CN115849758A - Core-shell structured tailing sand for concrete and preparation method thereof - Google Patents
Core-shell structured tailing sand for concrete and preparation method thereof Download PDFInfo
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Abstract
The invention provides tailing sand with a core-shell structure for concrete and a preparation method thereof, wherein the tailing sand is prepared from the following raw materials in parts by weight: 5 parts of tailing slurry, 0.3-2 parts of water-soluble long straight-chain type ultra-high molecular polymer, 0.2-1 part of high molecular emulsion, 0.02-0.5 part of high molecular water-absorbing resin, 0.01-0.1 part of cross-linking agent, 0.25-2 parts of portland cement and 0.25-0.5 part of quick-hardening cement. Compared with the tailings sand with the core-shell structure, the tailings sand for the concrete has excellent shapes (spherical shape) of river sand and machine-made sand, improves the workability of the concrete under the rolling effect, and reduces the mixing amount of water and an additive.
Description
Technical Field
The invention belongs to the field of concrete, and particularly relates to a tailing mud sand making process.
Background
With the continuous development of mining and steel industry, the storage capacity of tailings as the waste after mineral separation is also continuously increased. The improvement of the resource utilization rate of the tailings has important promotion significance for reducing the use pressure of the existing mineral resources, changing waste into valuable, promoting the national economic development, ensuring the iron resource supply and protecting the environment.
The tailings are similar to natural sand in main mineral components and are widely applied to manufacturing concrete, but concrete fine aggregates have the standard requirement of particle composition, the particle size of the tailings is 0.04-0.2mm, the specific surface area is too large, the tailings are called as 'mud' instead of 'sand', the water absorption capacity is large when the concrete is prepared, the admixture dosage is increased by several times, and meanwhile, the concrete is subjected to crack risk, so that the concrete can be prepared only by partially replacing (10-20%) the fine aggregates at present, and the consumption is low.
Disclosure of Invention
In view of the above, the present invention provides a core-shell structure tailing sand for concrete and a preparation method thereof, which aims to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the tailing sand with the core-shell structure for the concrete is prepared from the following raw materials in parts by weight:
5 parts of tail ore mud, namely 5 parts of,
0.3-2 parts of water-soluble long straight-chain type ultrahigh molecular polymer,
0.2 to 1 portion of macromolecular emulsion,
0.02-0.5 part of macromolecular water-absorbing resin,
0.01 to 0.1 portion of cross-linking agent,
0.25 to 2 portions of Portland cement,
0.25-0.5 part of quick setting cement.
Further, the water-soluble long straight chain type ultrahigh molecular polymer is polyacrylamide and/or sodium polyacrylate; the mass concentration of the water-soluble long straight-chain type ultrahigh molecular polymer is 0.1-5%; the molecular weight of the water-soluble long straight chain type ultrahigh molecular polymer is more than 1000 ten thousand.
Further, the high molecular emulsion is at least one of styrene-acrylic emulsion, pure acrylic emulsion, silicone-acrylic emulsion or vinyl acetate-ethylene copolymer emulsion; the concentration of the polymer emulsion is 30-50%;
the cross-linking agent is at least one of boric acid, triethanolamine borate or borax; the mass concentration of the cross-linking agent is 2-10%;
the high-molecular water-absorbing resin is polyacrylate synthetic resin; the quick-hardening cement is magnesium phosphate cement and/or sulphoaluminate cement.
The preparation method of the tailing sand with the core-shell structure for the concrete comprises the following steps:
step 1: uniformly mixing the tailing slurry and the water-soluble long straight-chain type ultrahigh molecular polymer, then respectively dropwise adding a cross-linking agent and a high molecular emulsion into the mixture under the condition of stirring, adding high molecular water-absorbent resin into the mixture after dropwise adding is finished, and uniformly mixing to obtain a sand making core;
step 2: and putting the sand making inner core into a granulator, uniformly scattering mixed cement in the rolling process, and uniformly spraying water to form a shell, thereby obtaining the tailing sand with the core-shell structure for the concrete.
Further, the solid-to-liquid ratio of the tailing slurry, the water-soluble long straight-chain type ultrahigh molecular polymer, the high molecular emulsion, the cross-linking agent and the high molecular water-absorbent resin in the step 1 is 5:0.3-2:0.2-1:0.01-0.1:0.02-0.5.
Further, the water-soluble long linear chain type ultrahigh molecular polymer is polyacrylamide and/or sodium polyacrylate; the mass concentration of the water-soluble long straight-chain type ultrahigh molecular polymer is 0.1-5%; the molecular weight of the water-soluble long straight chain type ultrahigh molecular polymer is more than 1000 ten thousand;
the high molecular emulsion is at least one of styrene-acrylic emulsion, pure acrylic emulsion, silicone acrylic emulsion or vinyl acetate-ethylene copolymer emulsion; the concentration of the polymer emulsion is 30-50%;
the cross-linking agent is at least one of boric acid, triethanolamine borate or borax; the mass concentration of the cross-linking agent is 2-10%;
the high-molecular water-absorbing resin is polyacrylate synthetic resin.
Further, the water content of the sand making core in the step 1 is 8-15%.
Further, the rotating speed of the stirring step in the step 1 is 100-3000r/min.
Further, the mixed cement in the step 2 is silicate cement and rapid hardening cement; the quick-hardening cement is magnesium phosphate cement and/or sulphoaluminate cement.
Further, the mass ratio of the sand making inner core in the step 2 to the quick-hardening cement and the portland cement is 5.86-10.1:0.25-0.5:0.25-2.
The tailing sand disclosed by the invention is used for preparing high-performance artificial sandstone by designing the matching of toughness and a rigid two-layer shell, and the tailing mud prepared sand is used as fine aggregate for concrete. As shown in fig. 1.
As artificial fine aggregate, the particle size can be controlled by regulating and controlling the water content of the tailing mud through the high-molecular water-absorbing resin, and meanwhile, energy consumption treatment is avoided.
Secondly, the tailing slurry is inert particles, the inert particles are required to be wound together like a wool ball to achieve a tough inner core, at the moment, a water-soluble long-straight-chain type ultrahigh molecular polymer and a water-resistant type high molecular emulsion are selected to prepare an interpenetrating structure, as shown in figure 2, the tailing sand is tightly wound together and has a water-resistant effect, and the phenomenon that the water absorption capacity is too high due to the fact that the shell still has a certain penetration type, and the concrete cost is too high is prevented.
Finally, the rigid shell selects rapid hardening type mud-magnesium phosphate cement or sulphoaluminate cement as a compound admixture of ordinary portland cement (ordinary cement), and the rapid hardening can be realized within a short time (a few minutes, the time can be regulated) so that the tailing sand can be accumulated and transported after being produced.
Compared with the prior art, the invention has the following advantages:
compared with the tailings sand with the core-shell structure, the tailings sand for the concrete has excellent shapes (spherical shape) of river sand and machine-made sand, improves the workability of the concrete under the rolling effect, and reduces the mixing amount of water and an additive.
The tailing sand with the core-shell structure for the concrete has controllable particle size, the particle size of the tailing sand can be adjusted by regulating and controlling the water content, and fine aggregate with excellent particle grading is compounded, so that the workability, the strength and the durability of the concrete are improved.
The tailing sand with the core-shell structure for the concrete has two layers of shells with toughness and rigidity, is high in strength and low in water absorption rate, further reduces the admixture mixing amount, improves the mechanical property of the concrete, and can be used as high-quality sand.
Drawings
FIG. 1 is a schematic illustration of a core-shell structure of tailings sand according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an interpenetrating structure prepared by the water-soluble long linear type ultra-high molecular polymer and the polymer emulsion according to the embodiment of the present invention.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, were all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The high molecular water-absorbing resin in each embodiment and the comparative example of the invention adopts high molecular water-absorbing resin WHS-700 produced by Wanhua chemistry;
in each example and comparative example of the present invention, the mass concentration of the water-soluble long linear chain type ultrahigh molecular polymer is 1%, the mass concentration of the high molecular emulsion is 40%, and the mass concentration of the crosslinking agent is 5%.
The present invention will be described in detail with reference to examples.
Example 1
The tailing sand with the core-shell structure for concrete is prepared from the following raw materials in parts by weight: 5 parts of tailing mud, 0.8 part of polyacrylamide, 0.5 part of pure acrylic emulsion, 0.03 part of macromolecular water-absorbent resin, 0.02 part of borax, 0.25 part of sulphoaluminate cement and 0.8 part of 42.5 ordinary portland cement.
A preparation method of tailing sand with a core-shell structure for concrete comprises the following steps:
step 1: uniformly mixing the tailing slurry and polyacrylamide, then adding borax and pure acrylic emulsion under the stirring condition, adding high-molecular water-absorbent resin after dropwise adding, and uniformly mixing to obtain a sand making core with the water content of 12%;
step 2: and putting the sand making core into a granulator, uniformly scattering sulphoaluminate cement and ordinary portland cement in the rolling process, and uniformly spraying water to form a shell, thereby obtaining the tailing sand with the core-shell structure for the concrete.
Example 2
The tailing sand with the core-shell structure for concrete is prepared from the following raw materials in parts by weight: 5 parts of tailing slurry, 1 part of polyacrylamide, 0.5 part of vinyl acetate-ethylene emulsion, 0.03 part of high-molecular water-absorbent resin, 0.03 part of borax, 0.25 part of magnesium phosphate cement and 0.8 part of 42.5 ordinary portland cement.
A preparation method of tailing sand with a core-shell structure for concrete comprises the following steps:
step 1: uniformly mixing the tailing slurry and polyacrylamide, then adding borax and vinyl acetate-ethylene emulsion under the stirring condition, adding high-molecular water-absorbent resin after dropwise adding is finished, and uniformly mixing to obtain a sand making core with the water content of 13%;
step 2: and putting the sand making core into a granulator, uniformly scattering magnesium phosphate cement and 42.5 ordinary portland cement in the rolling process, and uniformly spraying water to form a shell, thereby obtaining the tailing sand with the core-shell structure for the concrete.
Example 3
The tailing sand with the core-shell structure for the concrete is prepared from the following raw materials in parts by weight: 5 parts of tailing mud, 1 part of polyacrylamide, 0.5 part of silicone-acrylic emulsion, 0.03 part of macromolecular water-absorbent resin, 0.03 part of borax, 0.25 part of sulphoaluminate cement and 0.8 part of 42.5 ordinary portland cement.
A preparation method of tailing sand with a core-shell structure for concrete comprises the following steps:
step 1: uniformly mixing the tailing slurry and polyacrylamide, then adding borax and silicone-acrylate emulsion under the stirring condition, adding high-molecular water-absorbent resin after dropwise adding is finished, and uniformly mixing to obtain a sand making core with the water content of 13%;
step 2: and putting the sand making core into a granulator, uniformly scattering sulphoaluminate cement and 42.5 ordinary Portland cement in the rolling process, and uniformly spraying water to form a shell, thus obtaining the tailing sand with the core-shell structure for the concrete.
Comparative example 1
The tailing sand for concrete is prepared from the following raw materials in parts by weight: 5 parts of tailing mud, 0.8 part of polyacrylamide, 0.5 part of pure acrylic emulsion, 0.03 part of macromolecular water-absorbent resin, 0.02 part of borax, 0.25 part of sulphoaluminate cement and 0.8 part of 42.5 ordinary portland cement.
A preparation method of tailing sand for concrete comprises the following steps:
uniformly mixing the tailing slurry, the sulphoaluminate cement, the 42.5 ordinary portland cement and the polyacrylamide, then respectively dripping borax and pure acrylic emulsion into the mixture under the condition of stirring, adding the high-molecular water-absorbing resin into the mixture after finishing dripping, and uniformly mixing to obtain the artificial tailing sand.
Comparative example 2
The tailing sand with the core-shell structure for concrete is prepared from the following raw materials in parts by weight: 5 parts of tailing mud, 0.8 part of polyacrylamide, 0.03 part of high-molecular water-absorbent resin, 0.02 part of borax, 0.25 part of sulphoaluminate cement and 0.8 part of 42.5 ordinary portland cement.
A preparation method of tailing sand with a core-shell structure for concrete comprises the following steps:
step 1: uniformly mixing the tailing slurry and polyacrylamide, then respectively dropwise adding borax into the tailing slurry and the polyacrylamide under the stirring condition, adding high-molecular water-absorbent resin into the mixture after the dropwise adding is finished, and uniformly mixing to obtain a sand making core;
step 2: and putting the sand making core into a granulator, uniformly scattering sulphoaluminate cement and 42.5 ordinary Portland cement in the rolling process, and uniformly spraying water to form a shell, thereby finally obtaining the tailing sand with a core-shell structure.
Comparative example 3
The tailing sand with the core-shell structure for concrete is prepared from the following raw materials in parts by weight: 5 parts of tailing mud, 0.5 part of pure acrylic emulsion, 0.03 part of macromolecular water-absorbent resin, 0.02 part of borax, 0.25 part of sulphoaluminate cement and 0.8 part of 42.5 ordinary portland cement.
A preparation method of tailing sand with a core-shell structure for concrete comprises the following steps:
step 1: uniformly stirring the tailing mud and the pure acrylic emulsion, adding high-molecular water-absorbing resin into the mixture, and uniformly mixing to obtain a sand making core;
step 2: and putting the sand making core into a granulator, uniformly scattering sulphoaluminate cement and 42.5 ordinary Portland cement in the rolling process, and uniformly spraying water to form a shell, thereby finally obtaining the tailing sand with a core-shell structure.
Comparative example 4
The tailing sand with the core-shell structure for concrete is prepared from the following raw materials in parts by weight: 5 parts of tailing slurry, 0.8 part of polyacrylamide, 0.5 part of pure acrylic emulsion, 0.02 part of borax, 0.25 part of sulphoaluminate cement and 0.8 part of 42.5 ordinary portland cement.
A preparation method of tailing sand with a core-shell structure for concrete comprises the following steps:
step 1: uniformly mixing the tailing slurry and polyacrylamide, then respectively dropwise adding borax and pure acrylic emulsion into the mixture under the stirring condition, and uniformly mixing to obtain a sand making inner core with the water content of 22%;
step 2: and putting the sand making core into a granulator, uniformly scattering mixed cement in the rolling process, and uniformly spraying water to form a shell, thereby finally obtaining the tailing sand with a core-shell structure.
Comparative example 5
The tailing sand with a core-shell structure for concrete is prepared from 5 parts of tailing mud, 0.8 part of polyacrylamide, 0.5 part of pure acrylic emulsion, 0.03 part of high-molecular water-absorbent resin, 0.02 part of borax and 0.8 part of 42.5 ordinary portland cement by weight.
A preparation method of tailing sand with a core-shell structure for concrete comprises the following steps:
step 1: uniformly mixing the tailing slurry and polyacrylamide, then respectively dropwise adding borax and pure acrylic emulsion under the stirring condition, adding high-molecular water-absorbent resin after dropwise adding is finished, and uniformly mixing to obtain a sand making core;
and 2, step: and putting the sand-making inner core into a granulator, uniformly scattering 42.5 common portland cement in the rolling process, and uniformly spraying water to form an outer shell, thereby finally obtaining the tailing sand with a core-shell structure.
The experimental method comprises the following steps:
the slump, the expansion and the 28-day compressive strength tests of the concrete refer to GB8076-2008 concrete admixture.
Stacking and crushing rate: filling tailing sand into a hollow hard plastic pipe with the length of 3m and the diameter of 6cm, putting a 5kg weight into a reserved space, vertically placing for 24 hours, pouring out and sieving, and weighing the mass of crushed sand. Crushed sand mass/total sand mass = pile-up breakage rate/%.
TABLE 1 concrete mix proportion (kg/m) 3 ）
Note: the admixture dosage is calculated by the cement amount.
TABLE 2 test results
Note: 1. the blank sample is concrete prepared by river sand;
2. the admixture dosage is the dosage for reaching the same concrete expansion/slump.
Compared with river sand and machine-made sand, the concrete has excellent grain shape (spherical shape), improves the workability of the concrete under the rolling effect, reduces the mixing amount of water and the additive, has two layers of shells with toughness and rigidity, has high hardness and low water absorption, further reduces the mixing amount of the additive and improves the mechanical property of the concrete. The existence of hard shells results in low stacking breakage rate.
The comparative example 1 is a non-core-shell structure, that is, the surface layer of the tailing sand is a blended substance of water-soluble ultra-long straight-chain type ultra-high molecular polymer such as tailing mud and polyacrylamide, high molecular emulsion such as pure acrylic emulsion, rapid hardening cement such as sulphoaluminate and common portland cement, the water absorption of the tailing sand is reduced by the interpenetrating network structure of the high molecular polymer and the interpenetrating hardening of the cement, but the surface of the tailing sand still has the existence of the tailing mud and the water-soluble ultra-long straight-chain type ultra-high molecular polymer and still has a certain contact with water of a concrete system, so the rolling effect can reduce the admixture dosage, but still has a certain water absorption condition, so the admixture dosage is higher than the comparative ratio, and the compressive strength is lower than that of the mixed cement, because the blending hardening strength of several components is slightly lower than that of the mixed cement, the difference is not large, but the concrete mechanical properties are still reflected correspondingly. The existence of the hard shell results in low stacking and breaking rate.
Comparative example 2 has poor water resistance of the core because of no high molecular emulsion, and the shell is a cement-based material and has a certain permeability, so that a certain amount of water permeates into the core during concrete stirring, resulting in an increase in water absorption, and the water-cement ratio is fixed, so that more additives need to be added, resulting in cost waste. However, the compressive strength of the concrete is also reduced because the strength of the inner core of the high molecular emulsion is not reduced, and the water absorption micro-expansion effect has a certain influence on the outer shell, but has no obvious influence on the accumulation, and the breaking rate is still acceptable.
Comparative example 3, the core can not be tightly wound together without water-soluble long-straight-chain ultrahigh molecular polymer, so the prepared core has insufficient toughness, and the water resistance and the toughness of the core can be improved by using a pure high molecular emulsion, but the water absorption of the tailing sand is relatively high because the molecular weight is low and the addition amount needs to be increased by at least 5 times on the basis, the cost is very high and the popularization cannot be realized. Meanwhile, the toughness of the inner core is not enough to influence the hardness of the whole sand, so that the strength of the concrete is also influenced. The existence of the hard shell results in low stacking and breaking rate.
In comparative example 4, the water content was high without super absorbent resin, the prepared tailing sand core had too large particle size and round particle size, and the fluidity was improved and the admixture amount was reduced under the rolling effect. However, because the hardness of the inner core is lower than that of the outer shell, the hardness of the tailing sand is relatively weak, and the particles are large, so that a weak area is formed in the structure of the concrete test block, and the strength of the concrete is obviously reduced. The existence of the hard shell results in low stacking and breaking rate.
Comparative example 5 has no quick-hardening cement, the final setting of ordinary portland cement requires at least 7-8h, and even if the final setting is carried out, the strength is very small, so that the hardness of the surface shell of the freshly prepared tailing sand is almost zero, the stacking fracture rate is as high as 12%, and the protection effect of the hard shell cannot be provided for the inner core when the concrete is prepared, so that the water absorption rate is increased, and the admixture mixing amount is increased. The compression strength is not greatly affected because the ordinary portland cement is slowly hardened and reaches the highest strength in 28 days, so that the compression strength of the concrete is not greatly affected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The tailing sand with the core-shell structure for concrete is characterized in that: the tailing sand is prepared from the following raw materials in parts by weight:
5 parts of tail ore mud, namely 5 parts of,
0.3-2 parts of water-soluble long straight-chain type ultrahigh molecular polymer,
0.2 to 1 portion of macromolecular emulsion,
0.02-0.5 part of macromolecular water-absorbing resin,
0.01 to 0.1 portion of cross-linking agent,
0.25 to 2 portions of Portland cement,
0.25-0.5 part of quick-setting cement.
2. The core-shell structure tailings sand for concrete according to claim 1, wherein: the water-soluble long straight chain type ultrahigh molecular polymer is polyacrylamide and/or sodium polyacrylate; the mass concentration of the water-soluble long linear chain type ultrahigh molecular polymer is 0.1-5%; the molecular weight of the water-soluble long linear chain type ultrahigh molecular polymer is more than 1000 ten thousand.
3. The core-shell structure tailings sand for concrete according to claim 1, wherein: the high molecular emulsion is at least one of styrene-acrylic emulsion, pure acrylic emulsion, silicone acrylic emulsion or vinyl acetate-ethylene copolymer emulsion; the concentration of the polymer emulsion is 30-50%;
the cross-linking agent is at least one of boric acid, triethanolamine borate or borax; the mass concentration of the cross-linking agent is 2-10%;
the high-molecular water-absorbing resin is polyacrylate synthetic resin; the quick-hardening cement is magnesium phosphate cement and/or sulphoaluminate cement.
4. A method for preparing the core-shell structure-containing tailings for concrete according to any one of claims 1 to 3, wherein: the method comprises the following steps:
step 1: uniformly mixing the tailing slurry and the water-soluble long straight-chain type ultrahigh molecular polymer, then respectively dropwise adding a cross-linking agent and a high molecular emulsion into the mixture under the condition of stirring, adding high molecular water-absorbent resin into the mixture after dropwise adding is finished, and uniformly mixing to obtain a sand making core;
step 2: and putting the sand making inner core into a granulator, uniformly scattering mixed cement in the rolling process, and uniformly spraying water to form a shell, thereby obtaining the tailing sand with the core-shell structure for the concrete.
5. The method for preparing the core-shell structure tailings sand for concrete according to claim 4, wherein the core-shell structure tailings sand comprises: the solid-to-liquid ratio of the tailing slurry, the water-soluble long straight-chain type ultrahigh molecular polymer, the high molecular emulsion, the cross-linking agent and the high molecular water-absorbent resin in the step 1 is 5:0.3-2:0.2-1:0.01-0.1:0.02-0.5.
6. The method for preparing the core-shell structure tailings sand for concrete according to claim 4, wherein the core-shell structure tailings sand comprises: the water-soluble long straight chain type ultrahigh molecular polymer is polyacrylamide and/or sodium polyacrylate; the mass concentration of the water-soluble long straight-chain type ultrahigh molecular polymer is 0.1-5%; the molecular weight of the water-soluble long straight chain type ultrahigh molecular polymer is more than 1000 ten thousand;
the high molecular emulsion is at least one of styrene-acrylic emulsion, pure acrylic emulsion, silicone acrylic emulsion or vinyl acetate-ethylene copolymer emulsion; the concentration of the polymer emulsion is 30-50%;
the cross-linking agent is at least one of boric acid, triethanolamine borate or borax; the mass concentration of the cross-linking agent is 2-10%;
the high-molecular water-absorbing resin is polyacrylate synthetic resin.
7. The method for preparing the core-shell structure tailings for concrete according to claim 4, wherein the core-shell structure tailings are prepared by the following steps: the water content of the sand making core in the step 1 is 8-15%.
8. The method for preparing the core-shell structure tailings sand for concrete according to claim 4, wherein the core-shell structure tailings sand comprises: the rotating speed of the stirring step in the step 1 is 100-3000r/min.
9. The method for preparing the core-shell structure tailings sand for concrete according to claim 4, wherein the core-shell structure tailings sand comprises: the mixed cement in the step 2 is silicate cement and quick-hardening cement; the quick-hardening cement is magnesium phosphate cement and/or sulphoaluminate cement.
10. The method for preparing the core-shell structure tailings for concrete according to claim 9, wherein the core-shell structure tailings are prepared by: the mass ratio of the sand making inner core to the quick-hardening cement and the portland cement in the step 2 is 5.86-10.1:0.25-0.5:0.25-2.
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Citations (5)
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|---|---|---|---|---|
| EP0654454A1 (en) * | 1993-11-22 | 1995-05-24 | Rohm And Haas Company | A core-shell polymer powder |
| CN101100000A (en) * | 2007-06-05 | 2008-01-09 | 暨南大学 | Core-shell structure composite nanometer material and preparation method thereof |
| CN103496866A (en) * | 2013-09-23 | 2014-01-08 | 东南大学 | Preparation method of novel core-shell type cement-based high-strength lightweight aggregate |
| CN112456916A (en) * | 2020-12-09 | 2021-03-09 | 江苏昆腾新材料科技有限公司 | Preparation method of high-iron-tailing-sand-doped self-compacting concrete |
| CN112707663A (en) * | 2021-01-30 | 2021-04-27 | 北京工业大学 | Preparation method of red mud core-shell structure fine aggregate |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0654454A1 (en) * | 1993-11-22 | 1995-05-24 | Rohm And Haas Company | A core-shell polymer powder |
| CN101100000A (en) * | 2007-06-05 | 2008-01-09 | 暨南大学 | Core-shell structure composite nanometer material and preparation method thereof |
| CN103496866A (en) * | 2013-09-23 | 2014-01-08 | 东南大学 | Preparation method of novel core-shell type cement-based high-strength lightweight aggregate |
| CN112456916A (en) * | 2020-12-09 | 2021-03-09 | 江苏昆腾新材料科技有限公司 | Preparation method of high-iron-tailing-sand-doped self-compacting concrete |
| CN112707663A (en) * | 2021-01-30 | 2021-04-27 | 北京工业大学 | Preparation method of red mud core-shell structure fine aggregate |
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