CN113354334A - Composite fiber anti-cracking agent - Google Patents
Composite fiber anti-cracking agent Download PDFInfo
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- CN113354334A CN113354334A CN202110643417.XA CN202110643417A CN113354334A CN 113354334 A CN113354334 A CN 113354334A CN 202110643417 A CN202110643417 A CN 202110643417A CN 113354334 A CN113354334 A CN 113354334A
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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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- 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
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a composite fiber anti-cracking agent, which belongs to the technical field of building material admixtures and comprises 8-30 wt% of an expanding agent, 20-40 wt% of microbeads, 25-45 wt% of coal gangue, 2-8 wt% of modified composite fibers, 0.5-1.0 wt% of a water reducing agent and 0.1-0.2 wt% of a defoaming agent. The modified composite fiber is prepared by melting mineral fiber and basalt fiber, spraying, treating with alkali liquor to obtain crude fiber product, closely adsorbing semi-molten polypropylene fiber on the surface of the crude fiber product, and modifying with silane coupling agent. The modified composite fiber prepared by the special method further improves the crack resistance and permeability resistance of the composite fiber crack resistance agent based on the prior art; the anti-cracking, anti-stretching and anti-permeability performances of the concrete are obviously improved by adding the anti-cracking, anti-stretching and anti-permeability agent into the concrete; and because the modified composite fiber is combined with other raw materials of concrete more tightly, the mechanical strength of the concrete cured by adopting the conventional curing mode is also enhanced in the early stage and the middle and later stages.
Description
Technical Field
The invention belongs to the technical field of building material additives, and particularly relates to a composite fiber anti-cracking agent.
Background
The concrete is a hydraulic cementing material, a cement concrete structure which is in a natural environment from the beginning of casting and forming, and in the whole process of hydration and hardening, self-shrinkage, drying shrinkage and temperature reduction shrinkage exist due to the hydration reaction of the concrete and the dehydration process to the surrounding environment medium, and the shrinkage under the constraint condition causes the cracking of the concrete, which is a main cause of engineering quality accidents. In the prior art, materials such as carbon fibers, organic fibers and basalt fibers are added into concrete, and the fibers are modified, so that the modified fibers are utilized to achieve a toughening effect, and volume expansion generated by an expanding agent component in a hydration process compensates for volume shrinkage of the concrete, so that the concrete material is effectively prevented from shrinkage cracking, particle size distribution is optimized, and the purposes of strongest bonding force between the modified fibers and a cement base material and optimized filling compactness are achieved.
For example, chinese patent application CN108911625A provides an impervious and anti-cracking concrete, which is prepared by adding conventional raw materials such as cement, medium sand, fly ash, mineral powder, etc., as well as an anti-permeability agent, a reinforcing agent and a silane coupling agent; the anti-permeability agent is active silicon micro powder, diatomite and kaolin, and is used for improving the crack resistance and the permeability resistance of the concrete; the reinforcing agent is selected from basalt fiber and carbon fiber and is used for improving the mechanical strength of the concrete.
For example, chinese patent application CN112408895A provides an anti-crack recycled concrete and a preparation method thereof, wherein the raw materials comprise anti-crack composite fibers, and the anti-crack composite fibers are prepared by ball-milling and mixing graphene, polypropylene resin and waste glass, adding maleic acid glycoside grafted polypropylene, a silane coupling agent and liquid paraffin, mixing, and finally melting, extruding and spinning. The composite fiber can improve the crack resistance of concrete. Silica fume is used as main filler to fill gaps among cement particles, so that the strength and durability of concrete are improved.
For another example, chinese patent application CN112028557A provides an anti-crack concrete and a method for preparing the same, wherein nano boron fibers, cellulose fibers, a polyethylene glycol aqueous solution and a silane coupling agent are added to the raw materials; the surface treatment is carried out on the cellulose fiber by using the polyethylene glycol aqueous solution and the silane coupling agent, under the synergistic action of the pre-modified cellulose fiber, the nano boron fiber and the nano ammonium bicarbonate, the hydration heat of cement is reduced, the shrinkage rate of the concrete in the later hardening process is reduced, the alkali resistance of the cellulose fiber is improved, the cellulose fiber can stably exist in the anti-crack concrete, the time for the crack of the anti-crack concrete to appear is prolonged, and the anti-crack performance of the anti-crack concrete is improved. The nano boron fiber has high cost and general tensile strength and crack resistance improving effect.
However, in order to improve the crack resistance and mechanical strength of concrete, the above prior art patents still have rising spaces with higher raw material cost and general improvement effect of crack resistance and impermeability.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a composite fiber anti-cracking agent, which is realized by the following technology.
The composite fiber anti-cracking agent comprises 8-30 wt% of an expanding agent, 20-40 wt% of microbeads, 25-45 wt% of coal gangue, 2-8 wt% of modified composite fibers, 0.5-1.0 wt% of a water reducing agent and 0.1-0.2 wt% of a defoaming agent;
the preparation method of the modified composite fiber comprises the following steps:
s1, taking mineral fibers, polypropylene fibers and basalt fibers according to the mass ratio of 1:1 (0.002-0.006) for later use;
s2, mixing the mineral fiber and the basalt fiber uniformly, heating to a molten state, and extruding and spinning to obtain a fiber crude product;
s3, adding the crude fiber product obtained in the step S2 into a sodium hydroxide solution for alkali treatment, and washing and drying the crude fiber product by using purified water after the alkali treatment is finished;
s4, under the inert gas atmosphere, taking the polypropylene fiber and the crude fiber product prepared in the step S3, stirring and heating to 140 ℃, keeping the constant temperature for 20-30min, and then cooling to room temperature at the cooling speed of 3-5 ℃/min to obtain the composite fiber; the whole process of the step S4 is continuously stirred at the rotating speed of 100-;
s5, adding the composite fiber prepared in the step S4 into a silane coupling agent or a silane coupling agent solution, soaking for 1-2 hours, washing with an ethanol solution and purified water in sequence, and drying to obtain the modified composite fiber.
The composite fiber anti-cracking agent provided by the invention adopts a special modified composite fiber besides the conventional commercially available expanding agents (such as magnesium oxide, calcium sulphoaluminate-calcium oxide expanding agents and the like), microbeads (commercially available full-spherical, continuous particle size distribution, superfine, solid and superfine fly ash aluminosilicate fine microbeads with the particle size of below 10 mu m generally), coal gangue (solid waste discharged in the coal mining process and the coal washing process), water reducing agents (maleic anhydride, maleic anhydride type polycarboxylic acid water reducing agents, naphthalene water reducing agents and the like) and defoaming agents (such as polyethers, organosilicones or polyether modified organosilicones). The modified composite fiber is prepared by taking mineral fibers (generally selected from asbestos fibers, sepiolite mineral fibers and fly ash mineral fibers), polypropylene fibers and basalt fibers as raw materials, stirring and melting the mineral fibers and the basalt fibers (generally heating to about 1550 ℃, and taking complete melting of the mineral fibers and the basalt fibers as a standard), and spinning to melt the two fibers into a composite crude fiber; then carrying out surface treatment on the crude fiber product by using alkali liquor such as sodium hydroxide and the like; the melting point of the polypropylene fiber is generally about 167 ℃, the melting point of the crude fiber is about 14000-1550 ℃, so that the crude fiber and the polypropylene fiber are heated to 140 ℃ together, the polypropylene fiber is in a semi-molten state and is closely attached to the surface of the crude fiber, and finally, the modified composite fiber with special structure and performance is formed by soaking and modifying with a silane coupling agent. Compared with the simple silane coupling agent treatment of mineral fibers, polypropylene fibers and basalt fibers, the modified composite fibers prepared by the special method have stronger stability and dispersibility in concrete slurry, better binding capacity with other raw materials of concrete, and obviously improved tensile property and mechanical property.
Preferably, the raw materials of the composite fiber anti-cracking agent comprise 18 wt% of an expanding agent, 35 wt% of microbeads, 40% of coal gangue, 6 wt% of modified composite fibers, 0.8 wt% of a water reducing agent and 0.2 wt% of a defoaming agent.
Preferably, in the preparation method of the modified composite fiber, the mass ratio of the mineral fiber, the polypropylene fiber and the basalt fiber in the step S1 is 1:1: 0.005.
Preferably, in the preparation method of the modified composite fiber, the concentration (mass fraction) of the sodium hydroxide solution used for the alkali treatment in the step S3 is 10-20%, and the soaking time is 30-50 min. Generally speaking, the concentration of the sodium hydroxide solution and the soaking time have a certain inverse relationship, i.e. the higher the concentration is, the shorter the soaking time can be relatively; the lower the concentration, the longer the soaking time can be. The concentration of the sodium hydroxide solution and the soaking time are controlled according to the parameters, so that the alkali treatment process and the final treatment effect can be more conveniently controlled, the surface state of the obtained crude fiber product is relatively better, and the subsequent steps are easier to perform.
Preferably, in the method for preparing the modified composite fiber, the maximum temperature of the temperature rise in the step S4 is 135 ℃, the constant temperature is maintained for 30min, and the stirring speed of the whole process of the temperature rise to the room temperature is 200 rpm.
Preferably, in the method for preparing the modified composite fiber, the silane coupling agent solution of step S5 is a solution with a mass fraction of 4-7% prepared by adding the silane coupling agent to an ethanol aqueous solution with a mass fraction of 60-70% and mixing.
Preferably, in the preparation method of the modified composite fiber, the mineral fiber is at least one of asbestos fiber, sepiolite mineral fiber and fly ash mineral fiber. Asbestos fiber, sepiolite mineral fiber and fly ash mineral fiber belong to commercially available mineral fiber products, and the melting point of the mineral fiber is generally about 1500 ℃ and is not greatly different from that of basalt fiber.
Preferably, the silane coupling agent is an alkyl silane coupling agent or an epoxy silane coupling agent;
the alkyl silane coupling agent is at least one of n-dodecyl trimethoxy silane, n-dodecyl triethoxy silane, cyclohexyl trimethoxy silane, isobutyl triethoxy silane, n-hexadecyl trimethoxy silane, n-hexyl triethoxy silane, n-octyl trimethoxy silane and n-octyl triethoxy silane;
the epoxy silane coupling agent is at least one of 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, and 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane.
Preferably, the modified composite fiber has a diameter of 10 to 16 micrometers and a length of 3 to 8 mm.
The composite fiber anti-cracking agent provided by the invention is prepared by uniformly stirring solid raw materials in all raw materials by adopting a conventional mixing mode, and then adding liquid raw materials to uniformly mix.
Compared with the prior art, the invention has the advantages that: the modified composite fiber prepared by the special method further improves the crack resistance and permeability resistance of the composite fiber crack resistance agent on the basis of the prior art; the anti-cracking, anti-stretching and anti-permeability performances of the concrete are obviously improved by adding the anti-cracking, anti-stretching and anti-permeability agent into the concrete; and because the modified composite fiber is combined with other raw materials of concrete more tightly, the mechanical strength of the concrete cured by adopting a conventional curing mode is also enhanced to a certain extent in the early stage and the middle and later stages.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 expanding agent adopted in the following examples and comparative examples is calcium sulphoaluminate expanding agent, the purchased micro-bead specific surface area is about 1000-1500 square meters per kg, the particle size of the coal gangue is about 1.5-3mm, the water reducing agent adopts high-efficiency polycarboxylic acid water reducing agent, and the defoaming agent adopts polyether modified organic silicon defoaming.
The following examples and comparative examples, if not specifically described, were prepared using the following methods:
s1, taking mineral fibers, polypropylene fibers and basalt fibers according to a specific mass ratio for later use;
s2, mixing the mineral fiber and the basalt fiber uniformly, heating to a molten state, and extruding and spinning to obtain a fiber crude product;
s3, adding the crude fiber product obtained in the step S2 into a 20% sodium hydroxide solution for alkali treatment for 30min, and washing and drying the crude fiber product with purified water after the alkali treatment is finished;
s4, under the inert gas atmosphere, taking the polypropylene fiber and the crude fiber product prepared in the step S3, stirring and heating to a specific temperature, keeping for a period of time, and then cooling to room temperature at the speed of 5 ℃/min to obtain the composite fiber; the whole process of step S4 is continuously stirred at a specific rotation speed;
s5, adding the composite fiber prepared in the step S4 into silane coupling agent n-dodecyl trimethoxy silane, soaking for 2 hours, washing with 20% ethanol solution and purified water in sequence, and drying to obtain the modified composite fiber.
The composite fiber crack resistance agent provided in the following examples and comparative examples is prepared by uniformly stirring solid raw materials in all raw materials, then adding liquid raw materials, and uniformly mixing.
Example 1
The raw materials of the composite fiber anti-cracking agent provided by the embodiment comprise 18 wt% of an expanding agent, 35 wt% of microbeads, 40 wt% of coal gangue, 6 wt% of modified composite fibers, 0.8 wt% of a water reducing agent and 0.2 wt% of a defoaming agent;
in the preparation method of the modified composite fiber, the mass ratio of the asbestos fiber (mineral fiber), the polypropylene fiber and the basalt fiber in the step S1 is 1:1: 0.005; the maximum temperature rise temperature of the step S4 is 135 ℃, the constant temperature time is 30min, and the stirring speed in the whole process is 200 rpm.
The final modified composite fiber was prepared to have a diameter of about 13 microns and a length of about 5 mm.
Example 2
The only difference between the composite fiber anti-cracking agent provided by the embodiment and the embodiment 1 is that the raw materials comprise 30 wt% of an expanding agent, 40 wt% of microbeads, 25% of coal gangue, 4 wt% of modified composite fibers, 0.8 wt% of a water reducing agent and 0.2 wt% of a defoaming agent; in the preparation method of the modified composite fiber, the mineral fiber of the step S1 is sepiolite mineral fiber.
The diameter and length of the finally prepared modified composite fiber were substantially the same as those of example 1.
Example 3
The only difference between the composite fiber anti-cracking agent provided by the embodiment and the embodiment 1 is that the raw materials comprise 8 wt% of an expanding agent, 40 wt% of microbeads, 45 wt% of coal gangue, 6 wt% of modified composite fibers, 0.8 wt% of a water reducing agent and 0.2 wt% of a defoaming agent;
in the preparation method of the modified composite fiber, the mineral fiber of the step S1 is a fly ash mineral.
The diameter and length of the finally prepared modified composite fiber were substantially the same as those of example 1.
Example 4
The only difference between the composite fiber anti-cracking agent provided by the embodiment and the embodiment 1 is that the raw materials comprise 30 wt% of an expanding agent, 20 wt% of microbeads, 45 wt% of coal gangue, 4 wt% of modified composite fibers, 0.8 wt% of a water reducing agent and 0.2 wt% of a defoaming agent.
The diameter and length of the finally prepared modified composite fiber were substantially the same as those of example 1.
Example 5
The only difference between the composite fiber anti-cracking agent provided in this embodiment and embodiment 1 is that, in the preparation method of the modified composite fiber, the mineral fiber in step S1 is sepiolite mineral fiber, and the weight ratio of the mineral fiber, the polypropylene fiber and the basalt fiber is 1:1: 0.006.
The final modified composite fiber is about 13-15 microns in diameter and about 3-4mm in length.
Example 6
The only difference between the composite fiber anti-cracking agent provided in this embodiment and embodiment 1 is that, in the preparation method of the modified composite fiber, the mineral fiber in step S1 is a fly ash mineral fiber, and the weight ratio of the mineral fiber, the polypropylene fiber and the basalt fiber is 1:1: 0.002.
The final modified composite fiber has a diameter of about 10-11 microns and a length of about 7-8 mm.
Example 7
The only difference between the composite fiber anti-cracking agent provided by the embodiment and the embodiment 1 is that in the preparation method of the modified composite fiber, the maximum temperature rise in the step S4 is 110 ℃, the constant temperature time is 30min, and the stirring speed in the whole process is 100 rpm.
The diameter and length of the finally prepared modified composite fiber were substantially the same as those of example 1.
Example 8
The only difference between the composite fiber anti-cracking agent provided by the embodiment and the embodiment 1 is that in the preparation method of the modified composite fiber, the maximum temperature rise temperature of the step S4 is 140 ℃, the constant temperature time is 20min, and the stirring speed in the whole process is 250 rpm.
The final modified composite fiber has a diameter of about 14-16 microns and a length of about 7-8 mm.
Comparative example 1
The composite fiber anti-cracking agent provided by the comparative example is only different from the composite fiber anti-cracking agent provided by the example 1 in that the preparation method of the modified composite fiber is as follows:
s1, taking mineral fibers, polypropylene fibers and basalt fibers according to the mass ratio of 1:1:0.005 for later use;
s2, adding mineral fibers and basalt fibers into a 20% sodium hydroxide solution for alkali treatment for 30min, and washing and drying with purified water after the alkali treatment is finished;
s3, under the inert gas atmosphere, stirring the polypropylene fiber obtained in the step S1 and the two fibers obtained in the step S2 together, heating to 135 ℃, keeping the temperature constant for 30min, and cooling to room temperature at a cooling speed of 5 ℃/min to obtain a composite fiber; the whole process of heating to room temperature and cooling to room temperature is continuously stirred at the rotating speed of 200 rpm;
s4, adding the composite fiber prepared in the step S3 into a silane coupling agent, soaking for 2 hours, washing with 20% ethanol solution and purified water in sequence by mass fraction, and drying to obtain the modified composite fiber.
The finally prepared modified composite fiber is a mixture of mineral fiber attached with polypropylene fiber and basalt fiber attached with polypropylene fiber, the diameter is about 10-16 microns, and the length is about 3-8 mm.
Comparative example 2
The composite fiber anti-cracking agent provided by the comparative example is only different from the composite fiber anti-cracking agent provided by the example 1 in that the preparation method of the modified composite fiber is as follows:
s1, taking mineral fibers, polypropylene fibers and basalt fibers according to the mass ratio of 1:1:0.005 for later use;
s2, mixing the mineral fiber and the basalt fiber uniformly, heating to a molten state, and extruding and spinning to obtain a fiber crude product;
s3, adding the crude fiber product obtained in the step S2 into a 20% sodium hydroxide solution for alkali treatment for 30min, and washing and drying the crude fiber product with purified water after the alkali treatment is finished;
s4, adding the polypropylene fiber and the crude fiber prepared in the step S3 into silane coupling agent n-dodecyl trimethoxy silane for soaking for 2 hours, washing with 20% ethanol solution and purified water in sequence by mass fraction, and drying to obtain the modified composite fiber.
The modified composite fiber prepared finally is the mixture of modified polypropylene fiber and crude modified fiber, and has diameter of 12-15 micron and length of 5-8 mm.
Comparative example 3
The composite fiber anti-cracking agent provided by the comparative example is only different from the composite fiber anti-cracking agent provided by the example 1 in that the preparation method of the modified composite fiber is as follows:
s1, taking mineral fibers, polypropylene fibers and basalt fibers according to the mass ratio of 1:1:0.005,
s2, mixing the mineral fiber and the basalt fiber uniformly, heating to a molten state, and extruding and spinning to obtain a fiber crude product;
s3, adding the crude fiber into 20% sodium hydroxide solution for alkali treatment for 30min, and washing and drying with purified water after the treatment is finished;
s4, adding the polypropylene fiber, the mineral fiber after alkali treatment and the basalt fiber into silane coupling agent n-dodecyl trimethoxy silane for soaking for 2 hours, washing with 20% ethanol solution and purified water in sequence by mass fraction, and drying to obtain the modified composite fiber.
The diameter and length of the finally prepared modified composite fiber were substantially the same as those of example 1.
Comparative example 4
The composite fiber anti-cracking agent provided by the comparative example is only different from the composite fiber anti-cracking agent provided by the example 1 in that the preparation method of the modified composite fiber is as follows:
s1, taking mineral fibers, polypropylene fibers and basalt fibers according to the mass ratio of 1:1:0.005 for later use;
s2, mixing the mineral fiber and the basalt fiber uniformly, heating to a molten state, and extruding and spinning to obtain a fiber crude product;
s3, under the inert gas atmosphere, stirring the polypropylene fiber obtained in the step S1 and the crude fiber obtained in the step S2, heating to 135 ℃, keeping the temperature constant for 30min, and cooling to room temperature at a cooling speed of 5 ℃/min to obtain composite fiber; the whole process of heating to room temperature and cooling to room temperature is continuously stirred at the rotating speed of 200 rpm;
s4, adding the composite fiber prepared in the step S3 into a silane coupling agent, soaking for 2 hours, washing with 20% ethanol solution and purified water in sequence by mass fraction, and drying to obtain the modified composite fiber.
The diameter and length of the finally prepared modified composite fiber were substantially the same as those of example 1.
Application example 1: crack resistance and permeability resistance test of composite fiber crack resistance agent
1. Basic concrete test piece and test object:
the preparation method of the foundation concrete test piece comprises the following steps: a concrete pump station engineering C25 concrete is used as a basic concrete test piece, P.O 32.5 cement is used as a raw material, fly ash is I-grade ash, and fine aggregate is fineness modulus of 2.60g/cm3The coarse aggregate of the river sand is broken stone, and the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent; in addition, the composite fiber crack resistance agent prepared by the method of the embodiment and the comparative example is also added. The concrete mixing proportion is as follows: 150 parts of water, 305 parts of cement, 50 parts of fly ash, 705 parts of river sand and 1250 parts of broken stone; in addition, a water reducing agent and a composite fiber anti-cracking agent are added, wherein the adding amount of the water reducing agent is 2% of the total amount of the cementing material, and the adding amount of the composite fiber anti-cracking agent is 8% of the total amount of the cementing material. And manufacturing and curing the concrete sample according to the requirements in GB/T50081-2016 Standard test method for mechanical Properties of ordinary concrete. In addition, a concrete blank without any composite fiber anti-cracking agent incorporated therein was set as a control.
2. The test method comprises the following steps:
(1) resistance to chloride ion permeation: testing the chloride ion penetration depth of the standard test block according to a rapid chloride ion migration coefficient method in GB/T50082-2009 test method standard for long-term performance and durability of common concrete;
(2) water penetration resistance: testing the water seepage depth of the standard test block according to a step-by-step pressurization method in GB/T50082-2009 'test method standard for long-term performance and durability of common concrete';
(4) compressive strength, compressive strength: manufacturing a standard test block according to GB/T50081-2016 (Standard for testing mechanical properties of common concrete), and measuring the compressive strength and the flexural strength of the standard test block maintained for 1d, 7d and 28 d;
(5) early crack resistance: and (3) making a standard test block according to GB/T50081-2016 (Standard test method for mechanical properties of common concrete), and measuring after concrete pouring for 24 hours to obtain the number of cracks in a unit area and the total crack area in the unit area.
The results of the performance test of the composite fiber crack resistance agents of the above examples and comparative examples are shown in table 1 below.
TABLE 1 Performance test results of composite fiber crack resistance agent
As can be seen from table 1 above, only by selecting 3 types of fibers of the present invention, the mineral fibers and basalt fibers are melt-spun into crude fiber products, and treated with alkali, then the polypropylene fibers in a semi-molten state are attached to the crude fiber products, and finally the silane coupling agent is modified to prepare modified composite fibers, the anti-cracking and anti-permeability effects of the concrete can be improved more significantly. When the mineral fibers and the basalt fibers are not melted to prepare crude fiber products, or the crude fiber products are not subjected to alkali treatment, or the polypropylene fibers are not attached to the mineral fibers and the basalt fibers, or the crude fiber products and the polypropylene fibers are directly modified by using the silane coupling agent, the improvement degree of the crack resistance and the permeability resistance of the concrete is limited.
Claims (9)
1. The composite fiber anti-cracking agent is characterized in that raw materials comprise 8-30 wt% of an expanding agent, 20-40 wt% of microbeads, 25-45 wt% of coal gangue, 2-8 wt% of modified composite fibers, 0.5-1.0 wt% of a water reducing agent and 0.1-0.2 wt% of a defoaming agent;
the preparation method of the modified composite fiber comprises the following steps:
s1, taking mineral fibers, polypropylene fibers and basalt fibers according to the mass ratio of 1:1 (0.002-0.006) for later use;
s2, mixing the mineral fiber and the basalt fiber uniformly, heating to a molten state, and extruding and spinning to obtain a fiber crude product;
s3, adding the crude fiber product obtained in the step S2 into a sodium hydroxide solution for alkali treatment, and washing and drying the crude fiber product by using purified water after the alkali treatment is finished;
s4, under the inert gas atmosphere, taking the polypropylene fiber and the crude fiber product prepared in the step S3, stirring and heating to 140 ℃, keeping the constant temperature for 20-30min, and then cooling to room temperature at the cooling speed of 3-5 ℃/min to obtain the composite fiber; the whole process of the step S4 is continuously stirred at the rotating speed of 100-;
s5, adding the composite fiber prepared in the step S4 into a silane coupling agent or a silane coupling agent solution, soaking for 1-2 hours, washing with an ethanol solution and purified water in sequence, and drying to obtain the modified composite fiber.
2. The composite fiber anti-cracking agent according to claim 1, wherein the raw materials comprise 18 wt% of an expanding agent, 35 wt% of microbeads, 40% of coal gangue, 6 wt% of modified composite fibers, 0.8 wt% of a water reducing agent and 0.2 wt% of a defoaming agent.
3. The composite fiber anti-cracking agent according to claim 1, wherein in the preparation method of the modified composite fiber, the mass ratio of the mineral fiber, the polypropylene fiber and the basalt fiber in step S1 is 1:1: 0.005.
4. The composite fiber anti-crack agent according to claim 1, wherein in the preparation method of the modified composite fiber, the concentration of the sodium hydroxide solution used in the alkali treatment of step S3 is 10-20%, and the soaking time is 30-50 min.
5. The conjugate fiber anti-crack agent according to claim 1, wherein in the preparation method of the modified conjugate fiber, the maximum temperature of the temperature rise in step S4 is 135 ℃, the constant temperature is maintained for 30min, and the stirring speed of the whole process of the temperature rise to the room temperature is 200 rpm.
6. The composite fiber crack resistance agent according to claim 1, wherein in the preparation method of the modified composite fiber, the silane coupling agent solution of step S5 is a solution prepared by adding and mixing a silane coupling agent to an ethanol aqueous solution with a mass fraction of 60-70% to obtain a mass fraction of 4-7%.
7. The composite fiber crack resistance agent according to claim 1, wherein in the preparation method of the modified composite fiber, the mineral fiber is at least one of asbestos fiber, sepiolite mineral fiber and fly ash mineral fiber.
8. The composite fiber crack resistance agent according to claim 1, wherein the silane coupling agent is an alkyl silane coupling agent or an epoxy silane coupling agent;
the alkyl silane coupling agent is at least one of n-dodecyl trimethoxy silane, n-dodecyl triethoxy silane, cyclohexyl trimethoxy silane, isobutyl triethoxy silane, n-hexadecyl trimethoxy silane, n-hexyl triethoxy silane, n-octyl trimethoxy silane and n-octyl triethoxy silane;
the epoxy silane coupling agent is at least one of 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, and 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane.
9. The composite fiber crack resistance agent as claimed in claim 1, wherein the modified composite fiber has a diameter of 10-16 μm and a length of 3-8 mm.
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| CN202110643417.XA CN113354334B (en) | 2021-06-09 | 2021-06-09 | Composite fiber anti-cracking agent |
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| CN202110643417.XA CN113354334B (en) | 2021-06-09 | 2021-06-09 | Composite fiber anti-cracking agent |
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| CN113354334A true CN113354334A (en) | 2021-09-07 |
| CN113354334B CN113354334B (en) | 2023-03-28 |
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