CN114956743A - Wet-mixed mortar containing modified recycled brick-concrete sand powder, preparation process and application - Google Patents
Wet-mixed mortar containing modified recycled brick-concrete sand powder, preparation process and application Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 90
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 87
- 239000000843 powder Substances 0.000 title claims abstract description 77
- 239000004567 concrete Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 41
- 239000011449 brick Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 24
- 239000002699 waste material Substances 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000003607 modifier Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims abstract description 6
- 239000011812 mixed powder Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 19
- 238000010276 construction Methods 0.000 claims description 13
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 239000012948 isocyanate Substances 0.000 claims description 4
- 150000002513 isocyanates Chemical class 0.000 claims description 4
- 239000004014 plasticizer Substances 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- XTIIITNXEHRMQL-UHFFFAOYSA-N tripotassium methoxy(trioxido)silane Chemical compound [K+].[K+].[K+].CO[Si]([O-])([O-])[O-] XTIIITNXEHRMQL-UHFFFAOYSA-N 0.000 claims description 3
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 8
- 239000010813 municipal solid waste Substances 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 129
- 238000000034 method Methods 0.000 description 25
- 238000012669 compression test Methods 0.000 description 15
- 239000004566 building material Substances 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000007676 flexural strength test Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003823 mortar mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 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
- C04B28/06—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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a wet-mixed mortar containing recycled brick mixed sand powder and a preparation process thereof, wherein the recycled brick mixed sand powder is prepared by mixing waste concrete and waste red brick tiles according to the same particle size and the mass ratio of 1:2 mixing the materials into a reclaimed brick sand-mixed powder material; the wet-mixed mortar material comprises, by weight, 7-10 parts of cement, 2-5 parts of fly ash, 50-70 parts of river sand, 5-20 parts of recycled brick mixed sand powder, 10-20 parts of water, 0.1-0.4 part of an additive, 0.1-0.4 part of a modifier and 0.2-0.5 part of a plastic retaining agent. The wet-mixed mortar improves the compressive strength, tensile bonding strength and flexural strength of the wet-mixed mortar, can solve the problem of building garbage accumulation, reduces the environmental pollution, conforms to the green and sustainable development concept, can save natural sandstone resources and reduce the engineering cost, and brings huge benefits for the development of economic society.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to application of modified recycled brick-concrete sand powder in wet-mixed mortar.
Background
With the rapid development of national economy and society, the living standard of people is increasingly improved, the industrialization speed is accelerated, and the urbanization speed is also increasingly accelerated. However, a large amount of construction waste generated by urban construction is always a problem in the society. The quantity of the construction waste is huge, the variety is complicated, the influence ways of the extensive stacking on the environment are many, the pollution forms are also complex and various, the atmospheric environment, the soil environment and the like can be directly or indirectly polluted, and reasonable resource recycling is urgently needed. The construction waste is recycled, the quality of regenerated products is improved, the problem of accumulation of the construction waste can be solved, the pollution to the environment is reduced, natural sandstone resources can be saved, the development concept of environmental protection and sustainability is met, and the method is also beneficial to the aspects of environmental protection, construction cost and the like.
In recent years, most of buildings dismantled in China are brick-concrete structures, waste clay sintered bricks account for about 60% of the total amount of construction wastes, professional sorting equipment for different types of construction wastes in brick-concrete is increasingly improved, resource enterprises produce brick-concrete materials and are mature day by day, systematic research on application technical indexes of the brick-concrete construction waste recycled aggregate is gradually systematic, and the popularization and the application of the construction waste recycled aggregate are very facilitated. Building materials such as cement, fly ash and river sand are important components in wet-mixed mortar, and sand and stone are often used as high-quality building materials due to good hardness and stable chemical properties, and are widely applied to the fields of houses, highways, railways and the like. The building material storage problem is increasingly prominent by combining the characteristics of large quantity of infrastructure, basic material characteristics and irreplaceability of Chinese gravels.
Therefore, aiming at the increasingly severe form of building material resources in China and the problem that a large amount of building garbage generated by urban construction is difficult to treat, the brick-concrete building garbage is applied to wet-mixed mortar after being sorted, subjected to soil removal, graded crushing and screened, so as to replace part of building materials. Therefore, the application of the recycled brick-concrete sand powder in wet-mixed mortar is particularly important. The problem of building rubbish accumulation can be solved, the pollution to the environment is reduced, the development concept of green and sustainability is met, natural sandstone resources can be saved, the engineering cost is reduced, and great benefits are brought to the development of the economy and the society.
Disclosure of Invention
On the premise of fully referring to the prior technical data, the invention aims to solve the problems that the form of building material resources in China is increasingly severe and a large amount of building waste generated by urban construction is difficult to treat, and the recycled brick-concrete sand powder is applied to the wet-mixed mortar, so that the wet-mixed mortar with higher viscosity is obtained, and meanwhile, the wet-mixed mortar has higher compressive strength, tensile bonding strength and flexural strength, and the building waste is recycled.
In order to achieve the purpose, the invention adopts the following technical measures:
a preparation method of a recycled brick mixed sand powder material acting on wet-mixed mortar comprises the following preparation steps:
step 1), crushing the demolished building waste into medium particles by a jaw crusher, and conveying the medium particles to a cone crusher for reinforced crushing.
Two jaw plates of jaw crusher, first fixed jaw plate (fixed jaw), perpendicular (or the upper end is slightly extroversion) is fixed on the organism antetheca, another is movable jaw plate (movable jaw), and the position slope forms big-end-up's broken chamber (working chamber) with fixed jaw plate. The movable jaw is periodically reciprocated, away from and towards the fixed jaw. When the materials are separated, the materials enter the crushing cavity, and finished products are discharged from the lower part; when approaching, the material between the two jaws is squeezed, bent and split to be broken.
The cone crusher can crush various ores and rocks with medium and medium hardness or above. The cone crusher is sealed by adopting lubricating grease, the defects that a water supply and drainage system is easy to block and water and oil are easy to mix are overcome, and the spring safety system is an overload protection device and can prevent foreign matters and iron blocks from damaging the crusher by passing through the crushing cavity.
And 2) conveying the crushed material to a particle size sieve through a conveying belt for sieving.
The particle size sieve is divided into an upper layer and a lower layer, the top layer is a 15mm particle size sieve, and the middle layer is a 10mm particle size sieve and is cylindrical; the lower layer is a 5mm particle size sieve, and the lower part is provided with a bearing box.
Step 3) shaping particles with the diameter of less than 10mm, and removing powder by a dust collector; taking sand powder with the particle size of less than 5mm, and carrying out pre-wetting treatment.
Step 4), mixing the waste concrete and the waste red brick tiles after dust absorption and pre-wetting according to the same particle size according to a mass ratio of 1:2 mixing to obtain the recycled brick sand-mixed powder material.
The wet-mixed mortar containing the modified recycled brick-mixed sand powder comprises, by weight, 7-10 parts of cement, 2-5 parts of fly ash, 50-70 parts of river sand, 5-20 parts of recycled brick-mixed sand powder, 10-20 parts of water, 0.1-0.4 part of an additive, 0.1-0.4 part of a modifier and 0.2-0.5 part of a plastic retention agent.
The cement is aluminosilicate cement with the reference number of P.C 42.5.5 and the fineness of less than or equal to 5.0.
The density of the fly ash is 2.3(g/cm), and the water absorption capacity reaches 110%.
The fineness modulus of the river sand is 2.2, the total weight of particles with the particle size of more than 0.075mm is more than 85%, and the average particle size of the sand is 0.25-0.125 mm.
The recycled brick-concrete powder sand has the characteristics of porosity, high water absorption rate, high powder content and density smaller than that of a natural material. The grain diameter is 0-5mm, and the grain size is continuous gradation. The proportion of the regenerated sand powder accounts for 30-50% of the total amount of the sand,
the additive is prepared by combining 5 parts of fly ash, 15 parts of anhydrous sodium sulfate, 14 parts of triethanolamine, 25 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 7 parts of lauryl sodium sulfate, 26 parts of sodium carbonate and 8 parts of polyurethane.
The modifier is prepared by mixing potassium methyl silicate, sodium methyl silicate and sodium dodecyl benzene sulfonate according to the mass ratio of 1:2: 1.
The plastic retention agent comprises polyether monomer, carboxyl-terminated vinyl ether, isocyanate and hydrogen peroxide.
The wet-mixed mortar comprises the following manufacturing steps: (1) and (5) weighing. (2) And (6) blending. (3) And (6) checking.
Step 1), 8 parts of cement, 3 parts of fly ash, 62 parts of river sand, 10 parts of recycled brick mixed sand powder, 15 parts of water, 0.2 part of additive, 0.2 part of modifier and 0.5 part of plasticizer are respectively weighed by an electronic scale and are respectively placed in different test barrels.
Step 2) firstly, pouring the weighed 62 parts of river sand and 10 parts of recycled brick mixed sand powder into a mixing barrel A, starting a hand-held mixer, and stirring the river sand and the recycled brick mixed sand powder for 5min to fully mix the river sand and the recycled brick mixed sand powder; secondly, pouring 8 parts of cement and 3 parts of fly ash into a mixing barrel B, and starting a stirrer to mix for 3 min; then, pouring the cement and the fly ash which are uniformly stirred in the mixing barrel B into the mixing barrel A, and starting the hand-held stirrer to fully stir for 5min to ensure full stirring; immediately pouring 7 parts of water into a mixing barrel A, stirring for 3min, adding 0.2 part of modifier, stirring for 3min, and adding 0.2 part of additive; finally, 8 parts of water is poured into the mixture, and 0.5 part of plastic-retaining agent is added after the mixture is stirred for 8 min.
And 3) after the preparation is finished, placing the mixture in a proper environment for storage.
Compared with the prior art, the invention has the following advantages:
(1) the invention applies the modified recycled brick mixed sand powder to the wet-mixed mortar, and obviously improves the fluidity, compressive strength, tensile bonding strength and flexural strength of the wet-mixed mortar.
(2) The wet-mixed mortar modifier used in the invention is prepared by mixing potassium methyl silicate, sodium methyl silicate and sodium dodecyl benzene sulfonate according to the mass ratio of 1:2: 1. The surface interface performance of the brick-concrete sand powder can be obviously improved, and the water absorption and release effects of the brick-concrete sand powder can be well regulated and controlled.
(3) The wet-mixed mortar additive used in the invention is prepared by combining fly ash, anhydrous sodium sulfate, triethanolamine, fatty alcohol-polyoxyethylene ether sodium sulfate, lauryl sodium sulfate, sodium carbonate and polyurethane. The addition of the polyurethane effectively improves the bonding property of the wet-mixed mortar.
(4) The plastic-retaining agent used in the invention comprises polyether monomer, carboxyl-terminated vinyl ether, isocyanate and hydrogen peroxide. The addition of the isocyanate greatly improves the bonding property of the wet-mixed mortar.
(5) The wet-mixed mortar mixing process adopted by the invention can effectively and fully mix all components of the wet-mixed mortar uniformly, and greatly improves the application performance of the wet-mixed mortar.
(6) The invention can solve the problem of building garbage accumulation, reduce the pollution to the environment, accord with the development idea of green and sustainability, save natural sandstone resources, reduce the engineering cost and bring huge benefits for the development of the economy and the society.
Detailed description of the preferred embodiment
The wet-mixed mortar containing modified recycled brick mixed sand powder is prepared by respectively adding 5 parts, 10 parts and 15 parts of recycled brick mixed sand powder, and performing consistency, water retention rate, compressive strength test, tensile bonding strength test and flexural strength test on the mixture. The protocol was as follows:
consistency, water retention: respectively according to items 4 and 7 of JGJ70-90 building mortar basic performance test method;
compressive strength: the method is carried out according to item 9 of JGJ70-90 building mortar basic performance test method, and the specification of a test piece is 70.7mm multiplied by 70.7 mm;
tensile bond strength: the method is carried out according to item 10 of JGJ70-90 basic performance test method of building mortar, and the specification of a test piece is 70.7mm multiplied by 20 mm;
breaking strength: the method is carried out according to GB/T17671-1999 method for testing cement mortar strength (ISO method).
Example 1: the wet-mixed mortar containing 5 parts of the recycled brick-concrete powder was subjected to a compressive strength test, a tensile bond strength test and a flexural strength test.
A material of wet-mixed mortar containing recycled brick-concrete sand powder is prepared by the following steps:
step 1), 8 parts of cement, 3 parts of fly ash, 68.1 parts of river sand, 5 parts of recycled brick mixed sand powder, 15 parts of water, 0.2 part of additive, 0.2 part of modifier and 0.5 part of plastic retention agent are respectively weighed by an electronic scale and are respectively placed in different test barrels.
Step 2) firstly, pouring 68.1 parts of river sand and 5 parts of recycled brick mixed sand powder which are weighed into a mixing barrel A, starting a hand-held mixer, and stirring the river sand and the recycled brick mixed sand powder for 5min to fully mix the river sand and the recycled brick mixed sand powder; secondly, pouring 8 parts of cement and 3 parts of fly ash into a mixing barrel B, and starting a stirrer to mix for 3 min; then, pouring the cement and the fly ash which are uniformly stirred in the mixing barrel B into the mixing barrel A, and starting the hand-held stirrer to fully stir for 5min to ensure full stirring; immediately pouring 7 parts of water into the mixing barrel A, stirring for 3min, adding 0.2 part of additive, stirring for 3min, and adding 0.2 part of additive; finally, 8 parts of water is poured into the mixture, and 0.5 part of plastic-retaining agent is added after the mixture is stirred for 8 min.
And 3) pouring 3 compression strength test blocks after the preparation is finished.
Consistency:
firstly, lightly wiping the sliding rod by using a small amount of lubricating oil, and wiping redundant oil on the sliding rod by using oil absorption paper to enable the sliding rod to freely slide;
and secondly, wiping the surfaces of the mortar container and the test cone by using a wet cloth, and filling the mortar mixture into the container at one time to enable the surface of the mortar to be about 10mm lower than the opening of the container. Uniformly inserting and tamping the container for 25 times from the center to the edge of the container by using a tamping rod, then slightly shaking or knocking the container for 5-6 times to level the surface of the mortar, and then placing the container on a base of a consistency tester;
thirdly, loosening the brake screw, moving the slide rod downwards, tightening the brake screw when the tip of the test cone is just contacted with the surface of the mortar, enabling the lower end of the rack side rod to just contact the upper end of the slide rod, and reading the reading (accurate to 1mm) on the dial;
loosening the brake screw, simultaneously timing, immediately tightening the screw at 10s, contacting the lower end of the rack measuring rod with the upper end of the sliding rod, reading the sinking depth (accurate to 1mm) from the dial scale, and obtaining the difference value of the secondary reading, namely the consistency value of the mortar;
and fifthly, filling the mortar in the container, only allowing the consistency to be measured once, and sampling again for measurement when the consistency is repeatedly measured, wherein the test results are shown in table 1.
TABLE 1.2h consistency
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Consistency (mm) | 102 | 106 | 104 | 104 |
Water retention:
firstly, weighing the mass m of the lower waterproof sheet and the dry test mold 1 And mass m of 8 pieces of medium-speed qualitative filter paper 2 。
And secondly, filling the mortar mixture into the test mold at one time, inserting and tamping for a plurality of times by using a spatula, scraping off redundant mortar on the surface of the test mold at one time by using the spatula at an angle of 45 degrees when the filled mortar is slightly higher than the edge of the test mold, and then scraping the mortar on the opposite direction of the surface of the test mold at a relatively flat angle by using the spatula.
Thirdly, wiping off the mortar on the edge of the test mold, and weighing the total mass m of the test mold, the lower impervious sheet and the mortar 3 。
And fourthly, covering the surface of the mortar with 2 pieces of medical cotton yarn, placing 8 pieces of filter paper on the surface of the cotton yarn, covering the surface of the filter paper with a waterproof sheet, and pressing the waterproof sheet with a weight of 2 kg.
Fifthly, moving away the heavy object and the impervious sheet after standing for 2min, taking out the filter paper (excluding the cotton sand), and quickly weighing the mass m of the filter paper 4 ；
And sixthly, calculating the water content of the mortar according to the proportion and the water adding amount of the mortar, wherein the test result is shown in a table 2.
TABLE 2 Water Retention
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Water retention (%) | 81.1 | 81.6 | 81.5 | 81.4 |
And (3) compression test:
firstly, after the test piece is taken out from a maintenance place, the test should be carried out as soon as possible so as to avoid the temperature and humidity inside the test piece from changing obviously. Before the test, the test piece is wiped clean, the size is measured, and the appearance is checked. The size of the test piece is measured to be 1mm accurately, and the pressure bearing area of the test piece is calculated according to the size. If the difference between the measured size and the nominal size is not more than 1mm, the calculation can be carried out according to the nominal size.
And secondly, placing the test piece on a lower pressing plate (or a lower backing plate) of the testing machine, wherein the pressure bearing surface of the test piece is vertical to the top surface during molding, and the center of the test piece is aligned with the center of the lower pressing plate (or the lower backing plate) of the testing machine. And starting the testing machine, and adjusting the ball seat to enable the contact surface to be uniformly pressed when the upper pressing plate is close to the test piece (or the upper base plate). The loading test should be continuously and uniformly loaded, the loading speed should be 0.5-1.5 kN per second (when the mortar strength is 5MPa and below 5MPa, the lower limit is preferably selected, and when the mortar strength is above 5MPa, the upper limit is preferably selected), when the test piece approaches to the damage and begins to deform rapidly, the accelerator of the testing machine is stopped to adjust until the test piece is damaged, and then the damage load is recorded.
And thirdly, taking 1.3 times of the arithmetic average value of the measured values of the three test pieces as the average value of the compressive strength of the cubic mortar test pieces (accurate to 0.1MPa) of the group of test pieces, and the test results are shown in a table 3.
TABLE 3 compressive Strength
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Compressive strength (MPa) | 5.8 | 6.2 | 6.4 | 6.13 |
Tensile adhesion test:
1. and (3) maintaining the test piece for 13d under the standard test condition, coating an epoxy resin and other high-strength adhesives on the surface of the test piece, aligning the upper clamp, placing the upper clamp on the adhesives, ensuring that the upper clamp is not inclined, and continuing to maintain for 24 h.
2. The tensile bond strength was measured. Sleeving a steel base plate on the base mortar block, installing a tensile bonding strength clamp on a testing machine, placing the test piece in the tensile clamp, wherein the clamp is connected with the testing machine by adopting a ball hinge movable connection, and loading at the speed of (5 +/-1) mm/min until the test piece is damaged. And (3) when the test is carried out, the damage surface is in the inspection mortar, the value is considered to be effective, and the load value of the test piece during damage is recorded. If the failure mode is tensile clamp and adhesive failure, the test results are invalid and are shown in Table 4.
TABLE 4 tensile bond Strength
And (3) bending resistance test:
one side of the test body is placed on a supporting cylinder of a testing machine, the long axis of the test body is vertical to the supporting cylinder, and load is uniformly and vertically applied to the opposite side of the prism through a loading cylinder at the speed of 50N/s +/-10N/s until the test body is broken. The test results are shown in Table 5.
TABLE 5 flexural Strength
| Test block numbering | 1 | 2 | 3 | 4 | 5 | 6 | Mean value of |
| Flexural strength (MPa) | 4.2 | 4.4 | 4.1 | 4.5 | 4.2 | 4.6 | 4.3 |
Example 2: the wet-mixed mortar containing 10 parts of the recycled brick-concrete sand powder is subjected to a compressive strength test, a tensile bond strength test and a breaking strength test.
A wet-mixed mortar containing recycled brick-concrete sand powder is prepared by the following steps:
step 1), 8 parts of cement, 3 parts of fly ash, 63.1 parts of river sand, 10 parts of recycled brick mixed sand powder, 15 parts of water, 0.2 part of additive, 0.2 part of modifier and 0.5 part of plastic retention agent are respectively weighed by an electronic scale and are respectively placed in different test barrels.
Step 2) firstly, pouring 63.1 parts of river sand and 10 parts of recycled brick mixed sand powder into a mixing barrel A, starting a hand mixer, and stirring the river sand and the recycled brick mixed sand powder for 5min to fully mix the river sand and the recycled brick mixed sand powder; secondly, pouring 8 parts of cement and 3 parts of fly ash into a mixing barrel B, and starting a stirrer to mix for 3 min; then, pouring the cement and the fly ash which are uniformly stirred in the mixing barrel B into the mixing barrel A, and starting the hand-held stirrer to fully stir for 5min to ensure full stirring; and immediately pouring 7 parts of water into the mixing barrel A, stirring for 3min, adding 0.2 part of the additive, finally pouring 8 parts of water, stirring for 8min, and adding 0.5 part of the plastic-retaining agent.
And 3) pouring 3 compression strength test blocks after the preparation is finished.
Consistency test:
the procedure of the compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 6.
TABLE 6.2h consistency
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Consistency (mm) | 106 | 104 | 108 | 106 |
Water retention test:
the procedure of the compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 7.
TABLE 7 Water Retention
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Water retention (%) | 88.8 | 88.6 | 88.4 | 88.6 |
The procedure of the compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 8.
And (3) compression test:
TABLE 8 compressive Strength
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Compressive strength (Mpa) | 7.2 | 7.5 | 7.3 | 7.3 |
Tensile adhesion test:
a wet-mixed mortar containing recycled brick-concrete powder was subjected to the tensile bonding test in the same manner as in example 1, and the test results are shown in Table 9.
TABLE 9 tensile bond Strength
And (3) bending resistance test:
the procedure for the flexural test of a wet-mixed mortar containing recycled brick-concrete mortar was the same as in example 1, and the test results are shown in Table 10.
TABLE 10 flexural Strength
| Test block numbering | 1 | 2 | 3 | 4 | 5 | 6 | Mean value of |
| Flexural strength (MPa) | 5.2 | 5.4 | 4.9 | 5.5 | 5.3 | 5.2 | 5.4 |
Example 3: the wet-mixed mortar containing 10 parts of the recycled brick-concrete sand powder was subjected to a compressive strength test, a tensile bond strength test and a flexural strength test.
A wet-mixed mortar containing recycled brick-concrete sand powder is prepared by the following steps:
step 1), 8 parts of cement, 3 parts of fly ash, 58.1 parts of river sand, 15 parts of recycled brick mixed sand powder, 15 parts of water, 0.2 part of additive, 0.2 part of modifier and 0.5 part of plasticizer are respectively weighed by an electronic scale and are respectively placed in different test barrels.
Step 2) firstly, pouring 58.1 parts of river sand and 15 parts of recycled brick mixed sand powder which are weighed into a mixing barrel A, starting a hand-held mixer, and stirring the river sand and the recycled brick mixed sand powder for 5min to fully mix the river sand and the recycled brick mixed sand powder; secondly, pouring 8 parts of cement and 3 parts of fly ash into a mixing barrel B, and starting a stirrer to mix for 3 min; then, pouring the cement and the fly ash which are uniformly stirred in the mixing barrel B into the mixing barrel A, and starting the hand-held stirrer to fully stir for 5min to ensure full stirring; immediately pouring 7 parts of water into a mixing barrel A, stirring for 3min, adding 0.2 part of additive, stirring for 3min, and adding 0.2 part of modifier; finally, 8 parts of water is poured into the mixture, and 0.5 part of plastic-retaining agent is added after the mixture is stirred for 8 min.
And 3) pouring 3 compression strength test blocks after the preparation is finished.
Consistency test:
the procedure of the compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 11.
TABLE 11.2h consistency
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Consistency (mm) | 102 | 98 | 103 | 101 |
Water retention test:
the procedure of the compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 12.
TABLE 12 Water Retention
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Water retention (%) | 85.1 | 86.2 | 85.5 | 85.6 |
The procedure of the compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 13.
And (3) compression test:
TABLE 13 compressive Strength
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Compressive strength (Mpa) | 7.2 | 7.5 | 7.3 | 7.3 |
Tensile adhesion test:
the results are shown in table 1 and table 4. The procedure of the tensile bond test of the wet-mixed mortar containing recycled brick-concrete powder is the same as that of example 1, and the test results are shown
TABLE 14 tensile bond Strength
And (3) bending resistance test:
the procedure of the flexural test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 15.
TABLE 15 flexural Strength
| Test block numbering | 1 | 2 | 3 | 4 | 5 | 6 | Mean value of |
| Flexural strength (MPa) | 5.2 | 5.4 | 4.9 | 5.5 | 5.3 | 5.2 | 5.4 |
And (3) compression test:
the procedure of the material compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 16.
TABLE 16 compressive Strength
Tensile adhesion test:
the results of the test are shown in Table 1, regeneration 7. The material tensile bond test procedure for wet-mixed mortar of brick-concrete sand powder was the same as in example 1,
TABLE 17 tensile bond Strength
And (3) bending resistance test:
the procedure of the flexural test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 18.
TABLE 18 flexural Strength
| Test block numbering | 1 | 2 | 3 | 4 | 5 | 6 | Mean value of |
| Flexural strength (MPa) | 5.3 | 5.4 | 5.0 | 5.4 | 5.3 | 5.2 | 5.3 |
Comparative example: and carrying out a compression strength test, a tensile bonding strength test and a breaking strength test on the wet-mixed mortar without the recycled brick mixed sand powder.
A material of wet-mixed mortar containing recycled brick-concrete sand powder is prepared by the following steps:
step 1), 8 parts of cement, 3 parts of fly ash, 73.1 parts of river sand, 0 part of recycled brick mixed sand powder, 15 parts of water, 0.2 part of additive, 0.2 part of modifier and 0.5 part of plasticizer are respectively weighed by an electronic scale and are respectively placed in different test barrels.
Step 2), firstly, pouring 73.1 parts of weighed river sand into a mixing barrel A; secondly, pouring 8 parts of cement and 3 parts of fly ash into a mixing barrel B, and starting a stirrer to mix for 3 min; then, pouring the cement and the fly ash which are uniformly stirred in the mixing barrel B into the mixing barrel A, and starting the hand-held stirrer to fully stir for 5min to ensure full stirring; then pouring 7 parts of water into a mixing barrel A, stirring for 3min, adding 0.2 part of additive, stirring for 3min, and adding 0.2 part of modifier; finally, 8 parts of water is poured into the mixture, and 0.5 part of plastic-retaining agent is added after the mixture is stirred for 8 min.
And 3) pouring 3 compression strength test blocks after the preparation is finished.
Consistency test:
the procedure of the material compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 19.
TABLE 19.2h consistency
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Consistency (mm) | 84 | 88 | 83 | 85 |
Water retention test:
the procedure of the material compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 20.
TABLE 20 Water Retention
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Water retention (%) | 78.8 | 79.2 | 78.7 | 78.9 |
And (3) compression test:
the procedure of the material compression test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 21.
TABLE 21 compressive Strength
| Test block numbering | 1 | 2 | 3 | Mean value of |
| Compressive strength (MPa) | 5.6 | 5.8 | 5.8 | 5.7 |
Tensile adhesion test:
the results of the test are shown in Table 2, regeneration 2. The material tensile bond test procedure for wet-mixed mortar of brick-concrete sand powder was the same as in example 1,
TABLE 22 tensile bond Strength
And (3) bending resistance test:
the procedure of the flexural test of a wet-mixed mortar containing recycled brick-concrete powder was the same as in example 1, and the test results are shown in Table 23.
TABLE 23 flexural Strength
The test results of examples and comparative examples are summarized in Table 24.
TABLE 24 summary of the invention
| Item | Example 1 | Example 2 | Example 3 | Comparative example |
| Consistency (mm) | 104 | 106 | 101 | 85 |
| Water retention (%) | 81.4 | 88.6 | 85.6 | 78.9 |
| Compressive strength (MPa) | 6.1 | 7.3 | 7.3 | 5.7 |
| Adhesive Strength (MPa) | 0.23 | 0.30 | 0.31 | 0.21 |
| Flexural strength (MPa) | 4.3 | 5.4 | 5.3 | 4.0 |
As shown in Table 6, the consistencies of the examples 1, 2 and 3 are respectively improved by 22%, 25% and 19% compared with the consistency of the comparative example; the water retention rate is respectively improved by 3 percent, 12 percent and 8 percent; the compressive strength is respectively improved by 7 percent, 28 percent and 28 percent; the tensile bonding strength is respectively improved by 9.5 percent, 42.8 percent and 47.6 percent; the breaking strength is respectively improved by 7.5 percent, 35 percent and 32.5 percent. The consistency and the water retention rate are increased and then reduced along with the increase of the regenerated brick-mixed sand powder, and the compressive strength, the tensile bonding strength and the flexural strength are increased and then basically unchanged along with the increase of the regenerated brick-mixed sand powder, which shows that the strength of the wet-mixed mortar can be effectively improved by adding the regenerated brick-mixed sand powder into the wet-mixed mortar, and the action change is not obvious after a certain amount of the regenerated brick-mixed sand powder is reached.
Claims (8)
1. A wet-mixed mortar containing recycled brick-concrete sand powder is characterized in that the recycled brick-concrete sand powder is prepared from waste concrete and waste red brick tiles according to the same particle size by mass ratio of 1:2 mixing the materials into a reclaimed brick sand-mixed powder material; the wet-mixed mortar material comprises, by weight, 7-10 parts of cement, 2-5 parts of fly ash, 50-70 parts of river sand, 5-20 parts of recycled brick mixed sand powder, 10-20 parts of water, 0.1-0.4 part of an additive, 0.1-0.4 part of a modifier and 0.2-0.5 part of a plastic retention agent.
2. The wet-mixed mortar of claim 1, wherein the recycled brick-concrete sand powder is produced by subjecting construction waste to primary sorting, soil removal, jaw primary crushing, cone crushing for secondary crushing after primary crushing, sieving after secondary crushing, shaping of particles having a particle size of 10mm or less, dust removal by a dust collector, sieving, pre-wetting treatment of sand powder having a particle size of 5mm or less; mixing waste concrete and waste tiles according to a mass ratio of 1:2, mixing the components.
3. The wet-mixed mortar of claim 1, wherein the material comprises, by weight, 7-10 parts of cement, 2-5 parts of fly ash, 50-70 parts of river sand, 5-20 parts of recycled brick-mixed sand powder, 10-20 parts of water, 0.1-0.4 part of an external additive, and 0.2-0.5 part of a plastic-retaining agent.
4. The wet-mixed mortar of claim 1, wherein the material comprises, by weight, 8 parts of cement, 3 parts of fly ash, 63.1 parts of river sand, 10 parts of recycled brick mixed sand powder, 15 parts of water, 0.2 part of additive, 0.2 part of modifier, and 0.5 part of plasticizer.
5. The wet-mixed mortar of claim 1, wherein the admixture is composed of 5 parts of fly ash, 15 parts of anhydrous sodium sulfate, 14 parts of triethanolamine, 25 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 7 parts of sodium dodecyl sulfate, 26 parts of sodium carbonate and 8 parts of polyurethane.
6. The wet-mixed mortar of claim 1, wherein the modifier is prepared by mixing potassium methyl silicate, sodium methyl silicate and sodium dodecyl benzene sulfonate according to a mass ratio of 1:2: 1.
7. The wet-mixed mortar of claim 1, wherein the plasticity-maintaining agent is composed of polyether monomers, carboxyl-terminated vinyl ethers, isocyanates and hydrogen peroxide.
8. A preparation process of wet-mixed mortar containing recycled brick mixed sand powder is characterized in that 61.8 parts of river sand and 10 parts of recycled brick mixed sand powder are weighed and poured into a mixing barrel A, a hand-held mixer is started, and the river sand and the recycled brick mixed sand powder are mixed for 5min and fully mixed; secondly, pouring 8 parts of cement and 3 parts of fly ash into a mixing barrel B, and starting a stirrer to mix for 3 min; then, pouring the cement and the fly ash which are uniformly stirred in the mixing barrel B into the mixing barrel A, and starting the hand-held stirrer to fully stir for 5min to ensure full stirring; immediately pouring 7 parts of water into a mixing barrel A, stirring for 3min, adding 0.2 part of additive, stirring for 3min, and adding 0.2 part of modifier; finally, 8 parts of water is poured into the mixture, and 0.5 part of plastic-retaining agent is added after the mixture is stirred for 8 min.
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| CN105418011A (en) * | 2015-11-24 | 2016-03-23 | 中建商品混凝土西安有限公司 | Wet-mixed mortar doped with recycled fine aggregate |
| CN113563023A (en) * | 2021-08-02 | 2021-10-29 | 北京建工资源循环利用投资有限公司 | Premixed mortar and application thereof |
| CN114031340A (en) * | 2021-11-30 | 2022-02-11 | 东南大学 | Plastering mortar containing recycled aggregate of waste clay brick |
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| CN105418011A (en) * | 2015-11-24 | 2016-03-23 | 中建商品混凝土西安有限公司 | Wet-mixed mortar doped with recycled fine aggregate |
| CN113563023A (en) * | 2021-08-02 | 2021-10-29 | 北京建工资源循环利用投资有限公司 | Premixed mortar and application thereof |
| CN114031340A (en) * | 2021-11-30 | 2022-02-11 | 东南大学 | Plastering mortar containing recycled aggregate of waste clay brick |
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Application publication date: 20220830 |