CN112939493A - Preparation process of low-cost anti-seepage sulphoaluminate cement - Google Patents
Preparation process of low-cost anti-seepage sulphoaluminate cement Download PDFInfo
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- CN112939493A CN112939493A CN202110145446.3A CN202110145446A CN112939493A CN 112939493 A CN112939493 A CN 112939493A CN 202110145446 A CN202110145446 A CN 202110145446A CN 112939493 A CN112939493 A CN 112939493A
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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
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
- C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a preparation process of low-cost anti-seepage sulphoaluminate cement, which comprises the following steps: sequentially preparing raw materials and clinker; adding starch into normal-temperature water, stirring uniformly, sequentially adding sodium carbonate and sodium hydroxide under the stirring state, raising the temperature to 70-78 ℃, stirring for 20-30min, raising the temperature to 120-; uniformly mixing clinker, pretreated chitosan fiber, gypsum, microcrystalline cellulose, ferric oxide and an early strength agent, adding a water reducing agent, calcium lignosulfonate and water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement. The invention can effectively avoid various tiny flaws in the construction process, has excellent anti-seepage effect, no toxicity and no smell, has simple construction process, can be used for manufacturing building material products such as building mortar, concrete bricks, building blocks and the like, and is very suitable for ocean engineering construction.
Description
Technical Field
The invention relates to the technical field of sulphoaluminate cement, in particular to a preparation process of low-cost impervious sulphoaluminate cement.
Background
The cement column is also called as concrete column, is formed by pouring reinforcing steel bars and concrete, has good durability, cheap and easily available raw materials, large compressive strength and diversified shapes, and is widely applied to the field of buildings, such as ocean engineering. However, the factors of humidity, temperature, salinity, etc. in ocean engineering are different from those in land engineering, and are more severe than those in the latter.
In the 70 s of the twentieth century, sulphoaluminate cement was invented in China, and at present, aluminate cement series products are generally called second series cement, and the mineral composition characteristics of the series cement are that the series cement contains a large amount of C4A3 minerals. Sulphoaluminate cement is independently researched by China building material science research institute, the yield of sulphoaluminate cement in China rises year by year, the yield of sulphoaluminate cement in China is ten million tons at present, and sulphoaluminate cement columns are widely applied to rush repair and rush construction projects, prefabricated parts, GRC products and low-temperature construction projects, particularly seawater corrosion resistance projects.
The sulphoaluminate cement column prepared in the prior art has poor impermeability, and can crack or even collapse under the action of water pressure for a long time. Meanwhile, seawater contains a large amount of chloride ions and sulfate ions, so that the corrosion effect on steel bars and mortar is easily generated, a passive film on the surfaces of the steel bars is damaged, the corrosion and expansion of the steel bars are caused, further, the cracking and water seepage phenomena of cement columns are serious, and the practicability of ocean engineering buildings is very influenced.
At present, the problems of easy cracking and short service life of marine engineering in China generally exist, which seriously restrict the development of marine resources, the development of marine economy and marine strategy in China and urgently need to be solved.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a preparation process of low-cost impervious sulphoaluminate cement.
The invention provides a preparation process of low-cost anti-seepage sulphoaluminate cement, which comprises the following steps:
s1, mixing 50-80 parts of limestone, 15-25 parts of bauxite, 5-20 parts of converter slag, 1-4 parts of fly ash and 10-20 parts of desulfurized gypsum according to parts by weight, feeding the mixture into a grinder for grinding, adding water until the mixture is held by a hand to be agglomerated, and slightly pressing the agglomerated mixture to obtain a raw material;
s2, heating the furnace temperature of the heating furnace to 400-600 ℃, placing the raw materials in the heating furnace, continuously heating to 800-1000 ℃ along with the heating furnace, preserving the heat for 1-2h, and performing water extraction and quenching to obtain clinker;
s3, adding 5-15 parts of starch into 50-100 parts of normal-temperature water, uniformly stirring, sequentially adding 1-2 parts of sodium carbonate and 0.1-2 parts of sodium hydroxide under the stirring state, raising the temperature to 70-78 ℃, stirring for 20-30min at the stirring speed of 300r/min, raising the temperature to 120-130 ℃, adding 20-40 parts of chitosan fiber and 1-2 parts of sodium trimetaphosphate, stirring for 5-15min, and performing vacuum defoaming to obtain pretreated chitosan fiber;
s4, uniformly mixing clinker, pretreated chitosan fiber, 1-5 parts of gypsum, 1-5 parts of microcrystalline cellulose, 1-5 parts of ferric oxide and 1-2 parts of early strength agent, adding 0.2-1 part of water reducing agent, 1-2 parts of calcium lignosulfonate and 20-40 parts of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
Preferably, in S1, the converter slag comprises, in weight percent: CaO 28-31%, SiO2 31-34％，Al2O3 8-10％，MgO 2-6％，TiO24-6% and the balance of other impurities.
Preferably, in S1, the fly ash comprises, in weight percent: SiO22 55-59％，Al2O3 20-23％，Fe2O38-9 percent of CaO, 1-2 percent of CaO and the balance of other impurities.
Preferably, in S1, the mixture is fed into a grinder and ground to a particle size of 100-500 μm.
Preferably, in S2, the temperature rising speed is 2-6 ℃/min in the process of continuing rising the temperature to 800-.
Preferably, in S2, the water extraction quenching is performed in a flowing water stream at a temperature of 5-15 ℃.
Preferably, in S4, the water reducing agent is a polycarboxylic acid high efficiency water reducing agent.
Preferably, in S4, the early strength agent is prepared from aluminum sulfate and calcium fluoride in a weight ratio of 1-2: 1-2.
The technical effects of the invention are as follows:
according to the invention, the starch is stirred at a low temperature and then at a high temperature, the hydrogen bonds between the disordered and ordered molecules can be sequentially broken, the starch is fully swelled and broken and fully coated on the surface of the chitosan fiber, and crosslinking is carried out under the action of sodium trimetaphosphate, so that the product has high stability and excellent elasticity; the pretreated chitosan fiber has excellent dispersibility in a system, can fill gaps among aggregates, and can promote microcrystalline cellulose to permeate in the system and further enter pores and cracks inside the aggregates, so that the porosity of cement is reduced, the structural strength of the aggregates is enhanced, the impermeability is enhanced, and the mechanical performance of recycled concrete can be enhanced.
The invention effectively utilizes the converter slag and the fly ash, changes waste into valuable, realizes resource recycling, can effectively avoid various tiny flaws in the construction process, has the characteristics of high temperature resistance, no toxicity and no odor, has excellent anti-seepage effect, is simple in construction process, can be used for manufacturing building materials such as building mortar, concrete bricks and building blocks, and is very suitable for ocean engineering construction.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 50kg of limestone, 15kg of bauxite, 5kg of converter slag, 1kg of fly ash and 16kg of desulfurized gypsum, feeding the mixture into a grinder, crushing the mixture to the particle size of 100-;
the converter slag comprises the following components in percentage by weight: CaO 28%, SiO2 31％，Al2O3 8％，MgO 2％，TiO24 percent, and the balance being other impurities;
the fly ash comprises the following components in percentage by weight: SiO22 55％，Al2O3 20％，Fe2O38 percent of CaO, 1 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 400 ℃, placing the raw material in the heating furnace, continuously heating to 800 ℃ along with the heating furnace, keeping the temperature at 2 ℃/min for 1h, and carrying out water extraction quenching in flowing water at the temperature of 5 ℃ to obtain clinker;
s3, adding 5kg of starch into 50kg of normal-temperature water, uniformly stirring, sequentially adding 1kg of sodium carbonate and 0.1kg of sodium hydroxide under the stirring state, raising the temperature to 70 ℃, stirring for 20min at the stirring speed of 200r/min, raising the temperature to 120 ℃, adding 20kg of chitosan fiber and 1kg of sodium trimetaphosphate, stirring for 5min, and carrying out vacuum defoaming to obtain pretreated chitosan fiber;
s4, uniformly mixing clinker, pretreated chitosan fiber, 1kg of gypsum, 1kg of microcrystalline cellulose, 1kg of ferric oxide, 0.5kg of aluminum sulfate and 0.5kg of calcium fluoride, adding 0.2kg of polycarboxylic acid high-efficiency water reducing agent, 1kg of calcium lignosulfonate and 20kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
Example 2
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 80kg of limestone, 25kg of bauxite, 20kg of converter slag, 4kg of fly ash and 20kg of desulfurized gypsum, feeding the mixture into a grinder, crushing the mixture to the particle size of 100-500 mu m, adding water into the mixture until the mixture is held by a hand to be agglomerated, and slightly pressing the agglomerated mixture to obtain a raw material;
the converter slag comprises the following components in percentage by weight: CaO 31%, SiO2 34％，Al2O3 10％，MgO 6％， TiO26 percent, and the balance of other impurities;
the fly ash comprises the following components in percentage by weight: SiO22 59％，Al2O3 23％，Fe2O38 percent of CaO, 2 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 600 ℃, placing the raw material in the heating furnace, continuously heating to 1000 ℃ along with the heating furnace, keeping the temperature at 6 ℃/min for 2h, and carrying out water extraction quenching in flowing water at the temperature of 15 ℃ to obtain clinker;
s3, adding 15kg of starch into 100kg of normal-temperature water, uniformly stirring, sequentially adding 2kg of sodium carbonate and 2kg of sodium hydroxide under a stirring state, raising the temperature to 78 ℃, stirring for 30min at a stirring speed of 300r/min, raising the temperature to 130 ℃, adding 40kg of chitosan fiber and 2kg of sodium trimetaphosphate, stirring for 15min, and performing vacuum defoaming to obtain pretreated chitosan fiber;
s4, uniformly mixing clinker, pretreated chitosan fiber, 5kg of gypsum, 5kg of microcrystalline cellulose, 5kg of ferric oxide, 1kg of aluminum sulfate and 1kg of calcium fluoride, adding 1kg of polycarboxylic acid high-efficiency water reducing agent, 2kg of calcium lignosulfonate and 40kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
Example 3
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 70kg of limestone, 18kg of bauxite, 10kg of converter slag, 2kg of fly ash and 10kg of desulfurized gypsum, feeding the mixture into a grinder, crushing the mixture to the particle size of 100-500 mu m, adding water into the mixture until the mixture is held by a hand to be agglomerated, and slightly pressing the agglomerated mixture to obtain a raw material;
the converter slag comprises the following components in percentage by weight: CaO 29%, SiO2 32％，Al2O3 8.2％，MgO 2.5％， TiO24.5 percent, and the balance being other impurities;
the fly ash comprises the following components in percentage by weight: SiO 256%, Al2O3 21％，Fe2O31.5 percent of CaO, 1.2 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 420 ℃, placing the raw material in the heating furnace, continuously heating to 850 ℃ along with the heating furnace, keeping the temperature at 3 ℃/min for 1.2h, and carrying out water extraction and quenching in flowing water flow at the temperature of 6 ℃ to obtain clinker;
s3, adding 8kg of starch into 60kg of normal-temperature water, uniformly stirring, sequentially adding 1.2kg of sodium carbonate and 0.2kg of sodium hydroxide under the stirring state, raising the temperature to 7 ℃, stirring for 21min at the stirring speed of 220r/min, raising the temperature to 122 ℃, adding 24kg of chitosan fiber and 1.2kg of sodium trimetaphosphate, stirring for 6min, and carrying out vacuum defoaming to obtain pretreated chitosan fiber;
s4, uniformly mixing clinker, pretreated chitosan fiber, 2kg of gypsum, 2kg of microcrystalline cellulose, 2kg of ferric oxide and 1.2kg of early strength agent, adding 0.4kg of polycarboxylic acid high-efficiency water reducing agent, 1.2kg of calcium lignosulfonate and 25kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement; the early strength agent is prepared from aluminum sulfate and calcium fluoride according to the weight ratio of 1: 1.2.
Example 4
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 75kg of limestone, 22kg of bauxite, 18kg of converter slag, 3kg of fly ash and 12kg of desulfurized gypsum, feeding the mixture into a grinder, grinding the mixture to a particle size of 100-500 mu m, adding water into the mixture until the mixture is held by a hand to form a cluster, and lightly pressing the cluster to obtain a raw material;
the converter slag comprises the following components in percentage by weight: CaO 30%, SiO2 32％，Al2O3 9％，MgO 4％，TiO25 percent, and the balance being other impurities;
the fly ash comprises the following components in percentage by weight: SiO22 58％，Al2O3 22％，Fe2O38 percent of CaO, 1 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 520 ℃, placing the raw material in the heating furnace, continuously heating the raw material to 900 ℃ along with the heating furnace, keeping the temperature at 5 ℃/min, keeping the temperature for 1.6h, and carrying out water extraction and quenching in flowing water flow at the temperature of 12 ℃ to obtain clinker;
s3, adding 12kg of starch into 90kg of normal-temperature water, uniformly stirring, sequentially adding 1.8kg of sodium carbonate and 1.8kg of sodium hydroxide under the stirring state, raising the temperature to 76 ℃, stirring for 26min at the stirring speed of 280r/min, raising the temperature to 128 ℃, adding 35kg of chitosan fiber and 1.8kg of sodium trimetaphosphate, stirring for 12min, and carrying out vacuum defoaming to obtain pretreated chitosan fiber;
s4, uniformly mixing clinker, pretreated chitosan fiber, 4kg of gypsum, 4kg of microcrystalline cellulose, 4kg of ferric oxide and 1.8kg of early strength agent, adding 0.8kg of polycarboxylic acid high-efficiency water reducing agent, 1.8kg of calcium lignosulfonate and 36kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement; the early strength agent is prepared from aluminum sulfate and calcium fluoride according to the weight ratio of 1.5: 1.5.
Example 5
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 70kg of limestone, 20kg of bauxite, 12kg of converter slag, 2kg of fly ash and 16kg of desulfurized gypsum, feeding the mixture into a grinder, grinding the mixture to a particle size of 100-500 mu m, adding water into the mixture until the mixture is held by a hand to form a cluster, and lightly pressing the cluster to obtain a raw material;
the converter slag comprises the following components in percentage by weight: CaO 30%, SiO2 32％，Al2O3 9％，MgO 4％，TiO25 percent, and the balance being other impurities;
the fly ash comprises the following components in percentage by weight: SiO22 56％，Al2O3 22％，Fe2O38.5 percent of CaO, 1.5 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 500 ℃, placing the raw material in the heating furnace, continuously heating to 920 ℃ along with the heating furnace, keeping the temperature at 5 ℃/min, keeping the temperature for 1.5h, and carrying out water extraction and quenching in flowing water at the temperature of 12 ℃ to obtain clinker;
s3, adding 10kg of starch into 80kg of normal-temperature water, uniformly stirring, sequentially adding 1.4kg of sodium carbonate and 1.5kg of sodium hydroxide under the stirring state, raising the temperature to 75 ℃, stirring for 25min at the stirring speed of 250r/min, raising the temperature to 125 ℃, adding 30kg of chitosan fiber and 1.5kg of sodium trimetaphosphate, stirring for 12min, and carrying out vacuum defoaming to obtain pretreated chitosan fiber;
s4, uniformly mixing clinker, pretreated chitosan fiber, 4kg of gypsum, 3kg of microcrystalline cellulose, 3kg of ferric oxide, 0.75kg of aluminum sulfate and 0.75kg of calcium fluoride, adding 0.6kg of polycarboxylic acid high-efficiency water reducing agent, 1.6kg of calcium lignosulfonate and 32kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
Comparative example 1
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 70kg of limestone, 20kg of bauxite, 12kg of converter slag, 2kg of fly ash and 16kg of desulfurized gypsum, feeding the mixture into a grinder, grinding the mixture to a particle size of 100-500 mu m, adding water into the mixture until the mixture is held by a hand to form a cluster, and lightly pressing the cluster to obtain a raw material;
the converter slag comprises the following components in percentage by weight: CaO 30%, SiO2 32％，Al2O3 9％，MgO 4％，TiO25 percent, and the balance being other impurities;
the fly ash comprises the following components in percentage by weight: SiO22 56％，Al2O3 22％，Fe2O38.5 percent of CaO, 1.5 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 500 ℃, placing the raw material in the heating furnace, continuously heating to 920 ℃ along with the heating furnace, keeping the temperature at 5 ℃/min, keeping the temperature for 1.5h, and carrying out water extraction and quenching in flowing water at the temperature of 12 ℃ to obtain clinker;
s3, uniformly mixing clinker, 4kg of gypsum, 3kg of microcrystalline cellulose, 3kg of ferric oxide, 0.75kg of aluminum sulfate and 0.75kg of calcium fluoride, adding 0.6kg of polycarboxylic acid high-efficiency water reducing agent, 1.6kg of calcium lignosulfonate and 32kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
Comparative example 2
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 70kg of limestone, 20kg of bauxite, 12kg of converter slag, 2kg of fly ash and 16kg of desulfurized gypsum, feeding the mixture into a grinder, grinding the mixture to a particle size of 100-500 mu m, adding water into the mixture until the mixture is held by a hand to form a cluster, and lightly pressing the cluster to obtain a raw material;
the converter slag comprises the following components in percentage by weight: CaO 30%, SiO2 32％，Al2O3 9％，MgO 4％，TiO25 percent, and the balance being other impurities;
the fly ash comprises the following components in percentage by weight: SiO22 56％，Al2O3 22％，Fe2O38.5 percent of CaO, 1.5 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 500 ℃, placing the raw material in the heating furnace, continuously heating to 920 ℃ along with the heating furnace, keeping the temperature at 5 ℃/min, keeping the temperature for 1.5h, and carrying out water extraction and quenching in flowing water at the temperature of 12 ℃ to obtain clinker;
s3, uniformly mixing clinker, 30kg of chitosan fiber, 4kg of gypsum, 3kg of microcrystalline cellulose, 3kg of ferric oxide, 0.75kg of aluminum sulfate and 0.75kg of calcium fluoride, adding 0.6kg of polycarboxylic acid high-efficiency water reducing agent, 1.6kg of calcium lignosulfonate and 32kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
Comparative example 3
A preparation process of low-cost anti-seepage sulphoaluminate cement comprises the following steps:
s1, mixing 70kg of limestone, 20kg of bauxite, 12kg of converter slag, 2kg of fly ash and 16kg of desulfurized gypsum, feeding the mixture into a grinder, grinding the mixture to a particle size of 100-500 mu m, adding water into the mixture until the mixture is held by a hand to form a cluster, and lightly pressing the cluster to obtain a raw material;
the converter slag comprises the following components in percentage by weight: CaO 30%, SiO2 32％，Al2O3 9％，MgO 4％，TiO25 percent, and the balance being other impurities;
the fly ash comprises the following components in percentage by weight: SiO22 56％，Al2O3 22％，Fe2O38.5 percent of CaO, 1.5 percent of CaO and the balance of other impurities;
s2, heating the furnace temperature of the heating furnace to 500 ℃, placing the raw material in the heating furnace, continuously heating to 920 ℃ along with the heating furnace, keeping the temperature at 5 ℃/min, keeping the temperature for 1.5h, and carrying out water extraction and quenching in flowing water at the temperature of 12 ℃ to obtain clinker;
s3, adding 10kg of starch into 80kg of normal-temperature water, uniformly stirring, sequentially adding 1.4kg of sodium carbonate and 1.5kg of sodium hydroxide under the stirring state, raising the temperature to 75 ℃, and stirring for 25min at the stirring speed of 250r/min to obtain pre-gelatinized starch;
s4, uniformly mixing clinker, pregelatinized starch, 4kg of gypsum, 3kg of microcrystalline cellulose, 3kg of ferric oxide, 0.75kg of aluminum sulfate and 0.75kg of calcium fluoride, adding 0.6kg of polycarboxylic acid high-efficiency water reducing agent, 1.6kg of calcium lignosulfonate and 32kg of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
The performance of the mortar is detected according to JGJ/T70-2009 Standard building mortar basic performance test method, and the detection results are shown in the following table:
| detecting items | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Consistency, mm | 80 | 65 | 72 | 68 |
| Initial setting time, min | 265 | 205 | 220 | 235 |
| Final setting time, min | 315 | 260 | 275 | 282 |
| Compressive strength of 4h, MPa | 31.5 | 25.8 | 26.2 | 28.4 |
| 4h flexural strength, MPa | 4.8 | 2.8 | 3.1 | 3.4 |
| Compressive strength of 24 hours, MPa | 42.5 | 30.2 | 31.4 | 35.8 |
| Flexural strength of 24 hours, MPa | 6.7 | 4.2 | 4.3 | 5.1 |
The low-cost impervious sulphoaluminate cement obtained by the invention is cured for 7 days after construction, and the parameters of the compressive strength and the splitting tensile strength are detected according to the national standard GB/T50081-2002.
In the detection process: putting a sample to be detected into a truncated cone test mold forming standard with a bottom metal and a detected test piece, wherein the diameter of the upper opening of the truncated cone test mold forming standard is 70mm, the diameter of the lower opening of the truncated cone test mold is 80mm, and the height of the truncated cone test mold forming standard is 30mm, covering the test piece with plastic cloth after forming and standing, putting the test piece into water at 20 ℃ after demolding and curing for 7d, taking out the test piece and sealing the test piece into a permeameter by using a sealing material for water seepage pressure detection after surface drying, and using 6 test pieces in one group.
Starting water pressure from 0.2MPa, keeping constant pressure for 2h, increasing the water pressure to 0.3MPa, increasing the water pressure to 0.1MPa every 1h, stopping the test when the surfaces of three test pieces in six test pieces have water seepage, recording the water pressure, and obtaining the detection results shown in the following table:
| test items | Water penetration pressure MPa | Compressive strength MPa | Tensile strength in cleavage MPa |
| Example 5 | 1.52 | 41.05 | 2.95 |
| Comparative example 1 | 0.85 | 21.45 | 1.85 |
| Comparative example 2 | 0.42 | 19.31 | 1.62 |
| Comparative example 3 | 0.62 | 20.42 | 1.68 |
As shown in the table, the low-cost anti-seepage sulphoaluminate cement has extremely excellent waterproof performance, high compressive strength and high splitting tensile strength, and has excellent anti-seepage performance.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A preparation process of low-cost anti-seepage sulphoaluminate cement is characterized by comprising the following steps:
s1, mixing 50-80 parts of limestone, 15-25 parts of bauxite, 5-20 parts of converter slag, 1-4 parts of fly ash and 10-20 parts of desulfurized gypsum according to parts by weight, feeding the mixture into a grinder for grinding, adding water until the mixture is held by a hand to be agglomerated, and slightly pressing the agglomerated mixture to obtain a raw material;
s2, heating the furnace temperature of the heating furnace to 400-600 ℃, placing the raw material in the heating furnace, continuously heating the raw material to 800-1000 ℃ along with the heating furnace, preserving the heat for 1-2h, and performing water extraction and quenching to obtain clinker;
s3, adding 5-15 parts of starch into 50-100 parts of normal-temperature water, uniformly stirring, sequentially adding 1-2 parts of sodium carbonate and 0.1-2 parts of sodium hydroxide under the stirring state, raising the temperature to 70-78 ℃, stirring for 20-30min at the stirring speed of 300r/min, raising the temperature to 120-130 ℃, adding 20-40 parts of chitosan fiber and 1-2 parts of sodium trimetaphosphate, stirring for 5-15min, and performing vacuum defoaming to obtain pretreated chitosan fiber;
s4, uniformly mixing clinker, pretreated chitosan fiber, 1-5 parts of gypsum, 1-5 parts of microcrystalline cellulose, 1-5 parts of ferric oxide and 1-2 parts of early strength agent, adding 0.2-1 part of water reducing agent, 1-2 parts of calcium lignosulfonate and 20-40 parts of water, and uniformly mixing to obtain the low-cost anti-seepage sulphoaluminate cement.
2. The process for the preparation of a low cost, bleed-resistant sulphoaluminate cement according to claim 1, characterised in thatIn S1, the converter slag comprises the following components in percentage by weight: CaO 28-31%, SiO2 31-34％，Al2O38-10%, MgO 2-6%, TiO 24-6%, and the balance of other impurities.
3. The process for preparing a low cost, bleed-resistant sulphoaluminate cement according to claim 1, wherein in S1 the fly ash comprises in weight percent: SiO22 55-59％，Al2O3 20-23％，Fe2O38-9 percent of CaO, 1-2 percent of CaO and the balance of other impurities.
4. The process for preparing a low-cost sulphoaluminate cement according to claim 1, wherein in S1, the cement is ground to a particle size of 100-500 μm by a grinder.
5. The process for preparing low-cost sulphoaluminate cement of anti-seepage of claim 1, wherein in S2, the temperature rise rate is 2-6 ℃/min in the process of continuing to rise to 800-1000 ℃ along with the heating furnace.
6. The process for preparing a low cost, bleed-resistant sulphoaluminate cement according to claim 1 wherein in S2, the water extraction quench is carried out in a flowing stream at a temperature of 5-15 ℃.
7. The process for preparing low-cost seepage-resistant sulphoaluminate cement according to claim 1, wherein in S4, the water reducing agent is a polycarboxylic acid high efficiency water reducing agent.
8. The process for preparing low-cost anti-bleeding sulphoaluminate cement according to claim 1, wherein in S4, the early strength agent is prepared from aluminium sulphate and calcium fluoride in a weight ratio of 1-2: 1-2.
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| CN104860556A (en) * | 2014-02-24 | 2015-08-26 | 唐山北极熊建材有限公司 | Fast-setting-and-hardening belite sulphate aluminum cement clinker, applications and production technology |
| CN108147687A (en) * | 2017-12-27 | 2018-06-12 | 成都锦汇科技有限公司 | A kind of preparation method of sulphate aluminium cement |
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| CN110713369A (en) * | 2019-11-05 | 2020-01-21 | 苏州金螳螂文化发展股份有限公司 | Sculpture cement and preparation method thereof |
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| JPH07237950A (en) * | 1994-02-23 | 1995-09-12 | Denki Kagaku Kogyo Kk | Cement admixture for grout and cement composition |
| CN104860556A (en) * | 2014-02-24 | 2015-08-26 | 唐山北极熊建材有限公司 | Fast-setting-and-hardening belite sulphate aluminum cement clinker, applications and production technology |
| CN108147687A (en) * | 2017-12-27 | 2018-06-12 | 成都锦汇科技有限公司 | A kind of preparation method of sulphate aluminium cement |
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