𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Alkali-aggregate reaction in Nova Scotia II. Field and petrographic studies

✍ Scribed by M.A.G. Duncan; J.E. Gillott; E.G. Swenson

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
511 KB
Volume
3
Category
Article
ISSN
0008-8846

No coin nor oath required. For personal study only.

✦ Synopsis

Certain siliceous and sedimentary rocks in Nova Scotia, when used as aggregate with high alkali cement, have produced excessive expansion of concrete. Laboratory studies showed a type of alkali-aggregate reaction to be responsible. Rock types in structures and in aggregate sources were identified by petrographic examination, the main types being selected for study of alkali-reactivity.

SOMhKAIRE

/ En Nouvelle-Ecosse,l'utilisation de certaines roches siliceuses et s4dirnentaires comme granulat avec du cirnent riche en alcali a produit une dilatation excessive du b4ton. Des analyses en laboratoire en rendent responsable une sorte de r4action entre l'alcali et le granulat. On a identifi4 ces types de roche dans des structures et sources de granulat au moyen c'exarnens petrographiques, et on en a choisi les types principaux pour 4tude de re-activit4 de l'alcali.

πŸ“œ SIMILAR VOLUMES

Alkali-aggregate reaction in nova scotia
Alkali-aggregate reaction in nova scotia III. Laboratory studies of volume change
✍ M.A.G. Duncan; E.G. Swenson; J.E. Gillott πŸ“‚ Article πŸ“… 1973 πŸ› Elsevier Science 🌐 English βš– 645 KB

Studies of alkali-expansivity of Nova Scotia rock types included extensive length change tests of mortar bars and concrete prisms, and also rock cylinders immersed in alkali solution. The effects of such variables as alkali content, type of alkali, temperature, wet and dry cycling, anisotropy, opti

A discussion of the paper β€œalkali-aggreg
A discussion of the paper β€œalkali-aggregate reaction in Nova Scotia - character of the reaction”
✍ P.K Mehta πŸ“‚ Article πŸ“… 1974 πŸ› Elsevier Science 🌐 English βš– 208 KB

The authors have presented an interesting mechanism based on their laboratory studies on the expansion of phyllitic rocks due to alkali-aggregate reaction. In an investigation described below the writer found similar results. In proposing a mechanism of expansion, the authors suggested that it is si

A study of alkali-aggregate reaction in
A study of alkali-aggregate reaction in concrete: Measurement and prevention: Part I: Measurement - Development of rapid ar test method
✍ P.P. Hudec; J.A. Larbi πŸ“‚ Article πŸ“… 1989 πŸ› Elsevier Science 🌐 English βš– 436 KB

Results of accelerated tests for screening potentially reactive concrete aggregates are presented. The tests were performed using a newly developed, computer-controlled Double LVDT instrumentation. A statistical analysis of data obtained from the test indicates that high and significant correlations