{"id":5714,"date":"2023-11-01T11:47:44","date_gmt":"2023-11-01T10:47:44","guid":{"rendered":"https:\/\/www.labexpin.com\/portfolio-items\/mesure-de-la-teneur-en-humidite-des-mortiers\/"},"modified":"2025-05-11T13:56:12","modified_gmt":"2025-05-11T11:56:12","slug":"mesure-de-la-teneur-en-humidite-des-mortiers","status":"publish","type":"avada_portfolio","link":"https:\/\/www.labexpin.com\/fr\/portfolio-items\/mesure-de-la-teneur-en-humidite-des-mortiers\/","title":{"rendered":"Mesure de la teneur en humidit\u00e9 des mortiers"},"content":{"rendered":"

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Mesure de la teneur en humidit\u00e9 des mortiers<\/h1><\/div>

Pour la mesure de l’humidit\u00e9 dans un mat\u00e9riau solide, la m\u00e9thode pond\u00e9rale \u00e0 effectuer en laboratoire est la m\u00e9thode de r\u00e9f\u00e9rence. Une autre m\u00e9thode d’estimation de l’humidit\u00e9 des murs est l’utilisation de l’hygrom\u00e8tre \u00e0 carbure. Cet instrument permet de mesurer in situ l’humidit\u00e9 pr\u00e9sente dans les mat\u00e9riaux de construction (b\u00e9ton, agr\u00e9gats, mortier) ou assimil\u00e9s, en utilisant la m\u00e9thode de r\u00e9action du carbure de calcium. L’instrument est constitu\u00e9 d’un r\u00e9cipient herm\u00e9tique dans lequelle est plac\u00e9 le mat\u00e9riau, pr\u00e9par\u00e9 et pes\u00e9, avec du carbure de calcium (CaC2).
Le carbure de calcium se combine \u00e0 l’eau, en fonction de l’humidit\u00e9 du mat\u00e9riau pr\u00e9lev\u00e9, pour former de l’ac\u00e9tyl\u00e8ne. La r\u00e9action ayant lieu en milieu ferm\u00e9, l’augmentation de la pression \u00e0 l’int\u00e9rieur du r\u00e9cipient est directement proportionnelle \u00e0 la quantit\u00e9 d’eau qu’il contient initialement. La pression est mesur\u00e9e par un manom\u00e8tre qui, sur une \u00e9chelle gradu\u00e9e, donne directement le pourcentage d’humidit\u00e9 par des relations de corr\u00e9lation. <\/p>\n

Normes techniques de r\u00e9f\u00e9rence: UNI 11121:2004; ASTM D4944-18, AASHTO T217.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

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