CN111747701A - Premixed dry-mixed mortar and application thereof - Google Patents
Premixed dry-mixed mortar and application thereof Download PDFInfo
- Publication number
- CN111747701A CN111747701A CN202010469143.2A CN202010469143A CN111747701A CN 111747701 A CN111747701 A CN 111747701A CN 202010469143 A CN202010469143 A CN 202010469143A CN 111747701 A CN111747701 A CN 111747701A
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- Prior art keywords
- mixed
- mixed mortar
- dry
- ready
- concrete powder
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Classifications
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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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a ready-mixed dry-mixed mortar and application thereof. The premixed dry-mixed mortar comprises the following components in parts by weight: 100 portions and 220 portions of cement; 30-220 parts of fly ash; 400 portions and 650 portions of recycled concrete powder; 240 portions of quartz sand and 300 portions of quartz sand; 0.2-1.2 parts of polycarboxylic acid water reducing agent. The ready-mixed dry-mixed mortar provided by the invention has good working performance and strength, effectively realizes the recycling of construction waste, and solves the problem of environmental pollution caused by the construction waste.
Description
Technical Field
The invention relates to premixed dry-mixed mortar and application thereof.
Background
The resource utilization of construction wastes is a hot spot in the world at present, and particularly in China, the resource utilization is one of important fields of practical circular economy and energy conservation and emission reduction. At present, the building wastes generated by the removal of China are mainly wall materials such as: the solid waste of the construction becomes a difficult problem of the construction industry, and the solid waste of the construction becomes a landfill disposal in urban and rural junctions, which causes serious environmental pollution and farmland reduction. In view of the reproducibility and resource of the building garbage, a new available way is developed, the utilization rate of the building garbage is improved, and the method has better influence on creating environment-friendly and resource-saving cities.
The premixed dry-mixed mortar is a granular or powdery material which is formed by physically mixing dry-screened aggregate, an inorganic cementing material, an additive and the like according to a certain proportion, is transported to a construction site in a bag or in bulk form, is mixed with water and can be directly used, is used for masonry and plastering engineering and can be divided into masonry mortar and plastering mortar.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the premixed dry-mixed mortar prepared from the recycled concrete powder which is used for recycling the building wastes and reducing the environmental pollution, the premixed dry-mixed mortar has excellent performance, the water retention performance of the mortar stirred by adding water is improved, the water consumption is reduced, the mortar construction performance is improved, and the quality of the dry-mixed mortar is improved while the environment is improved and the pollution is reduced.
In a first aspect, the invention provides a ready-mixed dry-mixed mortar, which comprises the following components in parts by weight:
according to some embodiments of the invention, the ready-mixed dry-mixed mortar comprises the following components in parts by weight:
according to some embodiments of the invention, the weight ratio of the fly ash to the recycled concrete powder is 1: (5-15).
According to a preferred embodiment of the present invention, the weight ratio of the fly ash to the recycled concrete powder is 1: (6-12).
According to some embodiments of the invention, the polycarboxylate water reducer comprises 0.01 wt% to 0.2 wt% of the ready-mixed dry-mixed mortar.
According to the preferred embodiment of the invention, the polycarboxylate superplasticizer accounts for 0.02-0.1 wt% of the ready-mixed dry-mixed mortar.
According to some embodiments of the invention, the cement is portland cement.
According to a preferred embodiment of the invention, the cement is P042.5 Portland cement.
According to some embodiments of the invention, the fly ash is class ii fly ash.
According to some embodiments of the invention, the recycled concrete powder has a particle size of 4mm or less.
According to some embodiments of the invention, the quartz sand has a particle size of 4mm or less.
According to some embodiments of the invention, the polycarboxylate water reducer is a powdered polycarboxylate water reducer.
According to the preferred embodiment of the invention, the water content of the polycarboxylate superplasticizer is less than or equal to 2.0%.
In a second aspect, the invention provides a method for preparing a ready-mixed dry-mixed mortar according to the first aspect, comprising: mixing cement, fly ash and a polycarboxylate superplasticizer, and then adding and mixing regenerated concrete powder and quartz sand.
According to some embodiments of the invention, the recycled concrete powder is prepared by sequentially sorting, crushing, screening and grinding waste concrete blocks.
According to a preferred embodiment of the invention, the recycled concrete powder has a particle size of 4mm or less.
In a third aspect, the invention provides a use of the ready-mixed dry-mixed mortar according to the first aspect or the ready-mixed dry-mixed mortar obtained by the preparation method according to the second aspect in the construction industry.
According to some embodiments of the invention, the ready-mixed dry-mixed mortar further comprises 100-300 parts by weight of mixing water when in use.
According to the preferred embodiment of the invention, the ready-mixed dry-mixed mortar further comprises 150-200 parts by weight of mixing water when in use.
The invention has the beneficial effects that:
according to the recycled concrete powder premixed dry-mixed mortar, the recycled concrete powder is obtained by sorting, crushing, screening and grinding the waste concrete blocks, the recycled concrete powder is used for replacing part of fine aggregates, the problem of segregation and bleeding cannot be caused, and the strength of the mortar is enhanced by using quartz sand; the powdery polycarboxylic acid water reducing agent is utilized to reduce the mixing water consumption in use, increase the later strength of the mortar and improve the plasticity and the constructability of the mortar; the invention utilizes the recycled concrete powder as the raw material, effectively realizes the purpose of changing the construction waste into valuable, solves the problem of construction waste treatment, and further solves the problem of environmental pollution caused by the construction waste.
Detailed Description
The invention will now be further illustrated by means of specific examples, but it will be understood that the scope of the invention is not limited thereto.
Example 1
The recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
wherein the main component of the cement is ordinary portland cement with the model number of P. 042.5; the fly ash is grade II fly ash; the particle size of the recycled concrete powder is less than or equal to 4 mm; the particle size of the quartz sand is less than or equal to 4 mm; the water content of the powdery polycarboxylate superplasticizer is less than or equal to 2.0 percent, and the powdery polycarboxylate superplasticizer is purchased from Shanxi Jiawei New materials GmbH and has the model of JWPCE-909P.
The recycled concrete powder premixed dry mixed sand is prepared by the following steps:
(1) preparation of recycled concrete powder
Sorting, crushing, screening and grinding the waste concrete blocks to obtain regenerated concrete powder with the particle size of less than or equal to 4 mm;
(2) preparation of recycled concrete powder premixed dry-mixed mortar
According to the weight parts, the cement, the fly ash and the powdery polycarboxylic acid water reducing agent are added into a stirrer and uniformly stirred, and then the recycled concrete powder and the quartz sand are added and fully stirred to obtain the recycled concrete powder premixed dry-mixed mortar.
Example 2
The recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
wherein the main component of the cement is ordinary portland cement with the model number of P. 042.5; the fly ash is grade II fly ash; the particle size of the recycled concrete powder is less than or equal to 4 mm; the particle size of the quartz sand is less than or equal to 4 mm; the water content of the powdery polycarboxylate superplasticizer is less than or equal to 2.0 percent, and the powdery polycarboxylate superplasticizer is purchased from Shanxi Jiawei New materials GmbH and has the model of JWPCE-909P.
The recycled concrete powder premixed dry mixed sand is prepared by the following steps:
(1) preparation of recycled concrete powder
Sorting, crushing, screening and grinding the waste concrete blocks to obtain regenerated concrete powder with the particle size of less than or equal to 4 mm;
(2) preparation of recycled concrete powder premixed dry-mixed mortar
According to the weight parts, the cement, the fly ash and the powdery polycarboxylic acid water reducing agent are added into a stirrer and uniformly stirred, and then the recycled concrete powder and the quartz sand are added and fully stirred to obtain the recycled concrete powder premixed dry-mixed mortar.
Example 3
The recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
wherein the main component of the cement is ordinary portland cement with the model number of P. 042.5; the fly ash is grade II fly ash; the particle size of the recycled concrete powder is less than or equal to 4 mm; the particle size of the quartz sand is less than or equal to 4 mm; the water content of the powdery polycarboxylate superplasticizer is less than or equal to 2.0 percent, and the powdery polycarboxylate superplasticizer is purchased from Shanxi Jiawei New materials GmbH and has the model of JWPCE-909P.
The recycled concrete powder premixed dry mixed sand is prepared by the following steps:
(1) preparation of recycled concrete powder
Sorting, crushing, screening and grinding the waste concrete blocks to obtain regenerated concrete powder with the particle size of less than or equal to 4 mm;
(2) preparation of recycled concrete powder premixed dry-mixed mortar
According to the weight parts, the cement, the fly ash and the powdery polycarboxylic acid water reducing agent are added into a stirrer and uniformly stirred, and then the recycled concrete powder and the quartz sand are added and fully stirred to obtain the recycled concrete powder premixed dry-mixed mortar.
Example 4
The recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
wherein the main component of the cement is ordinary portland cement with the model number of P. 042.5; the fly ash is grade II fly ash; the particle size of the recycled concrete powder is less than or equal to 4 mm; the particle size of the quartz sand is less than or equal to 4 mm; the water content of the powdery polycarboxylate superplasticizer is less than or equal to 2.0 percent, and the powdery polycarboxylate superplasticizer is purchased from Shanxi Jiawei New materials GmbH and has the model of JWPCE-909P.
The recycled concrete powder premixed dry mixed sand is prepared by the following steps:
(1) preparation of recycled concrete powder
Sorting, crushing, screening and grinding the waste concrete blocks to obtain regenerated concrete powder with the particle size of less than or equal to 4 mm;
(2) preparation of recycled concrete powder premixed dry-mixed mortar
According to the weight parts, the cement, the fly ash and the powdery polycarboxylic acid water reducing agent are added into a stirrer and uniformly stirred, and then the recycled concrete powder and the quartz sand are added and fully stirred to obtain the recycled concrete powder premixed dry-mixed mortar.
Example 5
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 6
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 7
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 8
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 9
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 10
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 11
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 12
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
example 13
The difference from the example 1 is that the recycled concrete powder premixed dry-mixed mortar comprises the following components in parts by weight:
test example
When the premixed dry-mixed mortar is used, 170 parts by weight of blending water is added, and the test methods of the mortar consistency, the 2-hour consistency loss rate, the water retention rate, the 7d compressive strength and the 28d compressive strength of the recycled concrete powder premixed dry-mixed mortar obtained in examples 1 to 13 are tested according to the test method of GB/T25181-2019 premixed mortar, and the results are shown in Table 1.
TABLE 1
The recycled concrete powder is used as a material for partially replacing the fine aggregate, so that the waste concrete material is utilized, the cost is saved, the environment is protected, the use of the fine aggregate in the preparation of the dry-mixed mortar is effectively reduced, and the natural resources are saved.
The consistency, water retention rate and compressive strength of 7d and 28d of each example in the table 1 show that the recycled concrete powder premixed dry-mixed mortar prepared by the invention can meet the use requirements of most dry-mixed mortars.
From the above, the inventors of the present invention have obtained through a large number of experiments the recycled concrete powder ready-mixed dry-mixed mortar of the present invention, which comprises components in a specific weight part range, and has good workability and strength.
In the description herein, references to the description of the terms "embodiment 1," "embodiment 2," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The ready-mixed dry-mixed mortar comprises the following components in parts by weight:
2. the ready-mixed dry-mixed mortar according to claim 1, comprising the following components in parts by weight:
3. the ready-mixed dry-mixed mortar according to claim 1 or 2, wherein the weight ratio of the fly ash to the recycled concrete powder is 1: (5-15), preferably 1: (6-12).
4. The ready-mixed dry-mixed mortar according to any one of claims 1 to 3, wherein the polycarboxylic acid water reducer accounts for 0.01 to 0.2 wt%, preferably 0.02 to 0.1 wt% of the ready-mixed dry-mixed mortar.
5. The ready-mixed dry-mixed mortar according to any one of claims 1 to 4, wherein the cement is Portland cement, preferably P042.5 Portland cement; the fly ash is class II fly ash.
6. The ready-mixed dry-mixed mortar according to any one of claims 1 to 5, wherein the recycled concrete powder has a particle size of 4mm or less; the grain size of the quartz sand is less than or equal to 4 mm.
7. The ready-mixed dry-mixed mortar according to any one of claims 1 to 6, wherein the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and preferably has a water content of less than or equal to 2.0%.
8. A method of preparing a ready-mixed dry-mixed mortar according to any one of claims 1 to 7, comprising:
mixing cement, fly ash and a polycarboxylate superplasticizer, and then adding and mixing regenerated concrete powder and quartz sand.
9. The method of claim 8, wherein the recycled concrete powder is prepared by sequentially sorting, crushing, sieving and grinding the waste concrete blocks.
10. Use of the ready-mixed dry-mixed mortar according to any one of claims 1 to 7 or obtained by the preparation method according to claim 8 or 9 in the construction industry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010469143.2A CN111747701A (en) | 2020-05-28 | 2020-05-28 | Premixed dry-mixed mortar and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010469143.2A CN111747701A (en) | 2020-05-28 | 2020-05-28 | Premixed dry-mixed mortar and application thereof |
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| CN111747701A true CN111747701A (en) | 2020-10-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112661452A (en) * | 2020-12-30 | 2021-04-16 | 湖南大学 | Regenerated UHPC (ultra high performance polycarbonate) cement mortar and preparation method thereof |
| TWI773369B (en) * | 2021-06-09 | 2022-08-01 | 方建弘 | Regenerated concrete composition |
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2020
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| TWI773369B (en) * | 2021-06-09 | 2022-08-01 | 方建弘 | Regenerated concrete composition |
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Application publication date: 20201009 |