The resistance to chloride penetration is one of the most important measures of the durability of concrete. Results are presented from a study of the chloride resistance of concrete with high-volume slag cement at early ages. Charge passed (ASTM C1202) and chloride penetration coefficient (NT BUILD 443) were studied at early ages by heat curing to a maximum temperature of 75°C. The results show a good correlation between charge passed and chloride penetration coefficient between standard curing and heat curing

This article provides a simplified calculation method for estimating deflections of two-way slabs in multi-story buildings. Early-age loading and its effects on concrete properties (elastic and creep behaviors) are incorporated. The method is implemented in a spreadsheet format, allowing users to investigate the effects of slab dimensions, design loads, and shoring/reshoring scenarios on long-term deflections. The method is shown to provide good agreement with data from laboratory tests of slabs

A 50-year-old sidewalk was crushed and left in place as the base for a new concrete overlay reinforced with macrosynthetic fibers. Microsynthetic fibers, typically added in lower volumes, are intended to reduce plastic shrinkage. The heavier macrofibers, typically added in higher volumes, provide distribution of drying shrinkage stresses. This results in many fine, tight microcracks and control joints that open less and offer better resistance to impact and fatigue stresses. The sidewalk’s performance over its first four years is reported