## 1 Introduction
One of the main drawbacks of SCC is its cost due to a higher amount of cement and chemical mixtures included in its composition. One of the alternatives to reduce costs of SCC is the use of recycled aggregates [34]. As an alternative to reducing costs, it is possible to replace a part of cement with by-products such as fly ash, slag cement and others. In accordance with EFNARC recommendations, mixtures with ash and addition of mineral and chemical admixtures were cast and all the beams were tested as simply supported beams. Experimental results were quite satisfactory, and the failure mode corresponds to the theoretical models that apply to conventional vibrated concrete [21; 25; 26]. Beams in size of 125 mm \(\times\) 250 mm \(\times\) 1000 mm made of SCC were cast and tested to analyze their flexural behavior [22]. It is proposed in this research to replace the constituent materials by mineral admixtures and to add some chemical admixtures. The percentage of all replacement materials has been worked out from the trial and error method. Lime stone powder was replaced by 10%, class c-fly ash is 20%, silica fume 5% with cement and quarry dust was replaced by 20% of fine aggregates. Results of the tests show that compressive strength of SCC was increased 12.86%, while tensile strength of SCC increased 9.82% compared to conventional concrete. The effect of natural fiber addition on mechanical properties of SCC has been presented in [25]. The mixes were prepared by varying Meta Kaolin (mineral admixture) content from 5% to 15%, with a 5% increment with constant fly ash content of 30%. Nine concrete mixes were made, including the control mix. The conclusion of this investigation was that replacement of cement by mineral admixtures up to 45% (fly ash 30% and meta kaolin 10%) has not affected the fresh state properties of SCC. To evaluate the load capacity of a reinforced concrete beam, a finite element method (FEM) study of the structural behavior of reinforced SCC beam was carried out using the Abaqus FEA modeling tool [30; 32]. The research [30] was based on the validation of two simply supported SCC beams with span of 1800 mm and \(110\times 275\) mm cross section that were loaded monotonically with four-point load. Results indicated that the FEA model matches very well with the experimental responses observed in terms of deformation and load capacities at first crack (difference was 2.3%) and ultimate failure (difference was 7.8%). The conclusion of this research is that the FEA model is capable of simulating the entire loading response of a reinforced concrete beam with reasonable accuracy. The experimental and numerical analysis using Abaqus FEA software was performed by testing sixteen beams made of normal, SCC and high-strength (HS) concrete under pure bending by [PERSON] and [PERSON] [33]. All of the beams were simply supported with of span of 1800 mm and 150 \(\times\) 250 mm cross section. They studied the behavior of RC beams with tension lap splices confined with transverse reinforcement. A good agreement between experimental and numerical results was obtained (difference in ultimate load capacity between experimentally and numerically obtained results was around 20%). Based on the analysis of the experimental studies carried out so far concerning the application of SCC for the construction of structural elements, it is noted that almost all tests were carried out on the simply-supported beams, except for one static system of the two-span continuous beam [27]. Beams were examined both for bending and shear, and their behavior under the effect of short-term static loading corresponds to the behavior of the beams made of conventional VC, as well as to the conditions defined by the regulations for constructions of VC. The main goal of this work was to analyze the flexural performance of SCC continuous beams. The experimental study of three two-span continuous beams of a total length of 3400 mm, with the span between supports of 1600 mm, with 150/200 mm cross section made of SCC, was done.