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Aggiorna i preferiti del tuo browser e usa semmai la funzione ordinaria di stampa del tuo browser.</div></div><div class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><p>Il <b>test colorimetrico</b> con <a href="/wiki/Fenolftaleina" title="Fenolftaleina">fenolftaleina</a> viene utilizzato per determinare la profondità di <a href="/wiki/Carbonatazione" title="Carbonatazione">carbonatazione</a> di un calcestruzzo indurito.<br /> Normalmente questa prova viene effettuata utilizzando una soluzione all'1% di <a href="/wiki/Fenolftaleina" title="Fenolftaleina">fenolftaleina</a> in <a href="/wiki/Etanolo" title="Etanolo">etanolo</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Modalità_del_test"><span id="Modalit.C3.A0_del_test"></span>Modalità del test</h2></div> <p>La soluzione di fenolftaleina viene spruzzata sulla superficie di calcestruzzo da testare preventivamente messa a nudo mediante la rimozione del conglomerato sovrastante ammalorato.<br /> Nelle zone a pH superiore a 9 (ricche di calce) la soluzione fa assumere alla matrice cementizia una colorazione rossastra tipica della fenolftaleina in ambiente basico, mentre lascia incolori quelle a pH inferiore (calcestruzzo carbonatato).<br /> La prova deve essere effettuata subito dopo la rimozione del calcestruzzo sovrastante in quanto nel tempo lo strato superficiale del conglomerato tende a carbonatarsi a seguito del contatto con la CO<sub>2</sub> presente nell'aria. Il test colorimetrico della fenolftaleina può essere effettuato anche su <a href="/wiki/Prova_su_carote" title="Prova su carote">carote</a> di calcestruzzo prelevate da una membratura, spalmando la soluzione sulla superficie esterna della carota stessa subito dopo il suo prelievo (per evitare la carbonatazione per contatto diretto con l'aria). </p> <div class="mw-heading mw-heading2"><h2 id="Normativa">Normativa</h2></div> <p>UNI EN 13295:2005 - Prodotti e sistemi per la protezione e la riparazione delle strutture di calcestruzzo - Metodi di prova - Determinazione della resistenza alla carbonatazione </p> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2></div> <ul><li><a href="/wiki/Calcestruzzo" title="Calcestruzzo">Calcestruzzo</a></li> <li><a href="/wiki/Cemento_armato" class="mw-redirect" title="Cemento armato">Cemento armato</a></li> <li><a href="/wiki/Clinker" title="Clinker">Clinker</a></li> <li><a href="/wiki/Copriferro" title="Copriferro">Copriferro</a></li> <li><a href="/wiki/Durabilit%C3%A0" title="Durabilità">Durabilità</a></li> <li><a href="/wiki/Calce" title="Calce">Calce</a></li> <li><a href="/wiki/Acque_aggressive" title="Acque aggressive">Acque aggressive</a></li> <li><a href="/wiki/Carbonatazione" title="Carbonatazione">carbonatazione</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2></div> <div id="interProject" class="toccolours" style="display: none; 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