CN110627399B - Enhanced concrete nano additive, preparation method and application thereof - Google Patents
Enhanced concrete nano additive, preparation method and application thereof Download PDFInfo
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- CN110627399B CN110627399B CN201910833142.9A CN201910833142A CN110627399B CN 110627399 B CN110627399 B CN 110627399B CN 201910833142 A CN201910833142 A CN 201910833142A CN 110627399 B CN110627399 B CN 110627399B
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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Abstract
The invention discloses an enhanced concrete nano additive: the high-performance nano silicon dioxide water reducing agent comprises 80-90 parts of nano silicon dioxide, 0.1-0.5 part of synthetic high-polymer tackifying material, 0.8-1.5 parts of sodium thiocyanate, 1-6 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.5-1.5 parts of carbamide, 0.1-1.2 parts of sodium nitrite, 0.5-1.5 parts of sodium nitrate, 1-5 parts of aluminum potassium sulfate dodecahydrate and 0.1-0.5 part of powdery defoaming agent. A method of preparing the reinforced concrete nanoadmixture of claim 1, comprising the steps of: placing the nanoscale silicon dioxide, the synthetic high-molecular tackifying material and the powdery polycarboxylic acid high-performance water reducing agent into a stirring device for first stirring and mixing to obtain first mixed powder; adding aluminum potassium sulfate dodecahydrate and a powder defoaming agent into the first mixed powder, and stirring the mixture by using a stirring device to react to obtain second mixed powder; and adding carbamide, sodium thiocyanate, sodium nitrite and barium nitrate into the second mixed powder, and stirring and reacting by a stirring device to obtain the enhanced concrete nano additive.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an enhanced concrete nano additive, a preparation method and application thereof.
Background
The concrete admixture is doped into the concrete in a small amount, so that the resilience of the sprayed concrete can be greatly reduced, the resilience can be controlled within 10 percent generally, the construction cost is greatly saved, the tunnel construction progress is accelerated, the strength of the concrete at each age is greatly improved, and the construction potential safety hazard is reduced.
The concrete admixture can reduce or cancel the addition of a water reducing agent, a preservative and an air sealing agent under the condition of original proportion, greatly saves the construction cost of a project department, can be smoothly constructed in a tunnel water-rich area, and ensures safety and construction progress.
The existing additives have a lot of products, but the performance difference is large, the additives with different performances need to be used in different environments, and the existing additives have the technical problems of insufficient strength, large mixing amount, narrow application range, influence on the operation of the subsequent process and the like.
Disclosure of Invention
The invention provides an enhanced concrete nano additive and a preparation method thereof, which are used for solving the problems in the prior art that: the prior admixture has the technical problems of insufficient strength and high mixing amount.
The invention aims to provide an enhanced concrete nano additive, which comprises the following components in parts by weight:
80-90 parts of nanoscale silicon dioxide, 0.1-0.5 part of synthetic high-molecular tackifying material, 0.8-1.5 parts of sodium thiocyanate, 1-6 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.5-1.5 parts of carbamide, 0.1-1.2 parts of sodium nitrite, 0.5-1.5 parts of sodium nitrate, 1-5 parts of potassium aluminum sulfate dodecahydrate and 0.1-0.5 part of powdery defoaming agent.
In order to better realize the invention, the invention further comprises the following components in parts by weight:
83-89 parts of nano-scale silicon dioxide, 0.2-0.4 part of synthetic high-molecular tackifying material, 1.0-1.3 parts of sodium thiocyanate, 2-5 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.8-1.2 parts of carbamide, 0.5-1.0 part of sodium nitrite, 0.8-1.2 parts of sodium nitrate, 2-4 parts of potassium aluminum sulfate dodecahydrate and 0.1-0.3 part of powdery defoaming agent.
In order to better realize the invention, the invention further comprises the following components in parts by weight:
88.5 parts of nano-silicon dioxide, 0.3 part of synthetic high-molecular tackifying material, 1.2 parts of sodium thiocyanate, 4 parts of powdery polycarboxylic acid high-performance water reducing agent, 1 part of carbamide, 0.8 part of sodium nitrite, 1 part of sodium nitrate, 3 parts of aluminum potassium sulfate dodecahydrate and 0.2 part of powdery defoaming agent.
Further, the fluosilicate is magnesium fluosilicate or aluminum fluosilicate.
The second purpose of the invention is to provide a preparation method of the reinforced concrete nano additive, which comprises the following steps:
s1: placing the nanoscale silicon dioxide, the synthetic high-molecular tackifying material and the powdery polycarboxylic acid high-performance water reducing agent into a stirring device for first stirring and mixing to obtain first mixed powder;
s2: adding aluminum potassium sulfate dodecahydrate and a powder defoaming agent into the first mixed powder, and stirring the mixture by using a stirring device to react to obtain second mixed powder;
s3: and adding carbamide, sodium thiocyanate, sodium nitrite and barium nitrate into the second mixed powder, and stirring and reacting by a stirring device to obtain the enhanced concrete nano additive.
In order to better realize the invention, the stirring device comprises a stirring barrel, a stirring shaft and a driving motor, wherein an adjusting disc is arranged at the top of the stirring barrel, a first object placing barrel and a second object placing barrel are arranged above the adjusting disc, a first leakage hole and a second leakage hole are arranged in the adjusting disc, a first opening is arranged at the bottom of the first object placing barrel, and the first opening corresponds to the first leakage hole; a second opening is formed in the bottom of the second article holding barrel, and corresponds to the second leakage hole in position; a rotating plate is arranged in the adjusting disc and used for controlling the opening or closing of the first leak hole or the second leak hole so as to achieve the purposes of opening the first leak hole and closing the second leak hole or closing the first leak hole and opening the second leak hole, and the rotating plate is sleeved on the stirring shaft; the adjusting disc is also provided with a fixed block for preventing the rotating plate from doing circular motion.
To better implement the present invention, further, S1: and (2) placing the nanoscale silicon dioxide, the synthetic high-molecular tackifying material and the powdery polycarboxylic acid high-performance water reducing agent into the stirring barrel, and stirring and mixing for the first time under the driving of forward rotation of the driving motor, wherein the stirring reaction time is 10-20 minutes, and the stirring speed is 100-200 r/min, so as to obtain first mixed powder.
To better implement the present invention, further, S2: and step S1, after a first mixed powder is obtained through reaction, the aluminum potassium sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel, the driving motor is controlled to rotate reversely, the rotating plate rotates anticlockwise, the first leakage hole is opened, the second leakage hole is closed, the aluminum potassium sulfate dodecahydrate and the powder defoaming agent in the first storage barrel fall into the first mixed powder, stirring reaction is carried out for 2-8 minutes, and the stirring speed is 30-70 r/min, so that a second mixed powder is obtained.
To better implement the present invention, further, S3: after the second mixed powder is obtained through the reaction in the step S2, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into a second storage barrel, controlling the forward rotation of the driving motor to enable the rotating plate to rotate clockwise, so that the second leakage hole is opened, the first leakage hole is closed, the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel fall into the second mixed powder, the reaction stirring time is 10-15 minutes, and the stirring speed is 100-150 r/min.
The third purpose of the invention is to provide the reinforced concrete nano additive.
The fourth purpose of the invention is to provide the application of the reinforced concrete nano additive in the shotcrete.
The invention provides an enhanced concrete nano additive, which mainly comprises 80-90 parts of nano-scale silicon dioxide, 0.1-0.5 part of synthetic high-polymer tackifying material, 0.8-1.5 parts of sodium thiocyanate, 1-6 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.5-1.5 parts of carbamide, 0.1-1.2 parts of sodium nitrite, 0.5-1.5 parts of sodium nitrate, 1-5 parts of aluminum potassium sulfate dodecahydrate and 0.1-0.5 part of powdery defoaming agent.
Wherein, the nano-silicon dioxide is used as a main carrier material, is a mixture and has obvious tackifying and reinforcing effects; the synthetic high-molecular tackifying material is a high-molecular tackifier and mainly used for tackifying, sodium thiocyanate and carbamide can play a role in enhancing the strength of concrete, sodium nitrite mainly plays a role in resisting the corrosion of the environment to reinforced concrete, sodium nitrate mainly plays a role in resisting the corrosion of sulfate to concrete, aluminum potassium sulfate dodecahydrate has an obvious airtight effect, the potential safety hazard of tunnel gas is reduced, and a powder defoaming agent mainly eliminates harmful bubbles and reduces the influence on the strength of concrete.
The concrete nano additive is obtained by combining and proportioning the components, has the functions of reinforcement and corrosion resistance, and is also provided with a defoaming agent for preventing the influence of harmful gas in the preparation process.
The preparation method provided by the invention mainly comprises the steps of adding products with different properties in sections and fully stirring the products, wherein a special stirring device is adopted for stirring, and most of the materials are powdery and are easy to agglomerate and agglomerate in the mixing process, so that the finally obtained concrete nano additive product is unstable and uneven in performance, and the using effect of the product is seriously influenced.
In order to enable the stirring to be more sufficient, the stirring device is provided and comprises a stirring barrel, a stirring shaft and a driving motor, a first storage barrel and a second storage barrel are arranged above the stirring barrel, aluminum potassium sulfate dodecahydrate and a powder defoaming agent are placed in the first storage barrel, and carbonamide, sodium thiocyanate, sodium nitrite and barium nitrate are placed in the second storage barrel, wherein the first storage barrel is mainly used for eliminating bubbles, and the generated bubbles are mainly generated in the mixing process of the powder polycarboxylic acid high-performance water reducing agent through research. The reinforcing and anticorrosive properties that the thing bucket was placed to the second are through intensive mixing reaction back for the reinforcing of whole admixture and anticorrosive performance are abundant more even, are favorable to improving the comprehensive properties of enhancement mode concrete nanometer admixture.
In order to make the efficiency of the preparation method and the mixing effect better, the device is provided with the adjusting disc on the stirring barrel, the specific structure of the adjusting disc comprises a first leak hole and a second leak hole, a first article placing barrel is arranged above the first leak hole, the first leak hole is communicated with the bottom of the first article placing barrel, a second article placing barrel is arranged above the second leak hole, the second leak hole is communicated with the bottom of the second article placing barrel, and the rotating plate arranged on the adjusting disc controls the opening and closing of the first leak hole and the second leak hole or the closing of the first leak hole and the second leak hole, so that the purpose of adding the substances in the first article placing barrel or the substances in the second article placing barrel is achieved.
Because of the first material of putting in the thing bucket of putting adds earlier, the second is put the material of thing bucket and is added afterwards, consequently the further drive direction who has injectd driving motor of this device to reach and add the second after the material of putting in the thing bucket of putting in the first thing bucket of putting earlier and put the purpose of thing in the thing bucket.
The method is realized under the action of a driving motor by sleeving a rotating plate on a stirring shaft, and specifically, in a first stirring stage, a reaction is carried out by putting nanoscale silicon dioxide, a synthetic high-molecular tackifying material and a powdery polycarboxylic acid high-performance water reducing agent into a stirring barrel, and carrying out first stirring and mixing under the driving of forward rotation of the driving motor, wherein the stirring reaction time is 10-20 minutes, and the stirring speed is 100-200 r/min, so that first mixed powder is obtained.
And in the second stirring stage, after the first mixed powder is obtained through the reaction in the step S1, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel, the driving motor is controlled to rotate reversely, the rotating plate rotates anticlockwise, so that the first leakage hole is opened, the second leakage hole is closed, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent in the first storage barrel fall into the first mixed powder, and the second mixed powder is obtained through stirring reaction for 2-8 minutes at a stirring speed of 30-70 r/min.
And in the third stirring stage reaction, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into the second storage barrel, controlling the positive rotation of the driving motor to enable the rotating plate to rotate clockwise, so that the second leakage hole is opened, the first leakage hole is closed, and then the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel fall into the second mixed powder, wherein the reaction stirring time is 10-15 minutes, and the stirring speed is 100-150 r/min, so that the enhanced concrete nano additive is obtained.
In the invention, the stirring reaction time and the stirring speed of the second stirring stage are both shorter than those of the first stage and the third stage, mainly, the second stirring stage mainly defoams, and mainly, the stirring time is too long and the stirring speed is higher, so that the defoaming effect cannot be realized, and the gas content can be increased.
The embodiment of the invention has the beneficial effects that:
the concrete nano additive disclosed by the invention contains the reinforcing and tackifying materials, so that the performance of the concrete nano additive is more excellent, and the influence of harmful gas on the concrete nano additive in the manufacturing process is reduced by the defoaming agent.
According to the invention, the concrete nano additive is prepared by adopting a sectional stirring mode, the main materials are basically mixed in the first stirring stage, harmful gas is generated in the first stirring stage in the preparation process, and the harmful gas is removed by adding the defoaming agent and the like in the second stirring stage, so that the premise is provided for obtaining the concrete nano additive with excellent performance; and adding a reinforcing and tackifying material in the third stirring stage, and continuously stirring in a stirring device to fully and uniformly mix the materials so as to obtain the concrete nano additive.
The concrete nano additive prepared by the special formula, the special method and the special device has stronger tackifying property, so that the concrete and the sprayed operation surface have stronger cohesiveness, and the resilience is greatly reduced.
The preparation method provided by the invention is simple and easy to operate, but has strong effect and can improve the working efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a stirring apparatus according to the present invention;
FIG. 2 is a schematic view of a first construction of a rotating disk of the present invention;
fig. 3 is a second structural diagram of the rotating disk of the present invention.
Icon: 100-a stirring device, 110-a stirring barrel, 120-a stirring shaft, 130-a driving motor, 140-a regulating disc, 141-a first leak hole, 142-a second leak hole, 143-a rotating plate, 144-a fixed block, 151-a first storage barrel and 152-a second storage barrel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
Example 1:
the reinforced concrete nano additive comprises the following components in parts by weight:
80 parts of nano-scale silicon dioxide, 0.1 part of synthetic high-molecular tackifying material, 1.5 parts of sodium thiocyanate, 1 part of powdery polycarboxylic acid high-performance water reducing agent, 0.5 part of carbamide, 0.1 part of sodium nitrite, 0.5 part of sodium nitrate, 1 part of aluminum potassium sulfate dodecahydrate and 0.1 part of powdery defoaming agent.
Preparation method of enhanced concrete nano additive
S1: the nanoscale silicon dioxide, the synthetic polymer tackifying material and the powdery polycarboxylic acid high-performance water reducing agent are placed into the stirring barrel 110, and are stirred and mixed for the first time under the driving of the forward rotation of the driving motor 130, wherein the stirring reaction time is 10 minutes, and the stirring speed is 100r/min, so that first mixed powder is obtained.
S2: after the step S1 is performed to obtain first mixed powder, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel 151, the reverse rotation of the driving motor 130 is controlled, and the rotating plate 143 rotates counterclockwise, so that the first leaking hole 141 is opened, the second leaking hole 142 is closed, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent in the first storage barrel 151 fall into the first mixed powder, and the mixture is stirred and reacted for 2 minutes at a stirring speed of 30r/min to obtain second mixed powder.
S3: after the second mixed powder is obtained through the reaction in the step S2, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into the second storage barrel 152, controlling the driving motor 130 to rotate forward, so that the rotating plate 143 rotates clockwise, the second leakage hole 142 is opened, the first leakage hole 141 is closed, and then the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel 152 fall into the second mixed powder, wherein the reaction stirring time is 10 minutes, and the stirring speed is 100r/min, so as to obtain the enhanced concrete nano additive.
Wherein the stirring device 100: the stirring device comprises a stirring barrel 110, a stirring shaft 120 and a driving motor 130, wherein an adjusting disc 140 is arranged at the top of the stirring barrel 110, a first object placing barrel 151 and a second object placing barrel 152 are arranged above the adjusting disc 140, a first leakage hole 141 and a second leakage hole 142 are arranged in the adjusting disc 140, a first opening is formed in the bottom of the first object placing barrel 151, and the first opening corresponds to the first leakage hole 141 in position; a second opening is formed in the bottom of the second storage barrel 152, and the second opening corresponds to the second leakage hole 142; a rotating plate 143 is arranged in the adjusting disc 140, the rotating plate 143 is used for controlling the opening or closing of the first leak hole 141 or the second leak hole 142, so as to achieve the purpose that the first leak hole 141 is opened, the second leak hole 142 is closed, or the first leak hole 141 is closed and the second leak hole 142 is opened, and the rotating plate 143 is sleeved on the stirring shaft 120; the adjustment plate 140 is further provided with a fixing block 144 for preventing the rotation plate 143 from making a circular motion.
Example 2:
an enhanced concrete nano additive comprises 89 parts of nano-silicon dioxide, 0.2 part of synthetic high-molecular tackifying material, 1.0 part of sodium thiocyanate, 2 parts of powdery polycarboxylic acid high-performance water reducing agent, 1.2 parts of carbamide, 0.5 part of sodium nitrite, 1.2 parts of sodium nitrate, 2 parts of aluminum potassium sulfate dodecahydrate and 0.1 part of powdery defoaming agent.
Preparation method of enhanced concrete nano additive
S1: the nanoscale silicon dioxide, the synthetic polymer tackifying material and the powdery polycarboxylic acid high-performance water reducing agent are placed into the stirring barrel 110, and are stirred and mixed for the first time under the driving of the forward rotation of the driving motor 130, wherein the stirring reaction time is 12 minutes, and the stirring speed is 120r/min, so that first mixed powder is obtained.
S2: after the step S1 is performed to obtain first mixed powder, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel 151, the reverse rotation of the driving motor 130 is controlled, and the rotating plate 143 rotates counterclockwise, so that the first leaking hole 141 is opened, the second leaking hole 142 is closed, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent in the first storage barrel 151 fall into the first mixed powder, and the second mixed powder is obtained after stirring reaction for 4 minutes at a stirring speed of 40 r/min.
S3: after the second mixed powder is obtained through the reaction in the step S2, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into the second storage barrel 152, controlling the driving motor 130 to rotate forward, so that the rotating plate 143 rotates clockwise, the second leakage hole 142 is opened, the first leakage hole 141 is closed, and then the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel 152 fall into the second mixed powder, wherein the reaction stirring time is 11 minutes, and the stirring speed is 12r/min, so as to obtain the enhanced concrete nano additive.
The stirring device 100 is the same as in example 1.
Example 3:
88.5 parts of nano-scale silicon dioxide, 0.3 part of synthetic polymer tackifying material, 1.2 parts of sodium thiocyanate, 4 parts of powdery polycarboxylic acid high-performance water reducing agent, 1 part of carbamide, 0.8 part of sodium nitrite, 1 part of sodium nitrate, 3 parts of aluminum potassium sulfate dodecahydrate and 0.2 part of powdery defoaming agent.
Preparation method of enhanced concrete nano additive
S1: the nanoscale silicon dioxide, the synthetic polymer tackifying material and the powdery polycarboxylic acid high-performance water reducing agent are placed into the stirring barrel 110, and are stirred and mixed for the first time under the driving of the forward rotation of the driving motor 130, wherein the stirring reaction time is 15 minutes, and the stirring speed is 150r/min, so that first mixed powder is obtained.
S2: after the step S1 is performed to obtain first mixed powder, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel 151, the reverse rotation of the driving motor 130 is controlled, and the rotating plate 143 rotates counterclockwise, so that the first leaking hole 141 is opened, the second leaking hole 142 is closed, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent in the first storage barrel 151 fall into the first mixed powder, and the second mixed powder is obtained after stirring reaction for 5 minutes at a stirring speed of 50 r/min.
S3: after the second mixed powder is obtained through the reaction in the step S2, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into the second storage barrel 152, controlling the driving motor 130 to rotate forward, so that the rotating plate 143 rotates clockwise, the second leakage hole 142 is opened, the first leakage hole 141 is closed, and then the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel 152 fall into the second mixed powder, wherein the reaction stirring time is 12 minutes, and the stirring speed is 120r/min, so as to obtain the enhanced concrete nano additive.
The stirring device 100 is the same as in example 1.
Example 4:
an enhanced concrete nano additive, 83 parts of nano-silicon dioxide, 0.4 part of synthetic polymer tackifying material, 1.3 parts of sodium thiocyanate, 5 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.8 part of carbamide, 1.0 part of sodium nitrite, 0.8 part of sodium nitrate, 4 parts of aluminum potassium sulfate dodecahydrate and 0.3 part of powdery defoaming agent.
Preparation method of enhanced concrete nano additive
S1: the nanoscale silicon dioxide, the synthetic polymer tackifying material and the powdery polycarboxylic acid high-performance water reducing agent are placed into the stirring barrel 110, and are stirred and mixed for the first time under the driving of the forward rotation of the driving motor 130, wherein the stirring reaction time is 18 minutes, and the stirring speed is 180r/min, so that first mixed powder is obtained.
S2: after the step S1 is performed to obtain first mixed powder, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel 151, the reverse rotation of the driving motor 130 is controlled, and the rotating plate 143 rotates counterclockwise, so that the first leaking hole 141 is opened, the second leaking hole 142 is closed, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent in the first storage barrel 151 fall into the first mixed powder, and the second mixed powder is obtained after stirring reaction for 6 minutes at a stirring speed of 60 r/min.
S3: after the second mixed powder is obtained through the reaction in the step S2, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into the second storage barrel 152, controlling the driving motor 130 to rotate forward, so that the rotating plate 143 rotates clockwise, the second leakage hole 142 is opened, the first leakage hole 141 is closed, and then the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel 152 fall into the second mixed powder, wherein the reaction stirring time is 14 minutes, and the stirring speed is 140r/min, so as to obtain the enhanced concrete nano additive.
The stirring device 100 is the same as in example 1.
Example 5:
90 parts of nano-scale silicon dioxide, 0.5 part of synthetic polymer tackifying material, 0.8 part of sodium thiocyanate, 6 parts of powdery polycarboxylic acid high-performance water reducing agent, 1.5 parts of carbamide, 1.2 parts of sodium nitrite, 1.5 parts of sodium nitrate, 5 parts of aluminum potassium sulfate dodecahydrate and 0.5 part of powdery defoaming agent.
Preparation method of enhanced concrete nano additive
S1: the nanoscale silicon dioxide, the synthetic high-molecular tackifying material and the powdery polycarboxylic acid high-performance water reducing agent are placed into the stirring barrel 110, and are stirred and mixed for the first time under the driving of the forward rotation of the driving motor 130, wherein the stirring reaction time is 20 minutes, and the stirring speed is 200r/min, so that first mixed powder is obtained.
S2: after the step S1 is performed to obtain first mixed powder, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel 151, the reverse rotation of the driving motor 130 is controlled, and the rotating plate 143 rotates counterclockwise, so that the first leaking hole 141 is opened, the second leaking hole 142 is closed, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent in the first storage barrel 151 fall into the first mixed powder, and the mixture is stirred and reacted for 8 minutes at a stirring speed of 70r/min to obtain second mixed powder.
S3: after the second mixed powder is obtained through the reaction in the step S2, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into the second storage barrel 152, controlling the driving motor 130 to rotate forward, so that the rotating plate 143 rotates clockwise, the second leakage hole 142 is opened, the first leakage hole 141 is closed, and then the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel 152 fall into the second mixed powder, wherein the reaction stirring time is 15 minutes, and the stirring speed is 150r/min, so as to obtain the enhanced concrete nano additive.
The stirring device 100 is the same as in example 1.
Comparative example 1:
a concrete nanometer additive, 82 parts of nanometer silicon dioxide, 0.4 part of synthetic polymer tackifying material, 0.99 part of sodium thiocyanate, 5 parts of powdery polycarboxylic acid high-performance water reducing agent, 1.2 parts of carbamide, 0.8 part of sodium nitrite, 1 part of sodium nitrate, 2 parts of aluminum potassium sulfate dodecahydrate and 0.4 part of powdery defoaming agent.
The preparation method of the enhanced concrete nano additive comprises the following steps: and (3) putting the materials into a stirring barrel, and driving a stirring shaft through a driving motor to perform stirring reaction for 30 minutes to obtain the concrete nano additive.
Comparative example 2:
an enhanced concrete nano additive comprises 70 parts of nano-silicon dioxide, 0.7 part of synthetic high-molecular tackifying material, 0.2 part of sodium thiocyanate, 10 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.1 part of carbamide, 2 parts of sodium nitrite and 5 parts of sodium nitrate.
The preparation method of the enhanced concrete nano additive comprises the following steps:
s1: and (2) placing the nanoscale silicon dioxide, the synthetic high-molecular tackifying material and the powdery polycarboxylic acid high-performance water reducing agent into the stirring barrel, and stirring and mixing for the first time under the driving of the forward rotation of the driving motor, wherein the stirring reaction time is 18 minutes, and the stirring speed is 180r/min, so as to obtain first mixed powder.
S2: and step S1, after the first mixed powder is obtained through reaction, putting carbamide, sodium thiocyanate, sodium nitrite and barium nitrate into the second mixed powder, and stirring for 14 minutes at a stirring speed of 140r/min to obtain the concrete nano additive.
Comparative example 3:
95 parts of nano-scale silicon dioxide, 0.7 part of synthetic high-molecular tackifying material, 0.9 part of sodium thiocyanate, 2 parts of powdery polycarboxylic acid high-performance water reducing agent, 1 part of carbamide, 0.1 part of sodium nitrate and 1.5 parts of powdery defoaming agent.
The preparation method of the enhanced concrete nano additive comprises the following steps:
s1: the nanoscale silicon dioxide, the synthetic polymer tackifying material and the powdery polycarboxylic acid high-performance water reducing agent are placed into the stirring barrel 110, and are stirred and mixed for the first time under the driving of the forward rotation of the driving motor 130, wherein the stirring reaction time is 30 minutes, and the stirring speed is 180r/min, so that first mixed powder is obtained.
S2: after the step S1 is performed to obtain first mixed powder, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel 151, the reverse rotation of the driving motor 130 is controlled, and the rotating plate 143 rotates counterclockwise, so that the first leaking hole 141 is opened, the second leaking hole 142 is closed, the potassium aluminum sulfate dodecahydrate and the powder defoaming agent in the first storage barrel 151 fall into the first mixed powder, and the second mixed powder is obtained after stirring reaction for 30 minutes at a stirring speed of 100 r/min.
S3: and step S2, after second mixed powder is obtained through reaction, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into the second storage barrel 152, controlling the driving motor 130 to rotate positively, so that the rotating plate 143 rotates clockwise, the second leakage hole 142 is opened, the first leakage hole 141 is closed, and then the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel 152 fall into the second mixed powder, wherein the reaction stirring time is 20 minutes, and the stirring speed is 140r/min, so that the concrete nano additive is obtained.
Description of the experiment:
the above examples 1 to 5 and comparative examples 1 to 3 were subjected to performance test:
test materials: the cement adopts standard cement meeting the specification of GB 8076-.
The test method comprises the following steps: the testing is carried out by using the admixtures prepared in experimental examples 1-5 and comparative examples 1-3, the mixing amount is 5-8%, and simultaneously, 6.0% of high-quality self-made alkali-free liquid accelerator is added in the experiments;
the test results were as follows:
in conclusion, the additive provided by the invention has obvious improvement on compressive strength and corrosion resistance.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. An enhanced concrete nano additive is characterized in that: the adhesive comprises the following components in parts by weight:
80-90 parts of nanoscale silicon dioxide, 0.1-0.5 part of synthetic high-molecular tackifying material, 0.8-1.5 parts of sodium thiocyanate, 1-6 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.5-1.5 parts of carbamide, 0.1-1.2 parts of sodium nitrite, 0.5-1.5 parts of sodium nitrate, 1-5 parts of potassium aluminum sulfate dodecahydrate and 0.1-0.5 part of powdery defoaming agent;
the preparation method of the enhanced concrete nano additive comprises the following steps:
s1: placing the nanoscale silicon dioxide, the synthetic high-molecular tackifying material and the powdery polycarboxylic acid high-performance water reducing agent into a stirring device for first stirring and mixing to obtain first mixed powder;
s2: adding aluminum potassium sulfate dodecahydrate and a powder defoaming agent into the first mixed powder, and stirring the mixture by using a stirring device to react to obtain second mixed powder;
s3: and adding carbamide, sodium thiocyanate, sodium nitrite and barium nitrate into the second mixed powder, and stirring and reacting by a stirring device to obtain the enhanced concrete nano additive.
2. The reinforced concrete nanoadmixture of claim 1, wherein: the adhesive comprises the following components in parts by weight:
83-89 parts of nano-scale silicon dioxide, 0.2-0.4 part of synthetic high-molecular tackifying material, 1.0-1.3 parts of sodium thiocyanate, 2-5 parts of powdery polycarboxylic acid high-performance water reducing agent, 0.8-1.2 parts of carbamide, 0.5-1.0 part of sodium nitrite, 0.8-1.2 parts of sodium nitrate, 2-4 parts of potassium aluminum sulfate dodecahydrate and 0.1-0.3 part of powdery defoaming agent.
3. The reinforced concrete nanoadmixture of claim 1, wherein: the adhesive comprises the following components in parts by weight:
88.5 parts of nano-silicon dioxide, 0.3 part of synthetic high-molecular tackifying material, 1.2 parts of sodium thiocyanate, 4 parts of powdery polycarboxylic acid high-performance water reducing agent, 1 part of carbamide, 0.8 part of sodium nitrite, 1 part of sodium nitrate, 3 parts of aluminum potassium sulfate dodecahydrate and 0.2 part of powdery defoaming agent.
4. The reinforced concrete nanoadmixture of claim 1, wherein: the stirring device in the preparation method of the enhanced concrete nano additive comprises a stirring barrel, a stirring shaft and a driving motor, wherein an adjusting disc is arranged at the top of the stirring barrel, a first object placing barrel and a second object placing barrel are arranged above the adjusting disc, a first leakage hole and a second leakage hole are formed in the adjusting disc, a first opening is formed in the bottom of the first object placing barrel, and the first opening corresponds to the first leakage hole in position; a second opening is formed in the bottom of the second article holding barrel, and corresponds to the second leakage hole in position; a rotating plate is arranged in the adjusting disc and used for controlling the opening or closing of the first leak hole or the second leak hole so as to achieve the purposes of opening the first leak hole, closing the second leak hole or closing the first leak hole and opening the second leak hole, and the rotating plate is sleeved on the stirring shaft; the adjusting disc is also provided with a fixed block for preventing the rotating plate from doing circular motion.
5. The reinforced concrete nanoadmixture of claim 4, wherein:
s1: and (2) placing the nanoscale silicon dioxide, the synthetic high-molecular tackifying material and the powdery polycarboxylic acid high-performance water reducing agent into the stirring barrel, and stirring and mixing for the first time under the driving of forward rotation of the driving motor, wherein the stirring reaction time is 10-20 minutes, and the stirring speed is 100-200 r/min, so as to obtain first mixed powder.
6. The reinforced concrete nanoadmixture of claim 5, wherein:
s2: and step S1, after a first mixed powder is obtained through reaction, the aluminum potassium sulfate dodecahydrate and the powder defoaming agent are placed into the first storage barrel, the driving motor is controlled to rotate reversely, the rotating plate rotates anticlockwise, the first leakage hole is opened, the second leakage hole is closed, the aluminum potassium sulfate dodecahydrate and the powder defoaming agent in the first storage barrel fall into the first mixed powder, stirring reaction is carried out for 2-8 minutes, and the stirring speed is 30-70 r/min, so that a second mixed powder is obtained.
7. The reinforced concrete nanoadmixture of claim 6, wherein:
s3: after the second mixed powder is obtained through the reaction in the step S2, putting the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate into a second storage barrel, controlling the forward rotation of the driving motor to enable the rotating plate to rotate clockwise, so that the second leakage hole is opened, the first leakage hole is closed, the carbamide, the sodium thiocyanate, the sodium nitrite and the barium nitrate in the second storage barrel fall into the second mixed powder, the reaction stirring time is 10-15 minutes, and the stirring speed is 100-150 r/min.
8. Use of the reinforced concrete nanoadmixture according to any one of claims 1 to 7 in shotcrete.
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| CN102826774A (en) * | 2012-09-17 | 2012-12-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Nanoscale sprayed concrete modified-admixture |
| CN103664034A (en) * | 2013-11-15 | 2014-03-26 | 交通运输部公路科学研究所 | Liquid accelerator for sprayed concrete and preparation method and application thereof |
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| JP2599181B2 (en) * | 1988-07-11 | 1997-04-09 | 株式会社青木建設 | Water stopping and strengthening method for tunnel concrete |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826774A (en) * | 2012-09-17 | 2012-12-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Nanoscale sprayed concrete modified-admixture |
| CN103664034A (en) * | 2013-11-15 | 2014-03-26 | 交通运输部公路科学研究所 | Liquid accelerator for sprayed concrete and preparation method and application thereof |
| CN204735533U (en) * | 2015-05-31 | 2015-11-04 | 湖南化工职业技术学院 | Heavy metal contaminated soil treatment facility |
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