Cellulose ethers, musamman hydroxypropylmethylcellulose (HPMC) da methylhydroxyethylcellulose (MHEC), an yadu amfani da siminti abu Additives a yi aikace-aikace. An san su da abubuwan riƙe ruwa, waɗannan kayan na iya haɓaka ƙarfin aiki, rheology da ƙarfin haɗin kayan siminti. Duk da haka, tasirin su akan ruwan siminti ba koyaushe yake bayyana ba.
Ruwan siminti yana nufin halayen sinadarai tsakanin ruwa da kayan siminti don samar da samfuran ruwa kamar calcium silicate hydrate (CSH) da calcium hydroxide (Ca (OH)2). Wannan tsari yana da mahimmanci ga haɓaka ƙarfin siminti da ƙarfin aiki.
Ƙarin ethers na cellulose zuwa kayan siminti na iya samun tasiri mai kyau da mummunan tasiri akan tsarin hydration. A gefe guda, aikin riƙewar ruwa na ether cellulose zai iya haɓaka siminti don ci gaba da samun ruwa don amsawa, ta haka yana ƙara sauri da digiri na hydration. Wannan yana rage lokacin saiti, yana haɓaka haɓaka ƙarfi kuma yana haɓaka dukiyoyin siminti.
Cellulose ether kuma zai iya aiki azaman colloid mai karewa don hana haɗuwa da daidaita sassan siminti. Wannan yana haifar da ƙarin daidaituwa da kwanciyar hankali microstructure, wanda ke ƙara haɓaka kayan aikin injiniya da dorewa na kankare.
A gefe guda kuma, yawan amfani da ethers na cellulose na iya haifar da mummunan tasirin ciminti. Saboda ether cellulose wani bangare ne na hydrophobic, yana toshe shigar ruwa cikin kayan gelling, yana haifar da jinkiri ko rashin cika ruwa. Wannan yana haifar da raguwar ƙarfi da dorewa na siminti.
Idan maida hankali na ether cellulose ya yi yawa, zai mamaye sararin samaniya a cikin slurry siminti wanda ya kamata a cika da siminti. A sakamakon haka, jimlar daskararrun abun ciki na slurry zai ragu, yana haifar da raguwar kayan aikin injiniya. Yawan ethers na cellulose na iya aiki a matsayin shamaki, hana hulɗar tsakanin siminti da ruwa, yana kara rage tsarin samar da ruwa.
Yana da mahimmanci don ƙayyade mafi kyawun adadin ether cellulose don amfani da shi don inganta kaddarorin kayan gelled yayin da guje wa duk wani mummunan tasiri akan hydration. Adadin ya dogara da dalilai da yawa, irin su nau'in ether cellulose, abun da ke ciki na siminti, rabon siminti na ruwa da yanayin warkewa.
Cellulose ethers, musamman HPMC da MHEC, na iya samun tasiri mai kyau a kan ciminti hydration, dangane da maida hankali da kuma takamaiman abun da ke ciki na siminti abu. Dole ne a yi la'akari da adadin adadin ether cellulose da aka yi amfani da shi a hankali don cimma abubuwan da ake so ba tare da lalata kaddarorin siminti ba. Tare da amfani mai kyau da ingantawa, ethers cellulose na iya ba da gudummawa ga haɓakar kayan gini mafi ɗorewa, dawwama da dorewa.
Lokacin aikawa: Agusta-23-2023