CN112592127B - Slow-release grouting material for steel shell immersed tube grouting and construction method thereof - Google Patents
Slow-release grouting material for steel shell immersed tube grouting and construction method thereof Download PDFInfo
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- CN112592127B CN112592127B CN202011488624.4A CN202011488624A CN112592127B CN 112592127 B CN112592127 B CN 112592127B CN 202011488624 A CN202011488624 A CN 202011488624A CN 112592127 B CN112592127 B CN 112592127B
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- 239000000463 material Substances 0.000 title claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 64
- 239000002002 slurry Substances 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000004033 plastic Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 8
- 239000011398 Portland cement Substances 0.000 claims abstract description 6
- 239000006004 Quartz sand Substances 0.000 claims abstract description 6
- 239000011325 microbead Substances 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 9
- 239000004567 concrete Substances 0.000 claims description 7
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 6
- 239000002518 antifoaming agent Substances 0.000 claims description 6
- 239000000176 sodium gluconate Substances 0.000 claims description 6
- 235000012207 sodium gluconate Nutrition 0.000 claims description 6
- 229940005574 sodium gluconate Drugs 0.000 claims description 6
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- 229940044172 calcium formate Drugs 0.000 claims description 5
- 235000019255 calcium formate Nutrition 0.000 claims description 5
- 239000004281 calcium formate Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 4
- 235000010338 boric acid Nutrition 0.000 claims description 4
- 239000004327 boric acid Substances 0.000 claims description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 229910052925 anhydrite Inorganic materials 0.000 claims description 3
- 229910021538 borax Inorganic materials 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 235000012255 calcium oxide Nutrition 0.000 claims description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 3
- 239000004328 sodium tetraborate Substances 0.000 claims description 3
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical group C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 150000001722 carbon compounds Chemical class 0.000 claims description 2
- 150000004676 glycans Chemical class 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 235000010755 mineral Nutrition 0.000 claims description 2
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 229920001282 polysaccharide Polymers 0.000 claims description 2
- 239000005017 polysaccharide Substances 0.000 claims description 2
- -1 polysiloxane Polymers 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 239000013530 defoamer Substances 0.000 abstract description 5
- 239000011376 self-consolidating concrete Substances 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 14
- 238000002156 mixing Methods 0.000 description 11
- 239000002994 raw material Substances 0.000 description 10
- 238000006703 hydration reaction Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/073—Tunnels or shuttering therefor assembled from sections individually sunk onto, or laid on, the water-bed, e.g. in a preformed trench
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a slow-release grouting material for steel shell immersed tube grouting and a construction method thereof, the slow-release grouting material for steel shell immersed tube grouting consists of quick-hardening portland cement, microbeads, slag ultrafine powder, quartz sand, composite functional components and water, wherein the composite functional components consist of an expanding agent, a slow-release water reducing agent, an early strength agent, a quick-acting defoamer, a rheological agent, a plastic expanding agent and a slump retaining agent, all the components (except water) are fully premixed into uniform dry powder in a professional factory, the dry powder of the grouting material is stirred with the water in a container according to a specified proportion by using a handheld stirrer, the stirring time is not less than 3min, the uniform slurry is obtained by stirring, and after standing for not less than 5min, the grouting can be pumped. The slow-release grouting material for grouting the steel shell immersed tube has the characteristics of good fluidity, long fluidity retention time (more than or equal to 5 hours), accurate control of vertical expansion rate, early strength, high strength and the like, and can be densely filled in a gap between self-compacting concrete and the steel shell in the steel shell immersed tube.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a slow-release grouting material filled in a gap between concrete and the wall of a steel immersed tube in a steel-shell immersed tube and a construction method thereof.
Background
In an underwater tunnel, a steel immersed tube tunnel is a common tunnel form, and the structural form of the steel immersed tube tunnel is that self-compacting concrete is poured and filled between double-layer steel shells. The self-compacting concrete poured by the structure is not smooth in air exhaust and not full in pouring in the steel shell, and is shrunk in a condensation hardening process, so that a gap exists between the concrete and the steel shell. In order to ensure that the loading capacity of the steel shell immersed tube is not affected and prevent harmful media from being accumulated in the gaps and corroding concrete and the steel shell, grouting is needed to fill the gaps. Because of the particularity of the grouting object, the grouting material has high requirements on the performance of the grouting material and the construction method thereof: 1) the grouting slurry has excellent fluidity, the fluidity is not obviously lost after the slurry is subjected to overlong time, and the fluidity retention time is not less than 5h so as to meet the requirement of filling; 2) the vertical expansion rate of the grouting slurry needs to be accurately controlled: the expansion rate is not too large, and if the expansion rate is too large, the extrusion steel shell deforms; the expansion rate cannot be too small, and the filling cannot be compacted if the expansion rate is too small; meanwhile, the expansion is basically finished within 3 hours after the slurry is stirred, the specific requirements are that the vertical expansion rate of 3 hours is 0.10-0.40%, the difference between the expansion rates of 24 hours and 3 hours is 0.00-0.30%, the slurry keeps volume stability after being hardened, and the expansion rate of 28d is 0.02-0.10%; 3) the strength of the grouting material must not be lower than the design requirement at the same time, and the 1d compressive strength is more than or equal to 25 MPa; the 3d compressive strength is more than or equal to 50 MPa; the 28d compressive strength is more than or equal to 70 MP; 4) and (4) after the grouting material is required to be poured for 2-3 hours, the grouting material can still be replenished, and the replenished grouting material can extrude the previously poured grouting material to continuously migrate and permeate to fill the unfilled gaps.
It can be seen that the grouting material for the steel shell immersed tube tunnel has extremely strict requirements on material performance, not only has high fluidity requirement, but also requires small loss of fluidity over time (overlength), i.e. long slump loss time of the slurry, and does not influence the early (1d) strength development. In order to obtain the ultra-long slump retaining effect, retarders such as sodium gluconate and the like are often adopted as the fluid cement-based material, but the ultra-long slump retaining cannot be realized by a single retarder and the setting time and the early (1d) strength are influenced. The requirements of the existing national standard 'technical specification for application of cement-based grouting materials' (GB/T50448-: for a slurry system with an ultra-long setting time, when the vertical expansion rate of 3h is met only by adopting a plastic expanding agent, the difference between the expansion rates of 24h and 3h is often out of standard, and the slurry is often too large in dry shrinkage after being hardened to achieve the construction purpose. In the searched scientific and technological papers and patents, no grouting material capable of meeting the index requirements is found. Therefore, the grouting material which can accurately control the vertical expansion rate, has good fluidity, has no obvious loss of fluidity after 5 hours and has no influence on the early strength is developed, and a matched construction method is developed, so that the grouting construction method is very necessary for the steel shell immersed tube tunnel.
Disclosure of Invention
The invention provides a slow-release grouting material and a construction method thereof by means of raw material selection, additive compounding, scientific component matching and the like aiming at the specific requirements of grouting construction of a steel-shell immersed tube tunnel, and the specific technical scheme is as follows:
the slow-release grouting material for steel shell immersed tube grouting comprises the following components in parts by weight: 100 parts of fast-hardening portland cement, 6-10 parts of microbeads, 8-15 parts of superfine slag powder, 150 parts of quartz sand, 4-8 parts of composite functional components and 30-34 parts of water, wherein the composite functional components comprise an expanding agent, a slow-release water reducing agent, an early strength agent, a quick-acting defoamer, a rheological agent, a plastic expanding agent and a slump retaining agent according to the ratio of 100: (30-40): (10-20): (10-15): (4-8): (1-3): (3-6) in weight ratio.
Preferably, the rapid hardening portland cement is P · O52.5R cement, P · I52.5 cement or P · II 52.5 cement.
Preferably, the micro-beads have an activity index of 28d not less than 105%, an average particle size of not more than 2 mu m and a specific surface area of not less than 3.0m 2 The volcanic ash mineral superfine powder micro-aggregate is provided.
Preferably, the superfine slag powder is granulated blast furnace slag with an activity index of 28d not less than 105%, an average particle size not more than 10 mu m and a specific surface area not less than 1.2 square meters per gram.
Preferably, the expanding agent is one or the combination of two of anhydrite, magnesia and quicklime with the grain diameter less than or equal to 80 mu m.
Preferably, the quartz sand is 70-140 meshes in size fraction range, the content of silicon dioxide is more than or equal to 90%, and the content of mud is less than or equal to 0.5%.
Preferably, the slow-release water reducing agent is a powdery ether polycarboxylic acid water reducing agent with low air entrainment rate, and the water reducing rate is more than or equal to 30 percent; the early strength agent is one or the combination of calcium formate and sodium sulfate; the quick-acting defoamer is a special defoamer for polysiloxane dry-mixed mortar; the rheological agent is a suspension stabilizer which is soluble in water and is formed by modifying polysaccharide macromolecular carbon compound and polyhydroxy silicate; the plastic expanding agent is N, N-dinitrosopentamethylene tetramine; the slump retaining agent is a combination of sodium gluconate, boric acid and borax.
The slow-release grouting material for grouting of the steel shell immersed tube has the truncated cone fluidity of the newly-mixed grouting material as follows: the initial fluidity of the truncated cone circular die is more than or equal to 340mm, and the fluidity of the truncated cone circular die is more than or equal to 320mm after 5 h; the 3h vertical expansion rate is 0.10-0.40%, and the difference between the 24h expansion rate and the 3h expansion rate is 0.00-0.30%; the performance indexes of the grouting material after hardening are as follows: 1d, the compressive strength is more than or equal to 25 MPa; the 3d compressive strength is more than or equal to 50 MPa; the 28d compressive strength is more than or equal to 70 MPa; the positive tensile bonding strength with concrete is more than or equal to 1.8 MPa. The 28d expansion rate is 0.02-0.10%.
The construction method of the slow-release grouting material for steel shell immersed tube grouting comprises the following steps: the components (except water) of the grouting material are fully premixed into uniform dry powder in a professional factory, the grouting material dry powder is mixed and stirred with water according to a specified proportion on a construction site, and the stirring process comprises the following steps: the rotating speed is more than or equal to 800 r/min; stirring for more than or equal to 3min to obtain uniform slurry, standing for 3-5min until the surface of the slurry does not fall and bubbles do not emerge, injecting the slurry into a steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if the grouting is not full or leaks, performing supplementary grouting within 2-3 h.
Compared with the prior art, the invention has the advantages that:
(1) the slow-release water reducing agent is an ether polycarboxylic acid water reducing agent with low air entrainment rate and high water reduction rate, and the water reducing agent continuously plays a role in steric hindrance between cement particles of slurry during high water reduction. In the prior art, a single retarder is adopted, so that the slump retaining effect cannot be ensured when the mixing amount is low, and the setting time of the slurry is too long when the mixing amount is high, so that the early strength is influenced, and the 1d strength is low or even has no strength.
(2) In the slow-release grouting material for steel shell immersed tube grouting, the compound use of the slow-release water reducer and the slump retaining agent obviously slows down the initial hydration speed of the grout, but does not completely inhibit the hydration reaction; with the slow proceeding of the hydration reaction, after about 6-8 hours, certain ion concentration is accumulated in the slurry, and the early strength agent (calcium formate or sodium sulfate) starts to act to accelerate the hydration hardening process of the system. The slump retaining agent and the early strength agent respectively play roles of 'dormancy' and 'awakening' in hydration reaction. And the cementing material adopts quick-hardening high-grade cement, so that the 1d strength of the grouting material reaches more than 25 MPa.
(3) In the slow-release grouting material for grouting the steel shell immersed tube, two volume-stable components of a plastic expanding agent and an expanding agent at the later hardening stage are also compounded. The qualified vertical expansion rate of 3h is ensured by controlling the mixing amount of the plastic expanding agent, and the expanding agent realizes expansion or compensation contraction after 3h at the later hardening stage. In the prior art, only a plastic expanding agent is used, the mixing amount is not easy to control, so that the expansion rate does not reach the standard, the slurry shrinks after 3 hours (when the mixing amount is low), or the vertical expansion rate of the slurry exceeds the standard after 3 hours (when the mixing amount is high). (4) In the slow-release grouting material for steel shell immersed tube grouting, the adopted quick-acting defoaming agent has a certain inhibiting effect on bubbles in the grouting material mixing process, and has an excellent defoaming effect after mixing is finished, so that most of bubbles can quickly escape from the grouting material within 3-5min, and the physical shrinkage of the grouting material after filling is reduced.
(5) The grouting material disclosed by the invention adopts pressure grouting and maintains the pressure for a certain time, so that the grouting material can be strongly permeated and migrated in the steel shell, meanwhile, the slump loss of the grouting material is strong, the loss of fluidity is small over time, no obvious loss of fluidity is generated within 5h, secondary filling is facilitated, and the secondary filling ensures that the grout is densely filled.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The slow-release grouting material for steel shell immersed tube grouting comprises the following raw materials in parts by weight:
wherein the composite functional components comprise an expanding agent, a slow-release water reducing agent, an early strength agent, a quick-acting antifoaming agent, a rheological agent, a plastic expanding agent and a slump retaining agent according to the weight ratio of 100: 35: 12: 10: 5: 2: 6, wherein the slump retaining agent is prepared from sodium gluconate and boric acid according to the weight ratio of 1: 2, the early strength agent adopts sodium sulfate, and the expanding agent adopts calcium oxide expanding agent.
The construction method of the slow-release grouting material for steel shell immersed tube grouting comprises the following steps: the components (except water) of the grouting material are fully premixed into uniform dry powder in a professional factory, the grouting material dry powder is mixed and stirred with water according to a specified proportion on a construction site, and the stirring process comprises the following steps: the rotating speed is more than or equal to 800 r/min; stirring for more than or equal to 3min to obtain uniform slurry, standing for 3-5min until the surface of the slurry does not fall and bubbles do not emerge, injecting the slurry into a steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if the grouting is not full or leaks, performing supplementary grouting within 2-3 h.
Example 2
The slow-release grouting material for steel shell immersed tube grouting comprises the following raw materials in parts by weight:
wherein the composite functional components comprise an expanding agent, a slow-release water reducing agent, an early strength agent, a quick-acting antifoaming agent, a rheological agent, a plastic expanding agent and a slump retaining agent according to the weight ratio of 100: 40: 20: 15: 5: 2.5: 5, the slump retaining agent is composed of sodium gluconate and boric acid according to the weight ratio of 1:4, the early strength agent adopts calcium formate, and the expanding agent adopts magnesium oxide expanding agent.
The construction method of the slow-release grouting material for steel shell immersed tube grouting comprises the following steps: the components (except water) of the grouting material are fully premixed into uniform dry powder in a professional factory, the grouting material dry powder is mixed and stirred with water according to a specified proportion on a construction site, and the stirring process comprises the following steps: the rotating speed is more than or equal to 800 r/min; stirring for more than or equal to 3min to obtain uniform slurry, standing for 3-5min until the surface of the slurry does not fall and bubbles do not emerge, injecting the slurry into a steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if the grouting is not full or leaks, performing supplementary grouting within 2-3 h.
Example 3
The slow-release grouting material for steel shell immersed tube grouting comprises the following raw materials in parts by weight:
the composite functional components comprise an expanding agent, a slow-release water reducing agent, an early strength agent, a quick-acting defoamer, a rheological agent, a plastic expanding agent and a slump retaining agent according to the ratio of 100: 32: 15: 12: 4: 3: 5, the slump retaining agent consists of sodium gluconate and borax in a weight ratio of 2:3, the early strength agent adopts calcium formate, and the expanding agent adopts anhydrite.
The construction method of the slow-release grouting material for steel shell immersed tube grouting comprises the following steps: the components (except water) of the grouting material are fully premixed into uniform dry powder in a professional factory, the grouting material dry powder is mixed and stirred with water according to a specified proportion on a construction site, and the stirring process comprises the following steps: the rotating speed is more than or equal to 800 r/min; stirring for more than or equal to 3min to obtain uniform slurry, standing for 3-5min until the surface of the slurry does not fall and bubbles do not emerge, injecting the slurry into a steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if the grouting is not full or leaks, performing supplementary grouting within 2-3 h.
Comparative example 1
The comparative grouting material comprises the following raw materials in parts by weight:
the construction method of the grouting material comprises the following steps: mixing the raw materials according to a proportion, stirring for more than 3min to obtain uniform slurry, standing for 3-5min until the surface of the slurry does not descend and bubbles do not emerge, injecting the slurry into a steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if grouting is not full or slurry leakage is found, performing filling within 2-3 h.
Comparative example 2
The comparative grouting material comprises the following raw materials in parts by weight:
the construction method of the grouting material comprises the following steps: mixing the raw materials according to a proportion, stirring for more than 3min to obtain uniform slurry, standing for 3-5min until the surface of the slurry does not descend and bubbles do not emerge, injecting the slurry into a steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if grouting is not full or slurry leakage is found, performing filling within 2-3 h.
Comparative example 3
The comparative grouting material comprises the following raw materials in parts by weight:
the construction method of the grouting material comprises the following steps: mixing the raw materials according to a proportion, stirring for more than 3min to obtain uniform slurry, standing for 3-5min until the surface of the slurry does not descend and bubbles do not emerge, injecting the slurry into a steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if grouting is not full or slurry leakage is found, performing filling within 2-3 h.
The performance index test data of the examples and the comparative examples are shown in table 1, wherein the initial fluidity, the fluidity of 5h, the vertical expansion rate of 3h, the difference between the expansion rates of 24h and 3h and the compressive strength of the grouting material are detected according to the method specified in the cement-based grouting material application technical specification (GB/T50448) of the current national standard, the expansion rate of 28d is detected according to the method specified in the self-stress cement physical inspection method (JC/T543) of the current industrial standard, and the positive tensile bonding strength of 28d and the concrete is detected according to the method specified in the engineering structure reinforcing material safety identification technical specification (GB 50728) of the current national standard.
TABLE 1 summary of Performance index test data for examples and comparative examples
| Test items | Engineering requirements | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Initial fluidity (mm) | ≥340 | 363 | 353 | 352 | 357 | 347 | 345 |
| Fluidity for 5h (mm) | ≥320 | 344 | 336 | 328 | 346 | 185 | 322 |
| 3h vertical expansion (%) | 0.10～0.40 | 0.29 | 0.28 | 0.32 | 0.37 | 0.22 | -0.20 |
| Difference between expansion rates of 24h and 3h (%) | 0～0.30 | 0.05 | 0.06 | 0.12 | 0.52 | 0.04 | -0.15 |
| 28d swell ratio (%) | 0.02～0.1 | 0.023 | 0.040 | 0.035 | -0.13 | -0.15 | 0.05 |
| 1d compressive Strength (MPa) | ≥25 | 35.7 | 38.2 | 37.6 | 5.9 | 33.7 | 10.2 |
| 3d compressive Strength (MPa) | ≥50 | 61.4 | 63.5 | 60.6 | 40.4 | 52.6 | 47.6 |
| 28d compressive Strength (MPa) | ≥70 | 79.4 | 81.5 | 86.8 | 67.8 | 69.5 | 71.2 |
| 28d and concrete positive tensile bonding strength (MPa) | ≥1.8 | 2.0 | 2.3 | 2.2 | 1.9 | 2.1 | 1.6 |
According to the performance index test data of each example in the table 1, the performance requirements of each example meet the engineering characteristic requirements, and the comparative example 1 lacks an expanding agent for compensating the cement-based later-stage drying shrinkage, so that the 28d expansion rate of the grouting material does not reach the standard, and simultaneously lacks an early strength component, so that the 1d compressive strength is lower; the comparative example 2 lacks of an expanding agent for compensating later-stage drying shrinkage of a cement base, so that the 5d fluidity of the grouting material is extremely low, and the 28d expansion rate of the grouting material does not reach the standard; the comparative example 3 lacks a plastic expanding agent, so that the difference between the 3h vertical expansion rate and the 24h and 3h expansion rates of the grouting material does not reach the standard, and simultaneously lacks an early strength component, so that the 1d compressive strength is lower.
Claims (7)
1. The slow-release grouting material for grouting the steel shell immersed tube is characterized by comprising quick-hardening portland cement, micro-beads, superfine slag powder, quartz sand, composite functional components and water in parts by weight:
100 parts of fast-hardening portland cement, 6-10 parts of microbeads, 8-15 parts of superfine slag powder, 150 parts of quartz sand, 4-8 parts of composite functional components and 30-34 parts of water;
wherein, the composite functional components comprise an expanding agent, a slow-release water reducing agent, an early strength agent, a quick-acting antifoaming agent, a rheological agent, a plastic expanding agent and a slump retaining agent according to the weight ratio of 100: 30-40: 10-20: 10-15: 4-8: 1-3: 3-6 by weight;
the slow-release water reducing agent is a powdery ether polycarboxylic acid water reducing agent with low air entrainment rate, and the water reducing rate is more than or equal to 30 percent;
the slump retaining agent is a combination of sodium gluconate, boric acid and borax;
the performance indexes of the fresh slurry of the slow-release grouting material for steel shell immersed tube grouting are as follows: the initial fluidity of the truncated cone circular die is more than or equal to 340mm, and the fluidity of the truncated cone circular die is more than or equal to 320mm after 5 h; the 3h vertical expansion rate is 0.10-0.40%, the difference between the 24h expansion rate and the 3h expansion rate is 0.00-0.30%, and the 28d expansion rate is 0.02-0.10%;
the hardened performance indexes of the slow-release grouting material for steel shell immersed tube grouting are as follows: the 1d compressive strength is more than or equal to 25MPa, the 3d compressive strength is more than or equal to 50MPa, the 28d compressive strength is more than or equal to 70MPa, and the positive tensile bonding strength with concrete is more than or equal to 1.8 MPa.
2. The slow-release grouting material for grouting of the steel-shell immersed tube according to claim 1, which is characterized in that: the quick-hardening portland cement is P.O 52.5R cement, P.I 52.5 cement or P.II 52.5 cement.
3. The slow-release grouting material for grouting of the steel-shell immersed tube according to claim 1, which is characterized in that: the micro-beads are volcanic ash mineral ultrafine powder micro-aggregates with an activity index of 28d not less than 105%, an average particle size of not more than 2 mu m and a specific surface area of not less than 3.0 square meters per gram.
4. The slow-release grouting material for grouting of the steel-shell immersed tube according to claim 1, which is characterized in that: the ultrafine slag powder is granulated blast furnace slag with the activity index of 28d not less than 105%, the average particle size not more than 10 mu m and the specific surface area not less than 1.2 square meters per gram.
5. The slow-release grouting material for grouting of the steel-shell immersed tube according to claim 1, which is characterized in that: the quartz sand is 70-140 meshes in size fraction range, the silicon dioxide content is more than or equal to 90 percent, and the mud content is less than or equal to 0.5 percent.
6. The slow-release grouting material for grouting of the steel-shell immersed tube according to claim 1, which is characterized in that: the expanding agent is one or the combination of two of anhydrite, magnesia and quicklime with the grain diameter less than or equal to 80 mu m; the early strength agent is one or the combination of calcium formate and sodium sulfate; the quick-acting defoaming agent is a special defoaming agent for polysiloxane dry powder mortar; the rheological agent is a suspension stabilizer which is soluble in water and is formed by modifying polysaccharide macromolecular carbon compound and polyhydroxy silicate; the plastic expanding agent is N, N-dinitrosopentamethylene tetramine.
7. A construction method of the slow-release grouting material for steel shell immersed tube grouting according to any one of claims 1 to 6 is characterized in that: the components except water of the grouting material are fully premixed into uniform dry powder in a professional factory, the grouting material dry powder is mixed and stirred with water according to a specified proportion at a construction site, and the stirring process comprises the following steps: the rotating speed is more than or equal to 800 r/min; stirring for more than or equal to 3min to obtain uniform slurry, standing the slurry for 3-5min until the surface of the slurry does not fall and no bubbles exist, injecting the slurry into an air drum of the steel shell immersed tube by using a screw grouting pump, wherein the grouting pressure is 0.6-0.8 MPa, the pressure maintaining time is not less than 180s, and after the pressure maintaining is finished, checking the grouting effect, and if the grouting is not full or leaks, performing filling within 2-3 h.
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| CN117466603B (en) * | 2023-11-09 | 2024-03-19 | 中国建筑第五工程局有限公司 | Cement-based grouting material special for grouting reinforcement and application thereof |
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Denomination of invention: A slow-release grouting material for steel shell immersed pipe grouting and its construction method Effective date of registration: 20231018 Granted publication date: 20220916 Pledgee: Bank of China Co.,Ltd. Changzhou New North Branch Pledgor: JIANGSU NUOBORN BUILDING MATERIALS Co.,Ltd. Registration number: Y2023980061556 |