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SUMMARY:Low cost roads and critical states (CS) - Professor Andrew Schofie
 ld\, Emeritus Professor of Engineering\, CUED
DTSTART:20081114T163000Z
DTEND:20081114T173000Z
UID:TALK15035@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:From mid 1951 to mid 1954 I worked in Africa with consultant e
 ngineers Scott & Wilson (S&W) in the then Nyasaland Protectorate (now Mala
 wi). \nFailure of clayey laterite in Chileka airfield pavement had led S&W
  to specify use of costly crushed-stone in subsequent pavement constructio
 n. \nAfter my tests showed that 3% of slaked lime reduced the plasticity i
 ndex of clayey lateritic gravel\, I built a successful experimental paveme
 nt of stabilised gravel. I had to develop air-photo location of gravel bor
 row-pits before road pavements could be constructed of stabilized gravel\,
  but road-cost/mile was halved in 1954/5 S&W contracts. As a research stud
 ent in\n1954/5 I found that published shear box and triaxial test paths of
  disturbed soil (both drained and undrained) approached a CS line\, from w
 hich it later\n(1) followed that a compact aggregate of grains can act as 
 a plastic continuum\; should this new understanding alter geotechnical eng
 ineer's performance or costs?\n\n
LOCATION:Engineering Department - LR6
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