Title: Labcrete, Realcrete, and Hypocrete Where We can Expect the Next Major Durability Problems
Author(s): K. Newman
Publication: Symposium Paper
Appears on pages(s): 1259-1286
Keywords: alkali-aggregate reactions; concrete construction; concrete durability; construction materials: corrosion; deterioration; high-alumina cements; mix
proportioning; siliceous aggregates; specifications; structural desiqn
This paper tries to draw lessons from major failures in the past two decades in the UK and gives a personal view as to why we still have problems in concrete today. Definitions are given of "Labcrete", "Realcrete" and "Hypocrete" and an examination is made of recent difficulties in the UK involving high-alumina cement, corrosion of reinforcing steel, alkali-silica reaction, and the definition of criteria for durability. A prediction is then made as to why and where further deterioration of concrete structures can be expected in the next 10 to 20 years. Finally, proposals are made for overcoming durability problems in the longer term; Above all there is a need to integrate our knowledge and understanding of the mechanisms of deterioration with concrete design, materials, methods of construction, and use.