Investigation of the engineering properties of mortars produced using asphalt waste and pumice powder under the effect of acid

Asphalt pavements are important materials that form the road superstructure and create waste by being excavated for renewal works at the end of their service life. Considering the economic and environmental advantages of these wastes, the use of Recycled Asphalt Waste (RAW) provides benefits such as energy saving, reduction of environmental pollution and costs, and reduction of landfill areas. In this experimental study, the engineering properties of Ground Pumice Powder (GPP) added mortars produced with RAW under the influence of Hydrochloric Acid (HA) were investigated. CEM I 42.5/R type portland cement was used as binder material, GPP as mineral additive, 0-4 mm crushed sand and RAW as aggregate. GPP was replaced with cement at 10%, 20% and 30% by weight, and RAW was replaced with crushed sand at 0%, 25%, 50%, 75% and 100% by weight. Spreading, water absorption and porosity, unit volume weight, ultra sound, capillary water absorption, electrical resistivity and bending-pressure tests were carried out on the produced mortar samples with dimensions of 40x40x160 mm in 7, 28 and 90 days. In order to examine the physical and mechanical changes that occur as a result of exposure to HA acid attack with a concentration of 5% by volume, bending-pressure, water absorption and porosity, unit volume weight experiments were applied at the end of the 7th, 28th and 90th days. As a result, the ideal ratio was reached by using 10% of GPP and 25% of RAW. In addition, it seems that the use of both mineral additives and waste aggregate in mortars will be effective in reducing pollution in the environment. It has been revealed that durability under the influence of HA acid is very important for durability and strength in mortar samples.