CN113735518B - Light duct piece based on high-titanium heavy slag light aggregate concrete and preparation method thereof - Google Patents
Light duct piece based on high-titanium heavy slag light aggregate concrete and preparation method thereof Download PDFInfo
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- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 102
- 239000010936 titanium Substances 0.000 title claims abstract description 102
- 238000002360 preparation method Methods 0.000 title abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- 239000004576 sand Substances 0.000 claims description 20
- 239000010881 fly ash Substances 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 16
- 229920006395 saturated elastomer Polymers 0.000 claims description 16
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
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- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group 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 4
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/086—Methods of making concrete lining segments
-
- 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
- C04B2111/00293—Materials impermeable to liquids
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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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- Structural Engineering (AREA)
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- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention provides a light duct piece based on high-titanium heavy slag light aggregate concrete and a preparation method thereof. The light pipe piece comprises the following raw materials: cementing materials, lightweight aggregate, fine aggregate, a water reducing agent, a tackifier and water; the light aggregate is high-titanium heavy slag light aggregate. The light-weight duct piece provided by the invention realizes the reduction of the self weight of the duct piece, the guarantee of the bearing capacity of the duct piece, the reduction of the cracking of the duct piece and the effective prevention of the moisture and Cl in the service environment of the duct piece based on the light weight, high strength and internal maintenance characteristics of high-titanium heavy slag light aggregate‑、SO4 2‑、CO3 2‑The erosion of harmful ions to the pipe piece and the transmission in the pipe piece are performed, so that the durability of the pipe piece, such as water permeability resistance, chloride ion permeability resistance, sulfate erosion resistance, carbonization resistance and the like, is improved; in addition, the cracking of the duct piece is relieved due to the internal curing effect of the high-titanium heavy slag light aggregate, the duct piece can be cured by adopting a standard environment under the condition of not pursuing the turnover speed of a duct piece mold, and the production cost of the duct piece can be obviously reduced.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a light duct piece based on high-titanium heavy slag light aggregate concrete and a preparation method thereof.
Background
The concrete segment used as a permanent lining structural member of shield tunnel engineering not only bears the pressure of rock and soil layers, but also prevents the leakage of underground water, so that the concrete segment is required to have good bearing and anti-permeability performance. The main technical means for improving the bearing capacity and durability of the traditional concrete segment is to increase the steel consumption of the segment or increase the thickness of the segment, which also causes the heavy and uneconomical concrete segment. In addition, in order to ensure the bearing capacity of the concrete segment, the concrete for preparing the segment generally adopts common concrete with the strength grade above C50, the high strength of the common concrete also enables the dosage of cementing materials to be large and the water-cement ratio to be low, so that the concrete segment is easy to shrink and crack, and the requirements of high impermeability and long service life of shield tunnel engineering are difficult to meet. In summary, the existing concrete segment generally has the problems of inconvenient transportation and assembly caused by large size and high self weight, insufficient durability caused by easy cracking and the like.
On the other hand, the self weight of the lightweight aggregate concrete is obviously reduced compared with that of common concrete, the self weight of the duct piece can be obviously reduced when the lightweight aggregate concrete is used for preparing the duct piece, but the strength and the elastic modulus of the existing lightweight aggregate concrete are generally not enough to meet the requirement of the bearing capacity of the duct piece for the shield tunnel.
Based on the technical defects of the existing concrete segment, improvement on the technical defects is needed.
Disclosure of Invention
In view of the above, the invention provides a lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete and a preparation method thereof, so as to solve or partially solve the technical problems in the prior art.
In a first aspect, the invention provides a light duct piece based on high-titanium heavy slag light aggregate concrete, which comprises the following raw materials in parts by weight: 450-540 parts of a cementing material, 550-750 parts of a lightweight aggregate, 500-700 parts of a fine aggregate, 7-10 parts of a water reducing agent, 0.2-0.4 part of a tackifier and 140-170 parts of water;
wherein the lightweight aggregate is high-titanium heavy slag lightweight aggregate.
Preferably, the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete has the apparent density of 1000-2000 kg/m3The cylinder pressure strength is 6-20 MPa, the saturated water absorption rate is 10-20%, and the grading of the high-titanium heavy slag light aggregate particles is 5-31.5 mm continuous grading.
Preferably, the weight ratio of the cement to the silica fume to the fly ash is 1 (0.08-0.12) to 0.06-0.25.
Preferably, the cement of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is P.O 42.5.5 ordinary portland cement.
Preferably, the specific surface area of the light pipe piece based on the high-titanium heavy slag light aggregate concrete is 19000-21000 m2/kg、SiO2The content is 90-98%.
Preferably, the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is I-grade fly ash, and the specific surface area of the fly ash is 300-400 m2And/kg, wherein the water demand ratio of the fly ash is 90-95 wt%.
Preferably, the light duct piece based on the high-titanium heavy slag light aggregate concrete is characterized in that the fine aggregate is river sand, the fineness modulus of the river sand is 2.3-3.0, and the mud content is 0.01-0.5%;
and/or the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is 25-40%;
and/or the viscosity increaser is hydroxypropyl methyl cellulose ether.
In a second aspect, the invention further provides a preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete, which comprises the following steps:
pouring water into the paved lightweight aggregate for 20-24 hours for pre-wetting treatment under the conditions that the temperature is 20-25 ℃ and the relative humidity is 50-100%, so as to ensure the saturated surface of the lightweight aggregate to be dry;
adding the cementing material, the pre-wetted lightweight aggregate and the fine aggregate into a stirrer, dry-stirring for 3-4 min, adding water, a water reducing agent and a tackifier, and continuously stirring for 5-8 min to obtain a mixture;
pouring the mixture into a duct piece mold with a steel reinforcement framework, and performing vibration molding;
and carrying out standard curing or steam curing on the molded mold and the mixture to prepare the high-titanium heavy slag lightweight aggregate concrete-based lightweight duct piece.
Preferably, the preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete comprises the following steps of: firstly, vibrating for 4-5 min at the frequency of 20-30 Hz, then vibrating for 2-3 min at the frequency of 30-40 Hz, and the total vibration time is 6-8 min.
Preferably, the preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete comprises the following standard maintenance process: curing at the curing temperature of 18-22 ℃ and the relative humidity of 95-100% to obtain the duct piece, removing the mold when the compressive strength of the duct piece reaches more than 15MPa, and curing to 28 days after mold removal;
the steam curing specifically comprises the following steps: firstly, curing for 3-5 hours in an environment with the temperature of 18-22 ℃ and the relative humidity of 95-100%; then moving the mixture into a steam environment, uniformly raising the temperature to 50-60 ℃ at a heating rate of 15-20 ℃/h, maintaining the mixture at a constant temperature for 8-12h, and uniformly cooling the mixture to room temperature at a temperature of 15-20 ℃/h after the constant temperature is finished; removing the mold; and after the mold is removed, moving to the curing temperature of 18-22 ℃, and curing to 28 days in the environment with the relative humidity of 95-100%.
Compared with the prior art, the light duct piece based on the high-titanium heavy slag light aggregate concrete and the preparation method thereof have the following beneficial effects:
(1) according to the light duct piece based on the high-titanium heavy slag light aggregate concrete, the high-titanium heavy slag light aggregate is used as the aggregate, the self weight of the duct piece is reduced based on the light characteristic of the high-titanium heavy slag light aggregate, and the duct piece is convenient to transport and assemble; based on the high-strength characteristic of the high-titanium heavy slag lightweight aggregate, the strength and the elastic modulus of the duct piece are ensured, and the bearing capacity of the duct piece is ensured; based on the internal curing characteristic of the high-titanium heavy slag light aggregate, when the internal humidity of the duct piece is reduced, the high-titanium heavy slag releases pre-stored moisture so as to maintain the internal humidity of the duct piece, slow down the gradient of the internal humidity of the duct piece, reduce the self-shrinkage of the light duct piece concrete and prevent the problem of duct piece cracking caused by the over-quick increase of the self-shrinkage stress; the release of segment cracking can effectively ensure the later strength and the bearing capacity of the light segment, and can effectively prevent the moisture and Cl in the service environment of the segment-、SO4 2-、CO3 2-Erosion of harmful plasma to the pipe piece and transmission in the pipe piece, thereby improving the pipe pieceDurability such as water permeability resistance, chloride ion permeability resistance, sulfate erosion resistance, carbonation resistance and the like;
(2) according to the light duct piece prepared based on the high-titanium heavy slag light aggregate concrete, due to the internal curing effect of the high-titanium heavy slag light aggregate, the cracking of the duct piece is relieved, the duct piece can be cured in a standard environment under the condition that the turnover rate of a duct piece mold is not pursued, and the production cost of the duct piece is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a surface topography of a high titanium heavy slag lightweight aggregate for use in the present invention;
FIG. 2 is a graph of the apparent density and 28d compressive strength of the lightweight duct pieces prepared in examples 1, 7-9 of the present invention.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the application provides a light duct piece based on high-titanium heavy slag light aggregate concrete, which comprises the following raw materials in parts by weight: 450-540 parts of a cementing material, 550-750 parts of a lightweight aggregate, 500-700 parts of a fine aggregate, 7-10 parts of a water reducing agent, 0.2-0.4 part of a tackifier and 140-170 parts of water;
wherein the lightweight aggregate is high-titanium heavy slag lightweight aggregate.
In some embodimentsThe apparent density of the medium and high titanium heavy slag light aggregate is 1000-2000 kg/m3The cylinder pressure strength is 6-20 MPa, the saturated water absorption is 10-20%, and the grading of the high-titanium heavy slag light aggregate particles is 5-31.5 mm continuous grading.
In some embodiments, the mass ratio of the cement to the silica fume to the fly ash is 1 (0.08-0.12) to (0.06-0.25).
In some embodiments, the cement is P.O 42.5.5 portland cement.
In some embodiments, the silica fume has a specific surface area of 19000 to 21000m2/kg、SiO2The content is 90-98%.
In some embodiments, the fly ash is class I fly ash, the specific surface area of the fly ash is 300-400 m2/kg, and the water demand ratio of the fly ash is 90-95 wt%.
In some embodiments, the fine aggregate is river sand, the fineness modulus of the river sand is 2.3-3.0, and the mud content is 0.01-0.5%;
and/or the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is 25-40%;
and/or the viscosity increaser is hydroxypropyl methyl cellulose ether.
According to the light duct piece based on the high-titanium heavy slag light aggregate concrete, the high-titanium heavy slag light aggregate is used as the aggregate, the self weight of the duct piece is reduced based on the light characteristic of the high-titanium heavy slag light aggregate, and the duct piece is convenient to transport and assemble; based on the high-strength characteristic of the high-titanium heavy slag lightweight aggregate, the strength and the elastic modulus of the duct piece are ensured, and the bearing capacity of the duct piece is ensured; based on the internal curing characteristic of the high-titanium heavy slag light aggregate, when the internal humidity of the duct piece is reduced, the high-titanium heavy slag releases pre-stored moisture so as to maintain the internal humidity of the duct piece, slow down the gradient of the internal humidity of the duct piece, reduce the self-shrinkage of the light duct piece concrete and prevent the problem of duct piece cracking caused by the over-quick increase of the self-shrinkage stress; the release of segment cracking can effectively ensure the later strength and the bearing capacity of the light segment, and can effectively prevent the moisture and Cl in the service environment of the segment-、SO4 2-、CO3 2-Erosion of harmful ions to the pipe piece and transmission inside the pipe piece are achieved, and therefore water seepage resistance of the pipe piece is improvedPermeability, chloride ion permeability resistance, sulfate erosion resistance, carbonation resistance and the like.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the light duct piece based on the high-titanium heavy slag light aggregate concrete, which comprises the following steps:
s1, pouring water into the paved lightweight aggregate for 20-24 hours for pre-wetting treatment under the conditions that the temperature is 20-25 ℃ and the relative humidity is 50-100%, so as to ensure the saturated surface of the lightweight aggregate to be dry;
s2, adding the cementing material, the pre-wetted lightweight aggregate and the fine aggregate into a stirrer, dry-mixing for 3-4 min, adding water, a water reducing agent and a tackifier, and continuously stirring for 5-8 min to obtain a mixture;
s3, pouring the mixture into a duct piece mold with a steel reinforcement framework, and performing vibration molding;
and S4, carrying out standard curing or steam curing on the molded mold and the concrete mixture together to prepare the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete.
In the examples of the above applications, the lightweight aggregate is subjected to the pre-wetting treatment in step S1, and the added water is equal to or more than the saturated water absorption of the lightweight aggregate, thereby ensuring that the lightweight aggregate absorbs water in a saturated state.
According to the light duct piece prepared based on the high-titanium heavy slag light aggregate concrete, due to the internal curing effect of the high-titanium heavy slag light aggregate, the cracking of the duct piece is relieved, the standard environment can be adopted for curing under the condition that the turnover rate of a duct piece mold is not pursued, and the production cost of the duct piece is reduced.
In some embodiments, the vibration forming is embodied as: firstly vibrating for 4-5 min at the frequency of 20-30 Hz, and then vibrating for 2-3 min at the frequency of 30-40 Hz, wherein the total vibration time is 6-8 min.
In some embodiments, the standard curing process specifically comprises: curing at the curing temperature of 18-22 ℃ and the relative humidity of 95-100% to obtain the duct piece, removing the mold when the compressive strength of the duct piece reaches more than 15MPa, and curing to 28 days after mold removal;
the steam curing specifically comprises the following steps: firstly, curing for 3-5 hours in an environment with the temperature of 18-22 ℃ and the relative humidity of 95-100%; then moving the mixture into a steam environment, uniformly raising the temperature to 50-60 ℃ at a heating rate of 15-20 ℃/h, maintaining the mixture at a constant temperature for 8-12h, and uniformly cooling the mixture to room temperature at a temperature of 15-20 ℃/h after the constant temperature is finished; and the temperature difference between the pipe piece temperature after steam curing and the outside is not more than 20; removing the mold at the temperature of 18-22 ℃ after removing the mold, and curing to 28 days in an environment with the relative humidity of 95-100%.
The lightweight duct piece based on high titanium heavy slag lightweight aggregate concrete and the preparation method thereof according to the present application are further described below with specific examples.
Example 1
The embodiment of the application provides a light duct piece based on high-titanium heavy slag light aggregate concrete, which comprises the following raw materials in parts by weight: 450 parts of cement, 50 parts of silica fume, 40 parts of fly ash, 530 parts of river sand, 730 parts of lightweight aggregate, 9 parts of water reducing agent, 0.3 part of tackifier and 150 parts of water;
wherein the cement is P.O 42.5.5 cement produced by Dongguan cement factory with Chao Dongguang share; the specific surface area of the silica fume produced by a water purification material factory with the balance of City Yuanheng is 19800m2/kg，SiO2The content is 95 wt%; the coal ash is I-grade coal ash produced by Suyuan of Zhenjiang wall power plant, and the specific surface area is 340m2Kg, water requirement ratio 93 wt%; the lightweight aggregate is high-titanium heavy slag lightweight aggregate produced by Panzhihua Sichuan branchlet and has apparent density of 1780kg/m3The cylinder pressure strength is 8.6MPa, the saturated water absorption is 11.3 percent, and the grain composition is 5-20mm continuous composition; the river sand is medium sand produced in Anhui Liu Anhui, and the fineness modulus is 2.5; the water reducing agent is a Jiangsu Borter polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is 30 percent; the tackifier is hydroxypropyl methyl cellulose ether; the water meets the requirements of JGJ63-2006 Water Standard for concrete.
The preparation method of the light pipe piece based on the high-titanium heavy slag light aggregate concrete comprises the following steps:
s1: pouring water into the paved lightweight aggregate for 24 hours at the room temperature of 20 ℃ and the relative humidity of 100 percent to ensure the saturated surface dryness of the lightweight aggregate;
s2: adding the cementing material, the pre-wetted lightweight aggregate and the fine aggregate into a stirrer, and dry-mixing for 3-4 min,
adding water, a water reducing agent and a tackifier, and continuously stirring for 5-8 min to obtain a mixture;
s3: pouring the mixture prepared in the step S2 into a segment mould provided with a steel reinforcement framework through material injection equipment, and performing vibration molding;
s4: during vibration molding, a mode of distributing while vibrating is adopted, and the vibration frequency is divided into two stages: firstly vibrating for 4-5 min at the frequency of 30Hz, then vibrating for 2-3 min at the frequency of 40Hz, and the total vibration time is 6-8 min;
s5: and (3) curing the molded die and the product together in a standard environment, wherein the standard curing process comprises the following steps: and curing at the temperature of 20 ℃ and the relative humidity of 96% to obtain the tube sheet, removing the mold of the tube sheet when the compressive strength of the standard curing test block reaches above 15MPa, and curing for 28 days after the mold is removed.
Example 2
The embodiment of the application provides a lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete, which is different from the embodiment 1 in that the used lightweight aggregate is high-titanium heavy slag lightweight aggregate produced by Panzhihua Sichuan climbing flowers, and the apparent density of the lightweight duct piece is 1780kg/m3The cylinder pressure strength is 8.6MPa, the saturated water absorption is 11.3 percent, the grain composition is 5-31.5 mm continuous composition, and the rest components are the same as those in the embodiment 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Example 3
The embodiment of the application provides a lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete, which is different from the embodiment 1 in that the used lightweight aggregate is high-titanium heavy slag lightweight aggregate produced by Panzhihua Sichuan climbing flowers, and the apparent density of the lightweight duct piece is 1780kg/m3The cylinder pressure strength is 8.6MPa, the saturated water absorption is 11.3 percent, the grain composition is 5-16 mm continuous composition, and the rest components are the same as those in the embodiment 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Example 4
The embodiment of the application provides a light duct piece based on high-titanium heavy slag light aggregate concrete, which comprises the following raw materials in parts by weight: 450 parts of cement, 50 parts of silica fume, 40 parts of fly ash, 500 parts of river sand, 760 parts of lightweight aggregate, 9 parts of water reducing agent, 0.3 part of tackifier and 150 parts of water; the performance parameters of each component are the same as those of example 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Example 5
The embodiment of the application provides a light duct piece based on high-titanium heavy slag light aggregate concrete, which comprises the following raw materials in parts by weight: 450 parts of cement, 50 parts of silica fume, 40 parts of fly ash, 550 parts of river sand, 710 parts of lightweight aggregate, 9 parts of water reducing agent, 0.3 part of tackifier and 150 parts of water; the performance parameters of each component are the same as those of example 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Example 6
The embodiment of the application provides a light pipe piece based on high-titanium heavy slag and light aggregate concrete, which comprises the following raw materials in parts by weight: 450 parts of cement, 50 parts of silica fume, 40 parts of fly ash, 580 parts of river sand, 680 parts of lightweight aggregate, 9 parts of water reducing agent, 0.3 part of tackifier and 150 parts of water; the performance parameters of each component are the same as those of example 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Example 7
The embodiment of the application provides a lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete, which is different from the embodiment 1 in that the used lightweight aggregate is high-titanium heavy slag lightweight aggregate produced by Panzhihua province, and the apparent density of the lightweight duct piece is 1580kg/m3The cylinder pressure strength is 6.0MPa, the saturated water absorption is 15.4%, the grain composition is 5-20mm continuous composition, and the rest components are the same as those in the embodiment 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Example 8
The embodiment of the application providesA lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete, similar to example 1, differs in that the lightweight aggregate used is high-titanium heavy slag lightweight aggregate produced by Panzhihua Sichuan climbing flower, and the apparent density thereof is 1640kg/m3The cylinder pressure strength is 6.7MPa, the saturated water absorption is 14.2 percent, the particle grading is 5-20mm continuous grading, and the rest components are the same as those in the embodiment 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Example 9
The embodiment of the application provides a lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete, which is different from the embodiment 1 in that the lightweight aggregate is high-titanium heavy slag lightweight aggregate produced by Panzhihua province, and the apparent density of the lightweight aggregate is 1950kg/m3The cylinder pressure strength is 9.5MPa, the saturated water absorption is 10.6 percent, the particle grading is 5-20mm continuous grading, and the rest components are the same as those in the example 1.
The preparation method of the lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is the same as that in example 1.
Performance test
The prepared lightweight duct piece based on the high-titanium heavy slag lightweight aggregate concrete is not suitable for destructive detection, and the mechanical property and durability of the lightweight duct piece are subjected to destructive detection by adopting the lightweight aggregate concrete independent standard test block with the same proportion, the same material and the same preparation method. The following related performance detection is respectively carried out according to GB/T50080-2016 standard for testing the performance of common concrete mixtures, GB/T50081-2016 standard for testing the mechanical performance of common concrete and GB/T50082-2009 standard for testing the long-term performance and the durability of common concrete.
FIG. 1 is a surface topography of a high titanium heavy slag lightweight aggregate used in example 1 of the present application.
The apparent density and 28d compressive strength of the lightweight duct pieces prepared in examples 1, 7-9 were tested and the results are shown in fig. 2.
As can be seen from fig. 2, under the same mixing ratio condition, the apparent density of the lightweight duct piece increases as the high titanium heavy slag lightweight aggregate barrel pressure increases. From fig. 2, it can be found that as the high titanium heavy slag lightweight aggregate barrel compressive strength increases, the compressive strength of the lightweight duct piece 28d is obviously improved, and the four groups of 28d strength are respectively 54.0MPa, 58.6MPa, 61.0MPa and 64.2 MPa. When the high-titanium heavy slag lightweight aggregate barrel pressure strength is increased, the corresponding apparent density of the lightweight aggregate is improved, the void ratio generated by aggregate accumulation is reduced, the compactness of the lightweight duct piece is improved, and the compressive strength is also improved. In addition, because the strength of the lightweight aggregate is lower than that of the set cement, the improvement of the barrel pressure strength is also beneficial to improving the strength and the bearing capacity of the lightweight duct piece.
Comparing the apparent density and the mechanical property of the light-weight duct piece prepared in the embodiments 1, 7-9, and considering the economy comprehensively, the high-titanium heavy slag light aggregate with the cylinder pressure strength of 8.6MPa is preferably selected when preparing the light-weight duct piece.
The apparent density and compressive strength of the lightweight duct pieces prepared in example 1 were tested and the results are shown in table 1 below.
TABLE 1 apparent Density and compressive Strength of lightweight duct pieces
The lightweight duct pieces prepared in example 1 were tested for freeze resistance and the results are shown in table 2 below.
TABLE 2 Freeze resistance of lightweight duct pieces
As can be seen from table 2, the lightweight duct pieces prepared in example 1 had no loss of quality and no change in appearance 250 times of freeze-thaw cycles, indicating that the lightweight duct pieces prepared in example 1 had good freeze resistance.
The light-weight duct sheet prepared in example 1 was tested for durability and the results are shown in table 3 below.
TABLE 3 durability of lightweight duct pieces
As can be seen from table 3, the lightweight duct sheet prepared in example 1 has excellent durability, and the impermeability rating of 28d is up to P12, the chloride permeability coefficient of 28d is 1.3 × 10-12m2The carbonization depth of the solution per second and 360d is only 1.0mm, and the strength loss rate of the solution eroded by 5 percent sodium sulfate at 180d is 14.1 percent.
The lightweight duct sheet 28d prepared in examples 1-3 was tested for compressive strength, apparent density, and self-shrinkage, and the results are shown in table 4 below.
Table 4-28 d compressive strength, apparent density and self-shrinkage of lightweight duct pieces
As can be seen from Table 4, the compressive strength of the lightweight duct pieces decreased significantly as the particle size of the high titanium heavy slag lightweight aggregate increased. As the particle size of the high-titanium heavy slag light aggregate is increased, the apparent density of the light pipe piece is reduced, and the self-shrinkage rate of the light pipe piece is increased. The larger the grain size of the high-titanium heavy slag light aggregate is, the smaller the stacking density of the high-titanium heavy slag light aggregate is, and the lower the compactness of the prepared light pipe piece is and the larger the shrinkage rate is under the condition of the same amount of gelled slurry. However, when the maximum particle size of the high-titanium heavy slag lightweight aggregate is 31.5mm, the shrinkage rate of the tube sheet is only 265 x 10-6. The prewetted high-titanium heavy slag lightweight aggregate can fully play an internal curing role in concrete, improve the early internal humidity of the lightweight duct piece and reduce the self-shrinkage of the lightweight duct piece. The saturated water absorption of the high-titanium heavy slag lightweight aggregate for the test can reach 11.3 percent, and the high-titanium heavy slag lightweight aggregate has excellent internal curing effect. Therefore, the light pipe piece prepared by the high-titanium heavy slag light aggregate has low shrinkage and good crack resistance.
Based on the analysis, the maximum particle size of the high-titanium heavy slag lightweight aggregate is controlled within a proper range, and the maximum particle size is a key factor for obtaining better performance of the lightweight duct piece. The influence of the grain size of the high-titanium heavy slag light aggregate on the performance of the light pipe sheet is comprehensively considered, and 5-20mm continuous gradation is preferably selected in the grain size range.
The performance results of the lightweight duct pieces prepared in test examples 1, 4-6 are shown in table 5 below.
Table 5-properties of the light weight tubesheets prepared in the different examples
As can be seen from table 5, the apparent density of the lightweight duct pieces increased significantly as the amount of high titanium heavy slag lightweight aggregate used decreased; when the sand rate is 46%, the apparent density of the lightweight pipe piece is the maximum and is 2080kg/m3. While the apparent density of the conventional lightweight duct sheet is generally about 2450kg/m3. The light-weight duct piece prepared by the high-titanium heavy slag light aggregate can obviously reduce the self weight of the duct piece and provides convenience for transportation and assembly of the duct piece. Along with the increase of the sand rate from 40% to 46%, the compressive strength and the rupture strength of the light-weight duct piece are slightly increased, but the variation range is not large, the minimum 28d compressive strength/rupture strength is 57.2/4.9MPa, and the requirement of the duct piece strength is met. The sand rate is increased from 40% to 46%, the split tensile strength of the pipe piece is respectively increased by 7.5%, 7.5% and 10.0%, and the elastic modulus is respectively increased by 1.1%, 3.5% and 6.7%. Along with the increase of the sand rate, the toughness index of the light-weight duct piece is reduced, and the brittleness of the light-weight duct piece is increased. This is because the sand fraction is increased, the content of high titanium heavy slag lightweight aggregate in the lightweight duct piece is reduced, the content of river sand is increased, and the elastic modulus of the lightweight duct piece is increased. The toughness of the lightweight duct piece is closely related to the strength and the elastic modulus thereof, and the toughness decreases with the increase of the strength and the elastic modulus.
Based on the analysis, the influence of different high-titanium heavy slag light aggregate contents on the performance of the light pipe sheet is comprehensively considered, and the sand rate is preferably selected to be 42-44%.
In conclusion, the high-titanium heavy slag light aggregate adopted by the application has a rough and porous surface, can absorb water from the gelled slurry in the initial stage of hydration, and is subjected to continuous reduction of the internal humidity of the light pipe piece and osmotic pressure along with the hydrationAnd the high-titanium heavy slag light aggregate slowly releases water to the periphery under the coupling action of humidity difference, so that the reduction of the internal humidity of the light pipe piece is slowed down, the hydration degree of the gelled slurry around the light pipe piece is improved, an interface transition area is compact, no obvious microcrack exists, and the impermeability of the light pipe piece is improved. Cl with water as carrier due to improvement of impermeability of light pipe piece-And SO4 2-The light pipe piece is more difficult to enter, and the chlorine ion penetration resistance and the sulfate erosion resistance of the light pipe piece are improved. While carbonization is CO in air2Diffused and permeated into the interior of the light tube sheet along the inner capillary pores and microcracks and Ca (OH)2Neutralization reaction occurs, the alkalinity inside the light pipe piece is reduced, and the protection of the reinforcing steel bars is weakened. The humidity compensation effect of the high-titanium heavy slag light aggregate improves the shrinkage of the light pipe piece, reduces the generation of micro cracks in the light pipe piece, improves the generation amount of hydration products, improves the internal compactness of the light pipe piece, and effectively blocks CO2A transport path inside the lightweight duct sheet. In addition, the high-titanium heavy slag lightweight aggregate has low elastic modulus and a porous structure compared with the common crushed stone aggregate, and can buffer and release expansion stress generated by sulfate erosion or freeze-thaw cycle in the lightweight duct piece, thereby improving the sulfate erosion resistance and the freezing resistance of the lightweight duct piece. From tables 1 to 5, it is found that the high titanium heavy slag light aggregate with the cylinder pressure strength of 8.6MPa, the grain size range of 5-20mm and the sand rate of 42-44% is preferably selected when preparing the light segment by comparing the apparent density and the mechanical property of the light segment with different strength, grain size and dosage compared with the high titanium heavy slag light aggregate and comprehensively considering the economy.
The high compressive strength and the bending resistance of the light duct piece greatly improve the mechanical property of the light duct piece, so that the bearing load is improved by 3-5 times under the conditions that reinforcing steel bars are not increased and the thickness is not reduced; the cross-section thickness 1/3 can be reduced under the condition of unchanging load, and the steel consumption is saved by 20-25%. The fly ash in the light duct piece partially replaces silica fume, so that the economical efficiency of duct piece materials is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A light pipe piece based on high-titanium heavy slag light aggregate concrete is characterized by comprising the following raw materials in parts by weight: 450 parts of cement, 50 parts of silica fume, 40 parts of fly ash, 530-580 parts of river sand, 680-730 parts of lightweight aggregate, 9 parts of water reducing agent, 0.3 part of tackifier and 150 parts of water;
wherein, the cement is P.O 42.5.5 cement; the specific surface area of the silica fume is 19800m2/kg，SiO2The content is 95 wt%; the fly ash is I-grade fly ash, and the specific surface area is 340m2Kg, water requirement ratio 93 wt%; the lightweight aggregate is high-titanium heavy slag lightweight aggregate produced by Panzhihua Sichuan branchlet and has apparent density of 1780kg/m3The cylinder pressure strength is 8.6MPa, the saturated water absorption is 11.3 percent, and the grain composition is 5-20mm continuous composition; the fineness modulus of the river sand is 2.5; the water reducing agent is a high-efficiency water reducing agent, and the water reducing rate is 30%; the tackifier is hydroxypropyl methyl cellulose ether.
2. The method for preparing a lightweight duct piece based on high titanium heavy slag lightweight aggregate concrete according to claim 1, characterized by comprising the steps of:
pouring water into the paved lightweight aggregate for 20-24 hours for pre-wetting treatment under the conditions that the temperature is 20-25 ℃ and the relative humidity is 50-100%, so as to ensure the saturated surface dryness of the lightweight aggregate;
adding the cementing material, the pre-wetted lightweight aggregate and the fine aggregate into a stirrer, dry-stirring for 3-4 min, adding water, a water reducing agent and a tackifier, and continuously stirring for 5-8 min to obtain a mixture;
pouring the mixture into a duct piece mold with a steel reinforcement framework, and performing vibration molding;
and carrying out standard curing or steam curing on the molded mold and the concrete mixture to prepare the high-titanium heavy slag lightweight aggregate concrete-based lightweight duct piece.
3. The method for preparing a lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete according to claim 2, wherein the vibration molding specifically comprises: firstly, vibrating for 4-5 min at the frequency of 20-30 Hz, then vibrating for 2-3 min at the frequency of 30-40 Hz, and the total vibration time is 6-8 min.
4. The method for preparing a lightweight duct piece based on high-titanium heavy slag lightweight aggregate concrete according to claim 2, wherein the standard curing process specifically comprises: curing at the curing temperature of 18-22 ℃ and the relative humidity of 95-100% to obtain the duct piece, removing the mold when the compressive strength of the duct piece reaches more than 15MPa, and curing to 28 days after mold removal;
the steam curing specifically comprises the following steps: firstly, curing for 3-5 hours in an environment with the temperature of 18-22 ℃ and the relative humidity of 95-100%; then moving the mixture into a steam environment, uniformly raising the temperature to 50-60 ℃ at a heating rate of 15-20 ℃/h, maintaining the mixture at a constant temperature for 8-12h, and uniformly cooling the mixture to room temperature at a temperature of 15-20 ℃/h after the constant temperature is finished; removing the mold; and after the mold is removed, moving to the curing temperature of 18-22 ℃, and curing to 28 days in the environment with the relative humidity of 95-100%.
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