Effect of the sulfate content in stabilizied soils using alternative cementitious materials
Document typeMaster thesis
Rights accessRestricted access - author's decision
The urge to use more environmentally friendly construction materials has motivated the boost of initiatives which intend to reduce the high levels of pollution that construction materials generate in their manufacturing. A good example of this is the Paper Chain European initiative, which aims to find different innovative ways to use the waste streams generated by the Pulp and Paper Industry. More in particular, it consists on focusing on the valorization of ash produced in the energy recovery from paper waste, produced by recycling pulp mills as alternative binder for soil stabilization works in road projects. This new material, a sall waste used in civil engineering, needs to be assessed and understood so it can be properly used under different conditions. For this reason, new alternative procedures are proposed in this project thesis to study its behavior. The result of all the tests will give a comprehensive idea of the pros and cons that the use of this material may cause in comparison to the most historically used material in soil stabilization, cement. The most important issue to analyze is the possible formation of ettringite or thaumasite minerals in the pavement structure, which is the main cause of heave that takes place inroads mainly due tosulfate attack circumstances. Different tests have been carried out to assess this issue, under different temperature and sulfateattack conditions.
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