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Expanded Clay lightweight aggregates for Civil Engineering applications

Expanded Clay lightweight aggregates for Civil Engineering applications. Arnstein Watn, SINTEF, Norway Oddvar Hyrve, maxit Group, Norway Inge Brorsson, SGI, Sweden, Liaison TC 227. Expanded clay LWA. Ceramic grains produced by expanding clay Grain size up to 32 mm

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Expanded Clay lightweight aggregates for Civil Engineering applications

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  1. Expanded Clay lightweight aggregates for Civil Engineering applications ArnsteinWatn, SINTEF, Norway Oddvar Hyrve, maxit Group, Norway Inge Brorsson, SGI, Sweden, Liaison TC 227

  2. Expanded clay LWA • Ceramic grains produced by expanding clay • Grain size up to 32 mm • Loose bulk dry density: 260-350 kg/m3 • Design unit weight (incl compaction and water): 4.5 - 6 kN/m3 • Thermal conductivity: 0.1-0.16 W/mK (water content) • High Permeability: k > 10-3 m/s

  3. Application areas Backfill for bridge abutment Frost insulation in road Weight reduction in slope Frost insulation in drainage ditch

  4. Background • R&D-project MiljøIso and LWA Geolight • Material characteristics • Design recommendations • Construction guidelines • Quality control in the field • Material characterisation • Required properties • Relevant test methods • Standardisation • CEN TC 154 • EN 13055 Light weight aggregates (all types) • CEN TC 88 • EN 14063 Thermal insulation products-in situ formed expanded clay LWA • prEN 14933/prEN14934 EPS/XPS for CEA • CEN TC 227 – Required standard for expanded clay LWA for CEA

  5. CEN TC 88 – WG 20 • Product standard for expanded clay LWA for CEA • Required characteristics • Relevant test methods • Marking and labelling • Factory production control • Required characteristics • Physical, mechanical, thermal, hydraulic, durability, environmental • Characteristics based on existing standards • Supplementary characteristics for this product and application • Test methods • Methods from existing standards • Modified existing test methods • New methods for this specific application

  6. Existing test methods Compressibility and compressive strength Water suction

  7. Modified test methods • Particle size distribution – revised procedure • Water absorption – supplementary testing • Shear strength static loading – specification of procedure

  8. New test methods Triaxial testing Compressive creep

  9. Implications • Basis for requirements and characterisation • Basis for material quality control • Basis for design properties (needs confirmations) • Basis for comparison of different materials • Good basis also for characterisation and testing other materials

  10. Quality control in the fieldTechnical report • Quality of the material delivered on site • Quality of the construction work • Installation • Compaction • Quality control of the material as part of the structure • Installed quality • Structural behaviour

  11. On site sampling – LEHA-method

  12. Structural behaviour – plate load test On top of bearing layer On top of complete structure

  13. Summary • Product standard sent for CEN Enquiry • Required characteristics • Relevant test methods • Marking and labelling • Factory production control • Technical report under preparation • Delivery control on site • Construction work recommendations • Installation • Compaction • Structural quality control

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