CN113135689A - Elasticity-reducing low-sulfur alkali-free liquid accelerator and preparation method thereof - Google Patents
Elasticity-reducing low-sulfur alkali-free liquid accelerator and preparation method thereof Download PDFInfo
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- CN113135689A CN113135689A CN202110595578.6A CN202110595578A CN113135689A CN 113135689 A CN113135689 A CN 113135689A CN 202110595578 A CN202110595578 A CN 202110595578A CN 113135689 A CN113135689 A CN 113135689A
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- 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
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- 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
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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Abstract
An elasticity-reducing low-sulfur alkali-free liquid accelerator and a preparation method thereof, wherein the accelerator is prepared from the following raw materials: 28 to 35 percent of quick-setting component I, 7 to 12 percent of quick-setting component II, 1.5 to 2.5 percent of quick-setting component III, 2 to 4 percent of inorganic stabilizer, 2 to 5 percent of organic reinforcing agent, 0.4 to 0.55 percent of rebound inhibitor and the balance of water. The quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is sulfuric acid, phosphoric acid and nitric acid, the organic reinforcing agent is diethanolamine, N-methyldiethanolamine and diethanol monoisopropanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methylcellulose, polyacrylamide and redispersible emulsion powder. The invention also provides a preparation method of the accelerator. It can reduce the high rebound rate in the wet spraying process, increase the early strength and the later strength of the concrete, and has good stability, low mixing amount, fast setting time of the concrete and good adaptability to different cements.
Description
Technical Field
The invention relates to an accelerator for concrete, in particular to an elasticity-reducing low-sulfur alkali-free liquid accelerator and a preparation method thereof.
Background
The accelerator is an additive which can quickly condense and harden concrete and ensure that the concrete reaches enough strength in a short time so as to ensure special construction requirements, and is widely applied to projects such as tunnel, mining, side slope protection, building structure reinforcement, crack resistance, seepage prevention, leakage stoppage, emergency rescue and the like. The traditional accelerator is mainly powder, has the defects of large resilience, much dust, uneven dispersion of the accelerator in concrete mixture and the like, and compared with the traditional accelerator, the liquid accelerator has the advantages of low production and construction energy consumption, good homogeneity, no dust pollution, friendly working environment and the like, and is widely applied at present. The liquid accelerator is divided into two types of alkaline accelerator and alkali-free accelerator, the alkaline liquid accelerator has strong corrosivity, and the excessive alkali content can cause the alkali aggregate reaction to cause the concrete later strength to reduce, the strength loss can reach 30-50% in 28 days, the hardened concrete has large shrinkage and is easy to crack, and the concrete durability is reduced. And the alkali-free liquid accelerator has no corrosiveness, is environment-friendly in construction, and improves the later strength of concrete compared with an alkali liquid accelerator. In recent years, alkali-free liquid accelerators have been widely researched, popularized and applied.
Aluminum sulfate does not contain alkali metal ions and contains a large amount of aluminum ions which are beneficial to cement quick-setting hydration, and the aluminum sulfate becomes a hot spot in the component research of the quick-setting agent at home and abroad. The main raw material for preparing the alkali-free accelerator at the present stage is aluminum sulfate, and the content of the aluminum sulfate is generally higher, and is mostly more than 40%. Along with the continuous increase of the content of aluminum sulfate, the solubility of the accelerator is reduced, and the accelerator is easy to precipitate and crystallize after being stored for a long time. In addition, excess SO4 in the alkali-free accelerator2-The possibility of secondary ettringite generation of the concrete is greatly increased, the later strength loss is caused, the sulfate erosion of the concrete is caused, and the durability of the concrete is reduced.
The alkali-free accelerator developed at the present stage has certain problems: for example, the product is easy to delaminate, precipitate and crystallize, has poor adaptability to cement, overproof alkali content, excessive loss of later strength of concrete and the like. In the work progress, the accelerating agent is arranged in spraying concrete rebound rate generally on the high side, causes too much concrete to drop, and the concrete reuse rate that drops is low, has caused a large amount of cost extravagant, and high dust concentration when spraying the operation not only influences the security of operation, still can pollute the environment around the construction region, brings adverse effect to workman's healthy.
The related patent documents: CN109896771A discloses an alkali-free liquid accelerator and a preparation method thereof, the alkali-free liquid accelerator is prepared by mixing a solution A and a solution B according to a proportion, and the raw material components for preparing the solution A comprise, by mass, 45-60% of aluminum sulfate octadecahydrate, 0.05-1% of sodium fluoride, 2-5% of an inorganic accelerating component, 2-4% of an organic early strength agent and 35-50% of water; the raw materials for preparing the solution B comprise 45-55% of aluminum sulfate octadecahydrate, 8-15% of sodium metaaluminate, 2-4% of organic early strength agent, 3-6% of tackifier and 25-40% of water. CN111333362A discloses a low-dosage high-early-strength alkali-free liquid accelerator and a preparation method thereof, wherein the alkali-free liquid accelerator is prepared from the following raw materials: 50-60% of modified aluminum sulfate, 2-4% of fluorine aluminum complex solution, 3-6% of organic cosolvent, 1-2% of pH regulator, 0.5-1.5% of inorganic stabilizer, 0.3-0.5% of viscosity regulator, 4-6% of composite early strength agent and the balance of water. CN111960713A discloses a high-performance alkali-free liquid accelerator and a preparation method thereof, and the high-performance alkali-free liquid accelerator comprises the following components: 30-45% of active aluminum hydroxide, 3-15% of fluorine-aluminum complex, 0.5-8% of early strength coagulation accelerating component, 2-8% of alcohol amine substance, 5-15% of nano silica sol, 0.5-2% of dispersing agent and water. CN106316199A discloses a high-quality and high-efficiency alkali-free accelerator, which is characterized by comprising the following components in percentage by mass: 10-70% of water-soluble acidic substance; 1-20% of a fluorine-aluminum complex; 5-20% of an organic early strength agent; 5-20% of a solvent, wherein the solvent is water.
The technologies can reduce the higher rebound rate in the wet spraying process of the elasticity-reducing low-sulfur alkali-free liquid accelerator, so that the early strength, particularly the later strength, of the concrete is increased, the mixing amount is low, the setting time of the concrete is fast, and the elasticity-reducing low-sulfur alkali-free liquid accelerator has good adaptability to different cements, and no specific guidance scheme is given.
Disclosure of Invention
The invention aims to solve the technical problem of providing an elasticity-reducing low-sulfur alkali-free liquid accelerator which can reduce the higher rebound rate in the wet spraying process, so that the early strength and the later strength of concrete are increased, and the elasticity-reducing low-sulfur alkali-free liquid accelerator has good stability, low mixing amount, quick concrete setting time and good adaptability to different cements.
Therefore, another technical problem to be solved by the invention is to provide a preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the technical scheme is that the elasticity-reducing low-sulfur alkali-free liquid accelerator is prepared from the following raw materials in percentage by mass: 28 to 35 percent of quick-setting component I, 7 to 12 percent of quick-setting component II, 1.5 to 2.5 percent of quick-setting component III, 2 to 4 percent of inorganic stabilizer, 2 to 5 percent of organic reinforcing agent, 0.4 to 0.55 percent of rebound inhibitor and the balance of water, wherein the sum of the mass percentages of the components is 100 percent. The quick-setting component I is aluminum sulfate octadecahydrate, industrial grade, powdery, with the maximum grain diameter less than or equal to 1.5mm and Al2O3The content is 15-17%. The quick-setting component II is aluminum dihydrogen phosphate, industrial grade, solid, the content is more than or equal to 99 percent. The quick-setting component III is sodium metaaluminate, industrial grade, solid, NaAlO2The content is greater than or equal to 85%. The inorganic stabilizer is one or a combination of more raw materials (the proportion is arbitrary) of sulfuric acid, phosphoric acid and nitric acid, preferably phosphoric acid, industrial grade, and the content is more than or equal to 85%. Inorganic acid is adjustableAcidity of the solution, inhibition of Al3+Hydrolyzing to keep the solution stable. The organic reinforcing agent is one or a combination of more raw materials of diethanolamine, N-methyldiethanolamine and diethanolisopropanolamine (the proportion is arbitrary when the organic reinforcing agent is combined), and preferably diethanolamine, industrial grade, with the content of more than or equal to 98 percent. The alcohol amine has the main function of promoting the development of the early strength of concrete, and a nitrogen atom on a molecular structure of the alcohol amine has a pair of isolated electrons, can be complexed with aluminum ions to form water-soluble complex ions, promotes the dissolution of aluminum sulfate, and has a certain effect on keeping the stability of a product. The rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to the optimal weight ratio of 1:4:0.2, wherein the molecular weight of the hydroxypropyl methyl cellulose is 10 ten thousand, the molecular weight of the polyacrylamide is 800 ten thousand, and the redispersible latex powder is a German Wake 5044N type commercial product. The rebound inhibitor is prepared by introducing a high molecular organic substance into an inorganic accelerator, and can play a role in thickening and preventing sedimentation and keep the stability of a product. On the other hand, the early-stage high strength of concrete can be realized by improving a concrete structure, the cohesiveness of the sprayed concrete mixture can be obviously improved, the thickness of a sprayed layer of the sprayed concrete is improved, and dust and resilience rate generated during spraying are reduced.
The preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder into a container filled with water according to the weight ratio of 1: 4-5: 0.2-0.3 under the high-speed stirring state at the rotating speed of 500-600 r/min, and continuously stirring for 30-60 min at the rotating speed until all the components are completely dissolved to obtain a solution A, wherein the water is 25% -35% of the total water amount;
s2, adding the quick-setting component I and the quick-setting component II into a vessel containing residual water, stirring for 30-40 min, slowly and uniformly adding the quick-setting component III into the vessel within 10-15 min, continuously stirring for 60-70 min until all the components are completely dissolved, adding the inorganic stabilizer and the organic reinforcing agent into the vessel, and continuously stirring for 30-40 min to obtain a uniform and stable solution B;
and S3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 30-40 min to finally obtain a product (finished product) which is the elasticity-reducing low-sulfur alkali-free liquid accelerator.
In the above technical solution, a preferable technical solution may be: the inorganic stabilizer is preferably phosphoric acid. The organic enhancer is preferably diethanolamine. In step S1, the weight ratio of hydroxypropyl methylcellulose, polyacrylamide and redispersible latex powder is preferably 1:4: 0.2.
In the above technical solution, a preferable technical solution may be that: the elasticity-reducing low-sulfur alkali-free liquid accelerator is prepared from the following components in percentage by mass: 30% of a quick-setting component I, 10% of a quick-setting component II, 2% of a quick-setting component III, 2.4% of an inorganic stabilizer, 4% of an organic reinforcing agent, 0.52% of a rebound inhibitor and 51.08% of water; the quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is phosphoric acid, the organic reinforcing agent is diethanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to a certain proportion. S1, adding 0.1 part of hydroxypropyl methyl cellulose, 0.4 part of polyacrylamide and 0.02 part of redispersible latex powder into a container containing 16.08 parts of water according to the weight ratio of 1:4:0.2 under the high-speed stirring state at the rotating speed of 500r/min, and continuously stirring for 30min at the rotating speed until all the components are completely dissolved to prepare a solution A; s2, adding 30 parts of the first quick-setting component and 10 parts of the second quick-setting component into a vessel containing 35 parts of water, stirring for 30min, slowly and uniformly adding the third quick-setting component into the vessel within 10min, continuously stirring for 60min until all the components are completely dissolved, adding 2.4 parts of inorganic stabilizer and 4 parts of organic reinforcing agent into the vessel, and continuously stirring for 30min to obtain a uniform stable solution B; s3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 35min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
Among the above-described technical solutions, preferred technical solutions may also be the following embodiments 2 and 3.
The elasticity-reducing low-sulfur alkali-free liquid accelerator can be directly wet-sprayed on a construction site.
Referring to the performance test tables 1 and 2 in the specification, the alkali-free liquid accelerator prepared by the invention can ensure that the initial setting time of the Emei cement is less than 2min and the final setting time is less than 4min under the doping amount of 6%, the standard requirements of GB/T35159 and 2017 accelerator for sprayed concrete are met, the 1-day strength of mortar is more than 10MPa, and the 28-day compressive strength ratio is more than 100%. The alkali-free accelerator prepared by the invention can enable different brands and different types of cement to meet the standard requirements of GB/T35159 and 2017 accelerator for sprayed concrete at the mixing amount of 5%, has faster setting time at the mixing amount of 6%, and simultaneously has higher early and later strength retention and good cement adaptability. The alkali-free accelerator prepared by the invention is stable in state, can be stored for a long time at 0-40 ℃, and still has no demixing deposition after being placed for 6 months. The rebound rate of the sprayed concrete is low and within 10 percent when the concrete is used for a field spraying test, and the application effect is good.
The invention has the following advantages:
1. the product is a low-sulfur alkali-free and chlorine-free liquid accelerator, is prepared at normal temperature, is environment-friendly and safe, has no pungent smell, does not corrode a human body, does not contain fluorine elements, has no adverse effect on the strength of concrete, greatly reduces the damage effect on the concrete caused by the introduction of alkaline substances, does not rust reinforcing steel bars, reduces the generation of secondary ettringite, and has higher early and later strength.
2. The three quick-setting components have synergistic effect, the product mixing amount is low, the setting time is short, and the cement mortar has good adaptability to different cements.
3. The addition of the rebound inhibitor in the product can obviously improve the cohesiveness of the sprayed concrete mixture, increase the cohesiveness of wet sprayed concrete, reduce dust and rebound rate generated during spraying, save engineering cost, obviously improve the stability of the liquid alkali-free accelerator, prolong the stabilization period by more than 6 months, and can be stored for a long time at 0-40 ℃ without layering and precipitation phenomena. Compared with the prior art, the storage time of the accelerator is prolonged by more than one time, and the engineering cost is reduced by more than 10%.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: the elasticity-reducing low-sulfur alkali-free liquid accelerator is prepared from the following raw materials in percentage by mass: 30% of a quick-setting component I, 10% of a quick-setting component II, 2% of a quick-setting component III, 2.4% of an inorganic stabilizer, 4% of an organic reinforcing agent, 0.52% of a rebound inhibitor and 51.08% of water. The quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is phosphoric acid, the organic reinforcing agent is diethanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to a certain proportion. The preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding 0.1 part of hydroxypropyl methyl cellulose, 0.4 part of polyacrylamide and 0.02 part of redispersible latex powder into a container filled with 16.08 parts of water according to the weight ratio of 1:4:0.2 under the high-speed stirring state at the rotating speed of 500r/min, and continuing stirring for 30min at the rotating speed until all the components are completely dissolved, thereby preparing a solution A;
s2, adding 30 parts of the first quick-setting component and 10 parts of the second quick-setting component into a vessel containing 35 parts of water, stirring for 30min, slowly and uniformly adding the third quick-setting component into the vessel within 10min, continuously stirring for 60min until all the components are completely dissolved, adding 2.4 parts of inorganic stabilizer and 4 parts of organic reinforcing agent into the vessel, and continuously stirring for 30min to obtain a uniform stable solution B;
s3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 35min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
Example 2: the elasticity-reducing low-sulfur alkali-free liquid accelerator is prepared from the following raw materials in percentage by mass: 35% of a quick-setting component I, 7% of a quick-setting component II, 2.5% of a quick-setting component III, 4% of an inorganic stabilizer, 4% of an organic reinforcing agent, 0.416% of a rebound inhibitor and 47.084% of water. The quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is sulfuric acid, the organic reinforcing agent is N-methyldiethanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methylcellulose, polyacrylamide and redispersible latex powder according to a certain proportion. The preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding 0.08 part of hydroxypropyl methyl cellulose, 0.32 part of polyacrylamide and 0.016 part of redispersible latex powder into a container containing 12.084 parts of water in a high-speed stirring state at the rotating speed of 500r/min according to the weight ratio of 1:4:0.2, and continuously stirring for 40min at the rotating speed until all the components are completely dissolved to prepare a solution A;
s2, adding 35 parts of the first quick-setting component and 7 parts of the second quick-setting component into a vessel containing 35 parts of water, stirring for 30min, slowly and uniformly adding 2.5 parts of the third quick-setting component into the vessel within 15min, continuously stirring for 60min, adding 4 parts of inorganic stabilizer and 4 parts of organic reinforcing agent into the vessel after all the components are completely dissolved, and continuously stirring for 30min to obtain a uniform and stable solution B;
s3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 40min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
Example 3: the elasticity-reducing low-sulfur alkali-free liquid accelerator is prepared from the following raw materials in percentage by mass: 28% of a quick-setting component I, 12% of a quick-setting component II, 1.5% of a quick-setting component III, 2.5% of an inorganic stabilizer, 3% of an organic reinforcing agent, 0.52% of a rebound inhibitor and 52.48% of water. The quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is a combination of phosphoric acid and nitric acid, the mass ratio of the phosphoric acid to the nitric acid is 1:2.5, the organic reinforcing agent is a combination of N-methyldiethanolamine and diethanol monoisopropanolamine, the mass ratio of the N-methyldiethanolamine to the diethanol monoisopropanolamine is 1:0.5, and the rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to a certain proportion. The preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding 0.1 part of hydroxypropyl methyl cellulose, 0.4 part of polyacrylamide and 0.02 part of redispersible latex powder into a container filled with 17.48 water according to the weight ratio of 1:4:0.2 under the high-speed stirring state at the rotating speed of 500r/min, and continuously stirring for 30min at the rotating speed until all the components are completely dissolved to prepare a solution A;
s2, adding 28 parts of the first quick-setting component and 12 parts of the second quick-setting component into a vessel containing 35 parts of water, stirring for 30min, slowly and uniformly adding 1.5 parts of the third quick-setting component into the vessel within 10min, continuously stirring for 60min, adding 2.5 parts of an inorganic stabilizer and 3 parts of an organic reinforcing agent into the vessel after all the components are completely dissolved, and continuously stirring for 30min to obtain a uniform and stable solution B;
s3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 40min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
In the above examples 1 to 3, the first quick-setting component is aluminum sulfate octadecahydrate, technical grade, powdery, with a maximum particle size of 1.5mm or less, Al2O3The content is 15 to 17 percent. The quick-setting component II is aluminum dihydrogen phosphate, industrial grade, solid, the content is more than or equal to 99 percent. The quick-setting component III is sodium metaaluminate, industrial grade, solid, NaAlO2The content is greater than or equal to 85%. The inorganic stabilizer is preferably phosphoric acid, technical grade, with a content greater than or equal to 85%. The organic intensifier is preferably diethanolamine, technical grade, with a content greater than or equal to 98%. The rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to the optimal weight ratio of 1:4:0.2, wherein the molecular weight of the hydroxypropyl methyl cellulose is 10 ten thousand, the molecular weight of the polyacrylamide is 800 ten thousand, and the redispersible latex powder is a German Wake 5044N type commercial product.
The performance test of the invention:
the cement paste setting time test is carried out according to GB/T35159 and 2017 accelerator for sprayed concrete: e, Nyung P.O42.5 cement: 400g, water: 140g of the total weight of the mixture,
testing the strength of the mortar: e, Nyung P.O42.5 cement: 900g, standard sand: 1350g, water: 450 g.
The accelerator is added according to 6 percent of the weight of cement, and the water in the liquid accelerator is deducted from the water consumption. A set of blanks was added to the strength test to test the 28-day compressive strength ratio of the cement mortars incorporating the accelerator samples, and the results are shown in Table 1.
TABLE 1
The alkali-free liquid accelerator prepared by the invention can ensure that the initial setting time of the Emei cement is less than 2min and the final setting time is less than 4min under the doping amount of 6 percent, meets the standard requirements of GB/T35159-.
The elasticity-reducing low-sulfur alkali-free accelerator prepared in example 2 was subjected to setting time and mortar strength tests according to GB/T35159-2017 accelerator for sprayed concrete to investigate the adaptability of the product to different types and brands of cement, and the test results are shown in Table 2.
TABLE 2
The alkali-free accelerator prepared by the invention can enable different brands and different types of cement to meet the standard requirements of GB/T35159 and 2017 accelerator for sprayed concrete at the mixing amount of 5%, has faster setting time at the mixing amount of 6%, and simultaneously has higher early and later strength retention and good cement adaptability. The alkali-free accelerator prepared by the invention is stable in state, can be stored for a long time at 0-40 ℃, and still has no demixing deposition after being placed for 6 months. The rebound rate of the sprayed concrete is low and within 10 percent when the concrete is used for a field spraying test, and the application effect is good.
Compared with the technical scheme of the alkali-free liquid accelerator and the preparation method thereof disclosed by CN109896771A, the invention has the following advantages: the alkali-free setting accelerator (product) has higher content of active aluminum ions and quick setting time, and can reduce the doping amount of the setting accelerator from 7 percent to 5 to 6 percent aiming at the standard cement. The alkali-free accelerator (product) disclosed by the invention is a low-sulfur alkali-free accelerator, the content of sulfate radicals in the alkali-free liquid accelerator disclosed by CN109896771A is high, and excessive sulfate radicals are introduced into concrete, so that the possibility of generating secondary ettringite is increased, and the durability of the concrete is reduced. The sulfate ions can also prolong the crystallization process of the ettringite, and the 28-day strength of the concrete is reduced by 10 to 20 percent. The rebound inhibitor added in the invention can improve the stability of the accelerator, increase the cohesiveness of the sprayed concrete and obviously reduce the rebound rate of the sprayed concrete. According to the technical scheme disclosed by CN109896771A, the coagulant needs to be synthesized at high temperature, and A, B two solutions are prepared and used in a compounding manner on site, so that the actual application process is complex. The invention is produced at normal temperature, is green and environment-friendly, and has good economic benefit and social benefit.
In conclusion, the invention provides the elasticity-reducing low-sulfur alkali-free liquid accelerator and the preparation method thereof, the accelerator reduces the higher rebound rate in the wet spraying process, so that the early strength, particularly the later strength of concrete is increased, the stability of the accelerator is good, the mixing amount is low, the setting time of the concrete is fast, and the accelerator has good adaptability to different cements. The storage time of the accelerator is prolonged by more than one time, and the engineering cost is reduced by more than 10%.
Claims (10)
1. The elasticity-reducing low-sulfur alkali-free liquid accelerator is characterized by being prepared from the following raw materials in percentage by mass: 28 to 35 percent of quick-setting component I, 7 to 12 percent of quick-setting component II, 1.5 to 2.5 percent of quick-setting component III, 2 to 4 percent of inorganic stabilizer, 2 to 5 percent of organic reinforcing agent, 0.4 to 0.55 percent of rebound inhibitor and the balance of water, wherein the sum of the mass percentages of the components is 100 percent; the quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is one or a combination of more of sulfuric acid, phosphoric acid and nitric acid, the organic reinforcing agent is one or a combination of more of diethanolamine, N-methyldiethanolamine and diethanol monoisopropanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methylcellulose, polyacrylamide and redispersible latex powder according to a certain proportion;
the preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder into a container filled with water according to the weight ratio of 1: 4-5: 0.2-0.3 under the high-speed stirring state at the rotating speed of 500-600 r/min, and continuously stirring for 30-60 min at the rotating speed until all the components are completely dissolved to obtain a solution A, wherein the water is 25% -35% of the total water amount;
s2, adding the quick-setting component I and the quick-setting component II into a vessel containing residual water, stirring for 30-40 min, slowly and uniformly adding the quick-setting component III into the vessel within 10-15 min, continuously stirring for 60-70 min until all the components are completely dissolved, adding the inorganic stabilizer and the organic reinforcing agent into the vessel, and continuously stirring for 30-40 min to obtain a uniform and stable solution B;
and S3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 30-40 min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
2. The elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 1, wherein the inorganic stabilizer is phosphoric acid.
3. The elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 1, wherein the organic enhancer is diethanolamine.
4. The elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 1, wherein in step S1, the weight ratio of hydroxypropyl methylcellulose, polyacrylamide and redispersible latex powder is 1:4: 0.2.
5. The elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 1, which is prepared from the following raw materials in percentage by mass: 30% of a quick-setting component I, 10% of a quick-setting component II, 2% of a quick-setting component III, 2.4% of an inorganic stabilizer, 4% of an organic reinforcing agent, 0.52% of a rebound inhibitor and 51.08% of water; the quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is phosphoric acid, the organic reinforcing agent is diethanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to a certain proportion;
the preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding 0.1 part of hydroxypropyl methyl cellulose, 0.4 part of polyacrylamide and 0.02 part of redispersible latex powder into a container filled with 16.08 parts of water according to the weight ratio of 1:4:0.2 under the high-speed stirring state at the rotating speed of 500r/min, and continuing stirring for 30min at the rotating speed until all the components are completely dissolved, thereby preparing a solution A;
s2, adding 30 parts of the first quick-setting component and 10 parts of the second quick-setting component into a vessel containing 35 parts of water, stirring for 30min, slowly and uniformly adding the third quick-setting component into the vessel within 10min, continuously stirring for 60min until all the components are completely dissolved, adding 2.4 parts of inorganic stabilizer and 4 parts of organic reinforcing agent into the vessel, and continuously stirring for 30min to obtain a uniform stable solution B;
s3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 35min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
6. The elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 1, which is prepared from the following raw materials in percentage by mass: 35% of a first quick-setting component, 7% of a second quick-setting component, 2.5% of a third quick-setting component, 4% of an inorganic stabilizer, 4% of an organic reinforcing agent, 0.416% of a rebound inhibitor and 47.084% of water; the quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is sulfuric acid, the organic reinforcing agent is N-methyldiethanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to a certain proportion;
the preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding 0.08 part of hydroxypropyl methyl cellulose, 0.32 part of polyacrylamide and 0.016 part of redispersible latex powder into a container containing 12.084 parts of water in a high-speed stirring state at the rotating speed of 500r/min according to the weight ratio of 1:4:0.2, and continuously stirring for 40min at the rotating speed until all the components are completely dissolved to prepare a solution A;
s2, adding 35 parts of the first quick-setting component and 7 parts of the second quick-setting component into a vessel containing 35 parts of water, stirring for 30min, slowly and uniformly adding 2.5 parts of the third quick-setting component into the vessel within 15min, continuously stirring for 60min, adding 4 parts of inorganic stabilizer and 4 parts of organic reinforcing agent into the vessel after all the components are completely dissolved, and continuously stirring for 30min to obtain a uniform and stable solution B;
s3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 40min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
7. The elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 1, which is prepared from the following raw materials in percentage by mass: 28% of a quick-setting component I, 12% of a quick-setting component II, 1.5% of a quick-setting component III, 2.5% of an inorganic stabilizer, 3% of an organic reinforcing agent, 0.52% of a rebound inhibitor and 52.48% of water; the quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is a combination of two raw materials of phosphoric acid and nitric acid, the mass ratio of the phosphoric acid to the nitric acid is 1:2.5, the organic reinforcing agent is a combination of two raw materials of N-methyldiethanolamine and diethanol monoisopropanolamine, the mass ratio of the N-methyldiethanolamine to the diethanol monoisopropanolamine is 1:0.5, and the rebound inhibitor is prepared by mixing hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder according to a certain proportion;
the preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding 0.1 part of hydroxypropyl methyl cellulose, 0.4 part of polyacrylamide and 0.02 part of redispersible latex powder into a container filled with 17.48 water according to the weight ratio of 1:4:0.2 under the high-speed stirring state at the rotating speed of 500r/min, and continuously stirring for 30min at the rotating speed until all the components are completely dissolved to prepare a solution A;
s2, adding 28 parts of the first quick-setting component and 12 parts of the second quick-setting component into a vessel containing 35 parts of water, stirring for 30min, slowly and uniformly adding 1.5 parts of the third quick-setting component into the vessel within 10min, continuously stirring for 60min, adding 2.5 parts of an inorganic stabilizer and 3 parts of an organic reinforcing agent into the vessel after all the components are completely dissolved, and continuously stirring for 30min to obtain a uniform and stable solution B;
s3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 40min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
8. The preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator is characterized in that the elasticity-reducing low-sulfur alkali-free liquid accelerator is prepared from the following components in percentage by mass: 28 to 35 percent of quick-setting component I, 7 to 12 percent of quick-setting component II, 1.5 to 2.5 percent of quick-setting component III, 2 to 4 percent of inorganic stabilizer, 2 to 5 percent of organic reinforcing agent, 0.4 to 0.55 percent of rebound inhibitor and the balance of water, wherein the sum of the mass percentages of the components is 100 percent; the quick-setting component I is aluminum sulfate octadecahydrate, the quick-setting component II is aluminum dihydrogen phosphate, the quick-setting component III is sodium metaaluminate, the inorganic stabilizer is one or a combination of more of sulfuric acid, phosphoric acid and nitric acid, the organic reinforcing agent is one or a combination of more of diethanolamine, N-methyldiethanolamine and diethanol monoisopropanolamine, and the rebound inhibitor is prepared by mixing hydroxypropyl methylcellulose, polyacrylamide and redispersible latex powder according to a certain proportion;
the preparation method of the elasticity-reducing low-sulfur alkali-free liquid accelerator comprises the following process steps:
s1, adding hydroxypropyl methyl cellulose, polyacrylamide and redispersible latex powder into a container filled with water according to the weight ratio of 1: 4-5: 0.2-0.3 under the high-speed stirring state at the rotating speed of 500-600 r/min, and continuously stirring for 30-60 min at the rotating speed until all the components are completely dissolved to obtain a solution A, wherein the water is 25% -35% of the total water amount;
s2, adding the quick-setting component I and the quick-setting component II into a vessel containing residual water, stirring for 30-40 min, slowly and uniformly adding the quick-setting component III into the vessel within 10-15 min, continuously stirring for 60-70 min until all the components are completely dissolved, adding the inorganic stabilizer and the organic reinforcing agent into the vessel, and continuously stirring for 30-40 min to obtain a uniform and stable solution B;
and S3, adding the solution A prepared in the step S1 into the vessel containing the solution B under the stirring state, and stirring for 30-40 min to finally obtain the product, namely the elasticity-reducing low-sulfur alkali-free liquid accelerator.
9. The method for preparing a elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 8, wherein the inorganic stabilizer is phosphoric acid.
10. The method for preparing the elasticity-reducing low-sulfur alkali-free liquid accelerator as claimed in claim 8, wherein the organic reinforcing agent is diethanolamine.
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| CN114477831A (en) * | 2022-01-24 | 2022-05-13 | 山西佳维新材料股份有限公司 | Composition for preparing low-alkali accelerator and preparation method of low-alkali accelerator |
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| CN114573267A (en) * | 2022-04-14 | 2022-06-03 | 中铁八局集团有限公司 | Alkali-free, chlorine-free and fluorine-free environment-friendly liquid accelerator, preparation method and application thereof |
| CN115872662A (en) * | 2022-06-16 | 2023-03-31 | 桂林理工大学 | Liquid alkali-free accelerator for sprayed concrete and preparation method thereof |
| CN115872662B (en) * | 2022-06-16 | 2024-04-26 | 桂林理工大学 | Liquid alkali-free accelerator for sprayed concrete and preparation method thereof |
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| CN116730376B (en) * | 2023-06-20 | 2024-01-26 | 济南大学 | Monosulfur hydrated calcium sulfoaluminate and chlorine erosion resistant additive thereof, preparation method and application |
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