CN111196704A - Concrete for prefabricated part and preparation method thereof - Google Patents
Concrete for prefabricated part and preparation method thereof Download PDFInfo
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- CN111196704A CN111196704A CN202010063166.3A CN202010063166A CN111196704A CN 111196704 A CN111196704 A CN 111196704A CN 202010063166 A CN202010063166 A CN 202010063166A CN 111196704 A CN111196704 A CN 111196704A
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses concrete for a prefabricated part and a preparation method thereof, relates to the technical field of concrete, and solves the problem that the prefabricated part is damaged due to the fact that harmful substances such as acid and alkali ions are easy to permeate inwards through tiny gaps and cracks of the concrete, and the volume of a reinforcing steel bar is expanded. The concrete for the prefabricated part comprises the following components in parts by weight: 200 portions of Portland cement; 170 portions of water and 180 portions of water; 720 portions of middlings and 760 portions of middlings; 1020 and 1050 parts of gravel; 70-80 parts of fly ash; 190 portions of mineral powder 170-; 3-5 parts of a water reducing agent; 2-3 parts of a retarder; 4-8 parts of an anti-permeability agent; 6-10 parts of sodium methylsilicate; 5-9 parts of triethoxysilane; 15-35 parts of organic silicon water-soluble resin. The concrete for the prefabricated part has excellent chemical corrosion resistance, has good protection effect on the steel bars in the prefabricated part, and has good integral application effect.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to concrete for a prefabricated part and a preparation method thereof.
Background
The concrete is cement concrete which is prepared by mixing cement as a cementing material, sand and stone as aggregates, water, an additive and an admixture according to a certain proportion and stirring, and is also called ordinary concrete, and is widely applied to civil engineering. The precast concrete members are building members, including beams, plates, columns, building finishing accessories and the like, which are manufactured in a factory in advance by using concrete as a basic material.
The Chinese invention patent application with the publication number of CN108821670A discloses a production process of active powder concrete and a pouring prefabricated part thereof, wherein the active powder concrete comprises the following components in mass percentage based on the unit cubic concrete: 660-710 kg of cement, 160-200 kg of silica fume, 150-180 kg of fly ash, 1100-1160 kg of quartz sand, 100-120 kg of steel fiber, 18-22 kg of water reducing agent and 180-200 kg of water; the quartz sand is quartz sand with three particle sizes, which are respectively as follows: the quartz sand comprises ultrafine quartz sand with the grain diameter of 0.08-0.16 mm, fine quartz sand with the grain diameter of 0.17-0.315 mm and medium quartz sand with the grain diameter of 0.316-0.63 mm, wherein the mass ratio of the ultrafine quartz sand to the fine quartz sand to the medium quartz sand is 15-25:65-75: 5-15.
In the above application, quartz sand with three particle sizes (the whole particle size is finer) is adopted, the grading of the quartz sand is more uniform and reasonable, particles of different materials can be better wrapped and embedded mutually, the compactness of aggregate is improved, and then the doping amount of steel fibers is optimized, so that the prepared active powder concrete has better fluidity, and the active powder concrete pouring prefabricated part has better breaking strength.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the concrete for the prefabricated part, which is used for solving the technical problems, has excellent chemical corrosion resistance, has good protection effect on the steel bars in the prefabricated part and good overall application effect.
In order to achieve the first purpose, the invention provides the following technical scheme:
the concrete for the prefabricated part comprises the following components in parts by weight:
200 portions of Portland cement;
170 portions of water and 180 portions of water;
720 portions of middlings and 760 portions of middlings;
1020 and 1050 parts of gravel;
70-80 parts of fly ash;
190 portions of mineral powder 170-;
3-5 parts of a water reducing agent;
2-3 parts of a retarder;
4-8 parts of an anti-permeability agent;
6-10 parts of sodium methylsilicate;
5-9 parts of triethoxysilane;
15-35 parts of organic silicon water-soluble resin.
By adopting the technical scheme, the fly ash is an artificial pozzolanic mixed material, has little or no hydraulic gelation property, and chemically reacts with calcium hydroxide or other alkaline earth metal hydroxides to generate a compound with the hydraulic gelation property, so that the concrete for the prefabricated part keeps good and stable structural strength. The mineral powder can effectively improve the compressive strength of the concrete for the prefabricated part, reduce the cost of the concrete for the prefabricated part, inhibit alkali aggregate reaction, reduce hydration heat, reduce early temperature cracks of a concrete structure for the prefabricated part, improve the compactness of the concrete for the prefabricated part and have obvious effects on improving the anti-seepage and anti-erosion capabilities. The water reducing agent can reduce the unit water consumption, improve the fluidity of the concrete for the prefabricated part and improve the compactness of the concrete for the prefabricated part; the retarder is beneficial to prolonging the setting time of the concrete for the prefabricated part; the anti-permeability agent enables the concrete for the prefabricated part to have good anti-permeability performance; the concrete for the prefabricated member can keep high quality as a whole.
The sodium methyl silicate, the triethoxysilane and the organic silicon water-soluble resin can form a novel material by utilizing the hydration heat of the portland cement, and a plurality of colloidal suspended particles are formed in the cement hardening process to generate non-water-passing double salt, change the original glue-to-air ratio of the set cement, fill concrete pores and capillary pores, promote the compaction effect, and further improve the integral strength and impermeability of the concrete for the prefabricated part; meanwhile, the sodium methyl silicate, the triethoxysilane and the organic silicon water-soluble resin are compounded for use, water molecules can be effectively prevented from permeating, the strength of the concrete is obviously improved, the volume shrinkage of the concrete is reduced, the communication of capillary pipelines is cut off, the porosity inside the concrete for the prefabricated part is reduced, and the compactness and the impermeability are improved.
More preferably, 8-14 parts by weight of functional auxiliary agents are also added into the concrete for the prefabricated part, the functional auxiliary agents are composed of brucite fibers and silica powder, and the weight part ratio of the brucite fibers to the silica powder is 1: (3-5).
By adopting the technical scheme, the brucite fiber is used as a reinforcing material and an additive, and has good mechanical property, alkali resistance, water dispersion property and environmental tolerance, so that the obtained concrete for the prefabricated part has good corrosion resistance; the silica powder can obviously improve the compactness of the concrete for the prefabricated part, improve the anti-permeation and anti-carbonization capabilities of the concrete, and prolong the service life of a reinforcing steel bar in the prefabricated part; meanwhile, when the functional assistant consisting of the brucite fibers and the silicon powder is used, the brucite fibers and the silicon powder can play a good role in compounding and synergism, so that the harmful medium corrosion resistance of the concrete for the prefabricated part can be greatly improved, and the overall durability is more excellent.
More preferably, 2-3 parts by weight of calcium nitrite is also added into the components of the concrete for the prefabricated part.
By adopting the technical scheme, the calcium nitrite is a good corrosion inhibitor, and can stabilize the passive film on the surface of the steel bar by improving the critical value of chloride ion corrosion, so that the whole prefabricated part prepared by the concrete for the prefabricated part has good chemical corrosion resistance, and the durability of the whole concrete for the prefabricated part is greatly improved.
More preferably, the concrete for the prefabricated part also comprises 6 to 10 parts by weight of neoprene latex.
By adopting the technical scheme, when the silicate cement is hydrated, the neoprene latex is dehydrated to be gelled, uniform polymer adhesive films which are connected with each other are formed in the latex cement mortar, the adhesive films have better elasticity and can bear certain deformation, the internal stress of the concrete for the prefabricated part is reduced, the generation of micro cracks is reduced, the integral compactness of the concrete for the prefabricated part is further improved, and a good protection effect is further realized on a reinforcing steel bar in the prefabricated part.
Preferably, the water reducing agent is any one of sodium lignosulfonate, sodium sulfite, tannin and sugar calcium.
By adopting the technical scheme, the sodium lignosulfonate, the sodium sulfite, the tannin and the calcium saccharate are good water reducing agents, have good dispersing effects on raw materials of each component of the concrete for the prefabricated part, can reduce the unit water consumption, improve the fluidity of the concrete for the prefabricated part, improve the compactness of the concrete for the prefabricated part, further reduce the bleeding rate of the concrete for the prefabricated part, have good stability and keep good and stable structural strength in the application process.
Preferably, the retarder is any one of sodium tripolyphosphate, sodium gluconate, sodium citrate and sodium lignosulfonate.
By adopting the technical scheme, the sodium tripolyphosphate, the sodium gluconate, the sodium citrate and the sodium lignosulfonate are good retarders which can generate unstable complexes in the concrete for the prefabricated part to generate a retarding effect, and the unstable complexes are automatically decomposed along with the progress of a hydration process, so that the hydration continues to be normally carried out, and the later hydration of the cement is not influenced.
More preferably, the anti-permeability agent is any one of triethanolamine, calcium formate, calcium chloride and urea.
By adopting the technical scheme, the triethanolamine, the calcium formate, the calcium chloride and the urea are good anti-permeability agents, so that the concrete for the prefabricated part has good anti-permeability capability on the premise of keeping good structural strength, and further, the concrete for the prefabricated part can keep good and stable interface bonding strength between the concrete waste and other component raw materials in the using process, and the stability of the concrete for the prefabricated part is enhanced.
The invention also aims to provide a preparation method of the concrete for the prefabricated part, and the concrete for the prefabricated part prepared by the method has excellent chemical corrosion resistance, good protection effect on reinforcing steel bars in the prefabricated part and good integral application effect.
In order to achieve the second purpose, the invention provides the following technical scheme, which comprises the following steps:
step one, stirring and drying the medium sand and the broken stone in corresponding weight parts in a drying barrel respectively, controlling the temperature at 80-120 ℃, the time at 40-60 min and the stirring speed at 300-500 rpm, and screening and removing impurities to obtain dried medium sand and broken stone;
drying, stirring and mixing the fly ash, the portland cement and the mineral powder in corresponding parts by weight, controlling the temperature to be 80-120 ℃, the time to be 30-40min, and the stirring speed to be 600-900rpm, adding the dried medium sand and the crushed stone after cooling, and continuously stirring and mixing for 10-20min to obtain a mixture;
step three, uniformly mixing water, sodium methyl silicate, triethoxysilane and organic silicon water-soluble resin in corresponding parts by weight in a stirring barrel for 10-20min at the stirring speed of 400-600rpm to obtain a mixed solution;
and step four, pouring the mixture into the mixed solution for multiple times, continuously stirring at the stirring speed of 800 plus 1200rpm, wherein the stirring time of each charging is 10-15min, adding the water reducing agent, the retarder and the anti-permeability agent in corresponding parts by weight after the charging is finished, and continuously stirring for 5-10min to obtain the concrete for the prefabricated part.
Through adopting above-mentioned technical scheme, carry out stoving stirring treatment with medium sand and rubble, can avoid it each other because moisture and adhesion are in the same place, and can drop the soft part on medium sand and rubble surface to get rid of through the screening, obtain medium sand and rubble of good stable quality, and then make the concrete for the prefabricated component who obtains have higher closely knit degree and good anti-permeability, and have good structural strength after the solidification shaping. Meanwhile, the process for preparing the concrete for the prefabricated part is simple to operate, and the components can be quickly and uniformly mixed, so that the concrete for the prefabricated part has high production efficiency, and the overall quality can be guaranteed.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the sodium methyl silicate, the triethoxysilane and the organic silicon water-soluble resin can form a novel material by utilizing the hydration heat of the portland cement, and a plurality of colloidal suspended particles are formed in the cement hardening process to generate non-water-passing double salt, change the original glue-to-air ratio of the set cement, fill concrete pores and capillary pores, promote the compaction effect, and further improve the integral strength and impermeability of the concrete for the prefabricated part;
(2) when the functional auxiliary agent consisting of brucite fibers and silicon powder is added, the brucite fibers and the silicon powder can play a good role in compounding and synergism, so that the harmful medium corrosion resistance of the concrete for the prefabricated part can be greatly improved, and the integral durability is more excellent;
(3) when the silicate cement is hydrated, the neoprene latex is dehydrated to be gelled, uniform polymer adhesive films which are mutually connected are formed in the latex cement mortar, and the adhesive films have better elasticity and can bear certain deformation, so that the internal stress of the concrete for the prefabricated part is reduced, the generation of micro cracks is reduced, and the integral compactness of the concrete for the prefabricated part is further improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: the concrete for the prefabricated part comprises the following components in parts by weight as shown in Table 1, and is prepared by the following steps:
step one, stirring and drying the medium sand and the broken stone in corresponding parts by weight in a drying barrel respectively, controlling the temperature at 110 ℃, the time at 50min and the stirring speed at 400rpm, and screening and removing impurities to obtain dried medium sand and broken stone;
step two, drying, stirring and mixing the fly ash, the portland cement and the mineral powder in corresponding parts by weight, controlling the temperature at 100 ℃, the time at 35min and the stirring speed at 750rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 15min to obtain a mixture;
step three, uniformly mixing water, sodium methyl silicate, triethoxysilane and organic silicon water-soluble resin in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution;
and step four, pouring the mixture into the mixed solution for three times according to the equal mass, continuously stirring at the stirring speed of 1000rpm, stirring for 12.5min each time, adding the corresponding parts by weight of sodium lignosulfonate, sodium tripolyphosphate and triethanolamine after the materials are added, and continuously stirring for 7.5min to obtain the concrete for the prefabricated part.
Note: the organic silicon water-soluble resin in the third step is purchased from the company Limited and has the mark of SMH-30.
Example 2: a concrete for prefabricated parts, which is different from example 1 in that it is specifically prepared by the following steps:
step one, stirring and drying the medium sand and the broken stone in corresponding parts by weight in a drying barrel respectively, controlling the temperature at 80 ℃, the time at 60min and the stirring speed at 300rpm, and screening and removing impurities to obtain dried medium sand and broken stone;
step two, drying, stirring and mixing the fly ash, the portland cement and the mineral powder in corresponding parts by weight, controlling the temperature at 80 ℃, the time at 40min and the stirring speed at 600rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 20min to obtain a mixture;
step three, uniformly mixing water, sodium methyl silicate, triethoxysilane and organic silicon water-soluble resin in corresponding parts by weight in a stirring barrel for 10min at a stirring speed of 600rpm to obtain a mixed solution;
and step four, pouring the mixture into the mixed solution for three times according to the equal mass, continuously stirring at the stirring speed of 800rpm, stirring for 15min each time, adding the corresponding parts by weight of sodium lignosulfonate, sodium tripolyphosphate and triethanolamine after the materials are added, and continuously stirring for 5min to obtain the concrete for the prefabricated part.
Example 3: a concrete for prefabricated parts, which is different from example 1 in that it is specifically prepared by the following steps:
step one, stirring and drying the medium sand and the crushed stone in corresponding weight parts in a drying barrel respectively, controlling the temperature at 120 ℃, the time at 40min and the stirring speed at 500rpm, and screening and removing impurities to obtain dried medium sand and crushed stone;
step two, drying, stirring and mixing the fly ash, the portland cement and the mineral powder in corresponding parts by weight, controlling the temperature at 120 ℃, the time at 30min and the stirring speed at 900rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 10min to obtain a mixture;
step three, uniformly mixing water, sodium methyl silicate, triethoxysilane and organic silicon water-soluble resin in corresponding parts by weight in a stirring barrel for 20min at a stirring speed of 400rpm to obtain a mixed solution;
and step four, pouring the mixture into the mixed solution for three times according to the equal mass, continuously stirring at the stirring speed of 1200rpm, stirring for 10min each time, adding the corresponding parts by weight of sodium lignosulfonate, sodium tripolyphosphate and triethanolamine after the materials are added, and continuously stirring for 10min to obtain the concrete for the prefabricated part.
Examples 4 to 5: a concrete for prefabricated parts, which is different from example 1 in that each component and the corresponding parts by weight thereof are shown in Table 1.
TABLE 1 Components and parts by weight of examples 1-5
Example 6: a concrete for a prefabricated part, which is different from the concrete in example 1 in that sodium lignosulfonate and the like in the fourth step are replaced by sodium sulfite.
Example 7: a precast concrete, which is different from the concrete of example 1 in that the mass of sodium lignin sulfonate and the like in the fourth step is replaced by tannin.
Example 8: a precast concrete differs from that of example 1 in that the mass of sodium lignosulfonate, etc., in the fourth step is replaced with calcium saccharate.
Example 9: the concrete for the prefabricated part is different from the concrete in the embodiment 1 in that sodium tripolyphosphate and the like in the step four are replaced by sodium gluconate in mass.
Example 10: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that sodium tripolyphosphate and the like in the fourth step are replaced by sodium citrate.
Example 11: the concrete for the prefabricated part is different from the concrete in the embodiment 1 in that sodium tripolyphosphate and the like in the step four are replaced by sodium lignosulfonate in mass.
Example 12: a precast concrete differs from that of example 1 in that the amount of triethanolamine and the like in step four is replaced with calcium formate.
Example 13: a precast concrete differs from that of example 1 in that the amount of triethanolamine and the like in step four is replaced with calcium chloride.
Example 14: a precast concrete differs from that of example 1 in that the amount of triethanolamine or the like in step four is replaced with urea.
Example 15: the concrete for the prefabricated part is different from the concrete in the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 11 parts of functional additives in parts by weight in a stirring barrel, wherein the functional additives are prepared from the following raw materials in parts by weight of 1: 4, the time is 15min, and the stirring speed is 500rpm, so as to obtain a mixed solution.
Example 16: the concrete for the prefabricated part is different from the concrete in the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 8 parts of functional additives in a stirring barrel in corresponding parts by weight, wherein the functional additives are prepared from the following raw materials in parts by weight of 1: 3, the time is 15min, and the stirring speed is 500rpm to obtain a mixed solution.
Example 17: the concrete for the prefabricated part is different from the concrete in the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 14 parts of functional assistant in parts by weight in a stirring barrel, wherein the functional assistant is prepared from the following raw materials in parts by weight of 1: 5, the time is 15min, and the stirring speed is 500rpm, so as to obtain a mixed solution.
Example 18: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 2.5 parts of calcium nitrite in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Example 19: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 2 parts of calcium nitrite in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Example 20: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 3 parts of calcium nitrite in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Example 21: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 8 parts of neoprene latex in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Example 22: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 6 parts of neoprene latex in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Example 23: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 10 parts of neoprene latex in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Comparative example 1: the concrete for the prefabricated part is different from the concrete for the embodiment 1 in that the step three is specifically set to uniformly mix water, sodium methyl silicate and organic silicon water-soluble resin in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Comparative example 2: the difference between the concrete for the prefabricated part and the concrete for the prefabricated part in the embodiment 1 is that the step three is specifically set to uniformly mix water, triethoxysilane and organic silicon water-soluble resin in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Comparative example 3: the difference between the concrete for the prefabricated part and the concrete for the prefabricated part in the embodiment 1 is that the step three is specifically set to uniformly mix water, sodium methyl silicate and triethoxysilane in corresponding parts by weight in a stirring barrel for 15min at a stirring speed of 500rpm to obtain a mixed solution.
Comparative example 4: a concrete for a precast member, which is different from that of example 1 in that the concrete of step three is specifically set so that the mixed solution contains only water.
Comparative example 5: the concrete for the prefabricated part is different from the concrete in example 15 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 11 parts of functional auxiliary agent in corresponding parts by weight in a stirring barrel, wherein the functional auxiliary agent is brucite fiber, the time is 15min, and the stirring speed is 500rpm, so that a mixed solution is obtained.
Comparative example 6: the concrete for the prefabricated part is different from the concrete in example 15 in that the step three is specifically set to uniformly mix water, sodium methyl silicate, triethoxysilane, organic silicon water-soluble resin and 11 parts of functional aid by weight in a stirring barrel, wherein the functional aid is silicon powder, the time is 15min, and the stirring speed is 500rpm to obtain a mixed solution.
Effect testing
Test samples: the concrete for precast members obtained in examples 1 to 23 was used as test samples 1 to 23, and the concrete for precast members obtained in comparative examples 1 to 6 was used as control samples 1 to 6.
The test method comprises the following steps: obtaining concrete test blocks for maintaining and forming the prefabricated parts by using the test samples 1-23 and the reference samples 1-6 according to GB/T50010-2002 concrete structure design specifications, then testing according to JTJ275-2000 ocean engineering concrete structure corrosion prevention technical specifications, and measuring the 48h water absorption rate of each concrete test block for the prefabricated parts; taking another concrete test block for the prefabricated part, embedding reinforcing steel bars with the same size and specification in the concrete test block, placing the concrete test block in an environment with the temperature of 25 ℃ and the humidity of 30%, spraying a composite corrosion solution (3.5% of sodium chloride, 10% of sodium sulfate, 2% of sulfuric acid with the pH value of 2 and 94.5% of pure water) on the surface of the concrete test block, continuously spraying for seven days, adopting a TYE-3000 computer full-automatic concrete press, taking the loading speed of 0.1MPa/s, and recording the compressive strength of the concrete test block for each prefabricated part.
And (3) test results: the test results of the test samples 1 to 23 and the control samples 1 to 6 are shown in Table 2. As can be seen from table 2, as a result of comparing the test results of the test samples 1 to 5 with the test results of the control samples 1 to 3, sodium methyl silicate, triethoxysilane, and silicone water-soluble resin can be compounded with each other, so that the water absorption of the concrete for prefabricated parts can be greatly reduced, and the overall structural strength of the concrete for prefabricated parts can be improved. The test results of the test samples 6-14 and the test sample 1 are compared, so that the water reducer, the retarder and the anti-permeability agent disclosed by the invention are all suitable for preparing the concrete for the prefabricated part, and the obtained concrete for the prefabricated part has good and stable water absorption rate and compressive strength. The test samples 15-17, the test samples 18-20 and the test samples 21-23 are respectively compared with the test results of the test sample 1, and the functional auxiliary agent consisting of brucite fiber and silicon powder and the calcium nitrite and the neoprene latex are added, so that the water absorption rate of the concrete for the prefabricated part can be greatly reduced, and the integral structural strength of the concrete for the prefabricated part is improved.
TABLE 2 test results of test samples 1-23 and control samples 1-6
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The concrete for the prefabricated part is characterized by comprising the following components in parts by weight:
200 portions of Portland cement;
170 portions of water and 180 portions of water;
720 portions of middlings and 760 portions of middlings;
1020 and 1050 parts of gravel;
70-80 parts of fly ash;
190 portions of mineral powder 170-;
3-5 parts of a water reducing agent;
2-3 parts of a retarder;
4-8 parts of an anti-permeability agent;
6-10 parts of sodium methylsilicate;
5-9 parts of triethoxysilane;
15-35 parts of organic silicon water-soluble resin.
2. The concrete for the prefabricated part according to claim 1, wherein the concrete for the prefabricated part further comprises 8-14 parts by weight of functional additives, the functional additives comprise brucite fibers and silica fume, and the weight part ratio of the brucite fibers to the silica fume is 1: (3-5).
3. The concrete for prefabricated parts according to claim 1, wherein 2 to 3 parts by weight of calcium nitrite is further added to the components of the concrete for prefabricated parts.
4. The precast member concrete according to claim 1, wherein 6 to 10 parts by weight of chloroprene latex is further added to the components of the precast member concrete.
5. The concrete for prefabricated parts according to claim 1, wherein said water reducing agent is any one selected from the group consisting of sodium lignosulfonate, sodium sulfite, tannin and calcium saccharate.
6. The concrete for prefabricated parts according to claim 1, wherein the retarder is any one of sodium tripolyphosphate, sodium gluconate, sodium citrate and sodium lignosulfonate.
7. The concrete for prefabricated parts according to claim 1, wherein said anti-infiltration agent is any one of triethanolamine, calcium formate, calcium chloride and urea.
8. A method for preparing a concrete for a precast member according to claim 1, comprising the steps of:
step one, stirring and drying the medium sand and the broken stone in corresponding weight parts in a drying barrel respectively, controlling the temperature at 80-120 ℃, the time at 40-60 min and the stirring speed at 300-500 rpm, and screening and removing impurities to obtain dried medium sand and broken stone;
drying, stirring and mixing the fly ash, the portland cement and the mineral powder in corresponding parts by weight, controlling the temperature to be 80-120 ℃, the time to be 30-40min, and the stirring speed to be 600-900rpm, adding the dried medium sand and the crushed stone after cooling, and continuously stirring and mixing for 10-20min to obtain a mixture;
step three, uniformly mixing water, sodium methyl silicate, triethoxysilane and organic silicon water-soluble resin in corresponding parts by weight in a stirring barrel for 10-20min at the stirring speed of 400-600rpm to obtain a mixed solution;
and step four, pouring the mixture into the mixed solution for multiple times, continuously stirring at the stirring speed of 800 plus 1200rpm, wherein the stirring time of each charging is 10-15min, adding the water reducing agent, the retarder and the anti-permeability agent in corresponding parts by weight after the charging is finished, and continuously stirring for 5-10min to obtain the concrete for the prefabricated part.
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