Superplasticizer (I)

Kwanan Wata: 9 ga Mayu, 2022

(一) Daidaitawarpolycarboxylate superplasticizer da kayan siminti:

A aikace, an gano cewaPolycarboxylate Superplasticizersuna da matsalolin daidaitawa a bayyane ga siminti daban-daban da nau'ikan nau'ikan ma'adinai daban-daban, wani lokacin ma suna da kyau sosai. Daidaitawa tsakanin siminti dapolycarboxylate superplasticizer abubuwa da yawa za su shafa. Kamar su: abubuwan siminti, yanki na musamman, abun ciki na alkali, abun ciki na gypsum da iri duk suna da tasiri akan daidaitawarPolycarboxylate Superplasticizer.

A jikewa batu naPolycarboxylate Superplasticizerdomin siminti daban-daban ya bambanta, raguwar ruwa ya ragu, raguwar asarar siminti yana ƙaruwa, al'amarin "sauran wake" yana bayyana lokacin da simintin ya rasa slurry, da matsalolin zubar jini, daskarewa da rarrabuwa, da wahalar yin famfo. , Mai hankali ga sashi, ba za a iya buɗe siminti ba ko kuma ya wuce kima. Misali, abun ciki napolycarboxylate superplasticizer Domin Siminti yana da kashi 1.8% (mƙarƙarin abun ciki na 10%) don samun yanayi mai gamsarwa, yayin da simintin B yana buƙatar a haɗa shi da 2.2% don samun yanayi mai kyau, wani lokacin kuma da zarar ya wuce 2.2% na kashi, haɗin kankare. yana da saurin zubar jini.

A halin yanzu, dangane da adaptability naPolycarboxylate Superplasticizer, mafita sune kamar haka:

(1) A kan jigon tabbatar da ƙarfin simintin, ta hanyar daidaita yawan yashi, girman girman ma'auni mai girma, da kuma ƙara yawan adadin slurry na tsarin siminti;

(2) Mahaifiyar giya tana haɗuwa da ether lipids kuma an ƙara yawan adadin daidai. Gabaɗaya, ana ba da shawarar cewa ethers da lipids 5: 5 sun sami sakamako mafi kyau, kuma adadin ya kamata a ƙara da 0.2%;

(3) Daidaita ƙara ko canza abubuwan da aka gyara, yi amfani da ma'aikatan da suka haɗa da iska kamar SJ, Degussa DY, kumfa stabilizer AR, K12, ƙara yawan ma'auni na slump-retaining agents, amfani da sodium gluconate, sugar, phosphate, ATMP, citric acid, gyare-gyaren sitaci da sauran abubuwan da aka haɗa, ta amfani da cellulose mai narkewa, xanthan danko, dextrin, wanda aka gyara. mai soluble thickener, ko ƙara "sulfur" ko "alkali" zuwa kankare za a iya inganta;

(4) Canja tsarin kwayoyin halitta na polycarboxylic acid, da daidaita wasu abubuwan da ke cikin tsarin haɗin gwiwar don daidaita ƙarfinsa.

Don admixtures, tasirin ash gardama ya fi girma fiye da na foda. Gabaɗaya, tokar gardawa ta matakin farko tana da kyaun daidaitawa, yayin da tokar kuda ta aji na biyu da ta uku tana da saurin rashin daidaituwa, musamman tokar gardawa ta uku. Lokacin da ingancin ash ba shi da kyau, sakamakon ƙara yawan adadinpolycarboxylate superplasticizera cikin lokaci har yanzu ba za a iya inganta sosai ba. Babban dalilin wannan sabon abu shi ne cewa carbon abun ciki na sakandare da kuma na uku gardama ash tare da mafi girma ƙonewa hasara ne ya fi girma, da kuma adsorption iya aiki na carbon barbashi zuwa admixtures ne babba, game da shi rage adsorption na admixtures zuwa ciminti, shafi Concrete fluidity. Lokacin amfani da ash gardama na digiri na III, ƙara abun ciki na mai rage ruwa na polycarboxylate da fiye da 50%, don cimma ƙimar raguwar ruwa lokacin haxa tokar gardama. A gaban tokar kuda ta yau tare da hadaddun inganci da sassa daban-daban, ya zama dole a karfafa ingancin sarrafa tokar gardawa da karfafa gwajin yayin amfani da su. polycarboxylate superplasticizer.