Related Experiment Video
Updated: Jan 1, 2026

Author Spotlight: Unraveling the Role of Earthworms in Enhancing Mineral Weathering for CO2 Removal
Published on: November 10, 2023
Environmental behavior of construction and demolition waste as recycled aggregates for backfilling in mines: Leaching
Hengfeng Liu1, Jixiong Zhang1, Baiyi Li1
1State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China.
Abstract:
Environmental behavior of construction and demolition waste in cemented backfilling mining technology (CW-CBMT) is studied, with the aim of expanding the scope of construction and demolition waste (CDW) utilization, as well as developing strategies to release coal resources. Toxicity leaching, scanning electron microscopy (SEM), and mechanical properties testing about on-site sampling are carried out, and surface subsidence is surveyed. The results reveal that the maximum leaching concentration (0.00113 mg/L) of arsenic from cemented backfilling body with construction and demolition waste (CBCW) is small, the leaching solution is alkaline, and the leaching of heavy metals is influenced by aggregate particle size and by acidity and alkalinity. The results also show that the average compressive strength of CBCW is 2.4 MPa. The distribution of aggregates and elemental content influence the spatial distribution of compressive strength. The variation of internal distribution of elemental content of the CBCW can be interpreted by multifractal parameters. The maximum surface subsidence value is 245 mm, with the fastest sinking speed occurring in the mining stage and a return of surface subsidence stability after halting of mining. A comprehensive analysis of the test results shows that, from an environmental viewpoint, the application of CW-CBMT is successful.
More Related Videos
11:14Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
11:19Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
Related Concept Videos
Deleterious Substances in Aggregate
Another type of impurity is clay and fine material that...
Aggregates Classification
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...
Preplaced Aggregate Concrete
Design Example: Managing Concrete Workability
Quarrying of Stone
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the...
Unsoundness of Aggregate due to Volume Change