Research Article
Effect of Desert Sand on the Mechanical Properties of Desert Sand Concrete (DSC) after Elevated Temperature
Table 6
Experimental results of DSC after elevated temperature.
| Index | T (°C) | DSRR-0% | DSRR-20% | DSRR-40% | DSRR-60% | DSRR-80% | DSRR-100% |
| Mass loss rate (%) | RT | 0 | 0 | 0 | 0 | 0 | 0 | 100 | 0.64 | 0.73 | 0.68 | 0.65 | 0.63 | 0.62 | 300 | 3.10 | 3.50 | 3.35 | 3.16 | 3.08 | 3.03 | 500 | 4.31 | 4.80 | 4.77 | 4.30 | 3.96 | 3.88 | 700 | 6.48 | 6.86 | 6.63 | 6.30 | 5.96 | 5.72 |
| Compressive strength (MPa) | RT | 47.67 | 48.79 | 51.09 | 48.29 | 46.85 | 43.67 | 100 | 50.82 | 51.62 | 56.24 | 53.54 | 48.57 | 47.07 | 300 | 48.50 | 50.77 | 56.31 | 54.94 | 51.02 | 47.37 | 500 | 42.26 | 47.58 | 49.65 | 44.38 | 42.05 | 40.79 | 700 | 34.06 | 34.55 | 35.20 | 31.50 | 30.84 | 30.00 |
| Splitting tensile strength (MPa) | RT | 1.88 | 1.94 | 2.40 | 1.99 | 1.76 | 1.75 | 100 | 1.99 | 2.04 | 2.45 | 2.12 | 1.77 | 1.80 | 300 | 1.14 | 1.20 | 1.59 | 1.35 | 1.23 | 1.36 | 500 | 0.81 | 0.84 | 0.91 | 0.89 | 0.78 | 0.75 | 700 | 0.66 | 0.68 | 0.74 | 0.61 | 0.65 | 0.54 |
| Flexural strength (MPa) | RT | 3.45 | 3.53 | 3.89 | 3.63 | 3.45 | 3.43 | 100 | 3.07 | 3.36 | 3.59 | 3.45 | 3.27 | 3.25 | 300 | 2.26 | 2.45 | 2.64 | 2.31 | 2.33 | 2.30 | 500 | 1.04 | 1.34 | 1.36 | 1.31 | 1.20 | 1.16 | 700 | 0.73 | 0.95 | 0.99 | 0.98 | 0.97 | 0.94 |
| Ultrasonic wave velocity (km·s−1) | RT | 4.28 | 4.37 | 4.41 | 4.32 | 4.25 | 4.16 | 100 | 4.22 | 4.33 | 4.37 | 4.28 | 4.23 | 4.18 | 300 | 3.55 | 3.77 | 3.74 | 3.71 | 3.68 | 3.66 | 500 | 1.51 | 1.79 | 1.81 | 1.83 | 1.81 | 1.91 | 700 | 1.21 | 1.37 | 1.46 | 1.66 | 1.60 | 1.74 |
| Neutralization depth (mm) | RT | 1.88 | 1.84 | 1.62 | 1.50 | 1.50 | 1.51 | 100 | 1.87 | 1.79 | 1.58 | 1.55 | 1.21 | 1.14 | 300 | 1.93 | 1.98 | 1.73 | 1.63 | 1.40 | 1.38 | 500 | 5.81 | 5.15 | 5.55 | 4.81 | 4.56 | 3.81 |
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RT, room temperature.
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