Influence of content and maximum size of light expanded clay aggregate on the fresh, strength, and durability properties of self-compacting lightweight concrete reinforced with micro steel fibers

摘要

The effects of maximum size of aggregate (d(max)) light expanded clay coarse aggregate (LECA) content, and volume fraction of micro steel fibers (V-f) on the properties of self-compacting lightweight concrete (SCLWC) were investigated. A total of 18 mixes with d(max) of 10, 14, and 20 mm, LECA contents of 50% and 100%, and V-f of 0.25, 0.5, and 0.75% were prepared. The investigated fresh properties were fresh density, slump flow, T-50 cm, V-funnel flow time, and L-box height ratio, while the investigated hardened properties were compressive strength, flexural strength, oven dry density, water sorptivity, drying shrinkage and weight loss. The results revealed that increasing d(max) led to decrease the superplasticizer dosage required to keep the slump flow at 700-750 mm. The d(max) of 10 mm gave the best compressive and flexural strengths. The water sorptivity was generally higher as the d(max), LECA content, and V-f increased. The drying shrinkage, on the other hand, was generally diminished with increasing d(max) and V-f. (C) 2019 Elsevier Ltd. All rights reserved.