A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sulfate Expansion in Cement-Treated Bases
Over the years the Wyoming Department of Transportation (WYDOT) has successfully used cement-treated base (CTB) for highway construction. However, two recently built pavement sections have developed transverse bumps resembling frost heaves across the entire width of the roadway. Cement-treated base is a mixture of portland cement, aggregate, and water, but has a lower cement content than ordinary portland cement concretes (PCC). It is vulnerable to weakening and expansion caused by sulfates in the aggregate, particularly when clays are present. The objectives of this research were to: develop laboratory test methods to simulate field expansion of cement-treated base; establish which material property(s) caused expansion of the CTB; develop specifications to prevent sulfate related expansion of cement-treated base; and evaluate the effect of fly ash on sulfate attack in cement-treated base. Based on these analyses, changes to the current WYDOT specifications governing aggregate used in CTB are proposed.
Sulfate Expansion in Cement-Treated Bases
Over the years the Wyoming Department of Transportation (WYDOT) has successfully used cement-treated base (CTB) for highway construction. However, two recently built pavement sections have developed transverse bumps resembling frost heaves across the entire width of the roadway. Cement-treated base is a mixture of portland cement, aggregate, and water, but has a lower cement content than ordinary portland cement concretes (PCC). It is vulnerable to weakening and expansion caused by sulfates in the aggregate, particularly when clays are present. The objectives of this research were to: develop laboratory test methods to simulate field expansion of cement-treated base; establish which material property(s) caused expansion of the CTB; develop specifications to prevent sulfate related expansion of cement-treated base; and evaluate the effect of fly ash on sulfate attack in cement-treated base. Based on these analyses, changes to the current WYDOT specifications governing aggregate used in CTB are proposed.
Sulfate Expansion in Cement-Treated Bases
G. Huntington (author) / K. Ksaibati (author)
1995
150 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Highway Engineering , Construction Materials, Components, & Equipment , Materials Degradation & Fouling , Cements , Sulfate , Expansion , Pavement bases , Test methods , Plastic properties , Limestone , Gypsum , Clays , Flyash , Aggregates , Chemical , Highways , Construction materials , Wyoming , CTB(Cement-treated base) , Scoria
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