CN112608093A - Dry-mixed plastering mortar prepared from recycled aggregate and preparation method thereof - Google Patents
Dry-mixed plastering mortar prepared from recycled aggregate and preparation method thereof Download PDFInfo
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- CN112608093A CN112608093A CN202010737369.6A CN202010737369A CN112608093A CN 112608093 A CN112608093 A CN 112608093A CN 202010737369 A CN202010737369 A CN 202010737369A CN 112608093 A CN112608093 A CN 112608093A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000007822 coupling agent Substances 0.000 claims abstract description 35
- 239000002699 waste material Substances 0.000 claims abstract description 35
- 238000010276 construction Methods 0.000 claims abstract description 23
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 21
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 21
- 229920000570 polyether Polymers 0.000 claims abstract description 21
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 239000011398 Portland cement Substances 0.000 claims abstract description 16
- 229920005862 polyol Polymers 0.000 claims abstract description 16
- 150000003077 polyols Chemical class 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000005303 weighing Methods 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 28
- 239000002002 slurry Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000004567 concrete Substances 0.000 claims description 19
- 235000019441 ethanol Nutrition 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 8
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 7
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 7
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 7
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 7
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 7
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 7
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 7
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 7
- 229920000609 methyl cellulose Polymers 0.000 claims description 7
- 239000001923 methylcellulose Substances 0.000 claims description 7
- 235000010981 methylcellulose Nutrition 0.000 claims description 7
- 239000003595 mist Substances 0.000 claims description 7
- 239000012466 permeate Substances 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- INJVFBCDVXYHGQ-UHFFFAOYSA-N n'-(3-triethoxysilylpropyl)ethane-1,2-diamine Chemical compound CCO[Si](OCC)(OCC)CCCNCCN INJVFBCDVXYHGQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- HXLAEGYMDGUSBD-UHFFFAOYSA-N 3-[diethoxy(methyl)silyl]propan-1-amine Chemical compound CCO[Si](C)(OCC)CCCN HXLAEGYMDGUSBD-UHFFFAOYSA-N 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 4
- PHQOGHDTIVQXHL-UHFFFAOYSA-N n'-(3-trimethoxysilylpropyl)ethane-1,2-diamine Chemical compound CO[Si](OC)(OC)CCCNCCN PHQOGHDTIVQXHL-UHFFFAOYSA-N 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 239000004576 sand Substances 0.000 abstract description 18
- 239000000243 solution Substances 0.000 description 39
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- HYZAWROTMYAUAQ-UHFFFAOYSA-N 1-ethyl-3-(6-methylpyridin-2-yl)urea Chemical compound CCNC(=O)NC1=CC=CC(C)=N1 HYZAWROTMYAUAQ-UHFFFAOYSA-N 0.000 description 3
- 230000001476 alcoholic effect Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004137 mechanical activation Methods 0.000 description 2
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- 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
- C04B20/00—Use 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
- C04B20/02—Treatment
-
- 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
- C04B20/00—Use 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B20/00—Use 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
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- 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
- C04B28/08—Slag 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
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides dry-mixed plastering mortar prepared by utilizing recycled aggregate and a preparation method thereof, wherein the preparation method comprises the following steps: repeatedly crushing, refining, cleaning and screening the construction waste to obtain recycled fine aggregate; modifying the recycled fine aggregate by adopting polyether polyol, sodium silicate and a coupling agent to obtain modified recycled fine aggregate; and weighing the portland cement, the modified recycled fine aggregate, the fly ash and the water-retaining agent according to the parts by weight, and uniformly mixing to obtain the dry-mixed plastering mortar. According to the technical scheme, the recycled fine aggregate is modified, so that the water retention rate of the obtained modified recycled fine aggregate dry-mixed plastering mortar is improved by about 20%, the setting time is improved by about 4%, the consistency loss rate of 2h is reduced by about 30%, the 14d tensile bonding strength is improved by about 174%, the 28d shrinkage rate is reduced by about 49%, the performance of the modified recycled fine aggregate dry-mixed plastering mortar is equivalent to that of the natural river sand dry-mixed plastering mortar, even slightly superior, the utilization of construction waste is realized, and the waste is changed into the resource.
Description
Technical Field
The invention relates to the technical field of resource utilization of construction waste and production of building materials, in particular to dry-mixed plastering mortar prepared by utilizing recycled aggregate and a preparation method thereof.
Background
Aggregate formed by crushing and grading construction waste (mainly comprising waste concrete, waste bricks and the like) is called recycled concrete aggregate, and is called recycled aggregate for short. With the improvement of environmental awareness of modern society, people pay more and more attention to the problem of recycling a large amount of waste concrete generated in the building industry. The development and application of the recycled concrete aggregate can greatly utilize the waste concrete and reduce the consumption of the natural aggregate in the construction industry; on the other hand, the problems of the gradual deterioration of the ecological environment and the like caused by concrete waste can be reduced, and the sustainable development of the human society is ensured.
However, compared with natural aggregate, the recycled aggregate has the characteristics of low strength, more corner cracks, high surface inerting degree, high porosity, high water absorption, high mud content and the like, and the working performance, mechanical property and durability of the recycled cement product prepared by the recycled aggregate are difficult to meet the engineering requirements. The recycled aggregate is mainly used for manufacturing medium-low-strength concrete at present, has a narrow application range, and is generally used for road engineering cushion layers, plain concrete cushion layers, large-volume concrete, low-strength concrete of non-load-bearing structures and the like. If the application range is widened, the recycled aggregate needs to be activated and strengthened, and the strength of the recycled aggregate is improved.
At present, research reports and patents on reinforcing aggregate performance by using a binder, a waterproof agent and the like are reported, but the concrete raw materials adopted in these publications are all from natural river sand, and the strength, waterproof performance and the like of the concrete are further enhanced on the basis of the natural river sand. However, the concrete in the construction and removal waste has been used for decades, and the recycled aggregate prepared from the concrete has the characteristics of low strength, more corner cracks, high surface inerting degree, high porosity, high water absorption, high mud content and the like, and the technical difficulty of activating and strengthening the recycled aggregate is higher, so that the existing literature method is not suitable for the recycled aggregate.
Therefore, it is urgently needed to provide a method for effectively activating and strengthening recycled aggregate, so that the recycled aggregate can be applied to dry-mixed plastering mortar instead of natural sand.
Disclosure of Invention
The invention aims to provide a method for preparing dry-mixed plastering mortar by using recycled fine aggregate to replace natural sand, so as to solve the problems of more cracks, low strength and narrow application range of the conventional recycled fine aggregate.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a method for preparing a dry-mixed plastering mortar using recycled aggregate, comprising the steps of:
(1) preparing modified recycled fine aggregate:
a. repeatedly crushing, refining, cleaning and screening the construction waste to obtain recycled fine aggregate with the particle size of 0.08-4.75 mm;
b. weighing polyether polyol and sodium silicate according to the weight parts, uniformly mixing, adding water, fully stirring and dissolving to obtain a modified slurry solution;
c. uniformly spraying the modified slurry solution on the surface of the recycled fine aggregate under stirring, so that the surface of the recycled fine aggregate is soaked by the modified slurry solution, the modified slurry solution fully permeates into microcracks of the recycled fine aggregate, and then standing and airing to obtain pretreated fine aggregate;
d. dissolving a coupling agent in absolute ethyl alcohol to prepare a coupling agent alcohol solution;
e. placing the pretreated fine aggregate into a high-speed mixer, pumping a coupling agent alcohol solution in a fine mist shape under stirring, stirring for 10-30 min, and preparing the modified recycled fine aggregate after absolute ethyl alcohol is completely volatilized;
(2) preparing dry-mixed plastering mortar:
weighing portland cement, modified recycled fine aggregate, fly ash and a water-retaining agent according to the weight parts, and uniformly mixing to obtain the dry-mixed plastering mortar.
In a preferred embodiment of the invention, the mass ratio of the polyether polyol, the sodium silicate and the water is 0.5-2: 3-5: 100.
In a preferred embodiment of the invention, the mass ratio of the coupling agent to the absolute ethyl alcohol is 0.2-1.5: 100.
In a preferred embodiment of the invention, the mass ratio of the portland cement, the modified recycled fine aggregate, the fly ash and the water-retaining agent is 120-170: 600-800: 60-100: 0.1-0.3.
In a preferred embodiment of the present invention, the construction waste is one or more of construction waste concrete, waste masonry, crushed stone, crushed brick and tile, and waste mortar.
In a preferred embodiment of the invention, the polyether polyol is PEG or PPG, and the molecular weight is 200-5000.
In a preferred embodiment of the present invention, the coupling agent is one or more of N- [3- (trimethoxysilyl) propyl ] ethylenediamine, N-aminoethyl-3-aminopropyltriethoxysilane, 3- (diethoxymethylsilyl) propylamine.
In a preferred embodiment of the present invention, the portland cement is one or a mixture of ordinary portland cement and portland slag cement.
In a preferred embodiment of the invention, the fly ash is a primary or secondary fly ash.
In a preferred embodiment of the present invention, the water retaining agent is one or more of Methylcellulose (MC), Hydroxyethylcellulose (HEC), Hydroxyethylmethylcellulose (HEMC) and Hydroxypropylmethylcellulose (HPMC).
In a second aspect of the invention, there is provided a dry-mixed plastering mortar prepared by using recycled aggregate, wherein the dry-mixed plastering mortar is prepared by the method of the first aspect of the invention.
The invention has the advantages of
Different from the prior art, the technical scheme activates and strengthens the recycled aggregate formed by the waste building rubbish, so that the recycled aggregate can be applied to dry-mixed plastering mortar instead of natural sand, and the resource utilization of the building rubbish is realized. Specifically, the technical scheme has the following beneficial effects:
(1) according to the technical scheme, the construction waste is repeatedly crushed, refined, cleaned and screened, the aim is to effectively remove fragile edges and corners on aggregate particles and hardened mortar adhered to the surfaces of broken stones by adopting a mechanical activation treatment mode, the performance of the aggregate is improved, and then the high-quality recycled fine aggregate with the particle size of 0.08-4.75 mm is obtained by screening and grading.
(2) The technical scheme is that the regenerated fine aggregate is sprayed by the polyether polyol and the sodium silicate aqueous solution, the surface of the regenerated fine aggregate is infiltrated by the polyether polyol and the sodium silicate aqueous solution in the stirring process, and the polyether polyol and the sodium silicate aqueous solution fully penetrate into microcracks of the regenerated fine aggregate, wherein the sodium silicate and cement hydration products Ca (OH) on the surface of the regenerated fine aggregate2The calcium silicate colloid is generated by reaction, the generated calcium silicate colloid effectively fills the microcracks of the recycled fine aggregate, and the porosity of the recycled fine aggregate is effectively reduced, so that the compactness of the recycled fine aggregate is greatly improved.
(3) According to the technical scheme, the coupling agent is adopted, a bridging structure of a fine aggregate interface-coupling agent-polyether polyol-coupling agent-aggregate interface is formed in pores and microcracks of the recycled fine aggregate, and the effects of filling the pores of the recycled fine aggregate, bonding the cracks of the recycled aggregate, toughening and reinforcing and inhibiting crack expansion are achieved, so that the problems of low aggregate strength, high porosity, high water absorption and poor impermeability caused by the existence of microcracks after stress of the aggregate in the process of recycling and crushing are solved, and the performance of the recycled fine aggregate is improved.
(4) The recycled fine aggregate is modified and enhanced, various properties of the recycled fine aggregate reach the properties of the natural fine aggregate, and part of the properties are even better than those of the natural fine aggregate.
(5) The dry-mixed plastering mortar prepared by the modified recycled fine aggregate has high strength, does not bulge or crack after being coated on a wall, has good workability and convenient construction, and all properties of the dry-mixed plastering mortar meet the requirements of national standards.
Detailed Description
The following is a detailed description of a method for preparing a dry-mixed plastering mortar using recycled aggregate according to the first aspect of the present invention, and a dry-mixed plastering mortar prepared using recycled aggregate according to the second aspect of the present invention.
First, a method for preparing a dry-mixed plastering mortar using recycled aggregate according to the first aspect of the present invention will be described, which comprises the steps of:
(1) preparing modified recycled fine aggregate:
a. repeatedly crushing, refining, cleaning and screening the construction waste to obtain recycled fine aggregate with the particle size of 0.08-4.75 mm;
b. weighing polyether polyol and sodium silicate according to the weight parts, uniformly mixing, adding water, fully stirring and dissolving to obtain a modified slurry solution;
c. uniformly spraying the modified slurry solution on the surface of the recycled fine aggregate under stirring, so that the surface of the recycled fine aggregate is soaked by the modified slurry solution, the modified slurry solution fully permeates into microcracks of the recycled fine aggregate, and then standing and airing to obtain pretreated fine aggregate;
d. dissolving a coupling agent in absolute ethyl alcohol to prepare a coupling agent alcohol solution;
e. placing the pretreated fine aggregate into a high-speed mixer, pumping a coupling agent alcohol solution in a fine mist shape under stirring, stirring for 10-30 min, and preparing the modified recycled fine aggregate after absolute ethyl alcohol is completely volatilized;
(2) preparing dry-mixed plastering mortar:
weighing portland cement, modified recycled fine aggregate, fly ash and a water-retaining agent according to the weight parts, and uniformly mixing to obtain the dry-mixed plastering mortar.
According to the technical scheme, the construction waste is repeatedly crushed, refined, cleaned and screened, the aim is to effectively remove fragile edges and corners on aggregate particles and hardened mortar adhered to the surfaces of broken stones by adopting a mechanical activation treatment mode, the performance of the aggregate is improved, and then the high-quality recycled fine aggregate with the particle size of 0.08-4.75 mm is obtained by screening and grading. The surface of the recycled fine aggregate which is not modified contains a large amount of microcracks, so that the recycled aggregate has high porosity and high water absorption. The technical scheme adopts polyether polyol, sodium silicate and a coupling agent to modify the recycled fine aggregate, wherein the sodium silicate can be mixed with a cement hydration product Ca (OH) on the surface of the recycled fine aggregate2Calcium silicate colloid is generated through reaction to effectively fill microcracks of the recycled fine aggregate and reduce the porosity of the recycled fine aggregate, so that the compactness of the recycled fine aggregate is improved; the polyether polyol and the coupling agent can form a fine aggregate interface-coupling agent-polyether polyol-coupling agent-aggregate interface bridging structure in pores and microcracks of the recycled fine aggregate, and play a role in filling the pores of the recycled fine aggregate, bonding the cracks of the recycled aggregate, toughening and reinforcing and inhibiting crack expansion, so that the problems of low aggregate strength, high porosity, large water absorption and poor impermeability caused by the existence of microcracks after stress of the aggregate in the process of recycling and crushing are solved, and the performance of the recycled fine aggregate is improved.
In a preferred embodiment of the invention, the mass ratio of the polyether polyol, the sodium silicate and the water is 0.5-2: 3-5: 100.
In a preferred embodiment of the invention, the mass ratio of the coupling agent to the absolute ethyl alcohol is 0.2-1.5: 100.
In a preferred embodiment of the invention, the mass ratio of the portland cement, the modified recycled fine aggregate, the fly ash and the water-retaining agent is 120-170: 600-800: 60-100: 0.1-0.3.
In a preferred embodiment of the present invention, the construction waste is one or more of construction waste concrete, waste masonry, crushed stone, crushed brick and tile, and waste mortar.
In a preferred embodiment of the invention, the polyether polyol is PEG or PPG, and the molecular weight is 200-5000.
In a preferred embodiment of the present invention, the coupling agent is one or more of N- [3- (trimethoxysilyl) propyl ] ethylenediamine, N-aminoethyl-3-aminopropyltriethoxysilane, 3- (diethoxymethylsilyl) propylamine.
In a preferred embodiment of the present invention, the portland cement is one or a mixture of ordinary portland cement and portland slag cement.
In a preferred embodiment of the invention, the fly ash is a primary or secondary fly ash.
In a preferred embodiment of the present invention, the water retaining agent is one or more of Methylcellulose (MC), Hydroxyethylcellulose (HEC), Hydroxyethylmethylcellulose (HEMC) and Hydroxypropylmethylcellulose (HPMC).
Next, a dry-mixed plastering mortar prepared by using the recycled aggregate according to the second aspect of the present invention, which is prepared by the method according to the first aspect of the present invention, will be described.
As proved by a large amount of process research and production practice exploration of the inventor, when the preparation process for preparing the dry-mixed plastering mortar by using the recycled aggregate comprises the raw material components, the mass ratio and the process conditions, all index tests of the dry-mixed plastering mortar prepared by the method of the first aspect of the invention meet the requirements of GB/T25181 and 2019 premixed mortar, and partial performances of the dry-mixed plastering mortar are even better than those of the dry-mixed plastering mortar prepared by natural river sand. In engineering construction, the modified recycled fine aggregate is adopted to replace natural river sand, so that the consumption of the natural sand in the large-scale engineering construction in China at present can be greatly reduced, mineral resources and energy sources are saved, the ecological environment is protected, and the construction waste is utilized to change waste into valuable. In addition, the dry-mixed plastering mortar prepared by the modified recycled fine aggregate has high strength, does not bulge or crack after being coated on a wall, and has good workability and convenient construction.
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments. The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
The raw material components, reagents, equipment and the like used in the examples of the present invention are commercially available unless otherwise specified.
EXAMPLE 1 preparation of Dry-mix plastering mortar RDP-1
(1) Modified recycled fine aggregate
a. Repeatedly crushing, refining, cleaning and screening the building waste concrete to obtain the recycled fine aggregate with the particle size of 0.08-4.75 mm.
b. Weighing polyether polyol PEG400 and sodium silicate, uniformly mixing, adding water, fully stirring and dissolving to obtain a modified slurry solution, wherein the mass ratio of the PEG400 to the sodium silicate to the water is 0.5:4.5: 100.
c. And (3) uniformly spraying the modified slurry solution on the surface of the recycled fine aggregate under stirring, so that the surface of the recycled fine aggregate is soaked by the modified slurry solution, the modified slurry solution fully permeates into microcracks of the fine aggregate, and then standing and airing to obtain the pretreated fine aggregate.
d. Dissolving a coupling agent N- [3- (trimethoxysilyl) propyl ] ethylenediamine in absolute ethyl alcohol to prepare a coupling agent alcoholic solution, wherein the mass ratio of the coupling agent to the absolute ethyl alcohol is 0.2: 100.
e. And (3) putting the pretreated fine aggregate into a high-speed mixer, pumping the coupling agent alcohol solution in a fine mist state under stirring, stirring for 25min, and after the absolute ethyl alcohol is completely volatilized, preparing the modified recycled fine aggregate MRFA-1.
(2) Preparation of Dry-mix plastering mortar
164 parts of ordinary portland cement (P.O 32.5.5), 776 parts of modified recycled fine aggregate (MRFA-1), 60 parts of secondary fly ash and 0.25 part of methyl cellulose are weighed according to parts by weight and uniformly mixed to prepare the recycled fine aggregate dry-mixed plastering mortar RDP-1.
EXAMPLE 2 preparation of Dry-mix plastering mortar RDP-2
(1) Modified recycled fine aggregate
a. Repeatedly crushing, refining, cleaning and screening the waste masonry to obtain the recycled fine aggregate with the particle size of 0.08-4.75 mm.
b. Weighing polyether glycol PPG1000 and sodium silicate, uniformly mixing, adding water, fully stirring and dissolving to obtain a modified slurry solution, wherein the weight ratio of PPG1000 to sodium silicate to water is 1:3.5: 100.
c. And (3) uniformly spraying the modified slurry solution on the surface of the recycled fine aggregate under stirring, so that the surface of the recycled fine aggregate is soaked by the modified slurry solution, the modified slurry solution fully permeates into microcracks of the fine aggregate, and then standing and airing to obtain the pretreated fine aggregate.
d. Dissolving a coupling agent N-aminoethyl-3-aminopropyltriethoxysilane in absolute ethanol to prepare a coupling agent alcoholic solution, wherein the mass ratio of the coupling agent to the absolute ethanol is 0.5: 100.
e. And (3) putting the pretreated fine aggregate into a high-speed mixer, pumping the coupling agent alcohol solution in a fine mist state under stirring, stirring for 30min, and after the absolute ethyl alcohol is completely volatilized, preparing the modified recycled fine aggregate MRFA-2.
(2) Preparation of Dry-mix plastering mortar
170 parts of ordinary portland cement (P.O 42.5.5), 740 parts of modified recycled fine aggregate (MRFA-2), 80 parts of first-stage fly ash and 0.3 part of hydroxyethyl cellulose are weighed according to the parts by weight and uniformly mixed to prepare the recycled fine aggregate dry-mixed plastering mortar RDP-2.
EXAMPLE 3 preparation of Dry-mix plastering mortar RDP-3
(1) Modified recycled fine aggregate
a. Repeatedly crushing, refining, cleaning and screening the waste mortar to obtain recycled fine aggregate with the particle size of 0.08-4.75 mm.
b. Weighing polyether glycol PPG4000 and sodium silicate, uniformly mixing, adding water, fully stirring and dissolving to obtain a modified slurry solution, wherein the weight ratio of PPG4000 to sodium silicate to water is 1.5:4: 100.
c. And (3) uniformly spraying the modified slurry solution on the surface of the recycled fine aggregate under stirring, so that the surface of the recycled fine aggregate is soaked by the modified slurry solution, the modified slurry solution fully permeates into microcracks of the fine aggregate, and then standing and airing to obtain the pretreated fine aggregate.
d. Dissolving a coupling agent 3- (diethoxymethyl silyl) propylamine in absolute ethyl alcohol to prepare a coupling agent alcohol solution, wherein the mass ratio of the coupling agent to the absolute ethyl alcohol is 1: 100.
e. And (3) putting the pretreated fine aggregate into a high-speed mixer, pumping the coupling agent alcohol solution in a fine mist state under stirring, stirring for 20min, and after the absolute ethyl alcohol is completely volatilized, preparing the modified recycled fine aggregate MRFA-3.
(2) Preparation of Dry-mix plastering mortar
150 parts of Portland slag cement (P.S 32.5.5), 750 parts of modified recycled fine aggregate (MRFA-3), 100 parts of first-grade fly ash and 0.15 part of hydroxyethyl methyl cellulose are weighed according to the parts by weight and uniformly mixed to prepare the recycled fine aggregate dry-mixed plastering mortar RDP-3.
EXAMPLE 4 preparation of Dry-mix plastering mortar RDP-4
(1) Modified recycled fine aggregate
a. Repeatedly crushing, refining, cleaning and screening the building waste concrete to obtain the recycled fine aggregate with the particle size of 0.08-4.75 mm.
b. Weighing polyether glycol PEG2000 and sodium silicate, uniformly mixing, adding water, fully stirring and dissolving to obtain a modified slurry solution, wherein the mass ratio of the PEG2000 to the sodium silicate to the water is 2:3: 100.
c. And (3) uniformly spraying the modified slurry solution on the surface of the recycled fine aggregate under stirring, so that the surface of the recycled fine aggregate is soaked by the modified slurry solution, the modified slurry solution fully permeates into microcracks of the fine aggregate, and then standing and airing to obtain the pretreated fine aggregate.
d. Dissolving a coupling agent N-aminoethyl-3-aminopropyltriethoxysilane in absolute ethanol to prepare a coupling agent alcoholic solution, wherein the dosage mass ratio of the coupling agent to the absolute ethanol is 1.5: 100.
e. And (3) putting the pretreated fine aggregate into a high-speed mixer, pumping the coupling agent alcohol solution in a fine mist state under stirring, stirring for 10min, and after the absolute ethyl alcohol is completely volatilized, preparing the modified recycled fine aggregate MRFA-4.
(2) Preparation of Dry-mix plastering mortar
160 parts of Portland slag cement (P.S 42.5.5), 700 parts of modified recycled fine aggregate (MRFA-4), 80 parts of secondary fly ash and 0.20 part of hydroxypropyl methyl cellulose are weighed and uniformly mixed to prepare the recycled fine aggregate dry-mixed plastering mortar RDP-4.
Comparative examples 1 to 4
The modified recycled fine aggregates MRFA-1 to MRFA-4 of the dry-mixed plastering mortar of examples 1 to 4 were replaced with natural river sand to prepare corresponding comparative examples NDP-1 to NDP-4.
Comparative examples 5 to 8
The recycled fine aggregates which are not modified in the examples 1 to 4 are marked as recycled fine aggregates 1 to 4, and the recycled fine aggregates 1 to 4 are respectively prepared into dry-mixed plastering mortars UDP-1 to UDP-4.
The modified recycled fine aggregates MRFA-1 to MRFA-4 in examples 1 to 4, the natural river sand in comparative examples 1 to 4 and the recycled fine aggregates 1 to 4 which are not modified in comparative examples 5 to 8 are respectively detected according to the standard of GB/T14684- "construction sand", and the detection results are shown in Table 1.
TABLE 1 Fine aggregate Performance parameter comparison Table
| Fine aggregate | Mass loss/%) | Single stage maximum crush index/%) | Bulk density/(kg/m)3) | Water absorption/%) |
| MRFA-1 | 6.3 | 15.5 | 1440 | 1.1 |
| MRFA-2 | 6.8 | 16.3 | 1450 | 1.3 |
| MRFA-3 | 7.1 | 14.7 | 1430 | 1.2 |
| MRFA-4 | 7.5 | 15.8 | 1460 | 1.3 |
| Natural river sand | 7.6 | 17.4 | 1430 | 1.6 |
| Recycled Fine aggregate 1 | 13.5 | 32.1 | 1320 | 4.7 |
| Recycled fine aggregate 2 | 12.4 | 33.5 | 1350 | 4.8 |
| Recycled fine aggregate 3 | 14.8 | 31.9 | 1330 | 4.6 |
| Recycled fine aggregate 4 | 12.7 | 34.2 | 1360 | 4.7 |
The detection results in table 1 show that the water absorption and crushing value indexes of the recycled fine aggregate can be effectively reduced through modification treatment (activation and strengthening treatment), the compactness is improved, and the quality loss is reduced, so that the technical scheme of the invention effectively solves the problems of low strength, high porosity, large water absorption and poor impermeability of the aggregate caused by microcracks existing after the aggregate is stressed in the recycling and crushing process, and greatly improves the performance of the recycled fine aggregate. In addition, all performance parameters of the modified recycled fine aggregate meet the standard requirements, are equivalent to or even slightly better than natural river sand, and indicate that the modified recycled fine aggregate can replace the natural river sand to be applied to preparing dry-mixed plastering mortar.
The dry-mixed plastering mortars (RDP-1, RDP-2, RDP-3 and RDP-4) prepared in examples 1 to 4, the dry-mixed plastering mortars (NDP-1, NDP-2, NDP-3 and NDP-4) prepared in comparative examples 1 to 4 and the dry-mixed plastering mortars (UDP-1, UDP-2, UDP-3 and UDP-4) prepared in comparative examples 5 to 8 were subjected to performance tests according to the standard of GB/T25181-:
TABLE 2 comparison table of dry-mixed plastering mortar performance
From the test results in Table 2, it can be seen that the dry-mixed plastering mortars RDP-1 to RDP-4 prepared by using the modified recycled fine aggregate in examples 1 to 4 have about 20% higher water retention, about 4% higher setting time, about 30% lower 2h consistency loss, about 174% higher 14d tensile bond strength and about 49% lower 28d shrinkage than the dry-mixed plastering mortars UDP-1 to UDP-4 prepared by using the unmodified recycled fine aggregates 1 to 4 in comparative examples 5 to 8. In addition, compared with the dry-mixed plastering mortars NDP-1 to NDP-4 prepared by adopting the natural river sand in the comparative examples 1 to 4, the dry-mixed plastering mortars RDP-1 to RDP-4 prepared by adopting the modified recycled fine aggregate in the examples 1 to 4 have the same performance in the aspects of water retention rate, setting time, 2h consistency loss rate, 28d shrinkage rate and the like, and have small difference; and in 14d tensile bonding strength, RDP-1 to RDP-4 are superior to corresponding comparative examples NDP-1 to NDP-4, which shows that the modified recycled fine aggregate can completely replace natural river sand, and the performance of the dry-mixed plastering mortar prepared by the modified recycled fine aggregate is slightly superior to that of the dry-mixed plastering mortar prepared by the corresponding natural river sand.
The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, wherein technical parameters and raw material components which are not described in detail in the invention are changed within the range of the listed parameters, and the technical effects which are the same as or similar to the above-mentioned examples can be obtained, and still belong to the protection scope of the invention.
Finally, it is to be understood that those skilled in the art, on the basis of the method and technical disclosure disclosed above, may make numerous changes and modifications to the technical disclosure of the present invention, or may modify equivalent embodiments to equivalent variations, without departing from the scope of the technical disclosure of the present invention. Therefore, any simple modification, equivalent change and modification of the above embodiments, or the application of the above technical solutions to other related technical fields directly or indirectly by using the equivalent technical parameters, equivalent raw material components or equivalent process flow transformation performed in the present specification without departing from the technical solution of the present invention, shall still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A method for preparing dry-mixed plastering mortar by using recycled aggregate is characterized by comprising the following steps:
(1) preparing modified recycled fine aggregate:
a. repeatedly crushing, refining, cleaning and screening the construction waste to obtain recycled fine aggregate with the particle size of 0.08-4.75 mm;
b. weighing polyether polyol and sodium silicate according to the weight parts, uniformly mixing, adding water, fully stirring and dissolving to obtain a modified slurry solution;
c. uniformly spraying the modified slurry solution on the surface of the recycled fine aggregate under stirring, so that the surface of the recycled fine aggregate is soaked by the modified slurry solution, the modified slurry solution fully permeates into microcracks of the recycled fine aggregate, and then standing and airing to obtain pretreated fine aggregate;
d. dissolving a coupling agent in absolute ethyl alcohol to prepare a coupling agent alcohol solution;
e. placing the pretreated fine aggregate into a high-speed mixer, pumping a coupling agent alcohol solution in a fine mist shape under stirring, stirring for 10-30 min, and preparing the modified recycled fine aggregate after absolute ethyl alcohol is completely volatilized;
(2) preparing dry-mixed plastering mortar:
weighing portland cement, modified recycled fine aggregate, fly ash and a water-retaining agent according to the weight parts, and uniformly mixing to obtain the dry-mixed plastering mortar.
2. The method for preparing the dry-mixed plastering mortar by using the recycled aggregate as claimed in claim 1, wherein the mass ratio of the polyether polyol, the sodium silicate and the water is 0.5-2: 3-5: 100.
3. The method for preparing the dry-mixed plastering mortar by using the recycled aggregate according to claim 1, wherein the mass ratio of the coupling agent to the absolute ethyl alcohol is 0.2-1.5: 100.
4. The method for preparing the dry-mixed plastering mortar by using the recycled aggregate as claimed in claim 1, wherein the mass ratio of the portland cement, the modified recycled fine aggregate, the fly ash and the water-retaining agent is 120-170: 600-800: 60-100: 0.1-0.3.
5. The method for preparing dry-mixed plastering mortar by using recycled aggregate according to claim 1, wherein the construction waste is one or more of construction waste concrete, waste masonry, crushed stone, broken brick and tile, and waste mortar.
6. The method for preparing the dry-mixed plastering mortar by using the recycled aggregate according to claim 1, wherein the polyether polyol is PEG or PPG, and the molecular weight range is 200-5000.
7. The method for preparing a dry-mixed plastering mortar using recycled aggregate as claimed in claim 1, wherein the coupling agent is one or more of N- [3- (trimethoxysilyl) propyl ] ethylenediamine, N-aminoethyl-3-aminopropyltriethoxysilane, and 3- (diethoxymethylsilyl) propylamine.
8. The method for preparing a dry-mixed plastering mortar using recycled aggregate according to claim 1, wherein the portland cement is one or a mixed cement of ordinary portland cement and slag portland cement; the fly ash is first-grade fly ash or second-grade fly ash.
9. The method for preparing a dry-mixed plastering mortar using recycled aggregate according to claim 1, wherein the water retaining agent is one or more of Methylcellulose (MC), Hydroxyethylcellulose (HEC), Hydroxyethylmethylcellulose (HEMC) and Hydroxypropylmethylcellulose (HPMC).
10. A dry-mixed plastering mortar prepared by using recycled aggregate, wherein the dry-mixed plastering mortar is prepared by the method of any one of claims 1 to 9.
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