CN113321452B - Fiber-toughened concrete and preparation method thereof - Google Patents
Fiber-toughened concrete and preparation method thereof Download PDFInfo
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- CN113321452B CN113321452B CN202110576791.2A CN202110576791A CN113321452B CN 113321452 B CN113321452 B CN 113321452B CN 202110576791 A CN202110576791 A CN 202110576791A CN 113321452 B CN113321452 B CN 113321452B
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/26—Wood, e.g. sawdust, wood shavings
- C04B18/265—Wood, e.g. sawdust, wood shavings from specific species, e.g. birch
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to the field of concrete, in particular to fiber toughened concrete and a preparation method thereof. The fiber toughened concrete is prepared from a concrete mixture, wherein the concrete mixture comprises the following components: cement, water, slag powder, a silane coupling agent, coarse aggregate, sodium lignosulfonate, a molasses water reducing agent, polypropylene fiber and cellulose acetate; the preparation method comprises the following steps: step 1): stirring and mixing water, a silane coupling agent, sodium lignosulfonate, a molasses water reducing agent, polypropylene fibers and cellulose acetate to obtain a first mixed material; step 2): stirring and mixing the first mixed material with cement and slag powder to obtain a second mixed material; step 3): and stirring and mixing the second mixed material and the coarse aggregate to obtain a finished product. The product of this application has the toughness that improves the concrete for the difficult cracked advantage of concrete.
Description
Technical Field
The application relates to the field of concrete, in particular to fiber toughened concrete and a preparation method thereof.
Background
Concrete in a broad sense is generally artificial stone prepared from a cementing material, coarse and fine aggregates, water and other additives according to a proper proportion. The material is a widely applied basic material in building engineering by virtue of the advantages of abundant raw materials, low cost, high plasticity, good durability and the like.
The cement concrete is a brittle material, relatively speaking, its tensile strength is little, rupture strength is low, deformability is poor, and cement concrete is placed in the open air after the casting shaping generally, through long-term the back of using, the condition such as fracture easily takes place for brittle concrete to make the building of putting up by the concrete collapse easily, very dangerous, consequently still need improving.
Disclosure of Invention
In order to improve the toughness of concrete and enable the concrete not to be easily broken, the application provides fiber toughened concrete and a preparation method thereof.
In a first aspect, the present application provides a fiber-toughened concrete, which adopts the following technical scheme:
the fiber toughened concrete is prepared from a concrete mixture, wherein the concrete mixture comprises the following components in parts by weight:
cement: 272 portion and 307 portion;
water: 140 portions of 128-;
slag powder: 143 and 176 parts;
silane coupling agent: 1-3 parts;
coarse aggregate: 1100-1235 parts;
sodium lignosulfonate: 2.5-4.0 parts;
molasses water reducing agent: 1.8-3.2 parts;
polypropylene fiber: 23-32 parts;
cellulose acetate; 12-18 parts.
By adopting the technical scheme, under the common cooperation of the molasses water reducing agent, the silane coupling agent, the polypropylene fiber and the cellulose acetate, the cement can be better mixed with other raw materials, various raw materials are more firmly combined together, the toughness of the concrete is improved, and the concrete is not easy to crack.
Specifically, the inventor guesses that after the molasses water reducing agent, the polypropylene fiber and the cellulose acetate are mixed, the molasses water reducing agent can improve the dispersibility of various raw materials and reduce the agglomeration phenomenon of the various raw materials, and the molasses water reducing agent can have certain influence on the polypropylene fiber and the cellulose acetate, so that the polypropylene fiber and the cellulose acetate are better interwoven to form an intricate and complex net-shaped structure, and then the formed net-shaped structure is matched with other raw materials together, so that the various raw materials are more closely matched, and meanwhile, the toughness is also improved.
Secondly, the silane coupling agent is used for connecting organic matters and inorganic matters to form a net structure, the cellulose acetate belongs to the organic matters, the cement belongs to the inorganic matters, and another net structure is formed among the silane coupling agent, the cellulose acetate and the cement, so that the connection among various raw materials is further enhanced, and the generated concrete is not easy to crack due to brittleness.
Finally, when cracks are generated in the concrete, the polypropylene fibers and the cellulose acetate consume part of energy when the cracks are generated in the concrete due to the toughness of the polypropylene fibers and the cellulose acetate, so that the cracks are not easily generated in the concrete. The molasses water reducing agent improves the dispersibility of the polypropylene fiber and the cellulose acetate, so that the toughness of the concrete is improved, and the concrete is not easy to crack.
Preferably, the concrete mixture also comprises 9 to 16 parts by weight of kapok fiber.
Through adopting above-mentioned technical scheme, under the common cooperation of molasses water reducing agent and kapok fibre, further strengthened network structure's intensity to the toughness of concrete has been improved, the difficult fracture because of the fragility of concrete.
Preferably, the concrete mixture also comprises 0.8 to 1.3 parts by weight of FDN-1 high-efficiency water reducing agent.
By adopting the technical scheme, under the matching of the FDN-1 high-efficiency water reducing agent and the molasses water reducing agent, the FDN-1 high-efficiency water reducing agent can possibly enhance certain properties of the molasses water reducing agent, and further improves the influence effect of the molasses water reducing agent on polypropylene fibers and cellulose acetate, so that the toughness of concrete prepared from concrete mixture is enhanced, and the concrete is not easy to crack.
Preferably, the coarse aggregate is crushed gravel with the average particle size of 6-12 mm.
By adopting the technical scheme, the broken gravel in the size range can improve the mechanical strength of the generated concrete and reduce the brittleness.
Preferably, the silane coupling agent is vinyl trimethoxy silane.
By adopting the technical scheme, the vinyl trimethoxy silane is used, so that the vinyl trimethoxy silane can be better matched with cellulose acetate and cement, and the toughness of concrete is further enhanced.
In a second aspect, the present application provides a method for preparing fiber-toughened concrete, which adopts the following technical scheme: a preparation method of fiber toughened concrete comprises the following steps:
step 1): stirring and mixing water, a silane coupling agent, sodium lignosulphonate, a molasses water reducing agent, polypropylene fibers and cellulose acetate at the stirring temperature of 58-70 ℃ to obtain a first mixed material;
step 2): stirring and mixing the first mixed material, cement and slag powder at the mixing temperature of 35-48 ℃ to obtain a second mixed material;
step 3): and stirring and mixing the second mixed material and the coarse aggregate to obtain a finished product.
By adopting the technical scheme, the first mixed material is prepared firstly, so that the molasses water reducing agent, the polypropylene fiber and the cellulose acetate are contacted and matched more fully, and the subsequent mixed material is conveniently and fully matched with other raw materials; under the condition of specific stirring temperature and mixing temperature, various raw materials can be better matched, so that the toughness of the concrete is improved.
Preferably, in the step 1), 9 to 16 parts by weight of kapok fiber is also added.
By adopting the technical scheme, the kapok fiber is added in the step 1), and can be better and more fully matched with the molasses water reducing agent, so that the toughness of the concrete is further improved.
Preferably, in the step 1), 0.8 to 1.3 parts by weight of FDN-1 high-efficiency water reducing agent is also added.
By adopting the technical scheme, the FDN-1 high-efficiency water reducing agent is added in the step 1), and can be better and more fully matched with the molasses water reducing agent, so that the performance of the molasses water reducing agent is further improved, and the toughness of concrete is further improved.
In summary, the present application has the following beneficial effects:
1. under the common cooperation of the silane coupling agent, the polypropylene fiber, the cellulose acetate and the molasses water reducing agent, the cement can be better mixed with other raw materials, various raw materials are more firmly combined together, the toughness of the concrete is improved, and the concrete is not easy to crack.
2. Under the common cooperation of the molasses water reducing agent and the kapok fiber, the strength of the net structure is further enhanced, so that the toughness of the concrete is improved, and the concrete is not easy to crack due to brittleness.
3. Under the matching of the FDN-1 high-efficiency water reducing agent and the molasses water reducing agent, the FDN-1 high-efficiency water reducing agent can possibly enhance certain properties of the molasses water reducing agent, and further improves the influence effect of the molasses water reducing agent on polypropylene fibers and cellulose acetate, so that the toughness of concrete prepared from the concrete mixture is enhanced, and the concrete is not easy to crack.
Detailed Description
The present application will be described in further detail with reference to examples.
The information on the source of the raw materials used in the following examples and comparative examples is detailed in Table 1.
TABLE 1
| Raw materials | Model number | Source information |
| Cement | Water glass type | Lin Yi Yun Yiyin refractory Co Ltd |
| Slag powder | S95 | Tangshan Industrial building materials Co Ltd |
| Lignosulfonic acid sodium salt | 0-15961 | Chemical Co Ltd of Jinan Monghun |
| Molasses water reducing agent | CYX molasses | Jinan Supper-Italian chemical Co Ltd |
| Polypropylene fiber | YBH-polypropylene anti-crack fiber | Jinan Yun Baihui Biotech Co Ltd |
| Cellulose acetate | / | Conditis chemical industry (Hubei) Co Ltd |
| Kapok fiber | / | Shandong Xuzheng textile Co Ltd |
| FDN-1 high-efficiency water reducing agent | Hunter brand | Novel building material factory for gloriosa in Changsha Tianxin district |
| Vinyl trimethoxy silane | Silane coupling agent YDH171 | Wuhan Jixin Yibang Biotech Co., Ltd |
| Vinyl triethoxy silane | / | Hubei Kovode chemical Co Ltd |
| Amino silane | / | Shandong Huanyang chemical Co Ltd |
Examples
Examples 1 to 3
The preparation method of the fiber toughened concrete comprises the following steps:
step 1): stirring water, a silane coupling agent, sodium lignosulphonate, a molasses water reducing agent, polypropylene fibers and cellulose acetate for 8 minutes at a specified stirring temperature and at a rotating speed of 135r/min, and uniformly mixing to obtain a first mixed material.
Step 2): and stirring the first mixed material, cement and slag powder for 6 minutes at a specified mixing temperature and at a rotation speed of 68r/min, and uniformly mixing to obtain a second mixed material.
Step 3): and stirring the second mixture and the coarse aggregate for 6 minutes at normal temperature and at the rotating speed of 72r/min, and uniformly mixing to obtain a finished product.
The amounts of the respective raw materials to be charged, the stirring temperature and the mixing temperature are specifically shown in Table 2. The average particle size of the coarse aggregate was in the range of 6 to 12mm, as shown in Table 2.
The silane coupling agent is one of vinyl triethoxysilane, amino silane and vinyl trimethoxy silane.
TABLE 2
Examples 4 to 6
The fiber-toughened concrete is different from the concrete in example 3 in that kapok fiber is also added in the step 1), and the specific adding amount of the kapok fiber is shown in table 3 in detail.
TABLE 3
| Item | Example 4 | Example 5 | Example 6 |
| Input amount (kg) | 9 | 16 | 12 |
Examples 7 to 9
The fiber toughened concrete is different from the concrete in the embodiment 3 in that in the step 1), an FDN-1 high-efficiency water reducing agent is also added, and the adding amount of the FDN-1 high-efficiency water reducing agent is detailed in a table 4.
TABLE 4
| Item | Example 7 | Example 8 | Example 9 |
| Input amount (kg) | 0.8 | 1.1 | 1.3 |
Example 10
A fiber-reinforced concrete, which is different from that of example 3 in that the coarse aggregate is crushed gravel having an average particle size of 15 mm.
Example 11
The difference between the fiber toughened concrete and the concrete in the embodiment 6 is that 1.3kg of FDN-1 high-efficiency water reducing agent is also added in the step 1).
Comparative example
Comparative example 1
A fiber-reinforced concrete, which is different from that of example 3 in that a molasses water reducing agent was replaced with an equal amount of crushed gravel having an average particle size of 9 mm.
Comparative example 2
A fiber-reinforced concrete, which is different from that of example 3 in that polypropylene fibers were replaced with the same amount of crushed gravel having an average particle size of 9 mm.
Comparative example 3
A fiber-reinforced concrete, which is different from example 3 in that cellulose acetate was replaced with the same amount of crushed gravel having an average particle diameter of 9 mm.
Performance test
1. And (3) detecting the splitting tensile strength: the concrete obtained in examples 1 to 11 and comparative examples 1 to 3 was tested according to GB/T50081-2019 "test method Standard for physical and mechanical Properties of concrete", and the obtained concrete was prepared into cubic test pieces of 150mm x 150 mm.
2. And (3) elastic modulus detection: the concrete obtained in examples 1 to 11 and comparative examples 1 to 3 was tested according to GB/T50081-2019 "test method Standard for physical and mechanical Properties of concrete", and the obtained concrete was prepared into prismatic test pieces of 150mm x 300 mm.
3. And (3) detecting the breaking strength: the concrete obtained in examples 1 to 11 and comparative examples 1 to 3 was tested according to GB/T50081-2019 "test method Standard for physical and mechanical Properties of concrete", and the obtained concrete was prepared into prismatic test pieces of 150mm x 550 mm.
4. And (3) detecting the bending toughness: the concrete obtained in examples 1 to 11 and comparative examples 1 to 3 was tested according to CECS13:2009 Standard for testing methods for fiber concrete, and the obtained concrete was fabricated into beam test pieces of 150mm by 550 mm.
5. And (3) detecting the compressive strength: the concrete obtained in examples 1 to 11 and comparative examples 1 to 3 was tested according to GB/T50081-2019 "test method Standard for physical and mechanical Properties of concrete", and the obtained concrete was prepared into cubic test pieces of 150mm x 150 mm.
The specific assay data for experiments 1-5 are detailed in tables 5-8.
TABLE 5
As can be seen from the comparison of the data in Table 5 between examples 1-3 and comparative examples 1-3, the data for each of examples 1-3 is better than that for comparative examples 1-3, indicating that the toughness of the concrete produced in examples 1-3 is better than that of comparative examples 1-3.
The inventor guesses that under the co-compounding of the silane coupling agent, the polypropylene fiber and the cellulose acetate, certain properties of the cement can be influenced, so that the toughness of the generated concrete is enhanced. Meanwhile, the molasses water reducer, the polypropylene fibers and the cellulose acetate are mixed to possibly influence the polypropylene fibers and the cellulose acetate, so that the polypropylene fibers and the cellulose acetate are better interwoven, various raw materials are more closely matched, and the toughness is further improved.
TABLE 6
As can be seen from the comparison of the data in Table 6 between example 3 and examples 4-6, the data in examples 4-6 are better than that in example 3, indicating that the concrete made with kapok fiber has better toughness and is relatively less prone to cracking. The inventor guesses that the combination of the molasses water reducing agent and the kapok fiber can effectively improve the toughness of the concrete.
TABLE 7
According to the comparison of the data of the example 3 and the data of the examples 7-9 in the table 7, the data of the examples 7-9 are all superior to those of the example 3, which shows that the toughness of the prepared concrete is improved and the concrete is not easy to crack after the FDN-1 high efficiency water reducing agent is added. Probably in the matching of the FDN-1 high-efficiency water reducing agent and the molasses water reducing agent, the FDN-1 high-efficiency water reducing agent strengthens certain properties of the molasses water reducing agent, and further improves the influence effect of the molasses water reducing agent on polypropylene fibers and cellulose acetate, thereby strengthening the toughness of the generated concrete and ensuring that the concrete is not easy to crack.
TABLE 8
As can be seen from the comparison of the data of example 3 and example 10 in Table 8, the data of example 10 is slightly inferior to that of example 3, which shows that when crushed gravel having an average particle size of 6 to 12mm is used, the resulting concrete has good toughness and is not prone to cracking.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (5)
1. The fiber toughened concrete is characterized by being prepared from a concrete mixture, wherein the concrete mixture comprises the following components in parts by weight:
cement: 272 portion and 307 portion;
water: 140 portions of 128-;
slag powder: 143 and 176 parts;
silane coupling agent: 1-3 parts;
coarse aggregate: 1100-1235 parts;
sodium lignosulfonate: 2.5-4.0 parts;
molasses water reducing agent: 1.8-3.2 parts;
polypropylene fiber: 23-32 parts;
cellulose acetate: 12-18 parts;
the preparation method of the fiber toughened concrete comprises the following steps:
step 1): stirring and mixing water, a silane coupling agent, sodium lignosulphonate, a molasses water reducing agent, polypropylene fibers and cellulose acetate at the stirring temperature of 58-70 ℃ to obtain a first mixed material;
step 2): stirring and mixing the first mixed material, cement and slag powder at the mixing temperature of 35-48 ℃ to obtain a second mixed material;
step 3): and stirring and mixing the second mixed material and the coarse aggregate to obtain a finished product.
2. The fiber-toughened concrete according to claim 1, wherein: the concrete mixture also comprises 9-16 parts by weight of kapok fiber;
and is charged in the step 1).
3. The fiber-toughened concrete according to claim 1, wherein: the concrete mixture also comprises 0.8 to 1.3 weight parts of FDN-1 high-efficiency water reducing agent;
and is charged in the step 1).
4. The fiber-toughened concrete according to claim 1, wherein: the coarse aggregate is broken gravel with the average grain diameter of 6-12 mm.
5. The fiber-toughened concrete according to claim 1, wherein: the silane coupling agent is vinyl trimethoxy silane.
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| CN104310892A (en) * | 2014-10-15 | 2015-01-28 | 上海理工大学 | Preparation method of polypropylene fiber concrete |
| CN105198353A (en) * | 2015-11-04 | 2015-12-30 | 南京晟林再生资源有限公司 | Impact-resistant and anti-cracking concrete aggregate |
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