FraMCoS 7 2010 Jeju, South Korea

Verification of wet and dry packing methods with experimental data

It is well known that packing density of aggregate, which is related to distribution of aggregate, aggregate size, shape, and surface texture, plays an important role in performance of concrete. All existing methods of measuring the packing density of aggregate…

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Year 2010
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Abstract

It is well known that packing density of aggregate, which is related to distribution of aggregate, aggregate size, shape, and surface texture, plays an important role in performance of concrete. All existing methods of measuring the packing density of aggregate are carried out under dry condition. A new method, which measures the packing density of aggregate under wet condition, has been developed. It is called the wet packing method. Particle packing models, which are used to estimate the packing density/voids ratio of the solid combinations, can provide tools to improve the performance of concrete. In this paper, packing density of aggregate in various conditions including dry and wet packing methods were experimentally calculated. Finally, calculated results under wet conditions have been compared to those under dry ones and have been verified by theoretical models. 1 INSTRUCTION mathematical models to predict packing density of powder particles (Stovall et al. 1988, Yu & Standish Packing density, defined as the volume of solids per 1988, Yu et al. 1997, Suzuki et al. 2001, Rassouly total bulk volume, which is widely used to evaluate 1999). Studies on packing and rheological behavior and combine aggregates. The geometrical have been performed for no-slump concrete/ Roller characteristics of shape, angularity, texture, and Compacting Concrete (Ouellet 1997, Lahus 2001), particle size distribution affect packing density; for SCC (Noguchi et al. 1999) and for Ultra High therefore, packing density can be used as an indirect Performance Concrete (Nehdi & Mindess 1998, indicator of aggregate geometrical characteristics. In Geisenhanslu & Schmidt 2004, Jacobsen et al. 2005) general, higher packing density is preferred, indicating varying empirical relations.