CN113735525B - Underwater non-dispersible grouting material for pile foundation repair and preparation method thereof - Google Patents
Underwater non-dispersible grouting material for pile foundation repair and preparation method thereof Download PDFInfo
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- CN113735525B CN113735525B CN202111124519.7A CN202111124519A CN113735525B CN 113735525 B CN113735525 B CN 113735525B CN 202111124519 A CN202111124519 A CN 202111124519A CN 113735525 B CN113735525 B CN 113735525B
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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
-
- 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
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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
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/74—Underwater applications
-
- 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
The invention relates to the field of building materials, in particular to an underwater non-dispersible grouting material for pile foundation repair and a preparation method thereof, wherein the grouting material comprises the following components: the grouting material disclosed by the invention has higher fluidity and excellent mechanical property, the slump loss is less within 60min, the initial setting time is more than or equal to 6h, and the final setting time is more than or equal to 7h, so that the grouting material can meet the requirements of underwater pile foundation repair, and can be particularly used for deep-hole pile foundation grouting repair.
Description
Technical Field
The invention relates to the field of building materials, in particular to an underwater non-dispersible grouting material for pile foundation repair and a preparation method thereof.
Background
At present, the bored pile is widely applied, but due to the particularity of the construction process, and the influence of a plurality of reasons such as the damage of geology, hydrology, climate, construction materials and construction equipment, the defects of different conditions of the pile foundation are difficult to avoid, the cement-based grouting material is directly applied to the repair and reinforcement of the underwater pile foundation, so that the construction period and the cost of cofferdams, foundation seepage prevention and foundation pit drainage engineering which are necessary for creating construction conditions can be saved, the construction period can be greatly shortened, and the aim of rush repair and rush construction can be fulfilled.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical problems, the invention provides an underwater non-dispersive grouting material for pile foundation repair and a preparation method thereof.
The adopted technical scheme is as follows:
the underwater undispersed grouting material for pile foundation repair comprises the following components:
portland cement, a gel material, a polycarboxylic acid water reducing agent, a cross-linking agent, aggregate, a polymeric flocculant, a plastic expanding agent, an organic silicon defoaming agent and water.
The gel material is a material which can bond loose or block materials into a whole body in the process of changing plastic slurry into hard stone through the physical and chemical action of the gel material, the addition of the gel material into the grouting material can reduce the use of silicate cement, reduce the hydration heat, improve the temperature cracking resistance of the grouting material after curing, strengthen an interface transition region and improve the strength and impermeability, and common gel materials comprise volcanic ash, diatomite, fly ash, slag powder, lime powder, gypsum, water glass and the like.
Further, the paint comprises the following components in parts by weight:
400 portions of Portland cement 350-containing materials, 40-80 portions of gel materials, 5-7 portions of polycarboxylic acid water reducing agent, 0.5-1 portion of cross-linking agent, 600 portions of aggregate 400-containing materials, 1-1.5 portions of polymeric flocculant, 0.1-0.3 portion of plastic expanding agent, 0.2-0.4 portion of organic silicon defoaming agent and 150 portions of water 140-containing materials.
Further, the gel material is a composition of slag powder, iron tailings and an excitant.
Further, the excitant is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide;
the preparation method of the gel material comprises the following steps:
uniformly mixing the iron tailings and calcium hydroxide, roasting at 650-700 ℃ for 1-3h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 20-50 min.
Further, the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide and ammonium persulfate, stirring for 10-30min, adding thioglycolic acid, unsaturated carboxylic acid hydroxy ester, acrylic acid and vitamin C, after finishing dripping, heating to 30-35 ℃, reacting for 2-4h, recovering to room temperature, finally dripping NaOH solution, and adjusting the pH of the system to 6-7.
The unsaturated carboxylic acid hydroxyl ester is at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.
Further, the cross-linking agent is a composition of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide.
Further, the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand.
Further, the polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid are mixed according to the mass ratio of 1-2: 1-2: 2-4, adding dimethyl azodiisobutyrate as an initiator, heating to 70-75 ℃, reacting for 2-3h, and recovering to room temperature.
The invention also provides a preparation method of the underwater non-dispersible grouting material for pile foundation repair, which comprises the following steps:
after the silicate cement, the gel material and the aggregate are uniformly stirred and mixed, adding the polycarboxylic acid water reducing agent, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring for 60-90s at the rotating speed of 140-150r/min, stirring for 30-60s at the rotating speed of 280-300r/min, standing for 90-120s, and finally stirring for 60-120s at the rotating speed of 280-300 r/min.
The invention has the beneficial effects that:
the invention provides a non-dispersive grouting material under water for pile foundation repair, the silicate cement has lower price, compared with the common quick-hardening sulphoaluminate cement and superfine cement of the grouting material, the invention uses slag and iron tailings, under the coupling excitation action of sodium methyl silicate, calcium hydroxide and sodium hydroxide, the activity of the iron tailings and the slag is excited, the sodium hydroxide provides strong alkaline environment, the calcium hydroxide provides calcium ions, the sodium methyl silicate provides silicate groups, the synergistic action of the three promotes the generation of hydrated calcium silicate gel and ettringite, the compactness of the non-dispersive grouting material is improved, the slow-release functional groups in the polycarboxylic acid water reducing agent can be gradually hydrolyzed, carboxyl with stronger adsorbability is gradually released, the water reducing agent adsorbed to the surface of cement particles is gradually increased, the fluidity of the grouting material is shown to be increased, the adsorbability of the water reducing agent is gradually enhanced along with the prolonging of time, the concentration of the water reducing agent on the surfaces of cement particles and hydration products is reduced due to the hydration and adsorption of the cement particles, so that the dispersion retentivity of grouting materials is improved, the slump loss is reduced, the setting time is delayed, the polymeric flocculant is a high-molecular-weight straight-chain polymer, carboxyl, sulfonic group and amide group in the structure have higher polarity and can be adsorbed on the surfaces of gelled materials and aggregate, the materials are fixed in a winding mode to prevent underwater dispersion and scouring, and the cross-linking agent consisting of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide can improve the cohesive force among the components of the gelled materials and between the components and the hydration products of silicate cement and improve the compactness and the anti-erosion capability, and the three cross-linking agents have synergy and have better effect than a single cross-linking agent with the same dosage, the grouting material has high fluidity and excellent mechanical property, has small slump loss within 60min, has initial setting time of more than or equal to 6h and final setting time of more than or equal to 7h, can meet the requirements of underwater pile foundation repair, and can be particularly used for deep hole pile foundation grouting repair.
Detailed Description
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
the underwater undispersed grouting material for pile foundation repair comprises the following components in parts by weight:
350 parts of Portland cement, 50 parts of gel material, 5 parts of polycarboxylic acid water reducing agent, 0.5 part of cross-linking agent, 500 parts of aggregate, 1 part of polymeric flocculant, 0.1 part of plastic expanding agent, 0.2 part of organic silicon defoamer and 150 parts of water.
The gel material is a composition of slag powder, iron tailings and an exciting agent, and the mass ratio of the slag powder to the iron tailings to the exciting agent is 40: 10: 3;
the excitant is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide, and the mass ratio of the sodium methyl silicate to the calcium hydroxide to the sodium hydroxide is 4: 3: 3;
the preparation method of the gel material comprises the following steps:
uniformly mixing iron tailings and calcium hydroxide, roasting at 700 ℃ for 3h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 50 min;
the cross-linking agent is a composition of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide, and the mass ratio of the three is 1: 1: 0.1;
the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand, and the mass ratio of the aggregate to the quartz sand is 1: 1: 0.5;
the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide (30 wt%) and an initiator ammonium persulfate, stirring for 20min, and adding chain transfer agents, namely mercaptoacetic acid, hydroxyethyl acrylate, acrylic acid and a reducing agent, namely vitamin C, wherein the mass ratio of the methyl allyl polyoxyethylene ether to the hydroxyethyl acrylate to the acrylic acid is 15: 1: 1, after the dropwise addition, heating to 35 ℃, reacting for 4 hours, then recovering the room temperature, finally dropwise adding NaOH solution (1 wt%), and adjusting the pH of the system to 7.
The polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid are mixed according to the mass ratio of 1: 1: 3, uniformly mixing, adding dimethyl azodiisobutyrate as an initiator, heating to 75 ℃, reacting for 3 hours, and recovering to room temperature.
The preparation method of the underwater non-dispersible grouting material for pile foundation repair comprises the following steps:
after uniformly stirring and mixing the silicate cement, the gel material and the aggregate, adding the polycarboxylic acid water reducer, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring for 80s at the rotating speed of 150r/min, stirring for 60s at the rotating speed of 300r/min, standing for 120s, and finally stirring for 120s at the rotating speed of 300 r/min.
Example 2:
the underwater undispersed grouting material for pile foundation repair comprises the following components in parts by weight:
380 parts of portland cement, 50 parts of gel material, 5 parts of polycarboxylic acid water reducing agent, 0.5 part of cross-linking agent, 500 parts of aggregate, 1.5 parts of polymeric flocculant, 0.1 part of plastic expanding agent, 0.2 part of organic silicon defoamer and 150 parts of water.
The gel material is a composition of slag powder, iron tailings and an exciting agent, and the mass ratio of the slag powder to the iron tailings to the exciting agent is 40: 10: 3;
the excitant is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide, and the mass ratio of the sodium methyl silicate to the calcium hydroxide to the sodium hydroxide is 4: 3: 3;
the preparation method of the gel material comprises the following steps:
uniformly mixing iron tailings and calcium hydroxide, roasting at 700 ℃ for 1h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 20 min;
the cross-linking agent is a composition of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide, and the mass ratio of the three is 1: 1: 0.1;
the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand, and the mass ratio of the aggregate to the quartz sand is 1: 1: 0.5;
the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide (30 wt%) and initiator ammonium persulfate, stirring for 10min, and adding chain transfer agents consisting of thioglycollic acid, hydroxyethyl acrylate, acrylic acid and reducing agent vitamin C, wherein the mass ratio of the methyl allyl polyoxyethylene ether to the hydroxyethyl acrylate to the acrylic acid is 15: 1: 1, after the dropwise addition, heating to 35 ℃, reacting for 4 hours, then recovering the room temperature, finally dropwise adding NaOH solution (1 wt%), and adjusting the pH of the system to 6.
The polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid are mixed according to the mass ratio of 1: 1: 3, uniformly mixing, adding dimethyl azodiisobutyrate serving as an initiator, heating to 75 ℃, reacting for 2 hours, and recovering to room temperature.
The preparation method of the underwater non-dispersible grouting material for pile foundation repair comprises the following steps:
after uniformly stirring and mixing the silicate cement, the gel material and the aggregate, adding the polycarboxylic acid water reducer, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring at the rotating speed of 140r/min for 90s, then stirring at the rotating speed of 300r/min for 50s, standing for 90s, and finally stirring at the rotating speed of 300r/min for 120 s.
Example 3:
the underwater undispersed grouting material for pile foundation repair comprises the following components in parts by weight:
350 parts of Portland cement, 40 parts of gel material, 5 parts of polycarboxylic acid water reducing agent, 0.5 part of cross-linking agent, 400 parts of aggregate, 1 part of polymeric flocculant, 0.1 part of plastic expanding agent, 0.2 part of organic silicon defoamer and 140 parts of water.
The gel material is a composition of slag powder, iron tailings and an exciting agent, and the mass ratio of the slag powder to the iron tailings to the exciting agent is 40: 10: 3;
the excitant is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide, and the mass ratio of the sodium methyl silicate to the calcium hydroxide to the sodium hydroxide is 4: 3: 3;
the preparation method of the gel material comprises the following steps:
uniformly mixing iron tailings and calcium hydroxide, roasting at 700 ℃ for 3h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 50 min;
the cross-linking agent is a composition of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide, and the mass ratio of the three is 1: 1: 0.1;
the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand, and the mass ratio of the aggregate to the quartz sand is 1: 1: 0.5;
the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide (30 wt%) and initiator ammonium persulfate, stirring for 10min, and adding chain transfer agents consisting of thioglycollic acid, hydroxyethyl acrylate, acrylic acid and reducing agent vitamin C, wherein the mass ratio of the methyl allyl polyoxyethylene ether to the hydroxyethyl acrylate to the acrylic acid is 15: 1: 1, after the dropwise addition, heating to 30 ℃, reacting for 2 hours, then recovering the room temperature, finally dropwise adding NaOH solution (1 wt%), and adjusting the pH of the system to 6.
The polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers, namely 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, are mixed according to the mass ratio of 1: 1: 2, uniformly mixing, adding dimethyl azodiisobutyrate as an initiator, heating to 70 ℃, reacting for 2 hours, and recovering to room temperature.
The preparation method of the underwater non-dispersible grouting material for pile foundation repair comprises the following steps:
after uniformly stirring and mixing the silicate cement, the gel material and the aggregate, adding the polycarboxylic acid water reducer, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring at the rotating speed of 140r/min for 60s, stirring at the rotating speed of 280r/min for 30s, standing for 90s, and finally stirring at the rotating speed of 280r/min for 60 s.
Example 4:
the underwater undispersed grouting material for pile foundation repair comprises the following components in parts by weight:
400 parts of Portland cement, 80 parts of gel material, 7 parts of polycarboxylic acid water reducing agent, 1 part of cross-linking agent, 600 parts of aggregate, 1.5 parts of polymeric flocculant, 0.3 part of plastic expanding agent, 0.4 part of organic silicon defoamer and 150 parts of water.
The gel material is a composition of slag powder, iron tailings and an exciting agent, and the mass ratio of the slag powder to the iron tailings to the exciting agent is 40: 10: 3;
the excitant is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide, and the mass ratio of the sodium methyl silicate to the calcium hydroxide to the sodium hydroxide is 4: 3: 3;
the preparation method of the gel material comprises the following steps:
uniformly mixing iron tailings and calcium hydroxide, roasting at 680 ℃ for 3h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 30 min;
the cross-linking agent is a composition of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide, and the mass ratio of the three is 1: 1: 0.1;
the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand, and the mass ratio of the aggregate to the quartz sand is 1: 1: 0.5;
the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide (30 wt%) and an initiator ammonium persulfate, stirring for 30min, and adding chain transfer agents, namely mercaptoacetic acid, hydroxyethyl acrylate, acrylic acid and a reducing agent, namely vitamin C, wherein the mass ratio of the methyl allyl polyoxyethylene ether to the hydroxyethyl acrylate to the acrylic acid is 15: 1: 1, after the dropwise addition, heating to 35 ℃, reacting for 4 hours, then recovering the room temperature, finally dropwise adding NaOH solution (1 wt%), and adjusting the pH of the system to 7.
The polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid are mixed according to the mass ratio of 1: 1: 2, uniformly mixing, adding dimethyl azodiisobutyrate serving as an initiator, heating to 75 ℃, reacting for 3 hours, and recovering to room temperature.
The preparation method of the underwater non-dispersible grouting material for pile foundation repair comprises the following steps:
after uniformly stirring and mixing the silicate cement, the gel material and the aggregate, adding the polycarboxylic acid water reducer, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring at the rotating speed of 150r/min for 90s, then stirring at the rotating speed of 300r/min for 60s, standing for 120s, and finally stirring at the rotating speed of 300r/min for 120 s.
Example 5:
the underwater undispersed grouting material for pile foundation repair comprises the following components in parts by weight:
350 parts of Portland cement, 80 parts of gel material, 5 parts of polycarboxylic acid water reducing agent, 1 part of cross-linking agent, 400 parts of aggregate, 1.5 parts of polymeric flocculant, 0.1 part of plastic expanding agent, 0.4 part of organic silicon defoamer and 140 parts of water.
The gel material is a composition of slag powder, iron tailings and an exciting agent, and the mass ratio of the slag powder to the iron tailings to the exciting agent is 40: 10: 3;
the excitant is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide, and the mass ratio of the sodium methyl silicate to the calcium hydroxide to the sodium hydroxide is 4: 3: 3;
the preparation method of the gel material comprises the following steps:
uniformly mixing iron tailings and calcium hydroxide, roasting at 650 ℃ for 1h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 50 min;
the cross-linking agent is a composition of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide, and the mass ratio of the three is 1: 1: 0.1;
the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand, and the mass ratio of the aggregate to the quartz sand is 1: 1: 0.5;
the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide (30 wt%) and an initiator ammonium persulfate, stirring for 30min, and adding chain transfer agents, namely mercaptoacetic acid, hydroxyethyl acrylate, acrylic acid and a reducing agent, namely vitamin C, wherein the mass ratio of the methyl allyl polyoxyethylene ether to the hydroxyethyl acrylate to the acrylic acid is 15: 1: 1, after the dropwise addition, heating to 30 ℃, reacting for 4 hours, then recovering to room temperature, finally dropwise adding NaOH solution (1 wt%), and adjusting the pH of the system to 6.
The polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid in a mass ratio of 2: 1: 4, uniformly mixing, adding dimethyl azodiisobutyrate as an initiator, heating to 70 ℃, reacting for 3 hours, and recovering to room temperature.
The preparation method of the underwater non-dispersible grouting material for pile foundation repair comprises the following steps:
after uniformly stirring and mixing the silicate cement, the gel material and the aggregate, adding the polycarboxylic acid water reducer, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring at the rotating speed of 140r/min for 90s, stirring at the rotating speed of 280r/min for 60s, standing for 90s, and finally stirring at the rotating speed of 300r/min for 60 s.
Example 6:
the underwater undispersed grouting material for pile foundation repair comprises the following components in parts by weight:
400 parts of Portland cement, 40 parts of gel material, 7 parts of polycarboxylic acid water reducing agent, 0.5 part of cross-linking agent, 600 parts of aggregate, 1 part of polymeric flocculant, 0.3 part of plastic expanding agent, 0.2 part of organic silicon defoamer and 150 parts of water.
The gel material is a composition of slag powder, iron tailings and an exciting agent, and the mass ratio of the slag powder to the iron tailings to the exciting agent is 40: 10: 3;
the excitant is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide, and the mass ratio of the sodium methyl silicate to the calcium hydroxide to the sodium hydroxide is 4: 3: 3;
the preparation method of the gel material comprises the following steps:
uniformly mixing iron tailings and calcium hydroxide, roasting at 700 ℃ for 2h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 40 min;
the cross-linking agent is a composition of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, diisopropylbenzene hydroperoxide and benzoyl peroxide, and the mass ratio of the three is 1: 1: 0.1;
the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand, and the mass ratio of the aggregate to the quartz sand is 1: 1: 0.5;
the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide (30 wt%) and an initiator ammonium persulfate, stirring for 10min, and adding chain transfer agents, namely mercaptoacetic acid, hydroxyethyl acrylate, acrylic acid and a reducing agent, namely vitamin C, wherein the mass ratio of the methyl allyl polyoxyethylene ether to the hydroxyethyl acrylate to the acrylic acid is 15: 1: 1, after the dropwise addition, heating to 35 ℃, reacting for 2 hours, then recovering the room temperature, finally dropwise adding NaOH solution (1 wt%), and adjusting the pH of the system to 7.
The polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid are mixed according to the mass ratio of 1: 2: 2, uniformly mixing, adding dimethyl azodiisobutyrate as an initiator, heating to 75 ℃, reacting for 2 hours, and recovering to room temperature.
The preparation method of the underwater non-dispersible grouting material for pile foundation repair comprises the following steps:
after uniformly stirring and mixing the silicate cement, the gel material and the aggregate, adding the polycarboxylic acid water reducer, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring at the rotating speed of 150r/min for 60s, then stirring at the rotating speed of 300r/min for 30s, standing for 120s, and finally stirring at the rotating speed of 280r/min for 120 s.
Example 7:
basically the same as example 1, except that the gel material was a fine silica powder.
Example 8:
essentially the same as in example 1, except that the gel material was water glass.
Example 9:
essentially the same as in example 1, except that the gel material was ground slag.
Example 10:
the water reducer is substantially the same as that of example 1, except that the polycarboxylic acid water reducer is a commercially available polycarboxylic acid water reducer (GQ-101, a high-strength new material science and technology Co., Ltd., Shandong).
Example 11:
essentially the same as in example 1, except that the polymeric flocculant was a polyacrylamide flocculant.
Example 12:
essentially the same as example 1 except that the crosslinking agent was 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane.
Example 13:
essentially the same as in example 1, except that the crosslinking agent was dicumyl peroxide.
Example 14:
essentially the same as example 1 except that the crosslinking agent was benzoyl peroxide.
And (3) performance testing:
the grouting materials prepared in examples 1 to 14 of the present invention were subjected to the following performance tests
The fluidity of the grouting material is tested according to GB/T50448-.
And (5) testing the slump, initial setting time and final setting time of the grouting material according to GB/T50080-2016.
The compressive strength of the grouting material was tested in accordance with GB/T17671-1999.
The water-land strength ratio of the grouting material is tested according to DL/T5100-2014.
The test results are shown in tables 1 and 2:
TABLE 1
TABLE 2
As can be seen from the above tables 1 and 2, the grouting materials prepared in the embodiments 1 to 14 of the invention have high fluidity and excellent mechanical properties, the slump loss is small within 60min, the initial setting time is not less than 6h, and the final setting time is not less than 7h, so that the grouting materials can be used for repairing underwater pile foundations, and especially can be used for deep-hole pile foundation grouting repair;
wherein, the comparison between the examples 1 to 6 and the examples 7 to 9 shows that the gel material consisting of the slag powder, the iron tailings and the excitant has better fluidity and better mechanical property after being cured compared with the grouting material prepared by the traditional gel material;
as can be seen from the comparison between examples 1-6 and example 10, compared with the polycarboxylic acid water reducing agent sold in the market at present, the polycarboxylic acid water reducing agent prepared by the invention can increase the fluidity of grouting material, reduce slump loss, prolong setting time and has obvious slow release effect;
compared with the traditional polyacrylamide flocculant, the polymeric flocculant prepared by the invention has better fixing effect on gelled materials and aggregates and can prevent underwater dispersion and scouring of grouting material because polar groups such as carboxyl, sulfonic acid and amide groups in the polymer are more, and the ratio of the compressive strength in water to the strength in water and water of the grouting material after the polymeric flocculant is added is greatly improved;
as can be seen from the comparison between examples 1-6 and examples 12-14, the use of a single cross-linking agent has less influence on the fluidity of the grouting material, but the cross-linking agent can improve the cohesive force among the components of the cementing material, and the mechanical property of the grouting material after curing is reduced after the single cross-linking agent is used, so that the composite use effect of the three cross-linking agents is obviously better than that of the single cross-linking agent with the same dosage.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The underwater undispersed grouting material for pile foundation repair is characterized by comprising the following components:
portland cement, a gel material, a polycarboxylic acid water reducing agent, a cross-linking agent, aggregate, a polymeric flocculant, a plastic expanding agent, an organic silicon defoaming agent and water;
the polymeric flocculant is a polymer of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid, and the molecular weight is more than or equal to 200000;
the preparation method comprises the following steps:
three unsaturated monomers of 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and acrylic acid are mixed according to the mass ratio of 1-2: 1-2: 2-4, adding dimethyl azodiisobutyrate as an initiator, heating to 70-75 ℃, reacting for 2-3h, and recovering to room temperature.
2. The underwater undispersed grouting material for repairing the pile foundation according to claim 1, which comprises the following components in parts by weight:
400 portions of Portland cement 350-containing materials, 40-80 portions of gel materials, 5-7 portions of polycarboxylic acid water reducing agent, 0.5-1 portion of cross-linking agent, 600 portions of aggregate 400-containing materials, 1-1.5 portions of polymeric flocculant, 0.1-0.3 portion of plastic expanding agent, 0.2-0.4 portion of organic silicon defoaming agent and 150 portions of water 140-containing materials.
3. The underwater undispersed grouting material for pile foundation repair according to claim 1, wherein the gel material is a combination of slag powder, iron tailings and a stimulant.
4. The underwater undispersed grouting material for pile foundation repair according to claim 3, wherein the activator is a composition of sodium methyl silicate, calcium hydroxide and sodium hydroxide;
the preparation method of the gel material comprises the following steps:
uniformly mixing the iron tailings and calcium hydroxide, roasting at 650-700 ℃ for 1-3h, and mixing and grinding with sodium methyl silicate, sodium hydroxide and slag powder for 20-50 min.
5. The underwater undispersed grouting material for pile foundation repair according to claim 1, characterized in that the preparation method of the polycarboxylate superplasticizer comprises the following steps:
mixing methyl allyl polyoxyethylene ether and water uniformly, adding hydrogen peroxide and ammonium persulfate, stirring for 10-30min, adding thioglycolic acid, unsaturated carboxylic acid hydroxy ester, acrylic acid and vitamin C, after finishing dripping, heating to 30-35 ℃, reacting for 2-4h, recovering to room temperature, finally dripping NaOH solution, and adjusting the pH of the system to 6-7.
6. The underwater non-dispersible grouting material for pile foundation repair according to claim 5, wherein the unsaturated carboxylic acid hydroxy ester is at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.
7. The underwater undispersed grouting material for pile foundation repair of claim 1, wherein the cross-linking agent is a combination of 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane, dicumyl hydroperoxide, and benzoyl peroxide.
8. The underwater undispersed grouting material for pile foundation repair according to claim 1, wherein the aggregate is a composition of 20-40 mesh quartz sand, 40-70 mesh quartz sand and 70-120 mesh quartz sand.
9. The preparation method of the underwater non-dispersible grouting material for pile foundation repair according to any one of claims 1 to 8 is characterized by comprising the following steps:
after the silicate cement, the gel material and the aggregate are uniformly stirred and mixed, adding the polycarboxylic acid water reducing agent, the cross-linking agent, the aggregate, the polymeric flocculant, the plastic expanding agent, the organic silicon defoaming agent and the water, stirring for 60-90s at the rotating speed of 140-150r/min, stirring for 30-60s at the rotating speed of 280-300r/min, standing for 90-120s, and finally stirring for 60-120s at the rotating speed of 280-300 r/min.
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