Initial Consumption of Lime for stabilised subbase materials
Initial Consumption of Lime for stabilised subbase materials
(OP)
According to BS1924:Part2:1990 require the materials to be stabilised with a certain percent of cement to be assessed first by determining the initial consumption of lime/cement.Which in principle the minimu and the maximum required initial consumption of lime for tropical soils/gravel materials?





RE: Initial Consumption of Lime for stabilised subbase materials
Therefore the recommendations from BS 1924 suggest that mix design trials should be started at the Initial Consumption of Lime PLUS 0.5%, i.e. 0.5% lime is used to stabilise the soil AFTER the pH has been raised to >12. This is just the start of the process, if the resultant 7 day strength fails to meet the specification requirement [end-performance] then further lime is used and the resultant strength determined. If the soil is unable to achieve the required strength, consideration is then given to the use of other binders including cement [OPC]. BS 1924 suggests that where the ICL is > 5%, it may be uneconomical to use stabilisation, however this document is now some years old and the economics have changed.
I would suggest that you also refer to the following document HA 74/07 which can be downloaded for free from http://www
This document is produced by the Highways Agency in the UK and discusses the testing and specification of Capping replacement materials for road pavement design and is very useful in organising mix design trials.
Finally, please note that there are two processes which can be accomplished by using lime, the first is modification which is a short term improvement in the material and does not need the pH to be in excess of 12, the second is 'true' stabilisation which is a long-term process and requires the formation of cementitiuos products.
I hope this helps, basically the lower bound value will be the ICL plus 0.5%, the upper value will be cost driven.
RE: Initial Consumption of Lime for stabilised subbase materials