A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Admixed chlorides in concrete: History, impacts, and standardization
The presence of chlorides in cementitious materials results in corrosion of the embedded metallic materials. Early construction practices (pre 1960s) relied on admixed calcium chloride to accelerate the early strength gain of concrete. Until the 1950s, few publications focused on the effects of chlorides in concrete on corrosion and the use of chlorides was well established. However, in the 1960s significant publications reported on the effects of chlorides on the corrosion of prestressed wires and strands - these publications were the result of several failures of prestressed systems. Later, significant research was performed on the corrosion of steels in cementitious materialsa significant portion of this work attributable to the researchers being recognized in this symposium: Brian Hope and Morris Schupack. Their considerable efforts led to new knowledge regarding corrosion durability of reinforced and prestressed systems. Recently, ACI Committees 201 and 222 standardized limits on allowable admixed chlorides in the constituent materials. However, more standardization is neededACI Committees 318 and 349 report different admixed chloride limit requirements than Committees 201 and 222. This paper provides an overview of past research, analyzes the effects of chlorides on service life and economy and provides data from a research project. Using this information, the authors propose a standardized limit for chlorides in concrete.
Admixed chlorides in concrete: History, impacts, and standardization
The presence of chlorides in cementitious materials results in corrosion of the embedded metallic materials. Early construction practices (pre 1960s) relied on admixed calcium chloride to accelerate the early strength gain of concrete. Until the 1950s, few publications focused on the effects of chlorides in concrete on corrosion and the use of chlorides was well established. However, in the 1960s significant publications reported on the effects of chlorides on the corrosion of prestressed wires and strands - these publications were the result of several failures of prestressed systems. Later, significant research was performed on the corrosion of steels in cementitious materialsa significant portion of this work attributable to the researchers being recognized in this symposium: Brian Hope and Morris Schupack. Their considerable efforts led to new knowledge regarding corrosion durability of reinforced and prestressed systems. Recently, ACI Committees 201 and 222 standardized limits on allowable admixed chlorides in the constituent materials. However, more standardization is neededACI Committees 318 and 349 report different admixed chloride limit requirements than Committees 201 and 222. This paper provides an overview of past research, analyzes the effects of chlorides on service life and economy and provides data from a research project. Using this information, the authors propose a standardized limit for chlorides in concrete.
Admixed chlorides in concrete: History, impacts, and standardization
Gemischte Chloride im Beton: Geschichte, Auswirkungen und Standardisierung
Trejo, David (author) / Weyers, Richard (author)
2012
20 Seiten, 9 Bilder, 5 Tabellen, 40 Quellen
Conference paper
English
| British Library Online Contents | 2002
Binding of chloride in mortar containing admixed or penetrated chlorides
| Tema Archive | 1994
Binding of Chloride in Mortar Containing Admixed or Penetrated Chlorides
| British Library Online Contents | 1994