Laterite Road Building - Definition Question
Laterite Road Building - Definition Question
(OP)
Looking for some help on definition terminology.
In a document on laterite roads the following data is presented
Base properties
PI = 15, P425 = 48; PM = 720
CBRs @ 98% BS Heavy = 24%
Cum. Traffic to end 2003 = 0.28 MESA
My question -
1) P425 represent a fraction but on what scale. is this percent passing 425 um sieves
2) What does PM stand for - I'm guessing screen size but would expect to see 710 um
3) BS Heavy - I understand what CBR is and associated percentage.
3) What does MESA stand for - I think Million Equivalent Single Axials
Thanks in advance
In a document on laterite roads the following data is presented
Base properties
PI = 15, P425 = 48; PM = 720
CBRs @ 98% BS Heavy = 24%
Cum. Traffic to end 2003 = 0.28 MESA
My question -
1) P425 represent a fraction but on what scale. is this percent passing 425 um sieves
2) What does PM stand for - I'm guessing screen size but would expect to see 710 um
3) BS Heavy - I understand what CBR is and associated percentage.
3) What does MESA stand for - I think Million Equivalent Single Axials
Thanks in advance





RE: Laterite Road Building - Definition Question
2. PM = Plastic Modulus
3. BSH = British Standard Heavy Compaction
Tests involving moisture-density relationships, CBR and unconfined compression were carried out using the British Standard Heavy (BSH) energy level. If the British Standard Light (Proctor) compaction mould is utilised, the compactive effort for the BSH consist of the energy derived from a 4.5kg rammer falling through 45cm onto five layers, each receiving 27 blows. When the CBR mould is used, the BSH compactive effort is also derived from a 4.5kg receiving 62 blows in five layers (Osinubi 1998). Compaction was only carried out at BSH energy level to simulate the maximum expected strength gain that can be achieved on site.
4. MESA = Million equivalent standard axles
RE: Laterite Road Building - Definition Question