CN110668731A - Additive for ocean engineering concrete and preparation method thereof - Google Patents
Additive for ocean engineering concrete and preparation method thereof Download PDFInfo
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- CN110668731A CN110668731A CN201911112563.9A CN201911112563A CN110668731A CN 110668731 A CN110668731 A CN 110668731A CN 201911112563 A CN201911112563 A CN 201911112563A CN 110668731 A CN110668731 A CN 110668731A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Abstract
The invention relates to the field of buildings, in particular to an additive for ocean engineering concrete and a preparation method thereof, wherein the raw materials comprise 100-150 parts of a water reducing agent, 0.5-1 part of tetramethylammonium iodide, 1-5 parts of sodium ethoxide, 3-5 parts of polyacrylamide, 30-50 parts of a surfactant, 15-20 parts of a rust inhibitor, 30-50 parts of an expanding agent, 3-5 parts of a retarder, 6-10 parts of an antifoaming agent and 0-80 parts of water; the invention aims to overcome the defects of the prior art, and provides the admixture for the ocean engineering concrete and the preparation method thereof, which have the effects of reducing water, resisting rust, defoaming and retarding coagulation, and improve the effect; the additive is added into concrete, so that the fluidity of concrete slurry is improved, the retentivity is good, the water reducing rate is high, the density of the concrete is improved, the flocculating property is good, and the friction resistance between liquids can be reduced; the grinding efficiency is improved, and the cement mortar has the characteristics of excellent impermeability, high early strength of quick hardening, high later strength and the like.
Description
Technical Field
The invention relates to the field of buildings, in particular to an additive for ocean engineering concrete and a preparation method thereof.
Background
The cement concrete is a traditional building material, but the traditional concrete with lower strength and single function can not meet the requirements of large-scale structures under special conditions such as marine environment, and none of various maritime works structures built in the world at present, such as a cross-sea bridge, a port and wharf, a submarine tunnel, a coastal high speed, an offshore oil drilling platform, a dock and the like, use reinforced concrete as a main building material and a structural material. The coastline of China is as long as 32000 kilometers, the consumption of concrete is increased rapidly along with the rapid development of national economy and the comprehensive development of infrastructure construction, and the marine structure still takes reinforced concrete materials as the main raw materials in a quite long time in the future.
The marine concrete is widely applied to harbors, wharfs, flood banks and other projects exposed to seawater erosion, and is easily damaged to shorten the durability thereof due to the periodic contact with seawater and the physical and chemical actions of seawater or sea fog, or the actions of sea wave impact, sea sand scouring and the like, so that the main reasons for causing the marine concrete damage are as follows: corrosion of steel bars, freezing damage in cold climates, physicochemical effects of environmental erosion, and the like. According to statistics, the global economic loss caused by seawater corrosion exceeds billions of dollars every year, and Cl is generated in marine environment-And SO4 2-Ions enter the concrete and are accumulated on the surface of the steel bar to promote the steel bar to generate electrochemical corrosion, so that the internal part of the concrete is locally expanded, the concrete is swelled and cracked after stress concentration, and the durability of the concrete is deteriorated.
A great deal of facts show that China has a large number of ocean projects, severe damage occurs in the life period far below the design life period, some ocean projects need to be overhauled or rebuilt within 10-20 years, and some ocean projects need to be completely replaced even within 3-5 years. These important concrete structures are severely aged before they reach their useful life and have to be very costly to repair and rebuild.
The common marine concrete can not meet the requirements of the performance of marine engineering, various admixtures or additives are usually required to be added for optimization, and at present, in the prior art, the additives have various varieties and have a plurality of defects, such as good water reducing effect, but increased bleeding rate and influence on the quality uniformity; or the adaptability to cement varieties is poor, the problem of early setting of concrete is easily caused, and the normal construction of projects is influenced. Therefore, the research of the admixture for the ocean engineering concrete with excellent performance is urgent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the admixture for the ocean engineering concrete and the preparation method thereof, which have the effects of reducing water, resisting rust, defoaming and retarding coagulation and improve the effect; the additive is added into concrete, so that the fluidity of concrete slurry is improved, the retentivity is good, the water reducing rate is high, the density of the concrete is improved, the flocculating property is good, and the friction resistance between liquids can be reduced; the grinding efficiency is improved, and the cement mortar has the characteristics of excellent impermeability, high early strength of quick hardening, high later strength and the like.
The technical scheme of the invention is as follows:
an admixture for ocean engineering concrete comprises the following raw materials in parts by weight:
100-150 parts of a water reducing agent;
0.5-1 part of tetramethyl ammonium iodide;
1-5 parts of sodium ethoxide;
3-5 parts of polyacrylamide;
30-50 parts of a surfactant;
15-20 parts of a rust inhibitor;
30-50 parts of an expanding agent;
3-5 parts of retarder;
6-10 parts of a defoaming agent;
50-80 parts of water.
The water reducing agent is a modified powder polycarboxylic acid high-performance water reducing agent.
The surfactant is a phosphorus amphoteric surfactant.
The rust inhibitor is a baked layered double hydroxide rust inhibitor.
The expanding agent is a special-shaped steel fiber expanding agent; the special-shaped steel fiber expanding agent is a wave-shaped steel fiber expanding agent, an end hook type steel fiber expanding agent, an arch type steel fiber expanding agent, a milling type steel fiber expanding agent or a shearing type steel fiber expanding agent.
The retarder is formed by compounding sodium gluconate and white sugar according to the mass ratio of 3: 2.
The defoaming agent is an organic silicon polyether composite defoaming agent.
The preparation method of the water reducing agent comprises the following steps: mixing cinnamic acid, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid in a weight ratio of cinnamic acid, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid = 0.25: 5: 0.3 is respectively dissolved in 3 parts by weight of deionized water to prepare monomer solutions, 0.25 part by weight of ammonium persulfate is dissolved in 3 parts by weight of deionized water to prepare initiator solutions, a four-neck flask containing 1 part by weight of prenyl polyoxyethylene ether, 3 parts by weight of deionized water, a stirrer and a constant pressure dropping funnel is placed in a water bath kettle, the temperature is raised to 85 ℃, the cinnamic acid monomer solution, the acrylic acid monomer solution, the 2-acrylamide-2-methylpropanesulfonic acid monomer solution and the ammonium persulfate initiator solution are uniformly dropped, the dropping rate of the monomer solutions is 1-1.5 mL/min, the dropping rate of the initiator solutions is 0.5-0.8 mL/min, and the temperature is continuously kept for 2 hours after the dropping is finished; after the reaction is finished, adjusting the temperature to be below 40 ℃, dropwise adding NaOH with the mass fraction of 20% while stirring, and adjusting the pH value to be 7-8 to obtain the polycarboxylic acid water reducer; adding 1 part by weight of nano calcium, nano aluminum and nano silicon into a polycarboxylate superplasticizer at the temperature of 45 ℃, stirring for 30 minutes, drying, and crushing at low temperature to obtain the modified powder polycarboxylate superplasticizer.
The preparation method of the surfactant comprises the following steps:
2.662 parts by weight of methyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept still for liquid separation, the lower layer of viscous liquid is taken, and the composite is the methyl triphenyl phosphonium dodecyl benzene sulfonate.
2.662 parts by weight of ethyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept still for liquid separation, the lower layer of viscous liquid is taken, and the composite is the ethyl triphenyl phosphonium dodecyl benzene sulfonate.
2.662 parts by weight of propyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept still for liquid separation, the lower layer of viscous liquid is taken, and the composite is the propyl triphenyl phosphonium dodecyl benzene sulfonate.
2.662 parts by weight of butyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept still for liquid separation, the lower layer of viscous liquid is taken, and the composite is the butyl triphenyl phosphonium dodecyl benzene sulfonate.
And uniformly mixing the dodecylbenzene sulfonic acid methyl triphenyl phosphine, the dodecylbenzene sulfonic acid ethyl triphenyl phosphine, the dodecylbenzene sulfonic acid propyl triphenyl phosphine and the dodecylbenzene sulfonic acid butyl triphenyl phosphine to obtain the phosphorus amphoteric surfactant.
The rust inhibitor is prepared by putting 36-40 parts by mass of magnesium-aluminum hydrotalcite into a high-temperature silicon-molybdenum furnace, roasting at 500-800 ℃, keeping the temperature for 5 hours at the heating rate of 4 ℃/min, cooling for 30 minutes, taking out, cooling to room temperature, crushing, grinding, and sieving with a 250-mesh sieve; and sequentially adding 5-7 parts by weight of dimethylethanolamine, 18-20 parts by weight of diethanolamine and 23-25 parts by weight of saturated calcium hydroxide aqueous solution, and stirring for 30 minutes to obtain the rust inhibitor.
The preparation method of the additive for the ocean engineering concrete comprises the following steps:
(1) adding tetramethylammonium iodide, sodium ethoxide and polyacrylamide into mixing water according to parts by weight, stirring and dissolving, putting into a grinding machine, grinding uniformly, and then putting into a stirring machine, and fully stirring for 10-15 min to obtain a solution A;
(2) and (3) placing the solution A in a water bath at constant temperature, sequentially adding a water reducing agent, a surfactant, a rust inhibitor, an expanding agent, a retarder and a defoaming agent in parts by weight, and uniformly stirring the mixture, wherein the water bath temperature is 35-40 ℃, so as to obtain the additive for the ocean engineering concrete.
Compared with the prior art, the invention has the prominent substantive characteristics and remarkable progress that:
1. the water reducing agent is a polycarboxylate water reducing agent, and is synthesized by taking ammonium persulfate as an initiator and taking acrylic acid, cinnamic acid, isopentenol polyoxyethylene ether and 2-acrylamide-2-methylpropanesulfonic acid as reaction monomers through free radical copolymerization.
In the water reducing agent, an initiator can influence the reaction rate and the molecular weight of the generated polycarboxylic acid water reducing agent, when the initiator content is low, the initiator for initiating monomer polymerization is too little due to consumption of a polymerization inhibitor, so that the product has too high molecular weight, a large amount of monomers cannot participate in the reaction, and the water reducing performance of the water reducing agent is poor. With the increase of the content of the initiator, the polymerization degree of the water reducing agent is reduced, the chain length is moderate, and the water reducing agent can well play a role. When the dosage of the initiator exceeds a certain proportion, the molecular weight of the product is too small, the steric hindrance is reduced, the effect of dispersing cement particles cannot be well played, and the fluidity of slurry is poor. The invention adopts ammonium persulfate as an initiator, the persulfate is decomposed to generate free radicals, then the free radicals excite monomers to form monomer free radicals, the free radicals cannot enter a molecular formula in the process, and ammonia gas cannot be generated by adjusting pH and adding NaOH.
According to the invention, cinnamic acid is added into a polycarboxylic acid water reducing agent, the cinnamic acid contains benzene rings and carboxyl, the steric hindrance of polycarboxylic acid molecules is increased, so that the adsorption force between concrete layers is weakened, and more water reducing agents can play a role in dispersing, thereby greatly improving the fluidity of slurry.
The polycarboxylic acid water reducing agent selects the acrylic acid because of the acid-ether ratio, which is the ratio of the amount of acrylic acid and the amount of macromolecular monomer foaming substances, and influences the side chain density and the charge density of the polycarboxylic acid water reducing agent, so the acid-ether ratio has important influence on the polycarboxylic acid water reducing agent. The acid-ether ratio of the cement paste is 5:1, and the flow property of the cement paste is optimal.
The reaction temperature of the polycarboxylic acid water reducing agent is also important, when the reaction temperature is low, the rate of generating free radicals by decomposing the initiator is low, the polymerization reaction rate is slow, a large amount of monomer residues exist, and the synthesized water reducing agent has low molecular weight and poor performance. When the reaction temperature is too high, the half-life period of the initiator is short, the initiation rate is high, the monomers easy to polymerize are rapidly polymerized, the functional group of the water reducing agent is single, and the dispersibility is poor. The selection temperature of the invention is 85 ℃, the concrete net slurry fluidity is highest, and the retentivity is good.
The selected polycarboxylate superplasticizer is a comb-shaped high-molecular compound, contains carboxyl, hydroxyl, benzene ring and other groups in a molecular structure, and has the advantages of no environmental pollution, good adjustability of structure and performance, high water-reducing rate, good plasticity retention and the like.
2. According to the invention, tetramethylammonium iodide is added into the concrete admixture, tetramethylammonium iodide molecules are directionally arranged on a gas-liquid interface, so that on one hand, a monomolecular adsorption film is formed on the surface of concrete particles, the direct contact area between solid particles is reduced, the workability of concrete is improved, on the other hand, the surface tension of a solution is remarkably reduced, the bubble amount in the concrete mixing process is increased, and further, the water consumption for concrete mixing is reduced.
3. The sodium ethoxide in the additive can increase the alkalinity of a system and improve the critical concentration of chloride ions. The alkalinity of the concrete is maintained above the pH value of 11 for a long time, and a layer of stable passive film is arranged on the surface of the reinforcing steel bar, so that the anode reaction is difficult to carry out, and the corrosion of the reinforcing steel bar is prevented.
4. According to the invention, polyacrylamide is selected to be added into the concrete additive, the polyacrylamide is a water-soluble high molecular polymer, the long molecular chain structure of an organic high molecular polymer and the self-rotation property of a bond or a chain segment in macromolecules, the density of concrete can be improved in the concrete, the concrete additive has good flocculation property, and the friction resistance between liquids can be reduced.
5. The invention relates to a surfactant, which is a phosphorus amphoteric surfactant, and is prepared by reacting four cationic surfactants such as alkyl triphenyl phosphonium bromide and the like with a sodium dodecyl benzene sulfonate anionic surfactant to prepare four ionic liquid phosphorus amphoteric surfactants, and mixing the four ionic liquid phosphorus amphoteric surfactants. The simple anionic and cationic surfactants have no obvious grinding aid effect, the ionic liquid prepared by the reaction of the phosphorus surfactant and the sodium dodecyl benzene sulfonate anionic surfactant shows excellent grinding aid effect, and the effect obtained by mixing the four ionic liquid type phosphorus amphoteric surfactants together is better. The phosphorus amphoteric surfactant can change the physicochemical property of the particle surface, reduce the free energy, weaken the surface strength, effectively inhibit the reaggregation of particles and reduce the ball pasting phenomenon, thereby improving the grinding efficiency.
6. The novel roasted layered double hydroxide rust inhibitor is prepared by compounding the magnesium-aluminum hydrotalcite serving as a main material with dimethyl ethanolamine, diethanol amine and a saturated calcium hydroxide aqueous solution, wherein steel bar corrosion is an important cause for the durability deterioration of a concrete structure, and chloride corrosion is one of important factors for causing the corrosion of steel bars in concrete. When the chloride ions of the chloride ions reach a certain amount, even if the concrete reinforcing steel bar is wrapped by strong alkali, the chloride ions can dissolve a passivation film on the surface of the reinforcing steel bar, so that the reinforcing steel bar is corroded. Therefore, the use of rust inhibiting materials has become an important measure for inhibiting the corrosion of steel reinforcement inside concrete structures.
Because the layered double hydroxide has stronger structure memory effect and anion exchange capacity, the crystallinity of the calcined magnalium hydrotalcite is obviously reduced, and the invention is added into the reinforced concrete, the potential value of the reinforcing steel bar basically keeps stable, which indicates that the reinforcing steel bar passive film is good.
Cl-The atomic radius of the gel is small, the gel can easily enter the surface of the C-S-H gel, and the gel is adsorbed with cement hydration products with positive electricity under the action of the coulomb attraction of the charges to balance the charges. The ion adsorption capacity in the electric double layer depends mainly on the surface area of the C-S-H gel, the electric potential between the compact layer and the diffusion layer. At the same time, Ca in the pore solution is found2+Determines the potential between the diffusion layers and thereby affects the physical adsorption of chloride ions. 23-25 parts of saturated calcium hydroxide solution is mixed in the rust inhibitor, and the rust inhibitor is mixed in the pore solution after the cement-based material is mixed in the rust inhibitorCa2+The concentration of the C-S-H gel is effectively improved, and the physical adsorption capacity of the C-S-H gel is improved.
7. The expanding agent of the invention selects the special-shaped steel fiber expanding agent, is doped into concrete, and after cement is hydrated and expanded, the concrete forms pre-stress under the action of the limited expansion of the steel fiber, thus forming self-stress steel fiber reinforced concrete. The incorporation of the steel fiber expanding agent can greatly improve the tensile strength of the concrete matrix although the self-stress value is reduced, and the comprehensive effect is that the tensile bearing capacity of the test piece is greatly improved, which is much safer and more reliable than the method of improving the self-stress value by increasing the expansion deformation capacity of the concrete to improve the crack resistance and bearing capacity of the structure. The self-stress concrete mainly aims at improving bearing load, has the effect of reducing concrete cracks, and has the characteristics of superior impermeability, high early strength and later strength in rapid hardening and the like compared with common concrete.
The breaking strength, the shearing strength, the splitting tensile strength and the bending toughness of the concrete can be obviously improved, the dry shrinkage value is reduced, and the early plastic cracking is also obviously reduced; the fracture toughness of the concrete is improved, the thickness of the pavement or the bridge deck is reduced, and the wind blowing resistance, the drying shrinkage cracking resistance and the plastic shrinkage cracking resistance of the concrete in the early curing stage are improved.
8. The retarder is formed by compounding sodium gluconate and white sugar according to the mass ratio of 3:2, improves the workability of concrete and has excellent slump retaining capacity. Can be used in alkaline medium of cement hydration product and free Ca2+Forming unstable complex, and reducing Ca in liquid phase at early stage of hydration2+The concentration of the water-soluble polymer delays the crystallization of CH, and meanwhile, the water-soluble polymer can be adsorbed on the surface of cement hydrated particles to generate hydrogen bonds with oxygen ions in a silicon-rich layer, so that a layer of protective film is formed on the surface of the cement particles to inhibit the hydration reaction of the cement particles, and the delayed coagulation effect is generated. As the hydration process proceeds, the unstable complex decomposes the cement automatically, and the hydration continues to proceed normally without affecting the later hydration of the cement. Can improve the dispersibility of the water reducing agent, prolong the setting time of concrete and does not influence the development of the strength of the concrete.
9. The defoaming agent adopts the organic silicon polyether composite defoaming agent, has self-emulsifying property, can automatically recover the emulsion state after being sterilized at high temperature, does not break emulsion, float oil and delaminate in a foaming system, has excellent performances of high temperature resistance, high pressure resistance, acid resistance, alkali resistance, shear resistance, quick defoaming and lasting foam inhibition, is uniformly dispersed in the foaming system, has obvious defoaming and foam inhibition effects, and can meet the defoaming and foam inhibition requirements with high performance-price ratio by using less dosage compared with the common organic silicon defoaming agent with the same specification.
Detailed Description
The present invention is further described with reference to the following embodiments, which are only preferred embodiments of the present invention and not intended to limit the present invention in other forms, and any person skilled in the art may change or modify the technical content disclosed above into equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the present invention, unless they depart from the technical spirit of the present invention.
Example 1
An admixture for ocean engineering concrete comprises the following raw materials in parts by weight: 100 parts of a water reducing agent; 0.5 part of tetramethylammonium iodide; 1 part of sodium ethoxide; 3 parts of polyacrylamide; 30 parts of a surfactant; 15 parts of a rust inhibitor; 30 parts of an expanding agent; 3 parts of a retarder; 6 parts of a defoaming agent; 50 parts of water.
The preparation method of the additive for the ocean engineering concrete comprises the following steps:
(1) adding tetramethylammonium iodide, sodium ethoxide and polyacrylamide into the mixing water according to the weight parts, stirring and dissolving, putting into a grinding machine, grinding uniformly, putting into a stirring machine, and stirring fully for 10min to obtain a solution A;
(2) and (3) placing the solution A in a water bath at constant temperature, sequentially adding a water reducing agent, a surfactant, a rust inhibitor, an expanding agent, a retarder and a defoaming agent in parts by weight, and uniformly stirring the mixture, wherein the water bath temperature is 35 ℃, so as to obtain the additive for the ocean engineering concrete.
Example 2
An admixture for ocean engineering concrete comprises the following raw materials in parts by weight: 150 parts of a water reducing agent; 1 part of tetramethyl ammonium iodide; 5 parts of sodium ethoxide; 5 parts of polyacrylamide; 50 parts of a surfactant; 20 parts of a rust inhibitor; 50 parts of an expanding agent; 5 parts of a retarder; 10 parts of a defoaming agent; 80 parts of water.
The preparation method of the additive for the ocean engineering concrete comprises the following steps:
(1) adding tetramethylammonium iodide, sodium ethoxide and polyacrylamide into the mixing water according to the weight parts, stirring and dissolving, putting into a grinding machine, grinding uniformly, putting into a stirring machine, and stirring fully for 13min to obtain a solution A;
(2) and (3) placing the solution A in a water bath at constant temperature, sequentially adding a water reducing agent, a surfactant, a rust inhibitor, an expanding agent, a retarder and a defoaming agent in parts by weight, and uniformly stirring the mixture, wherein the water bath temperature is 38 ℃, so as to obtain the additive for the ocean engineering concrete.
Example 3
An admixture for ocean engineering concrete comprises the following raw materials in parts by weight: 125 parts of a water reducing agent; 0.7 part of tetramethylammonium iodide; 3 parts of sodium ethoxide; 4 parts of polyacrylamide; 40 parts of a surfactant; 17 parts of a rust inhibitor; 40 parts of an expanding agent; 4 parts of a retarder; 8 parts of a defoaming agent; and 75 parts of water.
The preparation method of the additive for the ocean engineering concrete comprises the following steps:
(1) adding tetramethylammonium iodide, sodium ethoxide and polyacrylamide into the mixing water according to the weight parts, stirring and dissolving, putting into a grinding machine, grinding uniformly, putting into a stirring machine, and stirring fully for 15min to obtain a solution A;
(2) and (3) placing the solution A in a water bath at constant temperature, sequentially adding a water reducing agent, a surfactant, a rust inhibitor, an expanding agent, a retarder and a defoaming agent in parts by weight, and uniformly stirring the mixture at the water bath temperature of 40 ℃ to obtain the additive for the ocean engineering concrete.
Example 4
An admixture for ocean engineering concrete comprises the following raw materials in parts by weight: 140 parts of a water reducing agent; 0.8 part of tetramethylammonium iodide; 3 parts of sodium ethoxide; 4 parts of polyacrylamide; 45 parts of a surfactant; 18 parts of a rust inhibitor; 45 parts of an expanding agent; 5 parts of a retarder; 8 parts of a defoaming agent; 70 parts of water.
The preparation method of the additive for the ocean engineering concrete comprises the following steps:
(1) adding tetramethylammonium iodide, sodium ethoxide and polyacrylamide into the mixing water according to the weight parts, stirring and dissolving, putting into a grinding machine, grinding uniformly, putting into a stirring machine, and stirring fully for 15min to obtain a solution A;
(2) and (3) placing the solution A in a water bath at constant temperature, sequentially adding a water reducing agent, a surfactant, a rust inhibitor, an expanding agent, a retarder and a defoaming agent in parts by weight, and uniformly stirring the mixture, wherein the water bath temperature is 35 ℃, so as to obtain the additive for the ocean engineering concrete.
Compared with the market admixture, the performance is as follows:
Claims (8)
1. the admixture for the ocean engineering concrete is characterized by comprising the following raw materials in parts by weight:
100-150 parts of a water reducing agent;
0.5-1 part of tetramethyl ammonium iodide;
1-5 parts of sodium ethoxide;
3-5 parts of polyacrylamide;
30-50 parts of a surfactant;
15-20 parts of a rust inhibitor;
30-50 parts of an expanding agent;
3-5 parts of retarder;
6-10 parts of a defoaming agent;
50-80 parts of water;
the preparation method of the additive for the ocean engineering concrete comprises the following steps:
(1) adding tetramethylammonium iodide, sodium ethoxide and polyacrylamide into mixing water according to parts by weight, stirring and dissolving, putting into a grinding machine, grinding uniformly, and then putting into a stirring machine, and fully stirring for 10-15 min to obtain a solution A;
(2) and (3) placing the solution A in a water bath at constant temperature, sequentially adding a water reducing agent, a surfactant, a rust inhibitor, an expanding agent, a retarder and a defoaming agent in parts by weight, and uniformly stirring the mixture, wherein the water bath temperature is 35-40 ℃, so as to obtain the additive for the ocean engineering concrete.
2. The admixture for ocean engineering concrete according to claim 1, wherein the water reducing agent is a modified powder polycarboxylic acid high-performance water reducing agent; the surfactant is a phosphorus amphoteric surfactant; the rust inhibitor is a baked layered double hydroxide rust inhibitor.
3. The admixture for ocean engineering concrete according to claim 1, wherein the expanding agent is a deformed steel fiber expanding agent; the special-shaped steel fiber expanding agent is a wave-shaped steel fiber expanding agent, an end hook type steel fiber expanding agent, an arch type steel fiber expanding agent, a milling type steel fiber expanding agent or a shearing type steel fiber expanding agent.
4. The admixture for ocean engineering concrete according to claim 1, wherein the retarder is formed by compounding sodium gluconate and white sugar according to a mass ratio of 3: 2.
5. The admixture for ocean engineering concrete according to claim 1, wherein the defoaming agent is a silicone polyether composite defoaming agent.
6. The admixture for ocean engineering concrete according to claim 1, wherein the preparation method of the water reducing agent comprises the following steps: mixing cinnamic acid, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid in a weight ratio of cinnamic acid, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid = 0.25: 5: 0.3 is respectively dissolved in 3 parts by weight of deionized water to prepare monomer solutions, 0.25 part by weight of ammonium persulfate is dissolved in 3 parts by weight of deionized water to prepare initiator solutions, a four-neck flask containing 1 part by weight of prenyl polyoxyethylene ether, 3 parts by weight of deionized water, a stirrer and a constant pressure dropping funnel is placed in a water bath kettle, the temperature is raised to 85 ℃, the cinnamic acid monomer solution, the acrylic acid monomer solution, the 2-acrylamide-2-methylpropanesulfonic acid monomer solution and the ammonium persulfate initiator solution are uniformly dropped, the dropping rate of the monomer solutions is 1-1.5 mL/min, the dropping rate of the initiator solutions is 0.5-0.8 mL/min, and the temperature is continuously kept for 2 hours after the dropping is finished; after the reaction is finished, adjusting the temperature to be below 40 ℃, dropwise adding NaOH with the mass fraction of 20% while stirring, and adjusting the pH value to be 7-8 to obtain the polycarboxylic acid water reducer; adding 1 part by weight of nano calcium, nano aluminum and nano silicon into a polycarboxylate superplasticizer at the temperature of 45 ℃, stirring for 30 minutes, drying, and crushing at low temperature to obtain the modified powder polycarboxylate superplasticizer.
7. The admixture for ocean engineering concrete according to claim 1, wherein the preparation method of the surfactant comprises the following steps:
2.662 parts by weight of methyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept stand and separated, the lower layer of viscous liquid is taken, and the composite is the methyl triphenyl phosphonium dodecyl benzene sulfonate;
2.662 parts by weight of ethyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept stand and separated, the lower layer of viscous liquid is taken, and the composite is ethyl triphenyl phosphonium dodecyl benzene sulfonate;
2.662 parts by weight of propyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept still for liquid separation, the lower layer of viscous liquid is taken, and the composite is dodecyl benzene sulfonic acid propyl triphenyl phosphonium;
2.662 parts by weight of butyl triphenyl phosphonium bromide is taken to be added into 25 parts by weight of distilled water, 2.715 parts by weight of sodium dodecyl benzene sulfonate is added into the distilled water, the mixture is placed into a magnetic stirrer and is rapidly stirred for 4 hours, the mixture is kept still for liquid separation, the lower layer of viscous liquid is taken, and the composite is the butyl triphenyl phosphonium dodecyl benzene sulfonate;
and uniformly mixing the dodecylbenzene sulfonic acid methyl triphenyl phosphine, the dodecylbenzene sulfonic acid ethyl triphenyl phosphine, the dodecylbenzene sulfonic acid propyl triphenyl phosphine and the dodecylbenzene sulfonic acid butyl triphenyl phosphine to obtain the phosphorus amphoteric surfactant.
8. The admixture for the ocean engineering concrete according to claim 1, wherein the corrosion inhibitor is prepared by putting 36-40 parts by mass of magnesium-aluminum hydrotalcite into a high-temperature silicon-molybdenum furnace, roasting at 500-800 ℃, heating at a rate of 4 ℃/min, keeping the temperature for 5h, cooling for 30 min, taking out, cooling to room temperature, crushing, grinding, and sieving with a 250-mesh sieve; and sequentially adding 5-7 parts by mass of dimethylethanolamine, 18-20 parts by mass of diethanolamine and 23-25 parts by mass of saturated calcium hydroxide aqueous solution, and stirring for 30 minutes to obtain the rust inhibitor.
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Cited By (5)
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| CN112047660A (en) * | 2020-08-25 | 2020-12-08 | 北京金隅水泥节能科技有限公司 | Grinding aid and production process and application thereof |
| CN114316134A (en) * | 2022-01-28 | 2022-04-12 | 山西大学 | High-temperature retarder for geothermal cementing of hot dry rock and preparation method and application thereof |
| CN114315206A (en) * | 2021-12-28 | 2022-04-12 | 江苏海能电力设计咨询有限责任公司 | Reinforced concrete anti-corrosion additive and preparation method thereof |
| CN116655282A (en) * | 2023-06-07 | 2023-08-29 | 日照市海洋工程研究院 | Ocean engineering chloride ion resistant agent and preparation method thereof |
| CN117550871A (en) * | 2024-01-12 | 2024-02-13 | 陕西驭腾能源环保科技股份有限公司 | Heat conducting material and preparation method and application thereof |
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| CN106927713A (en) * | 2017-04-06 | 2017-07-07 | 日照市海洋工程研究院 | A kind of maritime concrete anti-crack and anti-seepage additive |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112047660A (en) * | 2020-08-25 | 2020-12-08 | 北京金隅水泥节能科技有限公司 | Grinding aid and production process and application thereof |
| CN112047660B (en) * | 2020-08-25 | 2021-07-09 | 北京金隅水泥节能科技有限公司 | Grinding aid and production process and application thereof |
| CN114315206A (en) * | 2021-12-28 | 2022-04-12 | 江苏海能电力设计咨询有限责任公司 | Reinforced concrete anti-corrosion additive and preparation method thereof |
| CN114316134A (en) * | 2022-01-28 | 2022-04-12 | 山西大学 | High-temperature retarder for geothermal cementing of hot dry rock and preparation method and application thereof |
| CN114316134B (en) * | 2022-01-28 | 2023-03-07 | 山西大学 | High-temperature retarder for geothermal cementing of hot dry rock and preparation method and application thereof |
| CN116655282A (en) * | 2023-06-07 | 2023-08-29 | 日照市海洋工程研究院 | Ocean engineering chloride ion resistant agent and preparation method thereof |
| CN116655282B (en) * | 2023-06-07 | 2024-02-27 | 日照市海洋工程研究院 | Ocean engineering chloride ion resistant agent and preparation method thereof |
| CN117550871A (en) * | 2024-01-12 | 2024-02-13 | 陕西驭腾能源环保科技股份有限公司 | Heat conducting material and preparation method and application thereof |
| CN117550871B (en) * | 2024-01-12 | 2024-03-19 | 陕西驭腾能源环保科技股份有限公司 | Heat conducting material and preparation method and application thereof |
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Application publication date: 20200110 |