CN115925366A - Self-repairing concrete with overall enhanced performance and preparation method thereof - Google Patents
Self-repairing concrete with overall enhanced performance and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 107
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000004568 cement Substances 0.000 claims abstract description 41
- 239000000835 fiber Substances 0.000 claims abstract description 34
- 239000004576 sand Substances 0.000 claims abstract description 32
- 239000002101 nanobubble Substances 0.000 claims abstract description 27
- 239000002245 particle Substances 0.000 claims abstract description 27
- 239000004575 stone Substances 0.000 claims abstract description 25
- 239000000654 additive Substances 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 18
- 239000002689 soil Substances 0.000 claims abstract description 18
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 claims abstract description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 16
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 16
- 229940104869 fluorosilicate Drugs 0.000 claims abstract description 13
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 19
- 239000010881 fly ash Substances 0.000 claims description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 16
- 239000011707 mineral Substances 0.000 claims description 16
- 235000010755 mineral Nutrition 0.000 claims description 16
- -1 polypropylene Polymers 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical group [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 239000008399 tap water Substances 0.000 claims description 9
- 235000020679 tap water Nutrition 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 5
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical group OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- 235000012255 calcium oxide Nutrition 0.000 claims description 5
- 150000002148 esters Chemical class 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000004566 building material Substances 0.000 abstract 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 12
- 229910001424 calcium ion Inorganic materials 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
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- 239000008139 complexing agent Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 230000008961 swelling Effects 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
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- 230000004907 flux Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 230000000813 microbial effect Effects 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
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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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a self-repairing concrete with overall enhanced performance and a preparation method thereof, belonging to the technical field of building materials. The concrete comprises the following components in parts by weight: 210-400 parts of cement, 110-160 parts of admixture, 8-16 parts of multifunctional self-repairing agent, 8-14 parts of additive, 680-850 parts of sand, 1000-1100 parts of stone and 150-185 parts of micro-nano bubble water; the multifunctional self-repairing agent comprises organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber and fluorosilicate crosslinking agent; in the cement, cement particles with the particle size of 20-80 mu m account for 10-30 percent; the additive is a water reducing agent containing a micron bubble air entraining agent. The concrete obtained by the invention has good workability, high strength, good crack resistance and excellent durability, and simultaneously has strong self-repairing capability of inner and outer cracks.
Description
Technical Field
The invention belongs to the technical field of self-repairing concrete, and particularly relates to self-repairing concrete with overall enhanced performance and a preparation method thereof.
Background
The concrete has higher compressive strength and excellent formability, and in addition, the raw materials are easy to obtain and have proper price, so that the concrete is widely used as a structural material in all aspects of engineering construction. However, the service environment of the concrete structure is complex and variable, the concrete structure is easy to crack under the combined action of external load, internal stress, harmful ions and other factors, the initial microcrack has limited damage to the concrete, if the concrete cannot be repaired in time, the crack is continuously expanded to form a wider and deeper harmful crack, the harmful crack affects the safety of the concrete structure, and even various serious accidents are caused. On the other hand, along with the improvement of construction requirements and the improvement of environmental requirements, the quality of raw materials for mixing concrete is increasing, and under the condition, the difficulty of ensuring excellent working performance, strength and good durability of a concrete body is increasing continuously.
In order to improve the workability of concrete, under the condition that raw materials, particularly aggregates, are inconvenient to replace, the total amount of powder of the concrete is generally increased or certain air is introduced, but such methods may increase the cost of the concrete, possibly damage the durability of the concrete, and under the condition that the construction environment is complicated, the methods are not favorable for the workability of the concrete in actual casting. The traditional crack repairing method comprises coating, reinforcing and grouting, but the traditional crack repairing method belongs to repair after problems occur, and is mainly used for repairing larger cracks, so that the effect of manual repair is limited. The concrete crack self-repairing technologies which are gradually developed in recent years mainly include microbial self-repairing, hollow or microcapsule self-repairing, electrochemical self-repairing, shape memory alloy self-repairing and the like, and the technologies have advanced representativeness but are mostly concentrated in laboratory research at present, and few practical engineering application cases exist.
Disclosure of Invention
The invention aims to provide self-repairing concrete with overall enhanced performance and a preparation method thereof, which can effectively improve the workability of the concrete, improve the strength and the crack resistance of the concrete, have good durability and simultaneously have extremely strong damage repairing and crack self-repairing capabilities.
In order to achieve the purpose, the invention adopts the following technical scheme:
the self-repairing concrete with the overall enhanced performance comprises the following components in parts by weight: 210-400 parts of cement, 110-160 parts of admixture, 8-16 parts of multifunctional self-repairing agent, 8-14 parts of additive, 680-850 parts of sand, 1000-1100 parts of stone and 150-185 parts of micro-nano bubble water; wherein:
the multifunctional self-repairing agent comprises the following components: 0.15 to 0.60 percent of organic phosphonate, 3 to 5 percent of soil expanding agent, 71 to 76 percent of calcium expanding agent, 20 to 23 percent of hybrid fiber and 0.4 to 1.1 percent of fluosilicate crosslinking agent; the hybrid fiber is a mixture of calcium sulfate whiskers and chopped polypropylene fibers, and the mass ratio of the calcium sulfate whiskers to the chopped polypropylene fibers is 85-95;
in the cement, cement particles with the particle size of 20-80 mu m account for 10-30 percent;
the additive is a water reducing agent containing a micron bubble air entraining agent.
According to the scheme, in the multifunctional self-repairing agent, the organic phosphate is amino trimethylene phosphonic acid; the soil expanding agent is calcium bentonite with the fineness of 200-800 meshes; the calcium expanding agent is quicklime; the fluorosilicate crosslinking agent is magnesium fluorosilicate.
According to the scheme, in the hybrid fiber, the diameter of the calcium sulfate whisker is 1-10 mu m, and the length of the calcium sulfate whisker is 50-200 mu m; the length of the short-cut polypropylene fiber is 6-8 mm.
According to the scheme, the cement is 42.5 ordinary portland cement.
According to the scheme, the admixture is coal ash and mineral powder.
Preferably, the fly ash is class ii fly ash.
Preferably, the ore powder is S95 grade ore powder.
According to the scheme, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 25%.
According to the scheme, the micron bubble air entraining agent is polyether ester air entraining agent.
According to the scheme, in the admixture, the using amount of the micron bubble air entraining agent accounts for 1-3 per mill of the mass of the water reducing agent.
According to the scheme, the particle size of bubbles in the micro-nano bubble water is less than 20 micrometers.
According to the scheme, the sand is natural river sand, machine-made sand or a mixture of the natural river sand and the machine-made sand, the fineness modulus is 2.3-3.0, and the mud content is less than or equal to 3%.
According to the scheme, the stone is 5-25mm continuous graded broken stone, and the mud content is less than or equal to 1%.
The invention also provides a preparation method of the comprehensive performance enhanced self-repairing concrete, which comprises the following steps:
1) Weighing the raw materials according to the mixing ratio;
2) Uniformly mixing organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber and fluorosilicate crosslinking agent by a mixer to obtain the multifunctional self-repairing agent;
3) Introducing gas into tap water in an aeration mode according to certain speed, gas quantity and time to obtain micro-nano bubble water;
4) Adding cement, admixture, sand and stone into a forced stirrer, stirring for 30-45 s, and uniformly mixing;
5) Adding the multifunctional self-repairing agent obtained in the step 2) into a stirrer, and stirring for 30-45 s;
6) Adding the micro-nano bubble water and the additive obtained in the step 3) into a stirrer, and mixing for 90-120 s to obtain the comprehensive performance enhanced self-repairing concrete.
The invention provides a self-repairing concrete with overall enhanced performance, which has the following working mechanism:
on one hand, the addition of 10-30% of coarse cement particles with the particle size of 20-80 μm into the cement is beneficial to reducing the water consumption and early-stage temperature stress of the concrete, and the coarse cement particles are slowly dissolved and continuously hydrated in a longer time to be beneficial to compacting the internal structure of the concrete, and more importantly, a large amount of slowly hydrated cement particles provide a large amount of calcium ion raw materials for a complexing agent and a crosslinking agent, and provide a foundation for the rapid and large formation of a complex crystallization product.
On the other hand, the micro-bubbles introduced by the additive and the micro-nano bubbles introduced by the water enrich the total slurry amount of the concrete by physical filling under the condition of not increasing powder in the concrete construction stage, the wrapping property of the concrete is improved, in addition, the round micro-nano bubbles play a roll ball effect, the fluidity of the concrete is improved, the dispersed micro-nano bubbles cannot influence the strength of the concrete, and the frost resistance of the concrete is favorably improved. The micro-bubbles introduced by the admixture and the micro-nano bubbles introduced by the water also have good synergistic cooperation effect, wherein: the size of bubbles generated by the air entraining agent is not controllable, occasionally larger bubbles are unfavorable to the mechanical property and durability of concrete, and by cooperating with the micro-nano bubble water with controllable size, on one hand, the using amount of the air entraining agent can be reduced, and the adverse effect of too large bubbles is avoided, and more importantly, the bubbles in the water are all micro-nano bubbles with controllable size and improved concrete performance, so that the air entraining agent is favorable for comprehensively enhancing the concrete performance; however, the stability of the bubbles introduced by water is poor, the bubbles can be broken and disappear slowly along with the prolonging of time, the bubbles of the admixture are kept for a longer time until the construction is finished, and the two bubbles complement each other in the early stage and the later stage to synergistically improve the performance of the concrete.
In addition, the multifunctional self-repairing agent is formed by mixing organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber, fluorosilicate crosslinking agent and the like, plays an important role in both the construction stage and the service stage of concrete, and specifically comprises the following components:
the organic phosphonate is selected as a calcium ion complexing agent, when a small amount of water enters a crack, the organic phosphonate rapidly revives from a sleeping state and is complexed with a large amount of calcium ions dissolved in water and then migrates everywhere in the crack, when carbonate ions or unhydrated cement particles are encountered, the organic phosphonate complexing agent sends out the calcium ions to generate crystals such as calcium carbonate and C-S-H gel, the two substances are main crystal substances for repairing the crack, and the organic phosphonate complexing agent continuously complexes more calcium ions after the calcium ions are sent out to be rapid growth work of the crystal substances until the crack is completely repaired, and the organic phosphonate does not substantially participate in reaction and is not consumed, so the complex can play a crack repairing function in the whole life cycle of concrete.
Meanwhile, the fluorosilicate cross-linking agent can improve the internal structure of the concrete by hydrolyzing to generate silicic acid colloid, so that the early and later strength of the concrete is improved, F & lt- & gt can be dissociated to promote dissolution of calcium ions, so that CaF is generated to cover the surfaces of hydration products, rapid hydration of cement is delayed to a certain extent, the workability of the concrete is ensured, and the calcium ions promoting dissolution can also become reaction substances of crack repairing crystals.
In addition, two swelling agents, namely a soil swelling agent and a calcium swelling agent, are selected in the application, and the two swelling agents respectively and synergistically repair cracks from physical and chemical layers; wherein: firstly, the soil expanding agent blocks most of the crack space by huge volume expansion caused by high water absorption at the earliest stage of water seepage after the concrete cracks, thereby preventing more water from invading the interior of the concrete and providing a stable environment for the formation and growth of crystal repairing substances on one hand; on the other hand, the calcium expanding agent can be subjected to a chemical reaction with water in the soil expanding agent which can stably absorb and store water and has an expanded volume, the generated product can keep the expanded state of the soil expanding agent so as to block cracks together with the soil expanding agent, and in addition, the calcium expanding agent can also provide a large amount of calcium ions which are dissolved in the water and subjected to a chemical reaction with the complexing agent and the crosslinking agent to form a repair crystal.
Finally, the invention selects the hybrid fiber, and the calcium sulfate whisker with small particle size and the chopped fiber with large particle size are compounded according to a reasonable proportion, wherein: on one hand, the calcium sulfate whisker belongs to micron-sized fiber with the grain diameter smaller than that of cement particles, can be used as a grading improvement component to fill fine pores in concrete, and can also prevent the generation and the expansion development of micro cracks through excellent mechanical properties, so that the internal microstructure of the concrete is improved; meanwhile, calcium sulfate belongs to slightly soluble crystals, and can provide a part of reactive ions for repairing concrete cracks possibly appearing in the later period; on the other hand, the length of the chopped fibers is less than 10mm, a large amount of small reinforcing steel bars are introduced into the concrete with a low mixing amount, the small reinforcing steel bars embedded into the concrete are favorable for limiting the development of microscopic cracks, the toughness of the concrete is improved, and the chopped fibers can be used as a foundation bed for rapid formation and growth of crystalline products in the concrete crack repairing process due to high polarity.
The invention has the following beneficial effects:
1. the invention provides the self-repairing concrete with overall enhanced performance, the working performance of the concrete is effectively improved through the synergistic cooperation of the components, the strength and the crack resistance of the concrete are improved, the concrete has good durability, and meanwhile, the concrete has extremely strong damage repairing and crack self-repairing capabilities, and the application prospect is wide.
2. The multifunctional self-repairing agent is formed by mixing organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber, fluorosilicate crosslinking agent and the like, plays an important role in both the construction stage and the service stage of concrete, wherein F-is dissociated from the fluorosilicate crosslinking agent to promote the dissolution of calcium ions in the calcium expanding agent, mineral admixture and unhydrated cement particles, and the organic phosphonate complexing agent and the fluorosilicate crosslinking agent promote the generation of calcium carbonate, C-S-H gel and CaF crystals after capturing a large amount of calcium ions in water, so that the substances and the expanding agent play a role in repairing cracks together through the accumulation and blocking effect. Moreover, since the organic phosphonate does not substantially participate in the reaction and is not consumed, the complex can play a crack repairing role in the whole life cycle of the concrete.
3. According to the invention, the bubbles are introduced in a synergistic manner by introducing the micro bubbles through the additive and introducing the micro bubbles through the water, so that the use of the air entraining agent is reduced, the adverse effect of a large amount of large bubbles on the concrete is avoided, the size of the bubbles is ensured to be controllable, and meanwhile, the two bubbles are mutually supplemented in the early stage and the late stage, so that the effect of the bubbles in the whole construction process is realized, and the performance of the concrete is synergistically improved.
4. The invention adds 10-30% coarse particle cement with particle size between 20-80 μm into cement, which is beneficial to the performance of concrete and provides a large amount of calcium ion raw materials for complexing agent and cross-linking agent, and provides a foundation for the rapid and large formation of complex crystallization products.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The self-repairing concrete with overall enhanced performance comprises the following components in parts by weight: 225 parts of cement, 70 parts of mineral powder, 80 parts of fly ash, 9 parts of multifunctional self-repairing agent, 9.4 parts of additive, 830 parts of sand, 1080 parts of stone and 180 parts of micro-nano bubble water. Wherein:
the cement is 42.5 ordinary portland cement, wherein cement particles with the particle size of 20-80 mu m account for 28 percent.
The fly ash is II-grade fly ash, and the sieve residue of 45 mu m is 23%.
The mineral powder is S95 grade mineral powder, and the 28d activity index is 97%.
The multifunctional self-repairing agent comprises the following components: 0.19 percent of amino trimethylene phosphonic acid, 3.31 percent of 200-mesh calcareous bentonite, 74.69 percent of quicklime, 21.34 percent of mixed fiber and 0.47 percent of magnesium fluosilicate. The hybrid fiber is formed by compounding 4-10 mu m calcium sulfate whisker and 8mm chopped polypropylene fiber according to the mass ratio of 93.
The additive is a polycarboxylic acid high-performance water reducing agent containing a polyether ester air entraining agent, and the water reducing rate of the water reducing agent is more than or equal to 25 percent.
The dosage of the air entraining agent is 3 per mill of the mass of the water reducing agent.
The sand is machine-made sand, the fineness modulus is 3.0, and the mud content is 2.1%.
The stone is 5-25mm continuous graded broken stone, and the mud content is 0.8%.
In the micro-nano bubble water, the bubble particle size is less than 20 mu m.
A preparation method of self-repairing concrete with overall enhanced performance comprises the following steps:
1) Weighing the raw materials according to the mixing ratio;
2) Uniformly mixing organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber and fluorosilicate crosslinking agent by a mixer to obtain the multifunctional self-repairing agent;
3) Introducing gas into tap water in an aeration mode according to certain speed, gas quantity and time to obtain micro-nano bubble water;
4) Adding cement, admixture, sand and stone into a forced stirrer, stirring for 30s and uniformly mixing;
5) Adding a multifunctional self-repairing agent into a stirrer, and stirring for 30s;
6) And adding micro-nano bubble water and an additive into the stirrer, and stirring for 90s to obtain the fully-performance enhanced self-repairing concrete.
Comparative example 1
The common concrete comprises the following components in parts by weight: 225 parts of commercially available common 42.5 cement, 70 parts of mineral powder, 80 parts of fly ash, 9.4 parts of common polycarboxylic admixture, 830 parts of sand, 1080 parts of stone and 180 parts of tap water, wherein the quality of the fly ash, the mineral powder, the sand and the stone is consistent with that of the embodiment 1. Weighing the required materials according to the mass ratio, putting the materials into a forced mixer, and stirring for 90s to obtain the common concrete.
Example 2
A self-repairing concrete with overall enhanced performance comprises the following components in parts by weight: 290 parts of cement, 80 parts of mineral powder, 65 parts of fly ash, 11.6 parts of multifunctional self-repairing agent, 10.9 parts of additive, 755 parts of sand, 1035 parts of stone and 170 parts of micro-nano bubble water. Wherein:
the cement is 42.5 ordinary portland cement, wherein cement particles with the particle size of 20-80 mu m account for 20 percent,
the fly ash is grade II fly ash, and the sieve residue of 45 mu m is 20 percent.
The mineral powder is S95 grade mineral powder, and the 28d activity index is 97%.
The multifunctional self-repairing agent comprises the following components: 0.25% of amino trimethylene phosphonic acid, 3.33% of 400-mesh calcareous bentonite, 8978% of quick lime, 8978% of zxft 8978%, 20.82% of hybrid fiber and 0.63% of magnesium fluosilicate. The composite fiber is formed by compounding 4-8 mu m calcium sulfate whisker and 6mm chopped polypropylene fiber according to a mass ratio of 90.
The additive is a polycarboxylic acid high-performance water reducing agent containing a polyether ester air entraining agent, and the water reducing rate of the water reducing agent is more than or equal to 25 percent.
The dosage of the air entraining agent is 1.5 per mill of the mass of the water reducing agent.
The sand is formed by mixing machine-made sand and natural sand 1:1, the fineness modulus is 2.8, and the mud content is 1.8%.
The stone is 5-25mm continuous graded broken stone, and the mud content is 0.6%.
In the micro-nano bubble water, the particle size of bubbles in the water is less than 20 mu m.
A preparation method of a self-repairing concrete with overall enhanced performance comprises the following steps:
1) Weighing the raw materials according to the mixing ratio;
2) Uniformly mixing organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber and fluorosilicate crosslinking agent by a mixer to obtain the multifunctional self-repairing agent;
3) Introducing gas into tap water in an aeration mode according to certain speed, gas quantity and time to obtain micro-nano bubble water;
4) Adding cement, admixture, sand and stone into a forced stirrer, stirring for 30s, and uniformly mixing;
5) Adding a multifunctional self-repairing agent into a stirrer, and stirring for 30s;
6) Micro-nano bubble water and an additive are added into the stirrer, and the mixture is stirred for 105s to obtain the self-repairing concrete with overall enhanced performance.
Comparative example 2
The same procedure as in example 2 was carried out except that conventional 42.5 cement was used as cement, and the same composition and amount were used as in example 2.
Comparative example 3
The same material composition and amount as in example 2 were used, except that 1250-mesh bentonite was used as the soil swelling agent, and the same operation method as in example 2 was used.
Comparative example 4
Except that common tap water is used for removing water, the dosage of the air entraining agent is 2.5 per mill of the weight of the water reducing agent, the composition and the dosage of other materials are the same as those in the embodiment 2, and the operation method is the same as that in the embodiment 2.
Comparative example 5
The common concrete comprises the following components in parts by weight: 290 parts of commercially available ordinary 42.5 cement, 10.9 parts of ordinary polycarboxylic acid admixture, and 170 parts of tap water, and the composition and the amount of the other materials are the same as those in example 2. Weighing the required materials according to the mass ratio, putting the materials into a forced mixer, and stirring for 105s to obtain the common concrete.
Example 3
The self-repairing concrete with overall enhanced performance comprises the following components in parts by weight: 380 parts of cement, 70 parts of mineral powder, 50 parts of fly ash, 14.8 parts of multifunctional self-repairing agent, 12.5 parts of additive, 700 parts of sand, 1065 parts of stone and 155 parts of micro-nano bubble water.
The cement is 42.5 ordinary portland cement, wherein 11% of cement particles with the particle size of 20-80 μm are used.
The fly ash is grade II fly ash, and the sieve residue of 45 mu m is 18 percent.
The mineral powder is S95 grade mineral powder, and the 28d activity index is 97%.
The multifunctional self-repairing agent comprises the following components: 0.55 percent of amino trimethylene phosphonic acid, 4.56 percent of 800-mesh calcareous bentonite, 72.0 percent of quicklime, 21.98 percent of mixed fiber and 0.91 percent of magnesium fluosilicate.
The composite fiber is formed by compounding 1-4 mu m calcium sulfate whisker and 6mm chopped polypropylene fiber according to the mass ratio of 87.
The additive is a polycarboxylic acid high-performance water reducing agent containing a polyether ester air entraining agent, and the water reducing rate of the water reducing agent is more than or equal to 25 percent.
The dosage of the air entraining agent is 1 per mill of the mass of the water reducing agent.
The sand is natural sand, the fineness modulus is 2.5, and the mud content is 1.3%.
The stone is 5-25mm continuous graded broken stone, and the mud content is 0.5%.
In the micro-nano bubble water, the bubble particle size is less than 20 mu m.
A preparation method of a self-repairing concrete with overall enhanced performance comprises the following steps:
1) Weighing the raw materials according to the mixing ratio;
2) Uniformly mixing organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber and fluorosilicate crosslinking agent by a mixer to obtain the multifunctional self-repairing agent;
3) Introducing gas into tap water in an aeration mode according to certain speed, gas quantity and time to obtain micro-nano bubble water;
4) Adding cement, admixture, sand and stone into a forced stirrer, stirring for 30s and uniformly mixing;
5) Adding a multifunctional self-repairing agent into a stirrer, and stirring for 30s;
6) Adding micro-nano bubble water and an additive into the stirrer, and stirring for 120s to obtain the self-repairing concrete with overall enhanced performance.
Comparative example 6
The common concrete comprises the following components in parts by weight: 380 parts of commercially available common 42.5 cement, 70 parts of mineral powder, 50 parts of fly ash, 14.8 parts of common polycarboxylic admixture, 700 parts of sand, 1065 parts of stone and 155 parts of tap water, wherein the quality of the fly ash, the mineral powder, the sand and the stone is consistent with that of the example 3. Weighing the required materials according to the mass ratio, and then putting the materials into a forced mixer to mix for 120s to obtain the common concrete.
Working performance, strength, electric flux, plastic shrinkage cracking and load damage strength recovery tests are respectively carried out on the examples and the comparative examples according to GB/T50080-2016 (Standard for test methods of Performance of common concrete mixtures), GB/T50081-2019 (Standard for test methods of physical and mechanical Properties of concrete), GB/T50082-2019 (Standard for test methods of Long-term Performance and durability of common concrete), CCES 01-2018 (guide for designing and constructing durability of concrete Structure), and T/CECS-2021 (Standard for test methods of self-repairing Property of Cement concrete 913).
The barrier properties were restored as follows: taking a part of each of concrete in examples and concrete in comparative examples, respectively forming 10 round cake test pieces with the diameter of 100 phi 50mm, pressing a penetrating crack with the width of 0.2-0.5mm in the middle of a round cake by adopting a pressing mode after the round cake is 7d old, testing initial water seepage passing through the penetrating crack by using an anti-seepage device, carrying out water soaking maintenance, testing crack water seepage quantity after water soaking for 10d, 20d and 40d respectively, and finally evaluating the repairing degree of the concrete crack by using the ratio of the water seepage quantity after maintenance to the initial water seepage quantity, wherein the lower the ratio represents that the crack is repaired better, and when the result is 0, the crack is repaired. The water permeability of each test is the average value of all test pieces.
The results of testing the examples according to the above test methods are shown in tables 1 and 2:
table 1 results of the tests of the examples and comparative examples
TABLE 2 results of the tests of the examples and comparative examples II
The above results show that: the workability, strength, electric flux, plastic shrinkage cracking, load damage strength recovery and impermeability recovery of the comprehensively enhanced self-repairing concrete of the embodiment are comprehensively superior to those of the common concrete of the comparative example, and the concrete has the specific effects of obviously improving the workability and long-term strength of the concrete, reducing the permeability of the concrete and improving the crack resistance of the concrete; more significantly, the method can gradually repair small defects in the concrete, so that the damaged concrete basically recovers an undamaged state, particularly, fine cracks with the width of 0.2-0.5mm can be repaired within 40d under the soaking curing, and the repairing speed of the first 10d is fastest.
The above-mentioned embodiments are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions, equivalents, etc. made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The self-repairing concrete with the overall enhanced performance is characterized by comprising the following components in parts by weight: 210-400 parts of cement, 110-160 parts of admixture, 8-16 parts of multifunctional self-repairing agent, 8-14 parts of additive, 680-850 parts of sand, 1000-1100 parts of stone and 150-185 parts of micro-nano bubble water; wherein:
the multifunctional self-repairing agent comprises the following components: 0.15 to 0.60 percent of organic phosphonate, 3 to 5 percent of soil expanding agent, 71 to 76 percent of calcium expanding agent, 20 to 23 percent of hybrid fiber and 0.4 to 1.1 percent of fluosilicate crosslinking agent; the hybrid fiber is a mixture of calcium sulfate whiskers and chopped polypropylene fibers, and the mass ratio of the calcium sulfate whiskers to the chopped polypropylene fibers is 85-95;
in the cement, cement particles with the particle size of 20-80 mu m account for 10-30 percent;
the additive is a water reducing agent containing a micron bubble air entraining agent.
2. The self-repairing concrete of claim 1, wherein in the multifunctional self-repairing agent, the organic phosphate is amino trimethylene phosphonic acid; the soil expanding agent is calcareous bentonite with the fineness of 200-800 meshes; the calcium expanding agent is quicklime; the fluorosilicate crosslinking agent is magnesium fluorosilicate.
3. The self-repairing concrete of claim 1, wherein in the hybrid fiber, the calcium sulfate whiskers have a diameter of 1-10 μm and a length of 50-200 μm; the length of the short-cut polypropylene fiber is 6-8 mm.
4. The self-repairing concrete of claim 1, wherein the micro-bubble air entraining agent in the admixture is a polyether ester air entraining agent.
5. The self-repairing concrete of claim 1, wherein in the admixture, the amount of the micron air bubble air entraining agent accounts for 1-3 per mill of the mass of the water reducing agent.
6. The self-repairing concrete of claim 1, wherein the micro-nano bubble water has bubble particle size of less than 20 μm.
7. The self-repairing concrete of claim 1, characterized in that the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is not less than 25%.
8. The self-repairing concrete of claim 1, wherein the cement is 42.5 portland cement; the admixture is fly ash and mineral powder.
9. The self-repairing concrete of claim 1, wherein the sand is natural river sand, machine-made sand or a mixture of the natural river sand and the machine-made sand, the fineness modulus is 2.3-3.0, and the mud content is less than or equal to 3%; the stone is 5-25mm continuous graded broken stone, and the mud content is less than or equal to 1%.
10. The preparation method of the fully performance-enhanced self-repairing concrete as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
1) Weighing the raw materials according to the mixing ratio;
2) Uniformly mixing organic phosphonate, soil expanding agent, calcium expanding agent, hybrid fiber and fluorosilicate crosslinking agent by a mixer to obtain the multifunctional self-repairing agent;
3) Introducing gas into tap water in an aeration mode to obtain micro-nano bubble water;
4) Adding cement, admixture, sand and stone into a forced stirrer, stirring for 30-45 s, and uniformly mixing;
5) Adding the multifunctional self-repairing agent obtained in the step 2) into a stirrer, and stirring for 30-45 s;
6) Adding the micro-nano bubble water and the additive obtained in the step 3) into a stirrer, and mixing for 90-120 s to obtain the self-repairing concrete with overall enhanced performance.
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