CN116217198A - Light-weight low-shrinkage high-strength sea sand mortar and preparation method thereof - Google Patents

Light-weight low-shrinkage high-strength sea sand mortar and preparation method thereof Download PDF

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CN116217198A
CN116217198A CN202310361737.5A CN202310361737A CN116217198A CN 116217198 A CN116217198 A CN 116217198A CN 202310361737 A CN202310361737 A CN 202310361737A CN 116217198 A CN116217198 A CN 116217198A
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parts
sea sand
mortar
compound
sand mortar
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曹海琳
郭书辉
翁履谦
候双双
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Shenzhen Aerospace New Material Technology Co ltd
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Shenzhen Aerospace New Material Technology Co ltd
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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
    • C04B28/14—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 calcium sulfate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C04B14/02—Granular materials, e.g. microballoons
    • 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
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
    • 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
    • C04B18/023—Fired or melted materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/32—Aluminous cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C04B2111/40—Porous or lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The application provides light-weight low-shrinkage high-strength sea sand mortar and a preparation method thereof, wherein the sea sand mortar comprises, by mass, 250-350 parts of silicate cement, 300-480 parts of sulphoaluminate cement, 100-200 parts of fly ash, 50-100 parts of silica fume, 100-200 parts of compound hollow microspheres, 200-300 parts of compound propping agent, 300-450 parts of sea sand, 5-15 parts of additive and 200-260 parts of water. Three hollow microspheres with different particle sizes are used as lightweight aggregate, three propping agents with different particle sizes are used as brackets, and the three propping agents are compounded to form a close-packed structure, so that the volume weight of the mortar can be reduced, and the strength of the mortar can be improved; the sulphoaluminate cement has good adjustable expansion performance, and the contraction of mortar can be fully compensated by adopting the sulphoaluminate cement as a cementing material; by adopting sea sand to replace river sand as aggregate, river sand and a large amount of fresh water resources can be saved.

Description

Light-weight low-shrinkage high-strength sea sand mortar and preparation method thereof
Technical Field
The application relates to the technical field of building mortar, in particular to light-weight, low-shrinkage and high-strength sea sand mortar and a preparation method thereof.
Background
The mortar is a common building construction material in the field of building engineering, and can be used for foundation grouting, plastering, construction joint embedding, repairing and reinforcing and the like of engineering. With the development of society, people put forth higher performance requirements on mortar materials, such as environmental protection, energy saving, light weight, high strength, durability, low shrinkage, crack resistance, permeability resistance, fire resistance, sound insulation and the like.
The traditional cement mortar has the defects of low strength, large volume weight, large shrinkage after hardening and the like, cannot meet the actual engineering requirements in certain fields, for example, the traditional cement mortar is difficult to fill and compact when used for grouting, is easy to crack and fall off when used for plastering, so that the wall decoration effect is poor, gaps are formed between a repairing material and a structural body again when the traditional cement mortar is used for repairing, the repairing effect is affected, and in addition, the traditional cement mortar has the defects of slow setting and hardening and low early strength when used for repairing, so that the construction period of repairing engineering is prolonged, and the requirement of quick repair of certain engineering is difficult to be met.
Disclosure of Invention
In view of the above problems, the present application has been made in order to provide a lightweight low shrinkage high strength sea sand mortar and a method for preparing the same, which overcomes the problems or at least partially solves the problems, comprising:
the light-weight low-shrinkage high-strength sea sand mortar comprises the following components in parts by weight: 250-350 parts of silicate cement, 300-480 parts of sulphoaluminate cement, 100-200 parts of fly ash, 50-100 parts of silica fume, 100-200 parts of compound hollow microspheres, 200-300 parts of compound propping agent, 300-450 parts of sea sand, 5-15 parts of additive and 200-260 parts of water; wherein the compound hollow microsphere comprises at least three hollow microspheres with different particle diameters; the compound proppants comprise at least three proppants with different particle sizes.
Preferably, the compound hollow microsphere comprises a first hollow microsphere with the particle size of 75-100 microns, a second hollow microsphere with the particle size of 100-150 microns and a third hollow microsphere with the particle size of 150-250 microns, wherein the mass ratio of the first hollow microsphere to the second hollow microsphere to the third hollow microsphere is (1-3): (4-6): (2-4).
Preferably, the compound hollow microsphere is prepared by firing at 1400 ℃.
Preferably, the compound propping agent comprises a first ceramsite with the mesh number of 20-40, a second ceramsite with the mesh number of 40-70 and a third ceramsite with the mesh number of 70-140, wherein the mass ratio of the first ceramsite to the second ceramsite to the third ceramsite is (1-3): (3-5): (3-5).
Preferably, the mass ratio of the spherical particles in the fly ash is more than 95%, wherein the mass ratio of the spherical particles with the particle size less than or equal to 1 μm is more than 90%.
Preferably, the additive comprises a water reducing agent, a defoaming agent, a retarder and a thickening agent; the water reducer comprises a powder water reducer and a liquid water reducer, wherein the mass ratio of the powder water reducer to the liquid water reducer is (1-3): (14-16).
Preferably, the method further comprises the following steps of: 20-50 parts of gypsum.
Preferably, the method further comprises the following steps of: 5-12 parts of polypropylene fiber.
Preferably, the length of the polypropylene fiber is 15-25mm, the tensile strength is more than 500Mpa, and the elastic modulus is more than 4500Mpa.
The preparation method of the sea sand mortar comprises the following steps:
placing dry components in the silicate cement, the sulphoaluminate cement, the fly ash, the silica fume, the compound hollow microspheres, the compound propping agent, the sea sand and the additive into a dry powder mortar mixer, and uniformly stirring for 15-20min to obtain a mixed dry material;
placing the mixed dry material into a concrete mixer, uniformly stirring for 1-2min, adding the water-based component in the additive and the water, and uniformly stirring for 5-8min to obtain mixed slurry;
and vibrating, forming and curing the mixed slurry to obtain the sea sand mortar.
The application has the following advantages:
in the embodiment of the application, for the problem that traditional cement mortar is low in strength and large in volume weight, the application provides a solution for reducing mortar volume weight and improving mortar strength by compounding hollow microspheres and propping agents, specifically: the lightweight low-shrinkage high-strength sea sand mortar comprises the following components in parts by weight: 250-350 parts of silicate cement, 300-480 parts of sulphoaluminate cement, 100-200 parts of fly ash, 50-100 parts of silica fume, 100-200 parts of compound hollow microspheres, 200-300 parts of compound propping agent, 300-450 parts of sea sand, 5-15 parts of additive and 200-260 parts of water; wherein the compound hollow microsphere comprises at least three hollow microspheres with different particle diameters; the compound proppants comprise at least three proppants with different particle sizes. The hollow microspheres with at least three different particle sizes are used as lightweight aggregate, the propping agents with at least three different particle sizes are used as brackets, and the hollow microspheres and the propping agents are compounded to form a close-packed structure, so that the volume weight of the mortar can be reduced (the volume weight of the sea sand mortar is 1500-1700kg/m 3 The volume weight of the traditional cement mortar is about 2000kg/m 3 Namely, the volume weight of the sea sand mortar is reduced by about 15% -25% compared with that of the traditional cement mortar, and meanwhile, the strength of the mortar is improved (the strength of the sea sand mortar reaches more than 80 MPa); the sulfoaluminate cement has good adjustable expansion performance, and by adopting the sulfoaluminate cement as a cementing material, the contraction of the mortar can be fully compensated, and meanwhile, the strength of the mortar can be improved; by adopting the sea sand to replace river sand as aggregate, natural river sand can be saved, and the sea sand does not need fresh water flushing, so that a large amount of fresh water resources can be saved; in addition, the fly ash, the hollow microspheres and the propping agent are all round spheres, so that the flow of mortar can be increasedThe hollow microsphere is formed by high-temperature calcination, has a smooth surface and is similar to a glass body, the viscosity of mortar can be further reduced, the fluidity is increased, and the construction is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the present application will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a step flowchart of a method for preparing sea sand mortar according to an embodiment of the present application.
Detailed Description
In order to make the objects, features and advantages of the present application more comprehensible, the present application is described in further detail below with reference to the accompanying drawings and detailed description. It will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In an embodiment of the application, a lightweight, low-shrinkage and high-strength sea sand mortar is provided, which comprises the following components in parts by weight: 250-350 parts of silicate cement, 300-480 parts of sulphoaluminate cement, 100-200 parts of fly ash, 50-100 parts of silica fume, 100-200 parts of compound hollow microspheres, 200-300 parts of compound propping agent, 300-450 parts of sea sand, 5-15 parts of additive and 200-260 parts of water; wherein the compound hollow microsphere comprises at least three hollow microspheres with different particle diameters; the compound proppants comprise at least three proppants with different particle sizes.
In the embodiment of the application, for the problem that traditional cement mortar is low in strength and large in volume weight, the application provides a solution for reducing mortar volume weight and improving mortar strength by compounding hollow microspheres and propping agents, specifically: light, low-shrinkage and high-strength seaThe sand mortar comprises the following components in parts by weight: 250-350 parts of silicate cement, 300-480 parts of sulphoaluminate cement, 100-200 parts of fly ash, 50-100 parts of silica fume, 100-200 parts of compound hollow microspheres, 200-300 parts of compound propping agent, 300-450 parts of sea sand, 5-15 parts of additive and 200-260 parts of water; wherein the compound hollow microsphere comprises at least three hollow microspheres with different particle diameters; the compound proppants comprise at least three proppants with different particle sizes. The hollow microspheres with at least three different particle sizes are used as lightweight aggregate, the propping agents with at least three different particle sizes are used as brackets, and the hollow microspheres and the propping agents are compounded to form a close-packed structure, so that the volume weight of the mortar can be reduced (the volume weight of the sea sand mortar is 1500-1700kg/m 3 The volume weight of the traditional cement mortar is about 2000kg/m 3 Namely, the volume weight of the sea sand mortar is reduced by about 15% -25% compared with that of the traditional cement mortar, and meanwhile, the strength of the mortar is improved (the strength of the sea sand mortar reaches more than 80 MPa); the sulphoaluminate cement has good adjustable expansion performance, and the contraction of mortar can be fully compensated by adopting the sulphoaluminate cement as a cementing material; in addition, natural river sand can be saved by adopting the sea sand to replace river sand as aggregate, and the sea sand does not need fresh water flushing, so that a large amount of fresh water resources can be saved.
Next, a lightweight, low shrinkage, high strength sea sand mortar of the present exemplary embodiment will be further described.
In this embodiment, the compound hollow bead includes a first hollow bead with a particle size of 75-100 μm, a second hollow bead with a particle size of 100-150 μm, and a third hollow bead with a particle size of 150-250 μm, where the mass ratio of the first hollow bead to the second hollow bead to the third hollow bead is (1-3): (4-6): (2-4), preferably 2:5:3.
in the embodiment, the wall thickness of the compound hollow microsphere is 8% -15% of the diameter, and the floating rate is more than or equal to 98%; the bulk density of the compound hollow microsphere is 350-600kg/m 3 The apparent density is 600-850kg/m 3 。
In this embodiment, the composite hollow microsphere is fired at 1400 ℃. In particular, the method comprises the steps of,the compound hollow microsphere comprises SiO 2 、Al 2 O 3 And Fe (Fe) 2 O 3 Wherein the SiO 2 Is 45-65% by mass of the Al 2 O 3 The mass ratio of the Fe is 25-45 percent 2 O 3 The mass ratio of (2-8%). The compound hollow microsphere is formed by high-temperature calcination, has a smoother surface, is similar to a glass body, can reduce the viscosity of mortar, increases the fluidity, and is convenient for construction.
In this embodiment, the compound proppant includes a first ceramsite with a mesh number of 20-40, a second ceramsite with a mesh number of 40-70, and a third ceramsite with a mesh number of 70-140, wherein the mass ratio of the first ceramsite to the second ceramsite to the third ceramsite is (1-3): (3-5): (3-5), preferably 2:4:4.
in this embodiment, the apparent density of the compound proppants is 1450-1850kg/m 3 。
In the embodiment, the Portland cement is PII 52.5 cement, and has the characteristics of high strength, impermeability and corrosion resistance.
In this example, the mass ratio of the spherical particles in the fly ash is more than 95%, wherein the mass ratio of the spherical particles with the particle diameter less than or equal to 1 μm is more than 90%. By adopting the fly ash with the main component of spherical particles, the fly ash, the hollow microsphere and the propping agent are of spherical structures, so that the mortar has good fluidity and is convenient for construction.
In this embodiment, siO in the silica fume 2 The mass ratio of (2) is more than or equal to 96%; the average grain diameter of the silica fume is 0.1-0.15 mu m, and the 7d activity index is more than or equal to 110 percent.
In the embodiment, the fineness modulus of the sea sand is 2.5, and the grain diameter is less than 5mm.
In this embodiment, the additive includes a water reducing agent, a defoamer, a retarder, and a thickener; the water reducer comprises a powder water reducer and a liquid water reducer, wherein the mass ratio of the powder water reducer to the liquid water reducer is (1-3): (14-16), preferably 2:15. specifically, the powder water reducer and the liquid water reducer are both polycarboxylic acid water reducer, the model of the powder water reducer is cilka 325C, and the model of the liquid water reducer is red wall JSM3; the defoaming agent is a polyether modified polysiloxane defoaming agent, and the model is P803; the retarder is tartaric acid; the thickener is of the type T400.
In this embodiment, the method further includes, in parts by weight: 20-50 parts of gypsum. The setting and hardening speed of the gypsum is high, the gypsum has micro expansibility after hydration, the volume is stable after hardening, shrinkage cracking is not easy to occur, and the gypsum is added, so that the mortar can be prevented from shrinking greatly after hardening.
In this embodiment, the method further includes, in parts by weight: 5-12 parts of polypropylene fiber. The polypropylene fiber can resist shrinkage of mortar, improve water retention of the mortar, uniformly disperse the stirred polypropylene fiber in a mortar matrix, and inhibit sinking of particles in the mortar, so that capillary channels formed by water overflow in the mortar are reduced, crack generation is delayed, crack development is controlled, and meanwhile, strength of the mortar can be improved.
In this example, the polypropylene fiber has a length of 15-25mm, a tensile strength of > 500MPa and an elastic modulus of > 4500MPa. By adopting the short fiber, the mixed mortar is convenient to uniformly disperse in a mortar matrix after stirring, and meanwhile, the influence on the volume weight of the mortar is reduced.
Referring to fig. 1, in an embodiment of the present application, there is also provided a method for preparing the sea sand mortar as described above, including:
s110, placing dry components in the silicate cement, the sulphoaluminate cement, the fly ash, the silica fume, the compound hollow microspheres, the compound propping agent, the sea sand and the additive into a dry powder mortar mixer, and uniformly stirring for 15-20min to obtain a mixed dry material;
s120, placing the mixed dry material into a concrete mixer, uniformly stirring for 1-2min, adding the water-based component in the additive and the water, and uniformly stirring for 5-8min to obtain mixed slurry;
and S130, vibrating, forming and maintaining the mixed slurry to obtain the sea sand mortar.
Next, a method for preparing the sea sand mortar according to the present exemplary embodiment as described above will be further described.
And (2) as described in the step S110, placing dry components in the Portland cement, the sulphoaluminate cement, the fly ash, the silica fume, the compound hollow microspheres, the compound propping agent, the sea sand and the additive into a dry powder mortar mixer, and uniformly stirring for 15-20min to obtain a mixed dry material.
And (3) placing the silicate cement, the sulphoaluminate cement, the fly ash, the silica fume, the compound hollow microspheres, the compound propping agent, the sea sand and the powder water reducing agent (in some embodiments, the gypsum) into a dry powder mortar stirrer, and uniformly stirring for 15-20min to obtain the mixed dry material.
And (3) as in the step S120, placing the mixed dry material into a concrete mixer, uniformly stirring for 1-2min, adding the water-based component in the additive and the water, and uniformly stirring for 5-8min to obtain mixed slurry.
Placing the mixed dry material into a concrete mixer, uniformly stirring for 1-2min, adding the liquid water reducing agent, the defoamer, the retarder, the thickener and the water while stirring, and uniformly stirring for 5-8min (in some embodiments, the polypropylene fiber can be slowly added while stirring after the steps are finished, and uniformly stirring for 2-3 min), so as to obtain the mixed slurry.
And (3) vibrating, forming and curing the mixed slurry to obtain the sea sand mortar as shown in the step S130.
And (3) vertically pumping (fast and slow plugging, uniform arrangement of plugging points, point-by-point movement and sequential execution) the mixed slurry by adopting a vibrator so as to compact and uniformly mix the mixed slurry, covering and watering within 12h, wherein the watering times can keep the mixed slurry in a wet state, and the maintenance time is not less than 7d, so that the sea sand mortar is obtained.
The following are specific examples of the present application:
example 1
Weighing 325 parts of silicate cement, 450 parts of sulphoaluminate cement, 120 parts of fly ash, 90 parts of silica fume, 25 parts of gypsum, 150 parts of compound hollow microspheres, 210 parts of compound propping agent, 400 parts of sea sand, 2 parts of powder water reducer, 8 parts of liquid water reducer, 1.6 parts of defoaming agent, 2.4 parts of retarder, 0.6 part of thickener, 8 parts of polypropylene fiber and 215 parts of water according to mass parts;
wherein the Portland cement is PII 52.5 cement; the fly ash is first-grade fly ash, and the activity is 120%; siO in the silica fume 2 The mass ratio of the silica fume is more than or equal to 96 percent, and the average grain diameter of the silica fume is 0.1-0.15 mu m; the compound hollow microsphere comprises a first hollow microsphere with the particle size of 75-100 mu m, a second hollow microsphere with the particle size of 100-150 mu m and a third hollow microsphere with the particle size of 150-250 mu m, wherein the mass ratio of the first hollow microsphere to the second hollow microsphere to the third hollow microsphere is 2:5:3, a step of; the compound propping agent comprises a first ceramsite with the mesh number of 20-40, a second ceramsite with the mesh number of 40-70 and a third ceramsite with the mesh number of 70-140, wherein the mass ratio of the first ceramsite to the second ceramsite to the third ceramsite is 2:4:4, a step of; the fineness modulus of the sea sand is 2.5, and the grain diameter is less than 5mm; the powder water reducer is a Sichuan 325C; the liquid water reducer is a red wall JSM3; the defoamer is P803, and the retarder is tartaric acid; the thickener is T400; the length of the polypropylene fiber is 15-25mm, the tensile strength is more than 500Mpa, and the elastic modulus is more than 4500Mpa.
Adding the silicate cement, the sulphoaluminate cement, the fly ash, the silica fume, the gypsum, the compound hollow microsphere, the compound propping agent, the sea sand and the powder water reducer into a dry powder mortar mixer, and uniformly stirring for 17.5min to obtain a mixed dry material; adding the mixed dry material into a concrete mixer, uniformly stirring for 1.5min, adding the liquid water reducer, the defoamer, the retarder, the thickener and the water, uniformly stirring for 6.5min, adding the polypropylene fiber, and uniformly stirring for 2.5min to obtain the mixed slurry; and vibrating, forming and curing the mixed slurry to obtain the sea sand mortar.
The density of the sea sand mortar is 1628kg/m 3 The 28d compressive strength was 85.4MPa, and the shrinkage was 0.023%.
Example two
Weighing 340 parts of silicate cement, 445 parts of sulphoaluminate cement, 130 parts of fly ash, 80 parts of silica fume, 20 parts of gypsum, 158 parts of compound hollow microsphere, 200 parts of compound propping agent, 380 parts of sea sand, 2.5 parts of powder water reducer, 6.7 parts of liquid water reducer, 1.8 parts of defoaming agent, 2.2 parts of retarder, 0.7 part of thickener, 9 parts of polypropylene fiber and 235 parts of water according to mass parts;
wherein the Portland cement is PII 52.5 cement; the fly ash is first-grade fly ash, and the activity is 120%; siO in the silica fume 2 The mass ratio of the silica fume is more than or equal to 96 percent, and the average grain diameter of the silica fume is 0.1-0.15 mu m; the compound hollow microsphere comprises a first hollow microsphere with the particle size of 75-100 mu m, a second hollow microsphere with the particle size of 100-150 mu m and a third hollow microsphere with the particle size of 150-250 mu m, wherein the mass ratio of the first hollow microsphere to the second hollow microsphere to the third hollow microsphere is 2:5:3, a step of; the compound propping agent comprises a first ceramsite with the mesh number of 20-40, a second ceramsite with the mesh number of 40-70 and a third ceramsite with the mesh number of 70-140, wherein the mass ratio of the first ceramsite to the second ceramsite to the third ceramsite is 2:4:4, a step of; the fineness modulus of the sea sand is 2.5, and the grain diameter is less than 5mm; the powder water reducer is a Sichuan 325C; the liquid water reducer is a red wall JSM3; the defoamer is P803, and the retarder is tartaric acid; the thickener is T400; the length of the polypropylene fiber is 15-25mm, the tensile strength is more than 500Mpa, and the elastic modulus is more than 4500Mpa.
Adding the silicate cement, the sulphoaluminate cement, the fly ash, the silica fume, the gypsum, the compound hollow microsphere, the compound propping agent, the sea sand and the powder water reducer into a dry powder mortar mixer, and uniformly stirring for 17.5min to obtain a mixed dry material; adding the mixed dry material into a concrete mixer, uniformly stirring for 1.5min, adding the liquid water reducer, the defoamer, the retarder, the thickener and the water, uniformly stirring for 6.5min, adding the polypropylene fiber, and uniformly stirring for 2.5min to obtain the mixed slurry; and vibrating, forming and curing the mixed slurry to obtain the sea sand mortar.
The density of the sea sand mortar is 1682kg/m 3 The 28d compressive strength was 88.6MPa, and the shrinkage was 0.018%.
Example III
Weighing 318 parts of silicate cement, 475 parts of sulphoaluminate cement, 150 parts of fly ash, 70 parts of silica fume, 35 parts of gypsum, 146 parts of compound hollow microspheres, 225 parts of compound propping agent, 415 parts of sea sand, 3 parts of powder water reducer, 6 parts of liquid water reducer, 2 parts of defoaming agent, 2 parts of retarder, 0.85 part of thickener, 12 parts of polypropylene fiber and 205 parts of water according to mass parts;
wherein the Portland cement is PII 52.5 cement; the fly ash is first-grade fly ash, and the activity is 120%; siO in the silica fume 2 The mass ratio of the silica fume is more than or equal to 96 percent, and the average grain diameter of the silica fume is 0.1-0.15 mu m; the compound hollow microsphere comprises a first hollow microsphere with the particle size of 75-100 mu m, a second hollow microsphere with the particle size of 100-150 mu m and a third hollow microsphere with the particle size of 150-250 mu m, wherein the mass ratio of the first hollow microsphere to the second hollow microsphere to the third hollow microsphere is 2:5:3, a step of; the compound propping agent comprises a first ceramsite with the mesh number of 20-40, a second ceramsite with the mesh number of 40-70 and a third ceramsite with the mesh number of 70-140, wherein the mass ratio of the first ceramsite to the second ceramsite to the third ceramsite is 2:4:4, a step of; the fineness modulus of the sea sand is 2.5, and the grain diameter is less than 5mm; the powder water reducer is a Sichuan 325C; the liquid water reducer is a red wall JSM3; the defoamer is P803, and the retarder is tartaric acid; the thickener is T400; the length of the polypropylene fiber is 15-25mm, the tensile strength is more than 500Mpa, and the elastic modulus is more than 4500Mpa.
Adding the silicate cement, the sulphoaluminate cement, the fly ash, the silica fume, the gypsum, the compound hollow microsphere, the compound propping agent, the sea sand and the powder water reducer into a dry powder mortar mixer, and uniformly stirring for 17.5min to obtain a mixed dry material; adding the mixed dry material into a concrete mixer, uniformly stirring for 1.5min, adding the liquid water reducer, the defoamer, the retarder, the thickener and the water, uniformly stirring for 6.5min, adding the polypropylene fiber, and uniformly stirring for 2.5min to obtain the mixed slurry; and vibrating, forming and curing the mixed slurry to obtain the sea sand mortar.
Through test, the density of the sea sand mortar is 1590kg/m 3 The 28d compressive strength was 82.3MPa, and the shrinkage was 0.015%.
While preferred embodiments of the present embodiments have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the present application.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The light-weight, low-shrinkage and high-strength sea sand mortar and the preparation method thereof provided by the application are described in detail, and specific examples are applied to the principle and the implementation mode of the application and are only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. The light-weight low-shrinkage high-strength sea sand mortar is characterized by comprising the following components in parts by weight: 250-350 parts of silicate cement, 300-480 parts of sulphoaluminate cement, 100-200 parts of fly ash, 50-100 parts of silica fume, 100-200 parts of compound hollow microspheres, 200-300 parts of compound propping agent, 300-450 parts of sea sand, 5-15 parts of additive and 200-260 parts of water; wherein the compound hollow microsphere comprises at least three hollow microspheres with different particle diameters; the compound proppants comprise at least three proppants with different particle sizes.
2. The sea sand mortar of claim 1, wherein the composite cenospheres comprise a first cenosphere having a particle size of 75-100 μιη, a second cenosphere having a particle size of 100-150 μιη, and a third cenosphere having a particle size of 150-250 μιη, wherein the mass ratio of the first cenosphere, the second cenosphere, and the third cenosphere is (1-3): (4-6): (2-4).
3. The sea sand mortar of claim 1, wherein the composite cenospheres are fired at 1400 ℃.
4. The sea sand mortar of claim 1, wherein the compounded proppant comprises a first ceramic grain having a mesh number of 20-40, a second ceramic grain having a mesh number of 40-70, and a third ceramic grain having a mesh number of 70-140, wherein the mass ratio of the first ceramic grain, the second ceramic grain, and the third ceramic grain is (1-3): (3-5): (3-5).
5. A sea sand mortar according to claim 1, wherein the mass fraction of spherical particles in the fly ash is > 95%, wherein the mass fraction of spherical particles having a particle size of 1 μm or less is > 90%.
6. A sea sand mortar according to claim 1, wherein the admixture comprises a water reducing agent, a defoamer, a retarder and a thickener; the water reducer comprises a powder water reducer and a liquid water reducer, wherein the mass ratio of the powder water reducer to the liquid water reducer is (1-3): (14-16).
7. The sea sand mortar of claim 1, further comprising, in parts by mass: 20-50 parts of gypsum.
8. The sea sand mortar of claim 1, further comprising, in parts by mass: 5-12 parts of polypropylene fiber.
9. Sea sand mortar according to claim 8, wherein the polypropylene fibers have a length of 15-25mm, a tensile strength > 500Mpa and an elastic modulus > 4500Mpa.
10. A method for preparing a sea sand mortar according to any of claims 1-6, comprising:
placing dry components in the silicate cement, the sulphoaluminate cement, the fly ash, the silica fume, the compound hollow microspheres, the compound propping agent, the sea sand and the additive into a dry powder mortar mixer, and uniformly stirring for 15-20min to obtain a mixed dry material;
placing the mixed dry material into a concrete mixer, uniformly stirring for 1-2min, adding the water-based component in the additive and the water, and uniformly stirring for 5-8min to obtain mixed slurry;
and vibrating, forming and curing the mixed slurry to obtain the sea sand mortar.
CN202310361737.5A 2023-03-29 2023-03-29 Light-weight low-shrinkage high-strength sea sand mortar and preparation method thereof Pending CN116217198A (en)

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