Chemilink Stabilization Technologies for Roads & Airfields for Roads & Airfields

78 Pages·2011·15.9 MB·English

Seminar on Soil Sub-grade Stabilization
Organizer by: Jambatan Kerja Raya Malaysia, Road Engineering Association of Malaysia
15 July 2008, Legend Hotel, Kuala Lumpur, Malaysia
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Chemilink Stabilization Technologies
ffoorr RRooaaddss && AAiirrffiieellddss
Dr Wu Dong Qing Tan Poi Cheong
________________________________________________________________________________________________________
Chemilink Technologies Group, Singapore
Table of Contents
凯凯凯凯凯凯凯凯密密密密密密密密林林林林林林林林克克克克克克克克™™
1. Introduction
2. Chemical-Soil Stabilization
33.. DDeessiiggnnss aanndd AApppplliiccaattiioonnss ooff CChheemmiiccaall SSttaabbiilliizzaattiioonn
4. Case Studies of Chemilink Stabilization/Recycling
5. Quality Assurance and Quality Control
6. Conclusions
7. References
1. Introduction
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(cid:1) Conventional pavement construction methods cannot commonly
meet the latest requirements. Stronger pavements with bounded
materials have to be used for heavier loadings with higher frequency
(cid:1) New construction methods such as “floating” semi-rigid platform
have to used for pavement over the weak soil region
(cid:1) Local soils have to be used for the regions lacking of the quarries
and for environment protection
(cid:1) Faster construction method is always top important for airfields,
especially for the airports under operations
(cid:1) In-situ soil stabilization is an proven solution with overall cost
effectiveness
1. Introduction
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Key Advantages of Chemical Stabilization:
(cid:1)
Higher strength to meet for different requirement
(cid:1)
Better volume stability, lower permeability and longer
dduurraabbiilliittyy
(cid:1)
Forms a semi-rigid platform so as to deliver a lot of engineering
benefits
(cid:1)
Most soils or construction wastes can be chemically
stabilized
(cid:1)
Simple and fast construction
2. Chemical Stabilizing Agent
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Chemical-Soil Stabilization –
Mixing proper chemicals with in-situ soils to
improve/strengthen the soil properties through chemical
reactions for engineering purposes
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(cid:1) (cid:1)
Cementation Precipitation Polymerisation
(cid:1) (cid:1)
Hydration Oxidation
(cid:1) (cid:1)
Ion exchange Carbonation
(cid:1)
Flocculation
2. Chemical Stabilizing Agent
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Commonly Used Chemical Stabilizing Agents:
(cid:1)
Cement
(cid:1)
Lime
(cid:1)
Bituminous Materials
(cid:1)
Fly-ash
(cid:1)
Modified Cementitious Chemical – Chemilink
(cid:1)
Liquid form Stabilizing Agents
2. Chemical Stabilizing Agent
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2-1 Cement
(cid:1)
Generally, it is effective for granular soils but ineffective
for cohesive soils
(cid:1)
Applicable ranges:
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2) Plastic Limit: <18-20%
3) Coefficient of Uniformity: >5-10
4) Grain Size Distribution
2. Chemical Stabilizing Agent
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2-1 Cement
(cid:1)
Advantages:
1) Low cost
2) Simple construction
(cid:1)
Disadvantages:
1) Serious shrinkage
2) Limited ranges of application
3) Unsuitable for high in-situ moisture content
2. Chemical Stabilizing Agent
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2-2 Lime
(cid:1)
Suitable for clayey soil
(cid:1)
Used for sub-grade and sub-base or other pavement
layers with lower bearing capacity requirements.
(cid:1)(cid:1)
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subsequent treatment with other chemical stabilization
2. Chemical Stabilizing Agent
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2-2 Lime
(cid:1)
Advantages:
1) Reducing the plasticity index,
2) Decreasing the clay content substantially
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4) Drying out the water from wet soils
5) Reducing the shrinkage and swelling
(cid:1)
Disadvantages:
1) Low Durability
2) Lower strength increment compared with cement stabilization