The alkaliâsilica reaction (ASR) is a reaction which occurs over time in concrete between the highly alkaline cement paste and reactive non-crystalline (amorphous) silica, which is found in many common aggregates and sufficient moisture.his reaction causes the expansion of the altered aggregate by the formation of a swelling gel of calcium silicate hydrate (C-S-H). This gel increases in volume with water, and exerts an expansive pressure inside the material, causing spalling and loss of strength of the concrete, finally leading to its failure.
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Products that are not an antacid, like Zantac Â® , Pepcid Â® , Prilosec Â® , Prevacid Â® , Nexium Â® , Protonix Â® , Aciphex Â® , or Zegerid Â® take much longer to go to work. This is because they don't work on the acid that is in your stomach right now.They work by reducing the amount of acid your body produces. The longer an antacid stays in the stomach, the longer it works. And having some food in yours stomach may actually prolong an antacids effect.his is because they don't work on the acid that is in your stomach right now. They work by reducing the amount of acid your body produces. The longer an antacid stays in the stomach, the longer it works. And having some food in yours stomach may actually prolong an antacids effect.