## 1 Introduction  
During the last decades, environmental concerns related to the manufacturing of ordinary Portland cement (OPC) and to the availability of new materials with the potential to reduce its consumption have driven the use of supplementary cementitious materials (SCMs) as an effective solution to optimize the production of clinker and reduce its large CO\({}_{2}\) emissions [1]. Currently, a wide variety of SCMs is available from the recovery of industrial by-products from biomass waste [2; 3; 4], ornamental industry sludge [5; 6; 7], calcined clays [8], etc. On the basis of the advances on the research on OPC substitution materials, an ambitious goal has been set to reduce the global clinker factor, on average, from 0.78 to 0.60 by 2050 [9]. This requires progress in the development of sustainable alternatives that can contribute to the reduction of the demand for natural resources in the cement industry. More recently, and due to the great problem caused by construction and demolition waste (CDW) [10], some researchers have tried to study the feasibility of using cement-based additions from concrete waste with partial replacement of clinker of cement, although these are still very limited. Recent studies indicate that the fine wastes (<63 \(\upmu\)m) from the crushing and grinding of demolished concrete show chemical compositions similar to those of hydrated Portland cement, with SiO\({}_{2}\) and CaO as the main oxides, as well as other non-hydrated cement particles [11; 12], and calcite (CaCO\({}_{3}\)), which can be attributed to a portion of the carbonated cement paste [13]. These compounds can contribute favourably to the hydration of cement and/or have a filler effect when a given fineness is reached [14]. Studies carried out on cement pastes that incorporated ground concrete waste as a cement replacement also found a reduction in fluidity and a delay in the initial setting time compared to pastes made with conventional cement, due to (i) a lower fineness, (ii) a greater number of larger particles, and (iii) the dilution effect associated with the lower cement content compared to conventional cement [15]. Based on these results, it is recommended that the maximum percentage of incorporation of ground concrete waste is equal to, or less than, 15% by weight. The search to achieve a more energy efficient cement has also led to the joint incorporation of SCMs, in variable quality and quantities, to increase the levels of replacement of OPC with SCM [15; 16]. Some studies have shown that ternary binders, which combine clinker and two SCMs, could reduce the global warming potential associated with cement manufacturing by up to 60% [17]. In line with this, [PERSON] et al. [18] studied the behaviour of ternary mortars incorporating blast furnace slag, fly ash, and limestone. These authors observed that the flexural and compressive strengths of ternary mortars at older ages (>250 days) were slightly higher than those shown by binary mortars and very similar to those of conventional mortars. These findings were justified by the more refined porous structure at older ages (>250 days) of the ternary cementitious matrices with at least one active SCM (slag and/or fly ash) compared to those of the binary or of the conventional mortars. Regarding the use of recycled concrete powder in co-replacement with other additions, [PERSON] et al. [19] studied ternary mortars that incorporated different percentages (10%, 20%, 30%, and 40%) of recycled concrete powder (RCP) in combination with 15% of silica fume (SF) or 15% of fly ash (FA). These authors generally observed that mortars manufactured with up to 20% of RCP had up to 15% lower compressive strength than a conventional mortar at 28 days of curing. However, when 10% of RCP was combined with 15% of SF or with 15% of FA, the compressive and flexural strengths of these mortars were slightly higher than those of the conventional mortar, since RCP has some ability to improve the pozzolanic reactions of SF or FA.