ACI Concrete International · 1992 · 19 citations · 0 references
EngineeringMaterials EngineeringMaterials ScienceBuilding MaterialsMistakeStructural EngineeringCementing OperationsCementitious MaterialsConcrete ConstructionConcrete MaterialsConcrete TechnologyCorrosion In ConcreteBond CoatsCementitious Repair MortarsConcrete RepairConcrete Repair MaterialsCuring ConditionsFly Ash ConcreteSurface CoatsSurface Treatment Of Cements
This is the last in a series of 3 articles that discuss mistakes, misconceptions, and controversial issues concerning concrete and its repair that have led to failures, poor performance, unnecessarily strict specifications, over-inspection, extra work, and extra costs. This paper discusses the following situations: do not mechanically roughen a surface to improve bond; wetting a surface prior to placing can reduce bond; grout and mortar bond coats usually are not necessary; latex emulsions can reduce rather than improve bond; problems and limitations of epoxy; dense and watertight coatings can cause failures; set times of cements do not tell the set time of concrete; direct substitutions of fly ash for cement give wrong batch proportions; and curing is often misunderstood and underutilized.