Abstract

NOx De-Pollution Using Innovative Mortars and Concretes - From Garage Prototypes to Tunnel Pilot

Highlights

  • Hazardous gaseous pollutants, such as nitrogen oxides (NOx), are mainly produced by car and truck traffic

  • By comparing the concentrations measured at the input and output of the garage, no significant absorption of NO2 was detected in the garage, while an abatement of 20-25% was observed in the garage made of activated carbon concrete, whatever the weather conditions and even in presence of other pollutants released by the generator

  • The results showed almost no nitrate or nitrite in the leachate from the reference concrete and significant levels of nitrates and nitrites in the leachate coming from the activated carbon concrete yet below the water quality standards [11]

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Summary

Introduction

Hazardous gaseous pollutants, such as nitrogen oxides (NOx), are mainly produced by car and truck traffic. They affect the health of millions of people by worsening allergic, respiratory and cardiovascular diseases [1,2]. The objectives of this paper consist in presenting: (i) the NO2 reduction rates in instrumented garage boxes built with de-polluting building materials (ii) the results of a field test undertaken in the ventilation plant of a chimney of a motorway tunnel. Laboratory-scale experiments show that the addition of small percentages of activated carbon (AC) powder to the cement paste increases the NO2 reduction rate and reduces the influence of carbonation, by prolonging the de-polluting effect. - Reaction of the adsorbed NO2 with the alkaline pore solution of the surrounding cement paste, which depend on its carbonation

Pilot tests done in parking boxes
Improvement of the NO2 abatement with a depolluting spray mortar
Spray of the de-polluting mortar on the walls of the ventilation plant
Results one month before and after mortar application
Results measured five and seven months after the application of the mortar
Error measurement assessment The fiability of the measurements with the
Findings
Conclusion

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