.7mm.times.70.7mm.times.70.7 mm.
Comparative example:
the ecological early-strength dry-mixed mortar comprises the following components in parts by weight, 467 parts of cement, 1237 parts of machine-made sand, 6.1 parts of water reducer and 234 parts of water. The water-gel ratio was 0.50.
Example 1:
the ecological early-strength dry-mixed mortar comprises, by weight, 391 parts of cement, 42 parts of reclaimed brick powder, 20 parts of bamboo leaf ash, 495 parts of lithium tailings, 742 parts of machine-made sand, 12 parts of modified soy sauce residues, 4.6 parts of a water reducer and 249 parts of water. The water-gel ratio was 0.55.
Example 2:
the ecological early-strength dry-mixed mortar comprises, by weight, 400 parts of cement, 45 parts of reclaimed brick powder, she Hui parts of bamboo, 557 parts of lithium tailings, 680 parts of machine-made sand, 13 parts of modified soy sauce residues, 6.1 parts of a water reducer and 234 parts of water. The water-gel ratio was 0.50.
Example 3:
the ecological early-strength dry-mixed mortar comprises, by weight, 408 parts of cement, 48 parts of recycled brick powder, 24 parts of bamboo leaf ash, 619 parts of lithium tailings, 619 parts of machine-made sand, 14 parts of modified soy sauce residues, 7.2 parts of a water reducer and 216 parts of water. The water-gel ratio was 0.45.
Table 1 shows the compressive strengths (MPa) at different ages for comparative examples and examples 1-3.
TABLE 1
Table 2 shows osmotic pressure (MPa) at various ages for comparative and examples 1-3.
TABLE 2
As can be seen from comparing the results of comparative examples and examples 1-3, the dry-mixed mortar prepared by the method can better adapt to the winter construction environment, and compared with the traditional dry-mixed mortar, the early strength and the impermeability of the mortar prepared by the method are obviously improved.
The embodiments described in this specification are merely illustrative of the manner in which the inventive concepts may be implemented. The scope of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but the scope of the present invention and the equivalents thereof as would occur to one skilled in the art based on the inventive concept.
Claims (6)
1. The ecological early-strength impervious dry-mixed mortar is characterized by comprising the following components in parts by weight,
390-408 parts of cement, 42-48 parts of recycled brick powder, 20-24 parts of bamboo She Hui, 494-619 parts of fine aggregate of lithium tailings and 618-743 parts of machine-made sand, 12-14 parts of modified soy sauce residues, 4.5-7.4 parts of water reducer and 215-250 parts of water;
the preparation process of the modified soy sauce comprises the following steps:
(1.1) drying soy sauce residues at a constant temperature of 50 ℃ to obtain soy sauce residue particles, and drying, primary grinding and secondary drying to obtain soy sauce residue small particles;
(1.2) screening the dried soy sauce residue particles by a sieving machine to obtain particles with the particle size less than or equal to 0.15 mm;
(1.3) placing the soy sauce residue small particles into a high-temperature resistance furnace, heating to 300 ℃ at a speed of 20 ℃/min, keeping the temperature for 1h, introducing air at a constant speed during the period, heating to 600 ℃ at the same heating speed, calcining for 2h at the temperature of 600 ℃, and naturally cooling to obtain soy sauce residue ash;
(1.4) grinding the soy sauce residue ash for the second time until the grain diameter is less than or equal to 15 mu m, and taking out for standby.
2. The ecological early-strength impervious dry-mixed mortar according to claim 1, wherein the cement is P.O42.5 cement; the fine aggregate is a region II of particle size grading, wherein the fine aggregate is prepared by mixing lithium tailings with different particle sizes and machine-made sand, and the fineness modulus is 2.4-3.0; the water reducing agent is polycarboxylate water reducing agent powder, and the water reducing efficiency is 25%.
3. A method as claimed in claim 1 or 2The ecological early-strength impervious dry-mixed mortar is characterized in that the specific surface area of the regenerated brick powder is more than or equal to 450m 2 The activity index of the catalyst per kg and 28d is more than or equal to 70 percent, siO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 85%; the surface area of the bamboo She Huibi is more than or equal to 550m 2 The activity index of the catalyst per kg and 28d is more than or equal to 90 percent, siO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 80%; the Mohs hardness of the lithium tailings is 6.5-7, and the components comprise spodumene, albite, quartz and muscovite, and SiO 2 +Al 2 O 3 +Fe 2 O 3 The total amount exceeds 85%.
4. The ecological early-strength impervious dry-mixed mortar as claimed in claim 1 or 2, wherein the modified soy sauce residue is soy sauce residue ash obtained by calcining and grinding soy sauce residue, and the specific surface area is more than or equal to 650m 2 /kg。
5. A method for preparing the ecological early-strength anti-seepage dry-mixed mortar according to claim 1, which comprises the following steps:
(1) Weighing corresponding raw materials in parts by weight, wherein the raw materials comprise the following components in parts by weight: 390-408 parts of cement, 42-48 parts of recycled brick powder, 20-24 parts of bamboo She Hui, 494-619 parts of fine aggregate of lithium tailings and 618-743 parts of machine-made sand, 12-14 parts of modified soy sauce residues, 4.5-7.4 parts of water reducer and 215-250 parts of water;
(2) Pouring cement, regenerated brick powder, bamboo She Hui, lithium tailings, machine-made sand, modified soy sauce residues and a powder polycarboxylate water reducer into a stirrer, slowly stirring for 20-40 s, and rapidly stirring for 20-40 s to fully mix the materials;
(3) Pouring the mixed water into a stirrer slowly and uniformly, and stirring for 80-100 s to obtain a finished product;
the preparation process of the modified soy sauce comprises the following steps:
(1.1) drying soy sauce residues at a constant temperature of 50 ℃ to obtain soy sauce residue particles, and drying, primary grinding and secondary drying to obtain soy sauce residue small particles;
(1.2) screening the dried soy sauce residue particles by a sieving machine to obtain particles with the particle size less than or equal to 0.15 mm;
(1.3) placing the soy sauce residue small particles into a high-temperature resistance furnace, heating to 300 ℃ at a speed of 20 ℃/min, keeping the temperature for 1h, introducing air at a constant speed during the period, heating to 600 ℃ at the same heating speed, calcining for 2h at the temperature of 600 ℃, and naturally cooling to obtain soy sauce residue ash;
(1.4) grinding the soy sauce residue ash for the second time until the grain diameter is less than or equal to 15 mu m, and taking out for standby.
6. The process according to claim 5, wherein in the step (1), the modified soy sauce residue is a soy sauce residue ash obtained by calcining-grinding a soy sauce residue, and the specific surface area is not less than 650m 2 /kg。
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