科研之友
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摘要
This study is to evaluate the potential application of porous concrete with recycled coarse aggregate (RA) in riparian buffer area from two aspects: mechanical behaviour and vegetation performance. The effect of curing duration, RA grading, water/cement ratio (W/C) and cement paste/RA ratio (CP/RA) on the porosity and strength of RA porous concrete were determined by effective porosity and compressive strength tests, followed with evaluating the durability by wetting-drying (W-D) cycle tests. The vegetation performance of the porous concrete was evaluated, and then a tank leaching test was carried out to investigate the absorption capacity for total nitrogen (T-N) and total phosphorus (T-P). The results show that the compressive strength strongly depends on the bonding capacity among RA grains and slightly depends on RA grading; CP/RA ratio has a greater effect on effective porosity than other variables since diluted cement paste is more liable to fill the pores in the concrete; the mass transport (MT) values when suffering different W-D regimes ranges from 0.98 to 2.36%, indicating that porous concrete can maintain the structural integrity. Porous concrete with the RA grading (20-25 mm) is more suitable for vegetation growth than other grading, and incorporating with plants exhibits a considerable removal efficiency for T-N and T-P in wastewater, with maximum values of 59.82% and 61.99%, respectively. In general, the porous concrete with RA investigated in this research can offer a prominent technical advantage when applied in riparian buffer zones considering its structural improvement and reducing environmental load.
