CN114573286B - Durable and stable steel slag cement concrete and preparation process thereof - Google Patents
Durable and stable steel slag cement concrete and preparation process thereof Download PDFInfo
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- CN114573286B CN114573286B CN202111593388.7A CN202111593388A CN114573286B CN 114573286 B CN114573286 B CN 114573286B CN 202111593388 A CN202111593388 A CN 202111593388A CN 114573286 B CN114573286 B CN 114573286B
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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
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- 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
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- 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
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Abstract
The invention discloses a durable and stable steel slag cement concrete and a preparation process thereof, and relates to the technical field of cement concrete. The steel slag cement concrete is prepared from the following components in parts by weight: 35 to 50 parts of Portland cement, 40 to 62 parts of modified converter steel slag powder, 50 to 76 parts of medium sand, 62 to 85 parts of gravel, 1.5 to 3.2 parts of polycarboxylic acid water reducing agent and 25 to 60 parts of water. The macromolecular reticular structure of the invention permeates into the steel slag powder mixed material, improves the hydrophilicity, promotes the coagulation and accelerates the hydration degree, and after stirring and grinding, free calcium oxide and magnesium oxide are further crushed and pulverized to eliminate the volume expansion stress; the modified converter steel slag powder reduces the production cost, meets the gel effect, and simultaneously meets the requirements on compressive strength, durability, frost resistance and impermeability. The polycarboxylate superplasticizer achieves the effect of accelerating the cement dispersion, improves the compressive strength of concrete, and avoids the strength loss in the long-term use process.
Description
Technical Field
The invention relates to the technical field of cement concrete, in particular to durable and stable steel slag cement concrete and a preparation process thereof.
Background
As a common material for modern civil engineering, the concrete has the characteristics of easy casting construction forming, high strength, excellent durability and the like. However, the production of concrete requires the use of large amounts of cement. The production of cement not only consumes a large amount of resources, but also consumes energy. The steel slag is used as industrial solid waste in the steel-making industry, is massively piled in an open field, and causes harm to the surrounding environment. Because of the mineral composition characteristics of the steel slag, the steel slag has the gel characteristic, and can generate hydrated calcium silicate gel after being mixed with water, which is similar to the properties of cement, and therefore, the steel slag can be used as a substitute material of the cement. When the steel slag is used as a cementing substitute material, some problems exist, such as low hydration degree and slow hydration rate of the steel slag; the chemical components of the steel slag are greatly influenced by raw materials and a steel-making process; free calcium oxide and free magnesium oxide in steel slag may cause expansion cracking of concrete.
The patent publication No. CN109437639A discloses a steel slag concrete reinforcing agent and a steel slag reinforced concrete material, wherein the steel slag concrete reinforcing agent is prepared by the following method: one or more of dilute sulfuric acid, acetic acid and carbonic acid is used as a pretreatment solution, and the steel slag powder is soaked in the pretreatment solution and dried to obtain the steel slag concrete reinforcing agent. The steel scoric concrete reinforcing agent is doped into a concrete raw material to obtain the steel scoric reinforced concrete material. The steel slag powder is treated by the pretreatment liquid, so that the expansion generated by CaO and MgO can be effectively controlled, and after the steel slag powder is added into a cement concrete material, the contractibility of cement can be reduced; meanwhile, the crystal formed on the surface of the steel slag after treatment is beneficial to other components in the concrete to form a good connection interface, plays a role in enhancing and improves the mechanical strength of the cement to a certain extent. However, the cement concrete using the steel slag powder in the prior art can not meet the requirements of compressive strength, durability, frost resistance and impermeability while meeting the gel effect, and can avoid the strength loss in the long-term use process.
A solution is now proposed to address the technical drawbacks in this respect.
Disclosure of Invention
The invention aims to provide a steel slag cement concrete with durability and stability and a preparation process thereof, which are used for solving the technical problems that the prior art can not meet the requirements of compressive strength, durability, frost resistance and impermeability while meeting the gel effect, and the strength loss in the long-term use process is avoided.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a steel slag cement concrete with durability and stability, which is prepared from the following components in parts by weight: 35 to 50 portions of Portland cement, 40 to 62 portions of modified converter steel slag powder, 50 to 76 portions of medium sand, 62 to 85 portions of gravel, 1.5 to 3.2 portions of polycarboxylic acid water reducing agent and 25 to 60 portions of water;
the preparation process of the modified converter steel slag powder comprises the following steps: preparing a swelling modifier from polyacrylamide resin and hydroxy acrylic resin under the action of an initiator; heating the converter steel slag powder, adding diatomite and fly ash, crushing and sieving to obtain a steel slag powder mixed material; after the steel slag powder mixture is subjected to pressure-maintaining thermal braising treatment, stirring and grinding with an expansion modifier;
the polycarboxylate superplasticizer is prepared by carrying out free radical polymerization reaction on methyl allyl polyoxyethylene ether and a 3-phenyl acrylic monomer under the conditions of a chain transfer agent sodium methallyl sulfonate and an initiator sodium persulfate, and adjusting the pH value and the solid content.
The preparation method of the modified converter steel slag powder has gel characteristics by considering the mineral component characteristics of the steel slag, can generate hydrated calcium silicate gel after being mixed with water, but has low hydration degree, and the free calcium oxide and magnesium oxide in the hydrated calcium silicate gel easily cause the hardened concrete to expand and crack, thereby causing the durability problem. When the modified converter slag powder is prepared, the polyacrylamide resin belongs to a water-soluble high-molecular polymer, and the molecular chain contains a certain proportion of polar amide groups, so that solid particles suspended in water can be adsorbed, and the particles are bridged or coagulated to form large flocculates through charge neutralization; the hydroxyl acrylic resin has good hardness, weather resistance and chemical resistance, and the polyacrylamide resin and the hydroxyl acrylic resin are subjected to free radical polymerization reaction under the action of a free radical initiator benzoyl peroxide to obtain a macromolecular network structure which has alcohol amine groups and good hydrophilicity and condensation effect. In the process of heating and crushing the converter steel slag powder, the diatomite and the fly ash, low-boiling impurities in the converter steel slag powder are removed, and the smooth surface, compact micropores and high specific surface area of the diatomite and the fly ash are easy to disperse in the converter steel slag powder, so that the endothermic cracking and refining of the converter steel slag powder are promoted; steam more easily enters into the cracked and refined converter steel slag powder in the process of thermal braising treatment, so that free calcium oxide and magnesium oxide generate volume expansion stress, after the expansion modifier is added, a macromolecular reticular structure with good hydrophilicity and condensation effect permeates into the mixed material of the steel slag powder, the hydrophilicity of the steel slag powder is improved, the condensation is promoted, the hydration degree is accelerated, the free calcium oxide and the free magnesium oxide are further crushed and pulverized after stirring and grinding, the volume expansion stress is eliminated, and the problem of durability caused by expansion cracking of hardened concrete is not easily caused while the gel effect is improved in the preparation of the concrete.
Further, the preparation method of the modified converter steel slag powder comprises the following steps:
1) Adding 25-50 parts by weight of polyacrylamide resin and 12-30 parts by weight of hydroxyl acrylic resin into deionized water, heating to 45-65 ℃, dropwise adding an initiator benzoyl peroxide, keeping the temperature and stirring for 2-3 hours after dropwise adding to obtain a mixed solution, decompressing and dewatering the mixed solution, and drying at 50-60 ℃ to obtain an expansion modifier;
2) Placing the converter steel slag powder into a closed stirrer, heating to 650-720 ℃, adding diatomite and fly ash, stirring uniformly, naturally cooling to room temperature, crushing, and sieving with a 20-30-mesh sieve to obtain a steel slag powder mixed material;
3) Heating the mixed material of the steel slag powder to 70-85 ℃, spraying water, then carrying out thermal braising treatment, and continuously spraying water to keep the pressure in the closed stirrer between 0.3-0.5 MPa; adding an expansion modifier accounting for 1-3% of the weight of the mixed material of the steel slag powder, stirring and grinding the mixture until the particle size is less than 100 mu m to obtain the modified converter steel slag powder.
Further, the polyacrylamide resin is white powder with the molecular weight of 1200-1500 ten thousand, the ionicity is less than 3%, and the residual monomer is less than or equal to 0.05%; the viscosity of the hydroxy acrylic resin is 60-100S, the solid content is 70 +/-2%, the hydroxyl value is 100-120, and the dosage of the initiator is 0.1-0.6% of the weight of the polyacrylamide resin.
Further, the weight ratio of the steel slag powder to the diatomite to the fly ash is 20-30: 3 to 6:1.
further, the preparation method of the polycarboxylate water reducer comprises the following steps:
adding methyl allyl polyoxyethylene ether and sodium methallyl sulfonate into a reaction kettle equipped with a mechanical stirring dropping funnel, heating the water bath to 80-90 ℃, stirring until the system is clear, respectively dropping an ammonium persulfate aqueous solution and a 3-phenyl acrylic acid aqueous solution into the dropping funnel, keeping the ammonium persulfate aqueous solution and the 3-phenyl acrylic acid aqueous solution being completely dropped within 1-2 hours, keeping the temperature for 2-3 hours after the dropping is completed, reacting for 2-3 hours after the dropping is completed, cooling the reactant to 30-40 ℃, neutralizing by using 30-40 wt% of a sodium hydroxide solution, adjusting the pH value to 6-8, and adding a proper amount of deionized water to obtain the polycarboxylic acid water reducer with the solid content of 40-45%.
The synthesis principle of the polycarboxylate superplasticizer is as follows:
the polycarboxylate water reducer adopts methyl allyl polyoxyethylene ether and 3-phenyl acrylic acid as raw materials, sodium methallyl sulfonate as a chain transfer agent, ammonium persulfate as a free radical initiator, and the use amount of the components, the reaction temperature and the reaction time are strictly controlled to obtain the polycarboxylate water reducer with excellent performance. When concrete is prepared, the uneven charge distribution exists on the surface of hydrated cement due to the difference of mineral phases in portland cement, a large number of polycarboxylic acid molecules are adsorbed due to the electrostatic interaction between the surfaces of cement particles and polycarboxylic acid molecules, a large number of calcium ions are generated in the cement hydration process, the adsorption of the polycarboxylic acid molecules is facilitated due to the strong chelation of carboxyl and calcium ions on the main chain of the polycarboxylic acid water reducer, the absolute value of zeta potential on the surface of the cement particles is obviously increased, the electrostatic repulsion among the cement particles is increased, and water is released; meanwhile, the cement particles are prevented from approaching by the steric hindrance effect generated by the long-chain polyoxyethylene ether side chain and the long-chain phenyl side chain, the effect of accelerating the dispersion of the cement is achieved, the compressive strength of the concrete is improved, and the strength loss in the long-term use process is avoided.
Furthermore, the solubility of the ammonium persulfate aqueous solution is 8-12 wt%, the concentration of the 3-phenyl acrylic acid aqueous solution is 30-40 wt%, the dosage of the ammonium persulfate is 0.8-1.5% of the weight of the methallyl polyoxyethylene ether, the dosage of the sodium methallyl sulfonate is 0.3-0.5% of the weight of the methallyl polyoxyethylene ether, and the dosage of the 3-phenyl acrylic acid is 3-5 times of the weight of the methallyl polyoxyethylene ether.
The invention also provides a preparation process of the durable and stable steel slag cement concrete, which comprises the following steps: adding Portland cement into a stirrer according to parts by weight, adding 70-80 wt% of water, stirring at the rotating speed of 100-300 rpm for 20-30 min, adding medium sand and gravel, and uniformly stirring to obtain a mixture A; uniformly mixing the residual 20-30 wt% of water with a polycarboxylic acid water reducing agent and the modified converter steel slag powder to obtain a mixture B; and uniformly mixing the mixture A and the mixture B, pouring, and naturally coagulating to obtain the steel slag cement concrete.
The invention has the following beneficial effects:
1. according to the steel slag cement concrete, a macromolecular reticular structure with good hydrophilicity and coagulation effect permeates into a steel slag powder mixed material, so that the hydrophilicity of the steel slag cement concrete is improved, coagulation is promoted, the hydration degree is accelerated, free calcium oxide and magnesium oxide are further crushed and pulverized after stirring and grinding, and the volume expansion stress is eliminated; the modified converter steel slag powder reduces the production cost, meets the gel effect, and simultaneously meets the requirements on compressive strength, durability, frost resistance and impermeability.
2. According to the polycarboxylic acid water reducing agent, the cement particles are prevented from approaching by virtue of the steric hindrance effect generated by the long-chain polyoxyethylene ether side chain and the long-chain phenyl side chain, so that the effect of accelerating the dispersion of cement is achieved, the compressive strength of concrete is improved, and the strength loss in the long-term use process is avoided.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a steel slag cement concrete with durability and stability, which is prepared from the following components in parts by weight: 42kg of Portland cement, 53kg of modified converter steel slag powder, 58kg of medium sand, 75kg of gravel, 2.3kg of polycarboxylic acid water reducing agent and 45kg of water.
The preparation method of the modified converter steel slag powder comprises the following steps:
1) Adding 38kg of polyacrylamide resin and 22kg of hydroxyl acrylic resin into deionized water, heating to 55 ℃, dropwise adding 95g of initiator benzoyl peroxide, keeping the temperature and stirring for 2.6 hours after dropwise adding to obtain a mixed solution, decompressing and dewatering the mixed solution, and drying at 56 ℃ to obtain an expansion modifier; wherein, the polyacrylamide resin is white powder with the molecular weight of 1200-1500 ten thousand, the ionicity is less than 3 percent, and the residual monomer is less than or equal to 0.05 percent; the viscosity of the hydroxy acrylic resin is 60-100S, the solid content is 70 +/-2 percent, and the hydroxyl value is 100-120.
2) Placing the converter steel slag powder into a closed stirrer, heating to 685 ℃, adding diatomite and fly ash, stirring uniformly, naturally cooling to room temperature, crushing, and sieving with a 20-30-mesh sieve to obtain a steel slag powder mixed material; wherein the weight ratio of the steel slag powder to the diatomite to the fly ash is 25:4.5:1.
3) Heating the mixed material of the steel slag powder to 76 ℃, spraying water, then carrying out hot braising treatment, and continuously spraying water to keep the pressure in the closed stirrer between 0.45 MPa; adding an expansion modifier accounting for 1.6 percent of the weight of the mixed material of the steel slag powder, stirring and grinding the mixture until the grain diameter is less than 100 mu m to obtain the modified converter steel slag powder.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
adding 10kg of methyl allyl polyoxyethylene ether and 45g of sodium methallyl sulfonate into a reaction kettle equipped with a mechanical stirring dropping funnel, heating the water bath to 86 ℃, stirring until the system is clear, respectively dropwise adding 12g of 10wt% ammonium persulfate aqueous solution and 36kg of 35wt% 3-phenyl acrylic acid aqueous solution containing 3-phenyl acrylic acid into the dropping funnel, keeping the ammonium persulfate aqueous solution and the 3-phenyl acrylic acid aqueous solution dropwise adding within 1.8 hours, keeping the temperature for 2.2 hours after dropwise adding, cooling the reactant to 36 ℃, neutralizing with 35wt% sodium hydroxide solution, adjusting the pH value to 7.2, and adding a proper amount of deionized water to obtain the polycarboxylic acid water reducer with 43% of solid content.
The preparation process of the steel slag cement concrete with durability and stability of the embodiment comprises the following steps: adding portland cement into a stirrer, adding 75wt% of water, stirring for 26min, adding medium sand and gravel, and uniformly stirring to obtain a mixture A; uniformly mixing the residual 25wt% of water with a polycarboxylic acid water reducing agent and the modified converter steel slag powder to obtain a mixture B; and uniformly mixing the mixture A and the mixture B, pouring, and naturally coagulating to obtain the steel slag cement concrete.
Example 2
The embodiment provides a steel slag cement concrete with durability and stability, which is prepared from the following components in parts by weight: 47kg of portland cement, 49kg of modified converter steel slag powder, 63kg of medium sand, 75kg of gravel, 2.6kg of polycarboxylic acid water reducing agent and 52kg of water.
The preparation method of the modified converter steel slag powder comprises the following steps:
1) Adding 43kg of polyacrylamide resin and 20kg of hydroxyl acrylic resin into deionized water, heating to 60 ℃, dropwise adding 154.8g of initiator benzoyl peroxide, keeping the temperature and stirring for 2.8 hours after dropwise adding to obtain a mixed solution, performing reduced pressure dehydration on the mixed solution, and drying at 56 ℃ to obtain an expansion modifier; wherein, the polyacrylamide resin is white powder with the molecular weight of 1200-1500 ten thousand, the ionicity is less than 3 percent, and the residual monomer is less than or equal to 0.05 percent; the viscosity of the hydroxy acrylic resin is 60-100S, the solid content is 70 +/-2 percent, and the hydroxyl value is 100-120.
2) Placing the converter steel slag powder into a closed stirrer, heating to 690 ℃, adding diatomite and fly ash, stirring uniformly, naturally cooling to room temperature, crushing, and sieving with a 20-30-mesh sieve to obtain a steel slag powder mixed material; wherein the weight ratio of the steel slag powder to the diatomite to the fly ash is 26:4.5:1.
3) Heating the mixed material of the steel slag powder to 82 ℃, spraying water, then carrying out hot braising treatment, and continuously spraying water to keep the pressure in the closed stirrer between 0.45 MPa; adding an expansion modifier accounting for 2.2 percent of the weight of the mixed material of the steel slag powder, stirring and grinding the mixture until the grain diameter is less than 100 mu m to obtain the modified converter steel slag powder.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
adding 10kg of methyl allyl polyoxyethylene ether and 46g of sodium methallyl sulfonate into a reaction kettle provided with a mechanical stirring dropping funnel, heating the water bath to 87 ℃, stirring until the system is clear, respectively dropwise adding a 9wt% ammonium persulfate aqueous solution containing 13g of ammonium persulfate and a 35wt% 3-phenyl acrylic acid aqueous solution containing 36kg of 3-phenyl acrylic acid into the dropping funnel, keeping the ammonium persulfate aqueous solution and the 3-phenyl acrylic acid aqueous solution dropwise adding within 1.6 hours, keeping the temperature for reacting for 2.8 hours after dropwise adding, cooling the reactant to 38 ℃, neutralizing by using a 35wt% sodium hydroxide solution, adjusting the pH value to 7.5, and adding a proper amount of deionized water to obtain the polycarboxylic acid water reducer with the solid content of 43%.
The preparation process of the steel slag cement concrete with durability and stability of the embodiment comprises the following steps: adding Portland cement into a stirrer, adding 78wt% of water, stirring at the rotating speed of 160rpm for 28min, adding medium sand and gravel, and uniformly stirring to obtain a mixture A; uniformly mixing the rest 22wt% of water with a polycarboxylic acid water reducing agent and the modified converter steel slag powder to obtain a mixture B; and uniformly mixing the mixture A and the mixture B, pouring, and naturally coagulating to obtain the steel slag cement concrete.
Example 3
The embodiment provides a steel slag cement concrete with durability and stability, which is prepared from the following components in parts by weight: 48kg of Portland cement, 56kg of modified converter steel slag powder, 65kg of medium sand, 74kg of gravel, 2.6kg of polycarboxylic acid water reducing agent and 47kg of water.
The preparation method of the modified converter steel slag powder comprises the following steps:
1) Adding 40kg of polyacrylamide resin and 25kg of hydroxy acrylic resin into deionized water, heating to 58 ℃, dropwise adding 208g of initiator benzoyl peroxide, keeping the temperature and stirring for 2.5 hours after the dropwise adding is finished to obtain a mixed solution, decompressing and dewatering the mixed solution, and drying at 57 ℃ to obtain an expansion modifier; wherein, the polyacrylamide resin is white powder with the molecular weight of 1200-1500 ten thousand, the ionicity is less than 3 percent, and the residual monomer is less than or equal to 0.05 percent; the viscosity of the hydroxy acrylic resin is 60-100S, the solid content is 70 +/-2 percent, and the hydroxyl value is 100-120.
2) Placing the converter steel slag powder into a closed stirrer, heating to 710 ℃, adding diatomite and fly ash, stirring uniformly, naturally cooling to room temperature, crushing, and sieving by a 20-30-mesh sieve to obtain a steel slag powder mixed material; wherein the weight ratio of the steel slag powder to the diatomite to the fly ash is 25:5.2:1.
3) Heating the mixed material of the steel slag powder to 83 ℃, spraying water, then carrying out hot braising treatment, and continuously spraying water to keep the pressure in the closed stirrer between 0.36 MPa; adding an expansion modifier accounting for 1.8 percent of the weight of the mixed material of the steel slag powder, stirring and grinding the mixture until the grain diameter is less than 100 mu m to obtain the modified converter steel slag powder.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
adding 10kg of methyl allyl polyoxyethylene ether and 37g of sodium methallyl sulfonate into a reaction kettle provided with a mechanical stirring dropping funnel, heating the water bath to 87 ℃, stirring until the system is clear, respectively dropwise adding 11wt% of ammonium persulfate aqueous solution containing 13g of ammonium persulfate and 36wt% of 3-phenyl acrylic acid aqueous solution containing 37kg of 3-phenyl acrylic acid into the dropping funnel, keeping the ammonium persulfate aqueous solution and the 3-phenyl acrylic acid aqueous solution to be completely dropwise added within 2 hours, keeping the temperature for reacting for 2.8 hours after dropwise adding is completed, cooling the reactant to 37 ℃, neutralizing by using 36wt% of sodium hydroxide solution, adjusting the pH value to 6.8, and adding a proper amount of deionized water to obtain the polycarboxylic acid water reducer with the solid content of 45%.
The preparation process of the steel slag cement concrete with durability and stability of the embodiment comprises the following steps: adding Portland cement into a stirrer, adding 72wt% of water, stirring at the rotating speed of 200rpm for 30min, adding medium sand and gravel, and uniformly stirring to obtain a mixture A; uniformly mixing the residual 28wt% of water with a polycarboxylic acid water reducing agent and the modified converter steel slag powder to obtain a mixture B; and uniformly mixing the mixture A and the mixture B, pouring, and naturally coagulating to obtain the steel slag cement concrete.
Example 4
The embodiment provides a steel slag cement concrete with durability and stability, which is prepared from the following components in parts by weight: 46kg of Portland cement, 48kg of modified converter steel slag powder, 65kg of medium sand, 75kg of gravel, 2.8kg of polycarboxylic acid water reducing agent and 36kg of water.
The preparation method of the modified converter steel slag powder comprises the following steps:
1) Adding 33kg of polyacrylamide resin and 19kg of hydroxyl acrylic resin into deionized water, heating to 55 ℃, dropwise adding 155g of initiator benzoyl peroxide, keeping the temperature and stirring for 2.3 hours after dropwise adding to obtain a mixed solution, decompressing and dewatering the mixed solution, and drying at 56 ℃ to obtain an expansion modifier; wherein, the polyacrylamide resin is white powder with the molecular weight of 1200-1500 ten thousand, the ionicity is less than 3 percent, and the residual monomer is less than or equal to 0.05 percent; the viscosity of the hydroxy acrylic resin is 60-100S, the solid content is 70 +/-2 percent, and the hydroxyl value is 100-120.
2) Placing the converter steel slag powder into a closed stirrer, heating to 695 ℃, adding diatomite and fly ash, stirring uniformly, naturally cooling to room temperature, crushing, and sieving with a 20-30-mesh sieve to obtain a steel slag powder mixed material; wherein the weight ratio of the steel slag powder to the diatomite and the fly ash is 27:4.6:1.
3) Heating the mixed material of the steel slag powder to 83 ℃, spraying water, then carrying out hot braising treatment, and continuously spraying water to keep the pressure in the closed stirrer between 0.37 MPa; adding an expansion modifier accounting for 2.5 percent of the weight of the mixed material of the steel slag powder, stirring and grinding the mixture until the grain diameter is less than 100 mu m to obtain the modified converter steel slag powder.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
adding 10kg of methyl allyl polyoxyethylene ether and 37g of sodium methallyl sulfonate into a reaction kettle equipped with a mechanical stirring and dropping funnel, heating the water bath to 90 ℃, stirring until the system is clear, respectively dropwise adding a 12wt% ammonium persulfate aqueous solution containing 10g of ammonium persulfate and a 38wt% 3-phenylacrylic acid aqueous solution containing 45kg of 3-phenylacrylic acid by using the dropping funnel, keeping the ammonium persulfate aqueous solution and the 3-phenylacrylic acid aqueous solution dropwise added within 2 hours, keeping the temperature for 2.8 hours after the dropwise addition is finished, cooling the reactant to 40 ℃, neutralizing by using a 36wt% sodium hydroxide solution, adjusting the pH value to 7.6, and adding a proper amount of deionized water to obtain the polycarboxylic acid water reducer with the solid content of 45%.
The preparation process of the steel slag cement concrete with durability and stability of the embodiment comprises the following steps: adding silicate cement into a stirrer, adding 76wt% of water, stirring for 28min at the rotating speed of 260rpm, adding medium sand and gravel, and stirring uniformly to obtain a mixture A; uniformly mixing the residual 24wt% of water with a polycarboxylic acid water reducing agent and the modified converter steel slag powder to obtain a mixture B; and uniformly mixing the mixture A and the mixture B, pouring, and naturally coagulating to obtain the steel slag cement concrete.
Example 5
The embodiment provides a steel slag cement concrete with durability and stability, which is prepared from the following components in parts by weight: 50kg of Portland cement, 60kg of modified converter steel slag powder, 73kg of medium sand, 80kg of gravel, 2.9kg of polycarboxylic acid water reducing agent and 56kg of water.
The preparation method of the modified converter steel slag powder comprises the following steps:
1) Adding 47kg of polyacrylamide resin and 25kg of hydroxy acrylic resin into deionized water, heating to 62 ℃, dropwise adding 267.9g of initiator benzoyl peroxide, keeping the temperature and stirring for 2.8 hours after dropwise adding to obtain a mixed solution, decompressing and dewatering the mixed solution, and drying at 58 ℃ to obtain an expansion modifier; wherein, the polyacrylamide resin is white powder with the molecular weight of 1200-1500 ten thousand, the ionicity is less than 3 percent, and the residual monomer is less than or equal to 0.05 percent; the viscosity of the hydroxy acrylic resin is 60-100S, the solid content is 70 +/-2 percent, and the hydroxyl value is 100-120.
2) Placing the converter steel slag powder into a closed stirrer, heating to 712 ℃, adding diatomite and fly ash, stirring uniformly, naturally cooling to room temperature, crushing, and sieving by a 20-30-mesh sieve to obtain a steel slag powder mixed material; wherein the weight ratio of the steel slag powder to the diatomite to the fly ash is 27:5.2:1.
3) Heating the mixed material of the steel slag powder to 82 ℃, spraying water, then carrying out hot braising treatment, and continuously spraying water to keep the pressure in the closed stirrer between 0.45 MPa; adding an expansion modifier accounting for 2.5 percent of the weight of the mixed material of the steel slag powder, stirring and grinding the mixture until the particle size is less than 100 mu m to obtain the modified converter steel slag powder.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
adding 10kg of methyl allyl polyoxyethylene ether and 48g of sodium methallyl sulfonate into a reaction kettle provided with a mechanical stirring dropping funnel, heating the water bath to 90 ℃, stirring until the system is clear, respectively dropwise adding a 12wt% ammonium persulfate aqueous solution containing 14.6g of ammonium persulfate and a 40wt% 3-phenyl acrylic acid aqueous solution containing 42kg of 3-phenyl acrylic acid into the dropping funnel, keeping the ammonium persulfate aqueous solution and the 3-phenyl acrylic acid aqueous solution dropwise added within 2 hours, keeping the temperature for reacting for 3 hours after the dropwise adding is finished, cooling the reactant to 38 ℃, neutralizing by using a 32wt% sodium hydroxide solution, adjusting the pH value to 8, and adding a proper amount of deionized water to obtain the polycarboxylic acid water reducer with the solid content of 43%.
The preparation process of the steel slag cement concrete with durability and stability of the embodiment comprises the following steps: adding Portland cement into a stirrer, adding 80wt% of water, stirring at the rotating speed of 280rpm for 30min, adding medium sand and gravel, and uniformly stirring to obtain a mixture A; uniformly mixing the residual 20wt% of water with a polycarboxylic acid water reducing agent and the modified converter steel slag powder to obtain a mixture B; and uniformly mixing the mixture A and the mixture B, pouring, and naturally coagulating to obtain the steel slag cement concrete.
Comparative example 1
The comparative example differs from example 1 in that the modified converter slag powder is replaced by converter slag powder having a particle size of less than 100 μm.
Comparative example 2
The comparative example differs from example 1 in that the polycarboxylate water reducer is selected from the commercially available polycarboxylate water reducers of type ZY 8020.
Comparative example 3
This comparative example differs from example 1 in that the portland cement is replaced with aluminate cement.
Performance testing
According to GB50081-2002 Standard of ordinary concrete mechanical property test method, preparing the concrete block into 150mm multiplied by 150mm, and measuring the compression strength of the concrete block after 28 days of maintenance; determining the shrinkage absolute value of the concrete test block according to GB50082-2009 Standard test method for the long-term performance and durability of ordinary concrete; the durability test adopts an electric flux method to test the coulomb of the chloride ion permeability; and (3) determining whether the frost resistance and the impermeability meet the requirements of JTS151-2011 concrete structure design specification of water transportation engineering. The specific test results are shown in the following table:
as can be seen from the above table, the compressive strength of the steel slag cement concrete prepared by the embodiment of the invention after being maintained for 28 days is more than 50MPa, and reaches the C50 grade; chloride permeability is less than the comparative example, indicating better durability; the frost resistance and the impermeability meet the standard requirements, which shows that the concrete and the modified converter slag powder prepared by the components meet the gel effect, and simultaneously, the compressive strength, the durability, the frost resistance and the impermeability are all in accordance with the requirements and are improved, so that the concrete and the modified converter slag powder are suitable for large-scale industrial application. Comparative example 1, because the converter slag is not improved, the effect that the macromolecule net structure penetrates into the slag powder mixed material, the hydrophilicity is improved and the coagulation effect is promoted cannot be achieved, the compressive strength of the concrete after coagulation is obviously reduced, the shrinkage rate is increased, the durability is deteriorated, and the freezing resistance and the impermeability are reduced to some extent.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (3)
1. The steel slag cement concrete with durability and stability is characterized by being prepared from the following components in parts by weight: 35 to 50 portions of Portland cement, 40 to 62 portions of modified converter steel slag powder, 50 to 76 portions of medium sand, 62 to 85 portions of gravel, 1.5 to 3.2 portions of polycarboxylic acid water reducing agent and 25 to 60 portions of water;
the preparation process of the modified converter steel slag powder comprises the following steps: preparing a swelling modifier from polyacrylamide resin and hydroxyl acrylic resin under the action of an initiator; heating converter steel slag powder, adding diatomite and fly ash, crushing and sieving to obtain a steel slag powder mixed material; after the steel slag powder mixed material is subjected to pressure-maintaining and heat-stewing treatment, stirring and grinding with an expansion modifier;
the polycarboxylate superplasticizer is prepared by carrying out free radical polymerization reaction on methyl allyl polyoxyethylene ether and a 3-phenyl acrylic monomer under the conditions of a chain transfer agent sodium methallyl sulfonate and an initiator sodium persulfate, and adjusting the pH value and the solid content;
the preparation method of the modified converter steel slag powder comprises the following steps:
1) Adding 25-50 parts by weight of polyacrylamide resin and 12-30 parts by weight of hydroxyl acrylic resin into deionized water, heating to 45-65 ℃, dropwise adding an initiator benzoyl peroxide, keeping the temperature and stirring for 2-3 hours after dropwise adding to obtain a mixed solution, decompressing and dewatering the mixed solution, and drying at 50-60 ℃ to obtain an expansion modifier;
2) Placing the converter steel slag powder into a closed stirrer, heating to 650-720 ℃, adding diatomite and fly ash, stirring uniformly, naturally cooling to room temperature, crushing, and sieving with a 20-30-mesh sieve to obtain a steel slag powder mixed material;
3) Heating the mixed material of the steel slag powder to 70-85 ℃, spraying water, then carrying out thermal braising treatment, and continuously spraying water to keep the pressure in the closed stirrer between 0.3-0.5 MPa; adding an expansion modifier accounting for 1-3% of the weight of the mixed material of the steel slag powder, stirring and grinding the mixture until the particle size is less than 100 mu m to obtain modified converter steel slag powder;
the preparation method of the polycarboxylate superplasticizer comprises the following steps:
adding methyl allyl polyoxyethylene ether and sodium methallyl sulfonate into a reaction kettle provided with a mechanical stirring dropping funnel, heating the water bath to 80-90 ℃, stirring until the system is clear, respectively dropping an ammonium persulfate aqueous solution and a 3-phenyl acrylic acid aqueous solution into the dropping funnel, keeping the ammonium persulfate aqueous solution and the 3-phenyl acrylic acid aqueous solution dropping within 1-2 hours, keeping the temperature for 2-3 hours after the dropping is finished, cooling the reactant to 30-40 ℃, neutralizing the reactant by using 30-40 wt% of sodium hydroxide solution, adjusting the pH value to 6-8, and adding a proper amount of deionized water to obtain a polycarboxylic acid water reducer with the solid content of 40-45%;
the solubility of the ammonium persulfate aqueous solution is 8-12 wt%, the concentration of the 3-phenyl acrylic acid aqueous solution is 30-40 wt%, the dosage of the ammonium persulfate is 0.8-1.5% of the weight of the methyl allyl polyoxyethylene ether, the dosage of the sodium methallyl sulfonate is 0.3-0.5% of the weight of the methyl allyl polyoxyethylene ether, and the dosage of the 3-phenyl acrylic acid is 3-5 times of the weight of the methyl allyl polyoxyethylene ether.
2. The durable and stable steel slag cement concrete as claimed in claim 1, wherein the polyacrylamide resin is white powder with a molecular weight of 1200-1500 ten thousand, an ionicity of less than 3%, and a residual monomer of less than or equal to 0.05%; the viscosity of the hydroxy acrylic resin is 60-100S, the solid content is 70 +/-2%, the hydroxyl value is 100-120, and the dosage of the initiator is 0.1-0.6% of the weight of the polyacrylamide resin.
3. The durable stable steel slag cement concrete as claimed in claim 2, wherein the weight ratio of the steel slag powder to the diatomite and the fly ash is 20-30: 3 to 6:1.
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| CN1724441A (en) * | 2005-06-23 | 2006-01-25 | 上海宝钢冶金建设公司 | Formulating weight concrete using steel dregs as aggregate |
| CN102286134A (en) * | 2011-06-09 | 2011-12-21 | 江苏天音化工有限公司 | Preparation method for high-performance water reducing agent |
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| CN1724441A (en) * | 2005-06-23 | 2006-01-25 | 上海宝钢冶金建设公司 | Formulating weight concrete using steel dregs as aggregate |
| CN102286134A (en) * | 2011-06-09 | 2011-12-21 | 江苏天音化工有限公司 | Preparation method for high-performance water reducing agent |
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