Effect of gradation on pervious concrete properties

Abstract

Effect of aggregate grading on pervious concrete propertiesFresh and hardened pervious concrete properties are experimentally determined in the paper. The correlation between the compressive strength, flexural tensile strength, flow coefficient, and aggregate grading is analysed. As there is no approved method for determining the flow of water through pervious concrete, the testing was conducted in accordance with the already known methods, but using own apparatus. Optimum strength and flow capacity results were obtained on gap graded samples with the 0-2 mm sand content of less than 15 %. Utjecaj granulometrijskog sastava na svojstva procjednog betona U radu su eksperimentalno određena svojstva svježeg i očvrsnulog procjednog betona. Analizirana je zavisnost tlačne čvrstoće, vlačne čvrstoće savijanjem te koeficijenta protočnosti o granulometrijskom sastavu agregata. Budući da ne postoji propisani način određivanja protjecanja vode kroz procjedni beton, ispitivanje je provedeno sukladno poznatim metodama, ali s pomoću samostalno izrađenih pomagala. Na uzorcima s diskontinuiranom granulometrijskom krivuljom, gdje udio frakcije pijeska 0-2 mm u sastavu mješavina nije prelazio 15 %, dobiveni su optimalni rezultati čvrstoće i protočnosti. Einfluss der Kornzusammensetzung auf die Eigenschaften durchlässigen BetonsIn dieser Arbeit sind Eigenschaften frischen und gehärteten durchlässigen Betons durch experimentelle Versuche ermittelt worden. Der Zusammenhang zwischen Druckfestigkeit, Biegezugfestigkeit, Durchflusskoeffizient und Gesteinskörnung ist analysiert worden. Da kein bestimmtes Verfahren zur Ermittlung des Wasserflusses durch durchlässigen Beton vorgeschrieben ist, sind in den Versuchen bekannte Vorgehensweisen mittels der eigenen Ausrüstung angewandt worden. Optimale Resultate in Bezug auf Festigkeit und Durchlässigkeit sind an Proben mit diskontinuierlichen Sieblinen erzielt worden, die einen 0-2 mm Sandkorngehalt unter 15 % nachweisen. Schlüsselwörter:durchlässiger Beton, Festigkeit, Gesteinskörnung, Durchflusskoeffizient

Testing and interpreting permeability of asphalt mixes

“…However, the permeability of asphalt samples is not only affected by the air void content, maximum particle size, sample dimensions, and measurement method, but also by hydraulic characteristics of water [21,22]. These findings are quite similar to the ones presented in the research on permeability of cement concrete [23,24]. There are also research findings suggesting correlation between the normalised air void content and permeability.…”

Analiza svojstava procjednog betona

“…The test setup was designed based on the constant head permeability method [19][20][21] and the permeability testing was conducted as shown in Figure 1. One of the most important features of pervious concrete is its ability to allow percolation of water through the matrix.…”

Geopolymer binder for pervious concrete

“…voids. An increase in the size of aggregate brings about a gradual increase in permeability property due to an increase in void ratio [30,31].…”