Effects of Incorporating Dune Sand as Fine Aggregate Replacement in Self-Compacting Concrete

Abstract:

The aim of this study is to investigate the effects of incorporating dune sand as fine aggregates replacement in self-compacting concrete. Twelve mixes were cast and tested for both fresh and hardened properties. The mixes were divided into 2 groups: Each group comprised six mixes. The constituent materials were as follows: Normal Portland cement CEM Ι 42,5N, dolomite as coarse aggregates of maximum size 10 mm, medium-sized sand, silica fume was 10% by weight of cement. Coarse: fine aggregates ratio was 1:1. Admixture which complies with ASTM C494 Types G and F was used in the 12 mixes (3.5% by weight of cement ).Dune sand replaced natural sand by zero %,10%,25%,50%, 75%,and 100% respectively .For , the first group (Group A), the cement content was 350 Kg/m³, while for the second group (Group B), the cement content was 400 Kg/m³.Tests carried out on fresh self-compacting concrete were slump flow,T_50cm ,V-funnel, V-funnel _t5min ,and GTM screen stability test . Tests conducted on hardened concrete were compressive strength at ages 7 and 28 days, flexural, and splitting tensile strengths were also conducted at age 28 days. The obtained results showed that the fresh properties satisfied the Egyptian Technical Specification limits. Regarding the hardened properties, both 28 days compressive and flexural strengths exhibited improvement till 50% replacement when compared to their respective control mixes.

• Periodical: Key Engineering Materials (Volume 668)
• Pages: 189-196
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.668.189
• Online since: October 2015
• Authors: Enas Khattab*
• Keywords: Dune Sand, Properties, Self-Compacting Concrete

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