Degree Type
Thesis
Date of Award
2011
Degree Name
Master of Science
Department
Civil, Construction, and Environmental Engineering
First Advisor
Vern R. Schaefer
Second Advisor
Kejin Wang
Abstract
Portland Cement Pervious Concrete (PCPC) is a unique and effective mean to solve the important environmental issues and to support green, sustainable growth, by reducing stormwater and providing treatment of pollutants contained within. As a replacement for conventional impermeable pavement, PCPC has seen increasing used in recent year.
Clogging of PCPC leading to potential problems in serviceability has been regarded as one of the primary drawbacks of PCPC systems. The clogging potential of three void ratios of pervious concrete were examined using three different soil types: sand, clayey silt and clayey silty sand. Pervious concrete cylindrical specimens were exposed to sediments mixed in water to simulate runoff with small and large load of soil sediments. Pressure washing, vacuuming and a combination of these were used as rehabilitation methods to clean the clogged specimens. The clogging tests were conducted using falling head permeability apparatus by allowing the "dirty water" to flow through the specimen. A clogging cycle included both clogging and cleaning procedure. The permeability was determined during the clogging procedure and after the cleaning procedure in each clogging cycle. 20 clogging cycles were repeated on each sample to simulate the 20 years of pavement service life.
The results show that permeability reduction magnitude as well as rate and permeability recovery by rehabilitation are significantly affected by sediment types, void ratios of specimens, and selection of rehabilitation methods. The results provide a quantitative evaluation of the clogging effect of pervious concrete, and the comparison of tested rehabilitation methods in terms of permeability recovery.
Copyright Owner
Bin Tong
Copyright Date
2011
Language
en
Date Available
2012-04-30
File Format
application/pdf
File Size
201 pages
Recommended Citation
Tong, Bin, "Clogging effects of portland cement pervious concrete" (2011). Graduate Theses and Dissertations. 12048.
https://lib.dr.iastate.edu/etd/12048
