Impact of Silica fume on the properties of Asphalt pavement base course

Impact of Silica fume on the properties of Asphalt pavement base course

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2016 by IJETT Journal
Volume-35 Number-10
Year of Publication : 2016
Authors : Farag Khodary
DOI :  10.14445/22315381/IJETT-V35P297

Citation 

Farag Khodary"Impact of Silica fume on the properties of Asphalt pavement base course", International Journal of Engineering Trends and Technology (IJETT), V35(10),487-491 May 2016. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
Major road projects needs special limits of specification for the base course material. These limits of specifications may not be available in the local materials used in the project area. So researcher starts to look for additives that can be used to improve the properties of the used materials to reach the required limit of specifications for base course in highway construction. The aim of this work is to study the effect of silica fumes on the soil properties that used for base course in terms of maximum dry density and California Bearing Ratio (CBR). Silica fumes resulting from the reduction of high-purity quartz with coal in electric arc furnaces in the manufacture of ferro-silicon. Morphology and structural of the Silica fume were investigated by transmission electron microscopy (TEM) and scan electron microscope (SEM). A series of laboratory experiments have been implemented for varieties of samples with different modification levels of silica fume namely 2%, 4%, 6%, 8% and 10 % by weight added to the base course soil. The result shows that adding silica fumes improve both strength and stability of the modified soil. The optimum water content increase from 6.2% for unmodified soil to 7.4% for soil modified with 10% silica fume. The maximum dry density for modified soil with 2%,4%,6%,8% and 10% silica fume increased by 2.2%, 3.8%, 5.7%, 9.5% and 11.0% respectively. The California Bearing Ratio (CBR) for modified soil with 2%,4%,6%,8% and 10% silica fume increased by 13.9%, 25.7%, 48.9%, 61.9% and 75.0% . From the hole test result and evaluation of the modified soil in the lab silica fume can improve both strength and stability for the tested soil to be used as base course layer in highway projects.

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Keywords
Silica fume, highway construction, transmission electron microscopy (TEM), scan electron microscope (SEM), California Bearing Ratio (CBR).