الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Literature review has revealed that there have been manychemical
stabilizers which are used in soil stabilization, such as cement, lime, cement kiln dust and others. New materials are always produced and are tested for their suitability for the use of soil stabilization. Therefore, the main objectives of this study are: (1) Investigating the effect of the new Liquid Chemical Soil Stabilizer (L.C.S.S.) as a soil stabilizer when used alongside some other traditional stabilizers; (2) Examining the impact of using the L.C.S.S. beside some other traditional stabilizers on the structural design of
pavement sections (flexible and rigid) of many classes of highways in Egypt
according to the Egyptian code for urban and rural highways; (3) Hence,
investigating the economic feasibility of using the L.C.S.S. and the
traditional stabilizers in highways’ pavement construction.
Soil samples were brought to the highway and geotechnical engineering
laboratories at Shoubra Faculty of Engineering. The used soil types were
classified as silty sand (A-2-4), as a representative of coarse soil, and high
plastic clay (A-7-6), as a representative of fine soil. Cement and cement kiln dust were the selected traditional stabilizers for coarse soil, whereas hydrated lime was the selected one for fine soil stabilization. Sufficient quantities of stabilizers have been brought and stored in waterproof containers. Experimental work was done on the untreated and treated soil to study the stabilizing effect of the stabilizers. Cement kiln dust contents were 2%, 4%,8%, and 12% by dry weight of the soil (with or without adding L.C.S.S.).Whereas cement contents were 2%, 4%, 6%, 8%, and 10% (with or without adding L.C.S.S.). Hydrated lime contents were 3%, 6%, 9%, and 12% by dry
weight of the soil (with or without adding L.C.S.S.). The concentration of
the L.C.S.S. was constant in this research. It is the concentration
recommended by the manufacturer of the L.C.S.S. (1:1000 by volume of
water).By using the experimental work results, structural design of the required flexible and rigid pavements of arterial, collector, and local highways was implemented. The construction costs of one square meter of the required
flexible and rigid pavements were calculated, in case of traditional
pavements (without soil stabilization), and in case of using the chemical
stabilization process in pavement construction, to evaluate its economic
feasibility in highways construction.
Finally, by using the results of the cost estimations, the following
conclusions were derived:
1) The chemical soil stabilization is an effective method to improve the soil
characteristics and to reduce the cost of pavement construction,
especially the greater the transportation distance of the materials which are used in the granular base and subbase layers.2) For fine soil, using the L.C.S.S. is not economically feasible in soil stabilization; and the optimum lime content is 3%.
3) For Coarse soil: For flexible pavement, for arterial and collector highways, using the
stabilized soil with 6% cement (with adding the L.C.S.S.) as a base
layer is the more economical solution. Whereas for local highways, he more economical solution is using the stabilized soil with 8%
cement kiln dust as a base layer.
For rigid Pavement, for all highway classes, using the stabilized soil
layer with 8% cement kiln dust as a subbase layer is the most
economical solution.