Soil Modification and Stabilisation using Lime and Cement
North Calvert
JJM2628 – Stabilisation for Haul Roadn
Project
JJM2628 – Stabilisation for Haul Road
Location
North Calvert
Client
Buckingham
Key works delivered
Soil Modification and Stabilisation using Lime and Cement
Project Duration
May 2022 - 4 weeks
Stabilised Area
10 000 m2
Earthworks
By Buckingham
PROJECT OVERVIEW
New Haul Road for future Earth Works and Large-Scale muck shifting.
Two-part process required with Lime and Cement Binders.
5000m 3 of 7A material excavated from nearby Attenuation Pond which was modified with Lime to create the embankment.
Client Requirement min >30% CBR on 300mm Layer.
JJMac tested and classified the material as suitable to achieve these requirements.
PROJECT CHALLENGES
The project was very challenging due to the loading required from 300mm Layer. The Haul Road is to be used to cart excavated material with some 50No 45tn Dump trucks trafficking every day.
A combination of Lime and Cement was used to acheive the required loadings. A period of mellowing was required to allow the Lime to breakdown the Clays. The mellowing period and follow on cement works had to be co-ordinated to ensure all works were trimmed and compacted before the end of each shift.
Management of Logistics and deliveries of Binder are challenging on HS2 with prebooking and certifified delivery trucks etc only allowed on site.
ENGINEERING AND SOLUTIONS TO OVERCOME THE CHALLENGES
To overcome the project challenges set by the client, our team:
Worked with the client and advised on the findings of the site won material testing and classification.
Setting out a programme of works for each area broken down into Lime and Cement activities with the Mellowing periods indicated. The challenge being to Modify the In-situ material by mixing with lime to Modify and then mixing with Cement to Stabilise. All complying with the stringent testing schedule for the 7A material.
The challenge was to Remediate the site and leave ready for Piling and follow on Groundworks.
JJMac range of capabilities meant that we could remediate the site of contaminated materials and use the clean inert material as a Stabilised Capping over the contaminated material that is left in-situ.
The 600mm Stabilised Capping Layed acted as a Piling Mat under the footprint of the Plots. Saving on Disposal and Imported Aggregates.
EARTHWORKS AND STABILISATION DURING CONSTRUCTION PHASE
JJMac Site HS2 Team 7A Soil being mixed after mellowing with Lime and 7A material ready for Cement Stabilisation
All Earthworks and Drainage carried out by JJMac working as Principle Contractor.
COMPLETED WORKS
ADVANTAGES
The works had numerous advantages to this site.
Utilise site won material from Excavations for Modification.
Elimination of Primary Aggregates for Haul Road Capping Base.
Elimination of Stone Lorries from the Villages and surrounding Roads