Crack self-healing ultra-high performance cement-based composite material and preparation method in cold regions

An ultra-high performance, composite material technology, applied in the field of building materials and basic engineering construction, can solve the problems of inconvenient construction, mixing and vibrating, and achieve the effects of reducing development, improving hydration reaction speed, and improving flexural resistance.

Active Publication Date: 2021-12-21
CHANGAN UNIV +1
View PDF10 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Crack self-healing ultra-high performance cement-based composite material and preparation method in cold regions
  • Crack self-healing ultra-high performance cement-based composite material and preparation method in cold regions
  • Crack self-healing ultra-high performance cement-based composite material and preparation method in cold regions

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of building materials and basic engineering construction, and relates to a crack self-healing ultra-high performance cement-based composite material in cold regions and a preparation method thereof, which is made of the following components: cement, fly ash, silica fume, sand , water, water reducing agent, amino-functionalized modified nano-silica, silica-coated epoxy resin microcapsule material, organic modified material; amino-functionalized modified nano-silica composed of water, tetraethoxy silane, 3-aminopropyltriethoxysilane and ammonium hydroxide; silica-coated epoxy resin microcapsules are made of water, tetraethoxysilane, epoxy resin; organically modified materials are made of polymer It is made of material-modified reinforced materials and nano-reinforced materials. The self-healing ultra-high-performance cement-based composite material for cracks in cold regions provided by the present invention exerts the self-healing characteristics of the two-component epoxy amine system and the quantum size effect of nanomaterials, the filling effect and the hydration reaction induced by crystal nuclei. Improve the frost resistance and durability of the material.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap