In recent years, advanced concrete materials are the prime scientific interest in the composite engineering area. Ultra-High-Performance Fiber Reinforced Concrete (called UHPFRC or UHPC), the most complex advanced concrete, cannot be used in real-world applications relying exclusively on the current design codes devised for the normal, and high strength.
The cost of the UHPC premix can be dozen times more expensive than the normal or high-strength concrete. Therefore, locally developing the UHPC is so beneficial in cost-saving. However, UHPC using local materials has some drawbacks on its mechanical properties compared to the premix UHPC.
The present study proposes an ultra-careful approach to predicting the elastic modulus of UHPC, that uses local materials, which is the most sensitive parameter in designing concrete. The compressive behavior of 104 lab-cast UHPC cylindrical specimens is first investigated according to ASTM 469/C469M‐14 and ASTM C39/C39M-18. Secondly, various predictive equations for the elastic modulus of UHPC are proposed. In addition, an equation for the failure strain was introduced for a better fit with the experimental data.
Existing theoretical equations, although overestimate or underestimate the obtained experimental elastic modulus and failure strain, respectively, have been referred to for the estimation and validation of the newly proposed predictive equations.
The experimentally proposed equations for the elastic modulus although they present better standard deviations and good means; however, they still showed a very low coefficient of determination (R2). Two proposed equations are recommended for further prediction of the elastic modulus and failure strain of UHPC using local materials.

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