CN113045267B - Low-shrinkage waterproof concrete for underground engineering and preparation process thereof - Google Patents
Low-shrinkage waterproof concrete for underground engineering and preparation process thereof Download PDFInfo
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- CN113045267B CN113045267B CN202110194165.7A CN202110194165A CN113045267B CN 113045267 B CN113045267 B CN 113045267B CN 202110194165 A CN202110194165 A CN 202110194165A CN 113045267 B CN113045267 B CN 113045267B
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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
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
- C03C25/28—Macromolecular compounds or prepolymers obtained by reactions involving only carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/40—Organo-silicon compounds
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/465—Coatings containing composite materials
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/48—Coating with two or more coatings having different compositions
- C03C25/50—Coatings containing organic materials only
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/42—Glass
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/022—Agglomerated materials, e.g. artificial aggregates agglomerated by an organic binder
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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
- 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
- C04B2111/23—Acid resistance, e.g. against acid air or rain
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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
- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a low-shrinkage waterproof concrete for underground engineering and a preparation process thereof, wherein the concrete comprises the following components in parts by weight: 400 portions of cementing material, 1300 portions of coarse aggregate, 1600 portions of fine aggregate, 950 portions of fine aggregate, 30 to 70 portions of composite fiber material, 4.8 to 6.5 portions of additive and 190 portions of mixing water; wherein the gelled material is a mixture of an organic gelled material and an inorganic gelled material with a mass ratio of 1:4.5-6.5, and the composite fiber material comprises the following components in a mass ratio of 1: 0-0.5 of polypropylene-glass fiber composite material and polypropylene-wood pulp fiber composite material, the concrete prepared by reasonable raw material selection and modification treatment has excellent waterproofness and low shrinkage rate, the overall compressive strength and the impermeability grade are obviously improved, and the concrete is efficient and practical, is particularly applicable to underground engineering construction and is worthy of application and popularization.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to low-shrinkage waterproof concrete for underground engineering and a preparation process thereof.
Background
The underground engineering is underground civil engineering built for developing and utilizing underground space resources, and includes underground house, underground structure, underground railway, highway tunnel, underwater tunnel, underground common ditch, street-crossing underground passage, etc. With the development of times, the universality of underground engineering becomes more and more important, and the quality of concrete is more important in the engineering design and construction process.
Concrete is a material which is necessary to be used in the existing building construction, but the technical requirements of different parts and different structures of a building on the concrete are different. At present, due to the influences of different construction periods, waterproof grades, large sections, large volumes and construction processes in the construction of underground structures, harmful concrete cracks are easily generated in buildings due to the influences of temperature, shrinkage, concrete materials, mixing proportion and the like in the construction stage.
The waterproof function of concrete for underground building engineering is mainly that the concrete achieves the waterproof effect by means of the hydrophobicity and the compactness of the concrete, wherein the improvement of the impermeability of the concrete is the improvement of the compactness of the concrete, and the inhibition of pores is mainly that the quality and the quantity of mortar in the concrete are ensured by controlling the water cement ratio, the cement amount and the sand content in the construction so as to inhibit the pores, so that the concrete is soaked in water for a certain depth without water seepage, or an expanding agent and a high-efficiency water reducing agent are added in the construction, so that the shrinkage of the concrete is reduced, and the crack resistance of the concrete is enhanced.
Disclosure of Invention
In view of the above, the invention aims to provide a low-shrinkage waterproof concrete for underground engineering and a preparation process thereof, wherein the prepared concrete has excellent waterproofness and low shrinkage rate through reasonable raw material selection and modification treatment, the overall compressive strength and the impermeability grade are obviously improved, and the concrete is efficient and practical, and is particularly worthy of application and popularization for underground engineering construction.
In order to achieve the purpose, the invention provides the following technical scheme:
the low-shrinkage waterproof concrete for underground engineering comprises the following components in parts by weight: 400 portions of cementing material, 1300 portions of coarse aggregate, 1600 portions of fine aggregate, 950 portions of fine aggregate, 30 to 70 portions of composite fiber material, 4.8 to 6.5 portions of additive and 190 portions of mixing water; wherein the gelled material is a mixture of an organic gelled material and an inorganic gelled material with a mass ratio of 1:4.5-6.5, and the composite fiber material comprises the following components in a mass ratio of 1: 0-0.5 polypropylene-glass fiber composite material and polypropylene-wood pulp fiber composite material
As further preferred in the invention, the organic cementing material is LDPE-g-MAH/EGDE; the inorganic cementing material is P.C42.5.
The preparation method is further preferable, and the polypropylene-glass fiber composite material in the composite fiber material is prepared by the steps of dipping glass fibers in a polyvinyl alcohol aqueous solution, carrying out ultrasonic treatment for 10-15min, then adding a silane coupling agent, carrying out heat preservation and stirring at 70-80 ℃ for 20-40min, filtering, washing and drying to obtain modified glass fibers; taking glycidyl methacrylate as a monomer and dicumyl peroxide as an initiator, carrying out melt grafting on the glycidyl methacrylate and polypropylene to obtain a PP-g-GMA copolymer, and then carrying out melt impregnation coating process on the PP-g-GMA copolymer and modified glass fiber to prepare the fiber reinforced polypropylene composite material.
As a further optimization of the invention, the length-diameter ratio of the glass fiber is 30-45, the ultrasonic treatment is specifically 45-48KHz, and the power is 300W.
The preparation method is further preferable, and the polypropylene-wood pulp fiber composite material in the composite fiber material is prepared by the steps of taking epoxy resin and wood pulp fiber to blend according to the mass ratio of 1:2, stirring and uniformly mixing, adding sponge iron accounting for 20-30wt% of the mass of the wood pulp fiber, carrying out ultrasonic treatment for 5-20min, adding polypropylene accounting for 2-5 times of the mass of the wood pulp fiber and a proper amount of additive, carrying out shaking mixing for 10-60min at the temperature of 175-185 ℃ under 8-12KHz, and finally extruding granules.
As further optimization of the invention, the particle size of the sponge iron is 0.5-2mm, the ultrasonic treatment is specifically 35-45KHz, the power is 400W, and the additives comprise an antioxidant, a curing agent and a dispersing agent.
As further optimization of the invention, the particle size of the fine aggregate is 0-5mm, wherein the mass percentage of the fine material with the particle size of 1-3.5mm accounts for 55-70 wt%; the grain diameter of the coarse aggregate is 5-20mm, wherein the mass percentage of the coarse material with the diameter of 8-12mm accounts for 60-80 wt%.
As a further preferred mode of the invention, the fine aggregate is selected from river sand and any one or a combination of more of talcum powder, diatomite and vermiculite powder, and the content of the river sand is not less than 80 wt%; the coarse aggregate is selected from the composition of crushed stone and sponge iron, and the mass percentage of the crushed stone and the sponge iron is 75-88wt% and 12-25wt% respectively
In a further preferred embodiment of the present invention, the additive is a polycarboxylic acid high efficiency water reducing agent, and the water reducing rate is not less than 23.5%.
Further preferably, the preparation process of the low shrinkage waterproof concrete for underground engineering comprises the following steps:
1) taking materials according to parts by weight, blending coarse aggregate and fine aggregate to obtain composite aggregate, blending 1/3 composite aggregate and a composite fiber material to obtain a first mixed material, and blending 2/3 composite aggregate and a cementing material to obtain a second mixed material;
2) adding the mixing water into the second mixed material, uniformly stirring, adding the additive during stirring, finally adding the first mixed material under the stirring condition, and keeping stirring for 60-150s to obtain the water-based ink.
The invention has the beneficial effects that: through reasonable raw material selection and modification treatment, the prepared concrete has excellent waterproofness and low shrinkage rate, the overall compressive strength and the impermeability grade are obviously improved, and the concrete is efficient and practical, is particularly suitable for underground engineering construction and is worthy of application and popularization.
Compared with common portland cement, the inorganic cementing material and the organic cementing material are matched and blended, the organic cementing material has excellent coordination reaction besides the synergistic effect of improving the gluing effect, and is in reaction bonding connection with other components, particularly composite fiber materials, so that a more stable structure is formed, an excellent connecting net micro framework is provided for concrete curing and forming, the mechanical property is remarkably improved, the shrinkage rate is reduced by at least 40%, meanwhile, the compatibility with organic polymers can be improved, the rheological promotion effect is good, the acid corrosion resistance of concrete is remarkably improved, the problem of internal permeation cracks is effectively reduced, and the effective service life is prolonged by more than 2 times.
And a reinforcing material-composite fiber material is arranged, so that the fiber material is favorable for enhancing the mechanical property of concrete, and the composite fiber material is modified and blended with polypropylene to form a modified fiber-polymer composite material which can be rapidly and effectively dispersed in a structure in the process of mixing with the concrete and form a connection net which is interlaced and wound with a cementing material and aggregate with a high specific surface, thereby further forming a stable structure, improving the compactness and enhancing the performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
the low-shrinkage waterproof concrete for underground engineering comprises the following components in parts by weight: 400 portions of cementing material, 1300 portions of coarse aggregate, 1600 portions of fine aggregate, 950 portions of fine aggregate, 30 to 70 portions of composite fiber material, 4.8 to 6.5 portions of additive and 190 portions of mixing water.
Wherein the grain diameter of the fine aggregate is 0-5mm, and the mass percentage of the fine material with the grain diameter of 1-3.5mm accounts for 55-70 wt%; the grain diameter of the coarse aggregate is 5-20mm, wherein the mass percentage of the coarse material with the diameter of 8-12mm accounts for 60-80 wt%.
Further, the fine aggregate is selected from river sand and any one or a combination of more of talcum powder, diatomite and vermiculite powder, and the content of the river sand is not lower than 80 wt%; the coarse aggregate is selected from the composition of crushed stone and sponge iron, and the mass percentage of the crushed stone and the sponge iron is 75-88wt% and 12-25wt% respectively
The additive is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is not lower than 23.5%.
The preparation process of the concrete comprises the following steps:
1) taking materials according to parts by weight, blending coarse aggregate and fine aggregate to obtain composite aggregate, blending 1/3 composite aggregate and a composite fiber material to obtain a first mixed material, and blending 2/3 composite aggregate and a cementing material to obtain a second mixed material;
2) adding the mixing water into the second mixed material, uniformly stirring, adding the additive during stirring, finally adding the first mixed material under the stirring condition, and keeping stirring for 60-150s to obtain the water-based ink.
Example 2:
the concrete component preparation and preparation process is provided based on the embodiment, wherein the cementing material is a mixture of an organic cementing material and an inorganic cementing material in a mass ratio of 1:4.5-6.5, and the composite fiber material comprises the following components in a mass ratio of 1: 0-0.5 of polypropylene-glass fiber composite material and polypropylene-wood pulp fiber composite material.
Furthermore, the organic cementing material is LDPE-g-MAH/EGDE; the inorganic cementing material is P.C42.5. Specifically, the inorganic cementing material P.C42.5 is purchased from the market, the organic cementing material is made from LDPE-g-MAH/EGDE, a proper amount of LDPE-g-MAH, a compatilizer and water are mixed, the mixture is heated and stirred until the LDPE-g-MAH (low density polyethylene grafted maleic anhydride) is completely dissolved, then a proper amount of EGDE (diethanol glycidyl ether) and a catalyst are added, the mixture is heated and reacted, and a product is filtered and purified to obtain the low density polyethylene (the low density polyethylene synthesis process with epoxy end groups at branched chains in the prior literature can be used for reference).
The preparation method of the polypropylene-glass fiber composite material in the composite fiber material comprises the steps of soaking glass fibers in a polyvinyl alcohol aqueous solution, carrying out ultrasonic treatment on the selected glass fibers with the length-diameter ratio of 30-45 for 10-15min, specifically 45-48KHz and the power of 300W, then adding a silane coupling agent into the glass fibers, carrying out heat preservation and stirring at 70-80 ℃ for 20-40min, filtering, washing and drying to obtain modified glass fibers; taking glycidyl methacrylate as a monomer and dicumyl peroxide as an initiator, carrying out melt grafting on the glycidyl methacrylate and polypropylene to obtain a PP-g-GMA copolymer, and then carrying out melt impregnation coating process on the PP-g-GMA copolymer and modified glass fiber to prepare the fiber reinforced polypropylene composite material.
The preparation method of the polypropylene-wood pulp fiber composite material in the composite fiber material comprises the steps of taking epoxy resin and wood pulp fiber to be mixed according to the mass ratio of 1:2, stirring and uniformly mixing, adding sponge iron with the particle size of 0.5-2mm, the mass of the sponge iron being 20-30wt% of that of the wood pulp fiber, carrying out ultrasonic treatment for 5-20min, specifically 35-45KHz and power of 400W, then adding polypropylene with the mass being 2-5 times of that of the wood pulp fiber and a proper amount of additives (including an antioxidant, a curing agent and a dispersing agent), carrying out oscillation mixing for 10-60min at 8-12KHz at the temperature of 185 ℃, and finally extruding granules.
Example 3:
based on the raw material selection, design and concrete preparation process given in examples 1 and 2, a specific embodiment is given here:
the low-shrinkage waterproof concrete for underground engineering comprises the following components in parts by weight: 420 parts of cementing material, 1450 parts of coarse aggregate, 1000 parts of fine aggregate, 48 parts of composite fiber material, 5.2 parts of additive and 174 parts of mixing water.
The cementing material is a mixture of an organic cementing material and an inorganic cementing material in a mass ratio of 1:5, and the composite fiber material comprises the following components in a mass ratio of 1: 0.3 of polypropylene-glass fiber composite material and polypropylene-wood pulp fiber composite material.
And, the inorganic cement material p.c42.5 was purchased from commercial sources, organic cement materials LDPE-g-MAH/EGDE, polypropylene-glass fiber composite, polypropylene-wood pulp fiber composite (homemade as in example 2).
The grain size of the fine aggregate is 0-5mm, wherein the mass percentage of the fine material with the grain size of 1-3.5mm accounts for 55-70wt%, and the fine material is selected from the composition of river sand and talcum powder, and the river sand accounts for 84.7 wt%; the particle size of the coarse aggregate is 5-20mm, wherein the mass percentage of the coarse material of 8-12mm accounts for 60-80wt%, and the composition is selected from the group consisting of crushed stone and sponge iron, and the mass percentage of the crushed stone and the sponge iron is 82 wt% and 18 wt%, respectively.
The additive is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is 24.1%.
The concrete preparation process was the same as in example 2.
Example 3:
based on the raw material selection, design and concrete preparation process given in examples 1 and 2, a specific embodiment is given here:
the low-shrinkage waterproof concrete for underground engineering comprises the following components in parts by weight: 450 parts of cementing material, 1520 parts of coarse aggregate, 1045 parts of fine aggregate, 71 parts of composite fiber material, 5.8 parts of additive and 180 parts of mixing water.
The cementing material is a mixture of an organic cementing material and an inorganic cementing material in a mass ratio of 1:6.2, and the composite fiber material comprises the following components in a mass ratio of 1: 0.5 of polypropylene-glass fiber composite material and polypropylene-wood pulp fiber composite material.
And, the inorganic cement material p.c42.5 was purchased from commercial sources, organic cement materials LDPE-g-MAH/EGDE, polypropylene-glass fiber composite, polypropylene-wood pulp fiber composite (homemade as in example 2).
The grain size of the fine aggregate is 0-5mm, wherein the mass percentage of the fine material with the grain size of 1-3.5mm accounts for 55-70wt%, and the fine material is selected from the composition of river sand and talcum powder, and the river sand accounts for 82.6 wt%; the particle size of the coarse aggregate is 5-20mm, wherein the mass percentage of the coarse material with the particle size of 8-12mm accounts for 60-80wt%, and the composition selected from the broken stone and the sponge iron respectively accounts for 79.5 wt% and 20.5 wt%.
The additive is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is 23.7%.
The concrete preparation process was the same as in example 2.
Example 3:
based on the raw material selection, design and concrete preparation process given in examples 1 and 2, a specific embodiment is given here:
the low-shrinkage waterproof concrete for underground engineering comprises the following components in parts by weight: 410 parts of cementing material, 1380 parts of coarse aggregate, 1070 parts of fine aggregate, 65 parts of composite fiber material, 5.7 parts of additive and 188 parts of mixing water.
The cementing material is a mixture of an organic cementing material and an inorganic cementing material in a mass ratio of 1:5.5, and the composite fiber material is a polypropylene-glass fiber composite material.
And, the inorganic gel material P.C42.5 is purchased from the market, the organic gel material LDPE-g-MAH/EGDE, polypropylene-glass fiber composite (self made according to example 2).
The grain size of the fine aggregate is 0-5mm, wherein the mass percentage of the fine material with the grain size of 1-3.5mm accounts for 55-70wt%, and the fine material is selected from the composition of river sand and talcum powder, and the river sand accounts for 81.5 wt%; the particle size of the coarse aggregate is 5-20mm, wherein the mass percentage of 8-12mm coarse material accounts for 60-80wt%, and the mass percentage of the coarse material is 85.6 wt% and 14.4 wt% respectively.
The additive is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is 24.4%.
The concrete preparation process was the same as in example 2.
Comparative examples 1-3 were prepared based on examples 3-5, with corresponding removal of the composite fiber material and other conditions unchanged.
Comparative examples 4-6 were prepared based on examples 3-5, with corresponding removal of organic cement (filled with inorganic cement) and other conditions unchanged.
Blank examples 1-3 were prepared based on examples 3-5, with composite fiber material removed and organic gelling material removed (filled with inorganic gelling material) at the same time, and other conditions were unchanged.
The concrete products prepared in the examples 3-5, the comparative examples 6-11 and the blank examples 1-3 of the invention are subjected to performance detection, and the data are as follows:
according to the table data, the reasonably designed compound organic and inorganic mixed cementing material and composite fiber material of the concrete have remarkable improvement on the comprehensive performance of the concrete, greatly improve the application quality, have high comprehensive benefit ratio and are worthy of popularization and application.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a low shrink waterproof concrete for underground works which characterized in that: the paint comprises the following components in parts by weight: 400-450 parts of cementing material, 1300 parts of coarse aggregate, 1600 parts of fine aggregate, 950-1100 parts of fine aggregate, 30-70 parts of composite fiber material, 4.8-6.5 parts of polycarboxylic acid high-efficiency water reducing agent and 190 parts of blending water; wherein the gelled material is a mixture of an organic gelled material and an inorganic gelled material with a mass ratio of 1:4.5-6.5, and the composite fiber material comprises the following components in a mass ratio of 1: 0-0.5 of polypropylene-glass fiber composite material and polypropylene-wood pulp fiber composite material;
the preparation method of the polypropylene-wood pulp fiber composite material in the composite fiber material comprises the steps of taking epoxy resin and wood pulp fiber to be blended according to the mass ratio of 1:2, stirring and uniformly mixing, adding sponge iron accounting for 20-30wt% of the mass of the wood pulp fiber, carrying out ultrasonic treatment for 5-20min, wherein the ultrasonic treatment is 35-45KHz with the power of 400W, then adding polypropylene accounting for 2-5 times of the mass of the wood pulp fiber and a proper amount of antioxidant, curing agent and dispersing agent, carrying out oscillation mixing for 10-60min at the temperature of 175-185 ℃ at 8-12KHz, and finally extruding granules to obtain the polypropylene-wood pulp fiber composite material;
the organic cementing material is low-density polyethylene grafted maleic anhydride/diethanol glycidyl ether; the inorganic cementing material is P.C42.5 cement;
the preparation method of the polypropylene-glass fiber composite material in the composite fiber material comprises the steps of dipping glass fibers in a polyvinyl alcohol aqueous solution, carrying out ultrasonic treatment for 10-15min, wherein the ultrasonic treatment is 45-48KHz and the power is 300W, then adding a silane coupling agent, carrying out heat preservation and stirring at 70-80 ℃ for 20-40min, filtering, washing and drying to obtain modified glass fibers; taking glycidyl methacrylate as a monomer and dicumyl peroxide as an initiator, carrying out melt grafting on the glycidyl methacrylate and polypropylene to obtain a PP-g-GMA copolymer, and then carrying out melt impregnation coating process on the PP-g-GMA copolymer and modified glass fibers to prepare a glass fiber reinforced polypropylene composite material;
the fine aggregate is selected from river sand and any one or more of talcum powder, diatomite and vermiculite powder, and the content of the river sand is not lower than 80 wt%; the coarse aggregate is selected from the composition of crushed stone and sponge iron, and the mass percentage of the crushed stone and the sponge iron is 75-88wt% and 12-25wt% respectively.
2. The low shrinkage waterproof concrete for underground works according to claim 1, wherein: the length-diameter ratio of the glass fiber is 30-45.
3. The low shrinkage waterproof concrete for underground works according to claim 1, wherein: the particle size of the sponge iron is 0.5-2 mm.
4. The low shrinkage waterproof concrete for underground works according to claim 1, wherein: the particle size of the fine aggregate is 0-5mm, wherein the mass percentage of the fine material with the particle size of 1-3.5mm accounts for 55-70 wt%; the grain diameter of the coarse aggregate is 5-20mm, wherein the mass percentage of the coarse material with the diameter of 8-12mm accounts for 60-80 wt%.
5. The low shrinkage waterproof concrete for underground works according to claim 1, wherein: the water reducing rate of the polycarboxylic acid high-efficiency water reducing agent is not less than 23.5%.
6. The low shrinkage waterproof concrete for underground works according to any one of claims 1 to 5, which is prepared by the following process:
taking materials according to parts by weight, blending coarse aggregate and fine aggregate to obtain composite aggregate, blending 1/3 composite aggregate and a composite fiber material to obtain a first mixed material, and blending 2/3 composite aggregate and a cementing material to obtain a second mixed material;
adding the mixing water into the second mixed material, uniformly stirring, adding the additive during stirring, finally adding the first mixed material under the stirring condition, and keeping stirring for 60-150s to obtain the water-based ink.
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