الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 290 |  |  |
| | | from | 290 | | |
Abstract
The alkali-reactivity of various egyptian aggregates has been investigates using different analytical and mechanical test methods.Six egyptian aggregates representing a wide range of mineralogical composition and peetrographic facies were evaluated.Three canadian aggregates; spratt; pittsburg and dolomite, were utilized as reference alkali-silica reactive, alkali-carbonate microbar test CMBT for evaluating alkali-silica and alkali-carbonate reactivity of egyptian aggregates has been proposed.A practical and economical method for sample preparation of the rock cylinder test was recommended as well.
The effect of various levels of expansion due to alkali-carbonate reaction on the engineering properties of concrete such as strength and permeability was examined.The vairous expansion levels were produced using concrete mixes containing highly-reactive, marginally reactive , and non-reactive aggregates.Low alkali cement LAC and adquate mineral admixtures such as fly ash FA, silica fume SF ,metakaolin MK , slag or ternary blends of FA/SF or flag/SF were proposed as preventive measures for AAR-induced expansion of egyptian aggregates.The gactors affecting the expansion due to alkali-aggregate reaction AAR of egyptian carbonate such as alkalis level, temperature and clay minerals content, were studied.the mechanism of AAR for representaive egyptian aggregate sources was also investigated.