Improvement of Permeability Measurement Precision of Pervious Concrete

Abstract

Pervious concrete is used as the material for drainage structure in roads, buildings, and water facilities due to its excellent permeability. Existing devices for testing the permeability of pervious concrete do not consider the fluid leakage through the specimen-container interface induced by the large numbers of open pores on the surface of molded specimen. This may significantly affect the precision of the results. In this study, a new permeability test device for pervious concrete was developed and a modified permeability testing method is described. The modified method and currently used test methods were employed to measure the permeability of molded specimens with different porosities, graded aggregates, and admixtures. In order to calibrate the modified method, the permeabilites of the cored specimens were measured using the method and currently used test methods. The comparisons show that the permeabilities of the molded specimens measured using the modified method are lower than the two existing methods, and are approximate to the results of cored specimens. This indicates that for the molded specimens, the modified method can give better precision and more accuracy than the two existing methods.

Clogging of pervious concrete pile caused by soil piping: an approximate experimental study

“…Second, migrations of gravity-driven particles are rather weak compared with migrations of particles induced by seepage forces (Tomlinson and Vaid 2000). The functions of the developed simulation system mainly include the following: (1) avoiding leakage on the pervious concrete specimen sidewalls during the hydraulic conductivity tests by using a waterproof daub and flexible rubber cushion (Cui et al 2015); 2simulating the PCP clogging caused by soil piping; (3) recording the continuous variation in hydraulic conductivities for both the pervious concrete and soil column; and (4) simultaneously monitoring the change in pervious concrete electrical conductivity during the clogging process. All the measurement modules employed have been calibrated.…”

Measurement of Permeability and the Correlation between Permeability and Strength of Pervious Concrete

“…This is because there exits large numbers of open pores on the surface of pervious concrete specimens; these open pores are directly connected to the container sidewall. A new permeability test device for pervious concrete is developed (Cui et al 2015). This device (as shown in Fig.…”

“…The method described in the authors' previous study (Cui et al 2015) is used in the mix design of pervious concrete. Cement paste encapsulating aggregate method was used to mix the pervious concrete.…”

Experimental Study on the Effects of Admixtures on Freezing-Thawing Resistance of Pervious Concrete

“…15%, 20% and 25%. The mix design method used in this study is presented in authors' previous study (Cui et al, 2015). The mixtures were prepared using a laboratory mixer, and specimens were cast in the 400 mm × 100 mm × 100 mm molds and demolded after 24 hours.…”

“…As permeability coefficient is an important characteristic of pervious concrete, it was measured using the improved method introduced by Cui et al 2015.…”