Abstract: A polymer-modified hybrid-fibers cementitious composition has a one-day compressive strength of at least approximately 17 MPa, a 28-day tensile strength of at least approximately 3.8 MPa, an ultimate tensile strain of approximately 3% to approximately 9%, and a 7-day bond strength of at least approximately 2.3 MPa. A binder of ordinary Portland cement, fly ash, and silica fume is provided. Other components include limestone powder, sand, superplasticizer, and water. The composition further includes one or more of styrene butadiene rubber or ethylene-vinyl acetate copolymer in an amount ranging between approximately 2% and approximately 8% by mass of binder. Fiber additives include steel fibers in an amount ranging between approximately 0.3% and approximately 3.0% by volume of the cementitious composition and polymer fibers in an amount less than approximately 1.0% by volume of the cementitious composition. Chamfers made of the composition are positioned at beam-column joints.

Abstract: A polymer-modified hybrid-fibers cementitious composition has a one-day compressive strength of at least approximately 17 MPa, a 28-day tensile strength of at least approximately 3.8 MPa, an ultimate tensile strain of approximately 3% to approximately 9%, and a 7-day bond strength of at least approximately 2.3 MPa. A binder of ordinary Portland cement, fly ash, and silica fume is provided. Other components include limestone powder, sand, superplasticizer, and water. The composition further includes one or more of styrene butadiene rubber or ethylene-vinyl acetate copolymer in an amount ranging between approximately 2% and approximately 8% by mass of binder. Fiber additives include steel fibers in an amount ranging between approximately 0.3% and approximately 3.0% by volume of the cementitious composition and polymer fibers in an amount less than approximately 1.0% by volume of the cementitious composition. Chamfers made of the composition are positioned at beam-column joints.

Abstract: A high-workability, fire-resistant, anti-spalling concrete composition is provided. The concrete composition has a slump value of at least approximately 150 mm, a fire-resistant period of at least 4 hours, a compressive strength of at least 120 MPa at room temperature, and a compressive strength of at least 20 MPa at 700° C. The composition includes cement, fly ash, silica fume, aggregate particles having a particle size D90 of approximately 20 mm or less and superplasticizer. The composition includes fiber additives including steel fibers in an amount ranging between approximately 0.1% and approximately 0.4% by volume of the concrete composition and polypropylene fibers having a melting point of approximately 200° C. or less in an amount ranging between approximately 0.05% and 0.3% by volume of the concrete composition. Carbon nanotubes are also present in an amount ranging between approximately 0.1% and approximately 0.3% by volume of the concrete composition.

Abstract: A high-workability, fire-resistant, anti-spalling concrete composition is provided. The concrete composition has a slump value of at least approximately 150 mm, a fire-resistant period of at least 4 hours, a compressive strength of at least 120 MPa at room temperature, and a compressive strength of at least 20 MPa at 700° C. The composition includes cement, fly ash, silica fume, aggregate particles having a particle size D90 of approximately 20 mm or less and superplasticizer. The composition includes fiber additives including steel fibers in an amount ranging between approximately 0.1% and approximately 0.4% by volume of the concrete composition and polypropylene fibers having a melting point of approximately 200° C. or less in an amount ranging between approximately 0.05% and 0.3% by volume of the concrete composition. Carbon nanotubes are also present in an amount ranging between approximately 0.1% and approximately 0.3% by volume of the concrete composition.