CN111333366B - Seawater-resistant reinforced concrete admixture and preparation method thereof - Google Patents
Seawater-resistant reinforced concrete admixture and preparation method thereof Download PDFInfo
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- CN111333366B CN111333366B CN202010242225.3A CN202010242225A CN111333366B CN 111333366 B CN111333366 B CN 111333366B CN 202010242225 A CN202010242225 A CN 202010242225A CN 111333366 B CN111333366 B CN 111333366B
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 29
- 239000013535 sea water Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 78
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 54
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims abstract description 21
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims abstract description 21
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920001661 Chitosan Polymers 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 20
- XFJRTXJMYXFAEE-UHFFFAOYSA-K [Cr+3].CC(O)C([O-])=O.CC(O)C([O-])=O.CC(O)C([O-])=O Chemical compound [Cr+3].CC(O)C([O-])=O.CC(O)C([O-])=O.CC(O)C([O-])=O XFJRTXJMYXFAEE-UHFFFAOYSA-K 0.000 claims abstract description 16
- 238000003763 carbonization Methods 0.000 claims abstract description 14
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 13
- 239000000378 calcium silicate Substances 0.000 claims abstract description 13
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 13
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 13
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 13
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 13
- 238000004537 pulping Methods 0.000 claims description 18
- 230000008961 swelling Effects 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 210000001724 microfibril Anatomy 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 239000000725 suspension Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 229920002678 cellulose Polymers 0.000 claims description 7
- 239000001913 cellulose Substances 0.000 claims description 7
- 229920001131 Pulp (paper) Polymers 0.000 claims description 6
- 238000004108 freeze drying Methods 0.000 claims description 6
- 239000011121 hardwood Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 40
- RRDQTXGFURAKDI-UHFFFAOYSA-N formaldehyde;naphthalene-2-sulfonic acid Chemical compound O=C.C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 RRDQTXGFURAKDI-UHFFFAOYSA-N 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- ULODLFDKFVIYFY-UHFFFAOYSA-N naphthalene-2-sulfonic acid;sodium Chemical compound [Na].C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 ULODLFDKFVIYFY-UHFFFAOYSA-N 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses an anti-seawater reinforced concrete admixture and a preparation method thereof, and is characterized by comprising the following raw materials of 70-80 parts by mass of beta-naphthalene sulfonate formaldehyde polycondensate, 5-10 parts by mass of chitosan, 4-7 parts by mass of calcium silicate, 2-8 parts by mass of silane coupling agent, 1-2 parts by mass of polyvinylpyrrolidone, 1-2 parts by mass of chromium lactate, 3-5 parts by mass of carbonized microfibrillated fiber, 1-3 parts by mass of rosin thermopolymer and 1-3 parts by mass of zirconia fiber; the carbonized microfibrillated fiber is a product obtained by carrying out high-temperature anaerobic carbonization on microfibrillated plant fiber. The seawater-resistant reinforced concrete admixture further improves the flexural strength and the compressive strength of concrete in a high-salinity environment.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a seawater-resistant reinforced concrete admixture and a preparation method thereof.
Background
The total length of the Chinese coastline is 3.2 ten thousand meters, wherein the continental coastline is 1.8 ten thousand meters, the island coastline is 1.4 ten thousand meters, numerous estuaries are provided, the coastal cities are chess cloths, a large number of goods trades are transported out by sea, the throughput of ports is improved year by year, and in synchronization with the improvement, the construction of seawalls and harbors is also rapidly increased.
The concrete is the most widely used building material in modern times, and has the advantages of rich raw materials, low price, simple process, high strength, good durability and the like. The premixed concrete is one kind of concrete, and is concrete mixture which is prepared with cement, aggregate, water, additive, mineral admixture and other components in certain proportion, and through metering, mixing and other steps. Because of the great environmental impact of site operations, ready mixed concrete is receiving increasing attention. However, since the concrete materials are chemically reacted with time after mixing, and the fluidity, slump loss, workability, and the like of the concrete are adversely affected, the ready-mixed concrete must be transported to a desired site within a predetermined time, and the performance of the concrete is also required to be further improved.
In order to ensure the performance of the concrete, various additives with different performances can be added to adjust and improve the performance of the concrete. The existing seawater-resistant reinforced concrete admixture can play a role in reducing mixing water, increasing workability, controlling setting time, early strength, enhancing, durability, dyeing, air entraining and the like, but the admixture generally has single performance, cannot meet various requirements, and does not have an admixture capable of effectively reducing the influence of high-mud-content sand on the performance of concrete. The application prospect of the ready-mixed concrete can be wider through the use of the additive and the optimization of the concrete formula.
The concrete is widely applied to engineering structures of bridges, tunnels, production plants, office buildings and the like of railways and highways in salt lake areas and saline land areas. The serious corrosion of various salts to concrete in the salt lake area has attracted great attention in the engineering field. How to adopt the corrosion-resistant admixture and the mineral admixture to prepare the concrete with high corrosion resistance has important significance on high durability, safety and prolonged service life of an engineering structure. At present, the variety and variety of concrete admixtures in China are many, but the anti-corrosion admixture products specially aiming at concrete structural engineering in salt lake areas and saline land areas are not recorded.
Disclosure of Invention
The invention provides a seawater-resistant reinforced concrete admixture and a preparation method thereof, which further solve the technical problem of improving the flexural strength and compressive strength of concrete in a high-salinity environment by optimizing the formula and components.
In order to solve the technical problems, the invention adopts the following technical scheme:
the seawater-resistant reinforced concrete admixture comprises the following raw materials in parts by mass: 70-80 parts of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5-10 parts of chitosan, 4-7 parts of calcium silicate, 2-8 parts of silane coupling agent, 1-2 parts of polyvinylpyrrolidone, 1-2 parts of chromium lactate, 3-5 parts of carbonized microfibrillated fiber, 1-3 parts of rosin thermopolymer and 1-3 parts of zirconia fiber; the carbonized microfibrillated fiber is a product obtained by carrying out high-temperature anaerobic carbonization on microfibrillated plant fiber.
Further, the weight ratio of the chitosan, the carbonized microfibrillated fiber, the rosin thermopolymer and the zirconia fiber is 4:2:1: 1.
Further, the average diameter of the zirconia fiber is 5-15 um.
Further, the average diameter of the carbonized microfibrillated fiber is 5 to 20 nm.
The preparation method of the seawater-resistant reinforced concrete admixture is characterized by comprising the following steps:
(1) chemical pulp of bleached hardwood is taken as a raw material, sent to a pulping machine for pulping and grinding, a pulp suspension is treated by using a disc mill, and a disc mill clearance treatment process with the size of 0.8-1.0mm is adopted in the swelling pretreatment stage, so that a swelling agent and fibers are fully mixed, and swelling is finished within 5-8 min; then gradually adjusting the disc mill clearance to 0.1-0.05mm, repeatedly pulping for 15-30min to complete microfibril separation, sending the microfibril suspension to a high-pressure homogenizer, circulating for 10-15 times under the condition of 40-60MPa, freeze-drying, and carrying out gradient temperature rise carbonization at 80, 120 and 250 ℃ under the Ar gas condition to obtain carbonized microfibrillated cellulose;
(2) mixing 70-80 parts by mass of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5-10 parts by mass of chitosan, 4-7 parts by mass of calcium silicate, 2-8 parts by mass of silane coupling agent, 1-2 parts by mass of polyvinylpyrrolidone, 1-2 parts by mass of chromium lactate, 3-5 parts by mass of carbonized microfibrillated fiber, 1-3 parts by mass of rosin thermopolymer and 1-3 parts by mass of zirconia fiber, uniformly mixing, inputting into a grinding machine, and grinding into powder with the specific surface area of 600m2More than kg.
The invention has the following beneficial effects:
1) the single fiber size of the carbonized microfibrillated fiber is about 4nm, the size of the cellulose is 20-60nm, after carbonization, the carbonized microfibrillated fiber has strong corrosion resistance and dispersibility, is not easy to agglomerate, can be used as a nucleating agent, can improve the crystallization property of concrete, has a wear-resisting effect, and is matched with zirconia fiber for use, so that the fiber dispersed filling effect with different sizes is realized, the mechanical property of the concrete is enhanced, and meanwhile, the carbonized microfibrillated fiber has strong water absorption and can be used as a supplement of a polycarboxylic acid reducing agent, so that the water reducing property of an additive is enhanced;
2) the zirconia fiber contains abundant metal oxides, can reduce the acidity of concrete, ensures that reinforcing steel bars of the concrete are not easy to corrode, and has high strength, extremely high thermodynamic stability and corrosion resistance effect, thereby improving the breaking strength and the compressive strength of the concrete;
3) the rosin thermopolymer is an air entraining agent, and the air entraining agent is added into the concrete to guide the air bubbles in the concrete to be reasonably and uniformly distributed and improve the air content of the concrete. For premixed concrete, the workability of the concrete can be effectively improved, under the condition of unchanged water consumption, the slump of the concrete can be increased by adding the air entraining agent, the setting speed is not obviously influenced, and the air entraining agent is matched with multi-scale fibers for use, so that the collapse resistance of the concrete is further enhanced;
4) the chitosan is used as a complexing agent and a cross-linking agent, the chromium lactate is used as an organic salt reinforcing agent, the generation of a network structure is further increased in the concrete forming process, the network structure is used as a nucleation core, gel is easily formed on the surface, and the corrosion resistance is enhanced.
Detailed Description
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
In the embodiment, the seawater-resistant reinforced concrete admixture comprises the following raw materials in parts by mass: 70-80 parts of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5-10 parts of chitosan, 4-7 parts of calcium silicate, 2-8 parts of silane coupling agent, 1-2 parts of polyvinylpyrrolidone, 1-2 parts of chromium lactate, 3-5 parts of carbonized microfibrillated fiber, 1-3 parts of rosin thermopolymer and 1-3 parts of zirconia fiber; the carbonized microfibrillated fiber is a product obtained by carrying out high-temperature anaerobic carbonization on microfibrillated plant fiber.
The preparation method of the seawater-resistant reinforced concrete admixture is characterized by comprising the following steps:
(1) chemical pulp of bleached hardwood is taken as a raw material, sent to a pulping machine for pulping and grinding, a pulp suspension is treated by using a disc mill, and a disc mill clearance treatment process with the size of 0.8-1.0mm is adopted in the swelling pretreatment stage, so that a swelling agent and fibers are fully mixed, and swelling is finished within 5-8 min; then gradually adjusting the disc mill clearance to 0.1-0.05mm, repeatedly pulping for 15-30min to complete microfibril separation, sending the microfibril suspension to a high-pressure homogenizer, circulating for 10-15 times under the condition of 40-60MPa, freeze-drying, and carrying out gradient temperature rise carbonization at 80, 120 and 250 ℃ under the Ar gas condition to obtain carbonized microfibrillated cellulose;
(2) mixing 70-80 parts by mass of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5-10 parts by mass of chitosan, 4-7 parts by mass of calcium silicate, 2-8 parts by mass of silane coupling agent, 1-2 parts by mass of polyvinylpyrrolidone, 1-2 parts by mass of chromium lactate, 3-5 parts by mass of carbonized microfibrillated fiber, 1-3 parts by mass of rosin thermopolymer and 1-3 parts by mass of zirconia fiber, uniformly mixing, inputting into a grinding machine, and grinding into powder with the specific surface area of 600m2More than kg.
The present invention is illustrated by the following more specific examples.
Example 1
The seawater-resistant reinforced concrete admixture comprises the following raw materials in parts by mass: 75 parts by mass of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 8 parts by mass of chitosan, 5 parts by mass of calcium silicate, 5 parts by mass of silane coupling agent, 1.5 parts by mass of polyvinylpyrrolidone, 1.5 parts by mass of chromium lactate, 4 parts by mass of carbonized microfibrillated fiber, 2 parts by mass of rosin thermopolymer and 2 parts by mass of zirconia fiber; the carbonized microfibrillated fiber is a product obtained by carrying out high-temperature anaerobic carbonization on microfibrillated plant fiber.
The weight ratio of the chitosan to the carbonized microfibrillated fiber to the rosin thermopolymer to the zirconia fiber is 4:2:1: 1.
The average diameter of the zirconia fiber is 5-15 um.
The average diameter of the carbonized microfibrillated fiber is 5-20 nm.
The preparation method of the seawater-resistant reinforced concrete admixture is characterized by comprising the following steps:
(1) chemical pulp of bleached hardwood is taken as a raw material, sent to a pulping machine for pulping and grinding, a pulp suspension is treated by using a disc mill, and a disc mill clearance treatment process with the size of 0.8-1.0mm is adopted in the swelling pretreatment stage, so that a swelling agent and fibers are fully mixed, and swelling is finished within 5-8 min; then gradually adjusting the disc mill clearance to 0.1-0.05mm, repeatedly pulping for 15-30min to complete microfibril separation, sending the microfibril suspension to a high-pressure homogenizer, circulating for 10-15 times under the condition of 40-60MPa, freeze-drying, and carrying out gradient temperature rise carbonization at 80, 120 and 250 ℃ under the Ar gas condition to obtain carbonized microfibrillated cellulose;
(2) mixing beta-sodium naphthalenesulfonate formaldehyde polycondensate, chitosan, calcium silicate, silane coupling agent, polyvinyl pyrrolidone, chromium lactate, carbonized microfibrillated fiber, rosin thermopolymer and zirconia fiber, grinding in a grinder to specific surface area of 600m2More than kg.
Example 2
The seawater-resistant reinforced concrete admixture comprises the following raw materials in parts by mass: 70 parts of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5 parts of chitosan, 7 parts of calcium silicate, 2 parts of silane coupling agent, 2 parts of polyvinylpyrrolidone, 1 part of chromium lactate, 5 parts of carbonized microfibrillated fiber, 1 part of rosin thermopolymer and 3 parts of zirconia fiber; the carbonized microfibrillated fiber is a product obtained by carrying out high-temperature anaerobic carbonization on microfibrillated plant fiber.
The average diameter of the zirconia fiber is 5-15 um.
The average diameter of the carbonized microfibrillated fiber is 5-20 nm.
The preparation method of the seawater-resistant reinforced concrete admixture is characterized by comprising the following steps:
(1) chemical pulp of bleached hardwood is taken as a raw material, sent to a pulping machine for pulping and grinding, a pulp suspension is treated by using a disc mill, and a disc mill clearance treatment process with the size of 0.8-1.0mm is adopted in the swelling pretreatment stage, so that a swelling agent and fibers are fully mixed, and swelling is finished within 5-8 min; then gradually adjusting the disc mill clearance to 0.1-0.05mm, repeatedly pulping for 15-30min to complete microfibril separation, sending the microfibril suspension to a high-pressure homogenizer, circulating for 10-15 times under the condition of 40-60MPa, freeze-drying, and carrying out gradient temperature rise carbonization at 80, 120 and 250 ℃ under the Ar gas condition to obtain carbonized microfibrillated cellulose;
(2) mixing beta-sodium naphthalenesulfonate formaldehyde polycondensate, chitosan, calcium silicate, silane coupling agent, polyvinyl pyrrolidone, chromium lactate, carbonized microfibrillated fiber, rosin thermopolymer and zirconia fiber, grinding in a grinder to specific surface area of 600m2More than kg.
Example 3
The seawater-resistant reinforced concrete admixture comprises the following raw materials in parts by mass: 80 parts of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5 parts of chitosan, 7 parts of calcium silicate, 2 parts of silane coupling agent, 2 parts of polyvinylpyrrolidone, 1 part of chromium lactate, 5 parts of carbonized microfibrillated fiber, 1 part of rosin thermopolymer and 3 parts of zirconia fiber; the carbonized microfibrillated fiber is a product obtained by carrying out high-temperature anaerobic carbonization on microfibrillated plant fiber.
The average diameter of the zirconia fiber is 5-15 um.
The average diameter of the carbonized microfibrillated fiber is 5-20 nm.
The preparation method of the seawater-resistant reinforced concrete admixture is characterized by comprising the following steps:
(1) chemical pulp of bleached hardwood is taken as a raw material, sent to a pulping machine for pulping and grinding, a pulp suspension is treated by using a disc mill, and a disc mill clearance treatment process with the size of 0.8-1.0mm is adopted in the swelling pretreatment stage, so that a swelling agent and fibers are fully mixed, and swelling is finished within 5-8 min; then gradually adjusting the disc mill clearance to 0.1-0.05mm, repeatedly pulping for 15-30min to complete microfibril separation, sending the microfibril suspension to a high-pressure homogenizer, circulating for 10-15 times under the condition of 40-60MPa, freeze-drying, and carrying out gradient temperature rise carbonization at 80, 120 and 250 ℃ under the Ar gas condition to obtain carbonized microfibrillated cellulose;
(2) condensing beta-naphthalene sulfonic acid sodium formaldehydeMixing polymer, chitosan, calcium silicate, silane coupling agent, polyvinylpyrrolidone, chromium lactate, carbonized microfibrillated fiber, rosin thermopolymer, and zirconia fiber, grinding into 600m specific surface area2More than kg.
Comparative example 1
The procedure of example 1 was followed except that carbonized microfibrillated fiber, rosin thermopolymer, and zirconia fiber were absent as raw materials for preparing the seawater-resistant reinforced concrete admixture.
Comparative example 2
The procedure was substantially the same as in example 1 except that carbonized microfibrillated fiber was absent in the raw materials for preparing the seawater-resistant reinforced concrete admixture.
Comparative example 3
Substantially the same procedure as in example 1 was conducted except that the raw materials for the seawater-resistant reinforced concrete admixture were deficient in the presence of the rosin-based thermopolymer.
Comparative example 4
The preparation process was substantially the same as that of example 1 except that the raw materials for preparing the seawater-resistant reinforced concrete admixture lacked the zirconia fiber.
Comparative example 5
The preparation process was substantially the same as that of example 1 except that chitosan was absent from the raw materials for preparing the seawater-resistant reinforced concrete admixture.
Comparative example 6
The preparation process was substantially the same as that of example 1 except that chromium lactate was absent from the raw materials for preparing the seawater-resistant reinforced concrete admixture.
The test of the flexural strength and the compressive strength was carried out by preparing a ready-mixed concrete in a mass mixing ratio of 160 parts by mass of water, 300 parts by mass of No. 425 cement, 80 parts by mass of fly ash, 700 parts by mass of sand, 1030 parts by mass of crushed stone, and 50 parts by mass of the admixture of the example and the comparative example.
The concrete corrosion resistance coefficient K refers to the corrosion degree of a concrete sample soaked in a sulfate solution with a certain concentration for a long time, and is specifically executed according to a sulfate corrosion resistance test method in the standard GB/T50082-2009 test method for long-term performance and durability of common concrete.
From the above table, it can be seen that: according to the invention, chitosan, carbonized microfibrillated fiber, rosin thermopolymer, chromium lactate and zirconia fiber with certain content are added to play a synergistic role in preparing the seawater-resistant reinforced concrete admixture, so that the flexural strength and compressive strength of the admixture on concrete and the erosion resistance coefficient K of the concrete are synergistically improved. When the weight ratio of the chitosan, the carbonized microfibrillated fiber, the rosin thermopolymer and the zirconia fiber is 4:2:1:1, namely, the embodiment 1 of the present invention, the technical effects of the present invention can be optimally achieved.
The above description should not be taken as limiting the invention to the embodiments, but rather, as will be apparent to those skilled in the art to which the invention pertains, numerous simplifications or substitutions may be made without departing from the spirit of the invention, which shall be deemed to fall within the scope of the invention as defined by the claims appended hereto.
Claims (5)
1. The seawater-resistant reinforced concrete admixture comprises the following raw materials in parts by mass: 70-80 parts of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5-10 parts of chitosan, 4-7 parts of calcium silicate, 2-8 parts of silane coupling agent, 1-2 parts of polyvinylpyrrolidone, 1-2 parts of chromium lactate, 3-5 parts of carbonized microfibrillated fiber, 1-3 parts of rosin thermopolymer and 1-3 parts of zirconia fiber; the carbonized microfibrillated fiber is a product obtained by carrying out high-temperature anaerobic carbonization on microfibrillated plant fiber.
2. The seawater-resistant reinforced concrete admixture according to claim 1, wherein the weight ratio of the chitosan, the carbonized microfibrillated fiber, the rosin thermopolymer and the zirconia fiber is 4:2:1: 1.
3. The seawater-resistant reinforced concrete admixture according to claim 1, wherein the zirconia fiber has an average diameter of 5 to 15 μm.
4. The seawater-resistant reinforced concrete admixture according to claim 1, wherein the average diameter of the carbonized microfibrillated fiber is 5 to 20 nm.
5. A method for preparing the seawater-resistant reinforced concrete admixture as claimed in any one of claims 1 to 4, comprising the steps of:
(1) chemical pulp of bleached hardwood is taken as a raw material, sent to a pulping machine for pulping and grinding, a pulp suspension is treated by using a disc mill, and a disc mill clearance treatment process with the size of 0.8-1.0mm is adopted in the swelling pretreatment stage, so that a swelling agent and fibers are fully mixed, and swelling is finished within 5-8 min; then gradually adjusting the disc mill clearance to 0.1-0.05mm, repeatedly pulping for 15-30min to complete microfibril separation, sending the microfibril suspension to a high-pressure homogenizer, circulating for 10-15 times under the condition of 40-60MPa, freeze-drying, and carrying out gradient temperature rise carbonization at 80, 120 and 250 ℃ under the Ar gas condition to obtain carbonized microfibrillated cellulose;
(2) mixing 70-80 parts by mass of beta-sodium naphthalene sulfonate formaldehyde polycondensate, 5-10 parts by mass of chitosan, 4-7 parts by mass of calcium silicate, 2-8 parts by mass of silane coupling agent, 1-2 parts by mass of polyvinylpyrrolidone, 1-2 parts by mass of chromium lactate, 3-5 parts by mass of carbonized microfibrillated fiber, 1-3 parts by mass of rosin thermopolymer and 1-3 parts by mass of zirconia fiber, uniformly mixing, inputting into a grinding machine, and grinding into powder with the specific surface area of 600m2More than kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242225.3A CN111333366B (en) | 2020-03-31 | 2020-03-31 | Seawater-resistant reinforced concrete admixture and preparation method thereof |
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