CN112010603A - High-water-permeability concrete and preparation method thereof - Google Patents
High-water-permeability concrete and preparation method thereof Download PDFInfo
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- CN112010603A CN112010603A CN202010833623.2A CN202010833623A CN112010603A CN 112010603 A CN112010603 A CN 112010603A CN 202010833623 A CN202010833623 A CN 202010833623A CN 112010603 A CN112010603 A CN 112010603A
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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
- 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
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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
- C04B14/383—Whiskers
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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
- C04B18/04—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
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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
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/122—Hydroxy amines
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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
- C04B2111/00008—Obtaining or using nanotechnology related 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- 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
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to high-water-permeability concrete and a preparation method thereof, belonging to the technical field of concrete materials, wherein the concrete comprises the following components in parts by weight: 350 parts of a cementing material 230-; wherein the cementing material comprises 180-280 parts of cement and 50-70 parts of slag; the industrial solid waste comprises 42-50 parts of silica fume and 40-52 parts of fly ash, and the concrete has high water permeability and high compressive strength.
Description
Technical Field
The application relates to the technical field of concrete materials, in particular to high-water-permeability concrete and a preparation method thereof.
Background
The high water permeability concrete is ecological concrete with a continuous pore structure. The pavement which is paved by the high-water-permeability concrete and has the water permeability has the advantages of reducing urban waterlogging, improving urban heat island effect, protecting underground water resources, reducing urban noise and the like, so that the high-water-permeability concrete is widely applied to pavement of water-permeable concrete pavements constructed in sponge cities.
The high-permeability concrete has excellent water permeability because it contains a large amount of pore structures, but a large amount of pore structures may make the inner structure of the high-permeability concrete comparatively loose, and the compactness of the high-permeability concrete is lower, thereby making the compressive strength of the high-permeability concrete reduce.
Disclosure of Invention
The concrete with high water permeability has high water permeability and high compressive strength;
the second purpose of the application is to provide a preparation method of the high-water-permeability concrete, the process is simple, and the prepared high-water-permeability concrete has higher compressive strength.
The above object of the present application is achieved by the following technical solutions:
the concrete with high water permeability comprises the following components in parts by weight: 350 parts of a cementing material 230-; wherein the cementing material comprises 180-280 parts of cement and 50-70 parts of slag; the industrial solid waste comprises 42-50 parts of silica fume and 40-52 parts of fly ash.
By adopting the technical scheme, after cement and water are mixed into cement paste, the cement paste can be coated on high-water-permeability concrete with holes uniformly distributed on the surface of coarse aggregate, and because the silica fume and the fly ash have a strong pozzolanic effect, when the silica fume and the fly ash are mixed with the cement paste and the like, the silica fume and the fly ash can be subjected to secondary hydration with calcium hydroxide serving as a cement hydration product to form a gelled product so as to fill larger holes in the high-water-permeability concrete, but if too much silica fume and fly ash are used, the water permeability of the high-water-permeability concrete can be influenced, so that the compressive strength of the concrete can be improved while the water permeability is not influenced by adding proper parts of the silica fume and the fly ash; the silica fume and the fly ash are matched for use, the powder particle grading is more optimized, the volcanic ash reaction is more sufficient, the compressive strength of the concrete is further improved, and the silica fume and the fly ash can be reduced by the aid of the synergistic effect of the silica fume and the fly ash, so that the possibility that the silica fume and the fly ash can affect the water permeability of the high-water-permeability concrete is reduced.
Hydroxyl contained in the triethanolamine can better reduce the aggregation of particles and the air cushion effect in the cement grinding process, improve the fluidity of the cement, promote the hydration reaction of the cement, ensure the hydration reaction of the cement to be more sufficient and improve the early compaction degree of the concrete; when the hydration reaction of the cement is more sufficient, the hydration product calcium hydroxide of the cement is increased, so that the secondary hydration action of the silica fume, the fly ash and the calcium hydroxide is promoted, the formed gel product is increased, the filling of larger pores in the high-water-permeability concrete is improved, and the compressive strength of the high-water-permeability concrete is improved; meanwhile, the triethanolamine is matched with the polycarboxylate water reducer to form the early-strength water reducer, so that the initial water reducing effect of the polycarboxylate water reducer is enhanced, the water-cement ratio reducing capacity of the polycarboxylate water reducer is improved, the compaction degree of the high-permeability concrete is improved, and the compressive strength of the high-permeability concrete is improved.
Calcium sulfate whisker hydration reaction can generate ettringite, the ettringite can be quickly crystallized to form a hard framework structure, the ettringite is dissolved in water to ensure that the hydration reaction of cement is sufficient, further the secondary hydration reaction of silica fume and fly ash is sufficient, the gel product formed integrally is increased, and the filling of larger pores of the pervious concrete is improved; however, when the amount of the calcium sulfate whiskers is too high, the calcium aluminate formed by the reaction is too much, so that the volume expansion is generated in the high-water-permeability concrete, the surface is cracked, and the strength of the high-water-permeability concrete is reduced, so that the compressive strength of the concrete can be improved by adding the calcium sulfate whiskers at a proper proportion.
The nano silicon dioxide can perform hydration reaction in a short time, actively reacts with a silica structure in cement, and improves the early strength of the high-water-permeability concrete, but when the doping amount of the nano silicon dioxide is too high, the specific surface area of the nano silicon dioxide is larger, so that the amount of water attached to the surface layer after water absorption blending is larger, the quantity of the nano silicon dioxide participating in hydration is reduced, and the hydration degree of the cement is reduced; meanwhile, the nano-silica consists of nano-scale particles, the main component of the nano-silica is amorphous silica, and the amorphous silica is doped into cement to be hydrated with the cement to generate gel to fill larger pores in the pervious concrete, so that the compressive strength of the high-permeability concrete is improved.
When the nano silicon dioxide and calcium hydroxide generated by cement hydration react again, the fly ash and the silica fume also react with the calcium hydroxide generated by the cement hydration again, and gel generated by the reaction of the nano silicon dioxide and the calcium hydroxide is wrapped around the fly ash and the silica fume at the same time, so that a micro-filling effect is realized on a structural micro system, a superposition effect is realized, the integral mechanical property of the high-water-permeability concrete is improved, and the compressive strength of the high-water-permeability concrete is further improved.
Meanwhile, the nano silicon dioxide and the calcium sulfate crystal whiskers play a role in promoting the hydration of the cement, and the hydration of the cement is more sufficient due to the synergy of the nano silicon dioxide and the calcium sulfate crystal whiskers, so that more reaction substances are provided for the secondary hydration of the fly ash, the silica fume and the nano silicon dioxide, more cement can be used, and the cost of the high-water-permeability concrete is saved.
Preferably, the concrete comprises the following components in parts by weight: 335 parts of a cementing material 245-; wherein the cementing material comprises 187.5 to 272.5 parts of cement and 57.5 to 62.5 parts of slag; the industrial solid waste comprises 44.5-47.5 parts of silica fume and 42.5-49.5 parts of fly ash.
By adopting the technical scheme, the calcium sulfate whisker, the triethanolamine and the nano-silica can promote the overall hydration reaction of cement, so that the hydration reaction of the cement is more sufficient, more reaction substances are provided for the secondary hydration of the fly ash, the silica fume and the nano-silica, the gel substances generated by the secondary hydration are increased, the filling of larger pores of the high-water-permeability concrete is improved, the compactness of the high-water-permeability concrete is improved while the water permeability of the water-permeable concrete is not influenced, and the compressive strength of the high-water-permeability concrete is improved.
Preferably, the weight ratio of the fly ash to the nano silicon dioxide is (4-4.3): 1.
By adopting the technical scheme, the nano silicon dioxide and the fly ash are mixed for use, so that the micro filling effect can be achieved between the bonding surfaces of the coarse aggregate, and the mechanical property of the water-permeable concrete is improved macroscopically; since the fly ash also contains silicon dioxide and the nano silicon dioxide can cooperate with calcium hydroxide generated by cement hydration to generate reaction, if the mixing proportion of the fly ash and the nano silicon dioxide is not controlled, when the generated gel coated around the coarse aggregate is too much, the internal pores of the high-water-permeability concrete can be excessively reduced, and the water permeability of the high-water-permeability concrete is influenced.
Preferably, the weight ratio of the calcium sulfate whisker, the cement and the water is 1: (16-17.2): (6-7.2).
Through adopting above-mentioned technical scheme, at suitable water-cement ratio within range, the compressive strength of the concrete that permeates water can be improved to the calcium sulfate whisker, nevertheless if the water-cement ratio is too little, the mobility of the concrete that permeates water worsens, add too much calcium sulfate whisker this moment, can continuously consume moisture, can make cement thick, greatly reduced the mobility of high water permeability concrete for the surface cracking of high water permeability concrete reduces the compressive strength of high water permeability concrete.
Preferably, the weight ratio of the calcium sulfate whiskers to the nano silicon dioxide is (1-1.46): 1.
by adopting the technical scheme, the nano silicon dioxide and the calcium sulfate whisker play a role in promoting the hydration of the cement, the nano silicon dioxide and the calcium sulfate whisker can generate a synergistic effect under the proportion to enable the hydration of the cement to be more sufficient, more reaction substances are provided for the secondary hydration of the fly ash, the silica fume and the nano silicon dioxide, and if the doping proportion between the fly ash, the silica fume and the nano silicon dioxide is not controlled, the reactants of the secondary hydration of the fly ash, the silica fume and the nano silicon dioxide can be too much, so that too much gel is generated by the secondary hydration, the internal pores of the high-water-permeability concrete are reduced, and the water permeability of the high-water-permeability concrete is influenced.
Preferably, the calcium sulfate whisker is modified by the following method:
mixing sodium hexametaphosphate, an ethanol solution and calcium sulfate whiskers at the temperature of 45-55 ℃, stirring for 25-35min, filtering, washing, and drying at the temperature of 40-45 ℃ to obtain modified calcium sulfate whiskers, wherein the weight ratio of the sodium hexametaphosphate to the ethanol solution to the calcium sulfate whiskers is 1: (45-55): (30-36).
By adopting the technical scheme, because the calcium sulfate whisker is hydrophilic and oleophobic and has strong polarity, the calcium sulfate whisker is relatively unstable and is extremely easy to decompose, so that the surface of the calcium sulfate whisker needs to be modified to reduce the surface energy of the calcium sulfate whisker, inhibit the hydrophilicity of the calcium sulfate whisker and enhance the compatibility of the calcium sulfate whisker and other substances; when the calcium sulfate whisker is modified by using the sodium hexametaphosphate, the sodium hexametaphosphate reacts with the calcium sulfate whisker to generate calcium polyphosphate, and the insoluble matter is attached to the surface of the calcium sulfate whisker to isolate an aqueous solution, so that the calcium sulfate whisker has certain hydrophobicity, thereby improving the stability of the calcium sulfate whisker, enabling the calcium sulfate whisker to stably generate hydration and improving the compressive strength of concrete.
Preferably, the industrial solid waste further comprises 4-5.2 parts of iron tailing sand by weight.
By adopting the technical scheme, as the iron tailing sand contains more silicon, iron and aluminum and is similar to most cementing materials in composition, the iron tailing sand can be used as a high-water-permeability concrete admixture, and a certain amount of iron tailing sand is doped, so that the workability of the high-water-permeability concrete can be improved, the hydration effect of cement can be improved, and the generation of a cement hydration product calcium hydroxide can be increased, so that the secondary hydration effect of nano silicon dioxide, fly ash and silica fume is improved, the gel amount of the product of the secondary hydration effect is increased, the micro-filling capacity between coarse aggregate binding surfaces is improved, and the compressive strength of the high-water-permeability concrete is improved; if excessive iron tailing sand is doped, the gel amount generated by secondary hydration of silicon oxide, fly ash and silica fume is excessive, the water permeability of the high-water-permeability concrete is affected, and meanwhile, the tensile strength of the high-water-permeability concrete is reduced by excessive iron tailing sand, so that the high-water-permeability concrete is brittle.
Preferably, the concrete further comprises 1-1.3 parts of silicone-acrylic emulsion by weight.
By adopting the technical scheme, the particle surfaces of the silicone-acrylic emulsion have polarity, so that the surfaces of the cement particles also have polarity after being adsorbed on the surfaces of the cement particles, and a certain amount of the silicone-acrylic emulsion is doped to enhance the dispersibility of the cement particles, so that the fluidity of the cement is enhanced, the capability of filling larger pores with the cement is improved, and the compressive strength of the concrete with high water permeability is improved; if the amount of the silicone-acrylic emulsion added is too high, the effect of the silicone-acrylic emulsion on improving the fluidity of cement is reduced because the repulsion of the same polarity on the surface of cement particles is increased, thereby reducing the compressive strength of the concrete with high water permeability.
The second purpose of the application is to provide a preparation method of the concrete with high water permeability, which is to stir all the components at the rotating speed of 100-120r/min so as to uniformly mix the components.
By adopting the technical scheme, all the components are stirred and uniformly mixed in the rotating speed range, so that the components can be fully contacted, the dispersity of the components in concrete is improved, the prepared concrete has higher compressive strength, and the high water permeability of the concrete is kept.
In summary, the present application includes at least one of the following beneficial technical effects:
1. as the nano silicon dioxide, the silica fume, the fly ash and the calcium sulfate whiskers are doped into the concrete, the effect of improving the compressive strength of the concrete is achieved while the high water permeability of the concrete is not influenced;
2. according to the application, the triethanolamine is doped into the concrete, so that the hydration effect of cement in the concrete is promoted, the secondary hydration effect of the nano silicon dioxide, the silica fume and the fly ash is further promoted, and the effect of improving the compressive strength of the pervious concrete is achieved while the high water permeability of the concrete is not influenced;
3. because this application adopts modified calcium sulfate whisker for calcium sulfate whisker's stability improves, makes its ability stable carry out hydration, has obtained when not influencing the high water permeability performance of concrete, has improved the compressive strength's of concrete effect.
Detailed Description
The present application will be described in further detail with reference to examples.
In the following examples and comparative examples:
the cement is purchased from P.O42.5 grade cement produced by Huaxin cement GmbH, and the physical properties are shown in Table 1;
TABLE 1 physical and mechanical Properties of the cements
The coarse aggregate is selected from pebble, purchased from Huangshi Qinglong stone crushing plant, with particle diameter of 5-10mm and apparent density of 2700kg/m3Bulk density 1450kg/m3；
Fly ash: second order, bulk density 580kg/m3(ii) a Silica fume: average particle diameter of 0.1-0.3 μm and bulk density of 300kg/m3(ii) a The iron tailings are purchased from Ling Xiang ore dressing plants in yellow stone city, and the bulk density is 2080kg/m3；
Calcium sulfate whisker: the average particle size is 100-200nm, and the length-diameter ratio is 100;
nano silicon dioxide: nanometer silicon dioxide with purity of 99.5% and particle size of (30 +/-5) nm, produced by Shanghai Mielin Biochemical technology Limited; the slag is purchased from the ore industry Co., Ltd of the same Rui of yellow Stone city;
triethanolamine was purchased from Jinan, Kingchi chemical Co., Ltd;
the polycarboxylate superplasticizer is purchased from a high-efficiency water reducing agent produced by a certain concrete company of Wuhan, the solid content is 42 percent, and the actually measured water reducing rate is 40 percent;
the chemical compositions of cement and industrial solid waste are shown in table 2:
TABLE 2 chemical composition of cement and industrial solid waste (%)
| Item | CaO | SiO2 | Fe2O3 | SO3 | Al2O3 | K2O | MgO |
| Cement | 75.57 | 10.35 | 6.07 | 3.51 | 1.79 | 1.08 | 0.59 |
| Silica fume | 1.78 | 93.39 | 0.25 | 1.57 | 0.04 | 2.03 | 0.86 |
| Fly ash | 67.50 | 13.08 | 10.16 | 2.48 | 3.62 | 1.28 | 0.94 |
| Iron tailings sand | 0.48 | 76.85 | 15.4 | - | 5.92 | 1.00 | 1.20 |
Example 1
A preparation method of high-water-permeability concrete comprises the following steps: 1.8kg of cement, 0.7kg of slag, 0.42kg of silica fume, 0.52kg of fly ash, 0.8kg of water, 7.3kg of pebble, 0.08kg of triethanolamine, 0.176kg of calcium sulfate whisker, 0.1kg of nano silicon dioxide and 0.05kg of polycarboxylic acid high-efficiency water reducing agent are stirred at the rotating speed of 100r/min, so that the components are uniformly mixed to obtain the concrete with high water permeability.
Example 2
A preparation method of high-water-permeability concrete comprises the following steps: 2.8kg of cement, 0.5kg of slag, 0.5kg of silica fume, 0.4kg of fly ash, 1.04kg of water, 6.5kg of stones, 0.104kg of triethanolamine, 0.1kg of calcium sulfate whiskers, 0.13kg of nano silicon dioxide and 0.02kg of polycarboxylic acid high-efficiency water reducing agent are stirred at the rotating speed of 100r/min, so that the components are uniformly mixed, and the high-permeability concrete is obtained.
Example 3
A preparation method of high-water-permeability concrete comprises the following steps: 2.3kg of cement, 0.6kg of slag, 0.46kg of silica fume, 0.46kg of fly ash, 0.92kg of water, 6.9kg of pebble, 0.092kg of triethanolamine, 0.138kg of calcium sulfate whisker, 0.115kg of nano silicon dioxide and 0.035kg of polycarboxylic acid high-efficiency water reducing agent are stirred at the rotating speed of 110r/min, so that the components are uniformly mixed to obtain the concrete with high water permeability.
Example 4
A preparation method of high-water-permeability concrete comprises the following steps: 1.875kg of cement, 0.625kg of slag, 0.445kg of silica fume, 0.495kg of fly ash, 0.85kg of water, 7.1kg of stones, 0.085kg of triethanolamine, 0.156kg of calcium sulfate whiskers, 0.105kg of nano silicon dioxide and 0.045kg of polycarboxylic acid high-efficiency water reducing agent are stirred at the rotating speed of 120r/min, so that the components are uniformly mixed to obtain the concrete with high water permeability.
Example 5
A preparation method of high-water-permeability concrete comprises the following steps: 2.725kg of cement, 0.575kg of slag, 0.475kg of silica fume, 0.425kg of fly ash, 0.99kg of water, 6.7kg of pebble, 0.099kg of triethanolamine, 0.12kg of calcium sulfate whisker, 0.125kg of nano silicon dioxide and 0.025kg of polycarboxylic acid high-efficiency water reducing agent are stirred at the rotating speed of 120r/min, so that the components are uniformly mixed to obtain the concrete with high water permeability.
Example 6
The difference from example 3 is that: the weight ratio of the fly ash to the nano silicon dioxide is 4:1, wherein the weight ratio of the nano silicon dioxide is 0.115kg, and the weight ratio of the fly ash to the nano silicon dioxide is 0.46 kg.
Example 7
The difference from example 3 is that: the weight ratio of the fly ash to the nano silicon dioxide is 4.3:1, wherein the weight ratio of the nano silicon dioxide is 0.115kg, and the weight ratio of the fly ash to the nano silicon dioxide is 0.4945 kg.
Example 8
The difference from example 3 is that: the weight ratio of the calcium sulfate whisker to the cement to the water is 1: 16: 6, wherein the calcium sulfate whisker is 0.138kg, the cement is 2.208kg, and the water is 0.828 kg.
Example 9
The difference from example 3 is that: the weight ratio of the calcium sulfate whisker to the cement to the water is 1: 17.2: 7.2, wherein the calcium sulfate whisker accounts for 0.138kg, the cement accounts for 2.3736kg, and the water accounts for 0.9936 kg.
Example 10
The difference from example 3 is that: the weight ratio of the calcium sulfate whisker to the nano silicon dioxide is 1: 1, wherein the nano silicon dioxide is 0.115kg, and the calcium sulfate whisker is 0.115 kg.
Example 11
The difference from example 3 is that: the weight ratio of the calcium sulfate whiskers to the nano silicon dioxide is 1.46: 1, wherein the nano silicon dioxide is 0.115kg, and the calcium sulfate whisker is 0.1679 kg.
Example 12
The difference from example 3 is that: the calcium sulfate crystal whisker is modified;
the preparation method of the modified calcium sulfate whisker comprises the following steps:
mixing 10g of sodium hexametaphosphate, 450g of ethanol solution and 300g of calcium sulfate whisker at the temperature of 45 ℃, stirring for 25min, filtering, washing, and drying at the temperature of 40 ℃ to obtain the modified calcium sulfate whisker.
Example 13
The difference from example 3 is that: the calcium sulfate crystal whisker is modified;
the preparation method of the modified calcium sulfate whisker comprises the following steps:
mixing 10g of sodium hexametaphosphate, 550g of ethanol solution and 360g of calcium sulfate whisker at the temperature of 55 ℃, stirring for 35min, filtering, washing, and drying at the temperature of 45 ℃ to obtain the modified calcium sulfate whisker.
Example 14
The difference from example 3 is that: the industrial solid waste also comprises 0.04kg of iron tailings.
Example 15
The difference from example 3 is that: the industrial solid waste also comprises 0.052kg of iron tailings.
Example 16
The difference from example 3 is that: the concrete also comprises 0.01kg of silicone-acrylic emulsion.
Example 17
The difference from example 3 is that: the concrete also comprises 1.3kg of silicone-acrylic emulsion.
Comparative example 1
The difference from example 3 is that: 0.4kg of silica fume, 0.38kg of fly ash, 0.08kg of calcium sulfate whisker and 0.08kg of nano silicon dioxide.
Comparative example 2
The difference from example 3 is that: 0.52kg of silica fume, 0.54kg of fly ash, 0.196kg of calcium sulfate whisker and 0.15kg of nano silicon dioxide.
Comparative example 3
The difference from example 15 is that: the industrial solid waste also comprises 0.03kg of iron tailings.
Comparative example 4
The difference from example 15 is that: the industrial solid waste also included 0.062kg of iron tailings.
Comparative example 5
The difference from example 17 is that: the concrete also comprises 0.008kg of silicone-acrylic emulsion.
Comparative example 6
The difference from example 17 is that: the concrete also comprises 1.7kg of silicone-acrylic emulsion.
Performance detection
The concrete prepared in examples 1 to 17 and comparative examples 1 to 6 were tested for mechanical properties and water permeability, and the test results are shown in Table 3:
the mechanical property is detected according to GB/T50081-2002 'Standard test method for mechanical property of ordinary concrete' for detecting the 28d compressive strength (MPa) of concrete; detecting the flexural strength of the concrete 29d according to GB/T50081-2002 standard of Experimental methods for mechanical properties of ordinary concrete; detecting porosity (%) according to CJJ/T253-2016 technical Specification for recycled aggregate pervious concrete application;
water permeability the water permeability coefficient (mm/s) of concrete was measured according to GB/T25993-2010 Standard Water permeable Cement concrete Water permeability coefficient test apparatus Specification.
TABLE 3 Experimental test data for each example and comparative example maintenance 28d
As can be seen from Table 3, the porosity of examples 1-5 is less than that of comparative examples 1-2, the compressive strength and the flexural strength of examples 1-5 are both greater than those of comparative examples 1-2, and the water permeability coefficient of examples 1-5 is slightly different from that of comparative examples 1-2, which indicates that the concrete prepared according to the formulation of examples 1-5 has less porosity, higher degree of compaction, and significantly higher mechanical properties than that of comparative examples 1-2, and does not affect the water permeability of the concrete, so that the concrete still maintains higher water permeability; meanwhile, in examples 1 to 5, the numerical values of the compressive strength and the flexural strength of example 3 are the highest, and the numerical value of the porosity is the lowest, which shows that when substances such as triethanolamine, calcium sulfate whiskers, nano-silica, fly ash, silica fume and the like are added according to the formula proportion in example 3, the porosity of the concrete can be obviously reduced, and the compaction degree of the pervious concrete is improved, so that the compressive strength of the pervious concrete is improved, and high water permeability can be maintained.
As can be seen from Table 3, the compressive strength of the concrete in examples 6-7 is greater than that of the concrete in example 3, the porosity of the concrete in examples 6-7 is less than that of the concrete in example 3, the flexural strength of the concrete in examples 6-7 is slightly higher than that of the concrete in example 3, and the water permeability coefficient of the concrete in examples 6-7 is almost the same as that of the concrete in example 3, which indicates that the nano silica and the fly ash are mixed into the concrete according to the mixture ratio of the concrete in examples 6-7, so that the porosity of the pervious concrete can be reduced, the compaction degree of the pervious concrete can be improved, and the compressive strength of the pervious concrete can be improved.
As can be seen from Table 3, the compressive strength of the concrete in examples 8-9 is greater than that of the concrete in example 3, the porosity of the concrete in examples 8-9 is less than that of the concrete in example 3, and the water permeability coefficient of the concrete in examples 8-9 is not much different from that of the concrete in example 3, which shows that the porosity of the concrete can be reduced and the compaction degree of the concrete can be improved without affecting the high water permeability of the concrete by adding water, calcium sulfate whiskers and cement into the concrete according to the proportion of the concrete in examples 8-9, thereby improving the compressive strength of the concrete.
As can be seen from Table 3, the compressive strength of the examples 10-11 is greater than that of the example 3, the porosity of the examples 10-11 is less than that of the example 3, and the water permeability coefficient of the examples 10-11 is not much different from that of the example 3, which shows that the calcium sulfate whiskers and the nano-silica are mixed into the concrete according to the proportion of the examples 10-11, so that the porosity of the pervious concrete can be reduced, the compaction degree of the pervious concrete can be improved, and the compressive strength of the pervious concrete can be improved without affecting the high water permeability of the concrete.
As can be seen from Table 3, the compressive strength and the flexural strength of the concrete in the examples 12 to 13 are higher than those in the example 3, the porosity of the concrete in the examples 12 to 13 is lower than that in the example 3, and the difference between the water permeability coefficient of the concrete in the examples 12 to 13 and that in the example 3 is not great, which shows that the porosity of the concrete can be reduced and the compaction degree of the concrete can be improved without affecting the high water permeability of the concrete by using the modified calcium sulfate whiskers, thereby improving the compressive strength of the concrete.
As can be seen from Table 3, the compressive strength of examples 14-15 is greater than that of example 3, the porosity of examples 14-15 is less than that of example 3, and the water permeability coefficient of examples 14-15 is not much different from that of example 3, which shows that the incorporation of iron tailings sand into concrete according to examples 14-15 can reduce the porosity of concrete and increase the compaction degree of concrete without affecting the high water permeability of concrete, thereby improving the compressive strength of concrete.
As can be seen from Table 3, the compressive strength of the concrete in examples 16-17 is greater than that of the concrete in example 3, the porosity of the concrete in examples 16-17 is less than that of the concrete in example 3, and the water permeability coefficient of the concrete in examples 16-17 is not much different from that of the concrete in example 3, which shows that the concrete in examples 16-17 can be blended with the silicone emulsion to reduce the porosity of the concrete and increase the degree of compaction of the concrete without affecting the water permeability of the concrete, thereby improving the compressive strength of the concrete.
As can be seen from Table 3, comparing comparative examples 3 and 4 with example 15, the porosity of example 15 is smaller than that of comparative examples 3-4, the compressive strength and the flexural strength of example 15 are greater than those of comparative examples 3-4, and the water permeability coefficient of example 15 is not much different from that of comparative examples 3-4, which shows that when the amount of the iron tailing sand added is too small or too large, the effect of reducing the porosity of the pervious concrete and improving the compressive strength of the pervious concrete is not obvious.
As can be seen from Table 3, comparing comparative examples 5-6 with example 17, the porosity of example 17 is smaller than that of comparative examples 5-6, the compressive strength and the flexural strength of example 17 are greater than those of comparative examples 5-6, and the water permeability coefficient of example 17 is not much different from that of comparative examples 5-6, which indicates that when the amount of the silicone-acrylic emulsion is too small or too large, the effect of reducing the porosity of the pervious concrete and improving the compressive strength of the pervious concrete is not obvious.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A high water permeability concrete, characterized in that: the concrete comprises the following components in parts by weight: 350 parts of a cementing material 230-; wherein the cementing material comprises 180-280 parts of cement and 50-70 parts of slag; the industrial solid waste comprises 42-50 parts of silica fume and 40-52 parts of fly ash.
2. The concrete of claim 1, wherein: the concrete comprises the following components in parts by weight: 335 parts of a cementing material 245-; wherein the cementing material comprises 187.5 to 272.5 parts of cement and 57.5 to 62.5 parts of slag; the industrial solid waste comprises 44.5-47.5 parts of silica fume and 42.5-49.5 parts of fly ash.
3. The concrete of claim 1, wherein: the weight ratio of the fly ash to the nano silicon dioxide is (4-4.3) to 1.
4. The concrete of claim 1, wherein: the weight ratio of the calcium sulfate whisker to the cement to the water is 1: (16-17.2): (6-7.2).
5. The concrete of claim 1, wherein: the weight ratio of the calcium sulfate whisker to the nano silicon dioxide is (1-1.46): 1.
6. the concrete of claim 1, wherein: the calcium sulfate whisker is modified by the following method:
mixing sodium hexametaphosphate, an ethanol solution and calcium sulfate whiskers at the temperature of 45-55 ℃, stirring for 25-35min, filtering, washing, and drying at the temperature of 40-45 ℃ to obtain modified calcium sulfate whiskers, wherein the weight ratio of the sodium hexametaphosphate to the ethanol solution to the calcium sulfate whiskers is 1: (45-55): (30-36).
7. The concrete of claim 1, wherein: the industrial solid waste also comprises 4-5.2 parts of iron tailing sand by weight.
8. The concrete of claim 1, wherein: the concrete also comprises 1-1.3 parts of silicone-acrylic emulsion according to parts by weight.
9. The method for preparing concrete with high water permeability according to any one of claims 1 to 8, wherein: all the components are stirred at the rotating speed of 100-120r/min, so that the components are uniformly mixed.
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| CN114315268A (en) * | 2021-12-17 | 2022-04-12 | 杭州鼎昇建材有限公司 | High-strength emergency concrete and preparation method thereof |
| CN115057670A (en) * | 2022-03-30 | 2022-09-16 | 上海二十冶建设有限公司 | Fast-hardening high-ductility inorganic sealing mortar |
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| CN115636638A (en) * | 2022-10-09 | 2023-01-24 | 湖北云海混凝土有限公司 | High-strength pervious concrete and preparation method thereof |
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