CN114349407A - Preparation method of high-strength anti-cracking and anti-impact concrete and high-strength anti-cracking and anti-impact concrete - Google Patents
Preparation method of high-strength anti-cracking and anti-impact concrete and high-strength anti-cracking and anti-impact concrete Download PDFInfo
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Abstract
The invention provides a preparation method of high-strength anti-cracking and anti-impact concrete and the high-strength anti-cracking and anti-impact concrete prepared by the method. In the method provided by the invention, the use amount of cement is reduced, the economic cost is saved and natural resources are protected by utilizing industrial solid wastes such as copper slag, slag and the like. The wet grinding treatment mode improves the pozzolanic activity of the copper slag and the slag to a greater extent, so that the impact-resistant concrete has higher compressive strength, flexural strength and tensile strength.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a preparation method of high-strength anti-cracking impact-resistant concrete and the high-strength anti-cracking impact-resistant concrete prepared by the method.
Background
Because of the widespread use of concrete materials, this also subjects more and more concrete structures to frequent or accidental impact loads, such as the impact of aircraft landing on airport runways, the impact of sea structures with waves, the impact of bombs on protective structures and civil buildings where strong earthquakes may occur in earthquake zones. However, conventional concrete has limited deformation and poor energy absorption, which presents particular challenges to the safety of concrete structures under impact loading conditions. Although cementitious materials have high compressive strength, they also have brittle fracture characteristics, so it is necessary to produce concrete with high crack resistance while satisfying the strength.
Accordingly, in recent years, active research has been conducted into fiber cement-based composite materials, which exhibit high bending and tensile characteristics by absorbing and distributing impact stress by utilizing the adhesive properties and crosslinking reaction between fiber cement matrices, thereby controlling the cracking of the cement matrices. However, while meeting crack resistance, the incorporation of steel fibers may introduce other disadvantages, such as increased structural weight due to high density of steel fibers, and further, steel fibers are highly susceptible to corrosion in moisture and air, reducing the durability of the structural material.
Patent 201810455234.3 discloses a concrete prepared by using double spiral fibers, which has a reinforcing effect in crack resistance compared with the conventional fiber concrete, but cannot realize the impact resistance and the anti-explosion performance of the concrete because of the limited negative poisson ratio of the fiber structure involved in the concrete.
Disclosure of Invention
The invention aims to: on one hand, the characteristics of poor compressive strength and breaking strength of the high-strength anti-cracking impact-resistant concrete prepared by the traditional method are overcome; on the other hand, the cohesiveness among the aggregates is improved, so that the concrete can well absorb energy and uniformly disperse the energy under the impact of high energy in an impact resistance test, and micro cracks and even damage caused by stress concentration are avoided. Therefore, the invention provides the preparation method of the high-strength anti-cracking and anti-impact concrete, which saves cost, protects the environment, meets the requirements of compressive strength and bending strength, effectively absorbs impact energy and avoids impact damage, and the high-strength anti-cracking and anti-impact concrete prepared by the method.
The invention provides a preparation method of high-strength anti-cracking impact-resistant concrete, which is characterized by comprising the following steps:
(1) carrying out dry grinding on the copper slag and the slag to powder by using a roller dry grinding machine to respectively obtain copper slag powder and slag powder;
(2) taking 190-210 parts by weight of the copper slag powder and 85-105 parts by weight of water, adding 0.1-0.2 part by weight of a water reducing agent, wet-milling for 35-45min by using a vertical ball mill to obtain copper slag slurry, and recording the copper slag slurry as slurry A;
taking 100 plus 120 parts by weight of the slag powder and 100 plus 120 parts by weight of water, adding 0.1-0.3 part by weight of a water reducing agent, wet-grinding for 15-25min to obtain slag powder slurry, and recording the slag powder slurry as slurry B;
(3) cutting the waste rubber into rubber scraps by using a crusher;
(4) preparing asphalt coating coarse aggregate: preparing coal gangue coarse aggregate in advance; and then placing the asphalt in a steel basin and melting the asphalt by using a constant-temperature electromagnetic oven, when the temperature of the asphalt reaches 100-: asphalt coating coarse aggregate;
(5) mixing 10-20 parts by weight of the slurry A prepared in the step (2), 30-40 parts by weight of the slurry B and 50-60 parts by weight of cement to obtain a cementing material;
mixing 20-60 parts by weight of the rubber crumbs prepared in the step (3) with 140-180 parts by weight of copper tailings to obtain fine aggregate;
pouring the cementing material into a stirrer, mixing and stirring for 30-60s, then adding 1-2 parts by weight of amorphous metal fibers, continuously stirring for 1-2min, finally pouring the fine aggregate, the coarse aggregate of the asphalt coating prepared in the step (4) of 280-320 parts by weight and 0.5-2 parts by weight of a water reducing agent, and uniformly stirring.
2. The method as described in item 1, wherein the copper slag and the slag in the step (1) are both waste slag generated in industrial production, the color of the copper slag is gray black, and the specific surface area is 370-2Per kg; SiO in slag2And Al2O3The content of (A) is 25-35% and 5-15% respectively.
3. The method according to claim 1, wherein the water-reducing agent in the steps (2) and (5) is a mixed water-reducing agent obtained by mixing a polycarboxylic acid and a naphthalene-based water-reducing agent in a weight ratio of 1: 1.
4. The method as set forth in item 1, wherein the rotation speed of the attritor in step (2) is 350-450 r/s.
5. The method according to item 1, wherein in step (2), the median particle diameter of copper slag in the copper slag slurry is 1.5 to 2.3 μm, and the median particle diameter of slag in the slag powder slurry is 3 to 4 μm.
6. The method according to item 1, wherein in step (3), the rubber crumbs have a particle size in the range of 1 to 4 mm.
7. The method according to item 1, wherein in the step (4), the coal gangue coarse aggregate is prepared by mixing two coal gangues with an average particle size of 5-10mm and an average particle size of 10-16mm in a mass ratio of 4:6, the asphalt coating coarse aggregate needs to be cooled to room temperature in an isolated manner, and the thickness of the asphalt coating is 80-120 μm.
8. The method as set forth in item 1, wherein in the step (4), the rotation speed of the electric stirrer is 150-.
9. The method according to item 1, wherein in the step (5), the amorphous metal fibers have an equivalent diameter of 0.2-0.3mm, an aspect ratio of 110-130, and a density of 7-7.5g/cm3。
10. The high-strength anti-cracking impact-resistant concrete prepared by the method of any one of items 1 to 9.
The invention has the following beneficial effects:
1. the wet grinding treatment of the copper slag and the slag can effectively stimulate the potential gelling characteristics of the copper slag and the slag and promote the generation of system strength, and in addition, the slag contains high amount of SiO2And Al2O3Thus ensuring the continuous hydration reaction.
2. Slag is used as one of the system auxiliary cementing materials, and can improve the bonding interface of rubber scraps and a cement matrix.
3. The copper slag treated by wet grinding enhances the bonding effect of copper slag particles and hydration products, obviously improves the interface performance, and can ensure sufficient mechanical property without damage when being subjected to external force.
4. The rubber fragments contained in the fine aggregate are beneficial to absorbing impact energy, thereby obviously improving the impact resistance and delaying the generation and the expansion of cracks in concrete.
5. The use of the solid waste copper slag powder-slag powder cementing material and the use of rubber, copper tailings and coal gangue coarse aggregate saves cost and protects ecological environment.
6. The amorphous metal fibers have light weight, low density, larger specific surface area and rough surface, so that the amorphous metal fibers have good bonding performance with a cement matrix, and the bonding interface of a cementing material and aggregate is improved; the amorphous metal fiber with larger major diameter can obviously improve the bending and stretching performance of concrete and effectively inhibit the generation of cracks.
7. The asphalt coating coarse aggregate can effectively relieve and absorb huge energy, relieve stress concentration in an interface transition region, avoid generation of more cracks and improve the impact resistance and the crack resistance.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
According to the invention, the wet-milled copper slag is used as a part of cementing material to replace the traditional preparation method of the anti-cracking and anti-impact concrete, only silica fume is used as the cementing material, the strength of the high-strength concrete can be met, and the cost is reduced because the copper slag waste slag is used; wet grinding slag replaces part of cement, and the content of aluminosilicate in the system is supplemented; the rubber scraps and the copper tailings are used for replacing quartz sand used in the traditional preparation method of the anti-cracking and anti-impact concrete, so that the anti-cracking and anti-impact capacity can be improved; the use of the amorphous metal fiber can improve the bending and stretching properties of concrete and improve the shock resistance; the asphalt coating can further improve and optimize the workability and the impact resistance of the concrete, so that the energy-saving and environment-friendly high-strength anti-cracking impact-resistant concrete can be prepared.
The copper slag, the rubber scraps, the copper tailings and the coal gangue are consigned from an industrial site. The water reducing agent can be a water reducing agent commonly used in the field, and aims to improve the fluidity of the slurry and reduce the water consumption; for example, a water reducing agent obtained by mixing a polycarboxylic acid water reducing agent and a naphthalene water reducing agent at a weight ratio of 1:1, which was used in the examples of the present invention and the comparative examples, was commercially available. Amorphous metal fibers are commercially available and asphalt coated coarse aggregates are spontaneously developed.
Example 1:
a high-strength anti-cracking impact-resistant concrete and a preparation method thereof comprise the following steps:
(1) copper slag and slag (both industrial waste slag and copper slag are gray black in color and have specific surface area of 390 m) by using a roller dry mill2Per kg; SiO in slag2And Al2O3Respectively 31 wt% and 11 wt%) to powder, and respectively obtaining copper slag powder and slag powder;
(2) taking 200 parts by weight of copper slag powder and 100 parts by weight of water, adding 0.1 part by weight of water reducing agent, wet-milling for 40min by using a vertical ball mill (the rotating speed is 400r/s) to obtain copper slag slurry, and recording the copper slag slurry as slurry A;
taking 100 parts by weight of the slag and 100 parts by weight of water, adding 0.2 part by weight of a water reducing agent, wet-grinding for 20min to obtain slag powder slurry, and recording the slurry as slurry B;
wherein the median particle size of copper slag in the copper slag slurry is 2 μm, and the median particle size of slag in the slag powder slurry is 3.5 μm;
(3) cutting the waste rubber into rubber scraps by using a crusher; wherein the particle size of the rubber crumbs ranges from 1 mm to 4 mm;
(4) preparing asphalt coating coarse aggregate: preparing coal gangue coarse aggregate in advance, wherein the coal gangue coarse aggregate is formed by mixing two coal gangues with the average particle size of 8mm and the average particle size of 13mm according to the mass ratio of 4: 6;
then placing the asphalt in a steel basin and melting the asphalt by using a constant-temperature induction cooker, when the temperature of the asphalt reaches 105 ℃, pouring the prepared coal gangue coarse aggregate into the steel basin to be mixed with the asphalt, and finally stirring the mixture for 5min by using an electric stirrer (the rotating speed is 170r/min) to obtain the coarse aggregate with the asphalt coating, namely: the asphalt coating coarse aggregate needs to be cooled to room temperature in an isolated manner, and the thickness of the asphalt coating is 80 microns;
(5) taking 20 parts by weight of the slurry A prepared in the step (2), 30 parts by weight of the slurry B and 50 parts by weight of cement, and mixing to obtain a cementing material;
mixing 20 parts by weight of the rubber scraps prepared in the step (3) with 180 parts by weight of copper tailings to obtain fine aggregate;
pouring the cementing material into a stirrer, mixing and stirring for 30s, and then adding 1 part by weight of amorphous metal fiber (the equivalent diameter is 0.25mm, the length-diameter ratio is 120, and the density is 7.2 g/cm)3) Continuously stirring for 2mAnd (3) in, finally, pouring the fine aggregate, 300 parts by weight of the coarse aggregate of the asphalt coating prepared in the step (4) and 1 part by weight of the water reducing agent, and uniformly stirring.
Example 2:
a high-strength anti-cracking impact-resistant concrete and a preparation method thereof comprise the following steps:
(1) copper slag and slag (both industrial waste slag and copper slag are gray black in color and have specific surface area of 390 m) by using a roller dry mill2Per kg; SiO in slag2And Al2O3Respectively in an amount of 25 wt% and 5 wt%) to be dry-ground into powder, respectively obtaining copper slag powder and slag powder;
(2) taking 190 parts by weight of copper slag powder and 85 parts by weight of water, adding 0.2 part by weight of water reducing agent, wet-milling for 35min by using a vertical ball mill (the rotating speed is 350r/s) to obtain copper slag slurry, and recording the copper slag slurry as slurry A;
taking 110 parts by weight of slag and 110 parts by weight of water, adding 0.1 part by weight of water reducing agent, wet-grinding for 15min to obtain mineral powder slurry, and recording the mineral powder slurry as slurry B;
wherein the median particle size of copper slag in the copper slag slurry is 1.5 μm, and the median particle size of slag in the slag powder slurry is 3 μm;
(3) cutting the waste rubber into rubber scraps by using a crusher; wherein the particle size of the rubber crumbs ranges from 1 mm to 4 mm;
(4) preparing asphalt coating coarse aggregate: preparing coal gangue coarse aggregate in advance, wherein the coal gangue coarse aggregate is formed by mixing two coal gangues with the average particle size of 5mm and the average particle size of 10mm according to the mass ratio of 4: 6;
then placing the asphalt in a steel basin and melting the asphalt by using a constant-temperature induction cooker, when the temperature of the asphalt reaches 100 ℃, pouring the prepared coal gangue coarse aggregate into the steel basin to be mixed with the asphalt, and finally stirring the mixture for 3min by using an electric stirrer (the rotating speed is 150r/min) to obtain the coarse aggregate with the asphalt coating, namely: the asphalt coating coarse aggregate needs to be cooled to room temperature in an isolated manner, and the thickness of the asphalt coating is 100 mu m;
(5) taking 15 parts by weight of the slurry A prepared in the step (2), 35 parts by weight of the slurry B and 55 parts by weight of cement, and mixing to obtain a cementing material;
mixing 30 parts by weight of the rubber scraps prepared in the step (3) with 170 parts by weight of copper tailings to obtain fine aggregate;
pouring the cementing material into a stirrer, mixing and stirring for 45s, and then adding 2 parts by weight of amorphous metal fiber (the equivalent diameter is 0.2mm, the length-diameter ratio is 110, and the density is 7 g/cm)3) And (4) continuing stirring for 1min, finally pouring the fine aggregate, 280 parts by weight of the coarse aggregate of the asphalt coating prepared in the step (4) and 0.5 part by weight of the water reducing agent, and uniformly stirring.
Example 3:
a high-strength anti-cracking impact-resistant concrete and a preparation method thereof comprise the following steps:
(1) copper slag and slag (both industrial waste slag and copper slag are gray black in color and have a specific surface area of 410 m) are dried and ground by a roller dry grinding machine2Per kg; SiO in slag2And Al2O3Respectively, 35 wt% and 15 wt%) to be powder-like, and respectively obtaining copper slag powder and slag powder;
(2) taking 210 parts by weight of copper slag powder and 105 parts by weight of water, adding 0.2 part by weight of water reducing agent, wet-milling for 45min by using a vertical ball mill (the rotating speed is 450r/s) to obtain copper slag slurry, and recording the copper slag slurry as slurry A;
taking 120 parts by weight of slag and 120 parts by weight of water, adding 0.3 part by weight of water reducing agent, wet grinding for 25min to obtain mineral powder slurry, and recording the mineral powder slurry as slurry B;
wherein the median particle size of copper slag in the copper slag slurry is 2.3 μm, and the median particle size of slag in the slag powder slurry is 4 μm;
(3) cutting the waste rubber into rubber scraps by using a crusher; wherein the particle size of the rubber crumbs ranges from 1 mm to 4 mm;
(4) preparing asphalt coating coarse aggregate: preparing coal gangue coarse aggregate in advance, wherein the coal gangue coarse aggregate is formed by mixing two coal gangues with the average grain diameter of 10mm and the average grain diameter of 16mm according to the mass ratio of 4: 6;
and then placing the asphalt in a steel basin and melting the asphalt by using a constant-temperature induction cooker, when the temperature of the asphalt reaches 110 ℃, pouring the prepared coal gangue coarse aggregate into the steel basin to be mixed with the asphalt, and finally stirring the mixture for 8min by using an electric stirrer (the rotating speed is 190r/min) to obtain the coarse aggregate with the asphalt coating, namely: the asphalt coating coarse aggregate needs to be cooled to room temperature in an isolated manner, and the thickness of the asphalt coating is 120 mu m;
(5) mixing 10 parts by weight of the slurry A prepared in the step (2), 40 parts by weight of the slurry B and 60 parts by weight of cement to obtain a cementing material;
mixing 60 parts by weight of the rubber scraps prepared in the step (3) with 140 parts by weight of copper tailings to obtain fine aggregate;
pouring the cementing material into a stirrer, mixing and stirring for 60s, and then adding 2 parts by weight of amorphous metal fiber (the equivalent diameter is 0.3mm, the length-diameter ratio is 130, and the density is 7.5 g/cm)3) And (4) continuing stirring for 1min, finally pouring the fine aggregate, 320 parts by weight of the coarse aggregate of the asphalt coating prepared in the step (4) and 2 parts by weight of the water reducing agent, and uniformly stirring.
Example 4:
in example 4, a high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 1, except that 40 parts by weight of the rubber crumbs prepared in step (3) were taken as fine aggregate after mixing with 160 parts by weight of the copper tailings in step (5), and 1.5 parts by weight of amorphous metal fibers were used.
Example 5:
in example 5, high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 1, except that 40 parts by weight of the rubber crumbs prepared in step (3) were taken as fine aggregate after mixing with 160 parts by weight of copper tailings in step (5), and 2 parts by weight of amorphous metal fiber was used.
Example 6:
in example 6, high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 3, except that the thickness of the asphalt coating layer in the asphalt coated coarse aggregate prepared in step (4) was 100 μm, and 40 parts by weight of the rubber crumbs prepared in step (3) were mixed with 160 parts by weight of the copper tailings as fine aggregates in step (5).
Example 7:
in example 7, a high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 3, except that 40 parts by weight of the rubber crumbs prepared in step (3) were mixed with 160 parts by weight of the copper tailings as fine aggregate in step (5).
Comparative example 1:
comparative example 1, which is used for comparison with example 5, illustrates that the high-strength crack-resistant and impact-resistant concrete prepared using the coal gangue coarse aggregate without the asphalt coating has poor compressive strength, impact resistance and crack resistance.
In comparative example 1, a high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 5, except that step (4) was omitted and a coal gangue coarse aggregate not containing an asphalt coating was added in step (5).
Comparative example 2:
comparative example 2, which is used for comparison with example 5, shows that the high-strength crack-resistant and impact-resistant concrete obtained when no rubber crumbs were used in the fine aggregate was inferior in compressive strength, impact resistance and crack resistance.
In comparative example 2, a high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 5, except that step (3) was omitted and no rubber crumbs were added in step (5) and 200 parts by weight of copper tailings were used as fine aggregates.
Comparative example 3:
comparative example 3, which is used to compare with example 5, shows that the high-strength crack-resistant and impact-resistant concrete obtained without using amorphous metal fibers has poor compressive strength, flexural strength, tensile strength, impact resistance and crack resistance.
In comparative example 3, a high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 5, except that the amorphous metal fiber was not added in step (5).
Comparative example 4:
comparative example 4, which is used to compare with example 5, illustrates that the high-strength crack-resistant and impact-resistant concrete prepared by the prior art without using slurry A and slurry B has poor compressive strength, breaking strength, tensile strength, impact resistance and crack resistance.
In comparative example 4, high strength, crack resistant and impact resistant concrete was prepared in the same manner as in example 5, except that step (1) and step (2) were omitted and slurry a and slurry B were not added in step (5).
The following experiments were performed on the high-strength, crack-resistant and impact-resistant concrete samples prepared in examples 1 to 7 and comparative examples 1 to 4, and the experimental results are shown in table 1.
28d compressive strength, 28d flexural strength, 28d tensile strength: and (3) carrying out compression resistance, bending resistance and tensile resistance experiments on the sample according to the concrete physical and mechanical property test method standard (GB/T50081-2019). After the test sample is maintained in a standard curing room for 28d, each group of three samples is taken for testing, and the average value of the three samples is recorded as the compressive strength, the flexural strength and the tensile strength of the test sample for 28 d.
Impact energy at initial failure, impact energy at final failure: three cylindrical (150 mm diameter, 65mm height) test specimens were made and the experiments were performed after standard curing room curing for 28 d. In the experiment, a repetitive impact load was applied to the test specimen from a height of 457mm with a hammer ball having a diameter of 64mm and weighing 4.5 kg. The number of hammering times for which cracks first appeared was counted as N1The number of hammering for final destruction is recorded as N2. Impact energy at initial failure, according to equation Ui＝N1mgh calculation; impact energy at ultimate failure according to equation UU＝N2mgh. Wherein mg in the equation is the weight of the sample and h is the height of the free fall of the sample.
TABLE 1
From the above data, it can be seen that, compared with the method of comparative example 4 of the high strength, crack-resistant and impact-resistant concrete prepared by using the prior art, in the method of the present invention for preparing the high strength, crack-resistant and impact-resistant concrete of examples 1 to 7, the amount of cement used is reduced, economic cost is saved, and natural resources are protected at the same time by using industrial solid wastes such as copper slag and slag. The wet grinding treatment mode improves the pozzolanic activity of the copper slag and the slag to a greater extent, so that the impact-resistant concrete has higher compressive strength, flexural strength and tensile strength.
In addition, as can be seen from table 1, compared with example 5, the coarse aggregate without asphalt coating in comparative example 1 cannot effectively relieve and absorb huge energy and relieve stress concentration in the interface transition region, which also causes more cracks and reduces the impact resistance and crack resistance, and is particularly reflected in that the high-strength crack-resistant and impact-resistant concrete prepared in comparative example 1 has poorer compressive strength, impact resistance and crack resistance.
Compared with example 5, the fine aggregate in comparative example 2 does not contain rubber chips, which is not beneficial to absorbing impact energy, and causes the generation and the expansion of cracks in concrete, and the impact resistance is reduced, particularly the high-strength anti-cracking impact-resistant concrete prepared in comparative example 2 has poorer compression strength, impact resistance and crack resistance.
Compared with example 5, the non-amorphous metal fiber is not doped in comparative example 3, so that the bonding interface between the cementing material and the aggregate cannot be improved, the bending and tensile properties of the concrete cannot be improved better, and more micro cracks cannot be avoided, so that all the properties of the high-strength anti-cracking impact-resistant concrete prepared in comparative example 3 are not good.
Compared with example 5, comparative example 4, which does not use copper slag slurry (i.e., slurry a) and slag powder slurry (i.e., slurry B), cannot improve the bonding interface between the cement and the aggregate and improve the bending and tensile properties of the concrete, and cannot avoid the generation of more micro cracks, resulting in that all properties of the high-strength, crack-resistant and impact-resistant concrete prepared in comparative example 4 are not good.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. The preparation method of the high-strength anti-cracking impact-resistant concrete is characterized by comprising the following steps of:
(1) carrying out dry grinding on the copper slag and the slag to powder by using a roller dry grinding machine to respectively obtain copper slag powder and slag powder;
(2) taking 190-210 parts by weight of the copper slag powder and 85-105 parts by weight of water, adding 0.1-0.2 part by weight of a water reducing agent, wet-milling for 35-45min by using a vertical ball mill to obtain copper slag slurry, and recording the copper slag slurry as slurry A;
taking 100 plus 120 parts by weight of the slag powder and 100 plus 120 parts by weight of water, adding 0.1-0.3 part by weight of a water reducing agent, wet-grinding for 15-25min to obtain slag powder slurry, and recording the slag powder slurry as slurry B;
(3) cutting the waste rubber into rubber scraps by using a crusher;
(4) preparing asphalt coating coarse aggregate: preparing coal gangue coarse aggregate in advance; and then placing the asphalt in a steel basin and melting the asphalt by using a constant-temperature electromagnetic oven, when the temperature of the asphalt reaches 100-: asphalt coating coarse aggregate;
(5) mixing the slurry A10-20 parts by weight, the slurry B30-40 parts by weight and the cement 50-60 parts by weight obtained in the step (2) to obtain a cementing material;
mixing 20-60 parts by weight of the rubber crumbs prepared in the step (3) with 140-180 parts by weight of copper tailings to obtain fine aggregate;
pouring the cementing material into a stirrer, mixing and stirring for 30-60s, then adding 1-2 parts by weight of amorphous metal fibers, continuously stirring for 1-2min, finally pouring the fine aggregate, the coarse aggregate of the asphalt coating prepared in the step (4) of 280-320 parts by weight and 0.5-2 parts by weight of a water reducing agent, and uniformly stirring.
2. The method according to claim 1, wherein the copper slag and the slag in step (1) are produced industriallyThe color of the waste slag and the copper slag is gray black, and the specific surface area is 370-2Per kg; SiO in slag2And Al2O3The content of (B) is 25-35 wt% and 5-15 wt%, respectively.
3. The method according to claim 1, wherein the water reducing agent in the steps (2) and (5) is a mixed water reducing agent obtained by mixing a polycarboxylic acid and a naphthalene water reducing agent in a weight ratio of 1: 1.
4. The method as claimed in claim 1, wherein the rotation speed of the attritor mill in the step (2) is 350-450 r/s.
5. The method according to claim 1, wherein in the step (2), the median particle diameter of the copper slag in the copper slag slurry is 1.5 to 2.3 μm, and the median particle diameter of the slag in the slag powder slurry is 3 to 4 μm.
6. The method of claim 1, wherein in step (3), the rubber crumb has a particle size in the range of 1 to 4 mm.
7. The method according to claim 1, wherein in the step (4), the coal gangue coarse aggregate is prepared by mixing two graded coal gangues with the average particle size of 5-10mm and the average particle size of 10-16mm in a mass ratio of 4:6, the asphalt coating coarse aggregate needs to be cooled to room temperature in an isolated mode, and the thickness of the asphalt coating is 80-120 μm.
8. The method as claimed in claim 1, wherein in step (4), the rotation speed of the electric stirrer is 150-190 r/min.
9. The method as claimed in claim 1, wherein in the step (5), the amorphous metal fiber has an equivalent diameter of 0.2-0.3mm, an aspect ratio of 110-130, and a density of 7-7.5g/cm3。
10. High strength crack resistant impact resistant concrete obtainable by the method according to any one of claims 1 to 9.
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| CN202210078065.2A Pending CN114349407A (en) | 2022-01-24 | 2022-01-24 | Preparation method of high-strength anti-cracking and anti-impact concrete and high-strength anti-cracking and anti-impact concrete |
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Citations (3)
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| CN202416292U (en) * | 2011-10-20 | 2012-09-05 | 广东工业大学 | Impact-resistance steel fiber and rubber modified recycled concrete pile |
| CN110467399A (en) * | 2019-09-10 | 2019-11-19 | 江西科技学院 | A kind of self-compacting concrete and preparation method thereof using Copper Slag |
| CN112500097A (en) * | 2020-12-28 | 2021-03-16 | 湖北工业大学 | Self-repairing steel slag-slag concrete and preparation method thereof |
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| CN202416292U (en) * | 2011-10-20 | 2012-09-05 | 广东工业大学 | Impact-resistance steel fiber and rubber modified recycled concrete pile |
| CN110467399A (en) * | 2019-09-10 | 2019-11-19 | 江西科技学院 | A kind of self-compacting concrete and preparation method thereof using Copper Slag |
| CN112500097A (en) * | 2020-12-28 | 2021-03-16 | 湖北工业大学 | Self-repairing steel slag-slag concrete and preparation method thereof |
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Application publication date: 20220415 |