Combined use of calcium chloride and fly ash in road base stabilization

Chang Seon Shon, Donald Saylak, Surendra K. Mishra

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Chemical stabilization with cementitious and chemical additives such as portland cement, lime, fly ash, and calcium chloride (CaCl 2) is now being extensively used in road base or subgrade primarily to enhance mechanical strength and improve resistance to chemical attack, resulting in a more durable roadway. In recent years, there has been renewed interest in the combined use of these additives to induce a synergistic effect on the strength, as well as to improve deficiencies of a single-chemical treatment process (e.g., slow early strength development of fly ash and susceptibility to leaching of CaCl 2 in wet environments). The effect of adding CaCl 2 to the fly ash-treated roadbed during construction was investigated. The role of CaCl 2 in the system was studied, where determination was made as to how the soluble calcium species plays a role in bringing particles closer in the aggregate system and how it has an effect on the setting time, compaction efficiency, and ultimate strength. Laboratory test data revealed that the addition of CaCl 2 not only accelerated the setting rate but also increased the initial and long-term strength of the constructed roadbed. On the basis of these laboratory tests, a mathematical model was developed that predicts the strength of the composites. Finally, field performance data showed that fly ashes can be effectively used in road construction if CaCl 2 is added to the system.

Original languageEnglish
Pages (from-to)120-129
Number of pages10
JournalTransportation Research Record
Issue number2186
DOIs
Publication statusPublished - Dec 1 2010
Externally publishedYes

Fingerprint

Calcium chloride
Fly ash
Stabilization
Chemical attack
Road construction
Portland cement
Lime
Leaching
Strength of materials
Calcium
Compaction
Mathematical models
Composite materials

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering

Cite this

Combined use of calcium chloride and fly ash in road base stabilization. / Shon, Chang Seon; Saylak, Donald; Mishra, Surendra K.

In: Transportation Research Record, No. 2186, 01.12.2010, p. 120-129.

Research output: Contribution to journalArticle

Shon, Chang Seon ; Saylak, Donald ; Mishra, Surendra K. / Combined use of calcium chloride and fly ash in road base stabilization. In: Transportation Research Record. 2010 ; No. 2186. pp. 120-129.
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