## 1 Introduction  
Self-consolidating concrete (SCC) is a unique type of special concrete, often called self-leveling concrete, self-compacting concrete, or super workable concrete [1]. Widely applied in bridges, buildings, and infrastructure [2], SCC distinguishes itself from conventional concrete by deforming with minimal external energy, eliminating the need for manual compaction during placement [3]. The concept originated in 1986 with Prof. [PERSON]'s proposal in Japan, later implemented by [PERSON] in 1988 at the University of Tokyo [4; 5; 6], aiming to address poor performance in concrete structures attributed to placement methods [7]. Comprising cement, fine and coarse aggregates, and water, SCC achieves its desired properties through admixtures such as superplasticizers [8], ensuring good rheology and workability [9]. SCC provides advantages, including time and machinery cost savings and reduced skilled labor expenses [10]. However, its material cost is typically 20-50% higher due to increased binder and admixture requirements [11]. The sustainability of traditional SCC is compromised by the expense and environmental impact associated with higher dosages of cement. To address the imperative to reduce carbon emissions from clinker/cement production, alternative building materials with lower cement content have emerged. Developing such materials has been challenging due to the unique properties of cement and the necessity for global cost-effective production. A promising solution is limestone calcined clay cement (LC\({}^{3}\)) [12]. LC\({}^{3}\)-50, incorporating gypsum (5%), limestone (15%), calcined clay (30%), and clinker (50%), has demonstrated success in replacing traditional pozzolana cement [12; 13; 14]. LC\({}^{3}\)'s introduction has saved energy in clinker production, as noted by [PERSON] et al. [15] and [PERSON] et al. [16]. This innovative cement can be adapted to SCC production with suitable admixtures. However, supplementary cementitious materials like limestone and calcined clay impact LC\({}^{3}\)'s fresh properties. For example, [PERSON] et al. [17] found that calcined clay increased static and dynamic yield stress, initial thixotropic index, plastic viscosity, and cohesion, while limestone had an opposite effect. Recently, [PERSON] et al. [18] utilized machine learning to predict LC\({}^{3}\)'s yield stress. Understanding LC\({}^{3}\)'s rheological properties is crucial for controlling fresh properties and enhancing applications like SCC. In addition to various chemical admixtures, cost-effective and environmentally friendly organic extracts can be utilized to impact the properties of fresh (and hardened) concrete. The growing need to enhance concrete quality has driven interest in green concrete, as conventional chemicals are costly and non-biodegradable. These eco-friendly products can be derived from plants, animals, or both. The selection of the eco-friendly admixtures and their impact on the properties of SCC and concrete are summarized in Table 1. [PERSON] et al. [19] studied SCC with gum Arabic from acacia trees, finding that its addition (8% of the weight of cement) maintained low water demand but resulted in a relatively reduced compressive strength. Starch, employed as a viscosity-modifying agent in SCC, was observed to retard setting time with minimal impact on compressive strength [20; 21]. Aloe vera mucilage (AVM), obtained from the leaves of the aloe vera plant, emerges as another promising admixture. This succulent plant, thriving in semi-arid and arid regions, has long been utilized globally in cosmetics and medicinal applications [22; 23]. Reports indicate that its addition to concrete improves workability, compressive strength, and corrosion inhibition [24; 25], as well as facilitating the formation of porous concrete [26]. However, the effects of AVM on rheology and its water-reducing impact in the production of green SCC prepared from LC\({}^{3}\) remain unclear.