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Foam warm mix asphalt capable of improving water stability of mixture and preparation method of foam warm mix asphalt

A water-stabilized, warm-mix asphalt technology, which is applied to ceramic products, building insulation materials, and other household appliances, can solve the problems of increasing the moisture sensitivity of the mixture and reducing the water stability of the foamed warm-mix asphalt mixture. Achieve the effects of improving water stability, enhancing adhesion performance, and enhancing cohesive work

Pending Publication Date: 2018-09-14
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the water in the foamed asphalt cannot evaporate completely during the mixing process, and some of the water and air bubbles may remain in the cement. Although the foamed asphalt has a high degree of adhesion to the aggregate, the particle bubbles in the cement , Moisture will increase the moisture sensitivity of the mixture
On the other hand, the dryness of the aggregate also has a great influence on the water stability of the mixture. The heating temperature of the aggregate in the foamed warm mix asphalt mixture is low, and the water in the aggregate may not evaporate completely. - The adhesion of asphalt has a certain influence, resulting in the reduction of the water stability of foamed warm mix asphalt mixture

Method used

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  • Foam warm mix asphalt capable of improving water stability of mixture and preparation method of foam warm mix asphalt
  • Foam warm mix asphalt capable of improving water stability of mixture and preparation method of foam warm mix asphalt
  • Foam warm mix asphalt capable of improving water stability of mixture and preparation method of foam warm mix asphalt

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1. Preparation of foamed warm mix asphalt

[0022] The foamed asphalt is made of water, base asphalt, and cetyl trimethyl ammonium bromide, wherein the amount of water is 1% to 3% of the mass of the base asphalt, and the amount of cetyl trimethyl ammonium bromide is the base asphalt 0.5% to 1.25% of the mass, follow the steps below:

[0023] (1) Heat the base asphalt to a molten state (130°C-160°C), and then pour it into the asphalt tank of the foaming machine, and the asphalt in the asphalt tank starts to circulate under the drive of the circulation pump;

[0024] (2) Add cetyltrimethylammonium bromide with 0.5% to 1.25% of the asphalt quality to the asphalt in the asphalt tank, and use a glass rod to stir for 3 to 5 minutes, and then let the hot asphalt flow under the drive of the circulation pump for 5 minutes Foam again for ~7 minutes to promote cetyltrimethylammonium bromide and asphalt to mix evenly until the asphalt reaches the foaming temperature, and the foami...

Embodiment 2

[0036] 1. Preparation of asphalt mixture

[0037] Take the foamed warm-mix asphalt samples 1-5 prepared in Example 1, and prepare 5 parts of asphalt mixture respectively. The raw materials used are as follows:

[0038] Asphalt: Foamed warm mix asphalt sample;

[0039] Mineral materials: limestone, limestone powder; mineral materials include limestone (particle size greater than 0.075mm), limestone powder (particle size less than 0.075mm)

[0040] Mineral material gradation: AC-13 type

[0041] Oil-stone ratio: 4.7-5.0% (that is, the weight of foam warm-mix asphalt: the weight of mineral aggregate is 4.7-5.0%). The "stone" in the oil-stone ratio refers to mineral material (the sum of the mass of limestone and limestone mineral powder), and oil refers to foam Warm mix asphalt.

[0042] The steps for preparing asphalt mixture are as follows:

[0043] (1) Heat the mineral material to 140℃~150℃, and stir in the stirring pot for 90s to achieve the purpose of uniform mineral mate...

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Abstract

The invention discloses foam warm mix asphalt capable of improving water stability of a mixture. The asphalt is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 1-3 parts of water, and 0.5-1.25 parts of cetyl trimethyl ammonium bromide. The invention also discloses a preparation method of the foam warm mix asphalt; and the preparation method comprises thefollowing steps: (1) heating the matrix asphalt to a molten state, pouring the molten asphalt into an asphalt tank of a foaming machine, and performing circulating flow; (2) adding the cetyl trimethylammonium bromide into the matrix asphalt of the asphalt tank, and performing uniform mixing under stirring; and (3) when the asphalt reaches foaming temperature of 150-170 DEG C, giving a foaming instruction to the foaming machine, and pouring water into the hot asphalt for foaming to obtain the foam warm mix asphalt. According to the method disclosed by the invention, the cetyl trimethyl ammonium bromide is added into the asphalt to modify the foam asphalt, so that cohesive work of the asphalt is reinforced; and the cetyl trimethyl ammonium bromide is added, so that the adhesion of the aggregate-asphalt is reinforced, and water stability of the foam warm mix asphalt mixture is improved.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a foam warm-mix asphalt for improving the water stability of a mixture and a preparation method thereof. Background technique [0002] Foamed warm mix asphalt mixture is a pavement material that uses low-viscosity foamed asphalt to mix aggregates. It can achieve mixing and compaction at relatively low temperatures. It only needs a small amount of water during the foaming process, which has economical and environmental advantages. . However, the foaming effect of most asphalt is not ideal, and the moisture in the foamed asphalt cannot evaporate completely during the mixing process, and some moisture and air bubbles may remain in the asphalt, which increases the moisture sensitivity of the mixture and causes The adhesion between the aggregate interface and the foamed asphalt decreases, which eventually leads to the damage of the water stability of the foamed warm mix asph...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08K5/19C08J9/08C04B26/26C04B38/10
CPCC04B26/26C04B38/106C08J9/08C08J2203/02C08J2395/00C08K5/19C04B14/28Y02A30/30
Inventor 郭鹏唐伯明曹雪娟何丽红韦万峰冯云霞高云何圳谢凤章战琦琦
Owner CHONGQING JIAOTONG UNIVERSITY