CN113620667A - High-weather-resistance low-shrinkage concrete and preparation method thereof - Google Patents
High-weather-resistance low-shrinkage concrete and preparation method thereof Download PDFInfo
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- CN113620667A CN113620667A CN202111042221.1A CN202111042221A CN113620667A CN 113620667 A CN113620667 A CN 113620667A CN 202111042221 A CN202111042221 A CN 202111042221A CN 113620667 A CN113620667 A CN 113620667A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses a high-weather-resistance low-shrinkage concrete and a preparation method thereof, and relates to the technical field of polymer concrete. The invention discloses a high-weather-resistance low-shrinkage concrete which is prepared from the following raw materials in parts by weight: 150-210 parts of ordinary portland cement, 350-430 parts of coarse aggregate, 330 parts of fine aggregate, 40-50 parts of metakaolin, 70-80 parts of limestone powder, 20-30 parts of rice hull powder, 3-5 parts of a polycarboxylic acid water reducing agent, 15-20 parts of a composite expanding agent, 8-15 parts of vinyl acetate/diatomite hydrogel, 10-20 parts of polyaspartic acid ester resin and 50-70 parts of water. The invention provides the concrete with high weather resistance and low shrinkage, and the concrete has excellent compressive strength and crack resistance and prolongs the service life of the concrete.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to low-shrinkage concrete with high weather resistance and a preparation method thereof.
Background
The concrete is an artificial stone which is prepared by a cementing material, granular aggregate (also called aggregate), water, additive and admixture which are added if necessary according to a certain proportion, and the artificial stone is formed by uniform stirring, compact forming, curing and hardening. The concrete has the characteristics of rich raw materials, low price and simple production process, simultaneously has the characteristics of high compressive strength, good durability, wide strength grade range and the like, and is a very wide base material in the field of modern building engineering. However, concrete is easy to shrink and crack in the process of pouring and curing, and particularly when the concrete has the characteristics of large cement dosage, low water-cement ratio and the like, the subsequent hydration heat release is high, the self-shrinkage is large, the shrinkage and cracking are severe, and the development and application of the concrete are greatly restricted. Therefore, the search for an effective method to reduce the shrinkage cracking problem of concrete is an important issue of constant attention and research in the concrete field.
It is known that concrete is exposed to the erosion of the external environment for a long time in the using process, wherein chlorine salt erosion, acid rain damage, sunlight exposure and the like are main causes of the reduction of the durability of the concrete structure, and finally the safety of the engineering structure is endangered. Therefore, under the environment of corrosion, insolation or low temperature, the safe use of the concrete structure within the designed service life cannot be ensured only by improving the quality and the thickness of the concrete protective layer material. The main methods for improving the weather resistance of concrete at present comprise: good effects are achieved by using a steel bar rust inhibitor, concrete cathode protection, stainless steel bars, steel bar surface coatings, corrosion resistant steel bars and the like, but the methods have high cost. The prior art also improves the durability and weather resistance of concrete by adding a coating on the surface of the concrete, but the conventional surface protective coatings represented by epoxy coatings and polyurethane coatings have more defects, poor durability, limited high weather resistance and the like. Therefore, the development of a concrete with good weather resistance and low shrinkage is the main research object of the invention.
Disclosure of Invention
The invention mainly aims to provide concrete with high weather resistance and low shrinkage, and the concrete has excellent compressive strength and crack resistance and prolongs the service life of the concrete.
In order to realize the purpose of the invention, the invention provides a low-shrinkage concrete with high weather resistance, which is composed of the following raw materials in parts by weight: 150-210 parts of ordinary portland cement, 350-430 parts of coarse aggregate, 330 parts of fine aggregate, 40-50 parts of metakaolin, 70-80 parts of limestone powder, 20-30 parts of rice hull powder, 3-5 parts of a polycarboxylic acid water reducing agent, 15-20 parts of a composite expanding agent, 8-15 parts of vinyl acetate/diatomite hydrogel, 10-20 parts of polyaspartic acid ester resin and 50-70 parts of water.
Further, the strength grade of the ordinary portland cement is 42.5 grade; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
Further, the composite expanding agent is prepared by compounding ettringite and talcum powder, wherein the weight ratio of the ettringite to the talcum powder is (2-4): 1.
further, the vinyl acetate/diatomite hydrogel is a hydrogel formed by compounding vinyl acetate and diatomite.
Further, the preparation method of the vinyl acetate/diatomite hydrogel comprises the following steps: adding diatomite, N' -methylene bisacrylamide and deionized water into a reaction kettle, uniformly stirring, then adding vinyl acetate and an initiator, heating to 70-80 ℃, stirring for reaction for 3-4h, cooling, neutralizing with 1mol/L NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, then dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product.
Further, the proportion of the diatomite to the vinyl acetate is 100-150g/L, and the mass ratio of the diatomite to the N, N' -methylene bisacrylamide is 1: (0.1-0.3), the ratio of the diatomite to the deionized water is 10-15g/L, and the mass ratio of the diatomite to the initiator is 1: (0.03-0.05).
The invention also provides a preparation method of the low-shrinkage concrete with high weather resistance, which comprises the following steps:
(1) weighing the raw material components in parts by weight;
(2) adding ordinary portland cement, metakaolin, limestone powder and rice hull ash into a stirrer, dry-stirring for 3-5min, and then adding coarse aggregate and fine aggregate, and uniformly mixing;
(3) and (3) sequentially adding a polycarboxylic acid water reducing agent, a composite expanding agent and water into the mixture prepared in the step (2), stirring for 3-5min, slowly stirring while sequentially adding the vinyl acetate/diatomite hydrogel and the polyaspartic acid ester resin, and quickly stirring for 3-4min to obtain the high-weather-resistance low-shrinkage concrete.
The invention achieves the following beneficial effects:
1. a vinyl acetate/diatomite hydrogel is a cross-linked polymer which can swell in water and retain a certain amount of water, is insoluble in water and has a three-dimensional network structure, wherein the contained strongly water-absorbing groups such as carboxyl groups and hydroxyl groups can absorb liquid water tens to thousands of times of the self weight through hydration with water, and the water-absorbing groups are in a gel state, and free water can be fixed in the polymer network through swelling, so that the hydrogel has good water retention performance under pressurization and can slowly release water under a dry environment. Therefore, the vinyl acetate/diatomite hydrogel is doped into the concrete, and the chemical shrinkage of the concrete can be counteracted by controlling the moisture in the concrete, the self-shrinkage of the concrete can be effectively reduced, the early shrinkage cracking of the concrete is effectively inhibited, the durability is improved, and the service life of the concrete is further prolonged. The hydrogel contains diatomite components, has good cohesiveness, can improve the adhesive force of other components in concrete, increases the strength of the concrete, and also improves the water resistance and heat preservation of the invention.
2. By adding the polyaspartic acid ester resin, the weather resistance of the concrete is obviously improved, and the bonding force among the components is also improved due to the excellent bonding property, so that the strength of the concrete is improved, and the shrinkage cracking probability is reduced.
3. According to the invention, through compounding of cement, metakaolin, limestone powder and rice husk ash, the self-shrinkage of concrete is reduced, the pore structure is refined, the fluidity of concrete is improved, and the compressive strength of the concrete is further improved.
4. According to the invention, the polycarboxylate water reducing agent, the composite expanding agent and the vinyl acetate/diatomite hydrogel are adopted and matched according to a certain proportion and formula, so that on one hand, the concrete modifier is used for improving the rheological property of concrete, can reduce the phenomena of bleeding and segregation, and further improves the workability of the concrete; on the other hand, the shrinkage properties of the concrete are also further improved.
5. The invention adopts the coarse aggregate and the fine aggregate with proper grain diameter and proportion, effectively reduces the self-shrinkage of the concrete, reduces the porosity inside the concrete, makes the inside of the concrete more compact, further reduces the cracks inside the concrete, and improves the crack resistance, seepage resistance and compressive strength of the concrete.
6. The high weather-resistant low-shrinkage concrete disclosed by the invention is simple in preparation method, has good mechanical properties, heat preservation, ageing resistance and is easy to maintain and wide in application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the 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.
The polyaspartic acid ester resin adopted by the invention is produced by a universal technology in the Fushan City, and the model is WH-1520; metakaolin is provided by Guishou county Jiashuo building materials processing, Inc.; the limestone powder is provided by Yongman lime plant in east Bao area of Jingmen; the rice hull ash is provided by Shijiazhuang Song agricultural planting Co., Ltd; polycarboxylic acid water reducing agents are provided by bosk chemical corporation, Shandong.
Example 1
A preparation method of low-shrinkage concrete with high weather resistance comprises the following steps:
(1) weighing 15kg of ordinary portland cement, 5kg of metakaolin, 8kg of limestone powder and 3kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing for 5min, then sequentially adding 43kg of coarse aggregate and 33kg of fine aggregate, stirring for 5min at the stirring speed of 600rpm, and obtaining a dry material mixture;
(2) then, sequentially adding 0.5kg of polycarboxylic acid water reducing agent and 1.5kg of composite expanding agent into the dry material mixture, stirring for 2min at the stirring speed of 600rpm, then adding 7kg of water, and stirring for 3min at the stirring speed of 1000 rpm;
(3) setting the stirring speed of the concrete stirrer to 200rpm, then sequentially adding 1kg of vinyl acetate/diatomite hydrogel and 2kg of polyaspartic acid ester resin into the concrete stirrer, stirring for 2min, adjusting the stirring speed to 1200rpm, stirring for 4min, and then unloading to obtain the finished concrete.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared by mixing, by mass, 2: 1, and talcum powder.
The vinyl acetate/diatomite hydrogel in this example is a hydrogel formed by compounding vinyl acetate and diatomite, and the preparation method thereof is as follows: adding 1kg of diatomite, 100g of N, N' -methylene bisacrylamide and 100L of deionized water into a reaction kettle, uniformly stirring, then adding 10L of vinyl acetate and 30g of initiator, heating to 80 ℃, stirring for reaction for 4 hours, cooling, neutralizing with 1mol/L of NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product. The initiator is ammonium persulfate and sodium sulfite, and the mass ratio is 2: 1.
example 2
A preparation method of low-shrinkage concrete with high weather resistance comprises the following steps:
(1) weighing 21kg of ordinary portland cement, 4kg of metakaolin, 7kg of limestone powder and 2kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing for 5min, then sequentially adding 25kg of coarse aggregate and 28kg of fine aggregate, stirring for 5min at the stirring speed of 600rpm, and obtaining a dry material mixture;
(2) then, sequentially adding 0.3kg of polycarboxylic acid water reducing agent and 1.8kg of composite expanding agent into the dry material mixture, stirring for 2min at the stirring speed of 600rpm, then adding 5kg of water, and stirring for 5min at the stirring speed of 1000 rpm;
(3) setting the stirring speed of the concrete stirrer to 200rpm, then sequentially adding 1.5kg of vinyl acetate/diatomite hydrogel and 1kg of polyaspartic acid ester resin into the concrete stirrer, stirring for 2min, adjusting the stirring speed to 1200rpm, stirring for 4min, and then discharging to obtain the finished concrete.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared from 4: 1, and talcum powder.
The vinyl acetate/diatomite hydrogel in this example is a hydrogel formed by compounding vinyl acetate and diatomite, and the preparation method thereof is as follows: adding 1.5kg of diatomite, 450g of N, N' -methylene bisacrylamide and 100L of deionized water into a reaction kettle, uniformly stirring, then adding 10L of vinyl acetate and 75g of initiator, heating to 80 ℃, stirring for reaction for 4 hours, cooling, neutralizing with 1mol/L of NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product. The initiator is ammonium persulfate and sodium sulfite, and the mass ratio is 2: 1.
example 3
A preparation method of low-shrinkage concrete with high weather resistance comprises the following steps:
(1) weighing 18kg of ordinary portland cement, 4.5kg of metakaolin, 8kg of limestone powder and 2kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing and mixing, wherein the stirring time is 5min, then sequentially adding 40kg of coarse aggregate and 32kg of fine aggregate, the stirring time is 5min, and the stirring speed is 600rpm, so as to obtain a dry material mixture;
(2) then, sequentially adding 0.5kg of polycarboxylic acid water reducing agent and 2kg of composite expanding agent into the dry material mixture, stirring for 2min at the stirring speed of 600rpm, then adding 6kg of water, and stirring for 5min at the stirring speed of 1000 rpm;
(3) setting the stirring speed of the concrete stirrer to 200rpm, then sequentially adding 0.8kg of vinyl acetate/diatomite hydrogel and 1.5kg of polyaspartic acid ester resin into the concrete stirrer, stirring for 2min, adjusting the stirring speed to 1200rpm, stirring for 4min, and then discharging to obtain the finished concrete.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared from 3: 1, and talcum powder.
The vinyl acetate/diatomite hydrogel in this example is a hydrogel formed by compounding vinyl acetate and diatomite, and the preparation method thereof is as follows: adding 1.2kg of diatomite, 240g of N, N' -methylene bisacrylamide and 100L of deionized water into a reaction kettle, uniformly stirring, then adding 10L of vinyl acetate and 48g of initiator, heating to 80 ℃, stirring for reaction for 4 hours, cooling, neutralizing with 1mol/L of NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product. The initiator is ammonium persulfate and sodium sulfite, and the mass ratio is 2: 1.
example 4
A preparation method of low-shrinkage concrete with high weather resistance comprises the following steps:
(1) weighing 20kg of ordinary portland cement, 4.5kg of metakaolin, 7.5kg of limestone powder and 3kg of rice hull ash, adding the materials into a concrete stirrer for dry-mixing and mixing, wherein the stirring time is 5min, then sequentially adding 35kg of coarse aggregate and 30kg of fine aggregate, the stirring time is 5min, and the stirring speed is 600rpm, thus obtaining a dry material mixture;
(2) then, sequentially adding 0.4kg of polycarboxylic acid water reducing agent and 1.6kg of composite expanding agent into the dry material mixture, stirring for 2min at the stirring speed of 600rpm, then adding 6kg of water, and stirring for 5min at the stirring speed of 1000 rpm;
(3) setting the stirring speed of the concrete stirrer to 200rpm, then sequentially adding 1.2kg of vinyl acetate/diatomite hydrogel and 1.5kg of polyaspartic acid ester resin into the concrete stirrer, stirring for 2min, adjusting the stirring speed to 1200rpm, stirring for 4min, and then discharging to obtain the finished concrete.
In the embodiment, the strength of the ordinary portland cement is p.o.42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
The composite expanding agent used in the present embodiment is prepared from 3: 1, and talcum powder.
The vinyl acetate/diatomite hydrogel in this example is a hydrogel formed by compounding vinyl acetate and diatomite, and the preparation method thereof is as follows: adding 1.25kg of diatomite, 300g of N, N' -methylene bisacrylamide and 125L of deionized water into a reaction kettle, uniformly stirring, then adding 10L of vinyl acetate and 55g of initiator, heating to 80 ℃, stirring for reaction for 4 hours, cooling, neutralizing with 1mol/L of NaOH solution until the neutralization degree is 90%, repeatedly washing and soaking with distilled water, dehydrating with ethanol, and drying in a 70 ℃ oven to constant weight to obtain the product. The initiator is ammonium persulfate and sodium sulfite, and the mass ratio is 2: 1.
comparative example 1
The raw material composition, formulation and preparation method of the concrete of comparative example 1 were the same as those of example 4, except that the vinyl acetate/diatomaceous earth hydrogel was not added in comparative example 1.
Comparative example 2
The raw material components, the compounding ratio and the preparation method of the concrete of this comparative example 2 were the same as those of example 4, except that the vinyl acetate/diatomaceous earth hydrogel and the polyaspartic acid ester resin were not added in this comparative example 2.
The concrete produced according to examples 1 to 4 and comparative examples 1 to 2 were tested for compression strength, flexural strength, shrinkage of 30d, acid resistance of 30d (5% hydrochloric acid), alkali resistance of 30d (5% sodium hydroxide solution), sulfate resistance of 30d (5% sodium sulfate), etc., and the results are shown in Table 1 below.
TABLE 1 test results of various properties of concrete
The test results in table 1 show that after the vinyl acetate/diatomite hydrogel or the polyaspartic acid ester resin is added, the shrinkage rate of the concrete is reduced, the compressive strength and the acid and alkali salt resistance of the concrete are improved, and the service life of the concrete is prolonged.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. The high-weather-resistance low-shrinkage concrete is characterized by comprising the following raw materials in parts by weight: 150-210 parts of ordinary portland cement, 350-430 parts of coarse aggregate, 330 parts of fine aggregate, 40-50 parts of metakaolin, 70-80 parts of limestone powder, 20-30 parts of rice hull powder, 3-5 parts of a polycarboxylic acid water reducing agent, 15-20 parts of a composite expanding agent, 8-15 parts of vinyl acetate/diatomite hydrogel, 10-20 parts of polyaspartic acid ester resin and 50-70 parts of water.
2. The high weatherability and low shrinkage concrete according to claim 1, wherein the ordinary portland cement is of a strength grade of 42.5; the coarse aggregate is 10-20 mm of continuous basalt macadam; the fine aggregate is reclaimed sand, and the fineness modulus of the reclaimed sand is 2.3-2.7.
3. The high-weather-resistance low-shrinkage concrete as claimed in claim 1, wherein the composite expanding agent is prepared by compounding ettringite and talcum powder, and the mass ratio of the ettringite to the talcum powder is (2-4): 1.
4. the high weatherability low shrinkage concrete according to claim 1, wherein the vinyl acetate/diatomite hydrogel is a hydrogel formed by combining vinyl acetate and diatomite.
5. The high weatherability low shrinkage concrete according to claim 4, wherein the vinyl acetate/diatomite hydrogel is prepared by: adding diatomite, N' -methylene bisacrylamide and deionized water into a reaction kettle, uniformly stirring, then adding vinyl acetate and an initiator, heating to 70-80 ℃, stirring for reaction for 3-4h, cooling, neutralizing with 1mol/L NaOH solution until the neutralization degree is 90%, removing the solvent, dehydrating with ethanol, and drying to obtain the catalyst.
6. The concrete as claimed in claim 5, wherein the ratio of the diatomite to the vinyl acetate is 100-150g/L, and the mass ratio of the diatomite to the N, N' -methylenebisacrylamide is 1: (0.1-0.3), the ratio of the diatomite to the deionized water is 10-15g/L, and the mass ratio of the diatomite to the initiator is 1: (0.03-0.05).
7. The method for preparing highly weatherable low shrinkage concrete according to any one of claims 1 to 6, which comprises the following steps:
(1) weighing the raw material components in parts by weight;
(2) adding ordinary portland cement, metakaolin, limestone powder and rice hull ash into a stirrer, dry-stirring for 3-5min, and then adding coarse aggregate and fine aggregate, and uniformly mixing;
(3) and (3) sequentially adding a polycarboxylic acid water reducing agent, a composite expanding agent and water into the mixture prepared in the step (2), stirring for 3-5min, slowly stirring while sequentially adding the vinyl acetate/diatomite hydrogel and the polyaspartic acid ester resin, and rapidly stirring for 3-4min to obtain the required concrete.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114213085A (en) * | 2022-01-05 | 2022-03-22 | 佛山市顺德区佳润士涂料实业有限公司 | Micro-cement, micro-cement ground structure and construction method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111302733A (en) * | 2020-03-13 | 2020-06-19 | 中铁大桥科学研究院有限公司 | Low-shrinkage creep wet joint ultra-high-strength concrete material and preparation method thereof |
-
2021
- 2021-09-07 CN CN202111042221.1A patent/CN113620667A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111302733A (en) * | 2020-03-13 | 2020-06-19 | 中铁大桥科学研究院有限公司 | Low-shrinkage creep wet joint ultra-high-strength concrete material and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 中国建筑学会混凝土外加剂应用技术专业委员会: "《混凝土外加剂及其应用技术新进展》", 30 June 2009, 北京理工大学出版社 * |
| 刘永兵等: "《互穿网络聚合物凝胶调驱技术》", 31 March 2008, 中国石油大学出版社 * |
| 吴潮玮等: "《建筑材料》", 31 January 2018, 北京理工大学出版社 * |
| 夏伯才: "《土木工程材料》", 28 February 2013, 中山大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114213085A (en) * | 2022-01-05 | 2022-03-22 | 佛山市顺德区佳润士涂料实业有限公司 | Micro-cement, micro-cement ground structure and construction method thereof |
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Application publication date: 20211109 |