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What is pozzolana reaction?

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What is pozzolanic reaction?
in Engg. Materials by  
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This is a simple acid-base reaction between calcium hydroxide and silicic acid.

Ca(OH)2 + H4SiO4 → Ca2+ + H2SiO42- + 2 H2O → CaH2SiO4 · 2 H2O.The product formed is calicum silica hydrate.(C-S-H).

Pozzolana  reaction mainly occurs in portland cement containing pozzolanas.
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a volcano erupted in foreign country i don't exact name ,people used that vocanic  material it is like a  ash
in cement it enhances the strength of cement, it is like a admixture
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