CN110590288A - High-strength concrete and preparation process thereof - Google Patents
High-strength concrete and preparation process thereof Download PDFInfo
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- CN110590288A CN110590288A CN201910970919.6A CN201910970919A CN110590288A CN 110590288 A CN110590288 A CN 110590288A CN 201910970919 A CN201910970919 A CN 201910970919A CN 110590288 A CN110590288 A CN 110590288A
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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Abstract
The invention discloses high-strength concrete and a preparation process thereof, relates to the technical field of concrete, and solves the problem that the overall structural strength of the concrete is greatly reduced because waste concrete particles with micro cracks on the surface of the concrete are easily damaged. The high-strength concrete comprises the following components in parts by weight: 180 portions of water and 220 portions of water; 400 portions of stone; 750 portions of medium sand and 850 portions of medium sand; 240 portions and 260 portions of Portland cement; 120-160 parts of recycled concrete aggregate; 70-100 parts of mineral powder; 40-60 parts of modified fly ash; 10-16 parts of nano filler; 20-40 parts of water glass; 2-5 parts of a water reducing agent; 15-25 parts of filling reinforcing material. When the high-strength concrete is subjected to a large external force, the internal structure of the high-strength concrete can still keep good integrity, and the high-strength concrete is not easy to damage and has high overall strength.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to high-strength concrete and a preparation process thereof.
Background
The concrete is cement concrete which is prepared by mixing cement as a cementing material, sand and stone as aggregates, water, an additive and an admixture according to a certain proportion and stirring, and is also called ordinary concrete, and is widely applied to civil engineering.
The invention discloses an environment-friendly antifreezing concrete and a preparation method thereof in a Chinese patent with the publication number of CN110117179A, wherein the environment-friendly antifreezing concrete comprises the following components in parts by weight: 260 parts of 240-containing cement, 200 parts of 180-containing water, 870 parts of 850-containing broken stone, 790 parts of 770-containing medium sand, 60-80 parts of mineral powder, 50-70 parts of fly ash, 4.36-10.36 parts of additive, 1.25-3.25 parts of antifreeze agent, 30-45 parts of waste concrete particles, 15-25 parts of waste rubber particles, 1.5-3.5 parts of water-based acrylate, 10-15 parts of epoxy resin and 8.6-10.6 parts of polyurethane particles; the antifreeze agent is prepared from the following components: polyethylene glycol, water, polydextrose, gelatin agar and guar gum.
In the above-mentioned application document, through mixing old and useless concrete granule and old and useless rubber granule, the influence of old and useless concrete and old rubber to alleviating the pollution has been alleviated, but there are a large amount of microcracks in the surface of old and useless concrete granule, lead to its and other each component raw materials interface bonding strength not good, and the old and useless concrete granule appears microcrack's part under the exogenic action, the phenomenon that stress concentration can appear, be destroyed easily, and then lead to the holistic structural strength greatly reduced of concrete, therefore, need provide a new scheme and solve above-mentioned problem.
Disclosure of Invention
Aiming at the problem that the overall structural strength of concrete is greatly reduced because waste concrete particles with micro cracks on the surface of the concrete are easily damaged in the prior art, the invention aims to provide the high-strength concrete to solve the technical problem that when the high-strength concrete is subjected to a large external force, the internal structure of the high-strength concrete still can keep good integrity, is not easy to damage and has high overall strength.
In order to achieve the first purpose, the invention provides the following technical scheme:
the high-strength concrete comprises the following components in parts by weight:
180 portions of water and 220 portions of water;
400 portions of stone;
750 portions of medium sand and 850 portions of medium sand;
240 portions and 260 portions of Portland cement;
120-160 parts of recycled concrete aggregate;
70-100 parts of mineral powder;
40-60 parts of modified fly ash;
10-16 parts of nano filler;
20-40 parts of water glass;
2-5 parts of a water reducing agent;
15-25 parts of filling reinforcing material.
By adopting the technical scheme, the mineral powder can effectively improve the compressive strength of the high-strength concrete, reduce the cost of the high-strength concrete, inhibit the reaction of alkali aggregate, reduce the hydration heat, reduce the early temperature cracks of the high-strength concrete structure, improve the compactness of the high-strength concrete and have obvious effects on improving the anti-seepage and anti-erosion capabilities. The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump constant of the retarded concrete basically. The filling reinforcing material not only has good structural strength, but also has good dispersibility in high-strength concrete, and has good compatibility with raw materials of each component, thereby greatly improving the overall performance of the high-strength concrete.
The recycled concrete aggregate is obtained by blasting, recycling, crushing and screening the concrete building, so that the dismantled concrete building can be recycled, a large amount of raw materials such as sand stones can be saved, the waste treatment and environmental protection are facilitated, and the economic benefit, the social benefit and the environmental benefit are remarkable. The modified fly ash can react with calcium hydroxide or other alkaline earth metal hydroxides to generate a compound with hydraulic gelation performance; the water glass can react with calcium hydroxide on the recycled concrete aggregate to generate hydraulic silicic acid colloid; the nano filler has good filling property; can ensure that the interior of the recycled concrete aggregate becomes more compact and has good filling effect on the microcracks on the surface of the recycled concrete aggregate. Meanwhile, the modified fly ash, the water glass and the nano filler can play a good role in compounding and synergism, so that when the high-strength concrete is subjected to a large external force, the internal structure of the high-strength concrete can still keep good integrity and stability, and the whole high strength can be kept.
Preferably, the recycled concrete aggregate mainly comprises fine materials with the particle size range of 2-6 mm and coarse materials with the particle size range of 6-12 mm, and the weight ratio of the fine materials to the coarse materials is 1: (1.2-1.5).
By adopting the technical scheme, compared with natural aggregate, the recycled concrete aggregate has the characteristics of large void ratio and strong water absorption, and the recycled concrete aggregate is formed by selecting the fine material with the particle size range of 2-6 mm and the coarse material with the particle size range of 6-12 mm, so that the recycled concrete aggregate has good bonding property with the raw materials of all components, and further the inside of the high-strength concrete has good compactness, the overall structural strength is higher, and the stability is good.
More preferably, the nano filler is a mixture of nano silica and nano calcium carbonate, and the weight part ratio of the nano silica to the nano calcium carbonate is 1: (1.8-2.6).
By adopting the technical scheme, the nano silicon dioxide can improve the structural strength and the chemical resistance of high-strength concrete, has good ultraviolet-resistant optical performance, and further ensures that gel compounds in the microcracks of the recycled concrete aggregate are not easy to age. The nano calcium carbonate has good toughening and reinforcing effects, and when the nano calcium carbonate and nano filler consisting of nano silicon dioxide are used, the nano calcium carbonate can fully act on the microcrack position of recycled concrete aggregate, so that high-strength concrete can keep good and stable structural strength.
More preferably, the water reducing agent is any one of sodium lignosulfonate, sodium sulfite, tannin and sugar calcium.
By adopting the technical scheme, the sodium lignosulfonate, the sodium sulfite, the tannin and the calcium saccharate are good water reducing agents, have good dispersing effect on raw materials of each component of the high-strength concrete, can reduce unit water consumption, improve the fluidity of the high-strength concrete, improve the compactness of the high-strength concrete, reduce the bleeding rate of the high-strength concrete and keep good stability of the high-strength concrete.
More preferably, the filling and reinforcing material is one or more of quartz powder, silicon carbide, silicon nitride, corundum powder, aluminum silicate fiber and glass fiber.
By adopting the technical scheme, the quartz powder, the silicon carbide, the silicon nitride, the corundum powder, the aluminum silicate fiber and the glass fiber are good reinforcing agents, have good dispersibility in the high-strength concrete, and have good bonding property with raw materials of all components, so that the overall structural strength of the high-strength concrete after curing and forming is greatly improved. Meanwhile, the reinforcing agent has good strength and filling property, so that the overall compactness and impact strength of the high-strength concrete are greatly improved.
The second purpose of the invention is to provide a preparation process of high-strength concrete, and the high-strength concrete prepared by the process can still keep good integrity of the internal structure when being subjected to a large external force, is not easy to damage and has high integral strength.
In order to achieve the second purpose, the invention provides the following technical scheme, which comprises the following steps:
step one, stirring and mixing stones, medium sand, modified fly ash, portland cement and mineral powder in corresponding parts by weight, and drying to obtain a mixture;
adding filling reinforcing materials and nano fillers in corresponding parts by weight into the mixture, and stirring and drying to obtain a base material;
step three, putting water, water glass and a water reducing agent in corresponding parts by weight into a stirring cylinder for stirring to obtain a mixed solution;
and step four, soaking the recycled concrete aggregate in the mixed solution, standing for a period of time, pouring the base material into the mixed solution for multiple times, and continuously stirring to obtain the high-strength concrete.
By adopting the technical scheme, the stones, the middlings, the fly ash, the Portland cement and the mineral powder are dried and stirred, so that the stones, the middlings, the fly ash, the Portland cement and the mineral powder are uniformly mixed, the high-strength concrete is prevented from being greatly reduced in quality due to the fact that parts of the stones, the middlings, the fly ash, the Portland cement and the mineral powder are bonded together, the filling reinforcing material and the nano filler are added and mixed, and the filling reinforcing material and the nano filler are fully. And soaking the recycled concrete aggregate in the mixed liquor for a period of time, so that the water glass is filled in the internal pores of the recycled concrete aggregate and fully plays a role. Meanwhile, the process for preparing the high-strength concrete is simple to operate, and the components can be quickly and uniformly mixed, so that the high-strength concrete has high production efficiency, and the overall quality can be guaranteed.
Further preferably, in the fourth step, the recycled concrete aggregate is pretreated, and the method specifically comprises the following steps:
step a, washing recycled concrete aggregate, drying and polishing the washed recycled concrete aggregate, and then sieving the washed recycled concrete aggregate to obtain an initial material;
and b, soaking the initial material in a sodium aluminosilicate solution with the concentration of 6-10% for 20-28h, taking out, washing with water, and soaking in a trimethylsilane solution with the concentration of 8-12% for 20-28h to obtain the pretreated recycled concrete aggregate.
Through adopting above-mentioned technical scheme, wash the recycled concrete aggregate, be favorable to getting rid of the impurity in the recycled concrete aggregate, dry again and polish, can get rid of the fragile component on recycled concrete aggregate surface, and then improve its bulk strength. The initial material is soaked by a sodium aluminosilicate solution, so that the generated product can fill pores and microcracks on the surface of the recycled concrete aggregate, and then the initial material is soaked by a trimethylsilane solution, so that a coating film layer can be formed on the surface of the recycled concrete aggregate to cover the microcracks on the surface of the recycled concrete aggregate, and the recycled concrete aggregate is more compact and complete. The recycled concrete aggregate is pretreated according to the steps, so that when the high-strength concrete is subjected to a large external force, the internal structure of the high-strength concrete still can keep good integrity and stability, and the whole high-strength concrete aggregate can keep high strength.
Further preferably, in the step one, the modified fly ash comprises the following modification steps:
s1, soaking the fly ash in absolute ethyl alcohol, performing ultrasonic treatment, performing high-speed centrifugation to obtain a lower-layer solid, and washing with distilled water to obtain a pure material;
s2, adding the pure material into a sodium hydroxide solution with the same mass, stirring for 10-14h, dropwise adding a dilute sulfuric acid solution with the mass fraction of 8-12% while stirring until the solution is neutral, performing vacuum filtration, ultrasonically cleaning for 2-3 times by using distilled water, and performing vacuum drying to obtain hydroxylated fly ash;
s3, mixing azobutyronitrile, acrylic acid, methyl allyl oxyethylene ether and toluene in a mass ratio of 1:5:60:250, and then condensing and refluxing for 4-6h at the temperature of 50-70 ℃ to obtain a polymerization solution;
s4, adding vinyltrimethoxysilane into the polymerization solution, stirring for 1-1.5h at 50-70 ℃, then raising the temperature to 80-90 ℃, adding hydroxylated fly ash, reacting for 3-4h, carrying out vacuum filtration, ultrasonically cleaning for 2-3 times by using distilled water, and carrying out vacuum drying to obtain the modified fly ash.
By adopting the technical scheme, the fly ash is modified by adopting the steps, firstly, the fly ash is washed by absolute ethyl alcohol, so that soluble organic and inorganic impurities in the fly ash can be removed, then, the surface of the fly ash is hydroxylated, the specific surface area of the fly ash is improved, the modified fly ash can chemically react with calcium hydroxide or other alkaline earth metal hydroxides to generate a compound with hydraulic gelation property, and when high-strength concrete is impacted, cracks and stress concentration are reduced, so that the high-strength concrete is not easy to damage.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the modified fly ash, the water glass and the nano filler are added, and the modified fly ash, the water glass and the nano filler can play a good compounding and synergistic effect mutually, so that when the high-strength concrete is subjected to a large external force, the internal structure of the high-strength concrete can still keep good integrity and stability, and the whole body can keep high strength;
(2) the initial material is soaked by the sodium aluminosilicate solution, so that generated products can fill pores and microcracks on the surface of the recycled concrete aggregate, and then the initial material is soaked by the trimethylsilane solution, so that a coating film layer can be formed on the surface of the recycled concrete aggregate to cover the microcracks on the surface of the recycled concrete aggregate, the recycled concrete aggregate is more compact and complete, and the high-strength concrete can keep good stability and higher structural strength.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: the high-strength concrete comprises the following components in parts by weight as shown in Table 1, and is prepared by the following steps:
step one, stirring and mixing the pebbles, the medium sand, the modified fly ash, the portland cement and the mineral powder in corresponding parts by weight in a drying barrel, and drying at the rotation speed of 500rpm for 30min at the temperature of 90 ℃ to obtain a mixture;
adding quartz powder and nano filler in corresponding parts by weight into the mixture, stirring and drying for 10min at a stirring speed of 500rpm to obtain a base material;
step three, putting water, water glass and sodium lignin sulfonate in corresponding parts by weight into a stirring cylinder for stirring for 10min at a stirring speed of 300rpm to obtain a mixed solution;
and step four, soaking the recycled concrete aggregate in the mixed solution, standing for 10min, pouring the base materials into the mixed solution for 3 times in equal mass, continuously stirring and mixing at the stirring speed of 800rpm for 10min, and obtaining the high-strength concrete.
Note: in the steps, the recycled concrete aggregate is mainly formed by mixing fine materials with the particle size range of 2-6 mm and coarse materials with the particle size range of 6-12 mm, and the weight ratio of the fine materials to the coarse materials is 1: 1.35; the nano filler is a mixture of nano silicon dioxide and nano calcium carbonate, and the weight part ratio of the nano silicon dioxide to the nano calcium carbonate is 1: 2.2; the modified fly ash comprises the following modification steps:
s1, soaking the fly ash in absolute ethyl alcohol, performing ultrasonic treatment, performing high-speed centrifugation to obtain a lower-layer solid, and washing with distilled water to obtain a pure material;
s2, adding the pure material into a sodium hydroxide solution with the same mass, stirring for 12h, dropwise adding a dilute sulfuric acid solution with the mass fraction of 10% while stirring, adding the solution to be neutral, carrying out vacuum filtration, ultrasonically cleaning for 3 times by using distilled water, and carrying out vacuum drying to obtain hydroxylated fly ash;
s3, mixing azobutyronitrile, acrylic acid, methyl allyl oxyethylene ether and toluene in a mass ratio of 1:5:60:250, and then condensing and refluxing for 5 hours at the temperature of 60 ℃ to obtain a polymerization solution;
s4, adding vinyl trimethoxy silane into the polymerization solution, stirring for 1.25h at the temperature of 60 ℃, then raising the temperature to 85 ℃, adding hydroxylated fly ash, reacting for 3.5h, carrying out vacuum filtration, ultrasonically cleaning for 3 times by using distilled water, and carrying out vacuum drying to obtain the modified fly ash.
Examples 2 to 8: a high-strength concrete is different from the concrete in example 1 in that the components and the corresponding parts by weight are shown in Table 1.
TABLE 1 Components and parts by weight of examples 1-8
Example 9: the high-strength concrete is different from the concrete in example 1 in that the modified fly ash comprises the following modification steps:
s1, soaking the fly ash in absolute ethyl alcohol, performing ultrasonic treatment, performing high-speed centrifugation to obtain a lower-layer solid, and washing with distilled water to obtain a pure material;
s2, adding the pure material into a sodium hydroxide solution with the same mass, stirring for 14h, then dropwise adding a dilute sulfuric acid solution with the mass fraction of 8%, stirring until the solution is neutral, carrying out vacuum filtration, ultrasonically cleaning for 2 times by using distilled water, and carrying out vacuum drying to obtain hydroxylated fly ash;
s3, mixing azobutyronitrile, acrylic acid, methyl allyl oxyethylene ether and toluene in a mass ratio of 1:5:60:250, and then condensing and refluxing for 4 hours at the temperature of 70 ℃ to obtain a polymerization solution;
s4, adding vinyltrimethoxysilane into the polymerization solution, stirring for 1 hour at the temperature of 70 ℃, then increasing the temperature to 80 ℃, adding hydroxylated fly ash, reacting for 4 hours, carrying out vacuum filtration, ultrasonically cleaning for 2 times by using distilled water, and carrying out vacuum drying to obtain the modified fly ash.
Example 10: the high-strength concrete is different from the concrete in example 1 in that the modified fly ash comprises the following modification steps:
s1, soaking the fly ash in absolute ethyl alcohol, performing ultrasonic treatment, performing high-speed centrifugation to obtain a lower-layer solid, and washing with distilled water to obtain a pure material;
s2, adding the pure material into a sodium hydroxide solution with the same mass, stirring for 10h, then dropwise adding a dilute sulfuric acid solution with the mass fraction of 12%, stirring until the solution is neutral, carrying out vacuum filtration, ultrasonically cleaning for 2 times by using distilled water, and carrying out vacuum drying to obtain hydroxylated fly ash;
s3, mixing azobutyronitrile, acrylic acid, methyl allyl oxyethylene ether and toluene in a mass ratio of 1:5:60:250, and then condensing and refluxing for 6 hours at the temperature of 50 ℃ to obtain a polymerization solution;
s4, adding vinyltrimethoxysilane into the polymerization solution, stirring for 1.5h at the temperature of 50 ℃, then increasing the temperature to 90 ℃, adding hydroxylated fly ash, reacting for 3h, carrying out vacuum filtration, ultrasonically cleaning for 3 times by using distilled water, and carrying out vacuum drying to obtain the modified fly ash.
Example 11: the high-strength concrete is different from the concrete in the embodiment 1 in that in the fourth step, the recycled concrete aggregate is mainly formed by mixing fine materials with the particle size range of 2-6 mm and coarse materials with the particle size range of 6-12 mm, and the weight part ratio of the fine materials to the coarse materials is 1: 1.2.
example 12: the high-strength concrete is different from the concrete in the embodiment 1 in that in the fourth step, the recycled concrete aggregate is mainly formed by mixing fine materials with the particle size range of 2-6 mm and coarse materials with the particle size range of 6-12 mm, and the weight part ratio of the fine materials to the coarse materials is 1: 1.5.
example 13: the difference between the high-strength concrete and the embodiment 1 is that in the second step, the nano filler is a mixture of nano silica and nano calcium carbonate, and the weight part ratio of the nano silica to the nano calcium carbonate is 1: 1.8.
example 14: the difference between the high-strength concrete and the embodiment 1 is that in the second step, the nano filler is a mixture of nano silica and nano calcium carbonate, and the weight part ratio of the nano silica to the nano calcium carbonate is 1: 2.6.
example 15: the high-strength concrete is different from the concrete in example 1 in that sodium lignosulfonate in the third step is replaced by sodium sulfite with equal mass.
Example 16: the high-strength concrete is different from the concrete in example 1 in that sodium lignosulfonate in the third step is replaced by tannin with equal mass.
Example 17: the high-strength concrete is different from the concrete in the embodiment 1 in that sodium lignosulfonate in the step three is replaced by equal-mass calcium saccharate.
Example 18: the difference between the high-strength concrete and the concrete in the embodiment 1 is that the quartz powder in the step two is replaced by silicon nitride with equal mass.
Example 19: the high-strength concrete is different from the concrete in the embodiment 1 in that the quartz powder in the step two is replaced by a mixture of silicon carbide and corundum powder with equal mass, and the mass ratio of the silicon carbide to the corundum powder is 2: 1.
Example 20: the high-strength concrete is different from the concrete in the embodiment 1 in that the quartz powder in the step two is replaced by a mixture of quartz powder, aluminum silicate fibers and glass fibers with equal mass, and the mass ratio of the quartz powder to the aluminum silicate fibers to the glass fibers is 2:1: 1.
Example 21: the high-strength concrete is different from the concrete in the embodiment 1 in that in the fourth step, the recycled concrete aggregate is pretreated, and the method specifically comprises the following steps:
step a, washing recycled concrete aggregate, drying and polishing the washed recycled concrete aggregate, and then sieving the washed recycled concrete aggregate to obtain an initial material;
and b, soaking the initial material in a sodium aluminosilicate solution with the concentration of 8% for 24 hours, taking out the initial material, washing the initial material with water, and soaking the initial material in a trimethylsilane solution with the concentration of 10% for 24 hours to obtain the pretreated recycled concrete aggregate.
Example 22: the high-strength concrete is different from the concrete in the embodiment 1 in that in the fourth step, the recycled concrete aggregate is pretreated, and the method specifically comprises the following steps:
step a, washing recycled concrete aggregate, drying and polishing the washed recycled concrete aggregate, and then sieving the washed recycled concrete aggregate to obtain an initial material;
and b, soaking the initial material in a sodium aluminosilicate solution with the concentration of 6% for 28 hours, taking out the initial material, washing the initial material with water, and soaking the initial material in a trimethylsilane solution with the concentration of 8% for 28 hours to obtain the pretreated recycled concrete aggregate.
Example 23: the high-strength concrete is different from the concrete in the embodiment 1 in that in the fourth step, the recycled concrete aggregate is pretreated, and the method specifically comprises the following steps:
step a, washing recycled concrete aggregate, drying and polishing the washed recycled concrete aggregate, and then sieving the washed recycled concrete aggregate to obtain an initial material;
and b, soaking the initial material in a sodium aluminosilicate solution with the concentration of 10% for 20 hours, taking out the initial material, washing the initial material with water, and soaking the initial material in a trimethylsilane solution with the concentration of 12% for 20 hours to obtain the pretreated recycled concrete aggregate.
Comparative example 1: the difference between the high-strength concrete and the embodiment 1 is that the step one is specifically set as that stones, medium sand, portland cement and mineral powder in corresponding weight parts are stirred and mixed in a drying barrel and are dried, the rotating speed is 500rpm, the time is 30min, and the temperature is controlled at 90 ℃ to obtain a mixture.
Comparative example 2: the difference between the high-strength concrete and the embodiment 1 is that the step two is specifically set as adding quartz powder in corresponding parts by weight into the mixture, stirring and drying for 10min at the stirring speed of 500rpm to obtain the base material.
Comparative example 3: the difference between the high-strength concrete and the embodiment 1 is that the step three is specifically set as that water and sodium lignin sulfonate in corresponding parts by weight are put into a stirring cylinder to be stirred for 10min at the stirring speed of 300rpm to obtain a mixed solution.
Comparative example 4: the high-strength concrete is different from the concrete in the embodiment 1 in that the high-strength concrete specifically comprises the following steps:
step one, stirring and mixing the stones, the middlings, the portland cement and the mineral powder in corresponding weight parts in a drying barrel, and drying at the rotation speed of 500rpm for 30min at the temperature of 90 ℃ to obtain a mixture;
adding quartz powder in corresponding parts by weight into the mixture, stirring and drying for 10min at a stirring speed of 500rpm to obtain a base material;
step three, putting water and sodium lignosulfonate in corresponding parts by weight into a stirring cylinder for stirring for 10min at a stirring speed of 300rpm to obtain a mixed solution;
and step four, soaking the recycled concrete aggregate in the mixed solution, standing for 10min, pouring the base materials into the mixed solution for 3 times in equal mass, continuously stirring and mixing at the stirring speed of 800rpm for 10min, and obtaining the high-strength concrete.
Performance testing
Test samples: the high-strength concrete obtained in examples 1 to 23 was used as test samples 1 to 23, and the high-strength concrete obtained in comparative examples 1 to 4 was used as control samples 1 to 4.
The test method comprises the following steps: making a standard concrete test block by using the test samples 1-23 and the control samples 1-4 according to the standard GB/T50081-2002, detecting the impact resistance of the standard concrete by adopting a drop hammer test method, wherein the steel drop hammer is 10Ib (4.54Kg) in weight and 63.5mm in diameter, freely dropping a steel hammer from the height of 500mm, impacting the standard concrete test block, recording the impact as a cycle when each impact is completed, and recording the cycle times when the standard concrete test block generates a first micro-crack from no crack.
And (3) test results: the test results of the test samples 1 to 23 and the control samples 1 to 4 are shown in Table 2. As can be seen from Table 2, the test results of the test samples 1-8 and the comparison samples 1-4 are compared to obtain the modified fly ash, the water glass and the nano filler, so that the modified fly ash, the water glass and the nano filler can have good compounding and synergistic effects, and the impact resistance of the high-strength concrete can be greatly improved. The comparison of the test results of the test samples 9-20 and the test sample 1 can obtain that the preparation method of the modified fly ash, the recycled concrete aggregate, the nano filler, the water reducing agent and the filling reinforcing material disclosed by the invention are all suitable for preparing high-strength concrete, and the high-strength concrete keeps good and stable impact resistance. The test results of the test samples 21 to 23 and the test sample 1 are compared to obtain the recycled concrete aggregate, and the impact resistance of the high-strength concrete can be greatly improved by pretreating the recycled concrete aggregate.
TABLE 2 test results of test samples 1-23 and control samples 1-4
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The high-strength concrete is characterized by comprising the following components in parts by weight:
180 portions of water and 220 portions of water;
400 portions of stone;
750 portions of medium sand and 850 portions of medium sand;
240 portions and 260 portions of Portland cement;
120-160 parts of recycled concrete aggregate;
70-100 parts of mineral powder;
40-60 parts of modified fly ash;
10-16 parts of nano filler;
20-40 parts of water glass;
2-5 parts of a water reducing agent;
15-25 parts of filling reinforcing material.
2. The high-strength concrete according to claim 1, wherein the recycled concrete aggregate mainly comprises fine materials with the particle size range of 2-6 mm and coarse materials with the particle size range of 6-12 mm, and the weight part ratio of the fine materials to the coarse materials is 1: (1.2-1.5).
3. The high-strength concrete according to claim 1, wherein the nano filler is a mixture of nano silica and nano calcium carbonate, and the weight ratio of the nano silica to the nano calcium carbonate is 1: (1.8-2.6).
4. The high-strength concrete according to claim 1, wherein the water reducing agent is any one of sodium lignosulfonate, sodium sulfite, tannin and calcium saccharate.
5. The high-strength concrete according to claim 1, wherein the filler-reinforcing material is selected from one or more of quartz powder, silicon carbide, silicon nitride, corundum powder, aluminum silicate fiber and glass fiber.
6. A process for preparing the high strength concrete according to claim 1, comprising the steps of:
step one, stirring and mixing stones, medium sand, modified fly ash, portland cement and mineral powder in corresponding parts by weight, and drying to obtain a mixture;
adding filling reinforcing materials and nano fillers in corresponding parts by weight into the mixture, and stirring and drying to obtain a base material;
step three, putting water, water glass and a water reducing agent in corresponding parts by weight into a stirring cylinder for stirring to obtain a mixed solution;
and step four, soaking the recycled concrete aggregate in the mixed solution, standing for a period of time, pouring the base material into the mixed solution for multiple times, and continuously stirring to obtain the high-strength concrete.
7. The process for preparing high-strength concrete according to claim 6, wherein in the fourth step, the recycled concrete aggregate is pretreated, and the process specifically comprises the following steps:
step a, washing recycled concrete aggregate, drying and polishing the washed recycled concrete aggregate, and then sieving the washed recycled concrete aggregate to obtain an initial material;
and b, soaking the initial material in a sodium aluminosilicate solution with the concentration of 6-10% for 20-28h, taking out, washing with water, and soaking in a trimethylsilane solution with the concentration of 8-12% for 20-28h to obtain the pretreated recycled concrete aggregate.
8. The process for preparing high-strength concrete according to claim 6, wherein in the first step, the modified fly ash comprises the following modification steps:
s1, soaking the fly ash in absolute ethyl alcohol, performing ultrasonic treatment, performing high-speed centrifugation to obtain a lower-layer solid, and washing with distilled water to obtain a pure material;
s2, adding the pure material into a sodium hydroxide solution with the same mass, stirring for 10-14h, dropwise adding a dilute sulfuric acid solution with the mass fraction of 8-12% while stirring until the solution is neutral, performing vacuum filtration, ultrasonically cleaning for 2-3 times by using distilled water, and performing vacuum drying to obtain hydroxylated fly ash;
s3, mixing azobutyronitrile, acrylic acid, methyl allyl oxyethylene ether and toluene in a mass ratio of 1:5:60:250, and then condensing and refluxing for 4-6h at the temperature of 50-70 ℃ to obtain a polymerization solution;
s4, adding vinyltrimethoxysilane into the polymerization solution, stirring for 1-1.5h at 50-70 ℃, then raising the temperature to 80-90 ℃, adding hydroxylated fly ash, reacting for 3-4h, carrying out vacuum filtration, ultrasonically cleaning for 2-3 times by using distilled water, and carrying out vacuum drying to obtain the modified fly ash.
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| CN111320438A (en) * | 2020-03-21 | 2020-06-23 | 上海石化安东混凝土有限公司 | Green environment-friendly concrete and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4018617A (en) * | 1976-02-02 | 1977-04-19 | Nicholson Realty Ltd. | Mixture for pavement bases and the like |
| CN104961368A (en) * | 2015-06-18 | 2015-10-07 | 合肥工业大学 | Technically simple method for modifying fly ash |
| CN107032687A (en) * | 2017-05-27 | 2017-08-11 | 绍兴职业技术学院 | One kind produces sponge city high-elastic mould pervious environment protection mortar and preparation method thereof using building waste |
| CN108164208A (en) * | 2017-11-30 | 2018-06-15 | 广东工业大学 | A kind of nano silicon dioxide regeneration concrete and preparation method thereof |
| CN109608152A (en) * | 2019-01-29 | 2019-04-12 | 杭州申华混凝土有限公司 | A kind of green strong concrete and its preparation process |
-
2019
- 2019-10-14 CN CN201910970919.6A patent/CN110590288A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4018617A (en) * | 1976-02-02 | 1977-04-19 | Nicholson Realty Ltd. | Mixture for pavement bases and the like |
| CN104961368A (en) * | 2015-06-18 | 2015-10-07 | 合肥工业大学 | Technically simple method for modifying fly ash |
| CN107032687A (en) * | 2017-05-27 | 2017-08-11 | 绍兴职业技术学院 | One kind produces sponge city high-elastic mould pervious environment protection mortar and preparation method thereof using building waste |
| CN108164208A (en) * | 2017-11-30 | 2018-06-15 | 广东工业大学 | A kind of nano silicon dioxide regeneration concrete and preparation method thereof |
| CN109608152A (en) * | 2019-01-29 | 2019-04-12 | 杭州申华混凝土有限公司 | A kind of green strong concrete and its preparation process |
Cited By (14)
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| CN111320438A (en) * | 2020-03-21 | 2020-06-23 | 上海石化安东混凝土有限公司 | Green environment-friendly concrete and preparation method thereof |
| CN111410489A (en) * | 2020-04-26 | 2020-07-14 | 上海兆捷实业发展有限公司 | High-strength self-compacting concrete and preparation method thereof |
| CN113816670B (en) * | 2020-06-18 | 2022-12-09 | 上海普厚景观设计有限公司 | High-strength concrete brick containing recycled aggregate and preparation method thereof |
| CN113816670A (en) * | 2020-06-18 | 2021-12-21 | 上海普厚景观设计有限公司 | High-strength concrete brick containing recycled aggregate and preparation method |
| CN112062521A (en) * | 2020-09-08 | 2020-12-11 | 天津市堃淏混凝土有限公司 | Large-volume concrete and preparation method thereof |
| CN112745075A (en) * | 2020-12-31 | 2021-05-04 | 南通友力混凝土有限公司 | Corrosion-resistant recycled concrete and production process thereof |
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| CN114477875B (en) * | 2022-02-28 | 2023-05-09 | 铭际建筑科技(泰兴)有限公司 | High-strength concrete and prefabricated road board prepared from same |
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