CN112939540B - Preparation process of high-strength concrete - Google Patents
Preparation process of high-strength concrete Download PDFInfo
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- CN112939540B CN112939540B CN202110319547.8A CN202110319547A CN112939540B CN 112939540 B CN112939540 B CN 112939540B CN 202110319547 A CN202110319547 A CN 202110319547A CN 112939540 B CN112939540 B CN 112939540B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000004567 concrete Substances 0.000 claims abstract description 74
- 239000000654 additive Substances 0.000 claims abstract description 51
- 230000000996 additive effect Effects 0.000 claims abstract description 48
- 238000004146 energy storage Methods 0.000 claims abstract description 48
- 239000000835 fiber Substances 0.000 claims abstract description 36
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 35
- 238000005338 heat storage Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- -1 polypropylene Polymers 0.000 claims abstract description 19
- 239000004743 Polypropylene Substances 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 229920001155 polypropylene Polymers 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 11
- 239000004575 stone Substances 0.000 claims abstract description 9
- 238000005303 weighing Methods 0.000 claims abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 46
- 239000002202 Polyethylene glycol Substances 0.000 claims description 45
- 229920001223 polyethylene glycol Polymers 0.000 claims description 45
- 239000000243 solution Substances 0.000 claims description 43
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 40
- 239000000377 silicon dioxide Substances 0.000 claims description 40
- 235000012239 silicon dioxide Nutrition 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 27
- 229910021389 graphene Inorganic materials 0.000 claims description 27
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical group C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 24
- 239000007864 aqueous solution Substances 0.000 claims description 23
- 238000004321 preservation Methods 0.000 claims description 23
- 238000001723 curing Methods 0.000 claims description 21
- 230000002378 acidificating effect Effects 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000003999 initiator Substances 0.000 claims description 18
- 239000000178 monomer Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 16
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 16
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000005543 nano-size silicon particle Substances 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 9
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000007605 air drying Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 229920001030 Polyethylene Glycol 4000 Polymers 0.000 claims description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical group CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The application relates to the technical field of concrete processing, and particularly discloses a preparation process of high-strength concrete, which comprises the following steps: s1, weighing the following raw materials: cement, sand, stones, silica fume, fly ash, water, a water reducing agent, an energy storage and heat storage additive, steel fibers and polypropylene fibers; s2, under the condition of continuous stirring, uniformly mixing cement, sand, stones, silica fume, fly ash and an energy storage and heat storage additive, then adding water and a water reducing agent, uniformly mixing, and then adding steel fibers and polypropylene fibers, and uniformly mixing to obtain a concrete mixture; and S3, pouring and curing the concrete mixture to obtain the concrete. The preparation process of the high-strength concrete enables the concrete to show good compressive strength and flexural strength, also reduces the condition of concrete cracks, improves the crack resistance and frost resistance of the concrete, enables the concrete to show good comprehensive performance, and has good application prospect.
Description
Technical Field
The application relates to the technical field of concrete processing, in particular to a preparation process of high-strength concrete.
Background
Concrete is one of the most important civil engineering materials in the present generation and is widely used in human life. The concrete is prepared by a mixture prepared from a cementing material, granular aggregates, water and a water reducing agent according to a certain proportion, and then pouring and curing.
In the curing process of the concrete mixture, a large amount of heat can be emitted by hydration of cement in the concrete, the heat can not be rapidly emitted, the temperature inside the concrete mixture is increased, at the moment, a certain temperature difference is formed between the inside and outside temperature of the concrete mixture, so that temperature stress is generated, the cracking and crack width of the concrete are directly influenced, particularly, the cracks are the main damage modes of the large-volume concrete, and the comprehensive performance of the concrete structure is damaged.
Disclosure of Invention
In order to reduce the influence of temperature difference in concrete mixture curing on the performance of concrete, the application provides a preparation process of high-strength concrete.
The application provides a preparation process of high-strength concrete, which adopts the following technical scheme:
a preparation process of high-strength concrete comprises the following steps:
s1, weighing the following raw materials in parts by weight:
510 parts of cement 465-sand, 725 parts of sand 625-sand, 1120 parts of stone 1020-sand, 23-27 parts of silica fume, 55-70 parts of fly ash, 157 parts of water 129-sand, 7.9-9.4 parts of water reducing agent, 7.6-9.1 parts of energy storage and heat storage additive, 22-30 parts of steel fiber and 11-16 parts of polypropylene fiber;
s2, under the condition of continuous stirring, uniformly mixing cement, sand, stones, silica fume, fly ash and an energy storage and heat storage additive, then adding water and a water reducing agent, uniformly mixing, and then adding steel fibers and polypropylene fibers, and uniformly mixing to obtain a concrete mixture;
s3, pouring and curing the concrete mixture to obtain concrete;
the heat energy storage additive is graphene oxide coated silicon dioxide modified polystyrene-acrylonitrile grafted polyethylene glycol.
By adopting the technical scheme, the concrete obtained by the preparation process of the high-strength concrete has high compressive strength, breaking strength and impermeability grade, wherein the compressive strength is 51.2-54.5MPa, the breaking strength is 8.1-8.9MPa, the impermeability grade is S10, and meanwhile, after the freeze-thaw cycle is carried out for 200 times, the surface of the concrete has no cracks, so that the concrete has good crack resistance and frost resistance.
The polyethylene glycol has a regular molecular chain structure, a lower phase-change temperature and a wider temperature selection range, and is a solid-liquid phase-change material. Polyethylene glycol is grafted to polystyrene-acrylonitrile by chemical bonds, and even though the polyethylene glycol is in a liquid state due to phase transition, the polyethylene glycol is not sufficiently separated from the polystyrene-acrylonitrile, so that the polyethylene glycol loses macroscopic fluidity and shows solid-solid phase transition performance. The polystyrene-acrylonitrile grafted polyethylene glycol is modified by the silicon dioxide, and the silicon dioxide modified polystyrene-acrylonitrile grafted polyethylene glycol is coated by the graphene oxide, so that the heat transfer efficiency of the heat energy storage additive can be improved, the strength of the heat energy storage additive can be improved, and the performance of the heat energy storage additive can be improved.
In this application, add heat energy storage additive in the raw materials of concrete, in concrete mixture maintenance process, a large amount of heats that cement hydration gived off are absorbed by heat energy storage additive, and reduce the inside and outside difference in temperature of concrete mixture, reduce temperature stress, and simultaneously, add steel fiber in the raw materials of concrete, polypropylene fiber, crack resistance and tensile strength that not only can effectual improvement concrete, and can also increase the heat conductivity of concrete, through heat energy storage additive, steel fiber, synergistic effect between the polypropylene fiber, not only make the concrete show good compressive strength, but also reduce the condition that the concrete produces the crack, improve the comprehensive properties of concrete, good application prospect has.
Optionally, the energy storage and heat storage additive is prepared by the following method:
s11, under the conditions of inert gas protection and continuous stirring, adding a propylene monomer and an acrylonitrile monomer into the modified nano-silica, uniformly mixing, then adding an initiator, heating to 80-90 ℃, carrying out heat preservation treatment for 20-24h, and cooling to room temperature to obtain silica modified polystyrene-acrylonitrile;
s12, adding the silicon dioxide modified polystyrene-acrylonitrile into the acidic aqueous solution under the condition of continuous stirring, uniformly mixing, heating to 75-85 ℃, carrying out heat preservation treatment for 8-10h, and cooling to room temperature to obtain a mixture;
s13, under the condition of continuous stirring, adding sodium hydroxide into the mixture, adjusting the pH value to 8-9, then adding nano graphene oxide, uniformly mixing, heating to 60-70 ℃, carrying out heat preservation treatment for 4-5h, then adding polyethylene glycol, uniformly mixing, continuing to carry out heat preservation treatment for 12-15h, cooling to room temperature, carrying out centrifugal separation, and carrying out air drying to obtain an energy storage and heat storage additive;
wherein the weight ratio of the styrene monomer to the acrylonitrile monomer to the polyethylene glycol to the modified silicon dioxide to the nano graphene oxide is (3-4) to (1-2) to (8-10) to (2-3) to (1-2).
By adopting the technical scheme, the propylene monomer and the acrylonitrile monomer enter the modified nano-silica, the initiator is utilized to react double bonds between the propylene monomer and the acrylonitrile monomer, and simultaneously, the double bonds on the surface of the modified nano-silica react with the monomer, and the modification of the polystyrene-acrylonitrile by the silica is realized. And then hydrolyzing the silicon dioxide modified polystyrene-acrylonitrile in an acidic medium, adding nano graphene oxide and polyethylene glycol, carrying out esterification reaction between the raw materials, forming a cross-linked network, grafting the polyethylene glycol onto the silicon dioxide modified polystyrene-acrylonitrile, and coating the nano graphene oxide on the surface to obtain the energy storage and heat storage additive.
Optionally, the addition amount of the initiator is 1.5-2.5% of the total weight of the propylene monomer and the acrylonitrile monomer.
By adopting the technical scheme, the addition amount of the initiator is limited, the influence on the initial reaction rate caused by too small addition amount of the initiator is avoided, and the cost increase caused by too much addition amount of the initiator is also avoided.
Optionally, the initiator is ammonium persulfate.
By adopting the technical scheme, the ammonium persulfate can initiate the reaction of the propylene monomer and the acrylonitrile monomer through the free radical, and the initial reaction rate is increased.
Optionally, the weight ratio of the styrene monomer to the acidic aqueous solution is (3-4) to (60-70).
By adopting the technical scheme, the proportion of the styrene monomer and the acidic aqueous solution is limited, so that the silicon dioxide modified polystyrene-acrylonitrile is in the acidic aqueous solution, and the hydrolysis of the silicon dioxide modified polystyrene-acrylonitrile is realized.
Optionally, the acidic aqueous solution is a mixture of a hydrochloric acid solution and a sulfuric acid solution, the weight ratio of the hydrochloric acid solution to the sulfuric acid solution is 1:1, the mass concentration of the hydrochloric acid solution is 8-11%, and the mass solubility of the sulfuric acid solution is 22-25%.
By adopting the technical scheme, the hydrochloric acid solution has certain volatility and low concentration, and the concentration of hydrogen ions is limited. Although the sulfuric acid solution is not volatile, the sulfuric acid solution has certain oxidizability, and the oxidizability of the sulfuric acid solution is continuously increased along with the increase of the mass concentration of the sulfuric acid solution. The hydrochloric acid solution and the sulfuric acid solution are mixed to obtain the acidic aqueous solution, so that the acidic aqueous solution has high hydrogen ion concentration and low oxidability, and the stability of the preparation of the energy storage and heat storage additive is improved.
Optionally, the modified nano-silica is silane coupling agent modified nano-silica.
By adopting the technical scheme, the modified nano silicon dioxide is limited, so that the surface of the nano silicon dioxide is coated with the silane coupling agent, the surface of the modified nano silicon dioxide is rich in double bonds, the bonding strength of the silicon dioxide and the polystyrene-acrylonitrile is increased, and the performance of the energy storage and heat storage additive is improved.
Optionally, the polyethylene glycol is PEG 4000.
By adopting the technical scheme, when the average molecular weight of the polyethylene glycol is too small, the polyethylene glycol grafted to the polystyrene-acrylonitrile is greatly influenced by the polystyrene-acrylonitrile and influences the phase change enthalpy value of the polyethylene glycol, when the average molecular weight of the polyethylene glycol is too large, the grafting rate of the polyethylene glycol is influenced, and the performance of the energy storage and heat storage additive is improved by limiting the molecular weight of the polyethylene glycol.
Optionally, the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
By adopting the technical scheme, the use effect of the water reducing agent is improved, and the performance of concrete is further improved.
Optionally, in step S3, the following method is used for curing: firstly, under the conditions of temperature of 20-30 ℃ and humidity of 80-90%, the curing time is 7-10d, and then under the conditions of room temperature and humidity of 50-60%, the curing time is at least 21 d.
By adopting the technical scheme, the curing condition of the concrete mixture is limited, so that the concrete mixture is cured conveniently and forms concrete.
In summary, the present application has the following beneficial effects:
1. according to the preparation process of the high-strength concrete, the heat energy storage additive is added into the raw materials, the polystyrene-acrylonitrile grafted polyethylene glycol is modified by utilizing the graphene oxide and the modified silicon dioxide, and the synergistic effect of the graphene oxide and the modified silicon dioxide with the steel fibers and the polypropylene fibers is combined, so that the concrete not only shows good compressive strength and breaking strength, but also reduces the condition that the concrete cracks, improves the crack resistance and frost resistance of the concrete, shows good comprehensive performance, and has a good application prospect.
2. In the preparation of the energy storage and heat storage additive, modified nano silicon dioxide, a propylene monomer and an acrylonitrile monomer are mixed and react to obtain silicon dioxide modified polystyrene-acrylonitrile, then the silicon dioxide modified polystyrene-acrylonitrile is hydrolyzed in an acidic aqueous solution, and then the silicon dioxide modified polystyrene-acrylonitrile is mixed with nano graphene oxide and polyethylene glycol and reacts to obtain the graphene oxide coated silicon dioxide modified polystyrene-acrylonitrile grafted polyethylene glycol, so that the heat transfer efficiency of the heat energy storage additive can be improved, the strength of the heat energy storage additive can be improved, and the performance of the heat energy storage additive can be improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Raw materials
The styrene monomer, the acrylonitrile monomer, the polyethylene glycol, the modified silicon dioxide and the nano graphene oxide in the preparation examples are the same in type, and the additives are as follows: the styrene monomer and the acrylonitrile monomer are selected from Shandongfeng chemical company; polyethylene glycol is PEG4000 and is selected from the group consisting of Shanghai Peng Biotech, Inc.; the modified nano silicon dioxide is silane coupling agent modified nano silicon dioxide which is gamma-methacryloxypropyl trimethoxy silane modified nano silicon dioxide and is selected from Hangzhou Jikang New Material Co., Ltd; the nano graphene oxide is selected from Zhejiang Asia-Mei nano technology Co.
The types of cement, sand, gravel, silica fume, fly ash, water, a water reducing agent, steel fiber and polypropylene fiber in the examples and the comparative examples are the same, and except the specific indication in the examples, the additives are respectively as follows: the cement is PO42.5 portland cement and is selected from Shanai cement Co., Ltd; the sand is sand in the zone II and is selected from Shijiazhuangyi building materials Co.Ltd; the pebble is a 5-25mm continuous graded pebble and is selected from Beijing Weike metallurgy, Inc.; the silica fume is selected from Shandong Hengfu nonmetallic materials, Inc.; the fly ash class F class II fly ash is selected from the company of power generation Limited liability on inner Mongolia; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent which is a YD-A1 type polycarboxylic acid high-performance water reducing agent and is selected from Yida building materials Co., Ltd of Beijing Oriental; the steel fiber has a length of 5mm and a diameter of 0.1mm, and is selected from Guangdong McIII building materials Co; the polypropylene fiber has a length of 10mm and a diameter of 0.2mm and is selected from Shandongtongwenwei New building materials Co.
Preparation example
Preparation example 1
An energy storage and heat storage additive is prepared by the following method:
s11, under the conditions of nitrogen protection and continuous stirring, adding an acrylonitrile monomer and a propylene monomer into the modified nano-silica, uniformly mixing, then adding an initiator which is ammonium persulfate, heating to 80 ℃, carrying out heat preservation treatment for 24 hours, and cooling to room temperature to obtain the silica modified polystyrene-acrylonitrile.
Wherein the weight ratio of the styrene monomer to the acrylonitrile monomer to the modified nano silicon dioxide is 3:1: 2.
The addition amount of the initiator is 1.5 percent of the total weight of the propylene monomer and the acrylonitrile monomer.
S12, adding the silicon dioxide modified polystyrene-acrylonitrile into the acidic aqueous solution under the condition of continuous stirring, uniformly mixing, heating to 75 ℃, carrying out heat preservation treatment for 10 hours, and cooling to room temperature to obtain a mixture.
The acid aqueous solution is a mixture of a hydrochloric acid solution and a sulfuric acid solution, the weight ratio of the hydrochloric acid solution to the sulfuric acid solution is 1:1, the mass concentration of the hydrochloric acid solution is 11%, and the mass solubility of the sulfuric acid solution is 11%.
The weight ratio of the styrene monomer to the acidic aqueous solution is 3: 60.
S13, under the condition of continuously stirring, adding sodium hydroxide into the mixture, adjusting the pH value to 8, then adding nano graphene oxide, uniformly mixing, heating to 60 ℃, carrying out heat preservation treatment for 5 hours, then adding polyethylene glycol, uniformly mixing, continuing heat preservation treatment for 15 hours, cooling to room temperature, carrying out centrifugal separation, and air drying to obtain the energy storage and heat storage additive.
Wherein the weight ratio of the styrene monomer to the polyethylene glycol to the nano graphene oxide is 3:8: 1.
At the moment, the heat energy storage additive is graphene oxide coated silicon dioxide modified polystyrene-acrylonitrile grafted polyethylene glycol.
Preparation example 2
An energy storage and heat storage additive is prepared by the following method:
s11, under the conditions of nitrogen protection and continuous stirring, adding an acrylonitrile monomer and a propylene monomer into the modified nano-silica, uniformly mixing, then adding an initiator which is ammonium persulfate, heating to 85 ℃, carrying out heat preservation treatment for 22h, and cooling to room temperature to obtain the silica modified polystyrene-acrylonitrile.
Wherein the weight ratio of the styrene monomer to the acrylonitrile monomer to the modified nano silicon dioxide is 3.5:1.5: 2.5.
The addition amount of the initiator is 2 percent of the total weight of the propylene monomer and the acrylonitrile monomer.
S12, adding the silicon dioxide modified polystyrene-acrylonitrile into the acidic aqueous solution under the condition of continuous stirring, uniformly mixing, heating to 80 ℃, carrying out heat preservation treatment for 9 hours, and cooling to room temperature to obtain a mixture.
The acid aqueous solution is a mixture of a hydrochloric acid solution and a sulfuric acid solution, the weight ratio of the hydrochloric acid solution to the sulfuric acid solution is 1:1, the mass concentration of the hydrochloric acid solution is 10%, and the mass solubility of the sulfuric acid solution is 24%.
The weight ratio of the styrene monomer to the acidic aqueous solution is 3.5: 65.
S13, under the condition of continuously stirring, adding sodium hydroxide into the mixture, adjusting the pH value to 8.5, then adding nano graphene oxide, uniformly mixing, heating to 65 ℃, carrying out heat preservation treatment for 4.5 hours, then adding polyethylene glycol, uniformly mixing, continuously carrying out heat preservation treatment for 14 hours, cooling to room temperature, carrying out centrifugal separation, and carrying out air drying to obtain the energy storage and heat storage additive.
Wherein the weight ratio of the styrene monomer to the polyethylene glycol to the nano graphene oxide is 3.5:9: 1.5.
At the moment, the heat energy storage additive is graphene oxide coated silicon dioxide modified polystyrene-acrylonitrile grafted polyethylene glycol.
Preparation example 3
An energy storage and heat storage additive is prepared by the following method:
s11, under the conditions of nitrogen protection and continuous stirring, adding an acrylonitrile monomer and a propylene monomer into the modified nano-silica, uniformly mixing, then adding an initiator which is ammonium persulfate, heating to 90 ℃, carrying out heat preservation treatment for 20 hours, and cooling to room temperature to obtain the silica modified polystyrene-acrylonitrile.
Wherein the weight ratio of the styrene monomer to the acrylonitrile monomer to the modified nano silicon dioxide is 4:2: 3.
The addition amount of the initiator is 2.5 percent of the total weight of the propylene monomer and the acrylonitrile monomer.
S12, adding the silicon dioxide modified polystyrene-acrylonitrile into the acidic aqueous solution under the condition of continuous stirring, uniformly mixing, heating to 85 ℃, carrying out heat preservation treatment for 8 hours, and cooling to room temperature to obtain a mixture.
The acid aqueous solution is a mixture of a hydrochloric acid solution and a sulfuric acid solution, the weight ratio of the hydrochloric acid solution to the sulfuric acid solution is 1:1, the mass concentration of the hydrochloric acid solution is 8%, and the mass solubility of the sulfuric acid solution is 25%.
The weight ratio of the styrene monomer to the acidic aqueous solution is 4: 70.
S13, under the condition of continuously stirring, adding sodium hydroxide into the mixture, adjusting the pH value to 9, then adding nano graphene oxide, uniformly mixing, heating to 70 ℃, carrying out heat preservation treatment for 4 hours, then adding polyethylene glycol, uniformly mixing, continuing heat preservation treatment for 12 hours, cooling to room temperature, carrying out centrifugal separation, and air drying to obtain the energy storage and heat storage additive.
Wherein the weight ratio of the styrene monomer to the polyethylene glycol to the nano graphene oxide is 4:10: 2.
At the moment, the heat energy storage additive is graphene oxide coated silicon dioxide modified polystyrene-acrylonitrile grafted polyethylene glycol.
Examples
TABLE 1 examples concrete raw material contents (unit: kg)
| Raw materials | Example 1 | Example 2 | Example 3 |
| Cement | 510 | 485 | 465 |
| River sand | 625 | 669 | 725 |
| Crushing stone | 1120 | 1080 | 1020 |
| Silica fume | 27 | 25 | 23 |
| Fly ash | 55 | 63 | 70 |
| Water (W) | 129 | 143 | 157 |
| Water reducing agent | 7.9 | 8.3 | 9.4 |
| Energy storage and heat storage additive | 7.6 | 8.2 | 9.1 |
| Steel fiber | 22 | 25 | 30 |
| Polypropylene fiber | 16 | 13 | 11 |
Example 1
A preparation process of high-strength concrete comprises the following steps:
s1, weighing the following raw materials in the ratio shown in Table 1.
Cement, sand, stones, silica fume, fly ash, water, a water reducing agent, an energy storage and heat storage additive, steel fibers and polypropylene fibers.
Wherein the energy storage and heat storage additive is obtained by adopting preparation example 1.
S2, under the condition of continuous stirring, uniformly mixing cement, sand, stones, silica fume, fly ash and the energy storage and heat storage additive, then adding water and the water reducing agent, uniformly mixing, then adding the steel fibers and the polypropylene fibers, and uniformly mixing to obtain the concrete mixture.
And S3, pouring and curing the concrete mixture to obtain the concrete.
Wherein, the maintenance adopts the following method: curing for 7 days under the conditions of temperature of 20 ℃ and humidity of 80%, and curing for 21 days under the conditions of room temperature and humidity of 50%.
Examples 2 to 3
The preparation process of the high-strength concrete is different from that of the embodiment 1 in the raw material ratio in the step S1, and the raw material ratio is shown in Table 1.
Example 4
The preparation process of the high-strength concrete is different from that of the embodiment 2 in that the energy storage and heat storage additive in the raw material of the step S1 is different, and the energy storage and heat storage additive is obtained by the preparation example 2.
Example 5
The preparation process of the high-strength concrete is different from that of the embodiment 2 in that the energy-storing and heat-storing additive in the raw material of the step S1 is different from that obtained in the preparation example 3.
Example 6
A process for producing high-strength concrete, which is different from example 4 in that the curing method in step S3 is different.
The maintenance adopts the following method: curing for 9 days under the conditions of 25 ℃ and 85% humidity, and curing for 23 days under the conditions of room temperature and 55% humidity.
Example 7
A process for producing high-strength concrete, which is different from example 4 in that the curing method in step S3 is different.
The maintenance adopts the following method: curing for 10 days under the conditions of the temperature of 30 ℃ and the humidity of 90 percent, and then curing for 25 days under the conditions of the room temperature and the humidity of 50 percent.
Comparative example
Comparative example 1
The preparation process of the high-strength concrete is different from that of the embodiment 4 in that the raw material of the step S1 contains different energy storage and heat storage additives, and the heat energy storage additive is polystyrene-acrylonitrile grafted polyethylene glycol.
The energy storage and heat storage additive is prepared by the following method:
s11, under the protection of nitrogen and under the condition of continuous stirring, mixing the acrylonitrile monomer and the propylene monomer uniformly, then adding an initiator which is ammonium persulfate, heating to 85 ℃, carrying out heat preservation treatment for 22h, and cooling to room temperature to obtain the polystyrene-acrylonitrile.
Wherein the weight ratio of the styrene monomer to the acrylonitrile monomer is 3.5: 1.5.
The addition amount of the initiator is 2 percent of the total weight of the propylene monomer and the acrylonitrile monomer.
S12, adding polystyrene-acrylonitrile into the acidic aqueous solution under the condition of continuous stirring, uniformly mixing, heating to 80 ℃, carrying out heat preservation treatment for 9 hours, and cooling to room temperature to obtain a mixture.
The acid aqueous solution is a mixture of a hydrochloric acid solution and a sulfuric acid solution, the weight ratio of the hydrochloric acid solution to the sulfuric acid solution is 1:1, the mass concentration of the hydrochloric acid solution is 10%, and the mass solubility of the sulfuric acid solution is 24%.
The weight ratio of the styrene monomer to the acidic aqueous solution is 3.5: 65.
S13, under the condition of continuously stirring, adding sodium hydroxide into the mixture, adjusting the pH value to 8.5, then adding polyethylene glycol, uniformly mixing, heating to 65 ℃, carrying out heat preservation treatment for 14h, cooling to room temperature, carrying out centrifugal separation, and air drying to obtain the energy storage and heat storage additive.
Comparative example 2
A preparation process of high-strength concrete, which is different from the preparation process of example 4 in that no energy storage and heat storage additive is added in the raw material of step S1.
Comparative example 3
A process for preparing high strength concrete, which is different from example 4 in that steel fiber is not added to the raw material of step S1.
Comparative example 4
A process for preparing high strength concrete, which is different from example 4 in that polypropylene fiber is not added to the raw material of step S1.
Comparative example 5
The preparation process of the high-strength concrete is different from the preparation process of the embodiment 4 in that the energy storage and heat storage additive, the steel fiber and the polypropylene fiber are not added into the raw materials of the step S1.
Performance test
Samples were prepared from the concrete obtained in examples 1 to 7 and comparative examples 1 to 5, and the following property tests were carried out, and the test results are shown in Table 2.
The compressive strength, the flexural strength and the water permeability coefficient of the sample are detected according to GB/T50081-2019 test method standards for physical and mechanical properties of concrete.
According to JTGE30-2005 Highway engineering cement and cement concrete test Specification, samples are tested for impermeability and graded, and impermeability is S2, S4, S6, S8, S10 and S12 from low to high.
According to GB/T50082-2009 test method standards for long-term performance and durability of common concrete, samples are subjected to freeze-thaw cycling, and cracking conditions of the samples before and after the freeze-thaw cycling are detected.
TABLE 2 test results
As can be seen from Table 2, the concrete obtained by the preparation process of the high-strength concrete has high compressive strength and breaking strength, the compressive strength is 51.2-54.5MPa, the breaking strength is 8.1-8.9MPa, the concrete also has high anti-permeability grade, the anti-permeability grade is S10, no crack exists on the surface after the freeze-thaw cycle is 200 times, a small amount of small cracks exist on the surface after the freeze-thaw cycle is 300 times, the concrete not only has good crack resistance, but also has good frost resistance, the condition that the concrete cracks are generated is reduced, the comprehensive performance of the concrete is improved, the use stability and the service life of the concrete are also improved, and the concrete has good application prospects.
By comparing comparative examples 1 to 2, it can be seen that the addition of polystyrene-acrylonitrile graft polyethylene glycol to the raw materials of concrete improves the crack resistance and frost resistance of concrete, and also improves the impermeability of concrete, but reduces the compressive strength and flexural strength of concrete. By comparing the example 4 with the comparative example 1, it can be seen that the addition of the graphene oxide coated silica modified polystyrene-acrylonitrile grafted polyethylene glycol to the raw materials of the concrete not only improves the frost resistance of the concrete, but also improves the compressive strength and the flexural strength of the concrete, i.e., the influence of the polystyrene-acrylonitrile grafted polyethylene glycol on the strength of the concrete is reduced and the comprehensive performance of the concrete is improved by modifying the polystyrene-acrylonitrile grafted polyethylene glycol with the graphene oxide and the silica.
By comparing the example 4 with the comparative examples 2 to 5, it can be seen that the compressive strength, the flexural strength and the impermeability of the concrete are improved by adding the graphene oxide coated silica modified polystyrene-acrylonitrile grafted polyethylene glycol, the steel fibers and the polypropylene fibers into the raw materials of the concrete and by the synergistic effect of the polyethylene oxide coated silica modified polystyrene-acrylonitrile grafted polyethylene glycol, the steel fibers and the polypropylene fibers, the cracking resistance and the frost resistance of the concrete are improved, the comprehensive performance of the concrete is improved, and the service stability and the service life of the concrete are also improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. A preparation process of high-strength concrete is characterized by comprising the following steps: the method comprises the following steps:
s1, weighing the following raw materials in parts by weight: 510 parts of cement 465-sand, 725 parts of sand 625-sand, 1120 parts of stone 1020-sand, 23-27 parts of silica fume, 55-70 parts of fly ash, 157 parts of water 129-sand, 7.9-9.4 parts of water reducing agent, 7.6-9.1 parts of energy storage and heat storage additive, 22-30 parts of steel fiber and 11-16 parts of polypropylene fiber; s2, under the condition of continuous stirring, uniformly mixing cement, sand, stones, silica fume, fly ash and an energy storage and heat storage additive, then adding water and a water reducing agent, uniformly mixing, and then adding steel fibers and polypropylene fibers, and uniformly mixing to obtain a concrete mixture; s3, pouring and curing the concrete mixture to obtain concrete;
the energy storage and heat storage additive is graphene oxide coated silicon dioxide modified polystyrene-acrylonitrile grafted polyethylene glycol;
the energy storage and heat storage additive is prepared by the following method:
s11, under the conditions of inert gas protection and continuous stirring, adding a propylene monomer and an acrylonitrile monomer into the modified nano-silica, uniformly mixing, then adding an initiator, heating to 80-90 ℃, carrying out heat preservation treatment for 20-24h, and cooling to room temperature to obtain silica modified polystyrene-acrylonitrile; s12, adding the silicon dioxide modified polystyrene-acrylonitrile into the acidic aqueous solution under the condition of continuous stirring, uniformly mixing, heating to 75-85 ℃, carrying out heat preservation treatment for 8-10h, and cooling to room temperature to obtain a mixture; s13, under the condition of continuous stirring, adding sodium hydroxide into the mixture, adjusting the pH value to 8-9, then adding nano graphene oxide, uniformly mixing, heating to 60-70 ℃, carrying out heat preservation treatment for 4-5h, then adding polyethylene glycol, uniformly mixing, continuing to carry out heat preservation treatment for 12-15h, cooling to room temperature, carrying out centrifugal separation, and carrying out air drying to obtain an energy storage and heat storage additive;
wherein the weight ratio of styrene monomer, acrylonitrile monomer, polyethylene glycol, modified silicon dioxide and nano graphene oxide is (3-4): (1-2): (8-10): (2-3): (1-2); the weight ratio of the styrene monomer to the acidic aqueous solution is (3-4) to (60-70); the acid aqueous solution is a mixture of a hydrochloric acid solution and a sulfuric acid solution, the weight ratio of the hydrochloric acid solution to the sulfuric acid solution is 1:1, the mass concentration of the hydrochloric acid solution is 8-11%, and the mass solubility of the sulfuric acid solution is 22-25%;
the modified nano silicon dioxide is silane coupling agent modified nano silicon dioxide; the silane coupling agent modified nano silicon dioxide is gamma-methacryloxypropyltrimethoxysilane modified nano silicon dioxide and is selected from new Hangzhou Jikang material Co.
2. The process for preparing high-strength concrete according to claim 1, wherein: the addition amount of the initiator is 1.5-2.5% of the total weight of the propylene monomer and the acrylonitrile monomer.
3. The process for preparing high-strength concrete according to claim 2, wherein: the initiator is ammonium persulfate.
4. The process for preparing high-strength concrete according to claim 1, wherein: the polyethylene glycol is PEG 4000.
5. The process for preparing high-strength concrete according to claim 1, wherein: the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
6. The process for preparing high-strength concrete according to claim 1, wherein: in step S3, the following method is used for curing: firstly, under the conditions of temperature of 20-30 ℃ and humidity of 80-90%, the curing time is 7-10d, and then under the conditions of room temperature and humidity of 50-60%, the curing time is at least 21 d.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103285793A (en) * | 2013-06-14 | 2013-09-11 | 复旦大学 | Method for preparing hollow polymer microsphere coated with phase change material |
| CN106811179A (en) * | 2017-01-03 | 2017-06-09 | 温州大学 | The preparation method of polyethylene glycol/silicon dioxide composite phase-change energy storage material |
| CN112408904A (en) * | 2020-11-17 | 2021-02-26 | 上海群宝建材有限公司 | Concrete material with phase-change heat storage function and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103285793A (en) * | 2013-06-14 | 2013-09-11 | 复旦大学 | Method for preparing hollow polymer microsphere coated with phase change material |
| CN106811179A (en) * | 2017-01-03 | 2017-06-09 | 温州大学 | The preparation method of polyethylene glycol/silicon dioxide composite phase-change energy storage material |
| CN112408904A (en) * | 2020-11-17 | 2021-02-26 | 上海群宝建材有限公司 | Concrete material with phase-change heat storage function and preparation method thereof |
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