**4.3 Compressive strength**

The compression tests were carried out for the SCFRC cylinders to obtain the three-day and seven-day compressive strengths. **Figure 3** shows the compressive

**Figure 2.** *Air contents of SCFRC batches.*

**95**

**Figure 4.**

observed.

*Towards Innovative and Sustainable Construction of Architectural Structures by Employing…*

test results of the SCFRC specimens from selected batches at three and seven days. In some batches, due to the premature failure of some cylinders, the results at the three- and seven-day compressive testing were not reported in the figure. The compressive strengths ranged from 27.64 and 43.17 MPa for three-day testing specimens while the seven-day testing results showed compressive strengths ranging from

The average three-day compressive strength of batch 3 (35.85 MPa) was lower than that of batch 2 (39.01 MPa). The reduction in the three-day compressive

strength of cylinders in batch 3 was due to the increase of water and the coarse aggregate adjustments. The SCFRC strength of the three-day compressive test results of batch 5 (43.17 MPa) exhibited the highest compressive strength among all the tested batches. Several trials were conducted after this batch, and the desired mixture was attained in batch 14 with the seven-day SCFRC compressive strength of 39.26 MPa. **Figure 4** shows the compression failure of selected cylinders from four batches. As can be seen in **Figure 4a**, the cylinder broke along the edge, not through the center. The failure is attributed to a minor defect in the bottom surface of the cylinder molds. The mold irregularity effect on the compressive strength were taken care of while producing subsequent batches, as seen in **Figure 4b**. The cylinders in batch 3 failed at the middle section and concrete splitting at the bottom of the cylinder was

*Compression failure of SCFRC specimens from four batches (a) batch 2, (b) batch 3, (c) batch 6, (d) batch 13.*

36.31 to 51.48 MPa, which well fulfilled the application needs.

*DOI: http://dx.doi.org/10.5772/intechopen.95091*

**Figure 3.** *Average compressive strengths of SCFRC batches.*

### *Towards Innovative and Sustainable Construction of Architectural Structures by Employing… DOI: http://dx.doi.org/10.5772/intechopen.95091*

test results of the SCFRC specimens from selected batches at three and seven days. In some batches, due to the premature failure of some cylinders, the results at the three- and seven-day compressive testing were not reported in the figure. The compressive strengths ranged from 27.64 and 43.17 MPa for three-day testing specimens while the seven-day testing results showed compressive strengths ranging from 36.31 to 51.48 MPa, which well fulfilled the application needs.

The average three-day compressive strength of batch 3 (35.85 MPa) was lower than that of batch 2 (39.01 MPa). The reduction in the three-day compressive strength of cylinders in batch 3 was due to the increase of water and the coarse aggregate adjustments. The SCFRC strength of the three-day compressive test results of batch 5 (43.17 MPa) exhibited the highest compressive strength among all the tested batches. Several trials were conducted after this batch, and the desired mixture was attained in batch 14 with the seven-day SCFRC compressive strength of 39.26 MPa.

**Figure 4** shows the compression failure of selected cylinders from four batches. As can be seen in **Figure 4a**, the cylinder broke along the edge, not through the center. The failure is attributed to a minor defect in the bottom surface of the cylinder molds. The mold irregularity effect on the compressive strength were taken care of while producing subsequent batches, as seen in **Figure 4b**. The cylinders in batch 3 failed at the middle section and concrete splitting at the bottom of the cylinder was observed.

**Figure 4.** *Compression failure of SCFRC specimens from four batches (a) batch 2, (b) batch 3, (c) batch 6, (d) batch 13.*

*Design of Cities and Buildings - Sustainability and Resilience in the Built Environment*

excellent slump flow of 660.4 mm with an air content of 4.8 percent.

**4.3 Compressive strength**

was recorded for batch 3. This air-content values were favorable, as compared to the results reported elsewhere [30]. The experimental results from batch 14 showed an

The compression tests were carried out for the SCFRC cylinders to obtain the three-day and seven-day compressive strengths. **Figure 3** shows the compressive

**94**

**Figure 3.**

*Average compressive strengths of SCFRC batches.*

**Figure 2.**

*Air contents of SCFRC batches.*
