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Composite modified emulsified asphalt and preparation method thereof

A technology of emulsified asphalt and composite modification, which is applied in the fields of climate change adaptation, building components, building insulation materials, etc., and can solve problems such as poor storage stability of emulsified asphalt, unsatisfactory high and low temperature performance, and weak polarity

Active Publication Date: 2021-06-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of tests have proved that when the content of SBS is low, its effect on improving the road performance of emulsified asphalt is limited
Modified emulsified asphalt with low SBS content has unsatisfactory high and low temperature performance. In areas with hot summer and cold winter, it is easy to cause cracks, potholes and other diseases on the road surface
When the content of SBS is high, the viscosity of SBS-modified asphalt is high, and it is not easy to emulsify, and the polarity of SBS is weak, and the compatibility with base asphalt is poor, so that the prepared emulsified asphalt has poor storage stability. , its application is limited

Method used

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  • Composite modified emulsified asphalt and preparation method thereof
  • Composite modified emulsified asphalt and preparation method thereof
  • Composite modified emulsified asphalt and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0029] The preparation method of SBS / PPA composite modified emulsified asphalt is carried out according to the following steps:

[0030] Step 1: Heat the base asphalt to 150°C-160°C, then add glycerol triglycidyl ether, stir for 15min-20min and then shear at a speed of 3500r / min-4000r / min at a temperature of 160°C-170°C 40min to 50min to prepare mixture A;

[0031] Step 2: Add the SBS modifier to the mixture A, stir evenly and put it in an oven at 140°C-150°C to swell for 40min-50min. Cut at a speed of 15 min to 25 min, and then cut at a speed of 4000 r / min to 4500 min for 40 min to 60 min to prepare mixture B;

[0032] Step 3: Add polyphosphoric acid to mixture B, stir for 15min-25min, and then develop in an oven at 150°C-160°C for 40min-50min to prepare SBS / PPA composite modified asphalt for emulsification;

[0033] Step 4: Add polyvinyl alcohol, add hot water at 65°C to 70°C and stir evenly; then add methyl cellulose and compound emulsifier in sequence, and use industrial...

Embodiment 1

[0050] Example 1: SBS / PPA composite modified emulsified asphalt

[0051] The SBS / PPA composite modified emulsified asphalt given in this example is composed of the following raw materials in terms of mass fraction: 56% of base asphalt, 2.5% of SBS modifier, 0.06% of polyphosphoric acid, glycerol triglycidyl ether (GPE) 0.8%, composite emulsifier 1.1%, stabilizer 0.24% (polyvinyl alcohol 0.12, methyl cellulose 0.12%), balance is water, and the sum of the mass fractions of raw materials is 100%.

[0052] The preparation method of the above-mentioned SBS / PPA composite modified emulsified asphalt is carried out according to the following steps:

[0053] Step 1: Heat base asphalt to 152°C, add glycerol triglycidyl ether, and shear at 170°C for 43 minutes at a speed of 4000r / min after stirring for 15 minutes to prepare mixture A.

[0054] Step 2: Add the SBS modifier to the mixture A, stir evenly and put it in an oven at 150°C to swell for 43min. Under the condition of 175°C, first...

Embodiment 2

[0059] Example 2: SBS / PPA composite modified emulsified asphalt

[0060] The SBS / PPA composite modified emulsified asphalt given in this embodiment is composed of the following raw materials in terms of mass fraction: 58% of base asphalt, 2.6% of SBS modifier, 0.07% of polyphosphoric acid, glycerol triglycidyl Ether 0.9%, compound emulsifier 1.2%, stabilizer 0.2% (polyvinyl alcohol 0.10%, methyl cellulose 0.10%), the balance is water, and the sum of the mass fractions of raw materials is 100%.

[0061] The preparation method of the above-mentioned SBS / PPA composite modified emulsified asphalt is carried out according to the following steps:

[0062] Step 1: Heat base asphalt to 160°C, add glycerol triglycidyl ether, and shear at 168°C for 48 minutes at a speed of 3500r / min after stirring for 20 minutes to prepare mixture A.

[0063] Step 2: Add the SBS modifier to the mixture A, stir evenly and put it in an oven at 140°C to swell for 40min. Under the condition of 178°C, first...

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Abstract

The invention discloses composite modified emulsified asphalt and a preparation method thereof. The composite modified emulsified asphalt is prepared from the following raw materials: matrix asphalt, an SBS (Styrene Butadiene Styrene) modifier, polyphosphoric acid, glycerol triglycidyl ether, a composite emulsifier, a stabilizer and water. The preparation method comprises the following steps: heating matrix asphalt, adding glycerol triglycidyl ether, conducting stirring, and conducting shearing to obtain a mixture A; adding an SBS modifier into the mixture A, uniformly conducting stirring, conducting swelling, carrying out low-speed shearing, and carrying out high-speed shearing to obtain a mixture B; adding polyphosphoric acid into the mixture B, conducting stirring, and conducting developing in a drying oven to prepare composite modified asphalt for emulsification; adding a stabilizer and a compound emulsifier into water, uniformly conducting mixing, and regulating the pH value to 2-3 by using industrial hydrochloric acid to prepare liquid soap; heating the liquid soap and keeping the temperature; and adding the composite modified asphalt into the soap liquid, and conducting emulsifying to obtain the composite modified emulsified asphalt. The composite modified emulsified asphalt has the advantages that the solid content is high, the storage stability is good, the elastic recovery capability is relatively strong, and the high-temperature and low-temperature performances are excellent.

Description

technical field [0001] The invention belongs to the field of road building materials, and relates to a composite modified emulsified asphalt and a preparation method thereof. Background technique [0002] In recent years, with the vigorous promotion of green transportation and smart transportation construction and the arrival of the peak period of road surface maintenance, emulsified asphalt that is safe, energy-saving, and environmentally friendly has become more and more popular among engineers and technicians. However, with the surge of traffic volume, the load on the pavement is constantly increasing, which makes people put forward higher requirements on the performance of pavement materials. Studies have shown that the composition and structure of asphalt determine that it has the defects of easy flow at high temperature, brittleness at low temperature, and poor elastic recovery ability. Therefore, ordinary emulsified asphalt cannot meet the needs of asphalt pavement. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L71/02C08L77/00C08K3/32C08K5/1515C08K5/19C08K5/20C08K13/02
CPCC08L95/00C08L2207/04C08L2205/035C08K2003/329C08L53/02C08L71/02C08L77/00C08K3/32C08K5/1515C08K5/19C08K5/20C08K13/02Y02A30/60
Inventor 杨永强伍思豫冯松张洪涛李军郭海东马玉安
Owner CHANGAN UNIV
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