CN111410478A - Composite graphene high-strength building waste cement mortar and preparation method thereof - Google Patents
Composite graphene high-strength building waste cement mortar and preparation method thereof Download PDFInfo
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- CN111410478A CN111410478A CN202010235711.2A CN202010235711A CN111410478A CN 111410478 A CN111410478 A CN 111410478A CN 202010235711 A CN202010235711 A CN 202010235711A CN 111410478 A CN111410478 A CN 111410478A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2111/29—Frost-thaw resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Ceramic Engineering (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a composite graphene high-strength construction waste cement mortar and a preparation method thereof. The performance indexes of the cement mortar obtained by the invention meet the following requirements: the standard compression strength of 28 days is 57.6MPa, the breaking strength is 9.03MPa (tested according to GB/T17617-1999 and JGJ/T70-2009); the quality and the strength loss of 150 times of anti-freezing circulation are less than 5 percent (tested according to GB/T50476-2008); cl in the product‑The content is 0.0067 percent and IRa＝0.08、Ir0.15 (test according to GB 6566-2010).
Description
Technical Field
The invention belongs to the field of novel environment-friendly building materials, and particularly relates to composite graphene high-strength building waste cement mortar and a preparation method thereof.
Background
The demand of urbanization construction on building materials is increased, natural resources face scarcity, as the mining depth is deepened, accident rate is increased due to mountain digging and stone taking, and the health of workers and the smooth operation of mining work are seriously influenced. The urbanization process is accelerated continuously, and a large amount of construction waste is generated in the removal of old buildings, the reconstruction of houses and the construction of new buildings. The quantity of construction waste which is continuously increased nowadays reaches 30% -40% of that of urban waste, and the utilization rate of the construction waste in China is less than 5%. If a large amount of construction waste can not be reasonably applied and treated for a long time, the accumulated construction waste occupies a large amount of land, and damages the soil structure, so that the ground surface settlement is caused, and the quality of air and water is influenced. On the other hand, cement-based materials occupy a leading position in the building industry of China, and the use amount of sand and stone is increased year by year. However, sand and stone are short-term non-renewable resources, and a large amount of river sand mining can cause the river bed to be seriously collapsed, so that flood can easily overflow the dike; mountain-opening and stone-taking seriously affect the ecological environment of China and the health of workers, so that the accident rate is increased and the production efficiency is reduced. The resource production of the building garbage recycled aggregate is an important way for improving the utilization rate of the building garbage, reducing the exploitation of natural resources and protecting the ecological environment. In addition, the mortar prepared by using the building reclaimed sand at present has low strength, most products only reach about 30MPa, and the mortar cannot be widely applied as a building main body material.
At present, the resource utilization of the construction waste is mainly in the aspect of coarse aggregate, and the research on the regeneration of the fine aggregate from the construction waste is only limited to the laboratory stage. The recycled fine aggregate has many inevitable defects, such as high component uncertainty and apparent density, high bulk density, high water absorption, high crushing index and a large amount of microcracks on the surface, which cause the difficulty of applying the recycled fine aggregate to the concrete industry. Therefore, the resource utilization approach of the construction waste is greatly concerned.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide the composite graphene high-strength construction waste cement mortar which is waste-utilizing, environment-friendly and energy-saving and the preparation method thereof.
In order to realize the purpose of the invention, the following technical scheme is adopted:
the utility model provides a compound graphite alkene high strength construction waste cement mortar which characterized in that: the cement mortar comprises the following raw materials in parts by weight:
mixing water 12 parts;
22 parts of cement;
19.8 parts of recycled fine aggregate;
46.2 parts of standard sand;
the graphene oxide accounts for 0.02% of the total amount of the cement;
the polycarboxylic acid water reducing agent accounts for 0.02 percent of the total amount of the cement.
The recycled fine aggregate is particles with the particle size of 10-60 meshes obtained by crushing and screening construction waste.
Further, the cement is 42.5-grade ordinary portland cement.
The product of the invention takes cement as a basic inorganic cementing material, regenerated fine aggregate and standard sand as a skeleton structure, GO as a reinforcing agent and a surfactant, and a polycarboxylic acid water reducing agent is used for promoting the further dispersion of graphene oxide, reducing the water consumption and enhancing the water retention performance. The traditional cement mortar composite material is doped with construction waste, so that the strength is reduced, the fluidity loss is serious, and phenomena such as hollowing, sanding, cracks and the like occur in hardened set cement, so that the application of the construction waste in the engineering field cannot be met. According to the invention, GO is added into the cement mortar, so that the bonding force between the mortars is obviously improved through the electrostatic action, the frictional resistance between the recycled cement-based composite materials is reduced, the fluidity is improved, and the possibility is provided for the application of the recycled cement mortar composite materials. Ordinary cement can generate a series of complex hydration reactions when meeting water, and mainly generates hydration products such as AFt, AFm, CH, C-S-H and the like. AFt, AFm and CH mainly exhibit disordered needle, rod and sheet polyhedral crystals, whereas C-S-H is generally fibrous, widely and non-uniformly distributed, and difficult to form regular crystals and microstructures. After GO is doped, a large number of rod-shaped crystals are clustered together, are densely distributed, have regular and compact structures, are filled in gaps, reduce the porosity, have a regulating effect on cement hydration, and finally form a large-scale orderly micro-morphology compact system.
The preparation method of the composite graphene high-strength construction waste cement mortar comprises the following steps:
step 1, weighing raw materials according to a ratio;
step 3, adding a small amount of mixing water into the graphene oxide, and performing ultrasonic dispersion uniformly; then adding cement, a polycarboxylic acid water reducing agent and the rest of mixing water, and uniformly mixing and stirring to obtain a mixture B;
and 4, fully stirring the mixture A and the mixture B, and uniformly mixing to obtain the composite graphene high-strength construction waste cement mortar. The obtained cement mortar can be prepared into building blocks, can be directly used as plastering mortar during masonry, and can be constructed according to a standard cement mortar method.
Further, in the step 3, the temperature of the ultrasonic wave is not higher than 40 ℃, and the ultrasonic power is 500W.
The invention has the beneficial effects that:
1. the performance indexes of the cement mortar of the invention meet: the bending strength reaches 6.82MPa in seven days, the compressive strength reaches 39.5MPa, the standard compressive strength of 28 days is 57.6MPa, and the bending strength is 9.03MPa, so that the high-strength standard of JGJ/T70-2009 'basic performance test method for building mortar' and GB/T17617-1999 'cement mortar strength test method' is met; the 150 times of frost resistance circulation quality and strength loss are less than 5 percent, and the weather resistance is good; the fluidity reaches 189mm, the construction is simple and convenient, and the comprehensive cost is low; cl in the product-The content is 0.0067%, which is far less than the national standard specified value (0.06%) of JGJ/T322-2013, and the method is suitable for being applied to various reinforced concrete construction fields; i isRa＝0.08、Ir0.15, meets the standard regulation of GB6566-2010 radionuclide limit of building materials, belongs to A-class decorative materials, and is suitable for indoor useIn the aspect of wall plastering mortar, the mortar has excellent environmental protection performance and can be used in construction in any space field.
2. The graphene is used as a modifier, the high brittleness of a complex body which cannot be solved by adding common nano materials into common cement-based materials is overcome, the GO is used as a surfactant and also used as a catalyst for hydrating cement mortar, the strength of the cement mortar composite material is improved, the expansion of microcracks is prevented, the workability is improved, the bleeding phenomenon is avoided, the age strength is fundamentally improved, the comprehensive durability of the cement-based materials is improved, and the toughness of the cement-based materials is also improved.
3. The invention utilizes waste, adopts the recycled fine aggregate of the construction waste as the filling aggregate, adopts 30 percent of the aggregate from the construction waste, not only saves energy, protects cultivated land and reduces pollution, but also promotes the sustainable development of the construction industry, is a successful practice for improving and expanding the functions of the construction materials, and has significant social and economic benefits.
4. The composite graphene high-strength building waste cement mortar material disclosed by the invention is simple in production process, easy to operate and simple and cheap in production equipment.
Drawings
FIG. 1 is a flow chart of a preparation process of the composite graphene high-strength construction waste cement mortar of the invention;
FIG. 2 is an XRD pattern of age samples of a cement mortar product containing graphene and a cement mortar product not containing graphene according to the present invention;
FIG. 3 is a graph of thermal analysis curves of a cement mortar product containing graphene and a cement mortar product not containing graphene according to the present invention;
fig. 4 is a scanning electron microscope picture of age hydration products of the cement mortar product containing graphene and the cement mortar product not containing graphene, wherein: (a) curing for 7 days of cement mortar not containing GO, (b) curing for 7 days of cement mortar containing 0.02% GO, (c) curing for 28 days of cement mortar not containing GO, and (d) curing for 28 days of cement mortar containing 0.02% GO.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The invention adopts the construction waste as the raw material, utilizes the roller crusher to crush the construction waste, screens the fine particles between 10 meshes and 60 meshes as the recycled fine aggregate, realizes the recycling of resources and changes waste into valuable. The physical properties of the recycled fine aggregate obtained are shown in Table 1.
TABLE 1
The physicochemical properties of graphene oxide GO used in this example are shown in table 2.
TABLE 2
The composite graphene high-strength building rubbish cement mortar of the embodiment comprises the following raw materials in parts by weight:
mixing water 12 parts;
22 parts of 42.5-grade ordinary portland cement;
19.8 parts of recycled fine aggregate;
46.2 parts of standard sand;
the graphene oxide accounts for 0.02% of the total amount of the cement;
the polycarboxylic acid water reducing agent accounts for 0.02 percent of the total amount of the cement.
As shown in fig. 1, the preparation process is as follows:
step 1, weighing raw materials according to a ratio;
step 3, adding a small amount of mixing water into the graphene oxide, and uniformly dispersing by using ultrasonic, wherein the ultrasonic temperature is not higher than 40 ℃ and the ultrasonic power is 500W; then adding cement, a polycarboxylic acid water reducing agent and the rest of mixing water, mixing and stirring uniformly at a stirring speed of 62r/min to obtain a mixture B;
and 4, fully stirring the mixture A and the mixture B (firstly stirring at a low speed of 62r/min, and then stirring at a high speed of 125 r/min), and uniformly mixing to obtain the composite graphene high-strength construction waste cement mortar.
The physical property detection and result analysis of the product of the invention are as follows:
the construction operation is carried out according to the preparation process of the composite graphene high-strength building rubbish cement mortar material, the workability of the cement mortar material is tested firstly, then a sample with the size of 40mm × 40mm × 160mm is manufactured, and the sample is used for testing the performances of the fracture and compression strength, the weather resistance, the freezing resistance and the like after standard age maintenance.
The invention selects 42.5-grade ordinary portland cement in the traditional building materials, takes recycled fine aggregate and standard sand as aggregate, and GO as a reinforcing agent and a surfactant, and aims to obtain a high-strength environment-friendly building material. Therefore, the strength and environmental performance test is a main investigation project, and other projects can be used as reference.
(1) Flexural strength and compressive strength of composite graphene high-strength building waste cement mortar material
The flexural and compressive strength of the cement mortar material is tested according to GB/T17617-1999 Cement mortar Strength test method and JGJ/T70-2009 building mortar basic Performance test method. Curing for 28 days, wherein the flexural strength and the compressive strength of the cement mortar material respectively reach 9.03MPa and 57.6 MPa. Compared with the national standard, the product is respectively improved by 38.9 percent and 35.5 percent.
(2) Fluidity of composite graphene high-strength building waste cement mortar material
The mortar fluidity reflects the friction between the cement paste and the sand and the degree of thickening of the mixture. If the mortar mixture is too dry and thick, the fluidity is poor, and the mortar mixture is difficult to implement and utilize in the field of buildings; if the mixture is too thin, the fluidity is good, but the phenomenon of layering and segregation is easy to occur, which is not beneficial to improving the later strength. The recycled fine aggregate used in the invention is obtained by crushing the original construction waste, a large amount of microcracks exist on the surface, the water absorption rate is larger, however, the negatively charged GO can play the role of an anionic surfactant, the frictional resistance is reduced, and the workability of mortar is improved. The fluidity of the composite graphene high-strength construction waste cement mortar material is measured according to GB/T2419-2005, is about 189mm, is good, and meets the national standard.
(3) Composite graphene high-strength building waste cement mortar material with frost resistance and weather resistance
The frost resistance and the weather resistance of the cement mortar material are important indexes for determining the service life of the material in severe cold, slightly frozen and other areas. The traditional cement-based composite material is easy to fall off micro particles on the surface of mortar and cause stress strain in the internal gaps of the material in the anti-freezing circulation process, so that the strength is reduced and the service life is greatly reduced. The existing recycled cement-based composite materials generally used in the market usually ignore the influence of environmental temperature, humidity, climate change and the like on the strength and structure of the recycled cement-based composite materials, so that the structure of a plurality of recycled cement-based composite materials does not reach the initial design service life, the phenomena of aggregate degradation and peeling, internal structure cracking and the like occur, and the performance and the appearance image of the structure of a building structure are seriously influenced.
The product of the invention has less than 5% of mass loss and strength loss in the process of 150 times of anti-freezing circulation tests. The test block is put into an ultraviolet light weather-proof test box to simulate ultraviolet light, spraying, humidity and condensation to be respectively treated for 16h, and the circulation lasts for three weeks, wherein the mass loss and the strength loss are both less than 5 percent, and the test block meets the standard requirements in national standard GB/T50476-2008 'concrete structure durability design standard'.
(4)Cl-Analysis of assay and radioactivity results
The high-concentration chloride ions can aggravate the corrosion of the steel bars and accelerate the corrosion rate of the steel bars, so that the durability of the reinforced concrete structure is reduced. Whether the recycled composite graphene high-strength construction waste cement mortar can be applied to the design rule of reinforced concrete or not and Cl is added to the recycled composite graphene high-strength construction waste cement mortar-On the other hand, some materials prepared synthetically at present contain natural radioactive nuclide, which can emit α and gamma rays to cause harm to human body-The content is less than 0.0067%, and the internal and external irradiation index I of the materialRa≤1.0、IrLess than or equal to 1.3, meets the standard of A-class decorative materials, meets the standard regulation of GB6566-2010 radionuclide limit of building materials, and can be applied to building structuresAny internal and external surfaces of the building body do not have any harm to human body.
The standard age microscopic performance analysis of the product of the invention takes a sample without GO as a comparison, and the formula and the preparation process of the product are the same as those of the product containing GO, and the difference is that the product does not contain GO:
(1) x-ray diffraction analysis of composite graphene high-strength building waste cement mortar material
The product material of the present invention was sampled and subjected to X-ray diffraction analysis as shown in fig. 2. Fig. 2 analysis shows that: the peak values are better when 2 theta is 18 degrees, 34.5 degrees and 29 degrees, and the peak value can be further improved by adding GO. The result shows that GO is doped without obvious extra peaks, the positions and the shapes of absorption peaks are similar, cement hydration products are all composed of CH, C-S-H, AFt and the like, wherein the absorption peaks of CH and C-S-H, AFt in the GO-doped cement-based composite material are strong, which indicates that GO can regulate and control the crystal form and the quantity of the cement hydration products, but no new crystal appears, and indicates that GO plays a role of a catalyst in the cement hydration process.
(2) Microcosmic thermal mechanical analysis for preparation of composite graphene high-strength construction waste cement mortar material
The product of the present invention was subjected to a micro-thermomechanical analysis of the age hydration product, as shown in figure 3.
TG image shows that along with temperature rise, the sample gradually loses weight, and the high-strength construction waste cement mortar material added with GO has the largest quality loss. Analysis according to the DTG curve shows that: three obvious weight loss platforms are provided, the reaction rate is fastest at 102.719 ℃, 445.522 ℃ and 725.047 ℃, and the weight loss is most obvious.
The DTA images show that the peak of the exotherm occurs at the same temperature point, indicating that the corresponding sample exothermically is the most at this temperature. Analysis shows that: the interlayer water is removed from the room temperature to 105 ℃ mainly by the evaporation of free water and C-S-H, hydration products such as C-S-H, hydrated calcium aluminate, AFm and the like are dehydrated and decomposed before 300 ℃, calcium hydroxide is decomposed at 400 to 550 ℃, and carbonate is decomposed at more than 600 ℃. The regenerated cement mortar composite material containing GO has the largest mass loss, namely the reaction rate at the temperature point is higher, and the more substances are subjected to hydration reaction along with the increase of the ambient temperature. And no obvious additional peak value is found in a specific heat analysis curve, which indicates that the addition of GO does not generate additional hydration products, only promotes the generation of the original hydration products, and plays a role in catalyzing the hydration of cement.
(3) Scanning electron microscope analysis of composite graphene high-strength building waste cement mortar material
The product of the invention was sampled and analyzed by scanning electron microscopy on age sample hydration products as shown in fig. 4.
From a comparative analysis of FIGS. 4(a) and 4(b) it can be seen that: the cement stone which is 7 days of hydration age and does not contain GO has smaller needle-like crystals, is not regularly arranged and is scattered, and has larger cracks; a large amount of rod-shaped crystals generated by the GO-doped product are clustered together, the structure is regular and compact, and the rod-shaped crystals are filled in gaps, so that the GO has a regulation and control effect on early hydration products of the product, and a large-scale and regular micro-morphology is formed. After the product is maintained for 28 days, a large amount of rod-shaped crystals are found, the structure is loose, and gaps and cracks still exist (see figure 4 (c)); hydration of the product containing GO produced a large number of needle-like crystals, densely distributed and crossing each other, largely filling the gaps (see fig. 4 (d)). Analysis shows that: GO has a template effect on hydration of products in the age period, and can promote needle-rod-shaped crystals to be reassembled into a compact structure body, so that the comprehensive performance of the construction waste cement mortar material is improved.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. The utility model provides a compound graphite alkene high strength construction waste cement mortar which characterized in that: the cement mortar comprises the following raw materials in parts by weight:
mixing water 12 parts;
22 parts of cement;
19.8 parts of recycled fine aggregate;
46.2 parts of standard sand;
the graphene oxide accounts for 0.02% of the total amount of the cement;
the polycarboxylic acid water reducing agent accounts for 0.02 percent of the total amount of the cement;
the recycled fine aggregate is particles with the particle size of 10-60 meshes obtained by crushing and screening construction waste.
2. The composite graphene high-strength construction waste cement mortar as claimed in claim, is characterized in that: the cement is 42.5-grade ordinary portland cement.
3. The preparation method of the composite graphene high-strength construction waste cement mortar disclosed by claim 1 is characterized by comprising the following steps of:
step 1, weighing raw materials according to a ratio;
step 2, uniformly mixing the recycled fine aggregate and the standard sand to obtain a mixture A;
step 3, adding a small amount of mixing water into the graphene oxide, and performing ultrasonic dispersion uniformly; then adding cement, a polycarboxylic acid water reducing agent and the rest of mixing water, and uniformly mixing and stirring to obtain a mixture B;
and 4, fully stirring the mixture A and the mixture B, and uniformly mixing to obtain the composite graphene high-strength construction waste cement mortar.
4. The production method according to claim 3, characterized in that: in the step 3, the temperature of the ultrasound is not higher than 40 ℃, and the ultrasound power is 500W.
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| CN112500091A (en) * | 2021-01-22 | 2021-03-16 | 湘潭大学 | Chloride ion permeation resistant mortar for ocean engineering and preparation method thereof |
| CN113277820A (en) * | 2021-06-20 | 2021-08-20 | 华北理工大学 | Graphene oxide reinforced solid waste concrete and preparation method thereof |
| CN114085058A (en) * | 2021-11-03 | 2022-02-25 | 深圳大学 | Graphene oxide composite cement-based cementing material with high chloride ion curing capacity and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114085058A (en) * | 2021-11-03 | 2022-02-25 | 深圳大学 | Graphene oxide composite cement-based cementing material with high chloride ion curing capacity and preparation method thereof |
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