Accelerated leaching of cementitious materials using ammonium nitrate (6M): influence of test conditions

Stéphane Poyet (1) , Patrick Le Bescop (1) , Magalie Pierre (1) , Laure Chomat (1) , Cécile Blanc (2)

1 LECBA - Laboratoire d'Etude du Comportement des Bétons et des Argiles
2 LISL - laboratoire d'ingénierie des surfaces et lasers

We have focused on the test conditions influence on accelerated degradation of cementitious materials using ammonium nitrate. PH-buffering and renewal of the leaching solution were studied. PH-buffering appeared not to be very important when the renewal pH remains under eight. Renewal appeared to be the most influential feature. Its absence leads to calcium accumulation in the leaching solution inducing aggressiveness fall. Degradation is then less marked in terms of depth, flux and mineralogy. The resulting porosity increase is also smaller.

Keywords: cementitious materials; accelerated degradation; ammonium nitrate; protocol influence

Domains: Engineering Sciences [physics]; Civil Engineering; Génie civil nucléaire; Engineering Sciences [physics]; Materials; Engineering Sciences [physics]; Civil Engineering

Stéphane Poyet, Patrick Le Bescop, Magalie Pierre, Laure Chomat, Cécile Blanc. Accelerated leaching of cementitious materials using ammonium nitrate (6M): influence of test conditions. European Journal of Environmental and Civil Engineering, 2015, 16, pp.336 - 351. ⟨10.1080/19648189.2012.667712⟩. ⟨cea-03293603⟩