CN113443874A - Nano calcium carbonate and polypropylene fiber synergistically enhanced recycled concrete and preparation method thereof - Google Patents
Nano calcium carbonate and polypropylene fiber synergistically enhanced recycled concrete and preparation method thereof Download PDFInfo
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- CN113443874A CN113443874A CN202110720915.XA CN202110720915A CN113443874A CN 113443874 A CN113443874 A CN 113443874A CN 202110720915 A CN202110720915 A CN 202110720915A CN 113443874 A CN113443874 A CN 113443874A
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of recycled concrete, and particularly relates to recycled concrete synergistically enhanced by nano calcium carbonate and polypropylene fibers and a preparation method thereof. The recycled concrete comprises raw materials such as cement, natural coarse aggregate, natural fine aggregate, recycled coarse aggregate, water, nano calcium carbonate, polypropylene fiber and polycarboxylic acid high-efficiency water reducing agent, and the mass mixture ratio of the components is as follows in sequence: 1 (2.19-2.26), (1.84-1.90), (0.93-0.97), (0.46-0.51), (0.010-0.044), (0.002-0.005), (0.003-0.009). Due to the microparticle effect and high pozzolanic activity of the nano calcium carbonate, the density reduction caused by the polypropylene fiber is filled after the nano calcium carbonate is doped, and the generated C-S-H gel enables the slurry to be better combined with the polypropylene fiber; the rough surface of the recycled aggregate also provides more contact surfaces for the nano calcium carbonate, so that the recycled aggregate and the cement paste are bonded more tightly, the compactness of the recycled concrete is improved, and the compressive strength is increased.
Description
Technical Field
The invention belongs to the technical field of recycled concrete, and particularly relates to recycled concrete synergistically enhanced by nano calcium carbonate and polypropylene fibers and a preparation method thereof.
Background
In recent years, the building industry of China is developed rapidly, central cities, urban zones, urban groups and urban circles appear in succession, and the scale of urban construction and urban transformation is large. On one hand, the demand for the traditional building material, namely concrete, is rapidly increased, and on the other hand, the construction waste formed by the waste concrete generated by removal and the like is also rapidly generated, so that the contradiction between the two is more sharp, and the sustainable development of the building industry is restricted. Aiming at the green policy and policy of 'recycling of building resources' vigorously advocated in China, the recycling of the waste concrete is a necessary way for building a resource-saving and environment-friendly society, and has great economic benefit, environmental benefit and social value.
The recycled aggregate is mainly a concrete crushed material formed by mechanically crushing waste concrete. Compared with natural aggregate, the recycled aggregate has wide sources and uneven quality. In addition, the factors of the mortar coated on the surface of the recycled aggregate, such as a weak mortar-aggregate contact interface, micro-holes and cracks in an internal structure and the like are main reasons for causing poor performance of the recycled aggregate. These factors all lead to an increase in the water absorption rate and water absorption rate of the recycled aggregate, and at the same time, the dry shrinkage of the prepared recycled aggregate concrete increases, so that the generation and development of internal cracks therein increase. Therefore, the compressive strength and the fracture resistance of the recycled aggregate concrete are lower than the corresponding indexes of the natural aggregate concrete, and the wide application and development of the recycled aggregate concrete in the building industry are greatly limited.
For the inferior mechanical properties of recycled aggregate concrete, attempts have been made to incorporate fibers, mineral admixtures and nanomaterials into recycled concrete aggregates to improve the overall properties of the prepared recycled concrete. Researches show that the polypropylene fiber has the characteristic of anisotropy in cement mortar, and can form a stable supporting structure to reduce the generation and development of cracks in a matrix, so that the splitting tensile strength and the breaking strength of the recycled concrete are obviously improved. At the same time, however, the compressive strength of the concrete is reduced due to the reduction in internal compactness.
In order to solve the problem of recycling of waste concrete, a preparation method of recycled concrete is urgently needed to be found, so that the waste concrete can be consumed in a large amount, and the recycled concrete can be applied to high quality in practical engineering.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the nano calcium carbonate and polypropylene fiber synergistically enhanced recycled concrete and a preparation method thereof.
The technical scheme provided by the invention is as follows:
the nano calcium carbonate and polypropylene fiber synergistically enhanced recycled concrete comprises raw materials such as cement, natural coarse aggregate, natural fine aggregate, recycled coarse aggregate, water, nano calcium carbonate, polypropylene fiber and polycarboxylic acid high-efficiency water reducing agent, and the mass mixing ratio of the components is as follows in sequence:
1:(2.19～2.26):(1.84～1.90):(0.93～0.97):(0.46～0.51):(0.010～0.044):(0.002～0.005):(0.003～0.009)。
in the technical scheme, due to the microparticle effect and high pozzolanic activity of the nano calcium carbonate, the density reduction caused by the polypropylene fiber is filled after the nano calcium carbonate is doped, and the generated C-S-H gel enables the slurry to be better combined with the polypropylene fiber; the rough surface of the recycled aggregate also provides more contact surfaces for the nano calcium carbonate, so that the recycled aggregate and the cement paste are bonded more tightly, the compactness of the recycled concrete is improved, and the compressive strength is increased. Therefore, the problem that the compressive strength of the concrete is reduced due to the reduction of the internal compactness of the concrete caused by the polypropylene fiber is solved.
Specifically, the cement is P.O 42.5.5-grade ordinary portland cement.
Specifically, the natural coarse aggregate is limestone macadam in continuous gradation, and the particle size is 5-25 mm.
Specifically, the recycled coarse aggregate is continuous graded coarse aggregate obtained by crushing waste concrete and then screening, and the particle size is 5-20 mm.
Specifically, the natural fine aggregate is continuous-graded natural river sand, and the particle size is 0.075-4.75 mm.
Specifically, the particle size of the nano calcium carbonate is 20-80 nm, and the content of the nano calcium carbonate is more than or equal to 99.5%.
The nano calcium carbonate with the particle size can fully exert the high volcanic ash activity and the microparticle effect, thereby obviously improving the splitting tensile strength and the breaking strength of the recycled concrete.
Specifically, the density of the polypropylene fiber is 0.9kg/m3The length-diameter ratio of the polypropylene fiber is 13.95, and the tensile strength of the polypropylene fiber is greater than or equal to 530 MPa.
The polypropylene fiber with the density can be fully stirred and uniformly dispersed in the slurry, so that the splitting tensile strength and the breaking strength of the recycled concrete are obviously improved.
The polypropylene fiber with the length-diameter ratio can fully play the role of bridging and crack resistance, thereby obviously improving the splitting tensile strength and the breaking strength of the recycled concrete.
Specifically, the solid content of the high-efficiency polycarboxylate superplasticizer is 20%.
The invention also provides a preparation method of the recycled concrete, which comprises the following steps:
s1: weighing the required raw materials according to the mass mixing ratio;
s2: mixing cement and nano calcium carbonate, and turning and stirring uniformly;
s3: mixing a polycarboxylic acid water reducing agent, polypropylene fibers and water, and stirring for 90s to uniformly disperse the polypropylene fibers to form a mixed solution;
s4: and (3) pouring all the rest other raw materials into a stirrer, stirring for 60s, adding the mixed solution obtained in the step (3), and continuously stirring for 150s to obtain the recycled concrete.
Compared with the prior art, the invention has the following beneficial effects:
1. the construction concrete crushed material is used as recycled aggregate to prepare recycled concrete, so that the problems of resource waste, environmental pollution and the like caused by the construction concrete crushed material are greatly relieved.
2. Based on the characteristic of poorer mechanical property of the recycled concrete prepared by directly utilizing the recycled aggregate, the polypropylene fiber which has stable physical property, low water absorption and easy dispersion in concrete slurry is used for modifying the recycled concrete, and the advantages of effectively limiting the development and generation of micro cracks in the recycled concrete and boosting the splitting tensile strength and the breaking strength of the recycled concrete are utilized.
3. Based on the characteristics of the microparticle effect and high pozzolanic activity of nano calcium carbonate, the nano calcium carbonate is used for modifying the recycled concrete, can effectively fill tiny holes in the recycled concrete, enhances the compactness of the recycled concrete, and simultaneously can enhance the binding capacity between cement and aggregate by a gel substance generated by hydration reaction with calcium hydroxide in cement paste, enhance the interaction of interfaces and improve the mechanical strength of the concrete.
4. Based on the rough surface of the recycled aggregate, the polypropylene fiber consumes more energy after being stressed in the recycled concrete, so that the polypropylene fiber has better bridging and crack-resisting functions. In addition, the rough surface provides more reaction contact surfaces for the nano calcium carbonate, so that the recycled aggregate and the slurry have better bonding effect.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The cement used in the examples and comparative examples of the present invention was P.O 42.5.5-grade ordinary portland cement; the natural coarse aggregate is limestone broken stone with continuous gradation, the particle size is 5-25 mm, and the natural coarse aggregate is provided by Zhongjian commercial product concrete Co., Ltd; the recycled coarse aggregate is continuous graded coarse aggregate obtained by crushing waste concrete and screening, has a particle size of 5-20 mm and is provided by Hubei Huidi recycled resource development and utilization company Limited; the natural fine aggregate is continuous graded natural river sand, the particle size is 0.075-4.75 mm, and the natural fine aggregate is provided by Zhongjia commercial concrete Co.Ltd; the particle size of the nano calcium carbonate is 20-80 NM, the content of the nano calcium carbonate is more than or equal to 99.5 percent, and the nano calcium carbonate is MJ-NM90 type nano calcium carbonate purchased from Suzhou famous craftsman fine chemical engineering company; the density of the polypropylene fiber is 0.9kg/m3The length-diameter ratio of the polypropylene fiber is 13.95, and the polypropylene fiberPolypropylene fiber having a tensile strength of 530MPa or more and available from Taili chemical fiber products Co., Ltd; the high-efficiency polycarboxylate superplasticizer has a solid content of 20 percent and is purchased from SY-1B type superplasticizer of Shengxin Source company.
Example 1
The mass ratio of the raw materials of the embodiment of the nano calcium carbonate and polypropylene fiber synergistically reinforced recycled concrete is that cement, natural coarse aggregate, natural fine aggregate, recycled coarse aggregate, water, nano calcium carbonate, polypropylene fiber and polycarboxylic acid high efficiency water reducing agent is 1:2.192:1.839:0.939:0.47:0.010:0.003: 0.007.
The water-gel ratio of the nano calcium carbonate to the polypropylene fiber synergistically enhanced recycled concrete is 1: 1.91.
A preparation method of nano calcium carbonate and polypropylene fiber synergistically enhanced recycled concrete comprises the following specific preparation method:
s1: weighing the required raw materials according to the mass mixing ratio;
s2: mixing cement and nano calcium carbonate, and turning and stirring uniformly;
s3: mixing a polycarboxylic acid water reducing agent, polypropylene fibers and water, and stirring for 90 seconds by using a glass rod to uniformly disperse the polypropylene fibers to form a mixed solution;
s4: and pouring all the dried aggregates with the designed gradation into a stirrer, stirring for 60s, adding the mixed solution, and continuously stirring for 150s to form the target recycled concrete mixture.
And (4) feeding the recycled concrete mixture into a mold, and vibrating to form a recycled concrete test piece. After the vibrated and molded test piece is placed indoors for 24 hours, the test piece is demoulded and numbered, then the test piece is transferred to a standard curing room with the temperature of (20 +/-2) DEG C and the relative humidity of more than 95 percent for curing for 28 days, and the mechanical strength of the regenerated concrete cooperatively enhanced by the nano calcium carbonate and the polypropylene fiber is detected according to the relevant regulations in GBT 50081 plus material 2019, namely the test result shows that the 28d compressive strength is 33.88MPa, the split tensile strength is 3.3MPa and the flexural strength is 6.68 MPa.
Example 2
The difference between the embodiment and the embodiment 1 is that the mass ratio of the raw materials is cement, natural coarse aggregate, natural fine aggregate, regenerated coarse aggregate, water, nano calcium carbonate, polypropylene fiber and polycarboxylic acid high efficiency water reducing agent is 1:2.214:1.858:0.949:0.47:0.020:0.003: 0.008.
And (3) performance testing: the method for manufacturing the test piece required for the performance test was the same as in example 1. Through tests, the compressive strength of the recycled concrete 28d prepared by the embodiment is 34.75MPa, the split tensile strength is 3.48MPa, and the breaking strength is 6.74 MPa.
Example 3
The difference between the embodiment and the embodiment 1 is that the mass ratio of the raw materials is cement, natural coarse aggregate, natural fine aggregate, regenerated coarse aggregate, water, nano calcium carbonate, polypropylene fiber and polycarboxylic acid high efficiency water reducing agent is 1:2.237:1.877:0.959:0.47:0.031:0.003: 0.009.
And (3) performance testing: the method for manufacturing the test piece required for the performance test was the same as in example 1. Through tests, the compressive strength of the recycled concrete 28d prepared by the embodiment is 34.16MPa, the split tensile strength is 3.29MPa, and the breaking strength is 6.83 MPa.
Example 4
The difference between the embodiment and the embodiment 1 is that the mass ratio of the raw materials is cement, natural coarse aggregate, natural fine aggregate, regenerated coarse aggregate, water, nano calcium carbonate, polypropylene fiber and polycarboxylic acid high efficiency water reducing agent is 1:2.260:1.896:0.969:0.47:0.042:0.003: 0.009.
And (3) performance testing: the method for manufacturing the test piece required for the performance test was the same as in example 1. Through tests, the compressive strength of the recycled concrete 28d prepared by the embodiment is 33.92MPa, the split tensile strength is 3.15MPa, and the breaking strength is 6.79 MPa.
Comparative example 1
The mass ratio of the raw materials of the regenerated concrete comparative example reinforced by the synergy of the nano calcium carbonate and the polypropylene fiber is that the cement, the natural coarse aggregate, the natural fine aggregate, the regenerated coarse aggregate, the water and the polycarboxylic acid high-efficiency water reducing agent are 1:2.17:1.820:0.930:0.527:0.007, and the water-glue ratio is 1: 1.91.
The preparation method of the recycled concrete comprises the following steps:
s1: weighing the required raw materials according to the mass mixing ratio;
s2: mixing a polycarboxylic acid water reducing agent, polypropylene fibers and water, and stirring for 90 seconds by using a glass rod to uniformly disperse the polycarboxylic acid water reducing agent, the polypropylene fibers and the water in the water;
s3: and pouring all the dried aggregates with the designed gradation into a stirrer, stirring for 60s, adding the mixed solution, and continuously stirring for 150s to form the target recycled concrete mixture.
And (3) performance testing: the method for manufacturing the test piece required for the performance test was the same as in example 1. Through tests, the 28d compressive strength, the split tensile strength and the breaking strength of the recycled concrete prepared by the comparative example are 32.81MPa, 2.75MPa and 6.64MPa respectively.
Comparative example 2
The mass ratio of the raw materials of the regenerated concrete comparative example reinforced by the nano calcium carbonate and the polypropylene fiber is that the cement, the natural coarse aggregate, the natural fine aggregate, the regenerated coarse aggregate, the polypropylene fiber, the water and the polycarboxylic acid high-efficiency water reducing agent are 1:2.17:1.820:0.930:0.003:0.527:0.007, and the water-cement ratio is 1: 1.91.
The preparation method of the recycled concrete comprises the following steps:
s1: weighing the required raw materials according to the mass mixing ratio;
s2: mixing a polycarboxylic acid water reducing agent with water, and stirring for 90s by using a glass rod to uniformly disperse the polycarboxylic acid water reducing agent in the water;
s3: and pouring all the dried aggregates with the designed gradation into a stirrer, stirring for 60s, adding the mixed solution, and continuously stirring for 150s to form the target recycled concrete mixture.
And (3) performance testing: the method for manufacturing the test piece required for the performance test was the same as in example 1. According to tests, the 28d compressive strength, the split tensile strength and the breaking strength of the recycled concrete prepared by the comparative example are 30.41MPa, 3.13MPa and 6.57MPa respectively.
The strength test results of the calcium carbonate recycled concrete synergistically enhanced by the polypropylene nano calcium carbonate and the polypropylene fiber obtained in the embodiments 1 to 4 and the comparative examples 1 to 2 of the invention are as follows:
table 1 method of implementation mechanical properties table
| Compressive strength (MPa) | Split tensile strength (MPa) | Flexural strength (MPa) | |
| Example 1 | 33.88 | 3.30 | 6.68 |
| Example 2 | 34.75 | 3.48 | 6.74 |
| Example 3 | 34.16 | 3.29 | 6.83 |
| Example 4 | 33.92 | 3.15 | 6.79 |
| Comparative example 1 | 32.81 | 2.75 | 6,34 |
| Comparative example 2 | 30.41 | 3.13 | 6.57 |
As can be seen from the above table, the recycled concrete obtained by the present invention has better mechanical properties than untreated recycled concrete. The compression strength of the recycled concrete in the mixture ratio of the embodiment 2 reaches 34.75MPa, the split tensile strength reaches 3.48MPa, the breaking strength is 6.74MPa, and the requirement of C30 concrete strength grade is met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The nano calcium carbonate and polypropylene fiber synergistically enhanced recycled concrete is characterized by comprising raw materials such as cement, natural coarse aggregate, natural fine aggregate, recycled coarse aggregate, water, nano calcium carbonate, polypropylene fiber and polycarboxylic acid high-efficiency water reducing agent, and the mass mixing ratio of the components is as follows in sequence:
1:(2.19～2.26):(1.84～1.90):(0.93～0.97):(0.46～0.51):(0.010～0.044):(0.002～0.005):(0.003～0.009)。
2. the nano calcium carbonate and polypropylene fiber synergistically reinforced recycled concrete according to claim 1, characterized in that: the cement is P.O 42.5.5-grade ordinary portland cement.
3. The nano calcium carbonate and polypropylene fiber synergistically reinforced recycled concrete according to claim 1, characterized in that: the natural coarse aggregate is limestone broken stone in continuous gradation, and the particle size is 5-25 mm.
4. The nano calcium carbonate and polypropylene fiber synergistically reinforced recycled concrete according to claim 1, characterized in that: the recycled coarse aggregate is continuous graded coarse aggregate obtained by crushing waste concrete and then screening, and the particle size is 5-20 mm.
5. The nano calcium carbonate and polypropylene fiber synergistically reinforced recycled concrete according to claim 1, characterized in that: the natural fine aggregate is continuous-graded natural river sand, and the particle size is 0.075-4.75 mm.
6. The nano calcium carbonate and polypropylene fiber synergistically reinforced recycled concrete according to claim 1, characterized in that: the particle size of the nano calcium carbonate is 20-80 nm, and the content of the nano calcium carbonate is more than or equal to 99.5%.
7. The nano calcium carbonate and polypropylene fiber synergistically reinforced recycled concrete according to claim 1, characterized in that: the density of the polypropylene fiber is 0.9kg/m3The length-diameter ratio of the polypropylene fiber is 13.95, and the tensile strength of the polypropylene fiber is greater than or equal to 530 MPa.
8. The recycled concrete reinforced synergistically with nanocalcium carbonate and polypropylene fibers according to any one of claims 1 to 7, wherein: the solid content of the high-efficiency polycarboxylic acid water reducing agent is 20%.
9. A method for the preparation of recycled concrete according to any one of claims 1 to 8, characterized in that it comprises the following steps:
s1: weighing the required raw materials according to the mass mixing ratio;
s2: mixing cement and nano calcium carbonate, and turning and stirring uniformly;
s3: mixing a polycarboxylic acid water reducing agent, polypropylene fibers and water, and stirring for 60-120 s to uniformly disperse the polypropylene fibers to form a mixed solution;
s4: and pouring all the rest other raw materials into a stirrer to be stirred for 30-60 s, adding the mixed liquid obtained in the step 3), and continuously stirring for 120-180 s to obtain the recycled concrete.
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Application publication date: 20210928 |