### Previous Research  
Research and development in each of these areas has accelerated over the last three decades, and the first two have been widely adopted across the entire cement industry. The development of alternative (non-Portland) clinkers shows great promise for the near future, but the adoption of CCS remains somewhat slower than might be hoped. This paper reports the first application of thermodynamic modelling in the clinker-slag-limestone-glass system of blended cements and demonstrates how this approach allows the rapid comparison of blended cement formulations. In this way, subsequent experimental studies may be focused on the most promising compositions. [PERSON] et al. [6] found, through XRD, that the addition of glass powder increases the dissolution rate of Portland cement with a corresponding acceleration of clinker hydration. XRD analysis undertaken by [PERSON] and co-workers [7] found high silica content along with portlandite and calcite, which were found to contribute positively to the compressive strength in cement mortars cast as part of the study up to 28 days, which indicates that the reactivity of the RCGP peaked before then. However, with increasing RCGP additions, workability decreased. Similar effects on workability were found by [PERSON] et al. [8]. The replacement of glass powder in cement will increase the early compressive strength significantly and might reach 20%, after 7 days; however, there is no significant increase in compressive strength after 28 days, which means that the glass powders reactivity slows over time due to its amorphous nature. [PERSON] and [PERSON] [9] undertook XRD on blended RCGP with OPC and found crystalline clinker phases, portlandite and C-S-H. RCGP was found to exhibit a high amorphous peak between 15\({}^{\circ}\) and 35\({}^{\circ}\) 20, with no clear crystalline trends observed. Similar peaks were observed by [PERSON] et al. [10] and [PERSON] et al. [8]. In contrast to [PERSON] et al. [7], RCGP did not show significant early-age strength with a substantial strength development at 56 days. However, beyond a 10% replacement level, the compressive, flexural and tensile strength decreased. The researchers concluded that RCGP is a suitable cement replacement up to 10%, but long-term curing and a finer particle size distribution are mandatory for the successful use of RCGP with higher replacement levels. XRD analysis by [PERSON] et al. [10] on mortar samples with different RCGP additions typically found portlandite, quartz and calcite peaks at lower replacement levels. At 30% RCGP replacement, no portlandite was observed, which indicates pozzolanic behaviour. The observed presence of clinker phases revealed hydration was still ongoing, which may suggest that the addition of RCGP slows down clinker dissolution. These findings support the authors' conclusion that the addition of glass powder improved the overall strength and chloride penetration because of observed pozzolanic behaviour in XRD, SEM and TG analysis. The effect of recycled waste glass powder as a partial replacement of cement in concretes containing silica fume and fly ash by [PERSON] [11] found that a 5% replacement demonstrated an increase in compressive and tensile strengths of ordinary concrete, but this was lowered when added to silica fume and fly ash concretes. [PERSON] et al. [12] combined glass powder with Portland cement to stabilize dredged sediment. They found that it did help stabilize the sediment, with strength increased with ongoing curing age, glass fineness and water content. It was also found to improve density. [PERSON] et al. (2013) found that the presence of 40 wt% recycled glass powder in a binder significantly mitigated ASR by reducing OH\({}^{-}\) concentration and limiting alkali ingress, despite a lower strength gain. They also concluded that there is a 36% lowering of CO\({}_{2}\) with a 40 wt% addition. The greatest immediate CO\({}_{2}\) saving is in clinker replacement, using pozzolanic materials as SCM additions.