Experimental Study on Permeability and Runoff Purification Performance of Microbial Enhanced Recycled Pervious Concrete

doi:10.16552/j.cnki.issn1001-1625.2026.0165

Abstract

Abstract:

Using microbial-induced carbonate precipitation （MICP） technology to repair recycled aggregate for pervious concrete pavement can effectively avoid aggregate damage and environmental pollution caused by physical or chemical repair. In this paper， the influences of recycled aggregate content and design porosity on the permeability and pore characteristics of recycled pervious concrete were studied. Through the dynamic adsorption test of runoff pollutants， the periodic evolution characteristics of the purification efficiency of pervious concrete on heavy metal pollutants in runoff before and after aggregate repair were deeply explored. With the help of scanning electron microscopy combined with energy dispersive spectroscopy （SEM-EDS）， the distribution characteristics and relative content of residual elements on the surface of concrete pore wall were further analyzed， and the purification mechanism was revealed from the micro level， so as to realize effective engineering application. The results show that with the increase of recycled aggregate content， the permeability coefficient and connected porosity difference between concrete after strengthening and before strengthening increases. When the content is 50% （volume fraction）， the permeability coefficient and the connected porosity are reduced by 31.51% and 15.15% respectively compared with those before strengthening， which is attributed to the filling effect of biological CaCO₃ on aggregate defects. The initial purification rate of Zn²⁺， Cr³⁺ and Pb²⁺ by pervious concrete is increased to 35% to 80% by biological CaCO₃， and the adsorption effect of Zn²⁺ is the best， followed by Cr³⁺ and Pb²⁺. The biological CaCO₃ on the aggregate surface can undergo ion exchange and surface chemical complexation with heavy metal ions in the runoff， significantly increasing the residual amount of heavy metal elements on the surface of the concrete pore wall， and showing local enrichment characteristics， with excellent purification efficiency.

Key words: microbial mineralization, recycled pervious concrete, water permeability, runoff pollution, heavy metal ion, purification mechanism

CLC Number:

U414

CHEN Minli, QIN Xiao, XIN Xiangyu, ZHANG Haolin, LIN Yongkang. Experimental Study on Permeability and Runoff Purification Performance of Microbial Enhanced Recycled Pervious Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(8): 2944-2955.

Figures/Tables 15

References 15

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Type	Water absorption/%	Apparent density/（kg·m^-3）	Crush value/%	Needle flake aggregate content/%	Soil content/%
Recycled aggregate	12.81	2 335	28.23	9.8	1.8
Natural aggregate	1.08	2 749	19.75	9.5	0.8

Type	Water absorption/%	Apparent density/（kg·m^-3）	Crush value/%	Needle flake aggregate content/%	Soil content/%
Recycled aggregate	12.81	2 335	28.23	9.8	1.8
Natural aggregate	1.08	2 749	19.75	9.5	0.8

Sample No.	Aggregate		Cement	Silica fume	Water	Water reducing agent	Thickening agent
Sample No.	Recycled aggregate	Natural aggregate	Cement	Silica fume	Water	Water reducing agent	Thickening agent
（M）RA-D20%	1 261.46	255.98	414.58	26.46	110.26	4.41	4.41
（M）RA-D30%	1 103.77	383.96	419.61	26.78	111.60	4.46	4.46
（M）RA-D40%	946.09	511.95	424.63	27.10	112.93	4.52	4.52
（M）RA-D50%	788.41	639.94	429.66	27.43	114.27	4.57	4.57
（M）RA-V15%	1 103.77	383.96	468.86	29.93	124.70	4.99	4.99
（M）RA-V18%	1 103.77	383.96	419.61	26.78	111.60	4.46	4.46
（M）RA-V21%	1 103.77	383.96	370.36	23.64	98.50	3.94	3.94
（M）RA-V24%	1 103.77	383.96	321.11	20.50	85.40	3.42	3.42

Sample No.	Aggregate		Cement	Silica fume	Water	Water reducing agent	Thickening agent
Sample No.	Recycled aggregate	Natural aggregate	Cement	Silica fume	Water	Water reducing agent	Thickening agent
（M）RA-D20%	1 261.46	255.98	414.58	26.46	110.26	4.41	4.41
（M）RA-D30%	1 103.77	383.96	419.61	26.78	111.60	4.46	4.46
（M）RA-D40%	946.09	511.95	424.63	27.10	112.93	4.52	4.52
（M）RA-D50%	788.41	639.94	429.66	27.43	114.27	4.57	4.57
（M）RA-V15%	1 103.77	383.96	468.86	29.93	124.70	4.99	4.99
（M）RA-V18%	1 103.77	383.96	419.61	26.78	111.60	4.46	4.46
（M）RA-V21%	1 103.77	383.96	370.36	23.64	98.50	3.94	3.94
（M）RA-V24%	1 103.77	383.96	321.11	20.50	85.40	3.42	3.42

Sample No.	Flexural tensile strength/MPa	Split tensile strength/MPa	Compressive strength/MPa
（M）RA-D20%	（1.71）1.68	（1.96）1.81	（16.84）15.75
（M）RA-D30%	（1.74）1.57	（1.93）1.72	（16.61）14.25
（M）RA-D40%	（1.65）1.30	（1.66）1.27	（15.11）12.33
（M）RA-D50%	（1.34）1.06	（1.24）0.87	（11.37）8.65
（M）RA-V15%	（1.91）1.70	（2.14）1.88	（18.56）16.05
（M）RA-V18%	（1.74）1.57	（1.93）1.72	（16.61）14.25
（M）RA-V21%	（1.32）1.13	（1.63）1.36	（13.73）11.24
（M）RA-V24%	（0.88）0.74	（1.15）0.93	（8.23）6.58