| Specimen production | 2017-06-05 |
| Mixing of recycled aggregate | 2017-06-05 |
| Experiment and storage of concrete specimen | 2017-06-05 |
| Equipment of laboratory | 2017-06-05 |
| Doctor degree defense of Li long | 2017-06-05 |
| Collection of building construction waste | 2017-06-05 |
