###### Abstract  
The addition of ground olive stones in the manufacture of mortar bricks reduces their thermal conductivity coefficient and increases heat exchange insulation. So, it can improve energy efficiency and reduce the energy demand of buildings. This research analyzes, from other points of view, the economic, social and environmental impacts of the doping of GERO mortar bricks with ground olive stone in a percentage between 5% and 15% by volume of fine aggregate for use in building construction. The study focuses mainly on the region of Andalusia, Spain, where large quantities of olive stones are collected as waste from olive oil production. The economic analysis shows how the use of ground olive stones as a partial replacement of fine aggregate in mortar can generate significant savings and economic returns in the medium term (10-20 years) by reducing conventional energy consumption in heating and air conditioning installations. Finally, the Environmental Life Cycle Analysis shows that the use of ground olive stones in GERO perforated bricks reduces environmental impacts in the medium term. In summary, the research concludes that the doping of mortar bricks with ground olive stones can have a positive impact on the economy, society and the environment, and represents a sustainable and cost-effective alternative for the construction industry. ground olive stone; doped mortar; circular economy; sustainable construction; Social Life Cycle Analysis; Environmental Life Cycle Analysis +
Footnote †: journal: Applied  
modify their physical properties and improve their performance. Doped materials can help reduce heat loss and the amount of energy required to heat or cool a building. Among the current materials for the doping of mortar are the wastes from industrial and agricultural processes of human activity. In this way, it is possible to give a new use to those elements that in a traditional way would have been disposed of in landfills without any kind of previous treatment. Several studies have been carried out on the doping of mortars with residues. For instance, plastics of different origins and compositions have been used [6; 7]; The recycling of end-of-life tires [8; 9], through the creation of crumb rubber to replace fine aggregate in bricks and hollow bricks. This reduces the temperature gradient by 5.6% between inside and outside [8]; Wastes from blast furnace [10]; Sludge generated by the pulp and paper industry [11], highlighting that the incorporation of 10% of the waste in soil-cement blocks reaches the minimum technical requirements demanded by the regulations; Ceramic waste bricks, tiles and roof tiles from the demolition of buildings [12], improving the compressive strength over that of natural aggregate. Additional examples are agricultural residues such as: barley fibers [13], banana leaf ashes and fibers [14], peanut shells [15], cork particles [16], sawdust ashes [17], sugar cane bagasse ashes [18], rice hus ashes [19], olive ashes [20] and rice husks [21]. In the last case, it is noted that replacing 7% of the sand with rice husks reduces the thermal conductivity by 12%. Once the great projection for the future in the incorporation of waste from industrial and agricultural activities has been explained, it is evaluated for the specific case of Spain, where a waste with great potential from the food industry, such as ground olive stone, is used. This has already been evaluated by previous researchers, where they show its mechanical viability as a substitute for fine aggregate in mortars [22; 23; 24]. For instance, the research by [PERSON] et al., studied the mechanical properties of mortars in which ground olive stones is used as a substitute for fine aggregate in percentages from 0% to 50% and even up to 100% substitution, in increments of 5%. Their results show significant decreases in the mechanical properties (compression and flexural) of the mortars as the percentage of use of ground olive stone increases.