Cutback Asphalt
This article is about highway and transport engineering, this time we talk about the Cutback Asphalt
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pict source : www.hgmeigs.com
Asphalt cement produced from the vacumm steam distillation exists as a semi solid at room temperature, and usually proper workability can be attained by heating the asphalt cement to a temperature of 120 to 165C (25F to 33F) to liquify it. In order for asphalt products to attain workability at room temperature, they must be rendered liquid at room temperature. There are two ways to liquefy asphalt without resorting to heat: dissolve (cut) the asphalt in solvent or emulsify it in water.
When volatile solvent are mixed with asphalt cement to make liquid product, the mixture is called "cutback asphalt." After a cutback asphalt is exposed to air, the volatile solvent evaporates, and the asphalt in the mixture regains its original characteristics (cured). Depending on the volatility of the solvent used, the rate of curing of cutback asphalt can vary from a few news minutes to several days. Following are three types of cutback asphalt and the solvent used.
(source: Wright, P.H, with contributions by James S. Lai, Peter S.Parsonson, Michael Meyer., Highway Engineering, 6th edition ,John Wiley & Sons, Inc.New York, 1996.)
.jpg)
pict source : www.hgmeigs.com
Asphalt cement produced from the vacumm steam distillation exists as a semi solid at room temperature, and usually proper workability can be attained by heating the asphalt cement to a temperature of 120 to 165C (25F to 33F) to liquify it. In order for asphalt products to attain workability at room temperature, they must be rendered liquid at room temperature. There are two ways to liquefy asphalt without resorting to heat: dissolve (cut) the asphalt in solvent or emulsify it in water.
When volatile solvent are mixed with asphalt cement to make liquid product, the mixture is called "cutback asphalt." After a cutback asphalt is exposed to air, the volatile solvent evaporates, and the asphalt in the mixture regains its original characteristics (cured). Depending on the volatility of the solvent used, the rate of curing of cutback asphalt can vary from a few news minutes to several days. Following are three types of cutback asphalt and the solvent used.
- Rapid curing (RC): gasoline or naphtha
- Medium curing (MC): kerosene
- Slow curing (SC): road oils
(source: Wright, P.H, with contributions by James S. Lai, Peter S.Parsonson, Michael Meyer., Highway Engineering, 6th edition ,John Wiley & Sons, Inc.New York, 1996.)
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