Menene ya kamata a kula da shi lokacin amfani da polycarboxylate superplasticizer don C30 da ƙasa da kankare?

(Me ya kamata a kula da shi lokacin amfani da polycarboxylate superplasticizer don C30 da ƙasa da kankare?)

Polycarboxylate superplasticizer yana da ƙarin fa'idodi fiye da naphthalene na gargajiya da kuma aliphatic superplasticizer a cikin haɗaɗɗen siminti mai ƙarfi mai ƙarfi, amma fa'idodinsa na rage yawan ruwa ba za a iya kawo shi cikin cikakken wasa ba lokacin da ƙarfin bai fi C30 girma ba.

Domin yin polycarboxylate superplasticizer taka rawa mafi kyau a cikin ƙananan ƙarfin siminti, ya kamata a biya hankali ga:

Rage ingantaccen abun ciki na polycarboxylic acid superplasticizer

Mafi girman ingantaccen abun ciki na polycarboxylic acid superplasticizer shine, ƙananan abun ciki na polycarboxylic acid superplasticizer shine. A cikin shirye-shiryen siminti na matsakaici da ƙananan ƙarfi, idan an yi amfani da polycarboxylic acid tare da babban abun ciki mai ƙarfi, abun ciki na admixture sau da yawa ya ragu sosai, nauyin admixture yana ƙaruwa 0.5kg / m ko amfani da ruwa yana ƙaruwa 5kg / m, cakuda kankare zai canza sosai, wani lokacin rabuwa, zub da jini, haɓakawa, har ma da toshe bututu yayin gini, akasin haka, rage yawan amfani da ruwa / 0.5. 5kg/m. A workability na kankare cakuda ne kuma wuya a tabbatar. Saboda haka, lokacin amfani da polycarboxylic acid superplasticizer don shirya matsakaici da ƙananan ƙarfi kankare, yana da kyau a yi amfani da polycarboxylic acid superplasticizer tare da ingantaccen abun ciki na 8% ~ 10% (lokacin da abun ciki ya kasance 1.8%, ana sarrafa ƙimar rage ruwa a kusan 20%). Ƙananan abun ciki mai ƙarfi polycarboxylic acid yana rage yawan haɗewa da yawan ruwa. Lokacin da danshi abun ciki na yashi da tsakuwa ya canza, zai iya yadda ya kamata hana workability na kankare daga canzawa, wanda ya dace da samar da masu sarrafa.

Zaɓi amfani da ruwan da ya dace don tabbatar da ƙarar slurry da ake buƙata

Polycarboxylic acid superplasticizer yana da ƙananan abun ciki (0.15% -0.35%) da yawan raguwar ruwa (raguwar ruwa na iya zama har zuwa 35% ko ma mafi girma a babban abun ciki). Dangane da rage yawan amfani da ruwa, polycarboxylate superplasticizer yana da fa'idodi fiye da naphthalene na gargajiya da kuma aliphatic superplasticizer. Matsakaicin adadin ruwa na matsakaici da ƙananan ƙarfin kankare sau da yawa a kan babban gefe, alal misali, rabon ruwa na C30 shine 0.42-0.45 kuma na C20 shine 0.5-0.55. Idan an rage yawan amfani da ruwa ta hanyar rage yawan ruwa mai yawa, yawan adadin siminti na siminti sau da yawa za a rage, kuma adadin man da aka yi da kanka ba zai isa ba, don haka yana da wuya a kula da kyakkyawan aiki na cakuda kankare da kuma kawo matsaloli ga ginin gine-gine. Sabili da haka, lokacin amfani da polycarboxylate superplasticizer, ya kamata a zaɓi amfani da ruwa mai dacewa don tabbatar da wani adadin ɓangaren litattafan almara, kamar: C30 amfani da ruwa 165-175 kg C20 C20 amfani da ruwa 175-185 kg C15 C15 amfani da ruwa 180 ~ 190kg / m. Lokacin amfani da polycarboxylate superplasticizer don shirya matsakaici da ƙananan ƙarfi kankare, ya kamata a ba da hankali ga zaɓar adadin da ya dace daidai da yawan ruwan da ake amfani da shi, don yin cakuda kankare yana da kyakkyawan aiki. A lokaci guda, ya kamata a biya hankali don daidaita yanayin yashi yadda ya kamata don kula da riƙewar ruwa da ƙarancin ƙarancin ƙarfin siminti.

Kula da daidaitawar jimlar gradation da ɓarna

Abubuwan da ke cikin manna na siminti mai ƙarancin ƙarfi wanda ƙarfin sa ya yi ƙasa da C30 gabaɗaya ƙasa ne. don yin cakudaccen kankare ya sami kyakkyawan aiki, ya kamata a biya hankali ga daidaitawar jimlar gradation don rage yawan ɓarna. Ƙarƙashin ƙaƙƙarfan ɓarna na tarawa, ƙananan manna da aka yi amfani da su don cika rata tsakanin tarawa, kuma mafi girma da manna da aka nannade a kan farfajiyar tarawa, yana da kyau don inganta aikin aikin haɗin gwiwar. Misali, an rage ɓacin rai daga 43% zuwa 38%. Saboda raguwar 50L / m a cikin manna cika ƙaƙƙarfan ɓangarorin siminti na siminti, ƙwanƙolin ƙwanƙwasa yana daidai da ƙara 50L / m, wanda ke haɓaka aikin kankare sosai.

Kula da canjin yashi fineness modulus

Saboda ƙaramin ƙaramin ƙarfin simintin siminti, lokacin da ake amfani da polycarboxylic acid superplasticizer, haɗaɗɗen madaidaicin kankare ba shi da kyau, yakamata a rage girman yashi yadda ya kamata, matsakaicin yashi tare da ƙarancin yashi ƙasa da 0.315 yakamata a zaɓi, kuma abun ciki na 20% yakamata a ba da garanti. Lokacin da ɓarna na jimlar siminti ya yi girma, simintin yakan yi saurin kamuwa da al'amarin slurry gudu da ɗigon dutse, kuma simintin ba shi da haɗin kai. A wannan lokacin, ya kamata a ƙara yawan yashi mai kyau da kyau, kuma lokacin da babu yashi mai kyau don daidaita yanayin yashi mai gauraye, ana iya ƙara yawan yashi da kusan 2%. Don inganta iya aiki. Duk da haka, adadin yashi mai kyau tare da ƙananan ƙwaƙƙwarar ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun yanki bai kamata ya yi girma ba don hana haɓakar ƙayyadaddun yanki na musamman, karuwar buƙatun ruwa da kuma lalacewar ƙwayar kankare. Bugu da kari, lokacin shirya siminti mai matsakaici da ƙarancin ƙarfi, bai dace a yi amfani da yashi mai ƙarfi tare da girman barbashi> 1.18 ba saboda ƙaramin adadin manna. Irin wannan yashi yakamata ya haifar da bambance-bambancen cakudewar kankare, rashin haɗin kai da riƙe ruwa, kuma samarwa yana da wahalar sarrafawa.

Polycarboxylic acid superplasticizer ya kamata a kula da abubuwan da ke tattare da ruwa da abubuwan kauri

Sakamakon slump-retaining polycarboxylate superplasticizer yana da matukar tasiri da abun ciki na polycarboxylic acid superplasticizer a cikin matsakaici da ƙananan ƙarfin kankare wanda siminti ya fi ƙasa da 350kg / m, amma babban adadin polycarboxylate superplasticizer yana da sauƙi don sanya cakuda ya rabu da ruwa mai zubar da jini. Saboda haka, lokacin da kankare cakuda yana da hali na rarrabuwa, iska entraining wakili ko thickener za a iya ƙara zuwa famfo don inganta ruwa rike da cohesion na kankare, da kuma polycarboxylic acid superplasticizer dauke da danko modifier kuma za a iya amfani da.

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(Me ya kamata a kula da shi lokacin amfani da polycarboxylate superplasticizer don C30 da ƙasa da kankare?)