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- Title
Alkali Activity Experimental Analysis of Pebble and Sandstone Aggregate and Comprehensive Properties of Concrete.
- Authors
ZHANG Gui-hua; ZHANG Feng
- Abstract
In order to analyze the alkali-aggregate reaction hazards of natural pebble aggregate and excavated sandstone aggregate to be used in a large-scale water conservancy and hydropower project in Tibet, the alkali activity of aggregates is detected by lithofacies method and accelerated mortar bar method, and the inhibition effect of mixing grade II fly ash is studied. And the comprehensive properties of pebble or sandstone aggregate concrete are also evaluated. The results show that, both pebbles and sandstones are all alkali active aggregates with potential harmful reactions, and contain varying amounts of alkali-silicon reactive components, microcrystalline or cryptocrystalline quartz. The minimum dosages of single-doped grade II fly ash to effectively inhibit the alkali activity of pebble and sandstone are 25% and 30%, respectively. The alkali-silica reaction of pebble or sandstone aggregate can be effectively inhibited by using the strategy of "P⋅O 42.5 cement + 20% grade II fly ash". Both kinds of aggregates can be used to prepare C25W6F200 concrete, which meets the performance requirements.
- Subjects
TIBET (China); FLY ash; WATER conservation projects; SANDSTONE; PEBBLES; ALKALI-aggregate reactions; MORTAR; ALKALIES
- Publication
China Rural Water & Hydropower, 2022, Issue 5, p201
- ISSN
1007-2284
- Publication type
Article