Materials for Emergency Repair of Runways.
Abstract
The purpose of the investigation here was to test four inorganic cementing materials, and screen out from further investigation those that are obviously unsuitable for the fulfillment of the requirements for emergency repair of concrete runways under war conditions. The four materials are SET-45 cold formula; SET-45 hot formula; Aluminum phosphate (AlP cement; and Jet cement. In addition, a 50/50 blend of the SET-45 cold and hot formulas was investigated, and a portland cement of Type III was tested for the sake of comparison. The SET-45 formulas and the AlP cement are based on magnesium oxide. The Jet cement is a modified portland cement. A combination of mechanical testing and physicochemical examinations was used. The mechanical testing concentrated on the early strength developing capabilities of the cements under room temperature. On this basis the cements of magnesium oxide content, that is the SET-45 formulas appear to be the most suitable for the project. For instance, the SET-45 cold formula can produce compressive strengths in excess of 10,000 psi at the age of 1 hour with low water contents. Even with high water content, enough to produce flowing consistency, the 1-hr strengths are regularly over 3,000 psi. The corresponding setting time of this formula, however, is usually less than 10 minutes even at room temperature. The setting time of SET-45 hot formula is much longer, however its one-hour strength is also reduced. The blend of the two formulas displays in-between strengths and times of setting.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1984
- Accession Number
- ADA146139
Entities
People
- S. Popovics
Organizations
- Drexel University