CN111153644A - High-performance concrete for repairing underwater concrete cracks, preparation method thereof and method for repairing cracks by using high-performance concrete - Google Patents
High-performance concrete for repairing underwater concrete cracks, preparation method thereof and method for repairing cracks by using high-performance concrete Download PDFInfo
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- CN111153644A CN111153644A CN201911377031.8A CN201911377031A CN111153644A CN 111153644 A CN111153644 A CN 111153644A CN 201911377031 A CN201911377031 A CN 201911377031A CN 111153644 A CN111153644 A CN 111153644A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building 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
Abstract
A high-performance concrete for repairing underwater concrete cracks, a preparation method thereof and a method for repairing cracks by using the high-performance concrete. The invention belongs to the field of civil engineering. The method solves the technical problems that the existing method for repairing the underwater concrete cracks is difficult to meet the long-term and frequent change of the cracks and the repair measures are required to be carried out under the condition of water cut, so that the construction is difficult. The product is prepared by stirring cement, fly ash, sand, pebbles, water and an underwater non-dispersant. When in use, the concrete is slowly thrown into underwater concrete cracks. The high-performance concrete for repairing the underwater concrete crack directly repairs the crack surface of the underwater lining plate by adopting the idea of underwater direct repair, does not need to cut off water, has the repair efficiency of 95 percent, reduces the construction cost and does not pollute the water quality environment. The underwater strength of 7d is 17.6MPa, the underwater strength of 28d is 25.1MPa, the strength is high, and the compactness, the impermeability, the underwater durability and the anti-dispersion performance are excellent.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to high-performance concrete for repairing underwater concrete cracks, a preparation method of the high-performance concrete and a method for repairing cracks by using the high-performance concrete.
Background
As a large population economy country in the world, China uses water in the first place in the world, but the average water consumption per person is far lower than the average level in the world, so that China is also listed as a main poor water country in the world, and the water consumption is greatly influenced on the development of the economic society of China. In the aspect of spatial distribution, most of water resources in China are concentrated in the south, the current situation that the south is more than the north and the south is less is formed, and meanwhile, in the downstream part area of the yellow river in the northern area, due to the climate, the yellow river is frequently cut off, the water quality is also continuously deteriorated, and the water used in the northern area is undoubtedly frosted on the snow. The extreme imbalance of water resources becomes an important factor for restricting the economic development of northern areas and even nationwide, and the importance of the south-to-north water transfer project is highlighted.
The south-to-north water transfer project is an extremely large cross-drainage basin water transfer project which has the attention, and strategic adjustment of water resources in China is realized. The concrete lining plate plays a key role in the south-to-north water transfer seepage-proofing project, but in the service process, the concrete lining plate is cracked at different degrees, which brings serious threats to the safety of the project structure and the water environment in a channel, thereby solving the problem of cracking of the concrete lining plate and ensuring that the concrete lining plate can continue to normally run at first.
At present, the concrete lining cracking repair measures mainly focus on filling different materials according to the crack forms and plastering for crack repair, for example, cement-based crystalline waterproof paint, cement-based flexible waterproof paint, mortar filling method repair, polyurethane adhesive repair and the like are respectively coated on the surfaces of cracks according to the difference of the crack widths. The method is feasible for treating short cracks because most of the cracks of the channel are wide and in a motion state, but the long-term and frequent change of the cracks is difficult to meet, and the proposed lining plate repairing measures need to be repaired under the condition of water cut, so that great difficulty is brought to construction, and the normal use of the north-south water transfer project is hindered. There is therefore a need to find a method of repairing concrete cracks that can be performed underwater.
Disclosure of Invention
The invention solves the technical problems that the existing underwater concrete crack repairing method is difficult to meet the long-term and frequent change of cracks and the repairing measures need to be carried out under the condition of water cut, so that the construction is difficult, and provides the high-performance concrete for repairing the underwater concrete cracks, the preparation method thereof and the method for repairing the cracks by using the high-performance concrete.
The high-performance concrete for repairing underwater concrete cracks is prepared from 33-37 parts of cement, 4-8 parts of fly ash, 74-78 parts of sand, 95-98 parts of stones, water and an underwater non-dispersant in parts by weight; wherein the mass ratio of the water to the cement is (45-55): 100, respectively; the mass ratio of the underwater non-dispersant to the cement is (2-4): 100.
further limiting, the high-performance concrete for repairing the underwater concrete crack is prepared from 35 parts by mass of cement, 6 parts by mass of fly ash, 76 parts by mass of sand, 96.5 parts by mass of pebbles, water and an underwater non-dispersant; wherein the mass ratio of the water to the cement is 50: 100, respectively; the mass ratio of the underwater non-dispersant to the cement is 3: 100.
further limiting, the fineness modulus of the sand is 2-3.
Further defined, the sand has a fineness modulus of 2.6.
Further limited, the particle size of the stones is in the range of 5mm to 20 mm.
The method for preparing the high-performance concrete for repairing the underwater concrete cracks comprises the following steps:
firstly, adding the pebbles, the sand, the cement and the fly ash into a stirrer in sequence, and uniformly stirring, wherein the stirring parameters are as follows: rotating at the speed of 20-30 rpm, the temperature of 17-23 ℃, the relative humidity of 50-70% and the time of 2-4 min to obtain a dry mixed material;
secondly, uniformly mixing water and the underwater non-dispersant to obtain mixed liquid;
and thirdly, ① adding part of the mixed liquid obtained in the second step into the mixed dry material obtained in the first step, stirring for 2-4 min under the condition that the rotating speed is 20-30 rpm, and ② adding the rest of the mixed liquid obtained in the second step, and stirring for 5-7 min under the condition that the rotating speed is 20-30 rpm to obtain the high-performance concrete for repairing underwater concrete cracks.
Further defined, the temperature in step one is 20 ℃.
Further defined, the relative humidity in step one is 60%.
Further defined, the time in step one is 3 min.
Further, the mass of the mixed liquid obtained in the step three ① in the partial step two is 50% of the mass of the mixed liquid obtained in the step two.
Further limiting, in the third step ①, the mixture is stirred for 3min at a rotation speed of 20rpm to 30 rpm.
Further limiting, in the third step ②, stirring is carried out for 6min at a rotation speed of 20rpm to 30 rpm.
The method for repairing the underwater concrete cracks by using the high-performance concrete for repairing the underwater concrete cracks comprises the following steps:
the mixed high-performance concrete wet material for repairing the underwater concrete cracks is continuously put into the concrete cracks in water at the speed of 1 kg/min-3 kg/min until the concrete cracks are filled.
(1) The high-performance concrete for repairing the underwater concrete crack disclosed by the invention has the advantages that cement in a mixture is not dispersed by water flow when the high-performance concrete for repairing the underwater concrete crack is poured underwater, an internal aggregate is not separated, the high-performance concrete can be well molded, has proper fluidity, good construction performance, good self-compaction and self-leveling properties, can well finish the repair function of the underwater crack, and has special anti-dispersion performance.
(2) The high-performance concrete for repairing the underwater concrete cracks adopts the idea of underwater direct repair to directly repair the crack surfaces of the underwater lining plates, water is not required to be cut off, the repair efficiency can reach 95 percent, the construction cost is reduced, and the normal use and water quality environment of the south-to-north water transfer project are ensured.
(3) According to the high-performance concrete for repairing underwater concrete cracks, the fly ash is added to be used as a part of a concrete cementing material to replace part of cement, so that the fluidity and the later strength of the concrete can be improved, the temperature cracks are reduced, and the compactness, the impermeability and the underwater durability of the concrete forming are improved.
(4) The high-performance concrete for repairing underwater concrete cracks has the characteristic of no water source pollution. The concrete is continuously thrown into water, and meets the requirements of 4 to 5 types of water according to the national standard GB3830-2002 'surface water environmental quality standard'. After standing for one day, 500mL of the supernatant solution was collected and examined. The ammonia nitrogen content in water is lower than 0.37mg/L, the total nitrogen content is lower than 0.81mg/L, the total phosphorus content is lower than 0.01L, the chemical oxygen demand is lower than 45mg/L, and the iron content is lower than 0.15mg/L, so that the concrete has the characteristic of no water source pollution, and can be used for repairing underwater concrete cracks in south-water and north-water adjustment engineering and the like.
Detailed Description
The first embodiment is as follows: the high-performance concrete for repairing the underwater concrete crack in the embodiment is prepared from 348.5kg of cement, 61.5kg of fly ash, 758kg of sand, 965kg of stones, 174.2kg of water and 10.2kg of underwater non-dispersant by mass.
The cement is swan P.O 42.5.5 ordinary portland cement. All indexes of the cement meet the quality requirements of GB175-1999 Portland cement and ordinary Portland cement.
The embodiment adopts the fly ash to replace part of cement, improves the fluidity, the later strength and the compactness of the concrete, and reduces the generation of temperature cracks. The chemical content of the fly ash is shown in table 1.
TABLE 1 main chemical content of fly ash
In the embodiment, the stone is used as the aggregate, and the aggregate is used as the supporting material of the concrete, so that the concrete can be filled, and the manufacturing cost is reduced. In order to enable underwater concrete to have good self-compaction and facilitate construction, the particle size of the stones is 5-20 mm, and the stones are graded continuously.
In the embodiment, the sand with the fineness modulus of 2.59 is used as the fine aggregate in the concrete, so that the water consumption of the undispersed concrete is reduced, and the fluidity of the concrete is improved.
The underwater non-dispersing agent is a UWB-II type underwater non-dispersing agent developed and produced by China Petroleum group engineering research institute, and can enable the common concrete to have the advantages of water scouring resistance, self-leveling property and self-compaction property under water.
The water is tap water.
The method for preparing the high-performance concrete for repairing the underwater concrete cracks comprises the following steps:
firstly, adding the pebbles, the sand, the cement and the fly ash into a stirrer in sequence, and uniformly stirring, wherein the stirring parameters are as follows: the rotating speed is 20 rpm-30 rpm, the temperature is 20 ℃, the relative humidity is 60%, and the time is 3min, so as to obtain a mixed dry material;
secondly, uniformly mixing water and the underwater non-dispersant to obtain mixed liquid;
and thirdly, ① adding part of the mixed liquid obtained in the second step into the mixed dry material obtained in the first step, stirring for 3min under the condition that the rotating speed is 20-30 rpm, and ② adding the rest of the mixed liquid obtained in the second step, and stirring for 6min under the condition that the rotating speed is 20-30 rpm to obtain the high-performance concrete for repairing underwater concrete cracks.
Further, the mass of the mixed liquid obtained in the step three ① in the partial step two is 50% of the mass of the mixed liquid obtained in the step two.
Pollution performance detection: and (2) dividing 500g of unhardened high-performance concrete wet material for repairing underwater concrete cracks into 10 parts, each 50g of unhardened high-performance concrete wet material, sequentially adding 10 parts of concrete wet material into 1L of water prepared from south to north in an uninterrupted manner, standing for one day, and taking 500mL of supernatant solution for detection. The ammonia nitrogen content in water is lower than 0.37mg/L, the total nitrogen content is lower than 0.81mg/L, the total phosphorus content is lower than 0.01L, the chemical oxygen demand is lower than 45mg/L, the iron content is lower than 0.15mg/L, and the requirements of 4 to 5 types of water are met according to the national standard GB3830-2002 'surface water environmental quality standard'. The high-performance concrete for repairing the underwater concrete cracks of the embodiment has the characteristic of no water source pollution, and can be used for repairing the underwater concrete cracks in south-to-north water transfer engineering and the like.
The method for repairing the underwater concrete cracks by using the high-performance concrete for repairing the underwater concrete cracks comprises the following steps:
and continuously throwing the stirred high-performance concrete wet material for repairing the underwater concrete cracks into the underwater concrete cracks at the speed of 1kg/min until the concrete cracks are filled.
Verification test
The following simulation test is adopted to verify the actual repair effect of the high-performance concrete for repairing the underwater concrete cracks in the south-to-north water diversion process in the first embodiment, and the specific steps are as follows:
firstly, selecting a 150mm multiplied by 150mm, placing the mold into a water tank with the height of 450mm, and throwing the stirred high-performance concrete for repairing the underwater concrete cracks into the underwater mold in multiple times until the throwing amount exceeds the surface of the mold, wherein the throwing amount is 1/10 of the volume of the mold every time in an uninterrupted throwing mode, and the throwing speed is 1 kg/min;
and secondly, taking out the mould, standing for 5-10 min, observing the self-leveling and self-compacting of the concrete surface layer, tapping the two sides of the mould to discharge water, leveling the excessive concrete material on the surface of the mould, and removing the mould after the concrete is formed for two days to obtain the test piece.
(II) detecting the anti-dispersion performance: the cement loss and the pH value are measured, the cement loss is less than or equal to 1.5 percent, and the pH value is less than or equal to 12, so that the requirement of anti-dispersion performance is met.
(III) intensity detection: and (3) curing the obtained test piece in water, taking out the test piece from the water to detect the strength when the test piece is cured to be 7d or 28d, and obtaining the 7d underwater strength of 17.6MPa and the 28d underwater strength of 25.1 MPa.
Claims (10)
1. The high-performance concrete for repairing the underwater concrete crack is characterized by being prepared from 33-37 parts by mass of cement, 4-8 parts by mass of fly ash, 74-78 parts by mass of sand, 95-98 parts by mass of stones, water and an underwater non-dispersant; wherein the mass ratio of the water to the cement is (45-55): 100, respectively; the mass ratio of the underwater non-dispersant to the cement is (2-4): 100.
2. the high-performance concrete for repairing the underwater concrete crack is characterized by being prepared from 35 parts by mass of cement, 6 parts by mass of fly ash, 76 parts by mass of sand, 96.5 parts by mass of stones, water and an underwater non-dispersant; wherein the mass ratio of the water to the cement is 50: 100, respectively; the mass ratio of the underwater non-dispersant to the cement is 3: 100.
3. the high-performance concrete for repairing underwater concrete cracks of claim 1, wherein the fineness modulus of the sand is 2-3.
4. The high performance concrete for repairing underwater concrete cracks of claim 1, wherein the sand has a fineness modulus of 2.6.
5. The high performance concrete for repairing underwater concrete cracks of claim 1, wherein the pebble size ranges from 5mm to 20 mm.
6. The preparation method of the high-performance concrete for repairing the underwater concrete cracks as claimed in any one of claims 1 to 5, which comprises the following specific steps:
firstly, adding the pebbles, the sand, the cement and the fly ash into a stirrer in sequence, and uniformly stirring, wherein the stirring parameters are as follows: the rotating speed is 20 rpm-30 rpm, the temperature is 17-23 ℃, the relative humidity is 50% -70%, and the time is 2 min-4 min, so as to obtain a dry mixed material;
secondly, uniformly mixing water and the underwater non-dispersant to obtain mixed liquid;
and thirdly, ① adding part of the mixed liquid obtained in the second step into the mixed dry material obtained in the first step, stirring for 2-4 min under the condition that the rotating speed is 20-30 rpm, and ② adding the rest of the mixed liquid obtained in the second step, and stirring for 5-7 min under the condition that the rotating speed is 20-30 rpm to obtain the high-performance concrete for repairing underwater concrete cracks.
7. The method for preparing high-performance concrete for repairing underwater concrete cracks according to claim 6, wherein the temperature in the first step is 20 ℃, the relative humidity is 60%, and the time is 3 min.
8. The method for preparing high-performance concrete for repairing underwater concrete cracks of claim 6, wherein the mass of the mixed liquid obtained in the second step in the third step ① is 50% of the mass of the mixed liquid obtained in the second step.
9. The method for preparing high-performance concrete for repairing underwater concrete cracks of claim 6, wherein the stirring is performed at a rotating speed of 20-30 rpm for 3min in the step three ①, and the stirring is performed at a rotating speed of 20-30 rpm for 6min in the step three ②.
10. The method for repairing cracks with the high-performance concrete for repairing underwater concrete cracks as claimed in any one of claims 1 to 5, is characterized in that the repairing method is carried out according to the following steps:
the mixed high-performance concrete wet material for repairing the underwater concrete cracks is continuously put into the concrete cracks in water at the speed of 1 kg/min-3 kg/min until the concrete cracks are filled.
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Citations (5)
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|---|---|---|---|---|
| CN1098077A (en) * | 1992-06-30 | 1995-02-01 | 交通部公路科学研究所 | A kind of underwater concrete |
| CN101289291A (en) * | 2007-04-17 | 2008-10-22 | 中国石油集团工程技术研究院 | Quick coacervation flocculant for anti-washout concrete under water |
| CN103102125A (en) * | 2013-01-25 | 2013-05-15 | 同济大学 | Manufactured sand underwater dispersion resistant concrete and preparation method thereof |
| CN106082849A (en) * | 2016-06-13 | 2016-11-09 | 中交第航务工程局有限公司 | Do not disperse high performance concrete under water |
| CN108203268A (en) * | 2016-12-20 | 2018-06-26 | 大连理工大学 | A kind of underwater concrete and preparation method thereof |
-
2019
- 2019-12-27 CN CN201911377031.8A patent/CN111153644A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098077A (en) * | 1992-06-30 | 1995-02-01 | 交通部公路科学研究所 | A kind of underwater concrete |
| CN101289291A (en) * | 2007-04-17 | 2008-10-22 | 中国石油集团工程技术研究院 | Quick coacervation flocculant for anti-washout concrete under water |
| CN103102125A (en) * | 2013-01-25 | 2013-05-15 | 同济大学 | Manufactured sand underwater dispersion resistant concrete and preparation method thereof |
| CN106082849A (en) * | 2016-06-13 | 2016-11-09 | 中交第航务工程局有限公司 | Do not disperse high performance concrete under water |
| CN108203268A (en) * | 2016-12-20 | 2018-06-26 | 大连理工大学 | A kind of underwater concrete and preparation method thereof |
Non-Patent Citations (4)
| Title |
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| 无: "UWB系列 水下不分散混凝土", 《石油工程建设》 * |
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