CN110776297A - Sulphoaluminate cement-based concrete and preparation process thereof - Google Patents
Sulphoaluminate cement-based concrete and preparation process thereof Download PDFInfo
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- CN110776297A CN110776297A CN201911030283.3A CN201911030283A CN110776297A CN 110776297 A CN110776297 A CN 110776297A CN 201911030283 A CN201911030283 A CN 201911030283A CN 110776297 A CN110776297 A CN 110776297A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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Abstract
The invention discloses sulphoaluminate cement-based concrete and a preparation process thereof, wherein the sulphoaluminate cement-based concrete comprises the following raw materials in parts by weight: 14.076-16.565% of sulphoaluminate cement, 0.828-2.484% of industrial by-product gypsum, 24% of fine sand, 52% of stones, 7.44% of water and 0.014-0.017% of retarder. The method comprises the following steps: s1, weighing the raw materials in parts by weight, putting the cement and the byproduct gypsum in the raw materials into a stirrer for dry stirring, and then putting the fine sand and the stones into the stirrer for stirring for 3min to be uniform; s2, adding the weighed ascorbic acid into weighed water, and stirring to dissolve the ascorbic acid; s3, adding the solution prepared in the S2 into a stirrer, and stirring for 3min until the solution is uniform; and S4, after stirring, filling the mixture into a mold, vibrating the mixture for molding, moving the mixture into a curing box for curing, and then demolding to obtain a finished product. By using the industrial by-product gypsum to replace part of sulphoaluminate cement, controlling the use amount of the gypsum to be 0.828-2.484 percent of the total mass of the concrete, and doping a trace amount of Vc, the problem of short setting time of sulphoaluminate cement-based concrete can be solved, and the strength performance and the plasticity of the concrete can be improved.
Description
Technical Field
The invention belongs to the field of high added value treatment and utilization of industrial byproduct gypsum, and particularly relates to sulphoaluminate cement-based concrete and a preparation method thereof.
Background
The industrial by-product gypsum mainly comprises desulfurized gypsum, phosphogypsum, titanium gypsum, fluorgypsum, citric acid gypsum, boron gypsum and the like. With the yield of phosphate fertilizer, citric acid, titanium dioxide, coal and the like in China reaching the world first, the emission of industrial byproduct gypsum produced therewith also reaches the world first. The gypsum has complex components, more impurities, high treatment difficulty, land occupation by accumulation and environmental pollution. With the increase of environmental protection in China, the industrial by-product gypsum becomes an important obstacle for restricting the development of related production enterprises, and even the enterprises are in a semi-stop state because the industrial by-product gypsum cannot be treated. Therefore, the problem of reasonably and efficiently utilizing the industrial byproduct gypsum is to be solved. The application of the industrial by-product gypsum in building materials is the most potential application direction, and the industrial by-product gypsum can be consumed more rapidly, and the construction materials can be prepared, so that the cost of the building materials can be reduced, and the industrial by-product gypsum is highly concerned and expected in academia and industry. The industrial by-product gypsum is an industrial by-product with calcium sulfate as a main component, and mainly exists in the form of dihydrate gypsum, and a large number of researches show that if the industrial by-product gypsum is directly doped into common silicate-based concrete, the setting time of the concrete is seriously prolonged, and the mechanical strength is reduced. So far, the application of the industrial by-product gypsum in the ordinary portland cement-based material has not been broken through.
In order to efficiently utilize the industrial byproduct gypsum, the invention provides the application of the industrial byproduct gypsum in sulphoaluminate cement-based concrete on a large number of tests. The test result shows that the industrial by-product gypsum can be simultaneously doped into the sulphoaluminate cement-based concrete in the form of sulphoaluminate cement or fine aggregate substitute, and under the condition of a certain doping amount, the mechanical strength of the sulphoaluminate cement-based concrete can not be reduced, and the mechanical strength can be improved by about 14 percent. The invention not only can efficiently treat and highly utilize the industrial byproduct gypsum, reduce the environmental pollution caused by the industrial byproduct gypsum and the difficult problems of treatment and utilization, but also can reduce the cost of the sulphate aluminum cement-based concrete, improve the mechanical strength of the sulphate aluminum cement-based concrete under the condition of a certain mixing amount, and prepare a more efficient composite gelling system. Therefore, the method solves the problem of utilization of industrial byproduct gypsum, reduces the cost of the sulphoaluminate cement-based concrete, and has important economic, environmental, social and application values.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide sulphoaluminate cement-based concrete and a preparation method thereof, which solve the problem that the industrial byproduct gypsum is difficult to utilize and treat, further realize the purpose of efficiently and largely utilizing the industrial byproduct gypsum on the basis, and have very wide application prospects.
The purpose of the invention can be realized by the following technical scheme:
the sulphoaluminate cement-based concrete comprises the following raw materials in parts by weight: 14.076-16.565% of sulphoaluminate cement, 0.828-2.484% of industrial by-product gypsum, 24% of fine sand, 52% of stones, 7.44% of water and 0.014-0.017% of externally-doped retarder.
Further, the water cement ratio of the cement to the water is 0.45.
Furthermore, the sulphoaluminate cement is quick-hardening and quick-drying cement clinker, and the cement index is 42.5R.
Further, the main component of the industrial by-product gypsum is desulfurized gypsum (CaSO)
4·2H
2O), the character appeared as a pale yellow powder.
Further, the retarder is ascorbic acid (C)
6H
8O
6) And the amount of the retarder is 1/1000 of the amount of the cement.
The preparation process of the sulphoaluminate cement-based concrete comprises the following steps:
s1, weighing the raw materials according to the weight parts, putting the cement and the byproduct gypsum in the raw materials into a stirrer for dry stirring until the cement and the byproduct gypsum are uniform, and then putting the fine sand and the stones into the stirrer for stirring for 3min to be uniform;
s2, adding the weighed ascorbic acid into weighed water, and stirring until the ascorbic acid is completely dissolved;
s3, adding the solution prepared in the S2 into a stirrer, and stirring the slurry for 3min to be fully and uniformly;
and S4, after the materials are stirred, transferring the materials into a mold for vibration molding, and then, transferring the mold to a curing box for curing and demolding to obtain a finished product.
Further, the curing temperature of the curing box in the step S4 is controlled to be 22-24 ℃.
Further, the humidity of the curing box curing in the step S4 is controlled to be 90-92%.
The invention has the beneficial effects that:
1. compared with the prior art, the invention has the beneficial effects that: not only can consume the industrial by-product gypsum, solve the problem of difficult treatment, but also recover and promote the normal operation of the factory; but also can reduce the cost of building materials, realize the industrial waste utilization, and reduce the pollution of industrial byproduct gypsum to air, water and soil, thereby achieving multiple purposes.
2. The preparation method is simple, low in economic cost, high in yield and wide in industrial production prospect, is an important way for realizing effective utilization of industrial byproduct gypsum, and meets the requirement of environmental protection and green concept.
Drawings
FIG. 1 is a graph showing the data on the compressive strength of a sulphoaluminate cement-based concrete in the case where the industrial by-product gypsum of example 1 of the present invention is substituted for 5% cement.
FIG. 2 is a graph showing the data on the compressive strength of a sulphoaluminate cement-based concrete in the case where 10% of cement is replaced by industrial by-product gypsum in example 2 of the present invention.
FIG. 3 is a graph showing the data on the compressive strength of a sulphoaluminate cement-based concrete in the case where 15% of cement is replaced by industrial by-product gypsum in example 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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:
as shown in FIG. 1, the present invention provides a sulphoaluminate cement-based concrete comprising sulphoaluminate cement, industrial by-product gypsum, sand, stones, a retarder and tap water. The specific configuration is shown in table 1,
TABLE 1
Wherein: the fineness modulus of the fine sand is 2.3, the water-cement ratio is 0.45, and the retarder used is ascorbic acid (Vc for short).
A preparation process of sulphoaluminate cement-based concrete comprises the following steps:
s1, weighing the raw materials according to the weight parts, putting the cement and the byproduct gypsum in the raw materials into a stirrer for dry stirring until the cement and the byproduct gypsum are uniform, and then putting the fine sand and the stones into the stirrer for stirring for 3min to be uniform;
s2, adding the weighed ascorbic acid into weighed water, and stirring until the ascorbic acid is completely dissolved;
s3, adding the solution prepared in the S2 into a stirrer, and stirring the slurry for 3min to be fully and uniformly;
and S4, after the materials are stirred, transferring the materials into a mold for vibration molding, and then, transferring the mold to a curing box for curing and demolding to obtain a finished product.
Further, the curing temperature of the curing box in the step S4 is controlled to be 22-24 ℃.
Further, the humidity of the curing box curing in the step S4 is controlled to be 90-92%.
The following Table 1.1 shows the measurement of the compressive strength of the finished product (unit: MPa)
TABLE 1.1
Wherein 0% and 5% respectively represent the substitution ratio of the industrial by-product gypsum to the sulphoaluminate cement, and 0% Vc and 0.1% Vc respectively represent that Vc is not used and Vc accounting for 0.1% of the cement mass is used.
Example 2:
as shown in FIG. 2, the present invention provides a sulphoaluminate cement-based concrete comprising sulphoaluminate cement, industrial by-product gypsum, sand, stones, a retarder and tap water. The specific configuration is shown in table 2,
TABLE 2
| Item | Sulphoaluminate cement | Byproduct gypsum | Fine sand | Stone | Retarder | Water (W) |
| Reference group 1 | 2070 | 0 | 3000 | 6480 | 0 | 930 |
| Reference group 2 | 2070 | 0 | 3000 | 6480 | 2.070 | 930 |
| Reference group 5 | 1863 | 207 | 3000 | 6480 | 0 | 930 |
| Reference group 6 | 1863 | 207 | 3000 | 6480 | 1.863 | 930 |
Wherein: the fineness modulus of the fine sand is 2.3, the water-cement ratio is 0.45, and the retarder is Vc.
The same preparation method as in example 1 was used to obtain the final product.
The following Table 2.1 shows the measurement of the compressive strength of the finished product (unit: MPa)
TABLE 2.1
Wherein 0% and 10% respectively represent the substitution ratio of the industrial by-product gypsum to the sulphoaluminate cement, and 0% Vc and 0.1% Vc respectively represent that Vc is not used and Vc accounting for 0.1% of the cement mass is used.
Example 3:
as shown in fig. 3, the present invention provides a sulphoaluminate cement-based concrete comprising sulphoaluminate cement, industrial by-product gypsum, sand, stones, a retarder and tap water. The specific configuration is as shown in table 3,
TABLE 3
| Item | Sulphoaluminate cement | Byproduct gypsum | Fine sand | Stone | Retarder | Water (W) |
| Reference group 1 | 2070 | 0 | 3000 | 6480 | 0 | 930 |
| Reference group2 | 2070 | 0 | 3000 | 6480 | 2.070 | 930 |
| Reference group 7 | 1759.5 | 310.5 | 3000 | 6480 | 0 | 930 |
| Reference group 8 | 1759.5 | 310.5 | 3000 | 6480 | 1.760 | 930 |
Wherein: the fineness modulus of the fine sand is 2.3, the water-cement ratio is 0.45, and the retarder is Vc.
The same preparation method as in example 1 was used to obtain the final product.
The following Table 3.1 shows the measurements of the compressive strength of the finished products (unit: MPa)
TABLE 3.1
Wherein 0% and 15% respectively represent the substitution ratio of the industrial by-product gypsum to the sulphoaluminate cement, and 0% Vc and 0.1% Vc respectively represent that Vc is not used and Vc accounting for 0.1% of the cement mass is used.
The performance index of the macadam used in the application is in accordance with the secondary requirement in the GB/T14685 of the existing national standard pebble and macadam for construction.
If the industrial by-product gypsum is directly mixed into the ordinary portland cement-based concrete, the strength of the concrete at the age of 28 days is only 41.56MPa, 35.67MPa and 26.56MPa when the industrial by-product gypsum replaces 5%, 10% and 15% of the weight of the components of the conch cement, and the strength is respectively reduced by 15.22%, 27.23% and 45.82% compared with the ordinary portland cement-based concrete. In the embodiment of the invention, industrial by-product gypsum is mixed into sulphoaluminate cement-based concrete to replace cement components, and the strength of the concrete in the age of 28 days is respectively improved by 2.98 percent, 14.46 percent and 4.28 percent compared with the strength of the conventional sulphoaluminate cement-based concrete.
The industrial by-product gypsum is directly doped into the common silicate-based concrete, so that the concrete strength is reduced, and the concrete setting time is prolonged by 3-6h seriously; whereas for conventional sulphoaluminate cement based concrete with a setting time of only 20 minutes, the addition of desulphurised gypsum to the concrete improves its mouldability. Meanwhile, Vc is used in the example in a matching manner, so that the setting time of the concrete is controlled to be stable within 0.7-1h, and the concrete is ensured to meet the requirements of civil and commercial building specifications.
In conclusion, the sulphoaluminate cement-based concrete and the preparation process thereof provided by the invention have the advantages that the industrial by-product gypsum is used for replacing part of sulphoaluminate cement, the use amount of the sulphoaluminate cement-based concrete is controlled to be 0.828-2.484% of the total mass of the concrete, and a trace amount of Vc is used in combination, so that the problem of short setting time of the sulphoaluminate cement-based concrete can be solved, and the strength performance and the plasticity performance of the concrete can be improved.
The preparation process is simple to operate, low in material cost and energy consumption, capable of changing the harm into the treasure, clear in flow and suitable for industrial production. The sulphoaluminate cement-based concrete produced by the method has the advantages of high strength, high durability, high fire resistance, environmental protection and the like, and the embarrassment of low use rate of the sulphoaluminate cement-based concrete can be effectively improved in the concrete material. In the era of advocating environmental protection and energy saving at present, the prepared sulphoaluminate cement-based concrete is just in operation, and can be put into production on a large scale and widely used for civil and commercial buildings.
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 foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (8)
1. The sulphoaluminate cement-based concrete is characterized by comprising the following raw materials in parts by weight: 14.076-16.565% of sulphoaluminate cement, 0.828-2.484% of industrial by-product gypsum, 24% of fine sand, 52% of stones, 7.44% of water and 0.014-0.017% of externally-doped retarder.
2. The sulfoaluminate cement-based concrete of claim 1, wherein the cement to water cement ratio is 0.45.
3. The sulphoaluminate cement-based concrete according to claim 1, wherein the sulphoaluminate cement is a quick setting fast setting cement clinker having a cement index designation of 42.5R.
4. The sulfoaluminate cement-based concrete of claim 1, wherein the industrial by-product gypsum is desulfurized gypsum (CaSO) as a major component
4·2H
2O), the character appeared as a pale yellow powder.
5. The sulphoaluminate cement-based concrete according to claim 1, wherein the retarder is ascorbic acid (C)
6H
8O
6) And the amount of the retarder is 1/1000 of the amount of the cement.
6. Process for the preparation of sulphoaluminate cement-based concrete according to any one of claims 1 to 5, comprising the following steps:
s1, weighing the raw materials according to the weight parts, putting the cement and the byproduct gypsum in the raw materials into a stirrer for dry stirring until the cement and the byproduct gypsum are uniform, and then putting the fine sand and the stones into the stirrer for stirring for 3min to be uniform;
s2, adding the weighed ascorbic acid into weighed water, and stirring until the ascorbic acid is completely dissolved;
s3, adding the solution prepared in the S2 into a stirrer, and stirring the slurry for 3min to be fully and uniformly;
and S4, after the materials are stirred, transferring the materials into a mold for vibration molding, and then, transferring the mold to a curing box for curing and demolding to obtain a finished product.
7. The process for producing a sulphoaluminate cement-based concrete according to claim 6, wherein the curing temperature of the curing box in the step S3 is controlled to be 22-24 ℃.
8. The process for producing a sulphoaluminate cement-based concrete according to claim 6, wherein the humidity of curing the curing box in the step S3 is controlled to be 90-92%.
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| CN109721272A (en) * | 2019-01-03 | 2019-05-07 | 河海大学 | A kind of magnesia retarder based on multi-vitamins, combined oxidation magnesium and application |
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2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105879A (en) * | 1986-08-26 | 1988-03-16 | 山道士有限公司 | Recovery of waste concrete |
| KR20090013637A (en) * | 2007-08-02 | 2009-02-05 | 김용균 | Manufacturing process of high strength concrete used gypsum wastes(caso4 2h2o) |
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