Micropiles – An Overview Micropiles – An Overview - AGC

Grouting (Including Post-Grouting)
Methods Vary But Can Have Major Impact on Micropile Capacity
• “Most” Important Considerations
‣ Water/cement (w/c) ratio 0.40 to 0.50;
Pre-construction testing, specifications (grout QC plan),
construction monitoring
‣ After completion of grouting, no significant loss of grout in
load bearing zone;
Monitor grout take, grout to refusal, pre-grout, re-grout
‣ For Type B micropiles, consider possibility that target
pressure may not be fully obtained during installation
Include verification load test program and proof testing of
suspect piles in specifications