Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Flame retardant modified asphalt, flame retardant asphalt concrete and preparation method thereof, and application of slaked lime as flame retardant

A technology of asphalt concrete and modified asphalt, which is applied in the field of flame-retardant asphalt, can solve the problems that the application has not attracted the attention of researchers, and achieve the effects of flame-retardant and smoke suppression, prolonging the ignition time of asphalt, and low price

Active Publication Date: 2015-05-20
ZHEJIANG UNIV
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the experience of traditional metal hydroxide flame retardants, the decomposition temperature of slaked lime (the main component is calcium hydroxide) is relatively high, about 360-540°C, which is higher than the ignition point of general road asphalt (about 250-330°C ), so slaked lime cannot undergo an endothermic dehydration reaction in the initial combustion stage of asphalt like magnesium hydroxide and aluminum hydroxide, so its application in asphalt flame retardancy has not attracted the attention of researchers.

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
  • Flame retardant modified asphalt, flame retardant asphalt concrete and preparation method thereof, and application of slaked lime as flame retardant
  • Flame retardant modified asphalt, flame retardant asphalt concrete and preparation method thereof, and application of slaked lime as flame retardant
  • Flame retardant modified asphalt, flame retardant asphalt concrete and preparation method thereof, and application of slaked lime as flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A modified flame retardant asphalt, its preparation method is as follows:

[0039] Take a certain amount of asphalt and heat it to 160±5°C; then add the asphalt into a high-shear mixer emulsifier and stir, and slowly add slaked lime (d 50 =7μm, Ca(OH) 2 Content is 96%), the consumption of slaked lime is 40% of former unmodified asphalt quality, then with the rotating speed of 5000 rev / min stirring 30min; Then with 500 rev / min stirring 15min to drive away the bubble, stop heating and cool; During the process, manual stirring was performed to prevent segregation, and the modified flame-retardant asphalt was finally obtained.

Embodiment 2

[0041] A modified flame retardant asphalt, its preparation method is as follows:

[0042] Take a certain amount of asphalt and heat it to 160±5°C; then add the asphalt into a high-shear mixer emulsifier and stir, and slowly add slaked lime (d 50 =7μm, Ca(OH) 2 Content is 96%), the consumption of slaked lime is 30% of former unmodified asphalt mass, then stirs 30min with the rotating speed of 5000 revs / min; Stirs 15mins with 500 revs / min again to drive away air bubble, stops heating and cools; During the process, manual stirring was performed to prevent segregation, and the modified flame-retardant asphalt was finally obtained.

Embodiment 3

[0044] A modified flame retardant asphalt, its preparation method is as follows:

[0045] Take a certain amount of asphalt and heat it to 160±5°C; then add the asphalt into a high-shear mixer emulsifier and stir, and slowly add slaked lime (d 50 =7μm, Ca(OH) 2 Content is 96%), the consumption of slaked lime is 50% of former unmodified asphalt quality, then with the rotating speed of 5000 rev / min stirring 30min; With 500 rev / min stirring 15min to drive away bubble, stop heating and cool; During the process, manual stirring was performed to prevent segregation, and the modified flame-retardant asphalt was finally obtained.

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

No PUM Login to View More

Abstract

The invention discloses flame retardant modified asphalt. The mass of added slaked lime is 25% to 80% of the mass of original unmodified asphalt. The invention also discloses a flame retardant asphalt concrete, which comprises the following raw materials by mass percent: 86% to 93% of aggregates, 3% to 6% of asphalt, 0.6% to 4.8% of slaked lime, and 3 % to 7% of limestone dust. The invention also discloses a preparation method of the flame retardant asphalt concrete. The preparation method comprises the following steps: heating the asphalt to 140 to 170 DEG C, and then adding the asphalt to 180 to 200 DEG C aggregates to be mixed for 85 to 95 seconds; simultaneously adding slaked lime and limestone dust to be mixed again for 85 to 95 seconds, and then molding to obtain the flame retardant asphalt concrete. The invention also discloses application of slaked lime as an asphalt flame retardant. When the slaked slime is used as the flame retardant of the flame retardant modified asphalt and the asphalt concrete, the oxygen index of the asphalt can be enhanced, the time to ignition of the asphalt is prolonged, and the combustion heat release rate and the CO release rate of the asphalt are reduced; the high and low temperature performance and the water stability of the asphalt concrete are improved, and the application value is good.

Description

technical field [0001] The invention relates to the technical field of flame-retardant asphalt, in particular to modified flame-retardant asphalt, flame-retardant asphalt concrete and a preparation method thereof, and the application of slaked lime as an asphalt flame retardant. Background technique [0002] Due to the advantages of low noise, good long-term skid resistance, easy maintenance, and comfortable driving, asphalt concrete pavement is more and more used in road tunnels. Asphalt is a combustible organic compound composed of carbon, hydrogen and other elements. When a fire occurs in a tunnel, under the joint action of convection and radiation heat transfer, the temperature of the tunnel road surface will far exceed the ignition point of the asphalt, thus igniting the asphalt in a certain range of road surface Material. Burning asphalt produces a large amount of toxic smoke while releasing heat, which will seriously hinder tunnel escape and rescue. [0003] Althoug...

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
IPC IPC(8): C08L95/00C08K3/22C04B26/26
Inventor 吴珂朱凯康诚黄志义
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com