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Inorganic composite material with low carbon steel properties and preparation method thereof

An inorganic composite material and low carbon steel technology, applied in the field of concrete materials, can solve the problems such as the compressive strength can only reach 170-230Mpa, the activity cannot be fully exerted, and the performance indicators cannot reach the low carbon steel. The effect of low elastic modulus, long stress time, and reduced production cost

Active Publication Date: 2019-12-03
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0003] Ordinary low-carbon steel has poor corrosion resistance, and it often needs to be galvanized on the surface and sprayed with anti-rust resin on the surface for corrosion protection.
These surface protection methods will gradually corrode and peel off the surface protection layer as the service time of low carbon steel components prolongs, and the maintenance and repair costs are high.
Highway anti-collision guardrails made of ordinary low-carbon steel, high-speed rail sound barrier trough steel keels, external marble light steel keels for buildings, light steel roof trusses for public parking lots, steel structures for architectural urban sculptures, etc. Wet cycle makes the corrosion resistance of ordinary low carbon steel aggravated, which brings safety hazards
[0004] Reactive powder (RPC) materials have the characteristics of high durability, corrosion resistance, and fire resistance, but most of the existing RPC materials prepared by using active mineral admixtures (such as silica fume, quartz powder) adopt natural curing or dry heat curing. , which leads to the failure of the activity of the internal mineral admixture to be fully exerted, the compressive strength can only reach 170-230Mpa, and the bending strength is roughly 30-60MPa (An Mingzhe, Wang Qingsheng, Ding Jiantong. The preparation principle of active powder concrete and application prospects [J]. Building Technology, 2001,32(1):15-16.), the performance indicators have failed to reach the level of low carbon steel

Method used

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  • Inorganic composite material with low carbon steel properties and preparation method thereof
  • Inorganic composite material with low carbon steel properties and preparation method thereof
  • Inorganic composite material with low carbon steel properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In this embodiment, the raw materials are composed of: cement: silica fume: fly ash: water reducing agent: water: quartz sand=1:0.3:0.62:0.03:0.24:1.1, the calcium-silicon ratio is 0.75, and the long steel fiber volume ratio is 7%, short steel fiber 1%.

[0055] In the first step, put 671.5g of quartz sand, 183.2g of silica fume and 378.5g of fly ash into a mixer and stir for 2 to 3 minutes. After the mixture is evenly stirred, add (30%) 44.0g of ice water to moisten the mineral material and stir for 2 ~3min. Mix the remaining 102.6g of ice water and 18.3g of water reducer evenly, put 610.5g of cement and the remaining ice water into the stirring pot in turn, and stir the mixture for 6 to 10 minutes. After the material forms a slurry, add 420g of long steel fiber and short Steel fiber 60g, stir for 1-2 minutes, until the steel fiber is evenly distributed in the cement mortar.

[0056] In the second step, put the composite mortar of the first step into a triple mold of...

Embodiment 2

[0061] The composition of raw materials in this example is: cement: silica fume: fly ash: water reducer: water: quartz sand = 1:0.35:0.60:0.04:0.23:1.0, the calcium-silicon ratio is controlled at 0.72, and the volume ratio of long steel fibers 4%, short steel fiber 2%.

[0062] In the first step, put 630g of quartz sand, 220.5g of silica fume and 378g of fly ash into a mixer and stir for 2 to 3 minutes. After the mixture is evenly stirred, add (30%) 43.5g of ice water to moisten the mineral material and stir for 2 to 3 minutes. . Mix the remaining 101.4g of ice water and 25.2g of water reducer evenly, put 630g of cement and the remaining ice water into the mixing pot and stir for 6-10 minutes, after the materials form a slurry, add 240g of long steel fibers and 120g of short steel fibers , Stir for 1 to 2 minutes until the steel fibers are evenly distributed in the cement mortar.

[0063] In the second step, put the composite mortar of the first step into a triple mold of 40...

Embodiment 3

[0068] The composition of raw materials in this example is: cement: silica fume: fly ash: water reducer: water: quartz sand = 1:0.3:0.62:0.03:0.24:1.1, the calcium-silicon ratio is controlled at 0.75, and the volume ratio of long steel fibers 5%, short steel fiber 2%.

[0069]In the first step, put 671.5g of quartz sand, 183.2g of silica fume and 378.5g of fly ash into a mixer and stir for 2 to 3 minutes. After the mixture is evenly stirred, add (30%) 44.0g of ice water to moisten the mineral material and stir for 2 ~3min. Mix the remaining 102.6g of ice water and 18.3g of water reducer evenly, put 610.5g of cement and the remaining ice water into the stirring pot and stir for 6-10 minutes, after the materials form a slurry, add 300g of long steel fibers, short steel fibers 120g, stir for 1-2 minutes until the steel fibers are evenly distributed in the cement mortar.

[0070] In the second step, put the composite mortar of the first step into a triple mold of 40*40*160mm, ad...

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Abstract

The invention discloses an inorganic composite material with low carbon steel properties and a preparation method thereof. The inorganic composite material in parts by weight includes 100 parts of cement, 30 to 40 parts of silica fume, 55 to 65 parts of fly ash, 90 to 110 parts of quartz sand, 2 to 4 parts of water reducing agent, 22 to 24 parts of water, 1 to 3% by volume of short steel fiber and3 to 8% by volume of 12 to 20 mm long steel fiber. After mortar is vibrated to form a mold, demolding is carried out, curing is carried out for 1-3 days in a water bath at the temperature of 20-90 DEG C, and saturated steam curing is carried out for 12-24h at the temperature of 200 DEG C to obtain the inorganic composite material. The inorganic composite material of the present invention has highstrength and toughness similar to those of low carbon steel, also possesses the characteristics of corrosion resistance, low heat conductivity coefficient and electromagnetic insulating property andthe like which are not possessed by low-carbon steel, at the same time has very good fire resistance, maintains 85% or more of strength under the condition of 400 DEG C, can effectively make up for the defect of poor fire resistance of the carbon steel material, and can be widely applied to the fields of prefabricated structure, armor protection anti-penetration engineering, nuclear power stationengineering, and the like for replacing the low-carbon steel.

Description

technical field [0001] The invention relates to an inorganic composite material with the properties of low-carbon steel and a preparation method thereof, belonging to the technical field of concrete materials. Background technique [0002] Low-carbon steel has the characteristics of 235-345MPa elastic limit strength, high plasticity and toughness, and has been widely used and developed in steel structure engineering. However, steel is easy to rust in a humid environment, especially in a corrosive medium, which seriously affects its durability. Moreover, the fire resistance of the steel structure is poor. As the temperature increases, the strength decreases. The strength changes little within 250°C. After 300°C, the strength gradually decreases, and the strength drops to zero when it reaches 450-650°C. Therefore, it is necessary to find a new type of material that not only has the high strength and high toughness of low-carbon steel structure, but also has the corrosion resi...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/146C04B14/06C04B18/08C04B2103/302C04B22/002C04B14/48
Inventor 崔崇黄炎琦崔晓昱
Owner NANJING UNIV OF SCI & TECH
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