CN112608114A - Dry-mixed waterproof mortar prepared from recycled aggregate and preparation method thereof - Google Patents
Dry-mixed waterproof mortar prepared from recycled aggregate and preparation method thereof Download PDFInfo
- Publication number
- CN112608114A CN112608114A CN202010737399.7A CN202010737399A CN112608114A CN 112608114 A CN112608114 A CN 112608114A CN 202010737399 A CN202010737399 A CN 202010737399A CN 112608114 A CN112608114 A CN 112608114A
- Authority
- CN
- China
- Prior art keywords
- fine aggregate
- dry
- recycled
- waterproof mortar
- aggregate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C04B28/06—Aluminous 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
-
- 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
- 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
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
- C04B20/1085—Waterglass
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides dry-mixed waterproof 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 ordinary portland cement, the quick-hardening sulphoaluminate cement, the modified recycled fine aggregate, the redispersible latex powder, the hydroxypropyl methylcellulose and the organic silicon water repellent according to the parts by weight, and uniformly mixing to obtain the dry-mixed waterproof mortar. According to the technical scheme, the recycled fine aggregate is modified, so that the comprehensive performance of the obtained modified recycled fine aggregate dry-mixed waterproof mortar is greatly improved, the modified recycled fine aggregate dry-mixed waterproof mortar has the same or even slightly excellent performance with the natural river sand dry-mixed waterproof mortar, the resource utilization of the building garbage is realized, and the waste is changed into valuable.
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 waterproof 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, a method for effectively activating and strengthening recycled aggregate is urgently needed to be provided, so that the recycled aggregate can be applied to dry-mixed waterproof mortar instead of natural sand.
Disclosure of Invention
The invention aims to provide a method for preparing dry-mixed waterproof 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 waterproof 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 0.08-2.3 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 waterproof mortar:
weighing and uniformly mixing ordinary portland cement, quick-hardening sulphoaluminate cement, modified recycled fine aggregate, redispersible latex powder, hydroxypropyl methylcellulose and an organic silicon water repellent according to the weight parts to obtain the dry-mixed waterproof 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 ordinary portland cement, the quick-hardening sulphoaluminate cement, the modified recycled fine aggregate, the redispersible latex powder, the hydroxypropyl methyl cellulose and the organic silicon water repellent is 300-400: 25-50: 500-650: 40-50: 1-2: 2-3.
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 invention, the coupling agent is one or more of 3-thiocyanatopropyltriethoxysilane, 3-chloropropylmethyldimethoxysilane, diethylenetriaminopropyltrimethoxysilane and isopropoxytris (ethylenediamine-N-ethoxy) titanate.
In a preferred embodiment of the invention, the redispersible latex powder is one or more of polyethylene vinyl acetate, polyvinyl acetate-vinyl versatate, polystyrene-acrylate, and polyacrylate.
In a second aspect of the invention, a dry-mixed waterproof mortar prepared by using recycled aggregate is provided, and the dry-mixed waterproof 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 construction waste, so that the recycled aggregate can replace natural sand to be applied to dry-mixed waterproof mortar, and the resource utilization of the construction waste 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 0.08-2.3 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) According to the technical scheme, 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) In the technical scheme, after the redispersible rubber powder is added, the polymer particles are attached to a cement hydration product and filled in the inner pores of the mortar. Both the cement and the redispersible gelatine powder have the function of a binding material, the former forming a hydrated product by chemical reaction with the water used for mixing, the latter acting by film formation during drying. Along with the cement hydration and the polymer film forming process, the cement hydration product and the polymer form a mutually interlaced space network film structure, so that the mortar has a certain connection effect, the bonding between the cement hydration product and the aggregate is improved, the cracking of the mortar is slowed down, and the cracking resistance, the toughness, the breaking strength and the impermeability of the mortar are improved.
(6) In the technical scheme, the organic silicon water repellent is added, and the penetration crystallinity of the organic silicon water repellent is utilized to greatly reduce the water absorption of the cement-based material and the penetration force of the surface of the mortar and capillary tubes, so that the anti-corrosion capability of the mortar is improved.
Detailed Description
The following is a detailed description of a method for preparing a dry-mixed waterproof mortar using recycled aggregate according to the first aspect of the present invention, and a dry-mixed waterproof mortar using recycled aggregate according to the second aspect of the present invention.
First, a method for preparing a dry-mixed waterproof mortar using recycled aggregate according to a 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 0.08-2.3 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 waterproof mortar:
weighing and uniformly mixing ordinary portland cement, quick-hardening sulphoaluminate cement, modified recycled fine aggregate, redispersible latex powder, hydroxypropyl methylcellulose and an organic silicon water repellent according to the weight parts to obtain the dry-mixed waterproof 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 0.08-2.3 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 regenerated fine aggregate, and play a role in filling the pores of the regenerated fine aggregate, bonding the cracks of the regenerated aggregate, toughening and reinforcing and inhibiting crack expansion, so that the problems that the pores of the regenerated fine aggregate are slightly cracked after the aggregate is stressed in the regeneration and crushing process are solvedThe problems of low strength, high porosity, large water absorption and poor impermeability of the recycled fine aggregate are caused by the grains, so that the performance of the recycled fine aggregate is improved.
In addition, in the technical scheme, after the redispersible rubber powder is added, the polymer particles can be attached to the cement hydration product and filled in the internal pores of the mortar. Both the cement and the redispersible gelatine powder have the function of a binding material, the former forming a hydrated product by chemical reaction with the water used for mixing, the latter acting by film formation during drying. Along with the cement hydration and the polymer film forming process, the cement hydration product and the polymer form a mutually interlaced space network film structure, so that the mortar has a certain connection effect, the bonding between the cement hydration product and the aggregate is improved, the cracking of the mortar is slowed down, and the cracking resistance, the toughness, the breaking strength and the impermeability of the mortar are improved. In the technical scheme, the organic silicon water repellent is also added, and the water absorption of the cement-based material and the permeability of the surface of the mortar and capillary tubes are greatly reduced by utilizing the penetration crystallinity of the organic silicon water repellent, so that the anti-corrosion capability of the mortar 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 ordinary portland cement, the quick-hardening sulphoaluminate cement, the modified recycled fine aggregate, the redispersible latex powder, the hydroxypropyl methyl cellulose and the organic silicon water repellent is 300-400: 25-50: 500-650: 40-50: 1-2: 2-3.
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 invention, the coupling agent is one or more of 3-thiocyanatopropyltriethoxysilane, 3-chloropropylmethyldimethoxysilane, diethylenetriaminopropyltrimethoxysilane and isopropoxytris (ethylenediamine-N-ethoxy) titanate.
In a preferred embodiment of the invention, the redispersible latex powder is one or more of polyethylene vinyl acetate, polyvinyl acetate-vinyl versatate, polystyrene-acrylate, and polyacrylate.
Next, a dry-mixed waterproof mortar prepared using a recycled aggregate according to a 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 exploration of production practice of the inventor, when the preparation process for preparing the dry-mixed waterproof 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 waterproof mortar prepared by the method of the first aspect of the invention meet the requirements in JC/T984 plus 2011 Polymer Cement waterproof mortar, and partial performances of the dry-mixed waterproof mortar are even better than those of the dry-mixed waterproof 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 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 waterproofing mortar RDWS-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 0.08-2.3 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 3-thiocyano propyl triethoxysilane as coupling agent in absolute ethanol to obtain alcohol solution of the coupling agent, wherein the mass ratio of the coupling agent to the absolute ethanol 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 waterproof mortar
Weighing 300 parts of ordinary portland cement (P.O 42.5.5), 50 parts of quick-hardening sulphoaluminate cement, 602 parts of modified recycled fine aggregate (MRFA-1), 45 parts of polyethylene vinyl acetate, 1 part of hydroxypropyl methyl cellulose and 2 parts of organic silicon water repellent according to parts by weight, and uniformly mixing to prepare the recycled fine aggregate dry-mixed waterproof mortar RDWS-1.
EXAMPLE 2 preparation of Dry-mix waterproofing mortar RDWS-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 0.08-2.3 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 3-chloropropylmethyldimethoxysilane 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 waterproof mortar
Weighing 320 parts of ordinary portland cement (P.O 42.5.5), 40 parts of quick-hardening sulphoaluminate cement, 588 parts of modified recycled fine aggregate (MRFA-2), 48 parts of polyvinyl acetate-vinyl versatate, 1.5 parts of hydroxypropyl methyl cellulose and 2.2 parts of organosilicon water repellent according to the parts by weight, and uniformly mixing to prepare the recycled fine aggregate dry-mixed waterproof mortar RDWS-2.
EXAMPLE 3 preparation of Dry-mix waterproofing mortar RDWS-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 0.08-2.3 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 of diethylenetriaminopropyltrimethoxysilane 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 waterproof mortar
350 parts of ordinary portland cement (P.O 42.5.5), 30 parts of quick-hardening sulphoaluminate cement, 566 parts of modified recycled fine aggregate (MRFA-3), 50 parts of polystyrene-acrylate, 1.8 parts of hydroxypropyl methyl cellulose and 2.5 parts of organosilicon water repellent are weighed according to the parts by weight and mixed evenly to prepare the recycled fine aggregate dry-mixed waterproof mortar RDWS-3.
EXAMPLE 4 preparation of Dry-mix waterproofing mortar RDWS-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 0.08-2.3 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 coupling agent isopropoxy tri (ethylenediamine-N-ethoxy) titanate in absolute ethyl alcohol to prepare coupling agent alcohol solution, wherein the mass ratio of the coupling agent to the absolute ethyl alcohol 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 waterproof mortar
Weighing 400 parts of ordinary portland cement (P.O 42.5.5), 25 parts of quick-hardening sulphoaluminate cement, 530 parts of modified recycled fine aggregate (MRFA-4), 40 parts of polyacrylate, 2 parts of hydroxypropyl methyl cellulose and 3 parts of organic silicon water repellent according to parts by weight, and uniformly mixing to prepare the recycled fine aggregate dry-mixed waterproof mortar RDWS-4.
Comparative examples 1 to 4
The modified recycled fine aggregates MRFA-1 to MRFA-4 of the dry-mixed waterproof mortar in examples 1 to 4 were replaced with natural river sand to prepare corresponding comparative examples NDWS-1 to NDWS-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 waterproof mortar UDWS-1 to UDWS-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 the performance of the recycled fine aggregate is obviously improved. 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 waterproof mortar.
The dry-mixed waterproof mortar prepared in examples 1 to 4 (RDWS-1, RDWS-2, RDWS-3 and RDWS-4), the dry-mixed waterproof mortar prepared in comparative examples 1 to 4 (NDWS-1, NDWS-2, NDWS-3 and NDWS-4) and the dry-mixed waterproof mortar prepared in comparative examples 5 to 8 (UDWS-1, UDWS-2, UDWS-3 and UDWS-4) were respectively subjected to performance tests according to the standard of JC/T984-:
TABLE 2 comparison of Dry-Mixed waterproof mortar Properties
TABLE 3 comparison of Dry-Mixed waterproof mortar Properties
From the test results in tables 2 and 3, it can be seen that, compared with the dry-mixed waterproof mortars UDWS-1 to UDWS-4 prepared by using the unmodified recycled fine aggregates 1 to 4 in the comparative examples 5 to 8, the dry-mixed waterproof mortars RDWS-1 to RDWS-4 prepared by using the modified recycled fine aggregates in the examples 1 to 4 have compressive strength improved by about 60%, flexural strength improved by about 100%, 7d seepage resistance improved by about 100%, 28d seepage resistance improved by about 80%, 7d bonding strength improved by about 200%, 28d bonding strength improved by about 180%, flexibility improved by about 110%, shrinkage reduced by about 80%, and water absorption reduced by about 70%. In addition, the dry-mixed waterproof mortar RDWS-1 to RDWS-4 prepared by adopting the modified recycled fine aggregate in the examples 1 to 4 have no cracking and peeling phenomena in the aspects of alkali resistance, heat resistance and frost resistance; the dry-mixed waterproof mortars (UDWS-1, UDWS-2, UDWS-3 and UDWS-4) prepared in comparative examples 5 to 8 all showed the occurrence of microcracks and peeling.
Compared with the dry-mixed waterproof mortar NDWS-1-NDWS-4 prepared by adopting the natural river sand in the comparative examples 1-4, the dry-mixed waterproof mortar RDWS-1-RDWS-4 prepared by adopting the modified recycled fine aggregate in the examples 1-4 has no cracking and peeling phenomena in the aspects of alkali resistance, heat resistance and freezing resistance; and in the aspects of compressive strength, breaking strength, bonding strength, flexibility, shrinkage rate and water absorption, the RDWS-1 to RDWS-4 are slightly superior to the corresponding comparative examples NDWS-1 to NDWS-4, which shows that the modified recycled fine aggregate can completely replace natural river sand, and the comprehensive performance is slightly improved.
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 (9)
1. A method for preparing dry-mixed waterproof mortar by utilizing 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 0.08-2.3 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 waterproof mortar:
weighing and uniformly mixing ordinary portland cement, quick-hardening sulphoaluminate cement, modified recycled fine aggregate, redispersible latex powder, hydroxypropyl methylcellulose and an organic silicon water repellent according to the weight parts to obtain the dry-mixed waterproof mortar.
2. The method for preparing the dry-mixed waterproof mortar by using the recycled aggregate according to claim 1, wherein the mass ratio of the polyether polyol to the sodium silicate to the water is 0.5-2: 3-5: 100.
3. The method for preparing the dry-mixed waterproof 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 waterproof mortar by using the recycled aggregate according to claim 1, wherein the mass ratio of the ordinary portland cement, the quick-hardening sulphoaluminate cement, the modified recycled fine aggregate, the redispersible latex powder, the hydroxypropyl methyl cellulose and the organic silicon water repellent is 300-400: 25-50: 500-650: 40-50: 1-2: 2-3.
5. The method for preparing dry-mixed waterproof mortar by using recycled aggregate according to claim 1, wherein the construction waste is one or more of construction waste concrete, waste masonry, broken stone, broken brick and tile and waste mortar.
6. The method for preparing the dry-mixed waterproof 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 dry-mixed waterproof mortar by using recycled aggregate according to claim 1, wherein the coupling agent is one or more of 3-thiocyanatopropyltriethoxysilane, 3-chloropropylmethyldimethoxysilane, diethylenetriaminopropyltrimethoxysilane and isopropoxytris (ethylenediamine-N-ethoxy) titanate.
8. The method for preparing dry-mixed waterproof mortar by using recycled aggregate according to claim 1, wherein the redispersible latex powder is one or more of polyethylene vinyl acetate, polyethylene vinyl acetate-versatate, polystyrene-acrylate and polyacrylate.
9. A dry-mixed waterproof mortar prepared by using recycled aggregate, which is characterized by being prepared by the method of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010737399.7A CN112608114A (en) | 2020-07-28 | 2020-07-28 | Dry-mixed waterproof mortar prepared from recycled aggregate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010737399.7A CN112608114A (en) | 2020-07-28 | 2020-07-28 | Dry-mixed waterproof mortar prepared from recycled aggregate and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112608114A true CN112608114A (en) | 2021-04-06 |
Family
ID=75224425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010737399.7A Pending CN112608114A (en) | 2020-07-28 | 2020-07-28 | Dry-mixed waterproof mortar prepared from recycled aggregate and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112608114A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860813A (en) * | 2021-09-13 | 2021-12-31 | 南京交通工程有限公司 | Recycled concrete adopting expansive soil modifier |
| CN115974501A (en) * | 2022-12-26 | 2023-04-18 | 厦门天润锦龙建材有限公司 | Dry-mixed waterproof mortar and preparation method thereof |
| CN116553876A (en) * | 2023-06-01 | 2023-08-08 | 中建新城建设工程有限公司 | Energy-saving green building material and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007562A (en) * | 2016-05-19 | 2016-10-12 | 四川震强绿舍建材有限公司 | Dry-mixed mortar prepared from construction waste recycled aggregate and preparation method of dry-mixed mortar |
| CN107140903A (en) * | 2017-04-21 | 2017-09-08 | 张静 | A kind of preparation method of regenerated aggregate concrete |
| CN110526610A (en) * | 2019-08-13 | 2019-12-03 | 温州市三箭混凝土有限公司 | A kind of High Strength Regenerated Concrete and preparation method thereof |
| CN111268931A (en) * | 2020-03-20 | 2020-06-12 | 佛山市南海承骏科技有限公司 | Preparation method of recycled aggregate and dry-mixed mortar |
| CN111423193A (en) * | 2020-03-20 | 2020-07-17 | 浙江忠信新型建材股份有限公司 | Quick-hardening polymer cement waterproof mortar with low water absorption and preparation method thereof |
-
2020
- 2020-07-28 CN CN202010737399.7A patent/CN112608114A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007562A (en) * | 2016-05-19 | 2016-10-12 | 四川震强绿舍建材有限公司 | Dry-mixed mortar prepared from construction waste recycled aggregate and preparation method of dry-mixed mortar |
| CN107140903A (en) * | 2017-04-21 | 2017-09-08 | 张静 | A kind of preparation method of regenerated aggregate concrete |
| CN110526610A (en) * | 2019-08-13 | 2019-12-03 | 温州市三箭混凝土有限公司 | A kind of High Strength Regenerated Concrete and preparation method thereof |
| CN111268931A (en) * | 2020-03-20 | 2020-06-12 | 佛山市南海承骏科技有限公司 | Preparation method of recycled aggregate and dry-mixed mortar |
| CN111423193A (en) * | 2020-03-20 | 2020-07-17 | 浙江忠信新型建材股份有限公司 | Quick-hardening polymer cement waterproof mortar with low water absorption and preparation method thereof |
Non-Patent Citations (7)
| Title |
|---|
| 于守武等: "《高分子材料改性-原理及技术》", 31 May 2015 * |
| 何培之: "《高等教育机械类自学考试教材 普通化学》", 31 August 1984 * |
| 姜越川: "再生骨料改性处理研究", 《混凝土》 * |
| 张旭之等: "《丙烯衍生物工学》", 31 May 1995 * |
| 朱坤学等: "建筑废弃物再生粗骨料表面改性试验研究", 《建筑节能》 * |
| 杨帆: "《建筑材料》", 31 July 2017 * |
| 韩岚岚等: "建筑垃圾骨料强化改性方法研究", 《四川建材》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860813A (en) * | 2021-09-13 | 2021-12-31 | 南京交通工程有限公司 | Recycled concrete adopting expansive soil modifier |
| CN113860813B (en) * | 2021-09-13 | 2022-11-29 | 南京交通工程有限公司 | Recycled concrete adopting expansive soil modifier |
| CN115974501A (en) * | 2022-12-26 | 2023-04-18 | 厦门天润锦龙建材有限公司 | Dry-mixed waterproof mortar and preparation method thereof |
| CN116553876A (en) * | 2023-06-01 | 2023-08-08 | 中建新城建设工程有限公司 | Energy-saving green building material and preparation method thereof |
| CN116553876B (en) * | 2023-06-01 | 2024-01-09 | 中建新城建设工程有限公司 | Energy-saving green building material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113929390B (en) | Environment-friendly green concrete and preparation method thereof | |
| CN112608094A (en) | High-strength concrete prepared from recycled aggregate and preparation method thereof | |
| CN108793876B (en) | Pervious concrete with waste concrete as aggregate, preparation method and application thereof | |
| CN103058614B (en) | Special thin anti-crack plastering mortar for autoclaved aerated concrete | |
| CN112608114A (en) | Dry-mixed waterproof mortar prepared from recycled aggregate and preparation method thereof | |
| CN112608052A (en) | Dry-mixed masonry mortar prepared from recycled aggregate and preparation method thereof | |
| CN112608093A (en) | Dry-mixed plastering mortar prepared from recycled aggregate and preparation method thereof | |
| CN101538138B (en) | Compound insulating mortar of buildings | |
| CN108546072B (en) | Water-resistant machine-whitewashing gypsum material | |
| CN114230289B (en) | Green high-strength and high-toughness concrete and preparation process thereof | |
| CN111423193A (en) | Quick-hardening polymer cement waterproof mortar with low water absorption and preparation method thereof | |
| CN108191281B (en) | Recycled aggregate concrete interface transition zone strengthening method | |
| CN111072361A (en) | Novel phosphogypsum plastering mortar and preparation method thereof | |
| CN111253127A (en) | C30 carbon fiber broken brick recycled concrete and preparation method thereof | |
| CN115215597A (en) | Shield slag slurry alkali-activated regenerated mortar and preparation method and application thereof | |
| CN107892531A (en) | The production method of tunnel cement mortar | |
| CN113493333A (en) | Slurry-wrapped reinforced permeable recycled concrete and preparation method thereof | |
| CN114180897A (en) | Premixed mortar for green building and construction method | |
| CN113735488A (en) | Additive special for recycled concrete | |
| CN111960755A (en) | Fine concrete with dredged sand as main raw material and preparation method thereof | |
| CN107857542A (en) | The production method of cement for construction in sea wind and wave resistance mortar | |
| CN115124298B (en) | High-strength recycled aggregate concrete prepared from waste stone powder and preparation method thereof | |
| CN110590328A (en) | Foamed ceramic and preparation method thereof | |
| CN110590329A (en) | Foamed ceramic and preparation method thereof | |
| CN114573301A (en) | Preparation method of novel composite cement-based grouting material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210406 |