Issue 41

S. Zhao et alii, Frattura ed Integrità Strutturale, 41 (2017) 412-423; DOI: 10.3221/IGF-ESIS.41.53 415 see that the content of graphite in this experiment is the biggest factor affecting the strength, followed by scrap copper slag. Numbering Carbon fiber compressive strength test results (MPa) Steel fiber compressive strength test results(MPa) Ordinary Portland Cement Composite Portland Cement Ordinary Portland Cement Composite Portland Cement 1 19.77 22.52 19.77 22.52 2 20.23 21.73 20.23 21.73 3 21.59 21.88 21.59 21.88 4 18.49 22.93 23.31 27.14 5 17.33 20.28 15.31 28.67 6 16.31 19.70 20.85 26.04 7 13.25 16.11 19.91 26.99 8 13.82 20.66 15.97 27.48 9 16.32 16.82 23.08 25.36 Table 3: Test results of the compressive strength. Figure 3: Relationship between the factors, the levels, and the K values (carbon fiber). Figure 4: Relationship between the factors, the levels, and the K values (steel fiber). Fig. 5 and Fig. 6 show the relationship between the factors, the levels, and the K values in the compressive strength test when the composite Portland cement is selected as the cementitious material, and carbon fiber and steel fiber are selected as the fiber materials. It can be intuitively seen from Fig. 5 that when the composite Portland cement is selected as the cementitious material, combined with the carbon fiber in the reinforced experimental group, the strength decreases slightly when the content of the carbon fiber increases., meanwhile, the content of the carbon fiber impacts has a large impact on the concrete's strength largely, followed by the scrap copper slag, and the graphite has the smallest impact. Fig. 6 can be analyzed illustrates that when the content of the steel fiber is increased, the strength of the test block increases significantly. The amount of the steel fiber greatly affects the concrete strength largely, followed by the graphite, and the scrap copper slag has the smallest impact. Tab. 4 shows the measured values of the anti-splitting strength of different material mixing ratios.