Water purification performance of novel pervious concrete under rainstorm
Permeable concrete has been limited to light traffic grade pavement because of insufficient strength and durability.An innovative high strength pervious concrete with straight holes is prepared based on C80 self-compacting concrete.The rainstorm intensity level is taken as the environmental factor variable to discuss the ad-sorption capacity of such pervious concrete on heavy metal ions(copper,zinc).The purification effect of each component of concrete to copper and zinc ions is studied and the adsorption mechanism is analyzed.The results show that the innovative pervious concrete has excellent mechanical properties(The compressive strength is 94.8 MPa and the flexural strength is 8.4 MPa)and water permeability(permeability coefficient is 0.81 mm/s),the removal rate of copper and zinc ions decreases with the increase of rainstorm levels.The removal rate of copper and zinc ions can still reach 22.5％and 17.5％under the extremely heavy rainstorm,indicating that in-novative pervious concrete possesses good water purification capacity.The results show that the hydration prod-ucts of cementitious materials are the main adsorbents of heavy metal ions.The removal effect of powder hydrated cementitious materials on Zn2+is better than that of Cu2+,while the removal effect of block hydrated cementi-tious materials and steel fibers is more obvious.
innovative pervious concreterainstorm levelheavy metal ionswater purification performance
万方数据
维普
