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         <title>Sono dei materiali, naturali e artificiali, utilizzati nell&#39;edilizia.</title>
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         <title>Vengono classificati in questo modo:</title>
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         <title>Oggi le pietre naturali vengono utilizzate per rivestimenti e pavimentazioni.</title>
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         <title>Possono essere classificate in:                                                                                                                                                                                                                        </title>
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         <description><![CDATA[<div>Rocce eruttive o ignee<br>Rocce sedimentarie<br>Rocce metamorfiche&nbsp;</div>]]></description>
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         <title>Le rocce eruttive o ignee derivano dalla solidificazione della lava.</title>
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         <title>Le rocce sedimentarie sono formate dal deposito di sabbia, calce, riuniti fra loro.</title>
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         <title>Le rocce metamorfiche sono formate dalla trasformazione delle rocce eruttive e di quelle sedimentarie.</title>
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         <title>Alcune rocce vengono utilizzate per la preparazione di laterizi e leganti.</title>
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         <title>I laterizi si ottengono per cottura dell&#39;argilla.                                                                                Sono essenzialmente i mattoni e le tegole.</title>
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         <title>Argilla</title>
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         <title>I laterizi per strutture verticali sono i mattoni pieni, semipieni e forati.</title>
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         <title>I laterizi per coperture sono le tegole piane o marsigliesi, embrici, coppi...</title>
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         <title>I laterizi per pavimentazione e rivestimenti sono le piastrelle.</title>
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         <title>I laterizi speciali vengono utilizzati per cornici e recinzioni...</title>
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         <title>Si ottengono dando una forma alle materie plastiche naturali, con l&#39;aggiunta di altri materiali, impastati con acqua e cotti.</title>
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         <pubDate>2022-02-07 11:09:01 UTC</pubDate>
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         <title></title>
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         <title>Sono classificati in ceramiche a pasta porosa e ceramiche a pasta compatta.</title>
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         <title></title>
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         <title>Ceramiche a pasta porosa.</title>
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         <title>Ceramiche a pasta compatta.</title>
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         <title>Le piastrelle sono ottenute comprimendo della pasta in forme metalliche e dopo l&#39;essiccamento vengono cotte ottenendo il biscotto.</title>
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         <title></title>
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         <title>Le materie prime del vetro sono:</title>
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         <description><![CDATA[<div>Sabbia silicea<br>Soda&nbsp;<br>Calce<br>Coloranti<br>Rottami di vetro da riciclo</div>]]></description>
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         <pubDate>2022-02-12 11:53:52 UTC</pubDate>
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         <title></title>
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         <title></title>
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         <title>La lavorazione artigianale.</title>
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         <description><![CDATA[<div>Viene eseguita da mastri vetrai che tramandano la tecnica di generazione in generazione.</div>]]></description>
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         <title>La lavorazione industriale.</title>
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         <title>La lavorazione del float glass.</title>
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         <description><![CDATA[<div>Il macchinario permette alla massa vitrea di "galleggiare" sullo stagno (metallo) fuso ottenendo una lastra di vetro liscio.</div>]]></description>
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         <title>Il cotto.</title>
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         <title>Le maioliche.</title>
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         <title>Il gres.</title>
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         <title>Il clinker.</title>
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         <title>Sanitari</title>
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         <title>Il legno è il materiale che si ricava dal tronco e dai rami degli alberi.</title>
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         <title>I legnami si distinguono per diverse proprietà:</title>
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         <description><![CDATA[<div>Massa volumica<br>Disegno<br>Durezza<br>Resistenza<br>Flessibilità</div>]]></description>
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         <pubDate>2022-02-19 09:08:41 UTC</pubDate>
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         <title>La sua struttura:</title>
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         <title>Esistono diversi pannelli di legno, con diverse caratteristiche.</title>
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         <pubDate>2022-02-19 09:13:29 UTC</pubDate>
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         <title>I paniforti.</title>
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         <title>I tamburati.</title>
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         <title>I pannelli truciolari.</title>
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         <title>Il legno lamellare.</title>
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