CN110922132A - Light-weight ultrahigh-strength concrete and preparation method thereof - Google Patents
Light-weight ultrahigh-strength concrete and preparation method thereof Download PDFInfo
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- CN110922132A CN110922132A CN201911224027.8A CN201911224027A CN110922132A CN 110922132 A CN110922132 A CN 110922132A CN 201911224027 A CN201911224027 A CN 201911224027A CN 110922132 A CN110922132 A CN 110922132A
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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
- 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
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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
Abstract
The invention relates to light ultra-high strength concrete and a preparation method thereof, wherein the light ultra-high strength concrete comprises the following components in parts by weight: (600-900), (400-600), (50-300), (50-150), (5-10), (80-500), (140-200), (33-48). Pouring cement, silica fume, fly ash, glass beads and broken stone into a stirring pot, stirring for 2-3 min, uniformly adding steel fibers in the stirring process, and continuing stirring for 2 min; pouring the exciting agent into water, stirring uniformly, then pouring the water containing the exciting agent into a stirring pot, continuously pouring the additive, stirring for 5min, and preparing the formed concrete for natural curing. The invention does not need high-temperature maintenance, can reach 130MPa in 28d under the natural maintenance condition, reduces the maintenance cost and is convenient for practical engineering application.
Description
Technical Field
The invention belongs to the technical field of concrete preparation, and particularly relates to light-weight ultrahigh-strength concrete and a preparation method thereof.
Background
The continuous development of the national economic society puts forward higher and higher quality requirements on the building engineering, the building height is continuously improved nowadays, and the structural span is continuously increased. The traditional concrete has heavy weight and relatively heavy structure, increases the construction difficulty and cost, and has more obvious requirements on light weight and high strength of the concrete. The weight of the lightweight aggregate in China is generally low, the strength of the lightweight concrete produced by the lightweight aggregate is limited, and the volume weight of the concrete is 2000kg/m3The strength was difficult to break through 70 MPa. The development of light high-strength concrete is limited by the strength of aggregate, and the light high-strength concrete is difficult to popularize and apply in practical engineering. The traditional ultrahigh-strength concrete needs high-temperature curing, the curing difficulty is high, and the construction cost is increased.
Disclosure of Invention
The invention aims to provide light-weight ultrahigh-strength concrete and a preparation method thereof, wherein the strength of the concrete obtained by the invention can reach 130MPa, and the volume weight is controlled at 1850kg/m3Left and right. The high-strength high-rise building block has the advantages of low self weight, high strength and strong practicability, and is suitable for super high-rise and large-span building structure parts.
In order to achieve the purpose, the invention provides the following technical scheme:
the lightweight ultrahigh-strength concrete is prepared from the following raw materials in parts by weight: (600-900), (400-600), (50-300), (50-150), (5-10), (80-500), (140-200), (33-48).
In the invention, the cement is ordinary portland cement with the strength of 52.5.
In the invention, the admixture is formed by compounding silica fume and fly ash, the mass ratio of the silica fume to the fly ash is 1:1, the silica fume with the fineness less than 1 mu m accounts for more than 80 percent, and the specific surface area is not less than 15000m2The activity of the coal ash is more than or equal to 115 percent per kg and 28d, and the coal ash is II grade.
In the invention, the crushed stone is I-type crushed stone which meets GBT14685 construction pebble and crushed stone, and the particle size is 5-10 mm.
In the invention, the exciting agent is composed of sodium silicate and sodium carbonate, the sodium silicate and the sodium carbonate reagent are weighed according to the mass ratio of 2:1 and are uniformly mixed, and the mixture is placed into a kit for later use.
In the invention, the steel fiber is copper-plated steel fiber with the diameter of 0.2mm and the length of 13 mm.
In the invention, the true density of the glass beads is 400kg/m3The particle size is 200 meshes.
According to the invention, the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is 30%, and the water is water for mixing common concrete.
The invention relates to a preparation method of light-weight ultrahigh-strength concrete, which comprises the following specific steps:
(1) firstly, weighing cement, an admixture, broken stone, glass beads, an excitant, steel fiber, water and a water reducing agent according to parts by weight;
(2) pouring the cement, the silica fume, the fly ash, the glass beads and the broken stone weighed in the step (1) into a stirring pot, and stirring for 2-3 min to uniformly mix the cement, the silica fume, the fly ash, the glass beads and the broken stone;
(3) uniformly adding the weighed steel fibers into the product obtained in the step (2) in the stirring process, and continuously stirring for 2 min;
(4) pouring the prepared activator into water, uniformly stirring, then pouring the water containing the activator into the stirring pot obtained in the step (3), continuously pouring the additive, stirring for 5min, and uniformly stirring to obtain concrete;
(5) and (5) naturally curing the prepared and molded concrete for 28 days.
Compared with other technologies, the invention has the beneficial effects that:
(1) the glass beads and the common macadam are used for replacing the traditional ceramsite lightweight aggregate, so that the defects of low strength and high water absorption of the ceramsite are overcome, and higher strength can be achieved on the premise of reducing the weight of concrete. Compared with ceramsite, the cost is lower, and the economic benefit is good;
(2) the workability of the concrete is improved by the large amount of fly ash and silica fume, so that the concrete can reach a self-compaction state. Meanwhile, the potential activity of the admixture and the glass beads is excited by adding the active excitant, so that the matrix strength of the cementing material and the interface bonding strength between the aggregate and the matrix are enhanced;
(3) compared with the traditional UHPC, the high-temperature curing is not needed, the 28d can reach 130MPa under the natural curing condition, the curing cost is reduced, and the practical engineering application is facilitated.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The cement adopts three gorges brand P.O52.5 cement with apparent density of 3015 kg/m3The 28d compressive strength is 58.4 MPa; the silica fume is semi-dense silica fume of Sichuan Lantian, and has apparent density of 2174 kg/m3，SiO2Content 96%, specific surface area 15000m2/kg, 28d activity 120%; the fly ash is grade II fly ash of the Yiyang power plant, the fineness is 15 percent, and the activity is 89 percent after 28 d; the glass beads are produced by Henan Yixiang New Material Co., Ltd, have the fineness of 200 meshes and the apparent density of 400kg/m3(ii) a The steel fiber is copper-plated steel fiber with the diameter of 0.2mm and the length of 13 mm. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 28 percent, and the water reducing rate is 30 percent; the broken stone is limestone broken stone produced at the bottom of the Roots, the particle size is 5-10 mm, and the crushing value is 7.9; the activator is anhydrous sodium carbonate and sodium silicate, and is white powder with molecular formula of Na2CO3And Na2SiO3·5H2O; the water is tap water.
A preparation method of light-weight ultrahigh-strength concrete comprises the following steps:
(1) weighing the raw materials according to a proportion, wherein the mass of each raw material is calculated according to the single formula dosage: 780kg of cement, 260kg of silica fume, 260kg of fly ash, 100kg of glass beads, 100kg of broken stone, 120kg of steel fibers, 9kg of exciting agent, 182kg of water and 43kg of additive;
(2) weighing the cement, the silica fume, the fly ash, the glass beads and the broken stone in the materials, pouring the materials into a stirring pot, and stirring for 3min to uniformly mix the materials;
(3) and uniformly adding the weighed steel fibers in the stirring process, and continuously stirring for 2 min.
(4) Pouring the prepared excitant into water, stirring uniformly, then pouring the water containing the excitant into a stirring pot, continuously pouring the additive, stirring uniformly for 5 min;
(5) and (5) naturally curing the prepared and molded concrete for 28 days.
Example 2
The cement adopts three gorges brand P.O52.5 cement with apparent density of 3015 kg/m3The 28d compressive strength is 58.4 MPa; the silica fume is semi-dense silica fume of Sichuan Lantian, and has apparent density of 2174 kg/m3，SiO2Content 96%, specific surface area 15000m2/kg, 28d activity 120%; the fly ash is grade II fly ash of the Yiyang power plant, the fineness is 15 percent, and the activity is 89 percent after 28 d; the glass beads are produced by Henan Yixiang New Material Co., Ltd, have the fineness of 200 meshes and the apparent density of 400kg/m3(ii) a The steel fiber is copper-plated steel fiber with the diameter of 0.2mm and the length of 13 mm. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 28 percent, and the water reducing rate is 30 percent; the broken stone is limestone broken stone produced at the bottom of the Roots, the particle size is 5-10 mm, and the crushing value is 7.9; the activator is anhydrous sodium carbonate and sodium silicate, and is white powder with molecular formula of Na2CO3And Na2SiO3·5H2O; the water is tap water.
A preparation method of light-weight ultrahigh-strength concrete comprises the following steps:
(1) weighing the raw materials according to a proportion, wherein the mass of each raw material is calculated according to the single formula dosage: 600kg of cement, 200kg of silica fume, 200kg of fly ash, 130kg of glass beads, 300kg of broken stone, 250kg of steel fibers, 7kg of exciting agent, 140kg of water and 33kg of additive;
(2) weighing the cement, the silica fume, the fly ash, the glass beads and the broken stone in the materials, pouring the materials into a stirring pot, and stirring for 3min to uniformly mix the materials;
(3) and uniformly adding the weighed steel fibers in the stirring process, and continuously stirring for 2 min.
(4) Pouring the prepared excitant into water, stirring uniformly, then pouring the water containing the excitant into a stirring pot, continuously pouring the additive, stirring uniformly for 5 min;
(5) and (5) naturally curing the prepared and molded concrete for 28 days.
Example 3
The cement adopts three gorges brand P.O52.5 cement with apparent density of 3015 kg/m3The 28d compressive strength is 58.4 MPa; the silica fume is semi-dense silica fume of Sichuan Lantian, and has apparent density of 2174 kg/m3，SiO2Content 96%, specific surface area 15000m2/kg, 28d activity 120%; the fly ash is grade II fly ash of the Yiyang power plant, the fineness is 15 percent, and the activity is 89 percent after 28 d; the glass beads are produced by Henan Yixiang New Material Co., Ltd, have the fineness of 200 meshes and the apparent density of 400kg/m3(ii) a The steel fiber is copper-plated steel fiber with the diameter of 0.2mm and the length of 13 mm. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 28 percent, and the water reducing rate is 30 percent; the broken stone is limestone broken stone produced at the bottom of the Roots, the particle size is 5-10 mm, and the crushing value is 7.9; the activator is anhydrous sodium carbonate and sodium silicate, and is white powder with molecular formula of Na2CO3And Na2SiO3·5H2O; the water is tap water.
A preparation method of light-weight ultrahigh-strength concrete comprises the following steps:
(1) weighing the raw materials according to a proportion, wherein the mass of each raw material is calculated according to the single formula dosage: 840kg of cement, 280kg of silica fume, 280kg of fly ash, 60kg of glass beads, 50kg of macadam, 80kg of steel fiber, 10kg of exciting agent, 196kg of water and 46kg of additive;
(2) weighing the cement, the silica fume, the fly ash, the glass beads and the broken stone in the materials, pouring the materials into a stirring pot, and stirring for 3min to uniformly mix the materials;
(3) and uniformly adding the weighed steel fibers in the stirring process, and continuously stirring for 2 min.
(4) Pouring the prepared excitant into water, stirring uniformly, then pouring the water containing the excitant into a stirring pot, continuously pouring the additive, stirring uniformly for 5 min;
(5) and (5) naturally curing the prepared and molded concrete for 28 days.
Example 4
The cement adopts three gorges brand P.O52.5 cement with apparent density of 3015 kg/m3The 28d compressive strength is 58.4 MPa; the silica fume is semi-dense silica fume of Sichuan Lantian, and has apparent density of 2174 kg/m3，SiO2Content 96%, specific surface area 15000m2/kg, 28d activity 120%; the fly ash is grade II fly ash of the Yiyang power plant, the fineness is 15 percent, and the activity is 89 percent after 28 d; the glass beads are produced by Henan Yixiang New Material Co., Ltd, have the fineness of 200 meshes and the apparent density of 400kg/m3(ii) a The steel fiber is copper-plated steel fiber with the diameter of 0.2mm and the length of 13 mm. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 28 percent, and the water reducing rate is 30 percent; the broken stone is limestone broken stone produced at the bottom of the Roots, the particle size is 5-10 mm, and the crushing value is 7.9; the activator is anhydrous sodium carbonate and sodium silicate, and is white powder with molecular formula of Na2CO3And Na2SiO3·5H2O; the water is tap water.
A preparation method of light-weight ultrahigh-strength concrete comprises the following steps:
(1) weighing the raw materials according to a proportion, wherein the mass of each raw material is calculated according to the single formula dosage: 600kg of cement, 200kg of silica fume, 200kg of fly ash, 140kg of glass beads, 80kg of broken stone, 450kg of steel fibers, 7kg of exciting agent, 140kg of water and 33kg of additive;
(2) weighing the cement, the silica fume, the fly ash, the glass beads and the broken stone in the materials, pouring the materials into a stirring pot, and stirring for 3min to uniformly mix the materials;
(3) and uniformly adding the weighed steel fibers in the stirring process, and continuously stirring for 2 min.
(4) Pouring the prepared excitant into water, stirring uniformly, then pouring the water containing the excitant into a stirring pot, continuously pouring the additive, stirring uniformly for 5 min;
(5) and (5) naturally curing the prepared and molded concrete for 28 days.
Example 5
In the examples, the cement is Sanxia brand P.O52.5 cement with apparent density of 3015 kg/m3The 28d compressive strength is 58.4 MPa; the silica fume is semi-dense silica fume of Sichuan Lantian, and has apparent density of 2174 kg/m3，SiO2Content 96%, specific surface area 15000m2/kg, 28d activity 120%; the fly ash is grade II fly ash of the Yiyang power plant, the fineness is 15 percent, and the activity is 89 percent after 28 d; the glass beads are produced by Henan Yixiang New Material Co., Ltd, have the fineness of 200 meshes and the apparent density of 400kg/m3(ii) a The steel fiber is copper-plated steel fiber with the diameter of 0.2mm and the length of 13 mm. The water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 28 percent, and the water reducing rate is 30 percent; the broken stone is limestone broken stone produced at the bottom of the Roots, the particle size is 5-10 mm, and the crushing value is 7.9; the activator is anhydrous sodium carbonate and sodium silicate, and is white powder with molecular formula of Na2CO3And Na2SiO3·5H2O; the water is tap water.
A preparation method of light-weight ultrahigh-strength concrete comprises the following steps:
(1) weighing the raw materials according to a proportion, wherein the mass of each raw material is calculated according to the single formula dosage: 720kg of cement, 240kg of silica fume, 240kg of fly ash, 100kg of glass beads, 90kg of macadam, 250kg of steel fiber, 8kg of exciting agent, 168kg of water and 40kg of additive;
(2) weighing the cement, the silica fume, the fly ash, the glass beads and the broken stone in the materials, pouring the materials into a stirring pot, and stirring for 3min to uniformly mix the materials;
(3) and uniformly adding the weighed steel fibers in the stirring process, and continuously stirring for 2 min.
(4) Pouring the prepared excitant into water, stirring uniformly, then pouring the water containing the excitant into a stirring pot, continuously pouring the additive, stirring uniformly for 5 min;
(5) and (5) naturally curing the prepared and molded concrete for 28 days.
The concrete performance of the concrete in the examples is detected, and the results of the test are shown in Table 1 according to GB/T50081 Standard test method for mechanical Properties of ordinary concrete and GB/T50080 Standard test method for Performance of ordinary concrete mixture:
TABLE 1 Performance test results
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Compressive strength | 130MPa | 133MPa | 126MPa | 137MPa | 135MPa |
| Volume weight | 1850kg/m3 | 1860 kg/m3 | 1840 kg/m3 | 1850kg/m3 | 1860kg/m3 |
| Slump constant | 240mm | 250mm | 230mm | 240mm | 240mm |
According to the detection result, the embodiment prepared according to the invention can ensure the volume weight of 1850kg/m3And the 28d compressive strength reaches about 130MPa, and the workability is good.
Claims (9)
1. A light ultra-high strength concrete is characterized in that: the cement consists of cement, admixture, broken stone, glass beads, exciting agent, steel fiber, water and water reducing agent, wherein the admixture of the cement comprises the broken stone, the glass beads, the exciting agent, the steel fiber, the water and the water reducing agent in parts by weight: (600-900), (400-600), (50-300), (50-150), (5-10), (80-500), (140-200), (33-48).
2. The lightweight ultra-high strength concrete according to claim 1, wherein: the cement is ordinary portland cement with the strength of 52.5.
3. The lightweight ultra-high strength concrete according to claim 1, wherein: the admixture is formed by compounding silica fume and fly ash, the mass ratio of the silica fume to the fly ash is 1:1, the silica fume with the fineness less than 1 mu m accounts for more than 80 percent, and the specific surface area is not less than 15000m2The activity of the coal ash is more than or equal to 115 percent per kg and 28d, and the coal ash is II grade.
4. The lightweight ultra-high strength concrete according to claim 1, wherein: the gravel is I-type gravel conforming to GBT14685 construction pebbles and gravels, and the particle size is 5-10 mm.
5. The lightweight ultra-high strength concrete according to claim 1, wherein: the activator consists of sodium silicate and sodium carbonate, the sodium silicate and the sodium carbonate reagent are weighed according to the mass ratio of 2:1 and are uniformly mixed, and the mixture is placed into the kit for later use.
6. The lightweight ultra-high strength concrete according to claim 1, wherein: the steel fiber is copper-plated steel fiber with the diameter of 0.2mm and the length of 13 mm.
7. The lightweight ultra-high strength concrete according to claim 1, wherein: the glass micro-beads have a true density of 400kg/m3The particle size is 200 meshes.
8. The lightweight ultra-high strength concrete according to claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is 30%, and the water is water for mixing common concrete.
9. A method for preparing a lightweight ultra-high strength concrete according to claim 1, characterized in that: the method comprises the following specific steps:
(1) firstly, weighing cement, an admixture, broken stone, glass beads, an excitant, steel fiber, water and a water reducing agent according to parts by weight;
(2) pouring the cement, the silica fume, the fly ash, the glass beads and the broken stone weighed in the step (1) into a stirring pot, and stirring for 2-3 min to uniformly mix the cement, the silica fume, the fly ash, the glass beads and the broken stone;
(3) uniformly adding the weighed steel fibers into the product obtained in the step (2) in the stirring process, and continuously stirring for 2 min;
(4) pouring the prepared activator into water, uniformly stirring, then pouring the water containing the activator into the stirring pot obtained in the step (3), continuously pouring the additive, stirring for 5min, and uniformly stirring to obtain concrete;
(5) and (5) naturally curing the prepared and molded concrete for 28 days.
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| CN111454035A (en) * | 2020-05-06 | 2020-07-28 | 中建西部建设新疆有限公司 | Early-strength corrosion-resistant C80 light-weight high-strength concrete and preparation method thereof |
| CN112209683A (en) * | 2020-10-16 | 2021-01-12 | 宜春学院 | Self-compacting C120 ready-mixed dry material concrete and preparation method thereof |
| CN113185244A (en) * | 2021-04-27 | 2021-07-30 | 中建商品混凝土有限公司 | Super air entraining light high-strength concrete and preparation method thereof |
| CN113563044A (en) * | 2021-08-15 | 2021-10-29 | 中建西部建设贵州有限公司 | Metamorphic rock aggregate high-strength concrete and preparation method thereof |
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| CN112209683A (en) * | 2020-10-16 | 2021-01-12 | 宜春学院 | Self-compacting C120 ready-mixed dry material concrete and preparation method thereof |
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