Investigation of Expanding Grout and Concrete. Report 1. Preliminary Studies

摘要

Portland cement and grout are construction materials used in widely varied types of structures. One of the major disadvantages of these materials is drying shrinkage. Researchers have worked on this problem for many years, and technology has advanced to the point where products are now being manufactured which when used in protland-cement concrete can cause expansion to counteract shrinkage or, depending on amounts used, cause positive expansion. Two expansive mixtures were investigated in the program described herein: Type K expansive cement, which consists of portland cement clinker, anhydrous calcium aluminate sulfate, lime (CaO), and calcium sulfate (CsSO4); and Type M expansive cement, which is a mixture of portland cement, calcium aluminate cement, and calcium sulfate. The purpose of the research effort was to develop expansive concrete and grout mixtures for use in structures in connection with underground nuclear testing. (Author)