CN117756485A - Anti-disturbance concrete and preparation method thereof - Google Patents
Anti-disturbance concrete and preparation method thereof Download PDFInfo
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- CN117756485A CN117756485A CN202311756345.5A CN202311756345A CN117756485A CN 117756485 A CN117756485 A CN 117756485A CN 202311756345 A CN202311756345 A CN 202311756345A CN 117756485 A CN117756485 A CN 117756485A
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- 239000004567 concrete Substances 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000004568 cement Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000000654 additive Substances 0.000 claims abstract description 17
- 230000000996 additive effect Effects 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
- 239000011707 mineral Substances 0.000 claims abstract description 13
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 4
- 229910021487 silica fume Inorganic materials 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 239000011324 bead Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000007667 floating Methods 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000008030 superplasticizer Substances 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 230000008439 repair process Effects 0.000 abstract description 6
- 239000002253 acid Substances 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 239000003292 glue Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000004721 Polyphenylene oxide Substances 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000003469 silicate cement Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000009472 formulation Methods 0.000 description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric Acid Chemical group [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 229940044172 calcium formate Drugs 0.000 description 2
- 235000019255 calcium formate Nutrition 0.000 description 2
- 239000004281 calcium formate Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- -1 polysiloxane Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000011374 ultra-high-performance concrete Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 241001147416 Ursus maritimus Species 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses anti-disturbance concrete and a preparation method thereof, belonging to the technical field of traffic engineering repair, wherein the anti-disturbance concrete comprises the following components in parts by weight: 100 parts of re-doped cement, 20-25 parts of mineral admixture, 10-15 parts of fiber, 0.1-1 part of anti-disturbance additive, 1-5 parts of polycarboxylate water reducer, 100-160 parts of fine aggregate, 150-300 parts of coarse aggregate and 20-30 parts of water; wherein the weight part ratio of the coarse aggregate to the cement paste is (0.8-1.2): 1, a step of; the weight part ratio of the fine aggregate to the cementing material is 1: (0.8-1.2). The invention adopts reasonable glue sand ratio, adopts the polycarboxylic acid water reducer with high water reducing rate and high water retention, and combines different mineral admixtures with the disturbance-resistant additive for use, thereby solving the defects of low early strength, long initial setting and final setting time interval and the like of common concrete; the early disturbance resistance, crack resistance and durability of the concrete are greatly improved, the concrete can be constructed under the condition of open traffic, and the influence of bridge vibration caused by vehicle running on the performance of the concrete can be resisted.
Description
Technical Field
The invention belongs to the technical field of traffic engineering repair, and particularly relates to anti-disturbance concrete and a preparation method thereof.
Background
Along with the rapid development of the economy in China, the traffic volume and the automobile carrying capacity are continuously increased. Many highways and bridges are damaged in the use process, so that bridge diseases are serious, the current traffic requirements cannot be met, and timely reinforcement and transformation are urgently needed. To reduce the impact on traffic, closed traffic is generally not allowed during construction. Under the condition of open traffic, the vibration effect of the past running vehicle can influence the molding of cast-in-place concrete, the adhesion between the cast-in-place concrete and the reinforcing steel bars, the later mechanical properties and the like. How to reinforce and repair a concrete structure under the condition that traffic is not interrupted or the influence on the traffic is small is one of the problems which need to be solved urgently in the current traffic engineering. Therefore, research on a novel anti-traffic-disturbance concrete material has important significance in reinforcing and repairing concrete pavement and bridge deck under the condition of no traffic interruption.
At present, the existing anti-disturbance concrete mainly uses ordinary Portland cement as a cementing material, and a large amount of anti-disturbance additive is added to achieve the purpose of resisting traffic disturbance, so that the hardening speed of the material is low, the early strength is low, the final setting time is often more than 5 hours, and the probability of disturbance damage is inevitably increased. The traditional ultra-high performance concrete can meet the existing requirements, but the cost is high, so that more cost is required to be input for large-area repair engineering; the epoxy mortar has higher requirements on the construction process, and construction staff is required to use special tools and techniques to master certain construction skills, otherwise, engineering quality problems are easy to cause.
Disclosure of Invention
In view of the above, the invention starts from the actual situation that road and bridge disturbance is caused by driving load so as to damage the performance of the newly poured concrete, and prepares the disturbance-resistant concrete with high disturbance resistance, high early strength, reasonable initial setting and final setting time difference, high crack resistance and high durability by compounding the concrete with silicate cement and reasonably proportioning the doped admixture and fiber by utilizing the advantages of quick setting, quick hardening and high early strength of the sulphoaluminate cement, thereby meeting the construction requirements.
The invention is realized by the following technical scheme:
an anti-disturbance concrete comprises the following components in parts by weight: 100 parts of re-doped cement, 2-25 parts of mineral admixture, 10-15 parts of fiber, 0.1-1 part of anti-disturbance additive, 1-5 parts of polycarboxylate water reducer, 100-160 parts of fine aggregate, 150-300 parts of coarse aggregate and 20-30 parts of water; wherein the weight part ratio of the coarse aggregate to the cement paste is (0.8-1.2): 1, a step of; the weight part ratio of the fine aggregate to the cementing material is 1: (0.8-1.2).
Compared with the prior art, the invention has at least the following technical effects:
the invention limits the mixing amount of the coarse aggregate and the fine aggregate to a reasonable range by limiting the weight part ratio of the coarse aggregate to the cement paste and the fine aggregate to the cementing material in the concrete, reduces the porosity as much as possible, reduces the infiltration of external water and improves the early strength of the concrete.
The concrete has the advantages of reasonable initial setting and final setting time difference, high early strength, high crack resistance, high durability, self-repairing and the like, can resist damage to fresh and hardened concrete caused by coupling vibration due to driving load, further ensures construction under the condition of no traffic interruption, meets the requirements of half-width traffic sealing and quick traffic of the current construction engineering, improves the construction efficiency and ensures the engineering quality.
Further, the remixed cement is silicate cement and sulphoaluminate cement, and the remixed proportion of the silicate cement and the sulphoaluminate cement is (3-4.5): 1. the sulphoaluminate cement has high early compressive strength, but has poor toughness and wear resistance, and has a strength collapse in the later stage. The invention fully utilizes the advantages of quick setting, quick hardening and high early strength of the sulphoaluminate cement, and the compound cement is prepared by compound mixing with the silicate cement, so that the characteristics of a single material are changed, and the performance complementation is realized.
Further, the anti-disturbance additive comprises retarder, early strength agent and defoamer, and the mass percentages of the components are as follows: 10-15% of early strength agent, 45-55% of retarder and 30-35% of defoamer. The early strength agent is selected from sodium sulfate, calcium formate or lithium carbonate; lithium carbonate is preferred. The retarder is dihydroxysuccinic acid. The defoaming agent is one or more of organic silicon, polyether and polyether modified polysiloxane. The disturbance-resistant additive adopted by the invention is a special composite additive, so that the concrete has shorter initial and final setting time difference, higher early strength and low shrinkage rate.
Further, the strength grade of the Portland cement is not lower than 52.5, and the strength grade of the sulphoaluminate cement is not lower than 72.5.
Further, the mineral admixture is a mixture of silica fume and floating beads; the specific surface area of the silica fume is between 150000cm 2 /g-350000cm 2 /g; the particle size of the floating beads is 1-500 mu m. The silica fume has extremely strong pozzolanic activity, when the silica fume is doped into cement base material, the silica fume contacts with water, partial small particles are rapidly dissolved, and the solution is rich in SiO 2 And Ca-depleted gel forming an adhesion layer on the silica fume particle surface, and after a certain time, enriching SiO 2 And Ca (OH) which initiates dissolution of the Ca-depleted gel attachment layer and hydrates with the cement 2 The reaction produces C-S-H gel while reducing macropores (greater than 0.1 μm) and increasing micropores (less than 0.05 μm)m) to attenuate the pore size and also to attenuate Ca (OH) in the slurry 2 Reduced, refined crystals and weakened degree of orientation. Fine silica fume fills in the gaps between cement particles and also makes the slurry more compact. The floating beads are hollow glass beads with the density smaller than that of water in the fly ash, and the hollow glass beads are fine in granularity and large in specific surface area, can be directly used in use without grinding, can improve rheological property, reduce shrinkage deformation and improve durability.
Further, the coarse aggregate has a bulk density of 1540kg/m 3 The above, the close packing density was 1690kg/m 3 The coarse aggregate and the fine aggregate are combined, so that the porosity of the concrete is reduced, the compactness is improved, and the initial strength of the concrete is ensured to reach the standard.
Further, the fine aggregate is quartz sand, and the particle size of the quartz sand is 16-70 meshes.
Further, the coarse aggregate is crushed stone, and the particle size of the crushed stone is not more than 20mm.
Further, the fiber is a steel fiber with a monofilament diameter of 0.2mm, a length of 13.5mm and a tensile strength of 2850 MPa.
The invention also provides a preparation method of the anti-disturbance concrete, which comprises the following steps:
s1: weighing the compound cement, the mineral admixture, the anti-disturbance additive, the polycarboxylate superplasticizer, the fine aggregate, the coarse aggregate, the fiber and the water according to the weight parts;
s2: placing the fine aggregate, the compound cement, the mineral admixture, the polycarboxylate superplasticizer, the anti-disturbance additive and the crushed stone into a stirrer to be dry-mixed for 3min, and then pouring water into the stirrer to be stirred for 2-4min;
s3: and finally pouring the fiber, and stirring for 1min to prepare the anti-disturbance concrete.
The invention has the following technical effects:
the concrete prepared by the method has short disturbance period, is tested under the condition of simulating actual disturbance in a laboratory, does not have layering segregation phenomenon after disturbance, has no crack on the surface of the concrete, has the compressive strength of more than 25MPa for 3 hours, can solve the problems of long initial setting and final setting time difference, low early strength and easiness in cracking under the condition of disturbance of the traditional repairing and reinforcing concrete, and has excellent disturbance resistance.
The invention can produce synergistic effect between the components by selecting the addition amounts of the components such as cement, sand, silica fume, fiber, water reducing agent and the like, has smaller particle size and higher activity, can promote the hydration reaction of the cement, can fill the pores, reduce the porosity and improve the compactness of the concrete.
The invention selects the industrial wastes such as the large-doping amount floating beads as the cementing material, and has the advantages of low energy consumption and low carbon emission.
The invention provides a preparation method of anti-disturbance concrete, which solves the problem of uneven fiber dispersion in the stirring process.
The invention adopts the anti-disturbance concrete for carrying out traffic repair and reinforcement under the condition of no traffic interruption, which is not only an innovation of concrete technology, but also can generate great economic benefit and good social benefit.
Detailed Description
The invention is further illustrated below with reference to examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention.
The experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are readily available unless otherwise specified.
The following materials were used for the anti-disturbance concrete in the examples:
portland cement: portland cement with a strength grade of 52.5 produced by the Zhujiang cement plant.
Sulphoaluminate cement: sulphoaluminate cement with the strength grade of 72.5 is produced by the polar bear building material factory in Tangshan.
And (3) fibers: the length of the fiber is 13.5mm, the diameter is 0.2mm, and the tensile strength is 2850 MPa.
Mineral admixture: silica fume and floating bead mixture; the specific surface area of the silica fume is 150000cm 2 /g-350000cm 2 And/g, the particle size of the floating beads is 1-500 mu m.
Coarse aggregate: the maximum grain diameter of the crushed stone or pebble is 15mm, and the crushed stone is continuously graded by 3-15 mm; the loose bulk density of the coarse aggregate is controlled to 1540kg/m 3 The above, the close packing density was controlled to 1690kg/m 3 。
Fine aggregate: the particle size of the quartz sand is divided into three types: 16-26 mesh, 26-40 mesh and 40-70 mesh.
The disturbance-resistant additive is powder prepared by mixing 14% of early strength agent, 51% of retarder and 35% of defoamer, wherein the early strength agent is selected from sodium sulfate, calcium formate or lithium carbonate; the retarder is dihydroxysuccinic acid; the preparation method of the defoamer which selects one or more of organosilicon, polyether and polyether modified polysiloxane as the anti-disturbance additive comprises the following steps: according to the mass percentage of each component, each raw material is added into a stirrer, retarder is added after being dissolved in water, and the anti-disturbance concrete admixture is obtained after uniform mixing.
The anti-disturbance concrete raw materials of examples 1-5 were formulated according to the following table of formulations selected to meet the specifications:
table 1 anti-disturbance concrete formulation (unit is weight portion)
| Raw materials | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Portland cement | 80 | 80 | 80 | 80 | 80 |
| Sulphoaluminate cement | 20 | 20 | 20 | 20 | 20 |
| Floating bead | 17.5 | 17.5 | 17.5 | 17.5 | 17.5 |
| Silica fume | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 |
| Disturbance-resistant additive | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 |
| Polycarboxylate water reducer | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
| Steel fiber | 11 | 11 | 11 | 11 | 11 |
| Quartz sand | 102 | 123 | 102 | 123 | 102 |
| Broken stone | 236 | 205 | 283 | 257 | 0 |
| Water and its preparation method | 20.9 | 20.9 | 22.1 | 22.1 | 20.9 |
| Slurry ratio | 1:1 | 0.8:1 | 1.2:1 | 1:1 | —— |
| Rubber sand ratio | 1.2:1 | 1:1 | 1.2:1 | 1:1 | 1.2:1 |
| Ratio of water to gel | 0.17 | 0.17 | 0.18 | 0.18 | 0.17 |
Weighing the raw materials according to the formula proportion of the table 1, putting the coarse aggregate, the fine aggregate, the cementing material and the polycarboxylate water reducer into a stirrer, dry-mixing for 3min, adding the anti-disturbance additive, stirring for 2-4min, finally adding the steel fiber, and stirring for 1min to form the uniform anti-disturbance concrete mixture.
The anti-disturbance concrete mixture prepared in the examples 1-4 is prepared into concrete test blocks with specification and model number of 100mm multiplied by 100mm, the performance of the concrete test blocks in the examples 1-4 is detected, the detection test method is according to the concrete physical and mechanical performance test method standard GB/T50081-2019, and the detection results are shown in the following table 2;
table 2 results of anti-disturbance concrete Performance test under different formulations of examples 1-4
From the above, the initial setting time of the anti-disturbance concrete is controlled to be 17-20min and the final setting time is controlled to be 30-35min in the proportion of the table 1, so that the probability of disturbance of the concrete is reduced; the test piece has excellent early-stage and later-stage strength performance, and the compressive strength of the test piece after being disturbed for 3 hours can reach 24.5MPa, thereby meeting the technical requirements of quick repair and traffic.
The performance test results show that the mixing proportion parameters of the anti-disturbance concrete of the machine are optimized by using different slurry ratios and selecting the mixing amounts of the proper water reducer and the anti-disturbance agent, and the prepared bridge deck anti-disturbance concrete has shorter initial and final setting time differences and higher early mechanical properties. Under the condition of no traffic interruption, the concrete can completely meet the requirement of traffic disturbance resistance after being poured.
In addition, the concrete mortar test pieces prepared in example 5 were subjected to a breaking strength test, and the test results are shown in table 3 below.
TABLE 3 results of Performance test of example 5
As can be seen from the data in the above Table 3, the compressive strength of the mortar test block prepared in example 5 reaches 99MPa 28 days after 3h breaking, and reaches 80% of the original 28d compressive strength, and the 28d compressive strength after 3h breaking has 42% of the original strength; the compressive strength of 28d after 6h breaking reaches 74.0MPa and reaches 59% of the original compressive strength of 28d, but the flexural strength of 28d after 6h breaking is increased to 65%. The result shows that the self-repairing effect of the mortar after 3h breaking is better than that after 6h breaking in the aspect of compressive strength; in terms of breaking strength, the self-repairing effect of the mortar after 3h breaking is better than that after 6h breaking. The reason is that a large amount of unhydrated silicate minerals and sulphoaluminate minerals exist in the active material, so that the high strength in the later period of self-repairing is ensured, and under the condition that the crack width of a mortar strip is 0.5mm, external water permeates, so that the minerals on the surface of the crack continue to be hydrated, and the good self-repairing is shown.
In summary, the ultra-high performance concrete material added with the coarse aggregate has the advantages of reasonable initial setting and final setting time difference, high early strength, high crack resistance, high durability, self-repairing property and the like, can resist damage to fresh and hardened concrete caused by coupling vibration of travelling loads, further ensures construction under the condition of no traffic interruption, meets the requirements of semi-width traffic semi-width sealing and quick traffic, improves construction efficiency, ensures engineering quality and has important significance.
The above description is only a few examples of the present invention and is not intended to limit the embodiments and the protection scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious changes made by the content of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The anti-disturbance concrete is characterized by comprising the following components in parts by weight: 100 parts of re-doped cement, 20-25 parts of mineral admixture, 10-15 parts of fiber, 0.1-1 part of anti-disturbance additive, 1-5 parts of polycarboxylate water reducer, 100-160 parts of fine aggregate, 150-300 parts of coarse aggregate and 20-30 parts of water; wherein the weight part ratio of the coarse aggregate to the cement paste is (0.8-1.2): 1, a step of; the weight part ratio of the fine aggregate to the cementing material is 1: (0.8-1.2).
2. An anti-disturbance concrete according to claim 1, wherein the remixed cement is portland cement and sulfoaluminate cement, and the remixed proportion of the portland cement and the sulfoaluminate cement is (3-4.5): 1.
3. the anti-disturbance concrete according to claim 1, wherein the anti-disturbance additive comprises retarder, early strength agent and defoamer, and the mass percentages of the components are as follows: 10-15% of early strength agent, 45-55% of retarder and 30-35% of defoamer.
4. An anti-disturbance concrete according to claim 2, wherein the Portland cement strength grade is not less than 52.5 and the sulphoaluminate cement strength grade is not less than 72.5.
5. An anti-disturbance concrete according to claim 1, wherein the mineral admixture is a mixture of silica fume and floating beads; the specific surface area of the silica fume is between 150000cm 2 /g-350000cm 2 /g; the particle size of the floating beads is 1-500 mu m.
6. An anti-disturbance concrete according to claim 1, wherein the coarse aggregate has a loose bulk density of 1540kg/m 3 The above, the close packing density was 1690kg/m 3 The above.
7. An anti-disturbance concrete according to claim 1, wherein the fine aggregate is silica sand having a particle size of 16-70 mesh.
8. An anti-tamper concrete according to claim 6, wherein said coarse aggregate is crushed stone having a particle size of not more than 20mm.
9. An anti-disturbance concrete according to claim 1, wherein the fibers are steel fibers with a monofilament diameter of 0.2mm, a length of 13.5mm and a tensile strength of 2850 MPa.
10. A method for preparing an anti-disturbance concrete according to any one of claims 1 to 9, comprising the steps of:
s1: weighing the compound cement, the mineral admixture, the anti-disturbance additive, the polycarboxylate superplasticizer, the fine aggregate, the coarse aggregate, the fiber and the water according to the weight parts;
s2: placing the fine aggregate, the compound cement, the mineral admixture, the polycarboxylate superplasticizer, the anti-disturbance additive and the crushed stone into a stirrer to be dry-mixed for 3min, and then pouring water into the stirrer to be stirred for 2-4min;
s3: and finally pouring the fiber, and stirring for 1min to prepare the anti-disturbance concrete.
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| CN202311756345.5A CN117756485A (en) | 2023-12-20 | 2023-12-20 | Anti-disturbance concrete and preparation method thereof |
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| CN202311756345.5A CN117756485A (en) | 2023-12-20 | 2023-12-20 | Anti-disturbance concrete and preparation method thereof |
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| CN117756485A true CN117756485A (en) | 2024-03-26 |
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