CN111848034A - Wet-mixed mortar and preparation process thereof - Google Patents

Wet-mixed mortar and preparation process thereof Download PDF

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Publication number
CN111848034A
CN111848034A CN202010684866.4A CN202010684866A CN111848034A CN 111848034 A CN111848034 A CN 111848034A CN 202010684866 A CN202010684866 A CN 202010684866A CN 111848034 A CN111848034 A CN 111848034A
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China
Prior art keywords
wet
mixed mortar
parts
water
performance
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CN202010684866.4A
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Chinese (zh)
Inventor
李从波
杨斯豪
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Guangzhou University
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Guangzhou University
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Priority to CN202010684866.4A priority Critical patent/CN111848034A/en
Publication of CN111848034A publication Critical patent/CN111848034A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02Treatment
    • C04B20/023Chemical treatment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The embodiment of the invention provides wet-mixed mortar and a preparation process thereof, the wet-mixed mortar takes alkaline residues as preparation raw materials, can consume solid wastes generated in the alkali making industry, solves the problem that the alkaline residues cannot be effectively treated for a long time, takes the modified alkaline residues as admixture, not only solves the problems of stacking and pollution of the solid wastes in an alkali making plant, but also improves the performance of the wet-mixed mortar and reduces the production cost of the wet-mixed mortar. The solid waste alkali residues are used as a base, the polycarboxylic acid high-performance dispersing agent and the anhydrous sodium carbonate are added for composite modification, and when the polycarboxylic acid high-performance dispersing agent and the anhydrous sodium carbonate are doped into the wet-mixed mortar for use, the polycarboxylic acid high-performance dispersing agent has improved strength and good water retention performance, and is the wet-mixed mortar for the building with excellent construction performance and mechanical performance.

Description

Wet-mixed mortar and preparation process thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to wet-mixed mortar and a preparation process thereof.
Background
Sodium carbonate is widely applied to industries such as metallurgy, building materials, papermaking, medicine, chemical industry, food and the like as an important basic chemical raw material. Due to the characteristics of the ammonia-soda process soda ash production process, about 0.3 ton of caustic sludge needs to be discharged outwards when 1 ton of soda ash is produced, and about 24 million tons of waste sludge are discharged every year in a factory producing 80 million tons of soda ash every year. At present, the annual output of soda ash all over the world is about 3000 million tons, wherein the annual output of soda ash produced by an ammonia-soda process is about 2000 million tons, and the annual production of caustic sludge is about 2000 million cubic meters. If the alkaline residue is not reasonably treated and utilized for a long time, the alkaline residue occupies land, pollutes the environment and destroys ecological balance.
The main chemical component of the alkaline residue comprises CaCO3、Ca(OH)2、CaSO4、CaCl2And the air layer is formed when the air is piled in the open air all the year round, and dust is easy to generate. The dust and the waste residue can not only cause serious harm to the surrounding residential areas and urban environment, but also cause environmental pollution to the water body of rivers and the water quality of offshore areas, and can block a navigation channel. Untreated caustic sludge has high water content and poor stability, and is easy to collapse when encountering shock caustic sludge. The pH value of the alkaline residue is generally 9 to 12, the alkaline residue belongs to a high-alkalinity substance, and the alkaline residue is randomly stacked, so that harmful ingredients in the alkaline residue are easy to permeate into underground water and soil through weathering leaching and surface runoff erosion, water is polluted, microorganisms in the soil are killed, the soil loses the decomposition capability, and the original structure is damaged to form the saline-alkali soil.
In the prior art, in order to eliminate the harm of alkali-making waste residues, one method is to dry the alkali residues and add the dried alkali residues into portland cement to produce concrete or mortar, however, the alkali residues contain a large amount of chloride ions and sulfate ions, so that reinforcing steel bars can be corroded, and a series of engineering quality problems such as concrete expansion are caused. The other method is to produce the beta-hemihydrate gypsum for construction by using the alkali slag, but the method has high production cost and low utilization value. The other method is to use the caustic sludge to produce cement clinker and fertilizer. The methods all have a series of problems of secondary pollution, high energy consumption, unstable product quality and the like, and cannot realize large-scale industrial production, so that an effective alkaline residue treatment method is not available at present, and the resource utilization of the alkaline residue is still a problem which needs to be solved urgently at present.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. The wet-mixed mortar provided by the invention takes the alkaline residue as a preparation raw material, realizes resource utilization of the alkaline residue, and has excellent construction performance.
According to the embodiment of the first aspect of the invention, the wet-mixed mortar comprises the following preparation raw materials in parts by weight:
modified alkaline residue: 5 to 90 parts of a solvent, and a solvent,
cement: 180-210 parts of (A) to (B),
river sand: 1250 to 1300 parts of (a) of,
limestone powder: 5 to 90 parts of a solvent, and a solvent,
water reducing agent: 2 to 3 parts of (A) a water-soluble polymer,
water: 210-240 parts.
According to the embodiment of the first aspect of the invention, the wet-mixed mortar has at least the following technical effects:
the wet-mixed mortar provided by the embodiment of the invention takes the alkaline residue as a preparation raw material, can consume solid wastes generated in the alkali making industry, solves the problem that the alkaline residue cannot be effectively treated for a long time, and takes the modified alkaline residue as an admixture, thereby not only solving the problems of stacking and pollution of the solid wastes in an alkali making plant, but also improving the performance of the wet-mixed mortar and reducing the production cost of the wet-mixed mortar.
According to the wet-mixed mortar disclosed by the embodiment of the invention, the solid waste alkali residues are used as a base, the polycarboxylic acid high-performance dispersing agent and the anhydrous sodium carbonate are added for composite modification, and when the polycarboxylic acid high-performance dispersing agent and the anhydrous sodium carbonate are doped into the wet-mixed mortar for use, the polycarboxylic acid high-performance dispersing agent has improved strength and good water retention performance, and is the wet-mixed mortar for the building with excellent construction performance and mechanical performance.
According to the wet-mixed mortar disclosed by the embodiment of the invention, the dispersant is added to realize effective dispersion, so that waste residues can be better dispersed in a wet-mixed mortar system, and the prepared wet-mixed mortar has better material performance. The alkaline residue is used as the admixture, so that the production cost of the wet-mixed mortar can be well reduced, and the recycling of waste is facilitated.
According to some embodiments of the invention, the modified caustic sludge has a water content of 40-50%.
According to some embodiments of the invention, the modified caustic sludge is prepared by: and adding anhydrous sodium carbonate and water into the alkaline residue, stirring for reaction, and performing suction filtration to obtain the sodium bicarbonate.
According to some embodiments of the invention, the mass ratio of the anhydrous sodium carbonate, the water and the caustic sludge is (11-18): (250-300): (200-220).
According to some embodiments of the invention, the stirring reaction time is 0.5-1 h.
According to some embodiments of the invention, the cement is PO52.5 portland cement.
According to some embodiments of the invention, the water reducer is a polycarboxylate water reducer comprising PC-50, LDS-850 and LDS-10N.
According to the second aspect of the invention, the preparation process of the wet-mixed mortar comprises the following steps:
S1: weighing the preparation raw materials according to the proportion, adding part of the water reducing agent and water into the modified alkaline residue, and uniformly mixing to obtain an alkaline residue solution;
s2: uniformly mixing cement, river sand and limestone powder to obtain a solid mixture;
s3: uniformly mixing the caustic sludge solution obtained in the step S1 with the solid mixture obtained in the step S2 to obtain a cementing material;
s4: and (5) adding the residual water reducing agent into the cementing material obtained in the step S3, uniformly mixing, pouring the slurry into a mold, demolding after primary curing at normal temperature, and continuing secondary curing to obtain the wet-mixed mortar.
The partial water reducing agent in the step S1 is PC-50, and the remaining water reducing agents in the step S4 are LDS-10N and LDS-850.
The preparation process of the wet-mixed mortar according to the embodiment of the second aspect of the invention has at least the following technical effects:
the preparation process of the wet-mixed mortar provided by the embodiment of the invention has simple steps, and the process directly applies the wet-shaped modified waste residues to the wet-mixed mortar, so that the secondary energy consumption for drying the waste residues is reduced.
The preparation process of the wet-mixed mortar provided by the embodiment of the invention provides obvious advantages for improving the construction efficiency and reducing pollution on a construction site, has simple requirements on a storage site, and only needs a simple mortar pool.
According to some embodiments of the invention, the time for the first curing is 24-48 hours.
According to some embodiments of the invention, the second curing time is 3d to 28 d.
The preparation process of the wet-mixed mortar of the embodiment of the second aspect of the invention can be used for centralized metering and mixing production in a factory or a mixing plant, and can keep the quality of each batch of mortar stable. The formula can be adjusted according to needs to prepare various mortars, the preparation process is fast in material preparation and construction, and the prepared mortars are good in water retention, workability and durability, and labor, materials, money and worry are saved.
The alkaline residue used in the invention is subjected to chlorine overpressure treatment when leaving a factory, so that the alkaline residue has low chloride ion content and can be applied to wet-mixed mortar. The content of sulfate ions can influence the dry shrinkage of the wet-mixed mortar, and the problem of overlarge dry shrinkage deformation is solved by modifying the alkaline residue.
Drawings
FIG. 1 is a flow chart of a process for preparing a wet-mixed mortar.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention will be further described with reference to the examples, but the present invention is not limited to the examples.
Example 1
The embodiment provides wet-mixed mortar, which comprises the following preparation raw materials in parts by weight:
modified alkaline residue: 5 to 90 parts of a solvent, and a solvent,
cement: 180-210 parts of (A) to (B),
river sand: 1250 to 1300 parts of (a) of,
limestone powder: 5 to 90 parts of a solvent, and a solvent,
water reducing agent: 2 to 3 parts of (A) a water-soluble polymer,
water: 210-240 parts.
Wherein the water content of the modified alkaline residue is 40-50%.
The preparation method of the modified caustic sludge comprises the following steps: and adding anhydrous sodium carbonate and water into the alkaline residue, stirring for reaction, and performing suction filtration to obtain the sodium bicarbonate.
The mass ratio of the anhydrous sodium carbonate to the water to the alkaline residue is (11-18): (250-300): (200-220). The stirring reaction time is 0.5-1 h. The cement is PO52.5 ordinary portland cement.
The water reducing agent is a polycarboxylate water reducing agent which comprises PC-50, LDS-850 and LDS-10N.
Example 2
The embodiment provides a preparation process of wet-mixed mortar, the flow is shown in figure 1, and the preparation process comprises the following steps:
s1: weighing the preparation raw materials according to the proportion, adding part of the water reducing agent and water into the modified alkaline residue, and uniformly mixing to obtain an alkaline residue solution;
s2: uniformly mixing cement, river sand and limestone powder to obtain a solid mixture;
s3: uniformly mixing the caustic sludge solution obtained in the step S1 with the solid mixture obtained in the step S2 to obtain a cementing material;
S4: and (5) adding the residual water reducing agent into the cementing material obtained in the step S3, uniformly mixing, pouring the slurry into a mold, demolding after primary curing at normal temperature, and continuing secondary curing to obtain the wet-mixed mortar.
The partial water reducing agent in the step S1 is PC-50, and the remaining water reducing agents in the step S4 are LDS-10N and LDS-850.
The first curing time is 24-48 h. The time of the second curing is 3-28 days.
Example 3
In the embodiment, the wet-mixed mortar is prepared by the preparation process provided in the embodiment 2, and the preparation raw materials comprise:
modified alkaline residue: 5 parts, PO52.5 ordinary portland cement: 210 parts of river sand: 1300 parts of limestone powder: 85.5 parts of water reducing agent: 3 parts of water: 210 parts of.
The mechanical properties and durability of the prepared wet-mixed mortar were measured, and the results are shown in tables 1 and 2, using a common wet-mixed mortar as a comparison.
TABLE 1 mechanical Properties of the Wet-mix mortars prepared in example 3
TABLE 2 durability index for the wet-mixed mortar prepared in example 3
Example 4
In the embodiment, the wet-mixed mortar is prepared by the preparation process provided in the embodiment 2, and the preparation raw materials comprise:
modified alkaline residue: 9 parts, PO52.5 ordinary portland cement: 210 parts of river sand: 1300 parts of limestone powder: 81 parts of water reducing agent: 3 parts of water: 210 parts of.
The mechanical properties and durability of the prepared wet-mixed mortar were measured, and the results are shown in tables 3 and 4, using a common wet-mixed mortar as a comparison.
TABLE 3 Performance index of the wet-mixed mortar prepared in example 4
TABLE 4 durability index of the wet-mixed mortar prepared in example 4
Example 5
In the embodiment, the wet-mixed mortar is prepared by the preparation process provided in the embodiment 2, and the preparation raw materials comprise:
modified alkaline residue: 18 parts, PO52.5 ordinary portland cement: 210 parts of river sand: 1300 parts of limestone powder: 72 parts of water reducing agent: 3 parts of water: 210 parts of.
The mechanical properties and durability of the prepared wet-mixed mortar were measured, and the results are shown in tables 5 and 6, using a common wet-mixed mortar as a comparison.
TABLE 5 Performance index of the wet-mixed mortar prepared in example 5
TABLE 6 durability index of the wet-mixed mortar prepared in example 5
Example 6
In the embodiment, the wet-mixed mortar is prepared by the preparation process provided in the embodiment 2, and the preparation raw materials comprise:
modified alkaline residue: 90 parts, PO52.5 ordinary portland cement: 210 parts of river sand: 1300 parts of limestone powder: 72 parts of water reducing agent: 3 parts of water: 210 parts of.
The mechanical properties and durability of the prepared wet-mixed mortar were measured, and the results are shown in tables 7 and 8, using a common wet-mixed mortar as a comparison.
TABLE 7 Performance index of the wet-mixed mortar prepared in example 6
TABLE 8 durability index for the wet-mixed mortar prepared in example 6
Test example-modified alkali residue Wet-Mixed mortar working Performance test
Experimental groups: the modified soda residue wet-mixed mortars prepared in examples 3, 4, 5 and 6.
Control group: 210 parts of O.52.5 ordinary portland cement, 1300 parts of river sand, 90 parts of limestone powder, 210 parts of water and 3 parts of a water reducing agent.
The test method comprises the following steps: the mortar is prepared by using a mortar mixer, and then the indexes of the mortar, such as setting time, consistency value, water retention rate, air content, volume weight and the like, are measured by using a measuring instrument, as shown in Table 9.
TABLE 9 comparison of working Properties of the mortars
Group of Consistency/mm Water retention rate/%) Initial setting/h Content of air/%) Volume weight/g
Control group 86 90 22.65 18 1895
Example 3 90 92 25.17 21 1845
Example 4 94 92 26.42 19.8 1850
Example 5 95 94 24.67 22 1817
Example 6 101 99 25.68 28 1770
Detection example-test for anti-permeability performance enhancement effect of modified alkali residue wet-mixed mortar
Experimental groups: the modified soda residue wet-mixed mortars prepared in examples 3, 4, 5 and 6.
Control group: 210 parts of O.52.5 ordinary portland cement, 1300 parts of river sand, 90 parts of limestone powder, 210 parts of water and 3 parts of a water reducing agent.
The test method comprises the following steps: the mortar is prepared by a mortar mixer, and the impermeability grade performance index of the modified alkaline residue mortar is measured by a mortar impermeability instrument, wherein the impermeability performance index is shown in table 10.
TABLE 10 comparison of barrier properties
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims (10)

1. The wet-mixed mortar is characterized by comprising the following preparation raw materials in parts by weight:
modified alkaline residue: 5 to 90 parts of a solvent, and a solvent,
cement: 180-210 parts of (A) to (B),
river sand: 1250 to 1300 parts of (a) of,
limestone powder: 5 to 90 parts of a solvent, and a solvent,
water reducing agent: 2 to 3 parts of (A) a water-soluble polymer,
water: 210-240 parts.
2. The wet-mixed mortar of claim 1, wherein the modified caustic sludge has a water content of 40-50%.
3. The wet-mixed mortar according to claim 1 or 2, wherein the preparation method of the modified caustic sludge comprises the following steps: and adding anhydrous sodium carbonate and water into the alkaline residue, stirring for reaction, and performing suction filtration to obtain the sodium bicarbonate.
4. The wet-mixed mortar according to claim 3, wherein the mass ratio of the anhydrous sodium carbonate to the water to the caustic sludge is (11-18): (250-300): (200-220).
5. A wet-mixed mortar according to claim 3, characterised in that the reaction time of stirring is greater than 0.5 h.
6. The wet-mixed mortar of claim 1, wherein the cement is PO52.5 portland cement.
7. The wet-mixed mortar of claim 1, wherein the water reducer is a polycarboxylate water reducer, and the polycarboxylate water reducer comprises PC-50, LDS-850 and LDS-10N.
8. The preparation process of the wet-mixed mortar according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1: weighing the preparation raw materials according to the proportion, adding part of the water reducing agent and water into the modified alkaline residue, and uniformly mixing to obtain an alkaline residue solution;
s2: uniformly mixing cement, river sand and limestone powder to obtain a solid mixture;
s3: uniformly mixing the caustic sludge solution obtained in the step S1 with the solid mixture obtained in the step S2 to obtain a cementing material;
s4: and (5) adding the residual water reducing agent into the cementing material obtained in the step S3, uniformly mixing, pouring the slurry into a mold, demolding after primary curing at normal temperature, and continuing secondary curing to obtain the wet-mixed mortar.
9. The process for preparing wet-mixed mortar according to claim 8, wherein the first curing time is 24-48 h.
10. The process for preparing wet-mixed mortar according to claim 8, wherein the time for the second curing is 3-28 days.
CN202010684866.4A 2020-07-16 2020-07-16 Wet-mixed mortar and preparation process thereof Pending CN111848034A (en)

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Publication number Priority date Publication date Assignee Title
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JPH07277805A (en) * 1994-04-04 1995-10-24 Dousen:Kk Filling lightweight mortar composition consisting essentially of waste product from paper production
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JPH07277805A (en) * 1994-04-04 1995-10-24 Dousen:Kk Filling lightweight mortar composition consisting essentially of waste product from paper production
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