CN114890745A - High-strength high-crack-resistance hydraulic anti-abrasion concrete and preparation method thereof - Google Patents
High-strength high-crack-resistance hydraulic anti-abrasion concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 122
- 238000005299 abrasion Methods 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 239000010881 fly ash Substances 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 238000010276 construction Methods 0.000 claims abstract description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 19
- 239000011398 Portland cement Substances 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000010438 granite Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229920001410 Microfiber Polymers 0.000 claims description 4
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 4
- 239000003658 microfiber Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000010754 BS 2869 Class F Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- 238000007580 dry-mixing Methods 0.000 claims description 2
- 239000004574 high-performance concrete Substances 0.000 claims description 2
- 239000011372 high-strength concrete Substances 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000012615 aggregate Substances 0.000 abstract 4
- 239000007788 liquid Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- C04B28/04—Portland 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
-
- 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
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- 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 relates to high-strength high-crack-resistance hydraulic anti-abrasion concrete and a preparation method thereof, wherein the raw materials comprise the following components in percentage by weight of each concrete: 125-138 kg/m water 3 272-315 kg/m of cement 3 68.1-78.9 kg/m of fly ash 3 0.9kg/m of fiber 3 27.3-28.6 kg/m silicon powder 3 And fine aggregate 738-764 kg/m 3 And 1137-1178 kg/m of coarse aggregate 3 2.94-4.73 kg/m of water reducing agent 3 0.0257-0.0591 kg/m of air entraining agent 3 (ii) a Firstly, sequentially adding coarse aggregate, cement, fly ash, silicon powder, fine aggregate and fiber into a stirrer, uniformly stirring for 60-80 s, simultaneously adding a water reducing agent and an air entraining agent into mixing water, uniformly mixing, slowly adding the mixed liquid into the mixed material within 10s, and fully mixing and stirring for 90-120 s to obtain high-strength high-crack-resistance hydraulic anti-abrasion concrete; the invention has high strength and excellent anti-abrasion performanceThe anti-cracking performance is good, and the construction cost of enterprises and the later operation and maintenance cost are greatly reduced.
Description
Technical Field
The invention belongs to the technical field of hydraulic concrete, and particularly relates to high-strength high-crack-resistance hydraulic abrasion-resistant concrete and a preparation method thereof.
Background
With the rapid development of water conservancy and hydropower construction in China, large hydropower stations with large storage capacities and high water heads are increasing. These hydropower stations all have the characteristics of high water head, large flow and high bed load, wherein the hydraulic work water outlet building is easily subjected to long-term repeated scouring and abrasion of silt-containing and stone-containing high-speed water flow, so that the phenomena of abrasion and cavitation of hydraulic work concrete are caused, and the service life of the building is shortened. According to the investigation report about the damage condition of hydraulic structures, about 70 percent of the built large and medium-sized hydroelectric projects have scouring and cavitation damage. Therefore, the problems of safe flood discharge, full energy dissipation, reduction of downstream scouring and the like of the water discharge structure are solved. Meanwhile, in the conventional hydraulic abrasion-resistant concrete, the higher strength requires the larger cement content in the concrete, so that the concrete is easy to crack when being constructed in a large volume, the hydration heat is intensively released, the temperature rise of the concrete is higher, and the temperature difference between the inside and the outside of the concrete is larger. Therefore, the problems of the volume stability and the crack resistance of the anti-abrasion concrete caused by construction are also urgently needed to be solved.
At present, in order to improve the abrasion resistance and crack resistance of abrasion resistant concrete, technicians adopt a plurality of materials, such as organic epoxy resin, furan resin, acrylate resin, unsaturated polyester resin mortar and the like, but the materials are frequently damaged under the action of sand-containing water flow with the flow rate of more than 30 m/s. The inorganic admixture mainly comprises fly ash, silicon powder and the like, the main current technical scheme is to obtain higher anti-abrasion strength by improving the compressive strength of concrete basically, and practice proves that the anti-abrasion performance can be obviously improved. However, engineering practice shows that concrete with higher strength grade, especially when large-volume concrete is constructed, the concentrated heat release of the concrete is higher, the crack resistance is poorer, and the later durability of the concrete is directly influenced due to more cracks of the concrete, so that higher requirements are provided for the construction process. In summary, the high strength and the high crack resistance of the concrete seem to be a pair of contradictory indexes, and no good solution is found at present when the preparation of the high strength, high crack resistance and abrasion resistance concrete is required.
Therefore, research and development of high-strength, high-crack-resistance and abrasion-resistant concrete are necessary.
Disclosure of Invention
In order to solve the technical problems, the invention innovatively designs the high-strength high-crack-resistance hydraulic anti-abrasion concrete and the preparation method thereof, the concrete has the advantages of good construction performance, mechanical property, volume stability and the like, and remarkable technical and economic benefits, can effectively solve the abrasion damage of the concrete, simultaneously improves the crack resistance of the concrete, reduces the large-volume construction difficulty of the concrete, and greatly reduces the construction cost of enterprises and the later operation and maintenance cost.
The technical scheme adopted by the invention is as follows:
the high-strength high-crack-resistance hydraulic anti-abrasion concrete comprises the following raw materials in percentage by weight of concrete: water: 125 to 138kg/m 3 (ii) a Cement: 272 to 315kg/m 3 (ii) a Fly ash: 68.1-78.9 kg/m 3 (ii) a Fiber: 0.8-1.0kg/m 3 (ii) a Silicon powder: 27.3 to 28.6kg/m 3 (ii) a Fine aggregate: 738 to 764kg/m 3 (ii) a Coarse aggregate: 1137-1178 kg/m 3 (ii) a Water reducing agent: 2.94-4.73 kg/m 3 (ii) a Air entraining agent: 0.0257-0.0591 kg/m 3 。
In the invention, the cement is 52.5 grade P.I type portland cement, and the ratio of the P.I type portland cement to the Portland cementThe surface area is more than or equal to 430kg/m 3 The other corresponding technical indexes meet the requirements of 'general portland cement' GB 175-2007.
In the invention, the fly ash meets the technical index requirements of class F I fly ash in the technical Specification DL/T5055-2017 for blending fly ash in hydraulic concrete.
In the invention, the silicon powder meets the technical index requirements of GB/T18736-2017 mineral admixture for high-strength and high-performance concrete.
In the invention, the fiber is polymer microfiber, the diameter of the fiber is 11-30 μm, and the length of the fiber is 18-22 mm.
According to the invention, the coarse aggregate is prepared by mixing 5: 5 of two lithological aggregates of black granite gneiss and angle-flashing long gneiss, the broken stone is composed of small stones and medium stones, the particle size of the small stones is 5-20 mm, and the particle size of the medium stones is 20-40 mm. The saturated surface dry apparent density of the aggregate is more than or equal to 2700kg/m 3 And the other technical indexes all meet the requirements of 'Hydraulic concrete construction Specification' DL/T5144-2015.
In the invention, the fine aggregate is prepared by mixing 5: 5 of two lithological aggregates of black cloud granite gneiss and angle-flashing long gneiss, the fineness modulus is 2.5-2.8, and other technical indexes meet the requirements of DL/T5144-magnetic 2015 in Hydraulic concrete construction Specification.
In the invention, the water reducing agent is a polycarboxylic acid high-performance water reducing agent or a naphthalene high-efficiency water reducing agent, and the technical index meets the requirements of DL/T5100-2014 in technical Specification for hydraulic concrete admixtures.
In the invention, the air entraining agent is a technical index which meets the requirements of DL/T5100-2014 technical Specification for hydraulic concrete admixtures.
The invention also provides a preparation method of the high-strength high-crack-resistance hydraulic abrasion-resistant concrete, which comprises the following steps:
step 1, using 1137-1178 kg/m of coarse aggregate 3 272-315 kg/m of P, I type portland cement 3 68.1-78.9 kg/m of I-grade fly ash 3 27.3-28.6 kg/m silica powder 3 Fine aggregate 738-764 kg/m 3 0.9kg/m of fiber 3 Sequentially addingAnd (3) uniformly stirring for 60-80 s in a stirrer to fully disperse the fibers, and properly increasing the dry mixing time according to the dispersion difficulty of the fibers to finally obtain a uniform dry-mixed mixture.
Step 2, adding 2.94-4.73 kg/m of water reducing agent 3 And 0.0257-0.0591 kg/m of air entraining agent 3 And mixing water 125-138 kg/m 3 And (4) uniformly mixing.
And 3, starting the stirrer, slowly adding the mixed solution obtained in the step 2 into the dry-mixed mixture obtained in the step 1 within 10 seconds, and fully mixing and stirring for 90-120 seconds to obtain the high-strength high-crack-resistance hydraulic anti-abrasion concrete.
The invention has the following beneficial effects:
1. the abrasion resistance of the concrete is improved. According to the invention, the optimal mixing amount is designed by mixing the microfiber and the silicon powder according to the characteristics and the effects of various materials. The high-activity mixed material silicon powder is added, so that the concrete strength is greatly improved, the concrete rheological property and the microstructure are improved, micro pores in the concrete are effectively filled, the interface bonding force among various materials of the concrete is enhanced, the concrete is more compact, the abrasion resistance of the concrete is obviously improved, and the aggregate is prevented from being stripped from the gelled material slurry under the condition that the concrete is continuously flushed by high-speed water flow.
2. Greatly improves the construction performance and the crack resistance of the concrete. The invention adopts the P.I type portland cement with high strength grade, thereby obviously reducing the total consumption of the cementing material of each concrete, reducing the heat release during the large-volume construction of the concrete and reducing the generation of temperature cracks. Meanwhile, the micro fibers are doped to improve the plastic anti-cracking performance of the concrete, a large number of cracks are often generated due to plastic shrinkage of the concrete in the early hardening stage, the fibers are uniformly distributed in the concrete just like a large number of micro ribs are doped in the concrete, and the fibers distributed in a disorderly way can effectively inhibit the early plastic cracking of the concrete and improve the early anti-cracking performance of the concrete. In addition, the invention adopts two kinds of rocks of the black cloud granite gneiss and the angle-flashing long gneiss as concrete aggregate, greatly improves the ultimate tensile value of the concrete, can effectively resist the shrinkage caused by the environmental drying during the operation of the hardened concrete, and thus obviously improves the crack resistance of the concrete during the operation. The anti-cracking measures greatly reduce the concrete shrinkage caused by the particle effect of the silicon powder.
3. The concrete provided by the invention has the strength grade not lower than C50, can meet the requirements of different construction processes, and comprises two kinds of concrete with different fluidity, namely slump of 50-70 mm or 140-170 mm.
4. The high-strength high-crack-resistance hydraulic anti-abrasion concrete disclosed by the invention is used for buildings with sluices such as water conservancy and hydropower and high-speed flowing water in tunnels, has the advantages of good construction performance, mechanical property, deformation performance, durability and the like, and simultaneously improves the anti-crack performance of the concrete, reduces the large-volume construction difficulty of the concrete, and greatly reduces the construction cost and the later-stage operation and maintenance cost of enterprises.
Detailed Description
The present invention is further illustrated by the following specific examples.
In order to verify the effects of abrasion resistance, cracking resistance and the like of the high-strength high-crack-resistance hydraulic abrasion-resistant concrete, the concrete disclosed by the invention is compared with the existing concrete, the actual examples are numerous, and only the following representative examples are selected in consideration of space content, and are as follows:
example 1
The embodiment provides high-strength high-crack-resistance hydraulic anti-abrasion concrete which comprises the following raw materials:
water: 125kg/m 3 ；
Cement: 294kg/m 3 ；
Fly ash: 73.5kg/m 3 ；
Fiber: 0.9kg/m 3 ；
Fine aggregate: 764kg/m 3 ；
Coarse aggregate: 1178kg/m 3 ；
Water reducing agent: 2.94kg/m 3 ；
Air entraining agent: 0.0257kg/m 3 。
A preparation method of high-strength high-crack-resistance hydraulic anti-abrasion concrete specifically comprises the following steps:
step 1, 1178kg/m of coarse aggregate 3 294kg/m of P.I type portland cement 3 Grade I fly ash 73.5kg/m 3 764kg/m fine aggregate 3 0.9kg/m of fiber 3 And sequentially adding the mixture into a stirrer, and uniformly stirring for 60-80 s to obtain a uniform dry-mixed mixture. Step 2, adding 2.94kg/m of water reducing agent 3 And air entraining agent 0.0257kg/m 3 With mixing water 125kg/m 3 And (4) uniformly mixing. And 3, starting a stirrer, slowly adding the mixed solution obtained in the step 2 into the dry-mixed mixture obtained in the step 1 within 10 seconds, and fully mixing and stirring for 90-120 seconds to obtain the high-strength high-crack-resistance hydraulic anti-abrasion concrete.
The slump of the concrete is between 50 and 70mm, the air content is between 3.5 and 4.5 percent, the concrete is subjected to strength, deformation and abrasion resistance detection according to the Hydraulic concrete test procedure DL/T5150-2017, and the performances are shown in Table 1.
TABLE 1 high-Strength and high-crack-resistance hydraulic anti-abrasion concrete Properties
Example 2
The embodiment provides high-strength high-crack-resistance hydraulic anti-abrasion concrete which comprises the following raw materials:
water: 125kg/m 3 ；
Cement: 272kg/m 3 ；
Fly ash: 68.1kg/m 3 ；
Fiber: 0.9kg/m 3 ；
Silicon powder: 27.2kg/m 3 ；
Fine aggregate: 761kg/m 3 ；
Coarse aggregate: 1174kg/m 3 ；
Water reducing agent: 3.31kg/m 3 ；
Air entraining agent: 0.0257kg/m 3 。
A preparation method of high-strength high-crack-resistance hydraulic anti-abrasion concrete specifically comprises the following steps:
step 1, 1174kg/m of coarse aggregate 3 272kg/m of Portland cement P.I 3 Class I fly ash 68.1kg/m 3 27.2kg/m silicon powder 3 761kg/m of fine aggregate 3 0.9kg/m of fiber 3 And sequentially adding the mixture into a stirrer, and uniformly stirring for 60-80 s to obtain a uniform dry-mixed mixture. Step 2, adding 3.31kg/m of water reducing agent 3 And an air entraining agent 0.0257kg/m 3 With mixing water 125kg/m 3 And (4) uniformly mixing. And 3, starting a stirrer, slowly adding the mixed solution obtained in the step 2 into the dry-mixed mixture obtained in the step 1 within 10 seconds, and fully mixing and stirring for 90-120 seconds to obtain the high-strength high-crack-resistance hydraulic anti-abrasion concrete.
The slump of the concrete is 50-70 mm, the air content is 3.5-4.5%, the concrete is subjected to strength, deformation and abrasion resistance detection according to the Hydraulic concrete test procedure DL/T5150-2017, and the performances are shown in Table 2.
TABLE 2 high-Strength and high-crack-resistance hydraulic anti-abrasion concrete
Example 3
The embodiment provides high-strength high-crack-resistance hydraulic anti-abrasion concrete which comprises the following raw materials:
water: 138kg/m 3 ；
Cement: 315kg/m 3 ；
Fly ash: 78.9kg/m 3 ；
Fiber: 0.9kg/m 3 ；
Fine aggregate: 741kg/m 3 ；
Coarse aggregate: 1142kg/m 3 ；
Water reducing agent: 3.15kg/m 3 ；
Air entraining agent: 0.0591kg/m 3 。
A preparation method of high-strength high-crack-resistance hydraulic anti-abrasion concrete specifically comprises the following steps:
step 1, mixing 1142kg/m coarse aggregate 3 315kg/m of P.I type portland cement 3 Class I fly ash 78.9kg/m 3 741kg/m of fine aggregate 3 0.9kg/m of fiber 3 And sequentially adding the mixture into a stirrer, and uniformly stirring for 60-80 s to obtain a uniform dry-mixed mixture. Step 2, adding 3.15kg/m of water reducing agent 3 And an air entraining agent 0.0591kg/m 3 138kg/m of mixing water 3 And (4) uniformly mixing. And 3, starting a stirrer, slowly adding the mixed solution obtained in the step 2 into the dry-mixed mixture obtained in the step 1 within 10 seconds, and fully mixing and stirring for 90-120 seconds to obtain the high-strength high-crack-resistance hydraulic anti-abrasion concrete.
The slump of the concrete is 140-170 mm, the air content is 3.5-4.5%, the concrete is subjected to strength, deformation and abrasion resistance detection according to the Hydraulic concrete test procedure DL/T5150-2017, and the performances are shown in Table 3.
TABLE 3 high-Strength and high-crack-resistance hydraulic anti-abrasion concrete Properties
Example 4
The embodiment provides high-strength high-crack-resistance hydraulic anti-abrasion concrete which comprises the following raw materials:
water: 138kg/m 3 ；
Cement: 292kg/m 3 ；
Fly ash: 73.0kg/m 3 ；
Fiber: 0.9kg/m 3 ；
Silicon powder: 28.6kg/m 3 ；
Fine aggregate: 738kg/m 3 ；
Coarse aggregate: 1137kg/m 3 ；
Water reducing agent: 4.73kg/m 3 ；
Air entraining agent: 0.0591kg/m 3 。
A preparation method of high-strength high-crack-resistance hydraulic abrasion-resistant concrete specifically comprises the following steps:
step 1, 1137kg/m of coarse aggregate is added 3 292kg/m of P, I type portland cement 3 Grade I fly ash 73.0kg/m 3 28.6kg/m silicon powder 3 738kg/m of fine aggregate 3 0.9kg/m of fiber 3 And sequentially adding the mixture into a stirrer, and uniformly stirring for 60-80 s to obtain a uniform dry-mixed mixture. Step 2, adding 4.73kg/m of water reducing agent 3 And air entraining agent 0.0591kg/m 3 138kg/m of mixing water 3 And (4) uniformly mixing. And 3, starting a stirrer, slowly adding the mixed solution obtained in the step 2 into the dry-mixed mixture obtained in the step 1 within 10 seconds, and fully mixing and stirring for 90-120 seconds to obtain the high-strength high-crack-resistance hydraulic anti-abrasion concrete.
The slump of the concrete is 140-170 mm, the air content is 3.5-4.5%, the concrete is subjected to strength, deformation and abrasion resistance detection according to the Hydraulic concrete test procedure DL/T5150-2017, and the performances are shown in Table 4.
TABLE 4 high-Strength and high-crack-resistance hydraulic anti-abrasion concrete Properties
Comparative example 1
Compared to example 1, no fibres were incorporated.
Comparative example 2
Compared to example 3, no fibres were incorporated.
TABLE 5 abrasion resistance concrete Properties
Compared with the concrete performances of the comparative examples 1-2 and 1, and the concrete performances of the comparative examples 3-4 and 2, the high-strength and high-crack-resistance hydraulic abrasion-resistant concrete of the examples 1-4 of the invention is obviously superior to the concrete corresponding to the comparative examples 1-2 in the aspects of tensile strength, ultimate tensile strength and abrasion resistance. The concrete prepared by the raw materials and the preparation method has high strength, high impact and abrasion resistance and excellent crack resistance. The hydraulic abrasion-resistant concrete is superior to concrete prepared by not doping fiber or silicon powder in the prior art.
The above description is only a part of specific embodiments of the present invention (since the formula of the present invention includes numerical ranges, the embodiments are not exhaustive, and the protection scope of the present invention includes the numerical ranges and other technical essential ranges), and the detailed contents or common knowledge known in the schemes are not described herein too much. It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and it is obvious for those skilled in the art that all the technical solutions obtained by using the equivalent substitution or the equivalent change fall within the protection scope of the present invention. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The high-strength high-crack-resistance hydraulic anti-abrasion concrete is characterized by comprising the following raw materials in parts by weight: water, cement, fly ash, fiber, silica powder, fine aggregate, coarse aggregate, a water reducing agent and an air entraining agent.
2. The concrete according to claim 1, wherein the concrete is a raw material comprising the following components in percentage by weight of the concrete per square: water: 125 to 138kg/m 3 (ii) a Cement: 272 to 315kg/m 3 (ii) a Fly ash: 68.1-78.9 kg/m 3 (ii) a Fiber: 0.8-1.0kg/m 3 (ii) a Silicon powder: 27.3 to 28.6kg/m 3 (ii) a Fine aggregate: 738 to 764kg/m 3 (ii) a Coarse aggregate: 1137-1178 kg/m 3 (ii) a Water reducing agent: 2.94-4.73 kg/m 3 (ii) a Air entraining agent: 0.0257-0.0591 kg/m 3 。
3. The concrete according to claim 2, wherein the cement is a 52.5 grade P-I portland cement,the specific surface area is more than or equal to 430kg/m 3 The other corresponding technical indexes meet the requirements of GB 175-2007 general portland cement.
4. The concrete according to claim 2, wherein the fly ash meets the technical index requirements of class F class I fly ash in the technical Specification for Hydraulic concrete blended fly ash DL/T5055-2017.
5. The concrete as claimed in claim 2, wherein the silica powder meets the technical index requirements of mineral admixture for high-strength and high-performance concrete GB/T18736-2017.
6. The concrete according to claim 2, wherein the fibers are polymer microfibers, and have a fiber diameter of 11 to 30 μm and a length of 18 to 22 mm.
7. The concrete according to claim 2, wherein the coarse aggregate is a mixture of 5: 5 of two lithological aggregates of black granite gneiss and angle-sudden-inclination gneiss, the broken stone is composed of small stones and medium stones, the particle size of the small stones is 5-20 mm, and the particle size of the medium stones is 20-40 mm; the saturated surface dry apparent density of the aggregate is more than or equal to 2700kg/m 3 And the other technical indexes all meet the requirements of 'Hydraulic concrete construction Specification' DL/T5144-2015.
8. The concrete as claimed in claim 2, wherein the fine aggregate is a mixture of two lithologic aggregates (5: 5) of black granite gneiss and angle-sloping long gneiss, the fineness modulus is 2.5-2.8, and the other technical indexes meet the requirements of hydraulic concrete construction Specification DL/T5144-2015.
9. The concrete according to claim 2, wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent or a naphthalene high-efficiency water reducing agent, and the technical index meets the requirements of technical Specification DL/T5100-2014 for hydraulic concrete admixtures; the air entraining agent meets the requirements of DL/T5100-2014 technical Specification for hydraulic concrete admixtures.
10. The method for preparing concrete according to claim 2, which comprises the following steps:
step 1, using 1137-1178 kg/m of coarse aggregate 3 272-315 kg/m of P, I type portland cement 3 68.1-78.9 kg/m of I-grade fly ash 3 27.3-28.6 kg/m silica powder 3 Fine aggregate 738-764 kg/m 3 0.9kg/m of fiber 3 Sequentially adding the mixture into a stirrer, uniformly stirring for 60-80 s to fully disperse fibers, and properly increasing dry mixing time according to the dispersion difficulty of the fibers to finally obtain a uniform dry-mixed mixture;
step 2, adding 2.94-4.73 kg/m of water reducing agent 3 And 0.0257-0.0591 kg/m of air entraining agent 3 And mixing water 125-138 kg/m 3 Mixing uniformly;
and 3, starting the stirrer, slowly adding the mixed solution obtained in the step 2 into the dry-mixed mixture obtained in the step 1 within 10 seconds, and fully mixing and stirring for 90-120 seconds to obtain the high-strength high-crack-resistance hydraulic anti-abrasion concrete.
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