THE INFLUENCE OF SUPPLEMENTARY CEMENTITIOUS MATERIALS ON THE PROPERTIES OF HIGH-STRENGTH FIBER-REINFORCED CONCRETE AND THEIR SIZE EFFECT
The study investigates the impact of varying dosages and addition methods of silica fume,Class I fly ash,and S95 slag powder on the mechanical properties and size effect of Fiber High Performance Concrete(FHPC).The results indicate that S95 slag powder is most effective for promoting compressive and flexural strength,followed by silica fume,with Class I fly ash having the least impact.The compressive strength is significantly boosted with com-bining Class I fly ash and S95 slag powder in a 1:2 mass ratio,whereas a 1:1 mass ratio of silica fume and S95 slag powder greatly improved flexural strength.When all three mineral admixtures are used,maintaining a constant silica fume dosage,a 1:1 mass ratio of Class I fly ash and S95 slag powder notably improves FHPC mechanical properties.As the water-cement ratio increases,the size effectiveness on compressive and flexural strength of FHPC diminishes.
active mineral admixturefiber-reinforced high-strength concretesize effectlow water-cement ratio
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