CEMENTITIOUS STABILISATION OF ROAD CONSTRUCTION MATERIALS: QUO VADIS

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CEMENTITIOUS STABILISATION OF ROAD CONSTRUCTION
MATERIALS QUO VADIS

• Phil Paige-Green,
• CSIR-Transportek, Pretoria
• Frank Netterberg
• Consultant

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INTRODUCTION

• Stabilisation of marginal materials is still an
  important part of road building in RSA
• Will probably become more important as good
  materials are depleted
• Specification of stabilisation is based on
• COLTO Standard Specs for RB (1996)
• with assistance from Draft TRH 13 (1986)

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INTRODUCTION

• 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)
• Things have changed !!

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SABS ENV 197-1

• In 1992, became a European pre-standard (ENV)
• After 3 years should be upgraded to European
  standard (EN) ??
• Adopted as is by SABS in 1996 for RSA
• Applicable to common cements
• Similar spec for masonry cements (SABS ENV 413-1)
• Concentrate on SABS ENV 197-1 as this is most
  relevant for roads

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NEW REQUIREMENTS

• Totally different classification system
• 5 cement types
• 9 groups (depend on additive)
• 19 subgroups (depend on composition)
• Also classified by strength and rate of strength
  gain (6 additional permutations)

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CLASSIFICATION

• I Portland cement
• II Other Portland cements
• Portland slag cement
• Portland silica fume cement
• Portland flyash cement
• Portland limestone cement
• Portland composite cement
• III Blastfurnace cement
• IV Pozzolanic cement
• V Composite cement

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Strength requirements
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STANDARD DESIGNATION

• Cement ENV 197-1 CEM I 32.5
• (equiv to OPC ?)
• Cement ENV 197-1 CEM II/A-S 42.5

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CHEMICAL PROPERTIES
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PHYSICAL PROPERTIES
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PHYSICAL PROPERTIES (cont)
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STRENGTH
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Strength requirements
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CHEMICAL PROPERTIES
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PHYSICAL PROPERTIES
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PHYSICAL PROPERTIES (cont)
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STRENGTH