• Ouf, Mohamed Elsadek

Abstract

igid pavement rested on clayey soil may be adversely affected by the behaviour of sub-gradesoil. The clayey soil may swell or shrink which causes unexpected cracks in pavement and thereforeneeds greater thickness to sustain the expected loads. The objective of this study is to achieve aneconomic design of rigid pavement on expansive clay. Specimens of reinforced concrete slabs weretested on a bed of Egyptian soil and were loaded untill failure. A reinforced concrete slab especiallydesigned to sustain the expected airport loads, supported on the natural clayey soil was tested as acontrol specimen in the first phase. In the second phase, the natural soil was stabilized using two mixes,cement dust and lime by ratio (3:1), while the second mix was ground granulated blast furnace slag (GGBS) and lime by ratio (3:1). In the third phase, a control specimen was tested on soil replacement bysand layer. The results of this study proved that the best alternative to obtain the best stress / strain ratiowas using GGBS and lime (3:1 ratio) to stabilize the natural soil and the percentage of total binder was6% by dry weight of soil. 1. Introduction and Background Economic development of any country is controlled to a great extent by the highway and airport networks.This is becoming particularly apparent in the developing countries, where tremendous lengths of roadsand airports need to be constructed in order to facilitate the development of import, export, commerceand industry. The cost of any project includes initial costs and subsequent maintenance costs. The initialcosts include many items such as land, bridges and subways, drainage, pavement construction etc.Therefore, the deve

Topics

• impedance spectroscopy
• phase
• crack
• cement
• lime