Journal
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
Volume 20, Issue 3, Pages 332-338Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10298436.2017.1293265
Keywords
Reclaimed asphalt pavement; marginal lateritic soils; cement stabilisation; soil-water/cement ratio; unconfined compressive strength
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Funding
- Thailand Research Fund the TRF Senior Research Scholar program Grant
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In this research, marginal lateritic soil (LS) was used for improving the gradation properties of reclaimed asphalt pavement (RAP) prior to cement stabilisation for heavy and light-volume roads. The unconfined compressive strength (q(u)) of cement-stabilised RAP-marginal LS blends was found to increase with LS replacement due to the improvement of gradation properties and lower asphalt binder content. The soil-water/cement ratio (w/C) was successfully implemented for a particular RAP:LS ratio to integrate the effects of water and cement contents on strength development at the optimum water content and on the wet side of optimum. By incorporating a new parameter termed as the asphalt binder content (AS), a general strength relation equation was proposed for various water contents, cement contents and RAP:LS ratios. The general strength relation of cement-stabilised RAP-marginal LS blends is presented based on three critical material constants, which are A*, B* and k. The A* and B* constants mainly depends on curing time, while the k constant is essentially the same. The general strength relation was furthermore validated with measured strength data. The general strength relation is useful as a mix design tool for determining the optimal input of cement for various RAP:LS ratios to meet strength requirement for base and subbase applications. A mix design method with a minimum trial test is furthermore proposed in this paper.
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