Case Study – Shinfield Studios
Contractor – O’Keefe
Target : Soil Geotechnical properties improvement & limit impact of sulfate swell.
On-site soil samples were recovered from trial holes and assessed:
Test trials were performed to assess impact of Lime+GGBS addition over:
DESIGN REQUIREMENTS for STABILISED SOIL
CBR Value |
Compacted Dry Density |
≥ 5% |
≥ 95% of MDD |
Results & Recipe validation
|
|
Optimum Moisture Content |
Maximum Dry Density |
Sample 14 |
+2% Lime |
23.5% |
1.59 |
+2% Lime + 1% GGBS |
23.3% |
1.59 |
|
Sample 15 |
+2% Lime |
24.3% |
1.57 |
+2% Lime + 1% GGBS |
25.0% |
1.57 |
No impact of GGBS addition/combination to a lime treatment over the on-site soil samples:
Small additions of GGBS over your current lime treatment will not affect compaction operation and preparation.
Assessing the linear expansion (TPS swelling risk) after 28 days with variations in Lime+GGBS addition
|
|
Sample 2 |
Sample 4 |
Sample 5 |
Sample 7 |
TPS |
0.85% |
1.10% |
1.60% |
0.97% |
|
Linear expansion after 28 days |
+2% Lime |
0.20% |
1.35% |
1.79% |
0.72% |
+2% Lime +1% GGBS |
0.12% |
2.01% |
1.40% |
0.45% |
|
+2% Lime +2% GGBS |
0.06% |
1.38% |
1.35% |
0.26% |
In all cases, the addition of GGBS addition on top of 2% allow for reduction in swelling after 28 days
Final recipe selected for further (on-site) trial: +2% Lime +1% GGBS
|
|
Linear Expansion @7 days |
CBR value |
Sample 14 |
None |
0.02% |
1.7% |
+2% Lime |
0.22% |
19% |
|
+2% Lime +1% GGBS |
0.07% |
27% |
|
Sample 15 |
None |
0.11% |
4.5% |
+2% Lime |
0.65% |
15% |
|
+2% Lime +1% GGBS |
0.13% |
24% |
All Lime + GGBS treatments on on-site soil samples enabled:
BENEFITS
High efficiency of Soil Stabilisation obtained with ECOCEM GGBS.
A Durable and Low-Carbon solution for your geotechnical works.