Development of Magnesium Phosphate Cement (MPC) Concrete Mixture Proportioning for Airfield Pavements: Laboratory and Field Validation MPC
Abstract
Magnesium phosphate cements (MPCs) have been used in proprietary products for pavement repairs for over 30 years. However, these products generally are intended for small repair sections less than 0.5 ft due to high heat generations and short working times. The objective of this research was to develop optimal mixture proportions of MPCs for use in pavement applications. Materials used in this research included three types of magnesium oxide (MgO), one phosphate salt, two types of fly ash, a retarder, two course aggregate gradations, and one sand. From these materials, 24 mixture proportions were batched with variations including water content, retarder, and fly ash to determine the effects on physical and mechanical properties. Laboratory testing at various scales was conducted on a mixture consisting of a dead-burned MgO, potassium dihydrogen phosphate, Class C fly ash, boric acid, and local aggregates. Four variations were developed and commercially blended in bulk super sacks. These concrete mixtures met the workability, setting time, and strength requirements. A volumetric mixer was used to batch 2 yd field placements in test sections 8.5 ft wide x 8.5 ft long x 8 in. deep. This was noteworthy because no literature was discovered for MPC concrete placements at this large volume.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2020
- Accession Number
- AD1091295
Entities
People
- Charles Jr A. Weiss
- D.A. Scott
- Jeb S. Tingle
- Monica A. Ramsey