Date of Award
Level of Access Assigned by Author
Master of Science in Civil Engineering (MSCE)
Second Committee Member
Third Committee Member
Structural lightweight aggregate concrete is not a new concept; however, pushing past the traditional methods of including normal weight fines while still receiving the strength and durability desired is a unique challenge especially at a 1680 kg/m3 fresh density. The lightweight aggregate concrete produced at this density was done so using 0-9.5mm expanded shale aggregate, 363 kg of cementitious material containing 50% type II Portland cement, 45% slag and 5% silica fume, and various admixtures, including Darex II, an air entraining admixture to achieve 8% air content.
A study was performed that compared compressive strengths and bulk electrical resistivities for varying levels of slag and silica fume to attempt to pin-point an optimal ratio. Levels of slag used were 15, 30, and 45% of total cementitious material, and for each slag level three levels of silica fume were used (3, 5, and 7% of total cementitious material). From this study the combination of 45% slag and 5% silica fume usage was derived and chosen to move forward with additional testing.
Additional testing performed included the following: quality control fresh concrete tests (slump, unit weight, and air content), short-term creep, free and restrained shrinkage, freeze-thaw, hardened air void, modulus of elasticity, modulus of rupture, equilibrium density, and underwater abrasion. Based on the tests completed, the lightweight aggregate concrete mixture containing 45% slag, 5% silica fume, and 50% type II Portland cement for cementitious materials to be adequate for use in marine environment applications.
MacDonald, Danielle L., "Development of a High-strength, Durable, Lightweight Concrete for Marine Applications" (2016). Electronic Theses and Dissertations. 2441.