By C. R. Scott B.A., M.I.C.E., M.I.Struct.E. (auth.)
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Civil Eng. 25. British Standards Institution. Methods of test for soils for civil engineering purposes. BS 1377:1975. CASAGRANDE, A. 1947. Classification and identification of soils. Proc. A mer. Soc. Civil Eng. 73. US Corps of Engineers. 1960. The unified soil classification system. Waterways Exp. , Vicksburg, Miss. DuMBLETON, M. J. 1968. The classification of soils for engineering purposes. Road Research Lab. Report LR 182. SKEMPTON, A. W. and BISHOP, A. W. 1954. Soils. In Building materials: their elasticity and inelasticity.
The air void ratio at the peak density remains very much the same. It may be seen that, at high water contents, there is little to be gained by increasing the compactive effort beyond a certain point. Since most natural soils in this country have water contents above the optimum for even the lightest plant, and since it is generally impracticable to dry the soil, 28 INTRODUCTION TO SOIL MECHANICS AND FOUNDATIONS little improvement in the dry density results from the use of heavier plant. Equally, extra passes of the equipment produce rapidly diminishing returns, once adequate compaction has been achieved.
These are formed of 'sandwiches' of one octahedral layer between two tetrahedral layers, as shown in Fig. 7. 0 • • ® Fig. 7 The structure of mica. oz= (OH)- = = A1 3+ or = Si 4 + Mel• 36 INTRODUCTION TO SOIL MECHANICS AND FOUNDATIONS Since the ions in both faces of the sheet are 0 2 -, there are no hydrogen bonds between successive sheets. However, about one quarter of the Si 4 + ions are replaced by Al3+ in the tetrahedral layers, and this leaves about one net negative charge for every four tetrahedral units.