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Bentonite composition modified asphalt and its preparing method

A technology of modified asphalt and bentonite, which is applied in the direction of building structure, building components, building insulation materials, etc., can solve the problems of insignificant improvement of high temperature performance, expensive SBR, affecting the uniformity of asphalt, etc., and achieve low temperature anti-cracking performance And good anti-aging performance, high and low temperature performance improvement, and the effect of improving road performance

Inactive Publication Date: 2005-03-02
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic and foreign studies have shown that the use of polymer materials to modify asphalt has the characteristics of reducing the temperature sensitivity of asphalt materials, increasing the softening point and improving anti-aging performance; such as SBS modified asphalt, due to the excellent elasticity of SBS materials, low temperature resistance Performance and plasticity at high temperature, easy asphalt blending, making the elongation of SBS modified asphalt 150%, self-recovery after imperial loading, good adaptability to structural deformation, and significantly improved crack resistance; but domestic The SBS finished products produced by foreign institutes are all granular. However, for this highly plastic material, even if it is heated to a very high temperature, its inherent elasticity still greatly affects the uniformity of asphalt after repeated mixing; on the other hand, SBS Modified asphalt is expensive
Although the low-temperature performance of modified asphalt can be significantly improved with SBR modified asphalt, the improvement of high-temperature performance is not obvious, and the price of SBR is also relatively expensive.

Method used

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  • Bentonite composition modified asphalt and its preparing method
  • Bentonite composition modified asphalt and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: first calcium-based bentonite is selected for soil removal and sand removal, the bentonite after sand removal is dried, ground after drying and sieved with a 325 mesh sieve, and then 1 part of sieved bentonite is added to 94 parts of molten matrix pitch, And keep stirring to avoid local overheating. While stirring, add 3 parts of powdered styrene-butadiene rubber, keep the temperature at 170°C and high shear at a shear rate of 4000 rpm / min, and stir in an asphalt emulsifier for 50 minutes to make it evenly mixed to obtain modified asphalt. The measured 5-degree ductility (5cm / min, 5°C, cm) is 164, the 25-degree penetration (25°C, 100g, 5s, 0.1mm) is 63, and the softening point (°C) is 56; rotating film oven test (RTFOT) 5-degree ductility (5cm / min, 5°C, cm) was 67, and the penetration ratio (%) was 84.

[0020] Depend on figure 1 It can be seen that the softening point and low temperature ductility of asphalt are improved, and the high and low temperatur...

Embodiment 2

[0022] Embodiment 2: First, the calcium-based bentonite is selected for soil removal and sand removal, and the bentonite after sand removal is dried. After drying, it is ground and sieved with a 325-mesh sieve, and the bentonite obtained by the sieve is organically activated with a quaternary ammonium salt. , so that the interlayer spacing increases, which is conducive to the easier insertion of some substances in the asphalt, and then add 3 parts of sieved organic bentonite to 96 parts of molten base asphalt, and keep stirring to avoid local overheating. While stirring, add 1 part of powdered styrene-butadiene rubber, keep the temperature at 180°C and high shear at a shear rate of 4500 rpm / min, and stir in an asphalt emulsifier for 40 minutes to make it evenly mixed to obtain modified asphalt. The measured 5-degree ductility (5cm / min, 5°C, cm) is 160, the 25-degree penetration (25°C, 100g, 5s, 0.1mm) is 62, and the softening point (°C) is 56; rotating film oven test (RTFOT) 5...

Embodiment 3

[0023] Embodiment 3: earlier calcium-based bentonite is carried out to select soil desanding, the bentonite after desanding is used sodium salt (Na 2 CO 3 or NaHCO 3 etc.) for sodiumization, after drying, grind and sieve with a 325-mesh sieve, then add 1.5 parts of sieved bentonite to 98 parts of molten base asphalt, and keep stirring to avoid local overheating. While stirring, add 2.5 parts of powdered styrene-butadiene rubber, keep the temperature at 190°C and high shear at a shear rate of 6000rpm / min, stir in an asphalt emulsifier for 30 minutes, and mix evenly to obtain modified asphalt. The measured 5-degree ductility (5cm / min, 5°C, cm) is 65, the 25-degree penetration (25°C, 100g, 5s, 0.1mm) is 67, and the softening point (°C) is 55; rotating film oven test After (RTFOT), the 5-degree ductility (5cm / min, 5°C, cm) was 45, and the penetration ratio (%) was 80.

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Abstract

The bentonite composition modified asphalt consists of asphalt in 94-98 portions, bentonite in 1-3 portions and powdered styrene-butadiene rubber in 1-3 portions. The bentonite is at least one of calcium base bentonite, sodium bentonite and organic bentonite. The preparation process of the bentonite composition modified asphalt includes the following steps: eliminating sand in bentonite, drying, grinding and 325-mesh sieving bentonite; adding bentonite into the asphalt matrix; and adding powdered styrene-butadiene rubber while slowly stirring to mix homogeneously. The modified asphalt has the features of high temperature stability, low temperature cracking resistance, excellent anti-ageing performance, low cost, etc.

Description

Technical field [0001] The invention relates to a bentonite composition modified asphalt and a preparation method thereof. Background technique [0002] There have been many years of history of modifying asphalt with polymers abroad, and there are many kinds of polymers that can be used as asphalt modifiers, which are generally divided into rubber, resin and rubber resin. Rubber modifiers include natural rubber (NR), styrene-butadiene rubber (SBR), polychloroprene (CR), acrylonitrile-butadiene polymer (ABR), polystyrene-isoprene copolymer For vulcanized rubber, it must be regenerated before it can be used as a modifier. Resin modifiers are divided into thermosetting and thermoplastic resins. The former has ethylene-vinyl acetate copolymer (EVA), polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinyl acetate, etc., and the latter has epoxy resin. Resin, phenolic resin, etc. Rubber resin modifiers include styrene-butadiene-styrene copolymer (SBS), styrene-i...

Claims

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Application Information

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IPC IPC(8): C08K3/34C08L95/00
Inventor 王云普刘小军李玉峰张继裴小维王有朋刘东杰
Owner NORTHWEST NORMAL UNIVERSITY
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