CN113716890A - Compound concrete retarding and water reducing agent and production method and application thereof - Google Patents
Compound concrete retarding and water reducing agent and production method and application thereof Download PDFInfo
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- CN113716890A CN113716890A CN202111108735.2A CN202111108735A CN113716890A CN 113716890 A CN113716890 A CN 113716890A CN 202111108735 A CN202111108735 A CN 202111108735A CN 113716890 A CN113716890 A CN 113716890A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 239000004567 concrete Substances 0.000 title claims abstract description 85
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 48
- 150000001875 compounds Chemical class 0.000 title claims abstract description 26
- 230000000979 retarding effect Effects 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 35
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000012452 mother liquor Substances 0.000 claims abstract description 30
- 235000013379 molasses Nutrition 0.000 claims abstract description 28
- 239000002253 acid Substances 0.000 claims abstract description 27
- 229920001661 Chitosan Polymers 0.000 claims abstract description 26
- 239000002270 dispersing agent Substances 0.000 claims abstract description 20
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 15
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 23
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 16
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 11
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 11
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 10
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 claims description 8
- 229930003268 Vitamin C Natural products 0.000 claims description 8
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 claims description 8
- 235000019154 vitamin C Nutrition 0.000 claims description 8
- 239000011718 vitamin C Substances 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 5
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 5
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 22
- 230000036571 hydration Effects 0.000 abstract description 9
- 238000006703 hydration reaction Methods 0.000 abstract description 9
- 150000001732 carboxylic acid derivatives Chemical class 0.000 abstract description 5
- 230000002829 reductive effect Effects 0.000 abstract description 5
- 239000012744 reinforcing agent Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 33
- 239000000463 material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011372 high-strength concrete Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 229920005646 polycarboxylate Polymers 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000008030 superplasticizer Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
- 230000002195 synergetic effect Effects 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/166—Macromolecular compounds comprising sulfonate or sulfate groups obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention relates to a compound concrete retarding water reducing agent and a production method and application thereof, wherein the water reducing agent comprises, by mass, 55-65 parts of polycarboxylic acid water reducing mother liquor, 25-35 parts of polycarboxylic acid slump retaining mother liquor, 2-5 parts of chitosan, 2-6 parts of molasses, 0.5-0.8 part of nano silicon dioxide particles, 0.4-0.8 part of dispersing agent and the balance of water. The carboxylic acid water-reducing mother liquor and the polycarboxylic acid slump-retaining mother liquor are compounded, molasses and chitosan are used as retarding components, the initial hydration of cement is strongly inhibited, so that free water is increased, the fluidity of cement paste is increased, the viscosity is reduced, the expansibility is improved, in addition, nano silicon dioxide particles are introduced as a structural reinforcing agent, the nano silicon dioxide particles are well dispersed among concrete particle structures through a dispersing agent and effectively combined with the concrete particle structures to form a molecular structure with extremely high stability, and further, the compressive strength of the concrete is further improved.
Description
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to a compound concrete retarding and water reducing agent, and a production method and application thereof.
Background
With the rapid development of modern buildings and material industries, modern buildings tend to be high-rise, light-weight and large-span, and high-strength concrete is widely applied, however, the concrete usually adopts a large amount of cementing materials, reinforcing materials and a low water-cement ratio to realize high strength, so that the problems of high viscosity and low flow rate of fresh concrete are easily caused, the phenomena of pipe blockage, pump blockage and the like are caused, and further, the problem of high viscosity of high-strength concrete is serious in China, the construction difficulty is high, and engineering accidents are frequent. Therefore, it is very important to research and develop an admixture which can not only meet the water reduction of high-strength concrete, but also reduce the viscosity of the high-strength concrete to a certain extent and improve the fluidity of the concrete.
The polycarboxylate superplasticizer is a concrete admixture which is widely researched and applied at present, and under the condition that the workability of concrete is not changed, the polycarboxylate superplasticizer is added, so that the cement consumption can be effectively saved, the water consumption can be reduced, and the concrete strength can be improved, therefore, the polycarboxylate superplasticizer also becomes an important concrete admixture in the present market.
Under general conditions, the setting time of concrete is controlled to be 8-10h, the setting time of concrete can be adjusted to be 20-60h, after the slow-setting polycarboxylate superplasticizer is added, the setting time of concrete in each layer can be coordinated, the joint of layered pouring can be eliminated, hydration heat release can be greatly slowed down, the fluidity of cement paste is improved, and the viscosity of the cement paste can be reduced.
Therefore, we propose a compound concrete retarding water reducing agent and a production method and application thereof.
Disclosure of Invention
The invention aims to solve the problems and provides a compound concrete retarding and water reducing agent, a production method and application thereof.
The invention realizes the purpose through the following technical scheme:
the compound concrete retarding and water reducing agent comprises, by mass, 55-65 parts of polycarboxylic acid water reducing mother liquor, 25-35 parts of polycarboxylic acid slump retaining mother liquor, 2-5 parts of chitosan, 2-6 parts of molasses, 0.5-0.8 part of nano silicon dioxide particles, 0.4-0.8 part of a dispersing agent and the balance of water.
As a further optimized scheme of the invention, the dispersing agent is sodium hexametaphosphate or sodium tripolyphosphate.
As a further optimized scheme of the invention, the polycarboxylic acid water-reducing mother liquor is prepared from the following raw materials in percentage by weight: 40-45% of unsaturated polyoxyethylene ether, 10-15% of acrylic acid, 0.2-0.6% of sodium methallyl sulfonate, 0.3-0.5% of hydrogen peroxide, 0.7-1.1% of vitamin C and the balance of water.
As a further optimization scheme of the invention, the polycarboxylic acid slump-retaining mother liquor is prepared from the following raw materials in percentage by weight: 40-45% of unsaturated polyoxyethylene ether, 10-15% of acrylic acid, 0.3-0.6% of maleic anhydride, 0.2-0.6% of thioglycolic acid, 0.3-0.5% of hydrogen peroxide, 0.5-0.8% of vitamin C and the balance of water.
The production method of the compound concrete retarding and water reducing agent mainly comprises the following steps:
(1) adding a certain amount of water into a reaction kettle, accurately weighing chitosan and molasses with required dosage according to the component proportion of the water reducing agent, and stirring and dissolving to obtain a solution A;
(2) accurately weighing the polycarboxylic acid water reducing mother liquor and the polycarboxylic acid slump retaining mother liquor with required dosage according to the component proportion of the water reducing agent, and stirring and mixing to obtain a solution B;
(3) controlling the temperature of the reaction kettle at 30 ℃, putting the solution B into the reaction kettle, stirring and mixing the solution B with the solution A, adding the required amount of the dispersant and the nano silicon dioxide particles, stirring and mixing uniformly, and preserving heat for 1-1.5 hours to obtain the compound concrete retarding and water reducing agent.
As a further optimization scheme of the invention, in the step (3), the solid content of the compound concrete retarding and water reducing agent is 40%.
An application of the compound concrete retarding and water reducing agent in preparing ultra-high pumping concrete.
Retarding mechanism of action of molasses
The molasses has strong solid-liquid surface activity, so that the molasses can be adsorbed on the surface of cement mineral particles to form a solvated adsorption layer to prevent the particles from contacting and coagulating, thereby destroying the flocculation structure of the cement, enabling the initial hydration calcium of the cement to contain a plurality of hydroxyl groups, having strong inhibiting effect on the initial hydration of the cement, increasing the free water and improving the fluidity of cement paste.
The invention has the beneficial effects that:
1. the invention compounds the carboxylic acid water-reducing mother liquor and the polycarboxylic acid slump-retaining mother liquor, takes molasses and chitosan as retarding components, and explores that when the addition ratio of molasses and chitosan is 1:2, the molasses and chitosan are doped into concrete, so that the setting time of the concrete is prolonged, and the concrete has better retarding effect, because molasses can be adsorbed on the surface of cement mineral particles to form a solvation adsorption layer, the initial hydration of cement is stronger inhibited, free water is increased, the fluidity of cement paste is also increased, and further, the expansibility is improved, in addition, chitosan is doped according to the addition ratio of 1:2, so that hydroxyl groups contained in the structure of chitosan are completely associated with hydrogen bonds between free water, a layer of stable water film is formed on the surface of water particles, and the contact between cement particles is further prevented, the hydration is prevented, and the coagulation time is further prolonged;
2. the invention compounds the carboxylic acid water-reducing mother liquor and the polycarboxylic acid slump-retaining mother liquor, adds the nano silicon dioxide particles as the structural reinforcing agent into the component formula, the nano silicon dioxide particles have spherical microstructure and are flocculent and reticular quasi-particle structures, and after being added into the water reducing agent component formula, after the water reducing agent is doped into concrete, the water reducing agent is mutually associated with the concrete particle structure to form a molecular structure with extremely high stability, further being beneficial to improving the compressive strength of concrete, and in addition, when sodium tripolyphosphate is explored and obtained as a dispersing agent, has better synergistic effect with the nano silicon dioxide particles, can well disperse the nano silicon dioxide particles among concrete particle structures, so that the nano silicon dioxide particles and the concrete particle structure can be effectively combined to form a molecular structure with extremely high stability, and the compressive strength of the concrete is further improved.
Detailed Description
The present application is described in further detail below, and it should be noted that the following detailed description is provided for illustrative purposes only, and is not intended to limit the scope of the present application, which is defined by the appended claims.
A production method of a compound concrete retarding and water reducing agent comprises the following steps,
(1) preparing a carboxylic acid water reducing mother liquor, mixing 0.3-0.5% of hydrogen peroxide, 0.7-1.1% of vitamin C and water according to weight percentage to prepare an aqueous solution, recording as a material a, then mixing 0.2-0.6% of sodium methallyl sulfonate, 10-15% of acrylic acid and water to prepare an aqueous solution, recording as a material b, adding 40-45% of unsaturated polyoxyethylene ether and water into a reaction kettle, stirring until the unsaturated polyoxyethylene ether and the water are dissolved, uniformly stirring, heating to 50-60 ℃, simultaneously dropwise adding the material a and the material b, keeping the temperature constant, keeping the temperature to continue reacting for 2-3 hours after the materials are added, and neutralizing the pH value to 7-9 to obtain a polycarboxylic acid series water reducing agent mother liquor;
(2) preparing a polycarboxylic acid slump retaining mother solution, adding 40-45% of unsaturated polyoxyethylene ether and water into a reaction kettle according to the weight percentage, stirring and dissolving, heating to 50-60 ℃, adding 0.3-0.5% of hydrogen peroxide, 10-15% of acrylic acid, 0.3-0.6% of maleic anhydride and water, and uniformly stirring to prepare a solution I;
then, 0.2-0.6% of thioglycolic acid, 0.5-0.8% of vitamin C and water are uniformly stirred to prepare a solution II;
sequentially dripping the solution I and the solution II into the reaction kettle, controlling the reaction temperature to be 55-65 ℃, and dripping the unsaturated polyoxyethylene ether monomer aqueous solution into the solution II in advance for 5-15min compared with the solution I, wherein the mass ratio of the solution I to the solution II is (290) plus 310 to (25-35) to (1.5-2.5);
after the reaction is finished, keeping the temperature constant for 1-3 hours, then cooling to below 40 ℃, and adjusting the pH value of the solution to 5-7 to obtain polycarboxylic acid slump-retaining mother liquor;
(3) adding a certain amount of water into a reaction kettle, accurately weighing 2-5 parts of chitosan and 2-6 parts of molasses according to the component proportion of the water reducing agent, and stirring for dissolving to obtain a solution A;
(4) accurately weighing 55-65 parts of polycarboxylic acid water reducing mother liquor and 25-35 parts of polycarboxylic acid slump retaining mother liquor according to the component proportion of the water reducing agent, and stirring and mixing to obtain solution B;
(5) controlling the temperature of the reaction kettle to be 30 ℃, putting the solution B into the reaction kettle, stirring and mixing the solution B with the solution A, simultaneously adding 0.4-0.8 part of dispersant and 0.5-0.8 part of nano silicon dioxide particles in required amount, stirring and mixing uniformly, and keeping the temperature for 1-1.5h to obtain the compound concrete retarding and water reducing agent, wherein the dispersant is sodium hexametaphosphate or sodium tripolyphosphate.
Example 1
The embodiment provides a production method of a compound concrete retarding and water reducing agent, which mainly comprises the following steps:
(1) preparing carboxylic acid water reducing mother liquor, mixing 0.4% of hydrogen peroxide, 0.9% of vitamin C and water according to mass percentage to prepare aqueous solution, recording as material a, then mixing 0.4% of sodium methallyl sulfonate, 15% of acrylic acid and water to prepare aqueous solution, recording as material b, adding 45% of unsaturated polyoxyethylene ether and water into a reaction kettle, stirring until the mixture is dissolved, heating to 55 ℃ after uniformly stirring, simultaneously dropwise adding the material a and the material b, keeping the temperature constant, keeping the temperature for continuous reaction for 2-3 hours after the addition is finished, and neutralizing the pH value to 7 to obtain polycarboxylic acid water reducing agent mother liquor;
(2) preparing a polycarboxylic acid slump retaining mother solution, adding 45% of unsaturated polyoxyethylene ether and water into a reaction kettle according to the mass percentage, stirring and dissolving, heating to 5 ℃, adding 0.4% of hydrogen peroxide, 15% of acrylic acid, 0.45% of maleic anhydride and water, and uniformly stirring to prepare a solution I;
then, 0.4% of thioglycolic acid, 0.65% of vitamin C and water are uniformly stirred to prepare a solution II;
sequentially dropwise adding the solution I and the solution II into the reaction kettle, controlling the reaction temperature to be 60 ℃, and dropwise adding the unsaturated polyoxyethylene ether monomer aqueous solution into the solution II for 10min in advance of the solution I, wherein the mass ratio of the solution I to the solution II is 300:30: 2;
and (3) after the reaction is finished, keeping the temperature constant for 1.5h, then cooling to below 40 ℃, and adjusting the pH value of the solution to 7 to obtain the polycarboxylic acid slump-retaining mother liquor.
(3) Adding a certain amount of water into a reaction kettle, accurately weighing 2 parts of chitosan and 2 parts of molasses according to the component proportion of the water reducing agent, and stirring and dissolving to obtain a solution A;
(4) accurately weighing 60 parts of polycarboxylic acid water-reducing mother liquor and 30 parts of polycarboxylic acid slump-retaining mother liquor according to the component proportion of the water reducing agent, and stirring and mixing to obtain solution B;
(5) controlling the temperature of the reaction kettle at 30 ℃, putting the solution B into the reaction kettle, stirring and mixing the solution B with the solution A, simultaneously adding 0.6 part of dispersant and 0.65 part of nano silicon dioxide particles in required amount, stirring and mixing uniformly, and keeping the temperature for 1.5h to obtain the compound concrete retarding and water reducing agent, wherein the dispersant is sodium hexametaphosphate.
Example 2
The difference from the example 1 is that 2 parts of chitosan and 4 parts of molasses.
Example 3
The difference from the example 1 is that 2 parts of chitosan and 6 parts of molasses;
example 4
The difference from the example 1 is that 0 part of chitosan and 2 parts of molasses;
example 5
The difference from the example 1 is that 2 parts of chitosan and 0 part of molasses;
example 6
The difference from the example 2 is that the nano silicon dioxide particle is 0 part;
example 7
The difference from example 2 is that the dispersant is sodium tripolyphosphate;
example 8
The difference from example 6 is that the dispersant is sodium tripolyphosphate.
In order to verify the influence of different addition ratios of chitosan and molasses on the application performance of concrete, a common concrete water reducing agent purchased from the market is used as a control group, concrete water reducing agents prepared according to different component formulas provided in the above examples 1-5 are used as experimental groups, the concrete water reducing agents of the control group and 5 experimental groups are mixed with concrete at the same addition amount to obtain 6 groups of freshly mixed concrete samples, and the 6 groups of freshly mixed concrete samples are tested for water reducing rate, setting time, expansibility and compressive strength, and the results are shown in table 1:
TABLE 1 Effect of different addition ratios of chitosan and molasses on concrete application Performance
As can be seen from Table 1, the water-reducing agents for concrete prepared by using the formulations of different components according to examples 1 to 3 above have advantages in water-reducing rate, setting time and expandability compared with the general concrete available on the market, and specifically,
in examples 4 to 5, when chitosan alone or molasses alone was added, the water-reducing rate of the concrete was lower than that of the other examples and the control group, the setting time and the expansibility were lower than those of examples 1 to 3, and the water-reducing rate was higher than that of the control group, which indicates that the use of chitosan alone or molasses alone had no positive effect on the improvement of the water-reducing rate of the concrete, but the effect of the introduction of chitosan alone or molasses alone on the setting time and the expansibility was improved compared with that of the control group;
in example 3, when the ratio of chitosan to molasses was 1:3, the water-reducing rate was higher than that of the other examples and the control, but the setting time and the expansibility were lower than those of example 2 because molasses could be adsorbed on the surface of cement mineral particles to form a solvated adsorption layer, which has a strong inhibition effect on the initial hydration of cement, and when the ratio of chitosan to molasses was 1:2, the setting time of concrete was prolonged and the concrete had a good retardation effect because molasses could be adsorbed on the surface of cement mineral particles to form a solvated adsorption layer, which has a strong inhibition effect on the initial hydration of cement, increasing free water, increasing the fluidity of cement paste, and further improving the expansibility, and chitosan was added at a ratio of 1:2, the hydroxyl groups contained in the structure of the chitosan are completely associated with the hydrogen bonds between the free water and the water, so that a layer of stable water film is formed on the surface of the water particles, the contact between the cement particles is further prevented, the hydration of the cement particles is prevented, and the setting time is further prolonged.
In addition, in examples 1 to 5, in order to further verify the influence of the nano-silica particles and different dispersant types on the application performance of the concrete, common concrete water reducers purchased from the market are used as a control group, concrete water reducers prepared according to different component formulas provided in the above examples 2 and 6 to 8 are used as experimental groups, the concrete water reducers of the control group and the concrete water reducers of 4 experimental groups are blended with the concrete in the same addition amount to obtain 5 groups of newly blended concrete samples, and the water reduction rate, setting time, expansibility and compressive strength of the 5 groups of newly blended concrete samples are tested, and the results are shown in table 2;
TABLE 2 influence of Nano-silica particles with different dispersant types on concrete application Properties
As can be seen from Table 2, the concrete water reducing agents prepared by the different component formulas described in examples 2, 6-8 have no significant influence on the water reducing rate, setting time and expansibility of concrete when being blended into the concrete;
in example 6, when the nano silica particles are 0 part in the formulation, the compressive strength of the concrete sample obtained after the nano silica particles are mixed into the concrete is reduced compared with that of example 2;
in example 8, compared to example 6, when sodium tripolyphosphate is used as the dispersant, the compressive strength of the concrete sample obtained after the sodium tripolyphosphate is mixed into the concrete is reduced compared to example 2, because the microstructure of the nano-silica particles is spherical and is a quasi-particle structure in a flocculent and reticular form, and after the nano-silica particles are added into the water reducing agent component formula, the water reducing agent is mixed into the concrete and is mutually associated with the concrete particle structure to form a molecular structure with extremely high stability, thereby being beneficial to improving the compressive strength of the concrete;
when sodium tripolyphosphate is used as the dispersant in the formula of example 7, compared with sodium hexametaphosphate used in example 2, the compressive strength of the obtained concrete sample is improved compared with other examples, because sodium tripolyphosphate is used as the dispersant to disperse the water reducing agent among the concrete particle structures, so that the nano silica particles and the concrete particle structures can be effectively combined to form a molecular structure with extremely high stability.
As used in the specification and claims, certain terms are used to refer to particular components or methods. As one skilled in the art will appreciate, different regions may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not in name. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The compound concrete retarding and water reducing agent is characterized by comprising, by mass, 55-65 parts of polycarboxylic acid water reducing mother liquor, 25-35 parts of polycarboxylic acid slump retaining mother liquor, 2-5 parts of chitosan, 2-6 parts of molasses, 0.5-0.8 part of nano silicon dioxide particles, 0.4-0.8 part of a dispersing agent and the balance of water.
2. The compound concrete retarding and water reducing agent of claim 1, wherein the dispersant is sodium hexametaphosphate or sodium tripolyphosphate.
3. The compound concrete retarding and water reducing agent of claim 1, wherein the polycarboxylic acid water reducing mother liquor is prepared from the following raw materials in percentage by weight: 40-45% of unsaturated polyoxyethylene ether, 10-15% of acrylic acid, 0.2-0.6% of sodium methallyl sulfonate, 0.3-0.5% of hydrogen peroxide, 0.7-1.1% of vitamin C and the balance of water.
4. The compound concrete retarding and water reducing agent of claim 1, wherein the polycarboxylic acid slump-retaining mother liquor is prepared from the following raw materials in percentage by weight: 40-45% of unsaturated polyoxyethylene ether, 10-15% of acrylic acid, 0.3-0.6% of maleic anhydride, 0.2-0.6% of thioglycolic acid, 0.3-0.5% of hydrogen peroxide, 0.5-0.8% of vitamin C and the balance of water.
5. The production method of the compound concrete water-reducing retarder according to any one of claims 1 to 4, which is characterized by mainly comprising the following steps:
(1) adding a certain amount of water into a reaction kettle, accurately weighing chitosan and molasses with required dosage according to the component proportion of the water reducing agent, and stirring and dissolving to obtain a solution A;
(2) accurately weighing the polycarboxylic acid water reducing mother liquor and the polycarboxylic acid slump retaining mother liquor with required dosage according to the component proportion of the water reducing agent, and stirring and mixing to obtain a solution B;
(3) controlling the temperature of the reaction kettle at 30 ℃, putting the solution B into the reaction kettle, stirring and mixing the solution B with the solution A, adding the required amount of the dispersant and the nano silicon dioxide particles, stirring and mixing uniformly, and preserving heat for 1-1.5 hours to obtain the compound concrete retarding and water reducing agent.
6. The production method of the compound concrete retarding and water reducing agent of claim 5, wherein in the step (3), the solid content of the compound concrete retarding and water reducing agent is 40%.
7. The use of the compound concrete water-reducing retarder according to any one of claims 1 to 4 in the preparation of ultra-high pumping concrete.
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