CN114634338A - High-ductility cement-based composite material for wind-blown sand in desert and preparation method thereof - Google Patents
High-ductility cement-based composite material for wind-blown sand in desert and preparation method thereof Download PDFInfo
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- CN114634338A CN114634338A CN202210229566.6A CN202210229566A CN114634338A CN 114634338 A CN114634338 A CN 114634338A CN 202210229566 A CN202210229566 A CN 202210229566A CN 114634338 A CN114634338 A CN 114634338A
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- 239000004568 cement Substances 0.000 title claims abstract description 89
- 239000004576 sand Substances 0.000 title claims abstract description 78
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000000835 fiber Substances 0.000 claims abstract description 70
- 239000010881 fly ash Substances 0.000 claims abstract description 41
- 229920001971 elastomer Polymers 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 239000003292 glue Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 239000011863 silicon-based powder Substances 0.000 claims description 8
- 239000004816 latex Substances 0.000 claims description 6
- 229920000126 latex Polymers 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 239000003755 preservative agent Substances 0.000 claims description 6
- 230000002335 preservative effect Effects 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 3
- 239000002956 ash Substances 0.000 claims description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 15
- 238000005336 cracking Methods 0.000 abstract description 10
- 239000004566 building material Substances 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 2
- 238000011282 treatment Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract 1
- 239000004698 Polyethylene Substances 0.000 description 13
- 239000011159 matrix material Substances 0.000 description 10
- 238000005452 bending Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0641—Polyvinylalcohols; Polyvinylacetates
-
- 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
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- 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
Abstract
The invention belongs to the technical field of civil engineering building materials, and discloses a high-ductility cement-based composite material for desert aeolian sand and a preparation method thereof, wherein the composite material is prepared from the following raw materials in parts by weight: 1.0 part of cement, 0.1-3 parts of desert aeolian sand, 0.1-4 parts of fly ash, 0-0.9 part of silica powder, 0.0005-0.004 part of rubber powder, and a water reducing agent accounting for 0.2-1% of the cement raw material by weight, wherein the fiber volume ratio is 0-3%, and the water-to-glue ratio is 0.32-0.38. The invention utilizes desert aeolian sand to completely replace the traditional river sand, uses fly ash and silica powder to replace partial cement, changes waste into valuable, does not contain coarse aggregate, does not need a large amount of additives, does not need to modify materials, does not need to wash the aeolian sand and other treatments, adds fibers, and adopts a simple and easily realized preparation process to prepare the high-ductility cement-based composite material with better mechanical property, thereby not only effectively improving the defects of low tensile strength, poor toughness and easy cracking of the traditional concrete, but also relieving the supply and demand contradiction of building materials, reducing the construction cost and protecting the environment.
Description
Technical Field
The invention belongs to the technical field of civil engineering building materials, and particularly relates to a high-ductility cement-based composite material for desert aeolian sand and a preparation method thereof.
Background
As the material with the largest consumption in the current building structure, the concrete has the advantages of low price, simple preparation process and the like. However, the common concrete has the defects of low tensile strength, small tensile deformation, brittle texture, difficult crack control after cracking and the like. Meanwhile, with the improvement of the demand of engineering on the building performance, the common concrete can not meet the requirements of modern engineering structures, and how to improve the performance of the concrete is one of the problems to be solved urgently at present.
The above disadvantages of concrete are essential and cannot be solved by improving the material of concrete, so related experts propose the concept of cement-based composite material-the concept of "compounding" is adopted to improve the performance of concrete material, and when fibers are used as reinforcing material, the concept of fiber reinforced cement-based composite material is provided. Although the tensile strength, the deformability and the like of the concrete can be greatly improved by adding the fibers with the three functions of crack resistance, reinforcement, toughening and the like into the concrete, the crack width is not easy to control under the action of load, and strain softening is easy to occur under the action of direct tensile load. These disadvantages have greatly limited the application of fiber reinforced concrete in engineering.
In order to overcome the defects of difficulty in controlling the crack width of the material, strain softening and the like, people begin to research a cement-based composite material by means of micromechanics and fracture mechanics, and the high-ductility cement-based composite material is a novel fiber-reinforced cement-based composite material, which takes cement, mineral admixture, aggregate, fiber, additive and the like as raw materials, has the ultimate elongation of not less than 0.5 percent under the action of axial tension, has obvious strain hardening behavior and multi-crack cracking characteristics when being subjected to bending and tensile loads, can overcome the defects of easiness in cracking, high brittleness and the like of the traditional concrete material, and has a good application prospect.
However, the traditional ECC material is mainly prepared from high-price quartz sand and imported PVA/PE fibers, so that the cost is high, and the ECC material is difficult to popularize and use in the field of building engineering. The ECC material prepared by using the common river sand to replace quartz sand can reduce the cost to a certain extent, however, in recent years, with the large-scale construction of the infrastructure of China, a large amount of sand resources are consumed, and meanwhile, the storage and quality of the river sand resources and the related national regulation for sandstone collection are considered, so that the contradiction between supply and demand of the sand for the building is increasingly prominent, and the current construction requirements cannot be met. Especially in northwest areas of China, the lack of the natural sand quantity per se causes the contradiction to be more serious, so that a new building material is urgently needed to replace the natural river sand. However, the desert aeolian sand resource is abundant in northwest China, the particle size of the desert aeolian sand is smaller and meets the requirements of ECC raw materials, if local materials can be obtained, the desert aeolian sand is reasonably utilized as building sand, and the ECC material is prepared, so that the resource can be saved, the construction cost is reduced, and a new choice is provided for the building material.
On the other hand, the method increases the proportion of the fly ash in the cementing material, reduces the dosage of cement, and is a method for reducing the preparation cost of the ECC material. Sinkiang province in northwest of China still mainly uses thermal power generation at present, and has abundant fly ash resources in addition to coal-fired heating in winter. At present, the fly ash is applied to certain extent in the building industry, but the total utilization rate is not high. The stacking of a large amount of surplus fly ash not only occupies valuable land resources, but also is easy to become a secondary pollution source of air and land. If the fly ash is used in a large amount, not only can cement clinker be saved, but also the defects of concrete materials can be improved. And the reasonable use of the fly ash can protect the environment. Therefore, the popularization and the use of the large-volume fly ash concrete not only have positive significance for the sustainable development of the building industry, but also indicate a feasible way for the harmonious interaction between people and nature and the sustainable development of the society.
For those skilled in the art, how to perfectly combine the industrial waste of fly ash with the natural resources of desert wind-laid sand to realize the reasonable development and utilization of local natural resources and industrial solid wastes, and obtain a building material with good performance, which meets the requirements of the modern building structure field, is one of the important problems to be solved urgently. CN110204273A discloses a desert sand cement-based composite material and a preparation process thereof, wherein the desert sand cement-based composite material is prepared from a main material, an auxiliary material I (water reducing agent), an auxiliary material II (fiber) and water, the water-to-gel ratio is 0.36-0.38, and the main material comprises the following components: 1.0 part by weight of cement, 1.0-3.5 parts by weight of desert sand, 2.0-4.0 parts by weight of fly ash, 0.1-0.5 part by weight of desulfurized gypsum and 0.15-0.6 part by weight of silica fume; the dosage of the water reducing agent accounts for 0.5 to 1 percent of the weight of the cement; the volume ratio of the fiber is 0-2%, but the scheme can only obtain common fiber concrete materials and cannot obtain high-ductility cement-based composite materials.
Disclosure of Invention
The invention aims to solve the problems of the defects of the existing building materials and high cost of the traditional ECC, and provides a desert aeolian sand high-ductility cement-based composite material and a preparation method thereof.
In order to achieve the purpose, the invention relates to a desert aeolian sand high-ductility cement-based composite material which comprises the following raw materials in parts by weight: 1.0 part of cement, 0.1-3 parts of desert aeolian sand, 0.1-4 parts of fly ash, 0-0.9 part of silica powder, 0.0005-0.004 part of rubber powder, and a water reducing agent accounting for 0.2-1% of the cement raw material by weight, wherein the fiber volume ratio is 0-3%, and the water-to-glue ratio is 0.32-0.38.
Preferably, the cement is any one or a mixture of more than two of ordinary portland cement of grades 42.5, 52.5 and 62.5 or other types of cement.
Preferably, the fly ash is grade I fly ash, grade II fly ash or raw ash of coal-fired thermal power plants.
Preferably, the fibers are any one or a mixture of more than two of ultra-high molecular weight polyethylene fibers, high-strength and high-modulus polyvinyl alcohol fibers or polypropylene fibers.
Preferably, the water reducing agent is a polycarboxylic acid series high-efficiency water reducing agent.
Preferably, the rubber powder is redispersible latex powder and/or hydroxypropyl methyl cellulose.
The invention also relates to a preparation method of the desert aeolian sand high-ductility cement-based composite material, which comprises the following steps of:
1) preparing materials: 1.0 part of cement, 0.32-0.38 part of water-cement ratio, 0.1-3 parts of desert aeolian sand, 0.1-4 parts of fly ash, 0-0.9 part of silicon powder, 0.0005-0.004 part of rubber powder, 0-3% of fiber volume ratio, 6-18 mm of fiber length and 0.2-1% of water reducing agent in weight of cement;
2) feeding and stirring in sequence: firstly, putting cement, fly ash, silicon powder, desert aeolian sand and rubber powder into a stirring barrel, carrying out slow dry stirring for 2-3min, adding a mixture of water and a water reducing agent which are uniformly stirred in a stirring container in advance into the stirring barrel, carrying out slow wet stirring for 2-3min, finally adding fibers which are well dispersed in advance, stirring while adding until all the fibers are added, carrying out slow stirring for 2-3min, and then carrying out fast stirring for 2-3 min;
3) molding: pouring the prepared mixture into a prepared mould, and vibrating and molding;
4) and (5) maintenance: covering a layer of preservative film on the prepared test piece with the mold, removing the preservative film after 24 hours, removing the mold of the test piece with the mold, and then curing the test piece after mold removal to the test age under the standard condition, namely the temperature is 20 +/-2 ℃, and the relative humidity is more than 95%.
Preferably, in the step 2), the fibers must be uniformly dispersed in the matrix to fully exert the reinforcing, toughening and crack-resisting characteristics of the fibers, the fibers are dispersed until no obvious bundling phenomenon exists before stirring, and a small amount of the fibers are slowly added in the stirring process, so that the fibers are uniformly dispersed in the material, and the ductility and toughness of the desert aeolian sand high-ductility cement-based composite material are improved.
Preferably, in the step 2), the slow speed is 200-250r/min, and the fast speed is 900-950 r/min.
Compared with the prior art, the invention has the following beneficial effects:
(1) the raw materials are simple in composition, excessive treatment and modification of the raw materials are not needed, and the preparation process is simple and easy to implement; the invention completely selects the desert aeolian sand as the fine aggregate, and uses the fly ash and the silicon powder to replace part of cement, so that the natural resource of the desert aeolian sand and two industrial solid wastes of the fly ash and the silicon powder are fully utilized, and the engineering cost is obviously reduced;
(2) the blending amount of the fly ash can be large, so that the cement in the cementing material is saved, the resource utilization of industrial wastes is realized, and the environment is protected; the desert aeolian sand is used for replacing common sand, so that the problem of contradiction between supply and demand of the current building sand is relieved while natural resources are reasonably utilized;
(3) the invention selects the polyethylene fiber (PE fiber) with ultrahigh molecular weight or the polyvinyl alcohol fiber (PVA fiber) with high strength and high modulus or the polypropylene fiber (PP fiber) with better economic angle and performance angle to prepare the cement-based composite material with high ductility for the wind-laid sand in the desert and excellent performance.
(4) The components of the invention use rubber powder with a certain proportion, which is beneficial to improving the tensile strain of cement-based materials besides the most basic thickening effect. Because the redispersible latex powder has stronger cohesive property, the elasticity of the matrix can be improved, namely, the elastic modulus of the matrix is reduced. Meanwhile, the addition of the redispersible latex powder reduces the cracking strength of the matrix, the smaller the cracking strength of the matrix is, the more favorable the stable multi-crack cracking of the ECC is according to the ECC (cement-based composite) strength criterion, but on the other hand, because the elasticity of the matrix is greatly increased, the damage mode is different from the brittle failure of the traditional concrete, the critical dimension of the unstable damage of the matrix crack is correspondingly increased, the fracture toughness and the crack tip toughness of the matrix are also increased, and the stable multi-crack cracking of the ECC is not favorable according to the ECC energy criterion. Under the combined influence of the two aspects, the multi-crack cracking characteristic and the strain hardening behavior of ECC are difficult to exert, but the high ultimate tensile strain is still maintained under the condition of less crack propagation and cracking due to the strong toughness of the matrix. Therefore, the addition of the redispersible latex powder and the blending amount thereof are very important for the ECC to achieve better strain hardening performance.
(5) The preparation method has short preparation time, and the high-ductility cement-based composite material with small difference of compressive strength and flexural strength and better uniaxial tensile property can be obtained in shorter stirring time.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the invention.
Example 1
A matrix of a desert aeolian sand high-ductility cement-based composite material is composed of the following raw materials in parts by weight: 42.5 parts of cement, 1.5 parts of fly ash, 1.55 parts of desert aeolian sand, 0.004 parts of water reducing agent and rubber powder respectively, and the water-rubber ratio is 0.34.
Example 2
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 52.5 parts of cement, 0.429 part of fly ash, 0.429 part of desert aeolian sand, 2 percent of PE fiber volume ratio, 12mm of fiber length, 0.004 part of water reducing agent, 0.001 part of rubber powder and 0.38 part of water-rubber ratio.
Example 3
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 2.4 parts of fly ash, 0.15 part of silicon powder, 0.1 part of desert aeolian sand, 1.5 percent of PE fiber volume ratio, 12mm of fiber length, 0.004 part of water reducing agent, 0.002 part of rubber powder and 0.38 of water-to-rubber ratio.
Example 4
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 0.5 part of fly ash, 0.15 part of silica powder, 1.5 parts of desert aeolian sand, 1.5 parts of PE fiber with the volume ratio of 1.5 percent and the fiber length of 12mm, 0.004 part of water reducing agent, 0.0005 part of rubber powder and 0.36 of water-to-rubber ratio.
Example 5
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 1.0 part of fly ash, 0.75 part of desert aeolian sand, 1.5 percent of PE fiber volume ratio, 12mm fiber length, 0.004 part of each of water reducing agent and rubber powder, and 0.32 of water-to-rubber ratio.
Example 6
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 1.5 parts of fly ash, 0.9 part of silica powder, 0.75 part of desert aeolian sand, 1.5 percent of PE fiber volume ratio, 12mm fiber length, 0.004 part of each of water reducing agent and rubber powder, and 0.34 part of water-to-rubber ratio.
Example 7
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 3.5 parts of fly ash, 0.75 part of desert aeolian sand, 1.5 percent of PE fiber volume ratio, 12mm fiber length, 0.004 part of each of water reducing agent and rubber powder, and 0.34 part of water-to-rubber ratio.
Example 8
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 1.5 parts of fly ash, 2.35 parts of desert aeolian sand, 1.5 percent of PE fiber volume ratio, 12mm fiber length, 0.004 parts of water reducing agent and rubber powder respectively, and 0.34 of water-to-rubber ratio.
Example 9
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 1.5 parts of fly ash, 1.55 parts of desert aeolian sand, 1.25% of PE fiber volume ratio, 6mm of fiber length, 0.004 parts of water reducing agent and rubber powder respectively, and 0.34 of water-to-rubber ratio.
Example 10
A desert aeolian sand high-ductility cement-based composite material is composed of the following raw materials in parts by weight: 42.5 parts of cement, 1.5 parts of fly ash, 1.55 parts of desert aeolian sand, 1.5 percent of PE fiber volume ratio, 18mm fiber length, 0.004 parts of water reducing agent and rubber powder respectively, and 0.34 of water-to-rubber ratio.
Example 11
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 1.5 parts of fly ash, 1.55 parts of desert aeolian sand, 1.25% of PE fiber volume ratio, 0.25% of PVA fiber volume ratio, 12mm of fiber length, 0.004 parts of water reducing agent and rubber powder respectively, and 0.34 of water-rubber ratio.
Example 12
A high-ductility cement-based composite material for desert aeolian sand comprises the following raw materials in parts by weight: 42.5 parts of cement, 3 parts of fly ash, 0.75 part of desert aeolian sand, 1.5 percent of PVA fiber volume ratio, 12mm of fiber length, 0.004 part of each of water reducing agent and rubber powder, and 0.34 part of water-to-rubber ratio.
In the above examples 1 to 12, the cement was 42.5 or 52.5 ordinary portland cement; the fly ash is I-grade fly ash; the average grain diameter of the desert aeolian sand is less than or equal to 110 mu m; the fiber is ultra-high molecular weight polyethylene or high-strength high-modulus polyvinyl alcohol fiber; the water reducing agent and the rubber powder are respectively a polycarboxylic acid high-efficiency water reducing agent and redispersible latex powder.
The preparation method of the desert aeolian sand high-ductility cement-based composite material disclosed by the embodiments 1 to 12 is simple, easy to operate and easy to realize, and comprises the following steps:
(1) batching, wherein batching is carried out according to the specific formula of each embodiment;
(2) feeding and stirring in sequence: firstly putting cement, fly ash, silicon powder, desert aeolian sand and rubber powder into a stirring barrel, carrying out dry stirring at a slow speed (250r/min) for 2min, adding a mixture of water and a water reducing agent which are uniformly stirred in a stirring container in advance into the stirring barrel, carrying out wet stirring at the slow speed (250r/min) for 2min, finally adding the fibers which are well dispersed in advance, stirring while adding until all the fibers are added, carrying out stirring at the slow speed (250r/min) for 2min, and then carrying out rapid stirring (950r/min) for 2 min;
(3) molding: pouring the prepared mixture into a prepared mould, and vibrating for molding;
(4) and (5) maintenance: covering a layer of preservative film on the prepared test piece with the die, removing the preservative film after 24 hours, removing the die from the test piece with the die, and then curing the test piece after the die is removed to 7d and 28d under the standard condition, namely the temperature is 20 +/-2 ℃, and the relative humidity is more than 95%.
The desert aeolian sand high-ductility cement-based composite material prepared by the method of the embodiment 1 to 12 is subjected to fluidity test according to relevant regulations in a cement mortar fluidity determination method (GB/T2419-2016); manufacturing cubic test blocks with the size of 70.7mm multiplied by 70.7mm, wherein three test blocks are prepared in each age period, and carrying out compression resistance test on the test blocks according to relevant regulations in building mortar basic performance test method standard (JGJ/T70-2009); manufacturing prism test blocks with the size of 40mm multiplied by 160mm, wherein three test blocks are prepared in each age period, and carrying out the bending resistance test on the test blocks according to the relevant regulations in the cement mortar strength test method (GB 17671-1999); a dumbbell-shaped test block with the size of 250mm multiplied by 60mm multiplied by 15mm is manufactured, three test blocks are manufactured in each age period, and the tensile property test is carried out on the test blocks according to relevant regulations in the high-ductility fiber reinforced cement-based composite material mechanical property test method (JC/T2461-2018). The test results are shown in the following tables 1-2:
TABLE 1 test results of working properties and mechanical properties (compression resistance, bending resistance) of different examples
TABLE 2 uniaxial tensile test results for various examples
As can be seen from the test results in tables 1-2, the high-ductility cement-based composite material for desert aeolian sand provided by the invention has better working and mechanical properties, the bending toughness of the material 28d is evaluated by referring to ASTMC1018, the calculation result is shown in Table 3, and most of the obtained results are IT>T, shows that the cement-based composite material with high ductility for desert aeolian sand provided by the invention has better toughness, and is a tough material, and ITThe larger the toughness of the material.
TABLE 3 calculation results of bending toughness of various examples
Therefore, the cement-based composite material obtained by combining the components with different mixing amounts has good uniaxial tensile property, and the compressive strength, the flexural strength and the bending toughness all meet the most basic requirements of the high-ductility cement-based composite material.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. The desert aeolian sand high-ductility cement-based composite material is characterized by comprising the following raw materials in parts by weight: 1.0 part of cement, 0.1-3 parts of desert aeolian sand, 0.1-4 parts of fly ash, 0-0.9 part of silica powder, 0.0005-0.004 part of rubber powder, and a water reducing agent accounting for 0.2-1% of the cement raw material by weight, wherein the fiber volume ratio is 0-3%, and the water-to-glue ratio is 0.32-0.38.
2. The high ductility cement-based composite material for desert aeolian sand according to claim 1, characterized in that said cement is any one or a mixture of more than two of ordinary portland cements with grades 42.5, 52.5 and 62.5.
3. The high-ductility cement-based composite material for the desert aeolian sand according to claim 1, wherein the fly ash is grade I fly ash, grade II fly ash or raw ash of a coal-fired thermal power plant.
4. The high-ductility cement-based composite material for desert wind-blown sand according to claim 1, wherein the fiber is any one or a mixture of more than two of ultra-high molecular weight polyethylene fiber, high-strength high-modulus polyvinyl alcohol fiber or polypropylene fiber.
5. The high-ductility cement-based composite material for desert aeolian sand as claimed in claim 1, wherein said water reducing agent is a polycarboxylic acid series high efficiency water reducing agent.
6. The high-ductility cement-based composite material for desert wind-laid sand as claimed in claim 1, wherein the rubber powder is redispersible latex powder and/or hydroxypropyl methyl cellulose.
7. The preparation method of the high-ductility cement-based composite material for the wind-blown sand in the desert as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
1) preparing materials: 1.0 part of cement, 0.32-0.38 part of water-cement ratio, 0.1-3 parts of desert aeolian sand, 0.1-4 parts of fly ash, 0-0.9 part of silicon powder, 0.0005-0.004 part of rubber powder, 0-3% of fiber volume ratio, 6-18 mm of fiber length and 0.2-1% of water reducing agent in weight of cement;
2) feeding and stirring in sequence: firstly, putting cement, fly ash, silicon powder, desert aeolian sand and rubber powder into a stirring barrel, carrying out slow dry stirring for 2-3min, adding a mixture of water and a water reducing agent which are uniformly stirred in a stirring container in advance into the stirring barrel, carrying out slow wet stirring for 2-3min, finally adding fibers which are well dispersed in advance, stirring while adding until all the fibers are added, carrying out slow stirring for 2-3min, and then carrying out fast stirring for 2-3 min;
3) molding: pouring the prepared mixture into a prepared mould, and vibrating for molding;
4) and (5) maintenance: covering a layer of preservative film on the prepared test piece with the mold, removing the preservative film after 24 hours, removing the mold of the test piece with the mold, and then curing the test piece after mold removal to the test age under the standard condition, namely the temperature is 20 +/-2 ℃, and the relative humidity is more than 95%.
8. The method for preparing the desert aeolian sand high-ductility cement-based composite material according to claim 7, wherein in the step 2), the fibers are dispersed until no obvious bundling phenomenon exists before stirring, and a small amount of the fibers are slowly added in a plurality of times during stirring, so that the fibers are uniformly dispersed in the material, and the ductility and the toughness of the desert aeolian sand high-ductility cement-based composite material are improved.
9. The method for preparing the cement-based composite material with high ductility for the wind-blown sand in the desert as claimed in claim 7, wherein in the step 2), the slow speed is 200-250r/min, and the fast speed is 900-950 r/min.
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| CN115108785A (en) * | 2022-07-18 | 2022-09-27 | 江苏大学 | Ultra-high-ductility double-doped fiber concrete and preparation method thereof |
| CN115819044A (en) * | 2022-12-15 | 2023-03-21 | 长安大学 | High-toughness aeolian sand wall surface decoration mortar and preparation method thereof |
| CN115849813A (en) * | 2022-12-02 | 2023-03-28 | 嘉兴学院 | Aggregate all-purpose aeolian sand concrete for building and preparation method thereof |
| CN115893959A (en) * | 2023-02-15 | 2023-04-04 | 石家庄铁道大学 | 3D printing desert sand ultrahigh-ductility concrete and preparation method thereof |
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