• Ouf, Mohamed Elsadek

Abstract

he possibility to use a large amount of waste materials as a replacement for the imported virgin materialin road construction has been recognized. RoadCem is a soil stabiliser provides cheap and more environmentallyfriendly source of materials for road construction to use with in-situ material. This results in reduction in therequired thickness of the pavement consequently reducing costs and contributes to the solution of declining resourceof imported materials. An extensive study was carried out on a sample of Egyptian soil. RoadCem as a primarystabiliser with ground granulated blast furnace slag (GGBS), lime and ordinary Portland cement (OPC) wereemployed. The results revealed that the unconfined compressive strength (UCS) and the modulus of elasticity (E40)of the test soil increased while the free swelling percent (FSP) decreased with an increase in the total stabiliser andthe curing period.[M. S. Ouf. EFFECT OF USING POZZOLANIC MATERIALS ON THE PROPERTIES OF EGYPTIANSOILS. Life Science Journal 2012; 9(1):554-560]. (ISSN: 1097-8135). http://www.lifesciencesite.com. 83 Keywords: Clay, RoadCem, slag, lime and swelling soil. 1. Introduction and Problem DefinitionThe traditional section for road typically consistsof different layers such as the surface coarse, baseand sub-base courses. These layers are typically madeof imported materials that require transport,environmental and other costs increase with thedistance to the source of the materials. The relianceon imported material is the main problem, from asustainability and efficiency point of view, of thetraditional road and pavement design andconstruction. Due to the gradual depletion in theconventional resources, searching for a more rationalroad construction approach aimed at reducing thedependence on imported materials while improvingthe quality and durability of the roads is necessary[5].Many chemical substances have been used tostabilise soils, e. g. lime, OPC, and GGBS. Lime andOPC are the two common additives which have beenemployed in stabilisation of Egyptian subgrade toproduce a base or sub base layer instead of importinggranular base course materials [7]. Modern societiesproduce large quantities of waste materials oftendisposed off in landfill and considered not to haveany value. As the society develops, larger quantitiesof waste materials continue to be generated by peopleand these mountains of waste are also becoming aproblem. The possibility to use a large amount ofthese waste materials as a replacement for theimported virgin material in road construction hasbeen recognized as an option. Up to now only alimited portion of the waste stream could be broughtto use in road construction due to pollution problemsassociated with reuse of waste materials in roadconstruction [5].RoadCem is a blend of special selectedsubstances in various percentages with eachindividual, chemical specific characteristics. It is anadditive and OPC improver, used in soil stabilisationtypically for road construction [5]. The use ofRoadCem can control of waste streams and pollution,on the other hand it can provide cheaper and moreenvironmentally friendly source of materials for roadconstruction. This results in the reduction of therequired thickness of the pavement structuresconsequently reducing road costs and11. van der Sloot, H.A. (2002) C

Topics

• impedance spectroscopy
• surface
• strength
• cement
• elasticity
• durability
• curing
• lime