CN112028534B - Early-strength water reducing agent, production process and application thereof - Google Patents
Early-strength water reducing agent, production process and application thereof Download PDFInfo
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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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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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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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- 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
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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
- C04B2103/60—Agents for protection against chemical, physical or biological attack
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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
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/603—Agents for controlling alkali-aggregate reactions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention relates to an early strength type water reducing agent, a production process and application thereof, belonging to the technical field of concrete admixture, and comprising the following components, by weight, 80-100 parts of a polycarboxylic acid water reducing agent, 30-50 parts of calcium chloride, 10-25 parts of corn straw powder, 5-8 parts of silica fume, 12-18 parts of fly ash, 5-8 parts of nano silicon dioxide, 15-25 parts of diatomite, 10-15 parts of paraffin particles and 40-60 parts of water; the preparation method comprises the following steps of uniformly mixing the raw materials to obtain the water reducer. The invention has the effects of reducing alkali aggregate reaction and improving the sulfate corrosion resistance of concrete.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to an early strength type water reducing agent, a production process and application thereof.
Background
The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump constant of concrete. Most of the anionic surfactants comprise lignosulfonate, naphthalene sulfonate formaldehyde polymer, polycarboxylic acid series and the like, and the water reducing agent is added to disperse cement particles, so that the workability of the cement particles can be improved, the unit water consumption can be reduced, the fluidity of concrete mixtures can be improved, the unit cement consumption can be reduced, and the cement can be saved.
In recent years, along with the rapid development of economy in China, in many projects, in order to accelerate the progress of the project and shorten the construction period, an early strength water reducing agent is required to accelerate the hydration speed of cement, the early strength of concrete and ensure the smooth completion of the project.
The prior Chinese patent with the reference publication number of CN103304181A discloses an early-strength polycarboxylic acid high-performance water reducing agent, which comprises the following components in percentage by weight: 10-20% of polycarboxylic acid water reducing agent, 10-17% of calcium chloride, 10-20% of sodium nitrite, 1-3% of triethanolamine and the balance of water.
The above prior art solutions have the following drawbacks: in addition, the calcium chloride is added to increase calcium ions in the concrete, so that the probability of producing calcium sulfate by the reaction of the calcium ions and sulfate is increased, the concrete is cracked, and the performance of the concrete for resisting sulfate corrosion is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an early strength water reducing agent which has the effects of reducing alkali-aggregate reaction and improving the sulfate corrosion resistance of concrete.
The invention also aims to provide a production process of the early strength water reducing agent, which has the effects of simple preparation method and convenient operation.
The invention aims to provide an application of an early strength water reducing agent in building materials.
The purpose of the invention is realized by the following technical scheme:
the early strength type water reducing agent comprises, by weight, 80-100 parts of a polycarboxylic acid water reducing agent, 30-50 parts of calcium chloride, 10-25 parts of corn straw powder, 5-8 parts of silica fume, 12-18 parts of fly ash, 5-8 parts of nano silicon dioxide, 15-25 parts of diatomite, 10-15 parts of paraffin particles and 40-60 parts of water.
Through adopting above-mentioned technical scheme, contain a large amount of protein in the maize straw powder, the adding of maize straw powder can be with the calcium ion complex in the concrete, reduces the concentration of calcium ion to reduce the condition that sulphate and calcium ion reaction generated calcium sulfate, reduce the fracture of concrete, thereby improve the ability that the anti sulphate of concrete corrodes. In addition, the corn straw powder contains plant cellulose, the plant cellulose has excellent bond strength, huge fiber specific surface area, higher toughness and strength and the like, and after the plant cellulose is added into concrete, the plastic shrinkage of the concrete can be effectively prevented, the stress concentration at the tip of a microcrack is reduced, the tensile stress caused by the concrete shrinkage is weakened or eliminated, and the microcrack is prevented from generating and expanding, so that the generation of cracks is greatly reduced, the permeation of corrosive substances such as sulfate radicals in the external environment is slowed down, the impermeability of the concrete is improved, and meanwhile, the corrosion channel to reinforcing steel bars is reduced due to the great reduction of the cracks, so that the durability of the concrete is greatly improved.
The nano silicon dioxide particles have small size and high reactivity, and after being added into concrete, the high reactivity of the nano silicon dioxide particles can be hydrated with cement minerals or hydration products to accelerate the hydration process and generate a large amount of calcium hydroxide, so that the hydration speed of the fly ash is increased, and the reaction of the fly ash needs to consume alkali ions, so that the content of the alkali ions in the alkali concrete has an inhibiting effect on the alkali aggregate reaction. Meanwhile, the nano silicon dioxide can react with alkali ions in the concrete, so that the top content of the alkali ions in the concrete is further reduced. The nano silicon dioxide and the fly ash are cooperatively matched to improve the hydration speed of the cement, so that the early strength of the concrete is improved, and meanwhile, the nano silicon dioxide and the fly ash digest alkali ions in the concrete, so that the alkali aggregate reaction is reduced, and the corrosion to the concrete is reduced.
The diatomite is of a porous structure and can adsorb alkali ions in the concrete, so that the concentration of the alkali ions in the concrete is reduced, the alkali reaction of the aggregate is reduced, and the corrosion resistance of the concrete is improved. In addition, the diatomite with the porous structure can adsorb chloride ions in calcium chloride, reduce the migration speed of the chloride ions and further reduce the corrosion of the chloride ions to concrete.
During the rapid hydration process of cement, a large amount of hydration heat is generated, and the large amount of hydration heat is accumulated in concrete and cannot be released in time, so that the concrete is expanded and cracked, and the concrete is damaged. Due to the addition of the paraffin particles, when the heat in the concrete is high, the paraffin particles melt and absorb the heat, so that the damage of hydration heat to the concrete is reduced. When the temperature of the concrete is reduced, the paraffin liquid is solidified and releases heat, and the solidified paraffin film can block cracks in the concrete and reduce the migration of chloride ions and sulfate ions, so that the impermeability of the concrete is improved.
The polycarboxylate water reducing agent can reduce the mixing water consumption under the condition of keeping the fluidity and the consumption of cement unchanged, thereby reducing the water cement ratio, reducing the communicated pores formed by excessive hydration water of cement in the solidification process of concrete, increasing the compactness of the concrete, improving the compressive strength of the concrete and further improving the durability of the concrete.
In conclusion, the formula of the invention selects specific raw materials, and limits the proportion of the raw materials, so that the raw materials are mutually matched and act synergistically, the early strength of the concrete is improved, the alkali aggregate reaction and the corrosion of sulfate ions can be reduced, the sulfate ion corrosion resistance of the concrete is improved, and the durability of the concrete is further improved.
In a preferred example, the invention can be further configured to comprise, by weight, 85-95 parts of a graphene oxide modified polycarboxylic acid water reducing agent, 35-45 parts of calcium chloride, 15-20 parts of corn straw powder, 6-7 parts of silica fume, 15-17 parts of fly ash, 5.5-7 parts of nano silica, 18-22 parts of diatomite, 12-14 parts of paraffin particles and 45-55 parts of water.
By adopting the technical scheme, experiments show that the proportion of the raw materials is reduced, and the obtained concrete has better early strength and sulfate corrosion resistance. The reason for this analysis may be that the synergy between the raw materials is stronger in this range, resulting in better compressive strength and resistance to sulfate attack of the concrete.
The invention in a preferred example can be further configured that the weight ratio of the fly ash to the nano-silica is 2-3.
By adopting the technical scheme, tests show that when the weight ratio of the fly ash to the nano silicon dioxide is 2-3, the concrete has better compressive strength and sulfate erosion resistance. The reason is analyzed, in the proportion range, the synergistic effect of the nano silicon dioxide and the fly ash is good, the nano silicon dioxide induces the hydration reaction of the fly ash, so that the hydration reaction speed of the fly ash is high, the early strength of concrete is improved, a large amount of alkali ions are digested by the hydration of the fly ash, and the alkali reaction of aggregate is reduced.
The invention in a preferred example can be further configured that the diatomite is modified diatomite, and the modification method comprises the following steps:
s1: calcining the diatomite at 850-950 ℃ for 10-15 h;
s2: soaking the calcined diatomite in the step S1 in alkali liquor for 5-8 h;
s3: and (5) soaking the diatomite soaked in the alkali liquor in the step S2 in an acid liquor for 1-3h, and then cleaning until the cleaning liquor is neutral.
Through adopting above-mentioned technical scheme, calcine the back to the diatomaceous earth, can effectively get rid of the impurity in the diatomaceous earth to the jam clay mineral in the diatomaceous earth micropore that makes plays the effect of dredging the hole structure, improves the adsorption performance of diatomaceous earth to alkali ion in the concrete. In addition, the calcination can activate the silicon hydroxyl on the surface of the diatomite and improve the reaction activity of the diatomite, thereby further improving the hydration reaction of the cement and further improving the early strength of the concrete. After the diatomite is soaked in the alkali liquor and the acid liquor, acidic impurities, alkali metals and alkali metal oxide impurities of the diatomite can be removed, the purification effect is achieved, the pore structure of the diatomite is further dredged, the specific surface area of the diatomite is improved, the surface property of the diatomite can be changed, and the adsorption capacity to different substances is improved.
In a preferred example of the present invention, the method may further include that the alkali solution in step S2 is a sodium hydroxide solution with a mass concentration of 3-4%; the acid solution in the step S3 is hydrochloric acid solution with the molar concentration of 1-3 mol/L.
The present invention may be further configured in a preferred embodiment such that the nano-silica has a particle size in the range of 25-35 nm.
By adopting the technical scheme, experiments show that when the particle size of the nano silicon dioxide is 25-35nm, the concrete has better compression resistance and sulfate erosion resistance. The reason is analyzed, the smaller the particle size of the nano silicon dioxide is, the higher the activity of the nano silicon dioxide is, the faster the nano silicon dioxide is hydrated with cement minerals to generate calcium hydroxide, the larger the reaction degree is, C-S-H gel formed in the reaction process can fill the pores in the concrete in time, the compactness of the concrete is improved, and therefore the compression resistance and the sulfate corrosion resistance are improved. However, when the particle size of the nano silica is small, the fluidity is poor, and the dispersibility is likely to be poor.
In a preferred example, the invention can be further configured that the polycarboxylic acid water reducing agent is an acrylic acid polycarboxylic acid water reducing agent, wherein the solid content of the water reducing agent is 35-40%.
The invention also aims to provide a preparation method of the early strength water reducing agent, which comprises the following steps: and uniformly mixing the raw materials to obtain the water reducer.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the early strong alkali water aqua provided by the invention can reduce alkali aggregate reaction, improve the erosion resistance of concrete and increase the compression resistance and the erosion resistance of concrete while improving the early strength of concrete.
2. In the formula, the calcium chloride and the corn straw powder have a synergistic effect, the plasticizing effect is good, the early strength of the concrete can be increased, the alkali aggregate reaction and the concrete cracking caused by the existence of the calcium chloride can be reduced, and in addition, the breaking strength of the concrete can be improved by adding the corn straw powder.
3. In the formula of the invention, the nano silicon dioxide induces the hydration reaction of the fly ash, so that the hydration speed of the fly ash is improved, on one hand, alkali ions in concrete are consumed, and the alkali aggregate reaction is reduced; on the other hand, the hydration of the cement can be accelerated, the hydration process of the cement is improved, and the early strength of the concrete is increased.
4. The paraffin particles are added, so that cracks caused by the fact that a large amount of hydration heat cannot be released can be relieved, the generation of concrete cracks is reduced, meanwhile, after the melted paraffin particles are solidified, cracks or pore channels of concrete can be blocked, the migration of sulfate ions and chloride ions in the concrete is reduced, and the impermeability and the durability of the concrete are improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples and comparative examples:
the corn straw powder is purchased from Shaanxi Jinhe agricultural science and technology Limited company;
the nano silicon dioxide is purchased from Jiangsu Tianxing New Material Co., Ltd, and has the model number of TSP-H10;
paraffin wax pellets were purchased from cangzhou ten thousand source beeswax limited;
diatomaceous earth was purchased from spring diatomaceous earth products, ltd, Shengzhou city;
calcium chloride was purchased from Weichai Ministry of Industrial science, Inc.
Example 1
An early strength type water reducing agent prepared by the following method is prepared by adding 100g of polycarboxylic acid water reducing agent, 30g of calcium chloride, 25g of corn straw powder, 5g of silica fume, 18g of fly ash, 5g of nano-silica, 25g of diatomite, 10g of paraffin particles and 60g of water into a stirrer to be uniformly stirred to obtain the early strength type water reducing agent;
wherein the polycarboxylic acid water reducing agent is an acrylic acid polycarboxylic acid water reducing agent, and the solid content is 35%;
the particle size range of the nano silicon dioxide is 25-35 nm;
the fineness of the diatomite is 300-500 meshes.
Example 2
An early strength type water reducing agent prepared by the following method is prepared by adding 85g of polycarboxylic acid water reducing agent, 45g of calcium chloride, 15g of corn straw powder, 7g of silica fume, 15g of fly ash, 7g of nano-silica, 18g of diatomite, 14g of paraffin particles and 45g of water into a stirrer to be uniformly stirred to obtain the early strength type water reducing agent;
wherein the polycarboxylic acid water reducing agent is an acrylic acid polycarboxylic acid water reducing agent, and the solid content is 38%;
the particle size range of the nano silicon dioxide is 25-35 nm;
the fineness of the diatomite is 300-500 meshes.
Example 3
An early strength type water reducing agent prepared by the following method is prepared by adding 90g of polycarboxylic acid water reducing agent, 40g of calcium chloride, 17.5g of corn straw powder, 6.5g of silica fume, 16g of fly ash, 6g of nano-silica, 20g of diatomite, 13g of paraffin particles and 50g of water into a stirrer to be uniformly stirred, and obtaining the early strength type water reducing agent;
wherein the polycarboxylic acid water reducing agent is an acrylic acid polycarboxylic acid water reducing agent, and the solid content is 40%;
the particle size range of the nano silicon dioxide is 25-35 nm;
the fineness of the diatomite is 300-500 meshes.
Example 4
An early strength type water reducing agent prepared by the following method is prepared by adding 95g of polycarboxylic acid water reducing agent, 35g of calcium chloride, 20g of corn straw powder, 6g of silica fume, 17g of fly ash, 5.5g of nano-silica, 22g of diatomite, 12g of paraffin particles and 55g of water into a stirrer to be uniformly stirred, and obtaining the early strength type water reducing agent;
wherein the polycarboxylic acid water reducing agent is an acrylic acid polycarboxylic acid water reducing agent, and the solid content is 40%;
the particle size range of the nano silicon dioxide is 25-35 nm;
the fineness of the diatomite is 300-500 meshes.
Example 5
An early strength type water reducing agent prepared by adopting the following method is prepared by adding 80g of polycarboxylic acid water reducing agent, 50g of calcium chloride, 10g of corn straw powder, 8g of silica fume, 12g of fly ash, 8g of nano-silica, 15g of diatomite, 15g of paraffin particles and 40g of water into a stirrer to be uniformly stirred to obtain the early strength type water reducing agent;
wherein the polycarboxylic acid water reducing agent is an acrylic acid polycarboxylic acid water reducing agent, and the solid content is 40%;
the particle size range of the nano silicon dioxide is 25-35 nm;
the fineness of the diatomite is 300-500 meshes.
Example 6
The early strength type water reducing agent prepared by the following method is different from the embodiment 3 in that 14g of fly ash and 7g of nano silicon dioxide are adopted, namely the weight ratio of the fly ash to the nano silicon dioxide is 2.
Example 7
The early strength type water reducing agent prepared by the following method is different from the embodiment 3 in that 15g of fly ash and 6g of nano silicon dioxide are adopted, namely the weight ratio of the fly ash to the nano silicon dioxide is 2.5.
Example 8
The early strength type water reducing agent prepared by the following method is different from the embodiment 3 in that 15g of fly ash and 5g of nano silicon dioxide are adopted, namely the weight ratio of the fly ash to the nano silicon dioxide is 3.
Example 9
The early strength type water reducing agent is prepared by the following method, and is different from the embodiment 3 in that modified diatomite is adopted as the diatomite, and the modification method comprises the following steps:
s1: calcining diatomite at 850 ℃ for 10 h;
s2: soaking the calcined diatomite in the step S1 in a sodium hydroxide solution with the mass concentration of 3% for 5 hours;
s3: and (4) soaking the diatomite soaked in the sodium hydroxide solution in the step S2 in a hydrochloric acid solution with the molar concentration of 1mol/L for 1 hour, and then cleaning with clear water until the cleaning solution is neutral.
Example 10
The early strength type water reducing agent is prepared by the following method, and is different from the embodiment 3 in that modified diatomite is adopted as the diatomite, and the modification method comprises the following steps:
s1: calcining diatomite at 900 ℃ for 12 h;
s2: soaking the calcined diatomite in the step S1 in a sodium hydroxide solution with the mass concentration of 3.5% for 6 hours;
s3: and (4) soaking the diatomite soaked in the sodium hydroxide solution in the step S2 in a hydrochloric acid solution with the molar concentration of 2mol/L for 2 hours, and then cleaning with clear water until the cleaning solution is neutral.
Example 11
The early strength type water reducing agent is prepared by the following method, and is different from the embodiment 3 in that modified diatomite is adopted as the diatomite, and the modification method comprises the following steps:
s1: calcining diatomite at 950 ℃ for 15 h;
s2: soaking the calcined diatomite in the step S1 in a sodium hydroxide solution with the mass concentration of 4% for 8 hours;
s3: and (4) soaking the diatomite soaked in the sodium hydroxide solution in the step S2 in a hydrochloric acid solution with the molar concentration of 3mol/L for 3 hours, and then cleaning with clear water until the cleaning solution is neutral.
Comparative example 1
The water reducing agent prepared by the preparation method in the embodiment 1 of the early-strength polycarboxylic acid high-performance water reducing agent disclosed in the Chinese patent with the publication number of CN103304181A comprises the following steps: taking 320g of acrylic polycarboxylic acid water reducer (which is LonS-Mw water-reducing polycarboxylic acid mother liquor, is acrylic acid, has the solid content of 40 percent, is produced by Szechwan Jilong chemical building materials Co., Ltd., and has the production batch number of 20121214-0) and 990g of water, uniformly mixing, sequentially adding 40g of triethanolamine, 300g of calcium chloride and 350g of sodium nitrite, and uniformly stirring to obtain the water reducer; wherein the purity of the calcium chloride is 91 wt%, the purity of the sodium nitrite is 99 wt%, and the purity of the triethanolamine is 99 wt%.
Comparative example 2
The early strength type water reducing agent prepared by the following method is different from the embodiment 7 in that 12g of fly ash and 8g of nano silicon dioxide are adopted, namely the weight ratio of the fly ash to the nano silicon dioxide is 1.5.
Comparative example 3
The early strength water reducing agent prepared by the following method is different from the water reducing agent prepared in example 7 in that 17.5g of fly ash and 5g of nano silicon dioxide are adopted, namely the weight ratio of the fly ash to the nano silicon dioxide is 3.5.
Comparative example 4
An early strength type water reducing agent prepared by the following method is different from the water reducing agent prepared in example 3 in that the corn straw powder is not added.
Comparative example 5
An early strength type water reducing agent prepared by the following method is different from example 3 in that no paraffin particles are added.
Performance detection
The early strength type water reducing agents prepared in examples 1 to 11 and comparative examples 1 to 5 were mixed with cement, natural sand, crushed stone, mineral powder and water to prepare concrete, and the properties of the concrete were measured by the following methods.
Firstly, the compressive strength is measured by manufacturing a standard test block according to GB/T50081-2016 standard of test method for mechanical property of common concrete and curing the standard test block for 1d, 3d and 7 d.
Sulfate erosion resistance and chloride ion permeation resistance: according to a sulfate corrosion resistance test method and a chloride ion permeability resistance test method in GB/T50082-2009 Standard test method for testing the long-term performance and the durability of common concrete.
Thirdly, the early crack resistance is realized by manufacturing a standard test block according to GB/T50081-2016 standard of common concrete mechanical property test method, and calculating the number of cracks in unit area and the total crack area in unit area measured 24h after concrete pouring.
Fourthly, the splitting resistance strength: and (3) manufacturing a standard test block according to GB/T50081-2016 standard of common concrete mechanical property test methods, and measuring the cleavage resistance of the standard test block for 7d and 28d of maintenance.
The test results of the concrete prepared using the early strength type water reducing agent of examples 1 to 11 and comparative examples 1 to 5 are shown in Table 1.
Table 1 concrete Property test data
As can be seen from Table 1, the early compressive strength, the early cracking resistance, the sulfuric acid corrosion resistance and the chloride ion penetration resistance of the examples 1 to 11 are all superior to those of the comparative examples 1 to 5, which shows that the interrelation among the formulations of the early strength water reducing agent of the invention is scientific and reasonable, the hydration speed of cement can be accelerated, the early strength of concrete can be improved, meanwhile, the early cracking resistance, the sulfate corrosion resistance and the chloride ion corrosion resistance of concrete can be effectively improved, and the durability of concrete can be improved.
Compared with the example 3 and the comparative examples 2 to 3, the early compressive strength, the early crack resistance, the sulfuric acid corrosion resistance and the chloride ion permeation resistance of the examples 6 to 8 are superior to those of the examples 3 and the comparative examples 2 to 3, and the weight ratio of the fly ash to the nano-silica is 2 to 3, so that the fly ash and the nano-silica are more reasonably matched with each other, the early compressive strength, the early crack resistance, the sulfuric acid corrosion resistance and the chloride ion permeation resistance of the prepared concrete are further improved, and the durability of the concrete is improved.
Compared with the example 3, the early compressive strength, the early cracking resistance, the sulfuric acid corrosion resistance and the chloride ion permeation resistance of the examples 9 to 11 are all superior to those of the example 3, which shows that the modified diatomite can increase the adsorptivity, reduce the alkali ion concentration in concrete and reduce the alkali reaction of aggregate, and meanwhile, the modified diatomite has improved reaction activity and is matched with other components to further increase the hydration speed of cement and improve the early strength of concrete.
Compared with the embodiment 3, the concrete in the embodiment 3 has various performances superior to those in the embodiment 4, which shows that the corn straw powder and the components have synergistic effect, so that the early compressive strength, the early cracking resistance, the sulfuric acid corrosion resistance and the chloride ion permeability resistance of the concrete can be improved, and the durability of the concrete can be improved.
Compared with the example 3, the concrete in the example 3 has various performances superior to those in the comparative example 5, and the matching and synergistic effect of the paraffin wax particles and the components are proved to improve the early compressive strength, the early cracking resistance, the sulfuric acid corrosion resistance and the chloride ion permeability resistance of the concrete, thereby being beneficial to improving the durability of the concrete.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The early strength type water reducing agent is characterized by comprising, by weight, 80-100 parts of a polycarboxylic acid water reducing agent, 30-50 parts of calcium chloride, 10-25 parts of corn straw powder, 5-8 parts of silica fume, 12-18 parts of fly ash, 5-8 parts of nano silicon dioxide, 15-25 parts of diatomite, 10-15 parts of paraffin particles and 40-60 parts of water;
the diatomite is modified diatomite, and the modification method comprises the following steps:
s1: calcining the diatomite at 850-950 ℃ for 10-15 h;
s2: soaking the calcined diatomite in the step S1 in alkali liquor for 5-8 h;
s3: and (5) soaking the diatomite soaked in the alkali liquor in the step S2 in an acid liquor for 1-3h, and then cleaning until the cleaning liquor is neutral.
2. The early strength type water reducing agent according to claim 1, characterized by comprising, by weight, 85-95 parts of a graphene oxide modified polycarboxylic acid water reducing agent, 35-45 parts of calcium chloride, 15-20 parts of corn straw powder, 6-7 parts of silica fume, 15-17 parts of fly ash, 5.5-7 parts of nano silica, 18-22 parts of diatomite, 12-14 parts of paraffin particles, and 45-55 parts of water.
3. The early strength water reducing agent according to claim 1, characterized in that: the weight ratio of the fly ash to the nano silicon dioxide is 2-3.
4. The early strength water reducing agent according to claim 1, characterized in that: the alkali liquor in the step S2 adopts 3-4% sodium hydroxide solution by mass concentration; the acid solution in the step S3 is hydrochloric acid solution with the molar concentration of 1-3 mol/L.
5. The early strength water reducing agent according to claim 1, characterized in that: the particle size range of the nano silicon dioxide is 25-35 nm.
6. The early strength water reducing agent according to claim 1, characterized in that: the polycarboxylic acid water reducing agent is an acrylic acid polycarboxylic acid water reducing agent, and the solid content is 35-40%.
7. A production process of the early strength water reducing agent of any one of claims 1 to 6, which is characterized by comprising the following steps: and uniformly mixing the raw materials to obtain the water reducer.
8. The use of an early strength water reducer according to any one of claims 1 to 6 in building materials.
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| CN104844062B (en) * | 2015-04-29 | 2017-03-22 | 浙江大学 | Nano modified cement mixing pile additive suitable for ocean rock-soil environment and preparation method of additive |
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Inventor after: Wang Qian Inventor after: Ma Junmin Inventor after: Li Zhiliang Inventor after: Luo Zilong Inventor after: Zhang Yeming Inventor after: Zhang Luyao Inventor after: Fu Haiping Inventor after: Zhang Sanfeng Inventor after: Xu Yundong Inventor after: Zhang Ji Inventor after: Lu Haifeng Inventor before: Wang Qian Inventor before: Luo Zilong Inventor before: Zhang Yeming Inventor before: Zhang Luyao Inventor before: Fu Haiping Inventor before: Zhang Sanfeng Inventor before: Xu Yundong Inventor before: Lu Haifeng Inventor before: Ma Junmin |