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PACKING OF CRUSHED SAND – INFLUNECE OF TEST METHOD, GRAIN SHAPE AND SIZE DISTRIBUTION

Abstract

The aim was to produce data to find a suited test method and sand parameters for determination of the void ratio parameter for crushed sand to be used in the "particle-matrix-model – PMM. PMM considers workability from the volumetric ratio between the viscous matrix phase (expressed by a flow resistance parameter) and the solid particle phase (expressed by the void ratio parameter). Four test methods were included, all based on filling of a container with known volume, also representing different degrees of additional compaction energy. The results confirm that the voids ratio varies between different filling procedures and compaction levels. Four different commonly used sands in Norway were tested, representing various grain shape. All sands were sieved to achieve a clean fraction 0.125 – 4 mm representing the "natural" grain size distributions (GSD). In addition, all sands were split in five fractions, and then combined to achieve similar "dense" and "open" GSDs. This made it possible to separate the influence of shape and GSD. The results show that the traditional concept of “open and “dense” GSD corresponds to high and low voids ratio, respectively and that increasing angularity of the grains contributes to increased voids ratio.

Category

Conference lecture

Language

English

Author(s)

Affiliation

  • SINTEF Community / Architecture, Materials and Structures
  • Norwegian University of Science and Technology

Presented at

CONCRETE STRUCTURES FOR RESILIENT SOCIETY, Proceedings of the fib Symposium 2020, Edited by: Bin Zhao & Xilin Lu

Place

22-24 November 2020, Online, Shanghai, China, pp 126-134.

Date

22.11.2020 - 24.11.2020

Organizer

fib - Fédération Internationale du Béton

Year

2020

View this publication at Norwegian Research Information Repository