Engineering Mechanics Institute Conference 2013

Full Program »

EFFECT OF POLYPROPYLENE FIBER ASPECT RATIO ON THE FLEXURAL AND COMPRESSIVE STRENGTH OF COMPRESSED STABILIZED EARTH BLOCKS

PDF Abstract
View File
pdf
149KB

Peter Donkor
University of Florida
United States

Esther Obonyo
University of Florida
United States

Fabio Matta
Univerisity of South Carolina
United States

Abstract:
Soil-cement matrices used for the production of compressed earth blocks (CEB) are typically brittle and this limits their structural application without the use of continuous reinforcing bars. This paper outlines the results of a study carried out to assess the influence of polypropylene fiber aspect ratio on the flexural and compressive strength of compressed stabilized earth blocks (CSEB). An experimental program was set up to produce and test CSEBs. The tests included 4 plain and 16 polypropylene fiber reinforced CSEB matrices. Block matrices were produced with 8% ordinary portland cement and 0.2% fiber content (by weight) for the reinforced matrices. The 0.2% fiber content was made up of fibers of two different aspect ratios; 42 and 21. Center point loading was used in determining the flexural strength of the blocks. Portions of the blocks broken in flexure were tested for their compressive strength. The test results showed an increase in modulus of rupture (MOR) and compressive strength as a result of polypropylene fiber reinforcement. An improvement in post-initial crack behavior was also observed for the fiber-reinforced blocks compared to the unreinforced blocks. The optimum aspect ratio was determined to be 42, which resulted in a 26% increase in flexural strength and an 84% increase in compressive strength compared to the unreinforced blocks.

 

Powered by OpenConf®
Copyright ©2002-2012 Zakon Group LLC