3 Results and analysis
The measured load-displacement curves of all test specimens are plotted in Fig. 3. The experimental results of Fhtnax-values and fracture toughness ratio (W /WBA) are summarized in Table 3. In this ratio, W is the fracture toughness of fiber reinforced concrete and is defined as the area below the load-displacement curve up to a CMOD of 1.5 mm. WBA is the area below the load-displacement curve for the unreinforced concrete (BA) up to a zero load. The specific fracture energy Gf of BA is 100 N/m. Comparing the maximum load (Flunax) of the control (BA) to those of the fiber reinforced
concretes yields the following values:
Fhmax (Sll %) / Fhmax (BA) = 1.00
Fhmax (SI2%) I Fhmax (BA) = 1.01
Fhmax (SI3%) / Fhmax (BA) = 1.02
Fhmax (ST0.5%) I Fhmax (BA) = 1.32
Fhmax (STl % ) I Fmnax (BA) = 1. 73
Table 3. Experimental results of maximum load and fracture toughness