منابع مشابه
Diagnosis and Control of Alkali - Aggregate
Aggregates containing certain constituents can react with alkali hydroxides in concrete. The reactivity is potentially harmful only when it produces significant expansion (Mather 1975). This alkali-aggregate reactivity (AAR) has two forms—alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR, sometimes called alkali-carbonate rock reaction, or ACRR). ASR is more often a concern than A...
متن کاملDiagnosis and Control of Alkali - Aggregate Reactions
Aggregates containing certain constituents can react with alkali hydroxides in concrete. The reactivity is potentially harmful only when it produces significant expansion (Mather 1975). This alkali-aggregate reactivity (AAR) has two forms—alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR, sometimes called alkali-carbonate rock reaction, or ACRR). ASR is more often a concern than A...
متن کاملReactivity in Recycled Concrete Aggregate
Full scale tests with crushed concrete used in sub-bases in roads show that the material has capacity to reharden, very slowly but also after prolonged periods of time. The rehardening process in crushed concrete aggregate has been analysed with a thermogravimetric method, comparing the change in chemical composition in the aggregate when set with water, compacted and hardened. It has been show...
متن کاملReactivity and selectivity in aggregate systems
The issue of reactivity and selectivity in aggregates, mainly micelles or vesicles, is here shortly overviewed. The discussion is particularly addressed to reactivity, mainly in aqueous solutions, containing micelles and vesicles made of or containing inert, functionalized, and metal ion complexed surfactant-like substances, from a mechanistic point of view. Selectivity is mainly restricted to ...
متن کاملInvestigation on the effect of slag and limestone powder addition in alkali activated metakaolin
Alkali activated material has recently attracted great attention as an environmentally friendly building material. Generally, it exhibits higher mechanical properties and better durability when compared with Portland cement based materials. In this article, mixed alkali activated systems consisting of N-A-S-H and C-A-S-H hydrated gels were produced, using metakaolin as a dominated starting mate...
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ژورنال
عنوان ژورنال: Magazine of Concrete Research
سال: 1967
ISSN: 0024-9831,1751-763X
DOI: 10.1680/macr.1967.19.59.95