Durability of limestone mortars based on quaternary binders subjected to sulfuric acid using drying-immersion cycles

作者：Makhloufi Z^*; Bouziani T; Hadjoudja M; Bederina M

来源：Construction and Building Materials, 2014, 71: 579-588.

DOI：10.1016/j.conbuildmat.2014.08.086

• Crushed limestone sand
• Limestone filler
• Blast furnace slag
• Natural pozzolana quaternary binders
• Drying-immersion and heating-cooling cycles
• Sulfuric acid
• Weight loss
• Compressive strength loss
• pH

The aim of this work is to produce limestone mortars with blended-cement by substituting partially the clinker by three mineral additions. Namely; the limestone filler, the blast furnace slag and the natural pozzolana combined simultaneously to the cement for rates of 30%, 10% and 10% by turn. The mortar specimens were immersed in sulfuric acid solutions, and subjected to two protocols of attack. The first is slow; it is a continuous immersion. Specimens are exposed to 3% solution of sulfuric acid at 23 1 C. The second protocol is accelerated, and consists to subject the mortar samples to 7 drying-immersion and heating-cooling cycles, followed by a continuous immersion up to 180 days. The drying is done at 60 C and the exposure in lime water and 5% sulfuric acid solution at 23 1 C. In this study the quantification parameters of durability of mortars are the weight loss and the compressive strength loss. The follow-up (the monitoring) of pH of the exposure solutions was carried out until end of the tests. The synergistic action of the quaternary binders has a positive effect vis-a-vis the durability of limestone mortars immersed in sulfuric acid solution and the performances of the limestone mortars with quaternary binders are better than that of the control mortar.

• 出版日期2014-11-30