Presentation on theme: "CEMENTITIOUS STABILISATION OF ROAD CONSTRUCTION MATERIALS: QUO VADIS Phil Paige-Green, CSIR-Transportek, Pretoria Frank Netterberg Consultant."— Presentation transcript:
CEMENTITIOUS STABILISATION OF ROAD CONSTRUCTION MATERIALS: QUO VADIS Phil Paige-Green, CSIR-Transportek, Pretoria Frank Netterberg Consultant
INTRODUCTION l Stabilisation of marginal materials is still an important part of road building in RSA l Will probably become more important as good materials are depleted l Specification of stabilisation is based on: –COLTO Standard Specs for R&B (1996) –with assistance from Draft TRH 13 (1986)
INTRODUCTION l Cement stabilisation experience incorporated in COLTO and TRH13 was based mainly on the use of: –Ordinary Portland Cement (SABS 471) –PBFC (SABS 626) –Portland cement blends (SABS 831) –Portland flyash cement (SABS 1466) l Things have changed !!
SABS ENV 197-1 l In 1992, became a European pre-standard (ENV) l After 3 years should be upgraded to European standard (EN) ?? l Adopted “as is” by SABS in 1996 for RSA l Applicable to “common cements” l Similar spec for masonry cements (SABS ENV 413-1) l Concentrate on SABS ENV 197-1 as this is most relevant for roads
NEW REQUIREMENTS l Totally different classification system l 5 cement types –9 groups (depend on additive) l 19 subgroups (depend on composition) l Also classified by strength and rate of strength gain (6 additional permutations)
CLASSIFICATION l IPortland cement l IIOther Portland cements l Portland slag cement l Portland silica fume cement l Portland flyash cement l Portland limestone cement l Portland composite cement l IIIBlastfurnace cement l IVPozzolanic cement l VComposite cement