AU2021100389A4 - An underwater self-compacting concrete for repairing canal lining panels - Google Patents
An underwater self-compacting concrete for repairing canal lining panels Download PDFInfo
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- AU2021100389A4 AU2021100389A4 AU2021100389A AU2021100389A AU2021100389A4 AU 2021100389 A4 AU2021100389 A4 AU 2021100389A4 AU 2021100389 A AU2021100389 A AU 2021100389A AU 2021100389 A AU2021100389 A AU 2021100389A AU 2021100389 A4 AU2021100389 A4 AU 2021100389A4
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- 239000011376 self-consolidating concrete Substances 0.000 title claims abstract description 60
- 239000000203 mixture Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000004567 concrete Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 6
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 4
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 239000008030 superplasticizer Substances 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims 1
- 239000006185 dispersion Substances 0.000 abstract description 10
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 6
- 238000009415 formwork Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 241000264877 Hippospongia communis Species 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- 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
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/008—Flocking or deflocking agents
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/304—Air-entrainers
-
- 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
- C04B2111/74—Underwater applications
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
- Geology (AREA)
- Paleontology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an underwater self-compacting concrete for repairing canal lining
panels. The concrete is comprised of following components in parts by weight: 100 parts of
cementing material, 40-46 parts of water, 150-182 parts of sand, 209-255 parts of stone, 0.7-1
part of water reducing agent, 0.003-0.005 part of air-entraining agent and 0.2-0.3 part of
airentraining agent. The cementing material is comprised of the following components in parts
by weight: 50-70 parts of cement, 20-40 parts of fly ash and 10-20 parts of silica fume. This
invention discloses an underwater self-compacting concrete used for repairing canal lining
panels. Specifically, the anti-dispersion property of the concrete mixture is enhanced with the
addition of the polyacrylamide to itself. The addition of the appropriate amount of silica fume
and coarse aggregate with a particle size of 5-10mm assists the viscosity enhancement of the
concrete mixture. As a result, as the amount of flocculant used is reduced, the product is safer
and more environmentally compatible. The addition of the appropriate amount of silica
improves the early strength of the concrete. This underwater self-compacting concrete could
be used for underwater casting by directly pouring from the water surface. Other advantages
of the underwater self-compacting concrete include easily assessment of the raw materials and
simple preparation processes.
Description
An underwater self-compacting concrete for repairing canal lining pan
[01] The present invention relates to the field of concrete, in particular to an underwater self-compacting concrete for repairing canal lining panels and its preparation method.
[02] The canals are the most representative hydraulic structure in the South-to North Water Transfer Project. Concrete panels are often used to prevent seepage in the canals. However, due to unreasonable design or construction, concrete defects such as cracks, holes, and honeycombs will appear in the lining panels of the canals. Small cracks and holes can be repaired by brushing epoxy resin coating or chemical grouting. However, once deep and long cracks are formed, or the lining panel is lifted and collapsed due to frost heave, the concrete panel at the defect must be re-poured., Unlike the dry construction environment when excavating the canal, the repair of the canal lining panels needs concrete pouring underwater. The water depth of the canals is generally 30-50cm, which means, ordinary concrete cannot be poured directly. Therefore, for repairing canal lining panels, the selection of repair materials and construction methods is difficult .
[03] Traditional underwater self-compacting concrete is prepared by adding flocculant to the self-compacting concrete mixture. Flocculant allows the concrete to have a certain anti-dispersion, which means, the flocculant is theoretical possible for underwater pouring. However, evidence observed from experiments showed that increasing the dosage of flocculant will lead to a sharp decrease in the fluidity of concrete. As a result, the concrete will lose its self-compacting property and be unable to fill every corner of the lining panel. If the liquidity of the concrete is prioritized, the anti-dispersion property of concrete given by flocculant will be failed in supporting underwater pouring directly. Generally speaking, during the pouring process, it is not only necessary to insert the pumping pipeline into the water to contact the bottom of the formwork, but it is also necessary to empty the water in the pipeline to ensure that the concrete cannot pass through the water layer before being pumped to the bottom of the formwork. Even after such tedious work, the strength of concrete after hardening cannot be guaranteed.
[04] The purpose of the present invention is: to solve problems of poor anti dispersion of traditional underwater self-compacting concrete and tedious underwater pouring work. The invention provides an underwater self-compacting concrete for repairing canal lining panels. This concrete, has good fluidity and good anti-dispersion, can meet C25 strength standard which is suitable for pouring directly from water surface to underwater.
[05]
[06] The technical solution of the invention can be achieved by the following measures:
[07] An underwater self-compacting concrete for repairing canal lining panels consist of the following components in parts by weight: 100 parts of cementitious material, 40-46 parts of water, 148-182 parts of sand, 207-254 parts of stone, 0.7-1 part of water reducing agent, 0.003-0.005 part of air-entraining agent and 0.2-0.3 part of flocculant.
[08] The cementing material consists of the following components in parts by weight: 50-70 parts of cement, 20-40 parts of fly ash, and 10-20 parts of silica fume.
[09] The cement is 42.5 medium heat portland cement with an apparent density of 3.12g/cm3 .
[010] The fly ash is Class I fly ash with an apparent density of 2.41g/cm3 .
[011] The silica fume has SiO2 content > 92% and an apparent density of 1.68g/cm3 .
[012] The water is tap water.
[013] The sand is medium sand, with an apparent density of 2.67g/cm3 , fineness modulus of 2.8, and fine powder content (particle size < 0.125mm) of 13%.
[014] The stones are small stones, which are first-class mixed, with an apparent density of 2.66g/cm 3, a particle size of 5-10 mm and, needle-like content of 3.6%.
[015] The water reducing agent is a liquid polycarboxylic superplasticizer with water-reducing rate of 25%.
[016] The air-entraining agent is a liquid high-efficiency air-entraining agent.
[017] The flocculant is a solid polyacrylamide powder with a molecular weight of 8 million.
[018] The preparation method of the underwater self-compacting concrete for repairing canal lining panels consists of the following steps:
[019] 1) The cementing material, sand, stone, and flocculant are weighed according to the mixture ratio and poured into a blender for mixing, then the mixture is stirred for the 30s.
[020] 2) The water reducing agent, air-entraining agent, and water are weighed according to the mixture ratio and poured into a bucket for mixing. The mixture is stirred with a stirring rod for 30 seconds After this, the mixture is transferred into a blender and stirred for 120s to obtain the concrete.
[021] The invention has the following advantages:
[022] 1. The invention selects a polyacrylamide with a molecular weight of 8 million as the flocculant. This selection result in less dosage, and a strong flocculation effect, as well as a reduction in the engineering cost and a reduction on environmental impact.
[023] 2. The viscosity of the concrete mixture is adjusted by adding silica fume. Compared with the traditional underwater self-compacting concrete, the addition of the silica fume leads to a stronger anti-dispersion property and a more suitable underwater construction.
[024] 3. By adding silica fume, the content of fly ash is reduced, which improved early strength of concrete.
[025] 4. The coarse aggregate with a particle size of 5-10 mm is selected to assist in the enhancement of the viscosity of the concrete mixture, which results in the reduction in the dosage of flocculant. As a result, the construction is safer and more environmentally friendly.
[026] 5. The invention allows pouring directly from water surface to underwater, which leads to more flexible and simpler operation and a reduction in the construction difficulty.
[027] 6. The invention has the advantage of easy raw material getting and the simple preparation method.
[028] Fig. 1 is a picture comparison of slump flow test between traditional underwater self-compacting concrete mixture and the underwater self-compacting concrete mixture of the present invention.
[029] Fig. 2 is a picture comparison between the conventional underwater self compacting concrete and the underwater self-compacting concrete of the present invention after underwater pouring and curing for 7 days.
[030] Fig. 3 is a picture of the appearance of the underwater self-compacting concrete mixture of the present invention discharged from the warehouse.
[031] The implementation of the present invention will be described in detail regarding the figures and embodiments. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only and are not intended to be limiting. Other embodiments developed by general technicians without creative work departing from the scope of the present invention should belong to the scope of protection of the present invention. If conditions are not specifically indicated in the embodiments, they shall be carried out according to the conventional conditions or the conditions suggested by the manufacturer. If the reagents or instruments used are without the indication of the manufacturer, they should be conventional products that can be obtained through commercial purchase.
[032]
[033] Embodiment 1
[034] An underwater self-compacting concrete for repairing canal lining panels consists of the following components in parts by weight: 100 parts of cementitious material, 46 parts of water, 182 parts of sand, 255 parts of stone, 1 part of water reducing agent, 0.003 part of air-entraining agent and 0.25 part of flocculant.
[035] The cementing material comprises the following components in parts by weight: 50 parts of cement, 35 parts of fly ash, and 15 parts of silica fume.
[036] The preparation method of the underwater self-compacting concrete for repairing canal lining panels consists of the following steps:
[037] 1) The cementing material, sand, stone, and flocculant are weighed according to the mixture ratio. Then materials are poured into a blender for mixing and stirred for 30s.
[038] 2) The water reducing agent, air-entraining agent, and water were weighed according to the mixture ratio and were poured into a bucket for mixing. The mixture was stirred with a stirring rod for 30s, then the mixture was poured into a blender, and stirred for 120s to obtain the concrete.
[039]
[040] Embodiment 2
[041] An underwater self-compacting concrete for repairing canal lining panels consists of the following components in parts by weight: 100 parts of cementitious material, 46 parts of water, 180 parts of sand, 251 parts of stone, 1 part of water reducing agent, 0.003 part of air-entraining agent and 0.25 part of flocculant.
[042] The cementing material consists of the following components in parts by weight: 60 parts of cement, 30 parts of fly ash, and 10 parts of silica fume.
[043] The preparation method of the underwater self-compacting concrete for repairing canal lining panels consists of the following steps:
[044] 1) The cementing material, sand, stone, and flocculant are weighed according to the mixture ratio and poured into a blender for mixing, then the mixture is stirred for 30s.
[045] 2) The water reducing agent, air-entraining agent, and water are weighed according to the mixture ratio, and poured into a bucket for mixing,the mixture is stirred with a stirring rod for 30s andpoured into a blender for furthurstirring for 120s to obtain the concrete.
[046]
[047] Embodiment 3
[048] An underwater self-compacting concrete for repairing canal lining panels consists of the following components in parts by weight: 100 parts of cementitious material, 40 parts of water, 151 parts of sand, 210 parts of stone, 1 part of water reducing agent, 0.003 part of air-entraining agent and 0.2 part of flocculant.
[049] The cementing material consists of the following components in parts by weight: 60 parts of cement, 30 parts of fly ash, and 10 parts of silica fume.
[050] The preparation method of the underwater self-compacting concrete for repairing canal lining panels consists of the following steps:
[051] 1) The cementing material, sand, stone, and flocculant are weighed according to the mixture ratio and poured into a blender for mixing. The mixture is stirred for 30s.
[052] 2) The water reducing agent, air-entraining agent, and water are weighed according to the mixture ratio, and poured into a bucket for mixing, and stirred with a stirring rod for 30s, then the mixture is transferred into a blender for further stirring for 120s to obtain the concrete.
[053]
[054] Embodiment 4
[055] An underwater self-compacting concrete for repairing canal lining panels consists of the following components in parts by weight: 100 parts of cementitious material, 40 parts of water, 150 parts of sand, 209 parts of stone, 1 part of water reducing agent, 0.003 part of air-entraining agent and 0.2 part of flocculant.
[056] The cementing material consists of the following components in parts by weight: 50 parts of cement, 35 parts of fly ash, and 10 parts of silica fume.
[057] The preparation method of the underwater self-compacting concrete for repairing canal lining panels consists of the following steps:
[058] 1) The cementing material, sand, stone, and flocculant are weighed according to the mixture ratio and poured into a blender for mixing. The mixture is stirred for 30s.
[059] 2) The water reducing agent, air-entraining agent, and water are weighed according to the mixture ratio, and poured into a bucket for mixing. The mixture is stirred with a stirring rod for 30s, then was poured into a blender,for further stirring for 120s to obtain the concrete.
[060] In addition to the above four embodiments, according to the invention, the fluidity, anti-dispersion, and mechanical properties of each embodiment are tested in combination with the traditional underwater self-compacting concrete control group.
[061] Table 1 Concrete mix ratio
Groups Raw materials in parts by weight
Water Cement Fly Silica Sand Stone Water Air Flocculant ash fume reducing entraining agent agent Embodiment 46 50 35 15 178 249 1 0.003 0.25 1 Embodiment 46 60 30 10 179 250 1 0.003 0.25 2 Embodiment 40 50 35 15 149 209 1 0.003 0.25 3 Embodiment 40 60 30 10 152 212 1 0.003 0.25 4 Control 46 60 40 0 182 255 1 0.003 0.25 group
[062] The test methods and evaluation indexes for testing various performances of the invention are as follows:
[063] 1) Slump flow test: slump flow > 550mm.
[064] 2) Test of cement loss by weighing method: cement loss less than 1.5%.
[065] 3) Test of suspended matter content: suspended matter content less than 150 mg/L.
[066] 4) Test of compressive strength of hardened concrete: compressive strength > 25MPa in 28 days after underwater pouring, water-land strength ratio in 7 days > 0.6, water-land strength ratio in 28 days > 0.7.
[067] The underwater pouring mentioned in the invention is directly poured from the water surface, and the height from the bottom of the formwork to the water surface is 40cm.
[068] The fluidity and anti-dispersion test results of Embodiments 1-4 and the control group of the present invention are shown in Table 2, as well as the mechanical properties test results are shown in Table 3.
[069] Table 2 Test results of fluidity and anti-dispersion
Groups Slump flow (mm) Cement loss (%) Suspended matter content (mg/L) Embodiment 1 600 1.4 147 Embodiment 2 600 1.2 115 Embodiment 3 600 0.7 87 Embodiment 4 575 1.1 96 Control group 575 18.2 676
[070] Table 3 Test results of mechanical properties
Groups 7-day compressive strength 28 days compressive strength
Underwa On land Water-land Underwater On land Water-land ter ratio ratio
Embodiment 1 14.6 22.4 0.65 27.5 38.7 0.71 Embodiment 2 15.2 23.1 0.66 30.4 40.5 0.75 Embodiment 3 18.6 27.3 0.68 34.2 43.8 0.78 Embodiment 4 21.7 31.0 0.70 37.0 45.1 0.82 Control group 5.2 22.8 0.23 11.0 39.2 0.28
[071] It can be seen from the above results that Embodiments 1-4 of the present invention all meet the C25 strength requirements, and comparing with the control group, the problem that the traditional underwater self-compacting concrete cannot have both good fluidity and anti-dispersion property is effectively solved.
[072] Fig. 1 is a picture comparison between the conventional underwater self compacting concrete mixture and the underwater self-compacting concrete mixture of the present invention. Among them, the left side of Figure 1 shows the traditional underwater self-compacting concrete mixture, and the right side shows the underwater self-compacting concrete mixture of the present invention. It can be seen from the figure that although the traditional underwater self-compacting concrete mixture has good fluidity, its integrity is not strong, and there are bleeding and segregation phenomena; while the underwater self-compacting concrete mixture of the present invention has strong fluidity, strong integrity, no segregation, and no bleeding, it has a certain viscosity, and its color is deeper than that of the traditional underwater self-compacting concrete mixture due to the incorporation of silica fume.
[073] Fig. 2 is a picture comparison between the conventional underwater self compacting concrete and the underwater self-compacting concrete of the present invention after underwater pouring and curing for 7 days. Among them, the left side of Figure 2 shows the traditional underwater self-compacting concrete, and the right side shows the underwater self-compacting concrete of the present invention. It can be seen from the figure that the traditional underwater self-compacting concrete has a huge loss of cement and a large number of gaps on the molding surface, which seriously affects the strength after hardening and cannot be used for underwater pouring; while the underwater self-compacting concrete of the present invention has a small loss of cement, a flat molding surface and a high hardening strength, and is suitable for underwater pouring.
[074] Fig. 3 shows the appearance of the underwater self-compacting concrete mixture of the present invention discharged from the warehouse. Other parts that are not explained in detail are prior art.
[075] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms, in keeping with the broad principles and the spirit of the invention described herein.
[076] The present invention and the described embodiments specifically include the best method known to the applicant of performing the invention. The present invention and the described preferred embodiments specifically include at least one feature that is industrially applicable
Claims (12)
1. An underwater self-compacting concrete for repairing canal lining panels consists of the following components in parts by weight: 100 parts of cementitious material, 40-46 parts of water, 148-182 parts of sand, 207-254 parts of stone, 0.7-1 part of water reducing agent, 0.003-0.005 part of air-entraining agent and 0.2-0.3 part of flocculant.
2. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 is characterized in that the cementing material consists of the following components in parts by weight: 50-70 parts of cement, 20-40 parts of fly ash, and 10-20 parts of silica fume.
3. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 is characterized in that the cement is 42.5 medium heat portland cement with an apparent density of 3.12g/cm3 .
4. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 is characterized in that the fly ash is Class I fly ash with an apparent density of 2.41g/cm3 .
5. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 ischaracterized in that the silica fume SiO2 content is > 92% and the apparent density is 1.68g/cm3 .
6. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 ischaracterized in that the water used is tap water.
7. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 is characterized in that the sand is medium sand, with an apparent density of 2.67g/cm 3, fineness modulus of 2.8, and fine powder content (particle size < 0.125mm) of 13%.
8. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 ischaracterized in that the stones used are small stones, which are first-class mixed, with an apparent density of 2.66g/cm 3, a particle size of 5-10mm, and a needle-like content of 3.6%.
9. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 ischaracterized in that the water reducing agent is a liquid polycarboxylate superplasticizer with a water-reducing rate of 25%.
10. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 ischaracterized in that the air-entraining agent is a liquid high efficiency air-entraining agent.
11. The underwater self-compacting concrete for repairing canal lining panels according to claim 1 ischaracterized in that the flocculant is solid polyacrylamide powder with a molecular weight of 8 million.
12. The preparation method of the underwater self-compacting concrete for repairing canal lining panels according to claim 1 ischaracterized by comprising the following steps:
1) The cementing material, sand, stone, and flocculant are weighed according to the mixture ratio and poured into a blender for mixing. The mixture is stirred for 30s.
2) The water reducing agent, air-entraining agent, and water are weighed according to the mixture ratio, and poured into a bucket for mixing, and stirred with a stirring rod for 30s, then the mixture is poured into a blender for further stirring for 120s to obtain the concrete.
1/ 21 Jan 2021 2021100389
Fig. 1 A picture comparison of slump flow test between the traditional underwater
self-compacting concrete mixture and the underwater self-compacting concrete
mixture of the present invention.
Fig. 2 A picture comparison between the conventional underwater self-compacting
concrete and the underwater self-compacting concrete of the present invention after
underwater pouring and curing for 7 days.
2/ 21 Jan 2021 2021100389
Fig. 3 A picture of the appearance of the underwater self-compacting concrete mixture
of the present invention discharged from the warehouse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100389A AU2021100389A4 (en) | 2021-01-21 | 2021-01-21 | An underwater self-compacting concrete for repairing canal lining panels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100389A AU2021100389A4 (en) | 2021-01-21 | 2021-01-21 | An underwater self-compacting concrete for repairing canal lining panels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021100389A4 true AU2021100389A4 (en) | 2021-04-22 |
Family
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| AU2021100389A Ceased AU2021100389A4 (en) | 2021-01-21 | 2021-01-21 | An underwater self-compacting concrete for repairing canal lining panels |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939554A (en) * | 2021-04-29 | 2021-06-11 | 天元建设集团有限公司 | Novel self-compacting concrete |
| CN113845342A (en) * | 2021-10-13 | 2021-12-28 | 太原市尖草坪区荣盛新型建材有限公司 | Concrete water permeable brick and preparation method thereof |
| CN114315209A (en) * | 2022-02-15 | 2022-04-12 | 北京盛大风华科技有限公司 | Preparation method of fluorocarbon-containing viscosity-reducing polycarboxylate superplasticizer |
| CN114380548A (en) * | 2021-12-23 | 2022-04-22 | 上海建工建材科技集团股份有限公司 | Underwater anti-dispersion concrete and preparation method thereof |
| CN114478941A (en) * | 2022-01-26 | 2022-05-13 | 北京盛大风华科技有限公司 | Gas-stabilizing gradient release type polycarboxylate superplasticizer and preparation method thereof |
| CN114685119A (en) * | 2022-04-02 | 2022-07-01 | 西京学院 | Concrete with industrial solid waste silica fume replacing cement slurry and preparation method thereof |
| CN114890738A (en) * | 2022-05-09 | 2022-08-12 | 阳江海上风电实验室 | Special underwater light grouting material for filling suction cylinder of offshore wind turbine and preparation method thereof |
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2021
- 2021-01-21 AU AU2021100389A patent/AU2021100389A4/en not_active Ceased
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939554A (en) * | 2021-04-29 | 2021-06-11 | 天元建设集团有限公司 | Novel self-compacting concrete |
| CN113845342A (en) * | 2021-10-13 | 2021-12-28 | 太原市尖草坪区荣盛新型建材有限公司 | Concrete water permeable brick and preparation method thereof |
| CN114380548A (en) * | 2021-12-23 | 2022-04-22 | 上海建工建材科技集团股份有限公司 | Underwater anti-dispersion concrete and preparation method thereof |
| CN114380548B (en) * | 2021-12-23 | 2024-01-23 | 上海建工建材科技集团股份有限公司 | Underwater anti-dispersion concrete and preparation method thereof |
| CN114478941A (en) * | 2022-01-26 | 2022-05-13 | 北京盛大风华科技有限公司 | Gas-stabilizing gradient release type polycarboxylate superplasticizer and preparation method thereof |
| CN114478941B (en) * | 2022-01-26 | 2023-11-03 | 北京盛大风华科技有限公司 | Stable-gas gradient release type polycarboxylate superplasticizer and preparation method thereof |
| CN114315209A (en) * | 2022-02-15 | 2022-04-12 | 北京盛大风华科技有限公司 | Preparation method of fluorocarbon-containing viscosity-reducing polycarboxylate superplasticizer |
| CN114315209B (en) * | 2022-02-15 | 2023-01-06 | 北京盛大风华科技有限公司 | Preparation method of fluorocarbon-containing viscosity-reducing polycarboxylate superplasticizer |
| CN114685119A (en) * | 2022-04-02 | 2022-07-01 | 西京学院 | Concrete with industrial solid waste silica fume replacing cement slurry and preparation method thereof |
| CN114890738A (en) * | 2022-05-09 | 2022-08-12 | 阳江海上风电实验室 | Special underwater light grouting material for filling suction cylinder of offshore wind turbine and preparation method thereof |
| CN114890738B (en) * | 2022-05-09 | 2023-07-28 | 阳江海上风电实验室 | Special underwater light grouting material for filling suction cylinder of offshore wind turbine and preparation method thereof |
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