CN111662053A - Polypropylene fiber concrete and preparation method thereof - Google Patents
Polypropylene fiber concrete and preparation method thereof Download PDFInfo
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- CN111662053A CN111662053A CN202010478906.XA CN202010478906A CN111662053A CN 111662053 A CN111662053 A CN 111662053A CN 202010478906 A CN202010478906 A CN 202010478906A CN 111662053 A CN111662053 A CN 111662053A
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- 239000000835 fiber Substances 0.000 title claims abstract description 68
- -1 Polypropylene Polymers 0.000 title claims abstract description 67
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 67
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000004568 cement Substances 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011575 calcium Substances 0.000 claims abstract description 13
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 9
- 239000010754 BS 2869 Class F Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 27
- 230000000694 effects Effects 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 8
- 239000000843 powder Substances 0.000 abstract description 7
- 239000000377 silicon dioxide Substances 0.000 abstract description 7
- 230000003487 anti-permeability effect Effects 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 abstract description 2
- 229910001653 ettringite Inorganic materials 0.000 abstract description 2
- 239000004576 sand Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 238000003756 stirring Methods 0.000 description 6
- 229920005646 polycarboxylate Polymers 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000008030 superplasticizer Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 208000001490 Dengue Diseases 0.000 description 1
- 206010012310 Dengue fever Diseases 0.000 description 1
- 208000032843 Hemorrhage Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 208000025729 dengue disease Diseases 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
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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 provides a polypropylene fiber concrete which does not contain silica powder and has high anti-permeability performance and a preparation method thereof. The polypropylene fiber concrete is prepared from the following raw materials in parts by weight: 155-165 kg/m water3330 to 360kg/m of cement3700 to 710kg/m of fine aggregate31000 to 1040kg/m of coarse aggregate350-90 kg/m of fly ash30.7 to 1.1kg/m of polypropylene fiber330-40 kg/m calcium sulphoaluminate expanding agent36-10 kg/m of water reducing agent3. The internal pores of the concrete are controlled by the proportion of the fine aggregate and the coarse aggregate, and free ettringite crystal particles generated by the expanding agent can further fill the internal pores, so that the compactness of the concrete is improved; meanwhile, the 'screen effect' of the polypropylene fiber can inhibit the micro cracks in the concrete from developing into connected cracks; thereby effectively improving the impermeability of the concrete.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to polypropylene fiber concrete and a preparation method thereof.
Background
The concrete is an artificial stone which is prepared by a cementing material, an aggregate, water and the like according to a certain proportion, and is formed by uniformly stirring, closely forming, maintaining and hardening. In recent years, urban underground spaces in China develop rapidly, basements and outer walls are in damp and water pressure environments for a long time, and common concrete cannot meet corresponding requirements in the environments. Therefore, the waterproof technical specification of underground engineering GB50108-2008 stipulates that: the main structure of the upstream surface of the underground engineering is made of waterproof concrete, and other waterproof measures are taken according to the requirements of waterproof dengue. On the basis of common concrete, the waterproof concrete reduces the porosity inside the concrete or changes the pore form and distribution characteristics by adjusting the mixing proportion, or improving the aggregate gradation, or adding additives, admixtures and the like, thereby improving the compactness and impermeability of the concrete and achieving the aim of waterproofing.
However, although waterproof concrete on the market is wide in variety, the application effect in practical engineering is not ideal. For example, a waterproof concrete is commercially available, which is prepared from materials such as cement, water, sand, silica powder, water reducing agent, polypropylene fiber, and the like. In order to realize higher impermeability, the concrete is doped with silica powder with extremely small particles during preparation, the silica powder can be filled into gaps among cement particles, so that the concrete becomes more compact, and meanwhile, a new product blocks a permeation channel in the concrete through secondary hydration of the silica powder, so that the impermeability of the concrete is improved. However, the extremely small particle size of silica fume makes it possible to have a large specific surface area, which leads to an increase in the amount of water used for concrete, and further increases the risk of concrete drying shrinkage cracking. Especially in high temperature environment, when the evaporation speed is fast, the early shrinkage crack of the concrete is not easy to control. Therefore, it is necessary to provide a polypropylene fiber concrete which does not contain silica powder and has high impermeability.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the polypropylene fiber concrete which does not contain silica powder and has high anti-permeability performance and the preparation method thereof.
In a first aspect, an embodiment of the present invention provides a polypropylene fiber concrete, which is prepared from the following raw materials by weight: 155-165 kg/m water3330 to 360kg/m of cement3700 to 710kg/m of fine aggregate31000 to 1040kg/m of coarse aggregate350-90 kg/m of fly ash30.7 to 1.1kg/m of polypropylene fiber330-40 kg/m calcium sulphoaluminate expanding agent36-10 kg/m of water reducing agent3。
The polypropylene fiber concrete provided by the embodiment of the invention has at least the following beneficial effects:
the internal pores of the concrete are controlled by the proportion of the fine aggregate and the coarse aggregate, and the free ettringite crystal particles generated by the calcium sulphoaluminate expanding agent can further fill the internal pores, so that the compactness of the concrete is improved; meanwhile, the screen effect of the polypropylene fibers uniformly and disorderly distributed in the concrete can slow down the rapid sinking of the coarse aggregate and hinder the migration of free water, and prevent the micro cracks in the concrete from developing into communicated cracks; thereby effectively improving the impermeability of the concrete.
In addition, the shrinkage compensation effect of the calcium sulphoaluminate expanding agent can improve the crack resistance of the concrete structure. And the polypropylene fiber can bear the residual tensile stress after the expansion stress is offset, so that the crack resistance of the concrete is further improved, and the early plastic shrinkage cracking of the concrete is effectively inhibited. The added fly ash and the used polycarboxylate water reducing agent can improve the workability of concrete. When in use, the fly ash replaces cement with equal amount by an internal mixing method, so that the hydration heat of the cement can be effectively reduced, and the later strength of the concrete is improved.
According to the polypropylene fiber concrete provided by the embodiment of the invention, the diameter of the polypropylene fiber is 18-35 mu m, and the length of the polypropylene fiber is 6-20 mm. When the polypropylene fiber with the length-diameter ratio is used for external doping, the screen effect can be more obvious, so that the occurrence of communication cracks is further inhibited, and the anti-seepage effect of concrete is promoted.
According to the polypropylene fiber concrete of some embodiments of the invention, the fineness modulus of the fine aggregate is 3.0-2.3. The medium sand with the fineness modulus of 3.0-2.3 is used as fine aggregate to produce the concrete, so that the internal pores of the concrete can be effectively controlled, and the compactness and the impermeability of the concrete are improved.
According to the polypropylene fiber concrete of some embodiments of the present invention, the fineness modulus of the fine aggregate is more than 2.7.
According to some embodiments of the present invention, the polypropylene fiber concrete has a content of 0 to 5% of fine aggregate having a particle size of more than 4.75mm, a content of 10 to 15% of fine aggregate having a particle size of 2.36 to 4.75mm, a content of 10 to 15% of fine aggregate having a particle size of 1.18 to 2.36mm, a content of 20 to 30% of fine aggregate having a particle size of 600 to 1.18mm, a content of 30 to 35% of fine aggregate having a particle size of 300 to 600 μm, a content of 5 to 10% of fine aggregate having a particle size of 150 to 300 μm, and a content of 0 to 5% of fine aggregate having a particle size of less than 150 μm, based on the total weight of the fine aggregates. The fine aggregate is specially graded, so that the compactness and the crack resistance of the concrete are effectively considered.
According to some embodiments of the present invention, the polypropylene fiber concrete has a content of 2 to 3% of fine aggregate having a particle size of more than 4.75mm, a content of 12 to 13% of fine aggregate having a particle size of 2.36mm to 4.75mm, a content of 13 to 14% of fine aggregate having a particle size of 1.18mm to 2.36mm, a content of 25 to 28% of fine aggregate having a particle size of 600 μm to 1.18mm, a content of 30 to 34% of fine aggregate having a particle size of 300 μm to 600 μm, a content of 8 to 10% of fine aggregate having a particle size of 150 μm to 300 μm, and a content of fine aggregate having a particle size of less than 150 μm, based on the total weight of the fine aggregates. After the fine aggregate and the coarse aggregate which are accurately proportioned according to the proportion are matched, the internal pores of the concrete can be controlled to the maximum extent, the compactness of the concrete is improved, and the impermeability of the concrete is improved.
According to the polypropylene fiber concrete of some embodiments of the present invention, based on the total weight of the fine aggregates, the content of the fine aggregates having a particle size of more than 4.75mm is 2.9%, the content of the fine aggregates having a particle size of 2.36mm to 4.75mm is 12.4%, the content of the fine aggregates having a particle size of 1.18mm to 2.36mm is 13.6%, the content of the fine aggregates having a particle size of 600 μm to 1.18mm is 26.3%, the content of the fine aggregates having a particle size of 300 μm to 600 μm is 32.2%, the content of the fine aggregates having a particle size of 150 μm to 300 μm is 9.2%, and the content of the fine aggregates having a particle size of less than 150 μm is 3.4%.
According to the polypropylene fiber concrete of some embodiments of the present invention, river sand is used as the fine aggregate.
According to the polypropylene fiber concrete provided by the invention, the particle size of the coarse aggregate is 5-30 mm. The coarse aggregate in the particle size range is used as a framework filling material of concrete, so that the occurrence of communication cracks caused by rapid sinking of the coarse aggregate can be effectively avoided, and the impermeability is improved.
According to some embodiments of the present invention, the polypropylene fiber concrete comprises 1 to 4% of coarse aggregates having a particle size of 25 to 30mm, 20 to 30% of coarse aggregates having a particle size of 20 to 25mm, 20 to 30% of coarse aggregates having a particle size of 16 to 20mm, 20 to 30% of coarse aggregates having a particle size of 10 to 16mm, 8 to 12% of coarse aggregates having a particle size of 5 to 10mm, 3 to 6% of coarse aggregates having a particle size of 2.5 to 5mm, and 0 to 3% of coarse aggregates having a particle size of less than 2.5mm, based on the total weight of the coarse aggregates. Through the grading of coarse aggregates with different particle sizes, the aggregates are integrally in a relatively homogeneous state, the separation in the movement process is reduced to the maximum extent, and the compactness and impermeability of the concrete are effectively ensured.
According to some embodiments of the present invention, the polypropylene fiber concrete has a content of 2 to 4% of coarse aggregates having a particle size of 25 to 30mm, a content of 25 to 28% of coarse aggregates having a particle size of 20 to 25mm, a content of 26 to 30% of coarse aggregates having a particle size of 16 to 20mm, a content of 26 to 30% of coarse aggregates having a particle size of 10 to 16mm, a content of 8 to 10% of coarse aggregates having a particle size of 5 to 10mm, a content of 4 to 6% of coarse aggregates having a particle size of 2.5 to 5mm, and a content of coarse aggregates having a particle size of less than 2.5mm, based on the total weight of the coarse aggregates. After the coarse aggregate and the fine aggregate are matched according to the proportion, the internal pores of the concrete can be controlled to the maximum extent, the compactness of the concrete is improved, and the impermeability of the concrete is improved.
According to the polypropylene fiber concrete of some embodiments of the present invention, based on the total weight of the coarse aggregates, the content of the coarse aggregates having a particle size of 25 to 30mm is 2.6%, the content of the coarse aggregates having a particle size of 20 to 25mm is 26.6%, the content of the coarse aggregates having a particle size of 16 to 20mm is 27.7%, the content of the coarse aggregates having a particle size of 10 to 16mm is 27.1%, the content of the coarse aggregates having a particle size of 5 to 10mm is 9.4%, the content of the coarse aggregates having a particle size of 2.5 to 5mm is 4.7%, and the content of the coarse aggregates having a particle size of less than 2.5mm is 1.9%.
According to the polypropylene fiber concrete of some embodiments of the present invention, the coarse aggregate is crushed stone.
According to some embodiments of the polypropylene fiber concrete of the present invention, the cement is portland cement. The ordinary portland cement is a hydraulic cementing material prepared by grinding portland cement clinker, a mixed material and a proper amount of gypsum, has high strength and good wear resistance, and can improve the comprehensive performance of concrete.
According to the polypropylene fiber concrete of some embodiments of the present invention, the strength grade of the cement is 42.5.
According to the polypropylene fiber concrete of some embodiments of the invention, the specification of the fly ash is class F class II. The fineness requirement of the F class II fly ash is not more than 25 percent, the water requirement ratio is not more than 105 percent, the ignition loss is not more than 8 percent, and the water content is not more than 1 percent. The later strength of the concrete can be improved by adopting the F-class II-grade fly ash to prepare the concrete.
According to the polypropylene fiber concrete provided by the invention, the water reducing rate of the polycarboxylate superplasticizer is more than or equal to 25%.
According to the polypropylene fiber concrete of some embodiments of the present invention, the calcium sulfoaluminate expanding agent is a HCSA-II type high performance expanding agent.
In a second aspect, an embodiment of the present invention provides a method for preparing polypropylene fiber concrete, which comprises the following steps:
(1) mixing a polycarboxylic acid water reducing agent, polypropylene fibers and water;
(2) adding the coarse aggregate, the fine aggregate and the gelling component in sequence, and uniformly mixing; the gelling component comprises cement, fly ash and a calcium sulphoaluminate expanding agent.
The concrete is prepared by adopting the feeding sequence, so that the agglomeration of the polypropylene fibers can be avoided, and the polypropylene fibers are uniformly distributed, thereby ensuring the mechanics and other related performances of the concrete.
The preparation method of the polypropylene fiber concrete according to some embodiments of the invention comprises the following steps:
(1) dissolving a polycarboxylic acid water reducing agent in water, adding polypropylene fibers, and stirring for 15 s;
(2) and adding the coarse aggregate, the fine aggregate, the cement, the fly ash and the calcium sulphoaluminate expanding agent in sequence, and stirring for 120 s.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
Example 1
This example provides a polypropylene fiber concrete having the amount per cubic meter shown in table 1.
TABLE 1 blend ratio of polypropylene fiber concrete (kg/m)3)
Wherein:
the water-cement ratio of the concrete is 0.36, and the cementing material comprises cement, fly ash and calcium sulphoaluminate expanding agent.
The cement is ordinary Portland cement with the strength grade of 42.5.
The fly ash adopts class F II, and the mixing amount is 15.3 percent of the using amount of the cementing material.
The sand ratio was 41% for fine aggregate/(fine aggregate + coarse aggregate). The fine aggregate is river sand with good gradation, and the fineness modulus is 3.0-2.7. The coarse aggregate is crushed stone with good gradation, and the particle size of the aggregate is 5-30 mm.
The diameter of the polypropylene fiber is 18-35 μm, the length is 6-20mm, and the doping amount is 0.2% of the gel material amount by adopting an external doping method.
The water reducing rate of the polycarboxylic acid water reducing agent is more than or equal to 25 percent, and the mixing amount is 1.8 percent of the using amount of the cementing material by adopting an external mixing method.
The calcium sulphoaluminate expanding agent adopts HCSA-II type high-performance expanding agent, adopts an internal mixing method, and replaces cement with 7.8 percent of the using amount of cementing material in an equivalent manner.
The particle composition of the fine aggregate is shown in table 2 below, and the particle composition of the coarse aggregate is shown in table 3 below.
TABLE 2 Fine aggregate particle size distribution
| Nominal particle size | 5.00mm | 2.50mm | 1.25mm | 630μm | 315μm | 160μm | Chassis |
| Calculated by percent of screen residue% | 2.9 | 12.4 | 13.6 | 26.3 | 32.2 | 9.2 | 3.4 |
| Cumulative percent of screen residue% | 2.9 | 15.3 | 28.9 | 55.2 | 87.4 | 96.6 | 100 |
TABLE 3 coarse aggregate particle size distribution
| Nominal particle size | 31.5mm | 25.0mm | 20.0mm | 16.0mm | 10.0mm | 5.0mm | 2.5mm | Chassis |
| Calculated by percent of screen residue% | 0 | 2.6 | 26.6 | 27.7 | 27.1 | 9.4 | 4.7 | 1.9 |
| Cumulative percent of screen residue% | 0 | 2.6 | 29.2 | 56.9 | 84.0 | 93.4 | 98.1 | 100 |
The embodiment also provides a preparation method of the polypropylene fiber concrete, which comprises the following steps:
(1) dissolving a polycarboxylic acid water reducing agent in water, adding polypropylene fibers, and stirring for 15 s;
(2) adding coarse aggregate (broken stone), fine aggregate (river sand), cement, fly ash and calcium sulphoaluminate expanding agent in sequence, and stirring for 120 s. If the fibers are still agglomerated, the stirring time can be prolonged.
Examples 2 to 6
Polypropylene fiber concrete was provided, differing from example 1 only in the mixing ratio of the components, as shown in table 4 below.
TABLE 4 Polypropylene fiber concreteMixing ratio (kg/m)3)
Example 7
Comparative experiment
Two schemes shown in the following table 5 were used as comparative examples 1 and 2, and the selection of materials, the gradation pattern, and the like of each component were the same as those in example 1.
TABLE 5 blend ratio of polypropylene fiber concrete (kg/m)3)
Concrete was prepared by the preparation method of example 1 according to the mixing ratios of examples 1 to 6 and comparative examples 1 and 2, and various properties of the prepared concrete were measured, and the results are shown in table 6.
TABLE 6 concrete Performance test results
It can be seen that the 28-day compressive strength values, 21-day compressive strength values of the same-nutrient, impervious rating were higher for the embodiment of the present invention compared to comparative examples 1 and 2, and no cracks occurred in the concrete cast 7 d.
The result shows that the polypropylene fiber expansion concrete prepared by the invention can effectively inhibit early shrinkage cracking of the concrete in actual construction; the concrete has good workability, good cohesiveness and water retention, does not have segregation and bleeding, can meet the requirements of site construction, and obviously improves the compressive strength.
In conclusion, the polypropylene fiber concrete provided by the embodiment of the invention has the advantages that the polypropylene fibers and the calcium sulphoaluminate expanding agent are cooperated to resist cracking, and the crack resistance of the concrete is greatly improved. The workability of concrete is improved by adding fly ash and polycarboxylic acid high-performance water reducing agent. Meanwhile, the fly ash replaces cement with equal amount by an internal mixing method, thereby reducing the hydration heat of the cement and improving the later strength of the concrete. The components and material consumption of the polypropylene fiber concrete are in the optimum proportion determined by tests, and the working performance, the mechanical property and the impermeability of the concrete prepared according to the proportion can meet the construction requirements.
In addition, the concrete mixing proportion of the embodiment of the invention is tested when the coarse aggregate and the fine aggregate are in a drying state, and the water consumption can be adjusted according to the actual water content of the coarse aggregate and the fine aggregate in the using process; in the concrete mixing proportion in the embodiment of the invention, the mixing amount of the polycarboxylate superplasticizer can be adjusted according to the water reducing rate and the solid content of the polycarboxylate superplasticizer (the polycarboxylate high-performance superplasticizers produced by different manufacturers have different performance parameters); the river sand in the concrete mixing proportion can adopt fine sand or coarse sand, and when the fine sand is adopted, the sand rate is reduced, and the water consumption is increased; when coarse sand is used, the sand rate is increased and the water consumption is reduced.
Example 8
A polypropylene fibre concrete differing from example 1 in that the fly ash specification is class F class i. Compared with class F II class fly ash, class F class I class fly ash has smaller fineness, less water requirement and less loss on ignition. When the concrete is prepared, the concrete can replace class F and class II for the most part, the later strength and the workability of the concrete are ensured, and meanwhile, the concrete has higher mechanical property and impermeability, and meets various requirements of waterproof concrete.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. Polypropylene fiber concrete and its production processIs characterized by being prepared from the following raw materials in parts by weight: 155-165 kg/m water3330 to 360kg/m of cement3700 to 710kg/m of fine aggregate31000 to 1040kg/m of coarse aggregate350-90 kg/m of fly ash30.7 to 1.1kg/m of polypropylene fiber330-40 kg/m calcium sulphoaluminate expanding agent36-10 kg/m of water reducing agent3。
2. The polypropylene fiber concrete according to claim 1, wherein the polypropylene fibers have a diameter of 18 to 35 μm and a length of 6 to 20 mm.
3. The polypropylene fiber concrete according to claim 1, wherein the fineness modulus of the fine aggregate is 3.0 to 2.3.
4. The polypropylene fiber concrete according to claim 3, wherein the fine aggregate having a particle size of more than 4.75mm is contained in an amount of 0 to 5%, the fine aggregate having a particle size of 2.36 to 4.75mm is contained in an amount of 10 to 15%, the fine aggregate having a particle size of 1.18 to 2.36mm is contained in an amount of 10 to 15%, the fine aggregate having a particle size of 600 to 1.18mm is contained in an amount of 20 to 30%, the fine aggregate having a particle size of 300 to 600 μm is contained in an amount of 30 to 35%, the fine aggregate having a particle size of 150 to 300 μm is contained in an amount of 5 to 10%, and the fine aggregate having a particle size of less than 150 μm is contained in an amount of 0 to 5%, based on the total weight of the fine aggregates.
5. The polypropylene fiber concrete according to claim 1, wherein the coarse aggregate has a particle size of 5 to 30 mm.
6. The polypropylene fiber concrete according to claim 5, wherein the coarse aggregate having a particle size of 25 to 30mm is contained in an amount of 1 to 4%, the coarse aggregate having a particle size of 20 to 25mm is contained in an amount of 20 to 30%, the coarse aggregate having a particle size of 16 to 20mm is contained in an amount of 20 to 30%, the coarse aggregate having a particle size of 10 to 16mm is contained in an amount of 20 to 30%, the coarse aggregate having a particle size of 5 to 10mm is contained in an amount of 8 to 12%, the coarse aggregate having a particle size of 2.5 to 5mm is contained in an amount of 3 to 6%, and the coarse aggregate having a particle size of less than 2.5mm is contained in an amount of 0 to 3%, based on the total weight of the coarse aggregate.
7. Polypropylene fiber concrete according to any of claims 1 to 6, whereby the cement is ordinary portland cement.
8. The polypropylene fiber concrete according to claim 7, wherein the cement has a strength rating of 42.5.
9. Polypropylene fiber concrete according to any of claims 1 to 6, whereby the fly ash has a class F class II specification.
10. The method for preparing polypropylene fiber concrete according to any one of claims 1 to 9, comprising the steps of:
(1) mixing a polycarboxylic acid water reducing agent, polypropylene fibers and water;
(2) adding the coarse aggregate, the fine aggregate and the gelling component in sequence, and uniformly mixing; the gelling component comprises cement, fly ash and a calcium sulphoaluminate expanding agent.
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| CN202010478906.XA CN111662053A (en) | 2020-05-29 | 2020-05-29 | Polypropylene fiber concrete and preparation method thereof |
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| CN114195457A (en) * | 2021-12-23 | 2022-03-18 | 南京卓南建设科技有限公司 | Concrete and preparation method thereof |
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| CN117209225A (en) * | 2023-09-13 | 2023-12-12 | 新泰中联泰丰水泥有限公司 | Waterproof impervious cement-based material and preparation process and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114195457A (en) * | 2021-12-23 | 2022-03-18 | 南京卓南建设科技有限公司 | Concrete and preparation method thereof |
| CN114349427A (en) * | 2022-01-14 | 2022-04-15 | 西安建筑科技大学 | Polypropylene fiber reinforced concrete and preparation method thereof |
| CN116375414A (en) * | 2023-03-31 | 2023-07-04 | 深圳市龙岗大工业区混凝土有限公司 | Anti-cracking concrete and preparation method thereof |
| CN116514482A (en) * | 2023-04-06 | 2023-08-01 | 三明鑫龙建设工程有限公司 | Preparation method and construction process of concrete for hydraulic engineering diaphragm wall |
| CN117209225A (en) * | 2023-09-13 | 2023-12-12 | 新泰中联泰丰水泥有限公司 | Waterproof impervious cement-based material and preparation process and application thereof |
| CN117209225B (en) * | 2023-09-13 | 2024-03-15 | 新泰中联泰丰水泥有限公司 | Waterproof impervious cement-based material and preparation process and application thereof |
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