CN114230286A - High-crack-resistance and high-durability fair-faced concrete - Google Patents
High-crack-resistance and high-durability fair-faced concrete Download PDFInfo
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- CN114230286A CN114230286A CN202111667349.7A CN202111667349A CN114230286A CN 114230286 A CN114230286 A CN 114230286A CN 202111667349 A CN202111667349 A CN 202111667349A CN 114230286 A CN114230286 A CN 114230286A
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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
- 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
Abstract
The invention discloses a high-crack-resistance and high-durability fair-faced concrete which is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder, additive and water; the weight parts of the raw materials are as follows: 100-180 parts of cement, 450 parts of stone coarse material, 450 parts of medium sand fine material, 50-80 parts of low hydrothermal gelling agent, 30-50 parts of micro-filler, 30-50 parts of granulated blast furnace slag powder, 10-30 parts of zeolite powder, 2-5 parts of admixture and 80-100 parts of water. When the formula of the fair-faced concrete is adopted for construction, the building construction is carried out on the premise of having the conventional fair-faced concrete construction means, the obtained fair-faced concrete structure has very excellent anti-cracking performance and durability, the working performance and the apparent quality of the concrete can be improved on the premise of the construction, the fair-faced concrete structure has the performance of 'interior and exterior beauty', and the development of the fair-faced concrete technology is further promoted.
Description
Technical Field
The invention relates to the technical field of concrete and preparation thereof, in particular to clear water concrete with high crack resistance and durability.
Background
The fair-faced concrete is an environment-friendly building material, decorative materials such as ceramic tiles, stone and the like are not stuck on a wall body after the concrete is poured during construction of the fair-faced concrete, and meanwhile, the use of chemical products such as paint and the like is avoided, so that the environmental protection is facilitated; the bare concrete is constructed for one-time molding, the working procedures of chiseling, repairing, plastering and the like are not needed, the modification is not needed, a large amount of direct and indirect engineering cost is saved, and the generation of construction waste is greatly reduced; and the clear water concrete eliminates a plurality of hollows in the building and common defects of the conventional concrete construction quality such as slurry leakage, cracks, air holes and the like in the construction process, so that the clear water concrete is more and more accepted as novel concrete, is more and more applied in industrial and civil buildings, and is worthy of name green concrete.
Along with the increasing number of building structures adopting the fair-faced concrete as a matrix in recent years, the problems of the buildings with the fair-faced concrete structure are increased, wherein a plurality of fair-faced concrete building projects face serious structural cracking problems, because the fair-faced concrete does not use any decorative materials such as coatings and the like after being used, the decoration of the buildings is directly expressed by the original texture of the concrete, the apparent quality of the building structures is directly influenced by the cracking of the fair-faced concrete, and the development and the application of the fair-faced concrete are seriously restricted.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the fair-faced concrete with higher crack resistance and durability.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the clear water concrete with high crack resistance and durability comprises 180 parts of cement, 450 parts of stone coarse material, 450 parts of medium sand fine material, 50-80 parts of low hydrothermal gelling agent, 30-50 parts of micro-filler, 30-50 parts of granulated blast furnace slag powder, 10-30 parts of zeolite powder, 2-5 parts of admixture and 80-100 parts of water.
Preferably, the cement is ordinary portland cement; the stone coarse material is continuous grading limestone coarse material, and the particle size is 5-10 mm; the medium sand fine material is continuous grading medium river sand fine material, the fineness modulus is 2.5-2.8, and the mud content is less than 0.5%.
Preferably, the low-hydrothermal-content gelling agent consists of quartz powder and gypsum, the mass ratio of the quartz powder to the gypsum is 5-8: 1, and the low-hydrothermal-content gelling agent is prepared by mixing and grinding the quartz powder and the gypsum. The quartz powder has weak activity and low water absorption, can be used as a gelling agent to replace part of cement matrix, can solve the problems of larger water demand and higher hydration heat of a concrete system, reduces the cracking sensitivity of the concrete, maintains a system volume stabilizer, and improves the durability of the system.
Preferably, the micro-filler is sulphoaluminate cement and polypropylene micro-powder, the mass ratio of the sulphoaluminate cement to the polypropylene micro-powder is 5-10: 1, the micro-filler can effectively compensate the shrinkage of the concrete, and the micro-filler is matched with other raw materials to avoid the cracking of the fair-faced concrete and improve the durability of the fair-faced concrete.
Preferably, the particle size of the polypropylene micropowder is 1-50 μm.
Preferably, the granulated blast furnace slag powder is S95 grade slag powder. Compared with S105 slag powder, the S95 slag powder has lower activity, more space is provided for accommodating the volume increase of the micro filler in the shrinkage process of the concrete system, so that the micro filler is in more contact with the concrete system, the system is compact, a network is formed, and cracks are prevented.
Preferably, the zeolite powder has a particle size of 0.1-60 μm, and the limestone powder with low activity can inhibit system shrinkage to a certain extent, improve the workability of concrete, improve the durability of concrete, and reduce cracking sensitivity, but is only used as a supplement for the micro-filler due to the unavoidable shrinkage of the concrete system.
The invention utilizes the micro-expansion effect generated in the curing process of the micro-filler to combine with the granulated blast furnace slag powder existing in an amorphous glass body structure, so that the granulated blast furnace slag powder can contain the increased volume generated by the micro-filler in the shrinkage process of a system, thereby forming a cross-combined network, compacting the system, preventing the generation of cracks and improving the durability.
Compared with the prior art, the invention has the beneficial effects that:
when the formula of the fair-faced concrete is adopted for construction, the building construction is carried out on the premise of having the conventional fair-faced concrete construction means, the obtained fair-faced concrete structure has very excellent anti-cracking performance and durability, the working performance and the apparent quality of the concrete can be improved on the premise of the construction, the fair-faced concrete structure has the performance of 'interior and exterior beauty', and the development of the fair-faced concrete technology is further promoted.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The clear water concrete with high crack resistance and durability is prepared from the following raw materials:
the cement is ordinary Portland cement (P.O) with the strength grade of 42.5 Mpa;
the ground granulated blast furnace slag powder adopts S95-grade slag powder;
the quartz powder adopts common quartz powder with 100-320 meshes;
the gypsum adopts commercially available common building material gypsum powder;
the sulphoaluminate cement adopts clinker taking anhydrous calcium sulphoaluminate and dicalcium silicate as main mineral components; the polypropylene micro powder is a polypropylene micro powder product with the grain diameter of 1-50 mu m;
the zeolite powder is zeolite powder with the particle size of 0.1-60 mu m;
the admixture selects high-performance polycarboxylic acid water reducing agent;
the stone coarse material adopts continuous grading limestone coarse material, and the particle size is 5-10 mm; the medium sand fine material is a continuous grading medium river sand fine material, the fineness modulus is 2.5-2.8, the mud content is less than 0.5%, and both the coarse material and the fine material meet the regulations of Fair-faced concrete application technical Specifications;
the water is neutral drinking water tested by acid-base.
Example 1: the clear water concrete with high crack resistance and durability is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 140 parts of cement, 400 parts of stone coarse material, 400 parts of medium sand fine material, 65 parts of low hydrothermal gelling agent, 40 parts of micro filler, 40 parts of granulated blast furnace slag powder, 20 parts of zeolite powder, 3 parts of additive and 90 parts of water.
The low hydrothermal gelling agent described in this embodiment is composed of quartz powder and gypsum, and the mass ratio of the low hydrothermal gelling agent is 7: 1, mixing and grinding quartz powder and gypsum to obtain the product; the quartz powder has weak activity and low water absorption, can be used as a gelling agent to replace part of cement matrix, can solve the problems of larger water demand and higher hydration heat of a concrete system, reduces the cracking sensitivity of the concrete, maintains a system volume stabilizer, and improves the durability of the system. The micro-filler is sulphoaluminate cement and polypropylene micro-powder, the mass ratio of the sulphoaluminate cement to the polypropylene micro-powder is 8: 1, the micro-filler can effectively compensate the shrinkage of the concrete, and the micro-filler is matched with other raw materials to avoid the cracking of the fair-faced concrete and improve the durability of the fair-faced concrete.
The clear water concrete with high crack resistance and durability of the embodiment is prepared from the following raw materials: the cement is ordinary Portland cement (P.O) with the strength grade of 42.5 Mpa; the ground granulated blast furnace slag powder adopts S95-grade slag powder; the quartz powder adopts common quartz powder with 100-320 meshes; the gypsum adopts commercially available common building material gypsum powder; the sulphoaluminate cement adopts clinker taking anhydrous calcium sulphoaluminate and dicalcium silicate as main mineral components; the polypropylene micro powder is a polypropylene micro powder product with the grain diameter of 1-50 mu m; the zeolite powder is zeolite powder with the particle size of 0.1-60 mu m; the admixture selects high-performance polycarboxylic acid water reducing agent; the stone coarse material adopts continuous grading limestone coarse material, and the particle size is 5-10 mm; the medium sand fine material is a continuous grading medium river sand fine material, the fineness modulus is 2.5-2.8, the mud content is less than 0.5%, and both the coarse material and the fine material meet the regulations of Fair-faced concrete application technical Specifications; the water is neutral drinking water tested by acid-base.
Example 2: the clear water concrete with high crack resistance and durability is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 100 parts of cement, 350 parts of stone coarse material, 350 parts of medium sand fine material, 50 parts of low hydrothermal gelling agent, 30 parts of micro filler, 30 parts of granulated blast furnace slag powder, 10 parts of zeolite powder, 2 parts of additive and 80 parts of water.
The low hydrothermal gelling agent in the embodiment is composed of quartz powder and gypsum, the mass ratio of the quartz powder to the gypsum is 5: 1, and the low hydrothermal gelling agent is prepared by mixing and grinding the quartz powder and the gypsum; the micro-filler is sulphoaluminate cement and polypropylene micro-powder, and the mass ratio of the sulphoaluminate cement to the polypropylene micro-powder is 5: 1. The specification of the raw materials used in this example was the same as in example 1.
Example 3: the clear water concrete with high crack resistance and durability is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 180 parts of cement, 450 parts of stone coarse material, 450 parts of medium sand fine material, 80 parts of low hydrothermal gelling agent, 50 parts of micro filler, 50 parts of granulated blast furnace slag powder, 30 parts of zeolite powder, 5 parts of additive and 100 parts of water.
The low hydrothermal gelling agent in the embodiment is composed of quartz powder and gypsum, the mass ratio of the quartz powder to the gypsum is 8: 1, and the low hydrothermal gelling agent is prepared by mixing and grinding the quartz powder and the gypsum; the micro-filler is sulphoaluminate cement and polypropylene micro-powder, and the mass ratio of the sulphoaluminate cement to the polypropylene micro-powder is 10: 1. The specification of the raw materials used in this example was the same as in example 1.
Example 4: the clear water concrete with high crack resistance and durability is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 160 parts of cement, 380 parts of stone coarse material, 420 parts of medium sand fine material, 60 parts of low hydrothermal gelling agent, 35 parts of micro filler, 45 parts of granulated blast furnace slag powder, 15 parts of zeolite powder, 4 parts of additive and 95 parts of water.
The low hydrothermal gelling agent in the embodiment is composed of quartz powder and gypsum, the mass ratio of the quartz powder to the gypsum is 6: 1, and the low hydrothermal gelling agent is prepared by mixing and grinding the quartz powder and the gypsum; the micro-filler is sulphoaluminate cement and polypropylene micro-powder, and the mass ratio of the sulphoaluminate cement to the polypropylene micro-powder is 6: 1. The specification of the raw materials used in this example was the same as in example 1.
Comparative example 1: the clear water concrete with high crack resistance and durability is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 140 parts of cement, 400 parts of stone coarse material, 400 parts of medium sand fine material, 65 parts of low hydrothermal gelling agent, 40 parts of granulated blast furnace slag powder, 20 parts of zeolite powder, 3 parts of additive and 90 parts of water.
The low hydrothermal gelling agent in the embodiment is composed of quartz powder and gypsum, the mass ratio of the quartz powder to the gypsum is 7: 1, and the low hydrothermal gelling agent is prepared by mixing and grinding the quartz powder and the gypsum. The specification of the raw materials used in this example was the same as in example 1.
Comparative example 2: the clear water concrete with high crack resistance and durability is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 140 parts of cement, 400 parts of stone coarse material, 400 parts of medium sand fine material, 65 parts of low hydrothermal gelling agent, 40 parts of micro filler, 20 parts of zeolite powder, 3 parts of additive and 90 parts of water.
The low hydrothermal gelling agent described in this embodiment is composed of quartz powder and gypsum, and the mass ratio of the low hydrothermal gelling agent is 7: 1, mixing and grinding quartz powder and gypsum to obtain the product; the micro-filler is sulphoaluminate cement and polypropylene micropowder, and the mass ratio of the sulphoaluminate cement to the polypropylene micropowder is 8: 1. the specification of the raw materials used in this example was the same as in example 1.
Comparative example 3: the clear water concrete with high crack resistance and durability is prepared by combining the following raw materials: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 140 parts of cement, 400 parts of stone coarse material, 400 parts of medium sand fine material, 65 parts of low hydrothermal gelling agent, 20 parts of zeolite powder, 3 parts of additive and 90 parts of water.
The low hydrothermal gelling agent in the embodiment is composed of quartz powder and gypsum, the mass ratio of the quartz powder to the gypsum is 7: 1, and the low hydrothermal gelling agent is prepared by mixing and grinding the quartz powder and the gypsum. The specification of the raw materials used in this example was the same as in example 1.
The specific formulations of the ratios used in examples 1-4 and comparative example-3 are shown in the following table.
According to analysis of a square and round anti-cracking test, the mortar formed in the examples 1-4 and the comparative examples 1-3 is placed in a square and round anti-cracking mold, the surface of the mortar is ground to be flat, the mold is removed after one day, the models of the examples 1-4 and the comparative examples 1 and 2 are subjected to standard maintenance for three days, then the models are transferred into an oven to be forcedly cracked at the temperature of 110 ℃, and the anti-cracking test mold forming test piece has the outer diameter of 370 +/-1 mm, the inner diameter of 300 +/-1 mm and the height of 140 +/-1 mm. The cracking condition was observed at all times during the period, the length and width of the crack were measured with an electronic vernier caliper, and the recorded results are shown in the following table.
Examples 1 to 4 and comparative examples 1 to 3 were subjected to a drying shrinkage test in accordance with the specification of GB/T50082-2009. The test results are shown in the following table.
Although preferred embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The clear concrete with high crack resistance and durability is characterized by being prepared from the following raw materials in combination: cement, stone coarse material, medium sand fine material, low hydrothermal gelling agent, micro-filler, granulated blast furnace slag powder, zeolite powder and water; the weight parts of the raw materials are as follows: 100-180 parts of cement, 450 parts of stone coarse material, 450 parts of medium sand fine material, 50-80 parts of low hydrothermal gelling agent, 30-50 parts of micro-filler, 30-50 parts of granulated blast furnace slag powder, 10-30 parts of zeolite powder, 2-5 parts of admixture and 80-100 parts of water.
2. The fair-faced concrete with high crack resistance and durability as claimed in claim 1, wherein: the cement is ordinary portland cement; the stone coarse material is continuous grading limestone coarse material, and the particle size is 5-10 mm; the medium sand fine material is continuous grading medium river sand fine material, the fineness modulus is 2.5-2.8, and the mud content is less than 0.5%.
3. The fair-faced concrete with high crack resistance and durability as claimed in claim 1, wherein: the low-hydrothermal gelling agent is prepared by mixing and grinding quartz powder and gypsum according to the mass ratio of 5-8: 1.
4. The fair-faced concrete with high crack resistance and durability as claimed in claim 1, wherein: the micro-filler is sulphoaluminate cement and polypropylene micro-powder, and the mass ratio of the sulphoaluminate cement to the polypropylene micro-powder is 5-10: 1.
5. The fair-faced concrete with high crack resistance and durability as claimed in claim 4, wherein: the particle size of the polypropylene micro powder is 1-50 μm.
6. The fair-faced concrete with high crack resistance and durability as claimed in claim 1, wherein: the granulated blast furnace slag powder is S95-grade slag powder.
7. The fair-faced concrete with high crack resistance and durability as claimed in claim 1, wherein: the particle size of the zeolite powder is 0.1-60 mu m.
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