Cold region crack self-healing ultra-high performance cement-based composite material and preparation method thereof

An ultra-high-performance, composite material technology, applied in the field of building materials and foundation engineering construction, can solve the problems of inconvenient construction mixing and vibration, achieve the effect of improving the bonding state, improving frost resistance and durability, and improving the bending resistance

Active Publication Date: 2020-11-10
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the research on self-healing ultra-high performance cement-based composite materials is fiber reinforced or embedded in hollow glass fiber tubes or glass capsules containing repairing agents, but this method will cause inconvenience to construction mixing and vibration

Method used

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  • Cold region crack self-healing ultra-high performance cement-based composite material and preparation method thereof
  • Cold region crack self-healing ultra-high performance cement-based composite material and preparation method thereof
  • Cold region crack self-healing ultra-high performance cement-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The preparation method of the crack self-healing ultra-high performance cement-based composite material in the cold region, the specific steps are as follows:

[0040] S1. Mix ethanol, water, tetraethoxysilane, 3-aminopropyltriethoxysilane, and ammonium hydroxide to obtain a white colloidal dispersion, remove impurities, and dry the obtained white solid to obtain the amino functionalized Modified nano silicon dioxide, standby;

[0041] S2. Hydrolyzing tetraethoxysilane at a pH of 2 to obtain a precursor; stirring and mixing the precursor with epoxy resin and water to form an emulsion, and adjusting the pH of the emulsion to 10 with 0.1M ammonium hydroxide solution, Obtain the microcapsule suspension, let it stand for aging, centrifuge, and the obtained solids are washed and dried in sequence to obtain the silica-coated epoxy resin microcapsules for subsequent use;

[0042] S3. Weigh 573-705 parts of cement, 361-487 parts of fly ash, 90-240 parts of silica fume, 530-636...

Embodiment 1

[0050] Ultra-high performance cement-based composite material with high workability and compressive strength of 120MPa~160MPa, its unilateral dosage ratio (kg / m 3 )As shown in Table 1:

[0051] Table 1 Proportion of self-healing cement-based composites with compressive strength of 120MPa-160MPa (kg / m 3 )

[0052]

[0053] The capillary water absorption test was carried out on the cement-based composite material prepared in Example 1, and it was measured that under the cracks within 300 μm, the healing period was 28 days, and the weight gain was 7.8 g.

Embodiment 2

[0055] Ultra-high-performance cement-based composite materials with high workability and compressive strength of 120MPa to 160MPa, the unilateral dosage ratio (kg / m 3 )As shown in table 2:

[0056] Table 2 Proportion of cement-based composite materials with self-healing and compressive strength of 120MPa~160MPa (kg / m3)

[0057]

[0058] The capillary water absorption test was carried out on the cement-based composite material prepared in Example 2, and it was measured that in cracks within 300 μm, the healing period was 28 days, and the weight gain was 7.3 g.

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Abstract

The invention belongs to the technical field of building materials and infrastructure construction, and relates to a cold region crack self-healing ultra-high performance cement-based composite material and a preparation method thereof. The composite material is prepared from the following components: cement, fly ash, silica fume, sand, water, a water reducing agent, amino functionalized modifiednano silicon dioxide, a silicon dioxide coated epoxy resin microcapsule material and an organic modified material. The amino functional modified nano silicon dioxide is prepared from water, tetraethoxysilane, 3-aminopropyltriethoxysilane and ammonium hydroxide; the silicon dioxide coated epoxy resin microcapsule is prepared from water, tetraethoxysilane and epoxy resin; and the organic modified material is prepared from a polymer modified reinforcing material and a nano reinforcing material. According to the cold region crack self-healing ultra-high performance cement-based composite materialprovided by the invention, the self-healing characteristic of a bi-component epoxy amine system and the quantum size effect, the filling effect and the crystal nucleus induced hydration reaction of anano material are exerted, so that the anti-freezing performance and durability of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials and foundation engineering construction, and in particular relates to a crack self-healing ultra-high-performance cement-based composite material in cold regions and a preparation method thereof. Background technique [0002] Cement has always been the most important material in national infrastructure construction. In recent years, with the development of large-scale, heavy-duty, and long-span projects, the requirements for building materials are also increasing. The emergence of ultra-high-performance cement-based composite materials meets It meets the requirements for materials in engineering, and is used in construction fields such as roads, bridges, and railways. Ultra-high-performance cement concrete has many advantages: its compressive strength is higher than 150MPa, which is about three times that of traditional concrete; it has excellent toughness and fracture energy, making co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/52C04B18/08C04B18/146C04B14/06C04B2103/302C04B24/281C04B2103/22C04B2103/0068
Inventor 姚冬冬冯振刚纪鸿儒卢喆李新军秦卫军王永光于丽梅李杰于浩
Owner CHANGAN UNIV
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