CN116768571B - High-strength pavement concrete and preparation method thereof - Google Patents
High-strength pavement concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 95
- 238000002360 preparation method Methods 0.000 title abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 218
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 58
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 38
- 239000004568 cement Substances 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 88
- 239000000843 powder Substances 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 30
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 18
- 229920005646 polycarboxylate Polymers 0.000 claims description 18
- 239000000176 sodium gluconate Substances 0.000 claims description 18
- 229940005574 sodium gluconate Drugs 0.000 claims description 18
- 235000012207 sodium gluconate Nutrition 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000003365 glass fiber Substances 0.000 claims description 10
- 238000002715 modification method Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
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- 230000000694 effects Effects 0.000 description 27
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- 230000008025 crystallization Effects 0.000 description 15
- 239000002245 particle Substances 0.000 description 11
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- 230000008023 solidification Effects 0.000 description 10
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- 239000013078 crystal Substances 0.000 description 9
- 230000001788 irregular Effects 0.000 description 9
- 230000001939 inductive effect Effects 0.000 description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 235000010755 mineral Nutrition 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 239000011859 microparticle Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 241000557116 Macleaya <angiosperm> Species 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 4
- 238000003889 chemical engineering Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 229910021485 fumed silica Inorganic materials 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
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- 230000003487 anti-permeability effect Effects 0.000 description 1
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Classifications
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- 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 relates to the technical field of concrete, and in particular discloses high-strength pavement concrete and a preparation method thereof, wherein the high-strength pavement concrete comprises the following components in parts by weight: 100 parts of water; 323-327 parts of cement; 26-30 parts of fly ash; 460-470 parts of fine aggregate; 660-670 parts of coarse aggregate; 3.1-3.5 parts of water reducer; 2.8-3.2 parts of toughening fiber; 26-30 parts of modified silicon dioxide powder; the modified silicon dioxide powder is prepared by mixing silicon dioxide steam and ethanol steam with the temperature of 150-400 ℃. The invention has the advantage of further improving the strength of the concrete after curing.
Description
Technical Field
The invention relates to the field of concrete, in particular to high-strength pavement concrete and a preparation method thereof.
Background
The concrete pavement generally comprises four parts of roadbed, base layer, cushion layer and surface layer, wherein the surface layer is made of concrete, and the surface layer made of concrete has the advantages of wear resistance, flatness, skid resistance, high strength and the like.
With the development of logistics industry, the demand for road transportation capability is larger and larger, under the condition that the carrying capacity of trucks is larger and larger, the demand for the carrying capacity of the road surface is higher and higher, the strength of concrete for preparing the road surface layer is required to be improved to improve the carrying capacity of the road surface, the strength of concrete is improved at present mainly by adjusting the water-cement ratio, the lower the water-cement ratio is, the higher the strength of the concrete is, but the mobility of the concrete is reduced, internal bubbles are difficult to discharge after concrete pouring is caused, tamping is required through a vibrating rod, but the road construction surface is positive and wide, the large-area tamping operation is difficult, the compactness of the concrete road surface is relatively lower, the strength performance of the concrete cannot be fully exerted, the effect of reducing the water-cement ratio to improve the strength of the concrete road surface cannot be fully exerted, and the bearing limit of the road is limited, and therefore, the space is improved.
Disclosure of Invention
In order to further improve the strength of the cured concrete, the application provides high-strength pavement concrete and a preparation method thereof.
In a first aspect, the present application provides a high-strength pavement concrete, which adopts the following technical scheme:
the high-strength pavement concrete comprises the following components in parts by weight:
100 parts of water;
323-327 parts of cement;
26-30 parts of fly ash;
460-470 parts of fine aggregate;
660-670 parts of coarse aggregate;
3.1-3.5 parts of water reducer;
2.8-3.2 parts of toughening fiber;
26-30 parts of modified silicon dioxide powder;
the modified silicon dioxide powder is prepared by mixing silicon dioxide steam and ethanol steam at 150-400 ℃.
Through adopting above-mentioned technical scheme, through mixing silica vapor and ethanol vapor, utilize ethanol vapor to cool off silica vapor for silica cools off under the induced action of ethanol vapor and forms special and irregular crystal structure, thereby prepare modified silica powder, through the addition of modified silica powder, can fill in the hole of concrete, make the compactness of concrete higher, and because the special crystal structure of silica powder, the adhesion with the set cement is stronger, have better reinforcement effect, simultaneously can also improve the anticracking performance after the concrete solidification, make the concrete also can further improve intensity under the prerequisite of not adjusting the water-cement ratio, and can not be filled by modified silica powder by the gas pocket of ramming when reducing the water-cement ratio, and modified silica powder can also fill the hole that concrete solidification shrink produced, make the concrete compactness higher, the strength promotion after the concrete solidification is more showing through the better reinforcement performance of cooperation modified silica powder again, more difficult breakage, the crack, the road surface of making has higher bearing capacity, better promotion of logistics industry.
Preferably, the modification method of the modified silica powder is as follows:
step 1), injecting ethanol steam with the temperature of 150-200 ℃ into an oxygen-free and sealed container until the pressure in the container is 0.15-0.2MPa;
step 2), injecting silicon dioxide steam with the temperature of 2400-2500 ℃ into the container, and keeping the temperature of ethanol steam in the container constant at 150-400 ℃;
step 3), cooling the container to room temperature, discharging, and filtering to obtain solid powder;
and 4) heating and drying the solid powder to obtain modified silicon dioxide powder.
Through adopting above-mentioned technical scheme, through cooling down under higher vapor pressure for silica vapor is fully wrapped up by ethanol vapor, extrudes, thereby induces silica cooling crystallization to form special irregular crystal microparticle's effect better, simultaneously because it is cooling down in gas, makes the particle diameter of the modified silica powder that crystallization formed less, can pass through 2000 mesh screen cloth, and the effect of filling the hole is better.
Preferably, in the step 2), the injection flow rate of the silica vapor is 1 to 1.5% of the volume of the vessel/min.
Through adopting above-mentioned technical scheme, through the injection rate of control silica steam, the effect of cooling crystallization is better, can control the particle diameter of crystalline better for the particle diameter is less, and the effect of induced crystallization formation special irregular microparticle is better, thereby better to the reinforcement effect of concrete.
Preferably, the water reducing agent is a compound of a polycarboxylate water reducing agent and sodium gluconate.
Through adopting above-mentioned technical scheme, through specifically adopting polycarboxylate water-reducing agent and sodium gluconate to compound as the water-reducing agent for the water-reducing effect is better, and concrete fluidity is better, more easily discharges the bubble, improves the compactness, thereby makes the intensity after the concrete solidification higher.
Preferably, the mass ratio of the polycarboxylate water reducer to the sodium gluconate is 1:3.
through adopting above-mentioned technical scheme, through the mass ratio of concrete selection polycarboxylate water-reducing agent and sodium gluconate, the water-reducing effect is better, and the retarding effect is more suitable, further improves the compactness of concrete, and concrete solidification back intensity is higher.
Preferably, the toughening fiber is a glass fiber.
By adopting the technical scheme, the glass fiber is adopted, so that the toughening effect is better, and the concrete is less prone to cracking after solidification.
Preferably, the length of the glass fiber is 5-10mm.
Through adopting above-mentioned technical scheme, through the length of concrete selection glass fiber, the effect of reducing concrete fracture is better, and the road surface of making is difficult for appearing the crackle.
In a second aspect, the present application provides a method for preparing high-strength pavement concrete, which adopts the following technical scheme:
the preparation method of the high-strength pavement concrete is characterized by comprising the following steps of: the method comprises the following steps:
step 01), uniformly mixing water, cement, fly ash, a water reducing agent, toughening fibers and modified silicon dioxide powder to obtain a premix;
and 02) adding the fine aggregate and the coarse aggregate into the premix, and uniformly mixing to obtain the high-strength pavement concrete.
By adopting the technical scheme, the prepared concrete has higher fluidity, can better discharge bubbles, has higher strength after the concrete is solidified and better cracking resistance, and the prepared pavement has higher bearing capacity and is not easy to break and crack.
In summary, the present application has the following beneficial effects:
1. according to the method, the silica vapor is mixed with the ethanol vapor, the ethanol vapor is utilized to cool the silica vapor, so that the silica is cooled to form a special and irregular crystal structure under the induction action of the ethanol vapor, modified silica powder is prepared, the modified silica powder is added, the pores of concrete can be filled, the compactness of the concrete is higher, the binding force with cement stone is stronger due to the special crystal structure of the silica powder, the reinforcing effect is better, the cracking resistance of the concrete after solidification can be improved, the strength of the concrete can be further improved on the premise that the cement ratio is not regulated, the water cement ratio is reduced, pores which cannot be tamped are also easier to be filled with the modified silica powder, the pores generated by solidification shrinkage of the concrete can be filled with the modified silica powder, the compactness of the concrete is higher, the strength after the concrete is solidified is improved more remarkably by matching with the modified silica powder, and the concrete is less prone to breakage and cracking.
2. In the application, the cooling is preferably performed under higher steam pressure, so that the silica steam is fully wrapped and extruded by the ethanol steam, the effect of inducing the silica to be cooled and crystallized to form special irregular crystal microparticles is better, and meanwhile, the cooling is performed in the gas, so that the particle size of the modified silica powder formed by crystallization is smaller, and the effect of filling pores is better through a 2000-mesh screen.
3. In this application, the effect of cooling crystallization is better through controlling the injection speed of silica vapor, can control the particle diameter of crystalline better for the particle diameter is less, and the effect of induced crystallization formation special irregular microparticle is better, thereby better to the reinforcement effect of concrete.
Detailed Description
The present application is described in further detail below with reference to examples.
Example 1
A high-strength pavement concrete is prepared from the following components:
water, cement, fly ash, fine aggregate, coarse aggregate, water reducer, toughening fiber and modified silicon dioxide powder.
Wherein the water is tap water.
Wherein, the cement is ordinary Portland cement, runfeng cement and the factory specification is P.O 42.5.5R.
Wherein the fly ash is first-grade fly ash and is purchased in a happy mineral product processing plant in the Shang-shou county.
Wherein the fine aggregate is river sand, and is purchased in the mineral product processing factory of the ling shou county Cheng Yun, and is 8-16 meshes.
Wherein the coarse aggregate is crushed stone, and is purchased from Jiangsu Shangzhi building materials limited company, and has a particle size of 25-40mm.
Wherein the water reducing agent is a compound of a polycarboxylate water reducing agent and sodium gluconate, and the mass ratio of the polycarboxylate water reducing agent to the sodium gluconate is 1:3.
the polycarboxylate water reducer is purchased from Wuhan Runxing source technology Co.
Sodium gluconate was purchased from the chemical engineering company, macleaya, su.
The toughening fiber is glass fiber and is purchased from Shandong aerospace engineering materials limited company, and the length of the toughening fiber is 5mm.
Wherein, the modified silicon dioxide powder is self-made, and the modification method of the modified silicon dioxide powder is as follows:
step 1), injecting ethanol steam with the temperature of 150 ℃ into an oxygen-free and sealed cooling tank until the pressure in the cooling tank is 0.15MPa, and sealing the container.
Step 2), heating the silicon dioxide to boil to form silicon dioxide steam through heating equipment, heating the silicon dioxide steam to 2400 ℃, then communicating the silicon dioxide steam into a cooling tank through a pipeline, wherein the injection flow rate of the silicon dioxide steam is 1% of the volume/min of the cooling tank, the temperature of ethanol steam in a container is kept higher than 150 ℃ and lower than 400 ℃, a heat exchange tube is arranged in the cooling tank, and cooling and temperature control of the ethanol steam are realized by introducing warm water into the heat exchange tube, so that the effect of inducing cooling and crystallization of the silicon dioxide due to overhigh temperature of the ethanol steam is avoided.
And 3) stopping introducing the silicon dioxide steam when the volume of the silicon dioxide powder accumulated in the cooling tank reaches 30% of the volume of the cooling tank, cooling to room temperature in the cooling tank, discharging, filtering, and performing solid-liquid separation to obtain solid powder.
And 4) heating and drying the solid powder in an oven at 120 ℃, sieving with a 2000-mesh sieve, and collecting part of the powder which can be sieved to obtain modified silicon dioxide powder.
The preparation method of the high-strength pavement concrete comprises the following steps:
step 01), 100kg of water, 323kg of cement, 26kg of fly ash, 3.1kg of water reducer, 2.8kg of toughening fiber and 26kg of modified silicon dioxide powder are put into a stirring kettle, and stirred for 3min at a rotating speed of 120r/min, and are uniformly mixed to obtain a premix;
step 02), 460kg of fine aggregate and 660kg of coarse aggregate are added into the premix, the rotating speed is 60r/min, the mixture is stirred for 10min, and the high-strength pavement concrete is obtained after uniform mixing.
Example 2
A high-strength pavement concrete is prepared from the following components:
water, cement, fly ash, fine aggregate, coarse aggregate, water reducer, toughening fiber and modified silicon dioxide powder.
Wherein the water is tap water.
Wherein, the cement is ordinary Portland cement, runfeng cement and the factory specification is P.O 42.5.5R.
Wherein the fly ash is first-grade fly ash and is purchased in a happy mineral product processing plant in the Shang-shou county.
Wherein the fine aggregate is river sand, and is purchased in the mineral product processing factory of the ling shou county Cheng Yun, and is 8-16 meshes.
Wherein the coarse aggregate is crushed stone, and is purchased from Jiangsu Shangzhi building materials limited company, and has a particle size of 25-40mm.
Wherein the water reducing agent is a compound of a polycarboxylate water reducing agent and sodium gluconate, and the mass ratio of the polycarboxylate water reducing agent to the sodium gluconate is 1:3.
the polycarboxylate water reducer is purchased from Wuhan Runxing source technology Co.
Sodium gluconate was purchased from the chemical engineering company, macleaya, su.
The toughening fiber is glass fiber and is purchased from Shandong aerospace engineering materials limited company, and the length of the toughening fiber is 8mm.
Wherein, the modified silicon dioxide powder is self-made, and the modification method of the modified silicon dioxide powder is as follows:
step 1), injecting ethanol steam with the temperature of 175 ℃ into an oxygen-free and sealed cooling tank until the pressure in the cooling tank is 0.18MPa, and sealing the container.
Step 2), heating the silicon dioxide to boil to form silicon dioxide steam through heating equipment, heating the silicon dioxide steam to 2450 ℃, then communicating the silicon dioxide steam into a cooling tank through a pipeline, wherein the injection flow rate of the silicon dioxide steam is 1.2% of the volume/min of the cooling tank, the temperature of ethanol steam in a container is kept higher than 150 ℃ and lower than 400 ℃, a heat exchange tube is arranged in the cooling tank, and cooling and temperature control of the ethanol steam are realized by introducing water into the heat exchange tube, so that the effect of inducing the cooling and crystallization of the silicon dioxide due to overhigh temperature of the ethanol steam is avoided.
And 3) stopping introducing the silicon dioxide steam when the volume of the silicon dioxide powder accumulated in the cooling tank reaches 30% of the volume of the cooling tank, cooling to room temperature in the cooling tank, discharging, filtering, and performing solid-liquid separation to obtain solid powder.
And 4) heating and drying the solid powder in an oven at 120 ℃, sieving with a 2000-mesh sieve, and collecting part of the powder which can be sieved to obtain modified silicon dioxide powder.
The preparation method of the high-strength pavement concrete comprises the following steps:
step 01), 100kg of water, 325kg of cement, 28kg of fly ash, 3.3kg of water reducer, 3kg of toughening fiber and 28kg of modified silicon dioxide powder are put into a stirring kettle, stirred for 3min at a rotating speed of 120r/min, and uniformly mixed to obtain a premix;
step 02), 465kg of fine aggregate and 665kg of coarse aggregate are added into the premix, the rotating speed is 60r/min, the mixture is stirred for 10min, and the high-strength pavement concrete is obtained after uniform mixing.
Example 3
A high-strength pavement concrete is prepared from the following components:
water, cement, fly ash, fine aggregate, coarse aggregate, water reducer, toughening fiber and modified silicon dioxide powder.
Wherein the water is tap water.
Wherein, the cement is ordinary Portland cement, runfeng cement and the factory specification is P.O 42.5.5R.
Wherein the fly ash is first-grade fly ash and is purchased in a happy mineral product processing plant in the Shang-shou county.
Wherein the fine aggregate is river sand, and is purchased in the mineral product processing factory of the ling shou county Cheng Yun, and is 8-16 meshes.
Wherein the coarse aggregate is crushed stone, and is purchased from Jiangsu Shangzhi building materials limited company, and has a particle size of 25-40mm.
Wherein the water reducing agent is a compound of a polycarboxylate water reducing agent and sodium gluconate, and the mass ratio of the polycarboxylate water reducing agent to the sodium gluconate is 1:3.
the polycarboxylate water reducer is purchased from Wuhan Runxing source technology Co.
Sodium gluconate was purchased from the chemical engineering company, macleaya, su.
The toughening fiber is glass fiber and is purchased from Shandong aerospace engineering materials limited company, and the length of the toughening fiber is 10mm.
Wherein, the modified silicon dioxide powder is self-made, and the modification method of the modified silicon dioxide powder is as follows:
step 1), injecting ethanol steam with the temperature of 200 ℃ into an oxygen-free and sealed cooling tank until the pressure in the cooling tank is 0.2MPa, and sealing the container.
Step 2), heating the silicon dioxide to boil to form silicon dioxide steam through heating equipment, heating the silicon dioxide steam to 2500 ℃, then communicating the silicon dioxide steam into a cooling tank through a pipeline, wherein the injection flow rate of the silicon dioxide steam is 1.5% of the volume/min of the cooling tank, the temperature of ethanol steam in a container is kept higher than 150 ℃ and lower than 400 ℃, a heat exchange tube is arranged in the cooling tank, and cooling and temperature control of the ethanol steam are realized by introducing warm water into the heat exchange tube, so that the effect of inducing cooling and crystallization of the silicon dioxide due to overhigh temperature of the ethanol steam is avoided.
And 3) stopping introducing the silicon dioxide steam when the volume of the silicon dioxide powder accumulated in the cooling tank reaches 30% of the volume of the cooling tank, cooling to room temperature in the cooling tank, discharging, filtering, and performing solid-liquid separation to obtain solid powder.
And 4) heating and drying the solid powder in an oven at 120 ℃, sieving with a 2000-mesh sieve, and collecting part of the powder which can be sieved to obtain modified silicon dioxide powder.
The preparation method of the high-strength pavement concrete comprises the following steps:
step 01), 100kg of water, 327kg of cement, 30kg of fly ash, 3.5kg of water reducer, 3.2kg of toughening fiber and 30kg of modified silicon dioxide powder are put into a stirring kettle, and stirred for 3min at a rotating speed of 120r/min, and are uniformly mixed to obtain a premix;
step 02), 470kg of fine aggregate and 670kg of coarse aggregate are added into the premix, the rotating speed is 60r/min, the mixture is stirred for 10min, and the mixture is uniformly mixed to obtain the high-strength pavement concrete.
Example 4
A high-strength pavement concrete is prepared from the following components:
water, cement, fly ash, fine aggregate, coarse aggregate, water reducer, toughening fiber and modified silicon dioxide powder.
Wherein the water is tap water.
Wherein, the cement is ordinary Portland cement, runfeng cement and the factory specification is P.O 42.5.5R.
Wherein the fly ash is first-grade fly ash and is purchased in a happy mineral product processing plant in the Shang-shou county.
Wherein the fine aggregate is river sand, and is purchased in the mineral product processing factory of the ling shou county Cheng Yun, and is 8-16 meshes.
Wherein the coarse aggregate is crushed stone, and is purchased from Jiangsu Shangzhi building materials limited company, and has a particle size of 25-40mm.
Wherein the water reducing agent is a compound of a polycarboxylate water reducing agent and sodium gluconate, and the mass ratio of the polycarboxylate water reducing agent to the sodium gluconate is 1:3.
the polycarboxylate water reducer is purchased from Wuhan Runxing source technology Co.
Sodium gluconate was purchased from the chemical engineering company, macleaya, su.
The toughening fiber is glass fiber and is purchased from Shandong aerospace engineering materials limited company, and the length of the toughening fiber is 5mm.
Wherein, the modified silicon dioxide powder is self-made, and the modification method of the modified silicon dioxide powder is as follows:
step 1), injecting ethanol steam with the temperature of 175 ℃ into an oxygen-free and sealed cooling tank until the pressure in the cooling tank is 0.18MPa, and sealing the container.
Step 2), heating the silicon dioxide to boil to form silicon dioxide steam through heating equipment, heating the silicon dioxide steam to 2450 ℃, then communicating the silicon dioxide steam into a cooling tank through a pipeline, wherein the injection flow rate of the silicon dioxide steam is 1.2% of the volume/min of the cooling tank, the temperature of ethanol steam in a container is kept higher than 150 ℃ and lower than 400 ℃, a heat exchange tube is arranged in the cooling tank, and cooling and temperature control of the ethanol steam are realized by introducing water into the heat exchange tube, so that the effect of inducing the cooling and crystallization of the silicon dioxide due to overhigh temperature of the ethanol steam is avoided.
And 3) stopping introducing the silicon dioxide steam when the volume of the silicon dioxide powder accumulated in the cooling tank reaches 30% of the volume of the cooling tank, cooling to room temperature in the cooling tank, discharging, filtering, and performing solid-liquid separation to obtain solid powder.
And 4) heating and drying the solid powder in an oven at 120 ℃, sieving with a 2000-mesh sieve, and collecting part of the powder which can be sieved to obtain modified silicon dioxide powder.
The preparation method of the high-strength pavement concrete comprises the following steps:
step 01), 100kg of water, 325kg of cement, 28kg of fly ash, 3.3kg of water reducer, 3kg of toughening fiber and 28kg of modified silicon dioxide powder are put into a stirring kettle, stirred for 3min at a rotating speed of 120r/min, and uniformly mixed to obtain a premix;
step 02), 465kg of fine aggregate and 665kg of coarse aggregate are added into the premix, the rotating speed is 60r/min, the mixture is stirred for 10min, and the high-strength pavement concrete is obtained after uniform mixing.
Comparative example 1
The difference between the high-strength pavement concrete and the concrete of the embodiment 2 is that:
the modified silica powder was replaced with an equal amount of fumed silica powder.
Wherein the specification of the fumed silica powder is 2000 mesh.
Comparative example 2
The difference between the high-strength pavement concrete and the concrete of the embodiment 2 is that:
in the modification method of the modified silica powder, water vapor is used instead of ethanol vapor.
Comparative example 3
The difference between the high-strength pavement concrete and the concrete of the embodiment 2 is that:
the modification method of the modified silica powder is as follows:
step 1), injecting ethanol steam with the temperature of 175 ℃ into an oxygen-free and sealed cooling tank until the pressure in the cooling tank is 0.18MPa, and sealing the container.
Step 2), heating the silicon dioxide to boil to form silicon dioxide steam through heating equipment, heating the silicon dioxide steam to 2450 ℃, then communicating the silicon dioxide steam into a cooling tank through a pipeline, wherein the injection flow rate of the silicon dioxide steam is 1.2% of the volume/min of the cooling tank, the temperature of ethanol steam in a container is kept higher than 450 ℃ and lower than 800 ℃, a heat exchange tube is arranged in the cooling tank, and cooling and temperature control of the ethanol steam are realized by introducing water into the heat exchange tube, so that the effect of inducing the cooling and crystallization of the silicon dioxide due to overhigh temperature of the ethanol steam is avoided.
And 3) stopping introducing the silicon dioxide steam when the volume of the silicon dioxide powder accumulated in the cooling tank reaches 30% of the volume of the cooling tank, cooling to room temperature in the cooling tank, discharging, filtering, and performing solid-liquid separation to obtain solid powder.
And 4) heating and drying the solid powder in an oven at 120 ℃ to obtain modified silicon dioxide powder.
Comparative example 4
The difference between the high-strength pavement concrete and the concrete of the embodiment 2 is that:
the modification method of the modified silica powder is as follows:
step 1), injecting ethanol steam with the temperature of 175 ℃ into an oxygen-free and sealed cooling tank until the pressure in the cooling tank is 0.18MPa, and sealing the container.
Step 2), heating the silicon dioxide to boil to form silicon dioxide steam through heating equipment, heating the silicon dioxide steam to 2450 ℃, then communicating the silicon dioxide steam into a cooling tank through a pipeline, wherein the injection flow rate of the silicon dioxide steam is 2.5% of the volume/min of the cooling tank, the temperature of ethanol steam in a container is kept higher than 150 ℃ and lower than 400 ℃, a heat exchange tube is arranged in the cooling tank, and cooling and temperature control of the ethanol steam are realized by introducing water into the heat exchange tube, so that the effect of inducing the cooling and crystallization of the silicon dioxide due to overhigh temperature of the ethanol steam is avoided.
And 3) stopping introducing the silicon dioxide steam when the volume of the silicon dioxide powder accumulated in the cooling tank reaches 30% of the volume of the cooling tank, cooling to room temperature in the cooling tank, discharging, filtering, and performing solid-liquid separation to obtain solid powder.
And 4) heating and drying the solid powder in an oven at 120 ℃ to obtain modified silicon dioxide powder.
Comparative example 5
The difference between the high-strength pavement concrete and the concrete of the embodiment 2 is that:
the modification method of the modified silica powder is as follows:
step 1), injecting ethanol steam with the temperature of 175 ℃ into an oxygen-free and sealed cooling tank until the pressure in the cooling tank is 0.11MPa, and sealing the container.
Step 2), heating the silicon dioxide to boil to form silicon dioxide steam through heating equipment, heating the silicon dioxide steam to 2450 ℃, then communicating the silicon dioxide steam into a cooling tank through a pipeline, wherein the injection flow rate of the silicon dioxide steam is 1.2% of the volume/min of the cooling tank, the temperature of ethanol steam in a container is kept higher than 150 ℃ and lower than 400 ℃, a heat exchange tube is arranged in the cooling tank, and cooling and temperature control of the ethanol steam are realized by introducing water into the heat exchange tube, so that the effect of inducing the cooling and crystallization of the silicon dioxide due to overhigh temperature of the ethanol steam is avoided.
And 3) stopping introducing the silicon dioxide steam when the volume of the silicon dioxide powder accumulated in the cooling tank reaches 30% of the volume of the cooling tank, cooling to room temperature in the cooling tank, discharging, filtering, and performing solid-liquid separation to obtain solid powder.
And 4) heating and drying the solid powder in an oven at 120 ℃ to obtain modified silicon dioxide powder.
Experiment 1
Performance test:
1. compressive strength: the 7d compressive strength and the 28d compressive strength of the samples prepared from the high-strength pavement concrete of each example and the comparative example are detected according to GB/T50081-2019 Standard of test method for physical and mechanical properties of concrete.
2. Flexural strength: the 28d flexural strength of the test sample prepared from the high-strength pavement concrete of each example and comparative example was tested according to GB/T50081-2019 Standard of test method for physical and mechanical properties of concrete.
3. Barrier grade: according to GB/T50082-2009 Standard of method for testing the long-term performance and durability of ordinary concrete, a progressive pressurizing method in a water penetration resistance test is adopted to detect the anti-permeability grade of samples prepared from the high-strength pavement concrete of each example and comparative example.
The specific test data for experiment 1 are detailed in table 1.
TABLE 1
According to the data comparison of each example and comparative example in the table 1, the modified silicon dioxide powder modified by adopting a special process is added, so that the compressive strength and the flexural strength of the concrete after curing can be effectively improved, the strength performance of the concrete after curing can be further improved on the premise of not adjusting the water-cement ratio, the fluidity of the concrete can be better maintained, and the construction performance is better.
When the ethanol vapor is controlled to be maintained at 150-250 ℃, the quality of the prepared modified silicon dioxide powder is optimal, and the effect of improving the strength of the concrete after curing is best.
When the ethanol vapor is replaced by water vapor for cooling, the reinforcing effect of the prepared silicon dioxide powder is similar to that of the existing fumed silica, and therefore, the silicon dioxide can be well induced to crystallize to form irregular crystal microparticles only when the ethanol vapor is used for cooling, and the effect of improving the strength of the concrete after solidification is achieved.
When the specific flow rate is adopted to inject the silicon dioxide steam, the prepared silicon dioxide powder is better in reinforcement, the silicon dioxide can be better induced to crystallize to form irregular crystal microparticles, and the effect of improving the strength of the concrete after solidification is better.
When the specific ethanol vapor pressure is adopted to cool the silicon dioxide vapor, the silicon dioxide crystallization can be better induced to form irregular crystal micro-particles, the particle size of the modified silicon dioxide powder is smaller, and the effect of reinforcing the concrete is better.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (6)
1. The utility model provides a high strength pavement concrete which characterized in that: comprises the following components in parts by mass:
100 parts of water;
323-327 parts of cement;
26-30 parts of fly ash;
460-470 parts of fine aggregate;
660-670 parts of coarse aggregate;
3.1-3.5 parts of water reducer;
2.8-3.2 parts of toughening fiber;
26-30 parts of modified silicon dioxide powder;
the modification method of the modified silicon dioxide powder comprises the following steps:
step 1), injecting ethanol steam with the temperature of 150-200 ℃ into an oxygen-free and sealed container until the pressure in the container is 0.15-0.2MPa;
step 2), injecting silicon dioxide steam with the temperature of 2400-2500 ℃ into the container, and keeping the temperature of ethanol steam in the container constant at 150-400 ℃;
step 3), cooling the container to room temperature, discharging, and filtering to obtain solid powder;
step 4), heating and drying the solid powder, sieving with a 2000-mesh sieve, and collecting part of the powder which can be sieved to obtain modified silicon dioxide powder;
in said step 2), the injection flow rate of the silica vapor is 1-1.5% of the vessel volume/min.
2. The high strength pavement concrete according to claim 1, wherein: the water reducer is a compound of a polycarboxylate water reducer and sodium gluconate.
3. A high strength pavement concrete according to claim 2, wherein: the mass ratio of the polycarboxylate water reducer to the sodium gluconate is 1:3.
4. the high strength pavement concrete according to claim 1, wherein: the toughening fiber is glass fiber.
5. The high strength pavement concrete according to claim 4, wherein: the length of the glass fiber is 5-10mm.
6. A method for producing the high-strength pavement concrete according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
step 01), uniformly mixing water, cement, fly ash, a water reducing agent, toughening fibers and modified silicon dioxide powder to obtain a premix;
and 02) adding the fine aggregate and the coarse aggregate into the premix, and uniformly mixing to obtain the high-strength pavement concrete.
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