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Modified natural zeolite warm mixing agent and preparation method thereof

A natural zeolite and warm mix agent technology, applied in the direction of climate change adaptation, etc., can solve the problems that affect the popularization and application of zeolite warm asphalt mixture, reduce the ability of asphalt mixture to resist water damage, and the asphalt and aggregate are easy to peel off, etc. , to achieve the effect of improving water stability, reducing interfacial free energy, and low price

Inactive Publication Date: 2016-06-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high cost and high price of synthetic zeolite lead to a great increase in the cost of existing zeolite warm mix asphalt mixture
Natural zeolite is an inorganic non-metallic mineral material with abundant reserves and low price. It has the same structure as synthetic zeolite, both of which are hydrous framework aluminosilicates, but the internal water content of natural zeolite (less than 10%) is much lower. Compared with synthetic zeolites, the effect of applying natural zeolites as warm mix agents to asphalt mixtures is not good
In addition, since the addition of zeolite has a certain influence on the adhesion between asphalt and aggregate, under the action of water, asphalt and aggregate are prone to peel off, which will reduce the water damage resistance of asphalt mixture.
The existence of these problems has greatly affected the popularization and application of zeolite-based warm mix asphalt mixture.

Method used

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  • Modified natural zeolite warm mixing agent and preparation method thereof
  • Modified natural zeolite warm mixing agent and preparation method thereof
  • Modified natural zeolite warm mixing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A modified natural zeolite warm mixing agent is prepared by the following method:

[0022] (1) Alkaline solution treatment: the raw material of natural zeolite is natural clinoptilolite, the fineness is 200 mesh; 30g of natural clinoptilolite is added to 100ml, 0.5mol / L sodium hydroxide alkali solution, mixed and stirred for 1h, and filtered to obtain Alkali-treated natural clinoptilolite;

[0023] (2) Fatty amine modification: Add 30 g of alkali-treated natural clinoptilolite to a 0.1 mol / L, 100 ml ethanol solution of stearylamine, mix and stir for 1 h, and filter the obtained solid components at a temperature of 80 ° C. Drying for 2 hours under the hood, the modified natural zeolite warm mixing agent was obtained.

[0024] The thermogravimetric (TG) test shows that the water content of natural clinoptilolite in this example is 9%, and the water content of the modified natural clinoptilolite warming agent after alkali treatment is 15%.

Embodiment 2

[0026] A modified natural zeolite warm mixing agent is prepared by the following method:

[0027] (1) Alkali solution treatment: natural zeolite raw material is natural clinoptilolite, fineness is 250 mesh; 25g natural clinoptilolite is added in the sodium hydroxide alkali solution of 100ml, 0.8mol / L, mix and stir 1.5h, filter Obtain alkali-treated natural clinoptilolite;

[0028] (2) Fatty amine modification: add 25g of alkali-treated natural clinoptilolite into 0.15mol / L, 100ml of octadecylamine ethanol solution, mix and stir for 0.5h, and filter the obtained solid component at 78°C Dry at low temperature for 3 hours to obtain the modified natural zeolite warm mixing agent.

[0029] The thermogravimetric (TG) test shows that the water content of natural clinoptilolite in this example is 9%, and the water content of the modified natural clinoptilolite warming agent after alkali treatment is 17%.

Embodiment 3

[0031] A modified natural zeolite warm mixing agent is prepared by the following method:

[0032] (1) Alkaline solution treatment: natural zeolite raw material is natural clinoptilolite, fineness is 300 mesh; 20g natural clinoptilolite is added in 100ml, 1.0mol / L sodium hydroxide alkali solution, mix and stir for 1.5h, filter Obtain alkali-treated natural clinoptilolite;

[0033] (2) Fatty amine modification: Add 20g of alkali-treated natural clinoptilolite into 0.2mol / L, 100ml of octadecylamine ethanol solution, mix and stir for 0.75h, and filter the obtained solid component at 75°C Dry at high temperature for 4 hours to obtain the modified natural zeolite warm mixing agent.

[0034] The thermogravimetric (TG) test shows that the water content of the natural clinoptilolite in this example is 9%, and the water content of the modified natural clinoptilolite warming agent after alkali treatment is 19%.

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Abstract

The invention belongs to the field of road construction materials, in particular relates to a modified natural zeolite warm mixing agent and a preparation method of the modified natural zeolite warm mixing agent. The modified natural zeolite warm mixing agent is prepared by carrying out alkaline solution treatment and fatty amine modification on natural zeolite. According to the modified natural zeolite warm mixing agent disclosed by the invention, the water content of the modified natural zeolite warm mixing agent is higher, so that the mixing and paving temperature of an asphalt mixture can be effectively reduced; a non-polar group of fatty amine in the modified natural zeolite warm mixing agent has very strong affinity with asphalt, and a polar group has very strong affinity with aggregate surfaces (particularly, acidic aggregates such as basalt), so that the interfacial free energy of the aggregates and the asphalt can be effectively reduced, the adhesion of the asphalt and the aggregates is improved, the water stability of the asphalt mixture is increased, and a water damage phenomenon of an asphalt pavement is effectively prevented from happening; raw materials of the modified natural zeolite warm mixing agent prepared by the invention are easy to obtain and low in cost, and the modified natural zeolite warm mixing agent is capable of obviously reducing the cost of a warm mixing asphalt mixture, and is beneficial for being widely applied.

Description

technical field [0001] The invention belongs to the field of road building materials, and in particular relates to a modified natural zeolite warm mix agent and a preparation method thereof. Background technique [0002] Asphalt pavement mainly adopts hot-mix asphalt mixture technology. Hot-mix asphalt mixture is to heat the asphalt to 150-170°C and the mineral material to 180-200°C to ensure the mixing and compaction of the asphalt mixture. Due to the high mixing and compaction temperature of hot mix asphalt mixture, it not only consumes a lot of energy, but also produces a lot of toxic and harmful gases and dust, which seriously endangers the health of construction workers, and aggravates the aging of asphalt, shortening the use of asphalt pavement life. [0003] In order to reduce the energy consumption of hot-mix asphalt mixture and reduce the harm of toxic and harmful gases and dust to the environment, many countries are committed to developing new technologies to redu...

Claims

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Application Information

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IPC IPC(8): C04B14/04C04B20/02
CPCC04B20/023C04B14/047Y02A30/30
Inventor 余剑英尹印陈枭易益徐松
Owner WUHAN UNIV OF TECH
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