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Wednesday, 16 October 2019
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Raw materials & technologies, Applications

Using layered double hydroxides to reduce VOCs from bituminous materials

Friday, 8 July 2016

The VOC emissions of various types of molecules from bituminous materials were detected and analysed by means of thermogravimetric-mass spectrometry (TG-MS) analysis.

With layered double hydroxides a decrease of 40–60% in VOC emissions can be achieved. Source: Rainer Sturm/pixelio.de

With layered double hydroxides a decrease of 40–60% in VOC emissions can be achieved. Source: Rainer Sturm/pixelio.de

The effect of layered double hydroxides (LDHs) additives as VOCs inhibitor was also studied.

Ion histogram of VOC components

The ion histogram of volatile components from bituminous binder was obtained through TG-MS analysis. Analysis results show that the environmental temperature has significant influence only on the volatile characteristics of smaller molecules in the pure bituminous binder. The effect of environmental temperature has been found marginal for the volatile speed of bigger molecules and LDHs modified bitumen binder.

Emission decrease of 40–60% can be achieved

The obtained results regarding the pure bitumen and LDHs-modified bitumen demonstrate that LDHs modifiers have the potential to reduce VOC emissions. The reduction effect on different molecules or components varies. For smaller molecules, this effect on volatile speed is significant. LDHs affect the volatile speed of more carcinogenic volatile components to reduce more significantly for dichloroethane and naphthalene, compared with normal octane. The study findings indicate that a LDH percentage of 4% is an optimum for achieving the best emission reduction effect of VOCs for the selected binder, which is 40–60% percent reduction in VOCs.

The study is published in: Construction and Building Materials, Volume 123, 1 October 2016, Pages 69–77

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